Search Results — 2000 specimen records retrieved (1652 records with coordinates)
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 Please cite data retrieved from this page: Data provided by the participants of the Consortium of California Herbaria (ucjeps.berkeley.edu/cch_archive/).
 Records are made available under the CCH Data Use Terms.

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? Specimen ID Determination * Collector Collection Date Collection Number County Locality Elevation in meters Feedback
  UC1543049  Abies magnifica var. shastensis Donald G. Nelson et. al. 1940-6-8 691 Colusa up to very summit Snow Mountain (w boundary of Colusa County,) Comment
  CDA25791  Abutilon theophrasti G. K. Helmkamp, E. A. Helmkamp 2008-10-14 14263 Colusa Sacramento Valley; Along River Road (generally following the Sacramento River), 8.4 miles north of Colusa. Comment
  UCR201545  Abutilon theophrasti George K. Helmkamp, E. A. Helmkamp 2008-10-14 14263 Colusa Sacramento Valley, along River Road (generally following the Sacramento River), 8.4 miles north of Colusa 17 Comment
  UCD80834  Acer macrophyllum Ellen Dean; G. Harrington, J. Alderson, M. Bibbo, B. Rice 2009-3-25 5291 Colusa BLM Bear Creek (Payne) Ranch, lands to the SW of the jct of Hwys 16 and 20. Canyon to the north of Brophy Canyon. 239 Comment
  CHSC25965  Achillea millefolium L. V. Ritter 1969-4-30 220 Colusa Ca 10 mi sw of Williams, s side of Highway 20. Comment
  JEPS73474  Achillea millefolium L. R. Heckard 1972-7-9 3083 Colusa along trail from Frog Pond to Milk Ranch Frog Pond; Snow Mt. (southern range extension) 1950 Comment
  UC1071729  Achillea millefolium J. Clausen 1939-6-26 1743 -4 Colusa 17 mi w of, (just before entering Lake County) Williams Comment
  UCD82114  Achillea millefolium Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5642 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 839 Comment
  JEPS75875  Achnatherum lemmonii L. R. Heckard 1974-9-11 3946 Colusa e of Foutch Camp; Snow Mt., Trout Creek 1889 Comment
  UCD50713  Achnatherum lemmonii Beecher Crampton 1958-5-19 4799 Colusa 5.8 miles south of Lodoga, Colusa County. Comment
  CHSC32199  Achnatherum occidentale subsp. californicum James D. Jokerst 1980-8-8 1082 Colusa North Coast Ranges. Near Snow Mountain (West). 2133 Comment
  CHSC27825  Achyrachaena mollis K. D. Whitney 1978-4-8 32 Colusa Ca. 0.3 mi w of jct of Hwys 20 and 16, s side of Bear Creek, ca. 18 mi sw of Williams. 321 Comment
  CHSC81215  Achyrachaena mollis Caroline Warren; Jenny Marr, Heidi West, Joyce Lacey-Rickert, Julie 1998-4-14 Colusa Vicinity of Grapevine Creek and Sites-Lodoga Road. 137 Comment
  HSC92503  Achyrachaena mollis S. Morrissette, J. Williams & K. Kopper 1994-4-24 24 Colusa Bear Valley Rd., approx. 1.3 miles south of junction with Brimm Rd. 412 Comment
  CAS-BOT-BC29876  Achyrachaena mollis B. G. Baldwin 1986-4-13 598 Colusa Bear Valley, 7.3 miles north of junction with California State Highway 20 along Bear Valley Road Comment
  CHSC79733  Acmispon brachycarpus L. P. Janeway; B. Castro 2000-5-3 6699 Colusa Vicinity of Antelope Creek and Grapevine Creek. 426 Comment
  UCD163235  Acmispon brachycarpus Craig D. Thomsen 2000-4-28 2250 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 1 mile west of Hwy 20/16 intersection. 345 Comment
  CHSC101628  Acmispon denticulatus David W. Isle; Teal Richards 2002-4-18 1653 Colusa Mendocino National Forest; N of Fouts Springs, S of Chlorinator Building on road to Bathhouse Trail (Snow Mtn.) SE aspect drainage in chamise chamassal site burned during 8/8/01 Trough Fire. Teal Richards-DI Reveg Study Plot. MDB and M. 524 Comment
  UCD66677  Acmispon denticulatus Craig D. Thomsen 2000-5-11 2290 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UCD66709  Acmispon denticulatus Craig D. Thomsen 2001-5-24 2509 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UCD146600  Acmispon grandiflorus G. F. Hrusa 1998-6-19 14638 Colusa North Coast Ranges. Below Fouts Springs on Fouts Springs Road to Stonyford. Immediately below Candy Bucket Spring crossing. 675 Comment
  SEINET957367  Acmispon grandiflorus L. R. Heckard 1969-1 2240 Colusa On 14960 burn. Along Trough Spring Ridge road, 0.2 mile north of its junction with Crackerbox Ridge road (about 6-1/2 air miles southeast of Stonyford). 1128 Comment
  CHSC52808  Acmispon grandiflorus var. grandiflorus L. R. Heckard 1969-5-28 2233 Colusa On road above and west of Fouts Springs. 762 Comment
  UCD104192  Acmispon grandiflorus var. grandiflorus L. R. Heckard 1969-5-29 2240 Colusa Along Trough Spring Ridge road, 0.2 mile north of its junction with Crackerbox Ridge road (about 6 1/2 air miles southeast of Stonyford). 1127 Comment
  SEINET8043935 Image available Acmispon rubriflorus A. Howald 2003-1 2354 Colusa Inner North Coast Ranges: Indian Valley, East Park Reservoir, Catholic Point peninsula, Coppermine Road c. 1.2 miles north of intersection with Ruby King Rd., then c. 0.1 mile east on ranch road. 397 Comment
  UCR261740  Acmispon rubriflorus Ann Howald 2003-6-9 2364 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3 miles north of Lodoga, just north of Eagle Eye camping area 377 Comment
  UCR261742  Acmispon rubriflorus Ann Howald 2003-6-9 2368 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3 miles north of Lodoga, near Hole-in-the-Wall camping area 370 Comment
  UCR261743  Acmispon rubriflorus Ann Howald 2003-6-9 2365 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3 miles north of Lodoga, at Sleepy Hollow camping area 378 Comment
  UCR261745  Acmispon rubriflorus Ann Howald 2003-6-9 2362 A Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3 miles north of Lodoga, near Rocky Ridge camping area 424 Comment
  CHSC112313  Acmispon wrangelianus Lowell Ahart 2013-5-1 18697 Colusa Inner North Coast Range. Near a small drainage, north of the wash and State Highway 20, just east of Lake County Line, 12.2 mile (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  UCD163704  Acmispon wrangelianus Craig Thomsen 1999-5-10 2016 Colusa Bear Valley. About 9 miles north of Hwy 20. Comment
  HSC97663  Acmispon wrangelianus J. Marshall, J. Savage, L. Allison 1997-3-30 11 Colusa Mt. Diablo Meridian, 1.6 mi. E of Brim Rd., Walker Ridge intersection. 457 Comment
  JEPS75833  Aconitum columbianum L. R. Heckard 1974-9-11 3943 Colusa s.e. Foutch Camp (just e. of large rocky outcroppings, Snow Mt.); Snow Mt. 1859 Comment
  CAS-BOT-BC29713  Acroptilon repens F. L. Shanks 1931-10-1 s.n. Colusa Mills Orchard, near Maxwell Comment
  HSC72177  Adenostoma fasciculatum J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9555 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  JEPS44792  Adenostoma fasciculatum Alice King June 1906 Colusa College City Comment
  UC71996  Adenostoma fasciculatum Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  UCD13213  Adenostoma fasciculatum Charles Martin 1986-5-17 27 Colusa Along Sites-Lodoga Road, ca. 8.2 miles W of Sites, on roadside. Comment
  UCD56913  Adiantum jordanii Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3516 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. In Craig Canyon. 318 Comment
  UCR206362  Aegilops triuncialis George K. Helmkamp, E. A. Helmkamp 2009-5-20 14749 Colusa Inner North Coast Ranges, along CA-16 at 'Cowboy Camp' 1.0 mile south of the junction with CA-20, adjacent to Bear Creek 332 Comment
  CDA4021  Aeschynomene rudis June McCaskill, J. Hill 1990-8-27 s.n. Colusa Near Princeton. 0 Comment
  CDA4028  Aeschynomene rudis G. D. Barbe, Daryl Brown 1990-8-29 4392 Colusa West side of Boggs Road between Dodge and Fonseca Roads; 5.6 km southwest of Princeton. 0 Comment
  CDA4030  Aeschynomene rudis G. D. Barbe, June McCaskill 1990-9-5 4397 Colusa West side of Boggs Road between Dodge and Fonseca Roads; 5.6 km southwest of Princeton. 0 Comment
  UCD104591  Aeschynomene rudis June McCaskill; G. D. Barbe 1990-9-5 4397 Colusa West side of Boggs Road Between Dodge and Fonseca roads; 5.6 km southwest of Princeton. Comment
  HSC59124  Aesculus californica Terry Roth 1979-5-7 40 Colusa Where Hwy. 20 enters Salt Canyon along Salt Creek 122 Comment
  JEPS80777  Agastache urticifolia L. R. Heckard and J. C. Hickman 1981-7-30 5750 Colusa Trout Creek trail se side Snow Mt.; se side of Snow Mt. 1615 Comment
  CHSC56745  Agoseris heterophylla Ginger S. Gough 1989-4-1 7 Colusa Ca. 0.48km W of jct of Hwys 20 and 16, S side of Bear Creek, ca. 29km SW of Williams. 322 Comment
  CHSC78591  Agoseris heterophylla J. Marr; H. West, C. Warren, J. Lacey-Rickert, N. Wight 1998-4-14 Colusa Vicinity of Antelope Valley. 121 Comment
  CHSC79649  Agoseris heterophylla L. P. Janeway; B. Castro 2000-5-2 6690 Colusa Vicinity of Grapevine Creek and Sites-Lodoga Road. 225 Comment
  HSC72163  Agoseris heterophylla J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9538 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  UCD56897  Agoseris heterophylla Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3500 Colusa BLM Payne Ranch. On the west side of Hwy. 16. Ca. 2 road miles south of junction of Hwy. 16 and Hwy. 20. 304 Comment
  UCD57283  Agoseris heterophylla Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3651 Colusa BLM Payne Ranch. Mouth of Craig Canyon. Along unimproved road, about 2 road miles south of junction of Hwy 20 and Hwy 16. . 316 Comment
  UCD64502  Agoseris heterophylla Craig D. Thomsen 2000-3-31 2092 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCD66469  Agoseris heterophylla Craig D. Thomsen 2001-4-12 2459 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  UCD82475  Agoseris heterophylla Craig Thomsen; G. Harrington 2009-5-12 2853 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  UCD82508  Agoseris heterophylla Craig Thomsen; G. Harrington 2009-5-12 2867 a Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  OBI49665  Agoseris heterophylla var. cryptopleura A. Liston, M. Blumler 1987-4-26 667 -2 Colusa Bear Valley, Lodoga Rd, 6.6 mi S of Bartlett Springs jct Comment
  POM292576  Agoseris heterophylla var. heterophylla Lyman Benson 1933-4-16 4328 Colusa 5 miles east of Lake County line. Mt. Range: Inner N. Coast; Watershed: N. Fork Cache Creek. 457 Comment
  CHSC94403  Agrostis exarata Lowell Ahart 2006-8-9 13167 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS110433  Agrostis exarata Lowell Ahart 2006-8-9 13167 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  CHSC94280  Agrostis viridis Lowell Ahart 2006-8-9 13111 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  JEPS110386  Agrostis viridis Lowell Ahart 2006-8-9 13159 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  UCD162995  Aira caryophyllea Craig D. Thomsen 2000-4-12 2169 Colusa Bear Creek Botanical Management Area. Roadside shoulder of Hwy 20 (south side), about 0.5 mile west of Hwy 20/16 intersection. 345 Comment
  UCD66472  Aira caryophyllea Craig D. Thomsen 2001-4-24 2476 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  UCR227338  Aira caryophyllea Craig D. Thomsen 2001-4-24 2476 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, south side of Hwy 20, c. 0.25 mi west of Hwy 20/16 intersection, near Colusa Co. milepost 3.0 310 Comment
  SEINET3917542  Aira caryophyllea Donald Spalinger 1974-5-4 47 Colusa St. John Mt. quad. North fork Campground on Stony Creek. 1600.; 0 Comment
  CAS-BOT-BC445318  Alisma lanceolatum Milo S. Baker 1946-9-5 11631 Colusa Along Hiwy. bet. Colusa and Williams Comment
  UC985656  Alisma plantago-aquatica Malcolm A. Nobs and S. Galen Smith 1949-9-9 1873 Colusa 3 mi w Williams Comment
  UCD137979  Alisma triviale June McCaskill; W. A. Harvey 1954-8-9 360 Colusa 2 miles east of Princeton and 300 yards south of Glenn County line. Comment
  CAS-BOT-BC459583  Allium amplectens Katherine Esau 1934-5-5 s.n. Colusa Wilbur Springs Quad., Near Rail Canyon Comment
  CHSC84321  Allium amplectens Lowell Ahart 2003-7-14 10380 Colusa Along a small drainage, field on the south side of Highway 20, about 2 miles southwest of the intersection of Highway 20 and Bear Valley Road, about 21 miles (by road) southwest of Williams. 520 Comment
  UCD138480  Allium amplectens G. L. Stebbins Jr. 1962-5-6 6024 Colusa along Highway No. 20, on south bank of Bear Creek, between Williams and Lower Lake, south of Wilbur Springs. 457 Comment
  UCD163212  Allium amplectens Craig D. Thomsen 2000-4-28 2198 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 0.3 mile west of Hwy 20/16 intersection. 345 Comment
  UCD66451  Allium amplectens Craig D. Thomsen 2000-5-11 2297 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  UCD82863  Allium amplectens Gordon Harrington 2008-4-13 76 Colusa BLM Payne Ranch. Slopes to the SW of junction of Hwy 16 and Hwy 20. E of unnamed creek (flowing now). 349 Comment
  UC1561213  Allium bolanderi Barbara Ertter 1989-7-1 8619 Colusa road to Goat Mt. Lookout 0.4 mi s Rt. M-10 (Bear Creek-Fouts Spring Rd.) (at head of S Fk. Stony Creek, ca. 12 air mi wsw of Stonyford); S. Fk. Stony Creek 1371 Comment
  CHSC70819  Allium falcifolium B. Castro; D. Isle, L. Hanson, B. Corbin, E. Earl, L. Janeway 1995-4-28 565 Colusa On Walker Ridge just W of Walker Ridge Rd, ca 0.5 mi S of jcn of Walker Ridge Rd and Bartlett Springs Rd, ca 300 ft E of Lake Co. line. 716 Comment
  JEPS15563  Allium falcifolium G. Thomas Robbins with L. R. Heckard 1956-7-25 3717 Colusa slope above Dark Hollow Creek (a tributary of Middle Fork Stony Creek) (on s flank of Snow Mt. at lower end of cirque between Snow Mt. West and Snow Mt. East); Snow Mt. 1981 Comment
  UC1613362  Allium falcifolium Charles M. Belshaw April 1937 2865 Colusa vicinity of Cook's Spring (Devil's Ridge); Inner N. Coast Range, Devil's Ridge Comment
  HSC42373  Allium falcifolium Dale McNeal 1975-5-3 1595 Colusa Above Hwy. 20, 1.0 mi. W of junction with Hwy. 16 Comment
  POM174570  Allium falcifolium Roxana S. Ferris 1926-4-23 6570 Colusa Dry Creek near Stonyford. Comment
  UCD141834  Allium falcifolium L. K. Mann 1957-5-30 s.n. Colusa road from Goat Mt. Lookout to Upper Lett's Valley. 1524 Comment
  UCD141855  Allium falcifolium Roman Gankin 1958-4-25 s.n. Colusa 4 miles west of Leesville. Near head of Bear Valley. 304 Comment
  UCD141787  Allium fimbriatum M. Yamaguchi; D. Hughes, D. G. Hunt 1965-4-29 s.n. Colusa Bear Valley Road (sign to Wilbur Springs) past fenced area after leaving junction of California 16 and 20. Comment
  CAS-BOT-BC135885  Allium fimbriatum subsp. purdyi A. A. Heller 1940-5-6 15579 Colusa Summit of the grade on State Highway #20, at the Lake County line. 232 Comment
  CAS-BOT-BC135886  Allium fimbriatum subsp. purdyi James Jokerst 1985-4-5 2204 Colusa Wilbur Springs Quad., near Coyote Peak 456 Comment
  CAS-BOT-BC135888  Allium fimbriatum subsp. purdyi David D. Keck 1933-5-30 2398 Colusa Colusa-Lake County line west of Wilbur Springs. Comment
  CAS-BOT-BC135890  Allium fimbriatum subsp. purdyi David D. Keck 1933-5-30 2398 Colusa Colusa-Lake County line west of Wilbur Springs. Comment
  HSC48164  Allium fimbriatum var. purdyi Thomas W. Nelson, Jane P. Nelson 1978-4-29 3928 Colusa Along Bear Valley Rd., 2 mi. from the junction with State Route 20. 366 Comment
  HSC67119  Allium fimbriatum var. purdyi Dale McNeal 1980-4-26 2318 Colusa Above Bear Valley Rd., 1.4 mi. N of its junction with Hwy. 20 Comment
  POM215800  Allium fimbriatum var. purdyi David D. Keck 1933-5-30 2398 Colusa Colusa/Lake Co. Line west of Wilbur Springs Comment
  RSA32757  Allium fimbriatum var. purdyi A. A. Heller 1940-5-6 s.n. Colusa Summit of the grade on Hwy 20, at the Lake Co. line 232 Comment
  UCD141789  Allium fimbriatum var. purdyi L. K. Mann 1958-5-3 s.n. Colusa Colusa - Lake County: California Highway #20 at county line. Comment
  UCD141858  Allium fimbriatum var. purdyi L. K. Mann 1958-5-3 s.n. Colusa California Highway #20 at Lake County - Colusa County Line. Comment
  UCD57301  Allium fimbriatum var. purdyi Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3672 Colusa BLM Payne Ranch. Lands to the southwest of junction of Hwy. 20 and Hwy. 16. Thompson Canyon, near juncture with Craig Canyon. Above Thompson Creek. 366 Comment
  UCR198144  Allium fimbriatum var. purdyi Ellen Dean, C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3672 Colusa BLM Payne Ranch, lands to the southwest of junction of Hwy 20 and Hwy 16. Thomposon Canyon, near juncture with Craig Canyon, above Thompson Creek 366 Comment
  SEINET3884502  Allium fimbriatum var. purdyi D. W. McNeal 1980-4-26 2318 Colusa On an open slope above Bear Valley Rd., 1.4 mi. n. of its jct. with Hwy #20.; 0 Comment
  SEINET194974  Allium purdyi A. A. Heller 1940-5-6 15579 Colusa Summit of the grade on State Highway # 20 , at the Lake County line, 232 Comment
  CDA11415  Allium serra G. F. Hrusa, K. van Katwyk 1995-4-22 12136 Colusa Inner North Coast Ranges; S side of Leesville Rd. approx. 3 m. N of Hwy 20. Comment
  CHSC42240  Allium serra Curtis Williges 1986-4-5 20 Colusa Hwy 20, 3 mi e of jct Hwy 16. 335 Comment
  CHSC71010  Allium serra Vernon Oswald; Lowell Ahart 1998-5-7 8992 Colusa Lodoga-Leesville Rd. 4.3 mi south of Cooks Springs Rd. 469 Comment
  CHSC77625  Allium serra Heidi West; Jenny Marr, Julie Cunningham 1998-4-15 Colusa Vicinity of Grapevine creek and Sites-Lodoga Road. 146 Comment
  UC630432  Allium serra Annetta Carter 1938-5-7 1373 Colusa 4 mi n Rumsey; Inner North Coast Range, Comanche Hills 243 Comment
  UC766754  Allium serra R. F. Hoover 1938-4-24 3216 Colusa w Arbuckle; Sand Creek foothills Comment
  UCD15595  Allium serra Lisa Montany 1985-4-13 9 Colusa Bear Valley, 8.6 miles north of Wilbur Springs Rd and Hwy 20 intersection. 457 Comment
  JEPS72 Image available Allophyllum gilioides subsp. gilioides W. L. Jepson 1932-5-7 16271 Colusa Lodoga; ; Lodoga, Colusa Co. 518 Comment
  CHSC62939  Allophyllum gilioides subsp. violaceum Vernon H. Oswald; Lowell Ahart 1994-4-6 6060 Colusa Goat Mtn. Rd. at Sullivan Creek, 1.2 mi SW of Digger Pine Flat, S of Stonyford. On slopes bordering Sullivan Creek. 469 Comment
  CHSC88518  Allophyllum gilioides subsp. violaceum B. Castro 2003-5-15 1438 Colusa Vicinity of Logan Ridge, Sulphur Gap and Lurline Creek. On steep SE-facing slope in opening above dirt rd paralleling a S-trending canyon. 195 Comment
  JEPS80795  Alnus incana subsp. tenuifolia L. R. Heckard and J. C. Hickman 1981-7-30 5765 Colusa Trout Creek Snow Mt. (se side of mt.) Comment
  CDA12377  Alnus rhombifolia G. F. Hrusa 1996-1-2 12630 Colusa Inner North Coast Ranges; Little Stony Creek, +/- 2 miles W of intersection of Cedar Camp Rd. and Stonyford-Lodoga Rd. Comment
  CHSC71667  Alopecurus saccatus Michael A. Wolder 1998-5-12 Colusa Sacramento National Wildlife Refuge Complex. Colusa National Wildlife Refuge south west of Colusa. 16 Comment
  CHSC85730  Alopecurus saccatus G. F. Hrusa; K. van Katwyk 1995-4-22 12142 Colusa Inner North Coast Ranges. Along N side of Leesville Rd. approx. 4 m. NW of Hwy. 20. 290 Comment
  CHSC101072  Ambrosia psilostachya David W. Isle; Rhonda Isle 2007-9-9 1624 Colusa Stonyford Park at NW edge of Indian VA Elementary School; about 100 yds SE of Co. Rd 306 Stony Creek Bridge; about 1/4 mile S of Glenn Co. line. Comment
  JEPS108783  Ambrosia psilostachya Lowell Ahart 2006-9-26 13350 Colusa Between the deep ditch and the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell 24 Comment
  JEPS89498  Ambrosia psilostachya Dean W. Taylor 1989-8-6 10510 Colusa s.w. margin Delevan Nat'l Wildlife Refuge; Sacramento Valley, Delevan Nat'l Wildlife Refuge Comment
  RSA718532  Ambrosia psilostachya L. Ahart 2006-10-31 13518 Colusa 20 yards northeast of the bridge across Stony creek, just north of Stonyford. 348 Comment
  RSA78613  Ammannia coccinea J. T. Howell 1944-7-18 19837 Colusa 3 miles west of Williams. 30 Comment
  CHSC94478  Ammannia robusta Lowell Ahart 2006-8-9 13142 Colusa North side and just east of the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS110091  Ammannia robusta Lowell Ahart 2006-8-9 13142 Colusa North side and just east of the bridge across Stony Creek, just north of Stonyford 347 Comment
  CHSC90043  Amsinckia intermedia Craig Fleming 1991-4-6 13 Colusa In Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. 143 Comment
  HSC31598  Amsinckia intermedia Thomas E. Higley 1974-5-5 84 Colusa 0.5 mi. S of N Fork Campground 412 Comment
  SBBG126065  Amsinckia lunaris G. K. Helmkamp with E. A. Helmkamp 2009-3-11 14368 Colusa St Hwy 20, 9.7 mi SW of Williams, on N side of Salt Crk 162 Comment
  UC1093626  Amsinckia lunaris Francia Chisaki, Gene B. Newcomb 1958-4-1 1097 Colusa on road to Lodoga (0.7 mi nw of junction with Hwy 20) Comment
  UC762196  Amsinckia lunaris R. F. Hoover 1938-4-23 3204 Colusa grade on Rumsey-Arbuckle Road Comment
  UCD77237  Amsinckia lunaris Robert E. Preston 2005-4-10 2330 Colusa Ca. 0.9 mi ESE of Wilbur Springs, along Bear Valley Road. 373 Comment
  UCD83661  Amsinckia lunaris Gordon Harrington 2008-4-13 77 Colusa BLM Payne Ranch. Hills SW of junction of Hwy 16 and Hwy 20. W of unnamed creek (flowing now). 388 Comment
  RSA0089732  Amsinckia lunaris B. Castro 2003-3-18 1384 -a Colusa Vicinity of Sites (Offstream Storage Investigation: Sites S. Bridge road route), hills N of the Sites-Lodoga Road, and Stone Corral Creek. 198 Comment
  POM287399  Amsinckia lycopsoides Lyman Benson 1935-3-27 6343 Colusa Williams. 61 Comment
  UC1178228  Amsinckia lycopsoides Peter M. Ray 1950-4-15 1712 Colusa 1.5 mi s Lodoga (road to Leesville) 381 Comment
  UCD160032  Amsinckia lycopsoides Ellen Dean; Craig Thomsen 2015-4-21 8628 Colusa Bear Creek Ranch (previously Payne Ranch) at intersection of highways 16 and 20. Area to the SE of Lynch Canyon on S side of undeveloped road and N of creek. Near western end of Thompson Canyon. 381 Comment
  UCD67070  Amsinckia menziesii Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5098 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western part of ranch along ridge trail at Cache Creek Canyon. Just south of junction with trail that leads east to Brophy Canyon and Thompson Creek. 494 Comment
  UCR233359  Amsinckia menziesii var. menziesii George K. Helmkamp, E. A. Helmkamp 2011-4-1 17116 Colusa Western Sacramento Valley, along Maxwell Road, 2.1 miles east of Maxwell, near Delevan Wildlife Refuge 23 Comment
  UC78236  Amsinckia tessellata var. gloriosa K. Brandegee May 1884 Colusa Mountain House; North Coast Ranges Comment
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Jun 20 2007
  SEINET7075569  Ancistrocarphus filagineus A. G. Vestal 1955-4-5 s.n. Colusa In mountains [Cortina Ridge] west of Williams on Route 20 at Salt Canyon. 39? deg. 6' 22" North Latitude, -122? deg. 19' 15" West Longitude. UTM Zone 10, 558719mE, 4328566mN. (NAD 27)]. [Coordinate Datum: WGS84/NAD83]. Comment
  UCD56923  Ancistrocarphus filagineus Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3526 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Near headwaters of Craig Canyon. 359 Comment
  UCD64285  Ancistrocarphus filagineus Craig D. Thomsen 2000-3-31 2118 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  RSA256677  Ancistrocarphus filagineus J. L. Hobson 1974-5-4 63 Colusa 0.75 mile from the junction to Indian Valley on Walker Ridge Road. 854 Comment
  CHSC76775  Androsace elongata subsp. acuta J. Marr; B. Hendrickson 1999-3-30 Colusa About 11 air miles W of Willows, vicinity of Squaw Flat and Logan Creek. 152 Comment
  CDA16107  Angelica tomentosa G. F. Hrusa, Dmitri Geltman (LE) 1999-8-18 15246 Colusa North Coast Ranges; Little Stony Creek, approx. 1.5 mi. NE of Stonyford-Lodoga Rd. intersection. Sheet 1 of 2 350 Comment
  CAS-BOT-BC69129  Antennaria geyeri G. Thomas Robbins; L. R. Heckard 1956-7-25 3722 Colusa At summit of Snow Mt. West 2145 Comment
  JEPS80201  Anthemis cotula L. R. Heckard and J. Hickman 1980-7-3 5356 Colusa around Summit Springs; Snow Mt. (sw flank) 1548 Comment
  UCD163218  Anthemis cotula Craig D. Thomsen 2000-5-11 2325 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 0.3 mile west of Hwy 20/16 intersection. 345 Comment
  UCD66932  Anthemis cotula Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5081 Colusa BLM Payne Ranch. Lands to the SW of jct of Hwys 16 and 20. Northwestern part of ranch, along ridge trail on border of Lake and Colusa Counties. South of junction with trail that heads down to the headwaters of Thompson Creek. 633 Comment
  CHSC101033  Anthriscus caucalis John Dittes 2008-3-14 1514 Colusa Great Central Valley; Sacramento Valley; between Butte Sink and Sacramento River, north of Sutter Buttes; ca. 1.6 air mile south of Gridley Road, ca. 1.1 air mile west of Drumheller Slough; 17 Comment
  UCD163652  Antirrhinum cornutum Craig Thomsen 1998-6-10 1950 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  CHSC94883  Antirrhinum subcordatum Lowell Ahart 2006-6-11 12673 Colusa On the west side of an off road trail (Trail 30), about 50 yards south of Fouts Road, about 5 miles (by road) west of Stonyford. 613 Comment
  CHSC111700  Antirrhinum subcordatum David Isle; F. Thomas Griggs 1979-5-23 2064 Colusa Little Stony Creek Watershed. 1/5 mile W of Goat Mtn. Rd/Lodoga Rd. Jct. on N side of Goat Mtn. Rd. Near I-7 fire pre-attack triangular sign on T-post. (Just past Ruby King Mine and small eph. drainage that joins Little Stony Creek from N. 414 Comment
  UCD66699  Antirrhinum vexillocalyculatum Craig D. Thomsen 2000-6-23 2406 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  UCD70222  Antirrhinum vexillocalyculatum D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. 370 Comment
  CHSC115753  Antirrhinum virga David Isle 2015-6-20 2155 Colusa 10S -0533810E, 435732N . North Coast Range: 3.75 miles W of Stonyford and 100 yds S of road 8N01; S of Bob Angulo mobile home; on E edge of old 4x4 road/firebreak in chaparral. 427 Comment
  UCD162982  Aphanes occidentalis Craig D. Thomsen 2002-2-7 2569 Colusa Bear Creek Botanical Management Area. Roadside shoulder of Hwy 20 (south side), about 0.3 mile west of Hwy 20/16 intersection. 345 Comment
  UCD64506  Aphanes occidentalis Craig D. Thomsen 2000-3-31 2093 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  CHSC62836  Apiastrum angustifolium Vernon H. Oswald; Lowell Ahart 1994-3-23 6017 Colusa Goat Mtn. Rd. just W of the bridge over Sullivan Creek, S of Stonyford. 505 Comment
  JEPS87724  Apiastrum angustifolium Vernon H. Oswald and Lowell Ahart 1994-3-23 6017 Colusa just w of bridge over Sullivan Creek (s of Stonyford, Goat Mountain Road); Goat Mountain Road 505 Comment
  UCD82387  Apiastrum angustifolium Craig Thomsen; G. Harrington 2009-5-12 2830 b Colusa Colusa County. Walker Ridge. South of spur road en route to Eaton Springs, about 1/2 mile east of Walker Ridge Rd. About 200 yds south of road (ravine with spring below). 822 Comment
  CHSC86964  Apocynum cannabinum B. Castro; Michelle Cedarborg 2003-5-1 1426 Colusa Vicinity of Logan Ridge, Sites Peak and Lurline Creek. By creek not far downstream of pond at creek headwaters 204 Comment
  SEINET8731045 Image available Apocynum cannabinum Helen K. Sharsmith 1953-1 4263 Colusa Raw serpentine, near confluence of North and Middle forks of Stoney Creek, Red Bride Camp, Mendocino National Forest 549 Comment
  JEPS82549  Arabis glabra var. glabra L. R. Heckard 1983-7-27 6110 Colusa ca. 1/4 mi. w. Summit Springs (s. side Snow Mt.); Snow Mt. 1500 Comment
  JEPS80780  Arceuthobium abietinum L. R. Heckard and J. C. Hickman 1981-7-30 5753 Colusa se side of Snow Mountain, Trout Creek Trout Creek; Snow Mountain, Trout Creek 1600 Comment
  SEINET3239841  Arceuthobium occidentale R. L. Mathiasen 2009-1 2009 -21 Colusa 3.2 km E of Summit County line at vista point on St. Rte. 20. 400 Comment
  UCR225254B  Arceuthobium occidentale Ellen Dean, Gordon Harrington, J. Anderson, E. Bayon, R. Willmarth 2008-6-8 5079 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20. Western part of ranch, several hundred feet downslope of ridge trail, along trail that starts along ridge bordering Thompson Creek headwaters and loops back to ridge trail Comment
  JEPS81346  Arctostaphylos L. R. Heckard and J. C. Hickman 1982-7-6 5943 Colusa about 1/2 mi ne Summit Springs (e of trail, s side of mt.); Snow Mt. 1645 Comment
  SEINET11989661  Arctostaphylos canescens R. A. DeMartile 1982-1 s.n. Colusa 10 mi from Ladoga on road between Ladoga & Goat Mountain lookout 701 Comment
  CAS-BOT-BC25252  Arctostaphylos canescens subsp. canescens Roxana S. Ferris 1917-4-14 595 Colusa 5 mi. W of Arbuckle along Sand Creek Comment
  UC1051740  Arctostaphylos canescens subsp. canescens Helen K. Sharsmith 1953-6-20 4296 Colusa n slope Goat Mountain; Inner North Coast Ranges, Mendocino National Forest 1828 Comment
  JEPS117095  Arctostaphylos canescens subsp. sonomensis Peter Warner 2010-5-16 153 Colusa Walker Ridge Road, ~18.4 km N of jct. with Hwy. 20, along E (Colusa Co.) side of road, scattered on slopes above Zimory Canyon to the west, Trout Creek to east, and adjacent slopes on both sides of road Comment
  UCD66956  Arctostaphylos canescens subsp. sonomensis Ellen Dean; Davis Botanical Society 2008-5-31 5000 Colusa west of I-5 at Maxwell, east slope of Goat Mountain, along Goat Mountain Road. 822 Comment
  CAS-BOT-BC38981  Arctostaphylos malloryi P. C. Everett; E. K. Balls 1954-10-17 20335 Colusa 2 mi. SW of Trough Springs on road to Upper Lake from Stonyford Comment
  CHSC31970  Arctostaphylos manzanita L. Ahart 1976-2-14 1002 Colusa Ca. 3 mi W of sites. 365 Comment
  HSC67141  Arctostaphylos manzanita J. P. Smith, Thomas W. Nelson 1976-4-14 8587 Colusa Mendocino National Forest, confluence of Stony Creek and N Fork of Stony Creek. 427 Comment
  SDSU1508  Arctostaphylos manzanita D. F. Howe 1962-5-19 3285 Colusa 11 miles west of Willams on #20. 152 Comment
  UCD67000  Arctostaphylos manzanita Craig D. Thomsen; Gordon Harrington 2008-7-6 2781 -c Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western side of ranch along trail that follows the border of Lake and Colusa counties. South of Dunsfield Flat, along ridge trail above Cache Creek Canyon. 640 Comment
  CHSC79496  Arctostaphylos manzanita subsp. elegans L. P. Janeway 2000-5-31 6773 Colusa Inner North Coast Ranges. On top of Hornet Nest Ridge, between Hornet Nest Spring and Hornet Nest Hill; about 6.4 km southwest of Stonyford. 884 Comment
  IRVC29624  Arctostaphylos nevadensis Mark A. Elvin, Mark S. Brunell, David Isle 2006-8-3 5022 Colusa Snow Mtn; Summit Spring Trail; 1.4km W of Snow Mtn West summit; 800m N of Cedar Camp. Southern Northern Inner Coast Ranges 1989 Comment
  JEPS80051  Arctostaphylos nevadensis L. R. Heckard with J. Hickman 1979-6-15 5051 Colusa east trail from Frog Pond to cirque of east and west peaks (ne slope of West Peak ridge); Snow Mt. 1981 Comment
  SFV8791  Arctostaphylos viscida S. C. Schank 1960-4-10 51 Colusa Above Cache Creek, 2 miles northwest of junction of Highway 16 and Highway 20 on road to Bear Valley. Comment
  UCD52647  Arctostaphylos viscida Roman Gankin 1958-4-26 292 Colusa In Leesville-Bartlett Springs road, ca. 2 miles west of junction of this road and Leesville-Wilbur Springs road, near Colusa-Lake County line, California. Comment
  UCD66999  Arctostaphylos viscida Craig D. Thomsen; Gordon Harrington 2008-7-6 2781 -a Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western side of ranch along trail that follows the border of Lake and Colusa counties. South of Dunsfield Flat, along ridge trail above Cache Creek Canyon. 640 Comment
  HSC62937  Arctostaphylos viscida Michael Dalke 1979-4-14 45 .5 Colusa 1067 Comment
  SBBG118100  Arctostaphylos viscida subsp. pulchella C. Bornstein, E. Collins, R. Lutsko 2004-6-18 Colusa Bartlett Springs Rd, ca. 1.3 mi E of jct with Bear Valley Rd 432 Comment
  UCD56680  Arctostaphylos viscida subsp. pulchella Jack Alderson 2007-3-25 s.n. Colusa BLM Payne Ranch. Destinella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 570 Comment
  UCD63712  Arctostaphylos viscida subsp. pulchella Craig D. Thomsen 2008-3-21 2721 Colusa BLM Payne Ranch. In narrow canyon just south of Hwy 20 (at Colusa Co. milepost 2.63), 0.5 mile west of intersection of Hwy 16 and Hwy 20. Comment
  SEINET5731548 Image available Arctostaphylos viscida subsp. pulchella Bruce Hartsough 1973-1 17 Colusa 7 mi. N of Hwy 20 on Walker Ridge Rd. 853 Comment
  SBBG50847  Arctostaphylos viscida subsp. viscida S. C. Schank 1960-4-10 51 Colusa above Cache Crk, 2 mi NW of jct of Hwy 16 and Hwy 20 on rd to Bear Valley Comment
  POM367485  Arctostaphylos viscida subsp. viscida Phyllis Krieg 1979-4-14 s.n. Colusa [Unspecified] 1067 Comment
  UCD82129  Argemone munita Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5659 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 839 Comment
  UCD95197  Argemone munita K. Esau 1934-5-5 s.n. Colusa above Williams, Tahoe-Ukiah Highway. Comment
  SEINET3296895 Image available Argemone platyceras var. hispida L. Constance 1939-5-14 2490 Colusa 1 mile east of Mill Creek Ranger Station, Inner North Coast Ranges. 549 Comment
  UCD56862  Aristida ternipes var. gentilis Beecher Crampton 1958-5-19 4789 Colusa 10.7 miles southeast of Leesville. Comment
  CAS-BOT-BC400400  Aristolochia californica Roxana S. Ferris 1917-4-15 615 Colusa Sycamore Slough Comment
  UCD146598  Arnica discoidea G. F. Hrusa 1998-6-19 14615 Colusa North Coast Ranges. USFS Pacific Ridge Road, 4-5 km northwest of intersecion with Colus County Goat Mountain Road. 1200 Comment
  IRVC29848  Artemisia douglasiana Mark A. Elvin, David Isle, Mark S. Brunell 2006-8-3 4994 Colusa Mendocino Nat. Forest; E face of Snow Mtn., Stony Creek along M10. Southern Northern Inner Coast Ranges 610 Comment
  CHSC32203  Asclepias fascicularis James Jokerst 1980-8-7 1072 Colusa North Coast Ranges. Near Snow Mountain (east). Comment
  CAS-BOT-BC222852  Asclepias solanoana Volney Rattan 1884-6-1 s.n. Colusa Above Fonts Springs, Colusa, Coast Mts. North of San Francisco Bay Comment
  HSC72214  Asclepias solanoana Thomas W. Nelson, Jane P. Nelson 1980-6-24 5876 Colusa Along road to Snow Mtn. trail head at Summit Springs 1585 Comment
  CHSC62834  Aspidotis densa Vernon H. Oswald; Lowell Ahart 1994-3-23 6014 Colusa Frenzel Creek Research Natural Area on the S side of Little Stony Creek, in the section on the E side of Frenzel Creek, S of Stonyford. 518 Comment
  UC1049537  Astragalus breweri Rimo Bacigalupi 1950-4-16 3112 Colusa four mi s Ladoga (6 mi nnw of Leesville, in Indian Valley (not the one in Lake County) along Little Indian Creek, eastern base of Inner North Coast Ranges); eastern base Inner North Coast Ranges, Little Indian Creek 396 Comment
  UCD163230  Astragalus clevelandii Craig D. Thomsen 2001-5-24 2535 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 1 mile west of Hwy 20/16 intersection. 345 Comment
  CDA11399  Astragalus gambelianus G. F. Hrusa, K. van Katwyk 1995-4-22 12119 Colusa Inner North Coast Ranges; Walker Ridge Road, approx. 6 m. S of intersection with Bartlett Springs Rd. Comment
  CHSC101594  Astragalus gambelianus David W. Isle 2002-4-18 1659 Colusa Mendocino National Forest; N of Fouts Springs, N of Chlorinator Building and road to Bathhouse Trail (Snow Mtn). MDB and M. 524 Comment
  HSC72171  Astragalus gambelianus Thomas W. Nelson, Jane P. Nelson 1978-4-2 9548 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  UCD104819  Astragalus gambelianus J. M. Tucker 1958-3-7 3363 Colusa State Highway 16, Cache Creek Canyon, 0.1 mile north of Yolo-Colusa County line. Comment
  CAS-BOT-BC193115  Astragalus rattanii var. jepsonianus Alice Eastwood; John Thomas Howell 1938-5-16 5634 Colusa Lake - Colusa Co. line on road to Williams Comment
  CHSC112270  Astragalus rattanii var. jepsonianus Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18634 Colusa Inner North Coast Range. North side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  CHSC29256  Astragalus rattanii var. jepsonianus John Steiner 1977-4-16 46 Colusa Growing in an open field, ca. 0.5 km w of jct. of Hwys 20 and 16, s side of Bear Creek, ca. 30 km sw of Williams. 322 Comment
  RSA475188  Astragalus rattanii var. jepsonianus Aaron Liston 1988-3-16 701 -1 Colusa 0.45 miles from jct. Hwy 20 on Walker Ridge road. 600 Comment
  UCD105309  Astragalus rattanii var. jepsonianus J. M. Tucker 1978-5-6 4406 Colusa On east side of Bear Valley Road, flat valley floor of Bear Valley. 10.6 miles (by road) north of junction with State Highway 20. 365 Comment
  UCD163326  Astragalus rattanii var. jepsonianus Craig D. Thomsen 2009-5-3 2791 Colusa Walker Ridge. Vicinity of Walker Ridge Rd., 0.25 miles north of Hwy 20. Comment
  UCD169731  Astragalus rattanii var. jepsonianus Richard R. Halse 2013-3-27 8764 Colusa Along State Hwy. 20 just east of the Colusa/Lake County Line, ca. 14.6 miles east of the junction of State Hwys. 20 and 53. 558 Comment
  UCD56917  Astragalus rattanii var. jepsonianus Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3520 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. In Craig Canyon. 334 Comment
  UCD63037  Astragalus rattanii var. jepsonianus Ellen Dean; Marjorie Phan and Gerald Dickinson 2008-4-27 4883 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Along unnamed tributary of Bear Creek. 322 Comment
  UCD63923  Astragalus rattanii var. jepsonianus Craig D. Thomsen 2002-2-27 2576 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCD81236  Astragalus rattanii var. jepsonianus Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5400 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Edge of Bear Creek, near mouth of canyon located to the south of Brophy Canyon. 224 Comment
  SEINET4680474  Astragalus rattanii var. jepsonianus D. W. McNeal 1988-3-31 3237 Colusa On a hillside above Bear Valley Rd., 0.6 mi NW of Hwy #20.; 0 Comment
  RSA0003126  Astragalus tener var. ferrisiae Roxana S. Ferris 1926-4-21 6281 Colusa 3 mi W of Colusa.. Comment
  JEPS80461  Athyrium filix-femina var. cyclosorum Alice Q. Howard 1972-7-10 Colusa trail from Fouts Camp to Box Springs (n side of ridge seaprating Trout and Paradise Creeks); Snow Mt 1676 Comment
  JEPS53214  Athysanus pusillus W. L. Jepson 16277 Colusa Lodoga, in Coast Range foothills, w Colusa County Lodoga; Coast Range foothills, Lodoga 457 Comment
  CAS-BOT-BC17403  Athysanus pusillus Volney Rattan 1884-1-1 s.n. Colusa Unspecified. Comment
  CAS-BOT-BC170615  Atriplex argentea Roxana Stinchfield 1916-7-1 462 Colusa Colusa - Williams Road, at bridge over the Trough Comment
  UCD21581  Atriplex argentea var. expansa Craig D. Thomsen 2002-11-14 s.n. Colusa BLM Payne Ranch. Along Hwy 20 about a quarter mile west of Hwy 16. Steep eroding slope. Serpentine derived soil. Comment
  UC1609126  Atriplex coronata Vernon H. Oswald, Mike Wolder and Joe Silveira 1993-7-26 5701 Colusa ca 5 mi s Colusa (ca 1 mi n of Ware Rd., ca 1 mi w of Ohm Rd., Tract 18 on the s side of the Colusa National Wildlife Refuge); s side Colusa National Wildlife Refuge, s of Colusa 15 Comment
  CHSC107968  Atriplex depressa B. Castro; Amy Lyons 2011-8-3 1900 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; approximately I mi southeast of Funks Reservoir and 800 ft northeast of Tehama-Colusa Canal. At SW end of N-trending swale, off northwest corner of large +- alkaline marsh. 49 Comment
  CHSC107934  Atriplex fruticulosa B. Castro; L. Janeway 2011-7-9 1895 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; approximately 1 mi southeast of Funks Reservoir and 0.2 mi northeast of Tehama-Colusa Canal. In swale about 300 ft north of large +- alkaline marsh. At edge of swale near star-thistle thicket. 49 Comment
  CHSC79494  Atriplex fruticulosa L. P. Janeway; B. Castro 2000-3-23 6637 A Colusa Vicinity of Funks Creek and Glenn-Colusa Canal. 47 Comment
  CHSC80184  Atriplex joaquinana B. Castro; G. Kuenster 2000-7-19 1210 Colusa Vicinity of Maxwell, Funks Creek, and the Glenn-Colusa canal, on low terrace beside S edge of shallow ephmeral stream channel draining eastward out of the hills east of Golden Gate. 54 Comment
  JEPS100804  Atriplex persistens Dean W. Taylor 1993-7-9 13853 Colusa 300 m S of Sacramento National Wildlife Refuge headquarters; Sacramento National Wildlife Refuge 30 Comment
  UC205343  Atriplex persistens H. M. Hall 1920-7-12 11012 Colusa w Princeton; w of Princeton Comment
  JEPS108753  Atriplex prostrata Lowell Ahart 2006-9-26 13347 Colusa Along the deep ditch, south side of the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell 24 Comment
  JEPS90637  Atriplex rosea Dean W. Taylor 1989-8-4 10422 Colusa Colusa National Wildlife Refuge Great Central Valley (along Ohm Rd., along ditchbank) 39 Comment
  UC217003  Atriplex serenana var. serenana H. M. Hall 1920-7-12 11011 Colusa 5 mi e Maxwell; e of Maxwell Comment
  UCD82112  Avena fatua Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5640 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 839 Comment
  CHSC96926  Azolla filiculoides Lowell Ahart 2007-7-7 14260 Colusa On north side of the Gridley Colusa Highway, about 1 1/4 miles east of River Road, about 17 miles west of Gridley. 20 Comment
  RSA726847  Azolla filiculoides Lowell A. Ahart 2007-7-7 14260 Colusa About 1.25 miles east of River Road, about 17 miles west of Gridley. 20 Comment
  UCR201551  Baccharis pilularis George K. Helmkamp, E. A. Helmkamp 2008-10-14 14260 Colusa Sacramento Valley, along River Road (generally following the Sacramento River), 1.1 miles north of Colusa 18 Comment
  CHSC98782  Baccharis salicifolia Richard R. Halse 2007-3-25 7134 Colusa Along State Hwy. 20 ca. 7.8 miles northeast of its junction with State Hwy. 16, at base of Salt Canyon. Along Salt Creek. 100 Comment
  HSC79084  Baccharis salicifolia C. G. Phillips, L. Cole, S. A. Haultain, K. B. Barrows 1984-4-29 30 Colusa Mendocino National Forest, Digger Pine Campground, 10 miles SW of Stonyford via Lodoga-Stonyford and Goat Mtn. Rd. 457 Comment
  RSA730229  Baccharis salicifolia R. R. Halse 2007-3-25 7134 Colusa Along State Hwy. 20 ca. 7.8 miles northeast of its junction with State Hwy. 16, at base of Salt Canyon. 100 Comment
  CAS-BOT-BC100066  Balsamorhiza macrolepis James Jokerst 1985-4-5 2210 Colusa Wilbur Springs Quad. Near Coyote Peak 456 Comment
  CAS-BOT-BC100068  Balsamorhiza macrolepis G. L. Stebbins 1971-6-6 8016 Colusa Walker Ridge, 1/4 mi. south of road from Leesville to Indian Valley 701 Comment
  OBI54577  Balsamorhiza macrolepis var. macrolepis B. Castro, B. Corbin, K Earll, L. Hanson, D. Isle, L. P. Janeway 1995-4-28 564 Colusa Ca. 18 air mi due W of Williams, on Walker ridge just W of Walker Ridge rd., ca 0.5 mi S of jctn Bartlett Springs rd and Walker ridge Rd. (Site is a few hundred feet E of Lake co line.) 716 Comment
  UCD82618  Balsamorhiza macrolepis var. macrolepis Craig Thomsen; G. Harrington 2009-5-12 2887 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. Southeast side of Eaton Springs complex. 710 Comment
  UC1191425  Bassia hyssopifolia Herbert L. Mason 1946-8-6 12958 Colusa pond on Colusa-Marysville Highway four mi s Colusa (w side of Sacramento River); w side of Sacramento River Comment
  CHSC85963  Bellardia trixago Jenny Marr; Heidi West, Joyce Lacey-Rickert, Caroline Warren 1998-5-8 Colusa Vicinity of Sites and Antelope Valley. 137 Comment
  UC1563953  Bergia texana Barbara Ertter, Elizabeth Neese, Laura Fujii, Dawn Espindola 1989-10-21 8869 Colusa SE end of East park Reservoir N of Lodoga Comment
  JEPS108781  Bidens frondosa Lowell Ahart 2006-9-26 13344 Colusa Along the deep ditch, south side of the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell Comment
  RSA724819  Bidens frondosa L. Ahart 2006-9-26 13344 Colusa South side of the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5.5 miles east of Maxwell. 24 Comment
  CAS-BOT-BC100260  Blennosperma nanum var. nanum Roxana S. Ferris 1917-4-12 498 Colusa 4 miles East of Williams Comment
  JEPS73458  Boechera platysperma L. R. Heckard 1972-7-8 3062 Colusa saddle between East Peak and West Peak; Snow Mt. 1981 Comment
  JEPS80111  Boechera platysperma L. R. Heckard with J. Hickman 1980-7-1 5270 Colusa ca 10 mi w Stonyford (cirque between West and East Peaks; Colusa-Lake County line); Snow Mt. 1950 Comment
  JEPS15548  Boechera repanda G. Thomas Robbins with L. R. Heckard 1956-7-25 3705 Colusa along trail due s Snow Mt. East (and skirting the e base of the ridge forming Snow Mt. West); Snow Mt. West 1981 Comment
  CHSC117122  Boehmeria cylindrica B. Castro; Tom Boullion 2009-9-29 1800 G-2 Colusa Sacramento Valley. Ca 8 air mi SE of Colusa, via Buster Rd. off Hwy 45, just W of Ogden Bend on W bank of the Sacramento River at RM 130.8. 17 Comment
  RSA0105548  Boehmeria cylindrica B. Castro, Tom Boullion 2009-9-29 1800 G-2 Colusa Sacramento Valley. Ca 8 air mi SE of Colusa, via Buster Rd off Hwy 45, just W of Ogden Bend on W bank of the Sacramento River at RM 130.8. 17 Comment
  SEINET8354595  Bolboschoenus fluviatilis David B. Marshall 1954-7-20 Colusa Colusa National Wildlife Refuge. Comment
  CHSC101402  Bolboschoenus glaucus David Isle 2006-5-16 1573 Colusa From bank of irrigation canal west of Maxwell cardlock gas station (south end of Maxwell just W of Hwy 99W). On east edge of canal at west end of Jack Barrett's 4th rice check (counting from N to S). 30 Comment
  CHSC82037  Bolboschoenus glaucus L. P. Janeway 2001-6-13 7172 Colusa Sacramento Valley. Along Norman Road 5.0 km east of Hwy 99W and Hwy I-5. 23 Comment
  CAS-BOT-BC75491  Bolboschoenus glaucus B. Crampton 1953-4-29 1149 Colusa 4 miles east of Norman. Comment
  UCD67058  Bolboschoenus maritimus subsp. paludosus Craig D. Thomsen 2008-5-23 2755 Colusa BLM Payne Ranch. Destanella Flat, just south of Hwy 20, 2.5 miles west of Hwy 16. 522 Comment
  UCD140026  Bolboschoenus maritimus subsp. paludosus P. B. Kennedy 30-31 May 1922 s.n. Colusa Near Cortina. Comment
  CAS-BOT-BC418409  Boykinia occidentalis Volney Rattan 1877-6-26 s.n. Colusa Sulphur Creek Comment
  UCD61436  Brassica nigra Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3881 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1000 ft NNW of parking lot. 314 Comment
  UCR206539  Brassica rapa George K. Helmkamp, E. A. Helmkamp 2009-1-31 14313 Colusa Sacramento Valley, junction of Moon Bend Road and CA-20 at the south end of the city of Colusa 23 Comment
  CAS-BOT-BC106348  Brickellia californica A. J. Bassinger 1927-10-29 s.n. Colusa Sand Creek, Coast Range Comment
  CHSC94321  Brickellia californica Lowell Ahart 2006-8-9 13110 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 422 Comment
  UCD55472  Brickellia californica Ellen Dean; Gordon Harrington 2006-10-6 3296 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 362 Comment
  CHSC32208  Brickellia greenei James Jokerst 1980-8-7 1066 Colusa North Coast Ranges. Near Snow Mountain (West). Comment
  IRVC29684  Brickellia greenei Mark A. Elvin, Mark S. Brunell, David Isle 2006-8-3 5034 Colusa Snow Mtn; Summit Spring Trail; 1.4km W of Snow Mtn West summit; 800m N of Cedar Camp. Southern Northern Inner Coast Ranges 1989 Comment
  JEPS75869  Brickellia greenei L. R. Heckard 1974-9-10 3879 Colusa along e trail, se of saddle between peaks Circle Trail 2011 Comment
  UCR206363  Brodiaea elegans George K. Helmkamp, E. A. Helmkamp 2009-5-20 14747 Colusa Inner North Coast Ranges, along CA-16 at 'Cowboy Camp' 1.0 mile south of the junction with CA-20, adjacent to Bear Creek 332 Comment
  CHSC89838  Brodiaea elegans subsp. elegans B. Castro; L. Janeway 2001-5-10 1248 A Colusa Vicinity of Grapevine Creek, Antelope Creek, and Pence Mtn. Near dirt road paralleling N-S-trending perennial creek, just down from the blue oak-grassland edge. 396 Comment
  JEPS7632  Brodiaea elegans subsp. elegans W. L. Jepson 1920-5-23 8961 Colusa foothills near Mountain House (sw Colusa Co.); Venado Comment
  CAS-BOT-BC482891  Brodiaea elegans subsp. elegans Roxana Stinchfield 1916-6-18 300 Colusa near College City Comment
  CHSC112309  Bromus arenarius Lowell Ahart 2013-5-1 18685 Colusa Inner North Coast Range. In a small drainage, north of the wash and State Highway 20, just east of Lake County Line, 12.2 mile (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  RSA724892  Bromus arenarius L. Ahart 2006-8-22 13216 Colusa south side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford. 349 Comment
  SBBG115860  Bromus arenarius B. Crampton 1958-5-19 4793 Colusa ca. 10.1 mi SE of Leesville, E of foothills known as Three Sisters Comment
  UCD57609  Bromus arenarius Beecher Crampton 1958-5-19 4802 Colusa 5.8 miles south of Lodoga. Comment
  CHSC117405  Bromus catharticus B. Castro; Tom Boullion 2008-7-10 1765 Colusa Sacramento Valley. Ca 3 air mi SE of Colusa, on W bank of the Sacramento River near Moon Bend Rd. at RM 141.4, just off Moon Bend Rd. 18 Comment
  UCD83625  Bromus diandrus Adam Clause; with PLB 102 class 2010-5-2 4 Colusa Walker Ridge. Eaton Springs. 20 meters south of the main road, on the flat valley floor. 709 Comment
  UCD58684  Bromus hordeaceus A. A. Beetle 1942-5-21 3272 Colusa 12 miles north of Williams. Comment
  UCD58711  Bromus hordeaceus Beecher Crampton 1962-4-17 6222 Colusa 3.3 miles north of College City. Comment
  CHSC71012  Bromus laevipes Vernon Oswald; Lowell Ahart 1998-5-7 8997 Colusa On a roadside bank. 487 Comment
  UC1055952  Bromus laevipes Helen K. Sharsmith 1953-6-19 4266 Colusa near confluence of North and Middle forks of Stoney Creek (Red Bridge Camp, Mendocino National Forest); Inner North Coast Ranges, Mendocino National Forest, Red Bri 548 Comment
  UCD58941  Bromus laevipes R. Tofsrud 1948-7-1 s.n. Colusa Colusa Co. Comment
  UCD81225  Bromus madritensis subsp. madritensis Ellen Dean; K. Mawdsley, B. Rice, G. Harrington, and J. Alderson 2009-5-6 5562 Colusa Payne Ranch, lands to the SW of the jct. of Hwys. 16 and 20. Destinella Flat area on the S side of Hwy. 20. Canyon to the south of Destanella Flat. 446 Comment
  CDA16100  Bromus madritensis subsp. rubens G. F. Hrusa 1999-5-16 15043 Colusa North Coast Ranges; Slopes above Fouts Springs, on serpentine, immediately below Verbena spring. Few on roadside, scattered here, dominant in a few sites. Annual. 594 Comment
  SEINET3922874  Bromus madritensis subsp. rubens Richard R. Halse 2002-3-21 6130 Colusa Williams; by junction of 5th Street and B Street.; 0 24 Comment
  JEPS80793  Bromus orcuttianus L. R. Heckard and J. C. Hickman 1981-7-30 5763 Colusa se Snow Mountain, going down Trout Creek Trout Creek; Snow Mountain, Trout Creek 1569 Comment
  RSA724142  Bromus rubens R. R. Halse 2002-3-21 6130 Colusa Williams; by junction of 5th Street and B Street. 24 Comment
  SEINET3923568  Bromus tectorum S. Bowie, J. Lopez; D. Riess 1994-4-23 0172 Colusa Leesville Quadrangle, Walker Ridge (BLM property). Collected along Bear Valley Road in Bear Valley, approx. 2.1 km south of intersection with Brimm Road.; 0 663 Comment
  UC1563843  Cacaliopsis nardosmia Barbara Ertter 1989-7-1 8595 Colusa road to Goat Mt. Lookout 2.2 mi s Rt. M-10 (Bear Creek-Fouts Spring Rd) (at head of creek, ca 12 airmiles wsw of Stonyford); S Fork Stony Creek 1500 Comment
  RSA141301  Cacaliopsis nardosmia J. M. Tucker, John Tothill 1959-5-30 3527 Colusa Road between Goat Mountain Lookout and Upper Letts Valley (ca. 2.5 miles, airline, north of the lookout), Goat Mountain. 1448 Comment
  UC1183418  Cacaliopsis nardosmia J. M. Tucker and John Tothill 1959-5-30 3527 Colusa Road between Goat Mountain Lookout, Goat Mountain and upper Letts Valley (ca. 2.5 mi air n of lookout) Comment
  UCD129652  Cacaliopsis nardosmia J. M. Tucker 1959-5-30 3519 Colusa Trough Spring, at northeast end of Trough Spring Ridge, ca. 5.75 miles (airline) southwest of Stonyford. 975 Comment
  HSC72159  Calandrinia ciliata J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9534 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  UCR73129  Calandrinia ciliata Mark Hershkovitz 1991-5-3 s.n. Colusa Bear Valley, along Bear Valley Rd. Near fenceline in central region of valley Comment
  HSC47509  Calandrinia ciliata Sheila Logan 1978-4-21 51 Colusa N of Bear Valley Rd. Comment
  UCD100196  Calandrinia ciliata Mark Hershkovitz 1991-5-3 s.n. Colusa Walker Ridge, along Walker Ridge Rd. nr. Turn-off to Bear Valley on north end; serpentine. Comment
  UCD82342  Calandrinia ciliata Robin McMaster 1973-4-15 332 Colusa middle of Bear Valley. Comment
  CHSC60670  Callitriche marginata Vernon H. Oswald 1993-4-14 5261 Colusa W side of O'Hair Rd., just S of Hwy. 20, Colusa National Wildlife Refuge, SW of Colusa. On the bottom of a depression in a field along the road. 18 Comment
  JEPS80389  Calocedrus decurrens L. R. Heckard and J. Hickman 1981-6-22 5622 Colusa at edge Veratrum meadow; Snow Mt., Dark Hollow Creek, Big Meadow, Veratrum meadow 1889 Comment
  CHSC112277  Calochortus amabilis Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18640 Colusa Inner North Coast Range. North side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  CHSC79618  Calochortus amabilis B. Castro; L. P. Janeway 2000-5-3 1126 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 313 Comment
  UC1733753  Calochortus amabilis Kay H. Beach 1940-5-16 660 Colusa Colusa and Lake county line Comment
  UC725389  Calochortus amabilis A. A. Heller 1940-5-6 15577 Colusa 2 mi w Highway 16 junction with State Highway 20 (on State Highway 20) Comment
  CAS-BOT-BC492117  Calochortus amabilis F. P. Cronemiller 1924-5-10 875 Colusa Mill Creek Ranger Station 609 Comment
  UCD63617  Calochortus amabilis Craig D. Thomsen 1999-5-12 2030 Colusa BLM Payne Ranch. Approximately 0.5 mile southwest of intersection of Hwy 16 and Hwy 20. On large knoll. Comment
  UCD139532  Calochortus luteus K. Esau 1934-5-6 s.n. Colusa West of Williams, Ukiah-Tahoe Highway. Comment
  CAS-BOT-BC491931  Calochortus luteus J. Clausen 1935-5-20 1012 Colusa 18 miles west of Williams on Bartlett Springs road Comment
  RSA601304  Calochortus luteus Jens Clausen 1935-5-20 1011 Colusa 18 mi W of Williams on Bartlett Springs Road. Past the Stonyford road. Comment
  UCD139535  Calochortus luteus Grady L. Webster 1977-5-15 7679 Colusa Bear Creek, ca. 0.5 mile west of junction of Wilbur Springs Road and Rtw. 20. 350 Comment
  UC1051720  Calochortus splendens Helen K. Sharsmith 1953-6-19 4276 Colusa e slope Snow Mountain (on Bonny Doon road); Inner North Coast Ranges, Mendocino National Forest 670 Comment
  UC1051717  Calochortus superbus Helen K. Sharsmith 1953-6-19 4269 Colusa near North and Middle Forks of Stony Creek confluence; Inner North Coast Ranges, Mendocino National Forest 548 Comment
  CHSC82628  Calochortus uniflorus Tara Morgan 2002-4-1 18 Colusa Found in Bear Valley located west of Highway 5 and north of Highway 20 within pastures. 385 Comment
  UCD139597  Calochortus uniflorus Clinton C. Shock 1980-5-3 59 Colusa Bear Valley, about 12 miles northwest of State Highway 20. 384 Comment
  SEINET8197763  Calochortus uniflorus M. J. Williams 1967-5-7 1187 Colusa Bear Valley. Comment
  SEINET8369630  Calochortus uniflorus Christine C. Lorain 1993-4-20 2235 Colusa 7.1 mi s of Leesville alogn Bear Valley Road near shart 90o turn in road (cattle yard). 427 Comment
  UCR212336  Calycadenia fremontii Craig D. Thomsen 2000-6-23 2401 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, south side of Hwy 20, c. 0.5 mi west of Hwy 20/16 intersection (between mileposts 2.17 and 2.25). 342 Comment
  RSA789275  Calycadenia micrantha R. L. Carr 1994-9-23 2656 Colusa Wilson Camp, southwest of Stoneyford, near the Colusa/Lake County line, ca. 3 air miles southeast of Goat Mountain. 1400 Comment
  UCD69191  Calycadenia multiglandulosa P. Rodriguez-Rojo; D. Sanchez-Mata 1997-7-25 s.n. Colusa Clear Lake-Williams. Southward Bear Valley Rd. D 415 Comment
  UC1552845  Calycadenia pauciflora Frederica Bowcutt 1985-6-19 605 Colusa just sw, n of Wilbur Hot Springs about 2 air miles Bear Valley Comment
  UCR44924  Calycadenia pauciflora L. F. LaPre 1986-5-30 s.n. Colusa Stony Creek Road, Mendocino Natl Forest 474 Comment
  CAS-BOT-BC270742  Calycadenia pauciflora Gerald D. Carr 1972-8-2 723 Colusa 0.6 mile W of Leesville - Lodoga Road on road to Cook's Springs Comment
  CAS-BOT-BC270744  Calycadenia pauciflora Gerald D. Carr 1972-7-29 722 Colusa 1.8 miles E of Walker Ridge Road on Deadshot Road, Deadshot Flat 731 Comment
  RSA255514  Calycadenia pauciflora Gerald D. Carr 1971-9-15 658 Colusa 6 miles north of Yolo County Line on Hwy. 16 Comment
  RSA255558  Calycadenia pauciflora Gerald D. Carr 1972-7-29 720 Colusa 0.3 miles east of Lake County line on Bartlett Springs Road Comment
  UC1876244  Calycadenia pauciflora Gerald D. Carr 1972-7-29 722 Colusa 1.8 mi E of Walker Ridge Rd. on Deadshot Rd. 731 Comment
  UC1876259  Calycadenia pauciflora Gerald D. Carr 1971-7-29 608 Colusa 1 mi S of Stoneyford on road to Lodoga. 365 Comment
  UC1971710  Calycadenia pauciflora 1978-8-20 2155 Colusa Brim Road (to Bartlett Springs), 1.5 mi W of jct with Bear Valley Road, ca. 3.6 mi SW of Leesville (=GDC 652) 482 Comment
  UCD129838  Calycadenia pauciflora Gerald D. Carr 1972-7-29 721 Colusa 3.1 miles south of Bartlett Springs Road on Walker Ridge Road, Buck Flat. 868 Comment
  UCD129870  Calycadenia pauciflora R. L. Carr 1978-8-20 2155 Colusa Brim Road (to Bartlett Spring), 1.5 miles west of junction with Bear Valley Road, around 3.6 miles southwest of Leesville. 482 Comment
  UCSB6412  Calycadenia pauciflora Keator, Glenn 1958-6-16 Colusa Along road from Lower Lake to Sacramento Valley just east of Lake-Colusa county line Comment
  UCD67591  Calycanthus occidentalis Charles Martin 1986-5-17 29 Colusa Along Fouts Spring Rd., 2.8 miles W of Stonyford, along roadside. Growing along small stream, soil dry. Large shrub, ca. 10 ft tall, flowers large, reddish. Comment
  UCD81713  Calycanthus occidentalis Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5719 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones Spring area on W side of road, ca. 6.5 road mi N of junction with Hwy 20. W side of road. 833 Comment
  UCD82572  Calycanthus occidentalis Craig Thomsen 2008-6-12 2763 Colusa Walker Ridge, Elgin Mine area. Comment
  UC1731405  Calyptridium quadripetalum Dean W. Taylor 1998-6-23 16713 A Colusa ca. 1 mi. s.e. Baldy Mt. (stock pond at head Doyle Canyon); N. coast Range Region (NCoRI), Walker Ridge, Doyle Canyon 853 Comment
  UCD163878  Calystegia collina Craig D. Thomsen 2001-5-24 2534 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 1 mile west of Hwy 20/16 instersection. Comment
  HSC48190  Calystegia collina subsp. collina Thomas W. Nelson, Jane Nelson 1978-4-29 3965 Colusa Along Hwy. 20 just E of Colusa-Lake Co. line 549 Comment
  UCD163873  Calystegia collina subsp. collina Craig D. Thomsen 2000-5-11 2307 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 1.5 mile west of Hwy 20/16 instersection. Comment
  RSA0059895  Calystegia collina subsp. collina Gloria R. Campbell 1948-6-18 653 Colusa 2 miles west of junction of Highways 16 and 20. Comment
  CHSC70976  Calystegia collina subsp. oxyphylla Vernon Oswald; Lowell Ahart 1998-5-7 9000 Colusa Barlett Springs Rod. 2.1 mi west of Bear Valley Rd., 0.8 mi east of Sawtelle Valley and Grapevine Flat roads. 524 Comment
  RSA800324  Calystegia collina subsp. oxyphylla Sandra M. Namoff, Eric R. Carter 2013-6-16 79 Colusa North of Hwy. 20 take Bear Valley Rd to Brim Rd, population is 0.2 miles NE of intersection of Brim Rd and Bartlett Springs Rd. 648 Comment
  JEPS81301  Calystegia occidentalis subsp. occidentalis L. R. Heckard and J. C. Hickman 1982-7-5 5915 Colusa slope below Summit Springs, S side Snow Mountain Comment
  HSC45719  Camissonia contorta Sheila Logan 1978-4-22 27 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  HSC45729  Camissonia ignota Mark Flippo 1978-4-22 15 Colusa Bear Valley Rd., 1.5 mi. from its jct. with Hwy. 20 412 Comment
  UCD146729  Camissoniopsis hirtella G. F. Hrusa 1998-6-19 14613 Colusa Inner North Coast Ranges. Above upper Little Stony Creek. Goat Mountain Roud around 1.5 km west of campground. 485 Comment
  UCD165932  Campanula griffinii Ellen Dean; with Tom Starbuck 2016-4-24 8843 Colusa BLM Bear Creek Ranch (formerly Payne Ranch). Lands to the southwest of the intersection of Highway 16 and Highway 20. On north-facing slope of knoll that is just south of corral area (corral at junction of Highways 16 and 20). 393 Comment
  UCD66822  Campanula griffinii D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley, Destanella Flat-Walker Ridge. 450 Comment
  CAS-BOT-BC37027  Capsella bursa-pastoris Roxana S. Ferris 1917-4-12 519 Colusa 4 miles east of Williams. Alkali Plains. Comment
  CHSC62923  Cardamine oligosperma Vernon H. Oswald; Lowell Ahart 1994-4-6 6056 Colusa Goat Mtn. Rd. 0.1 mi NE of Digger Pine Flat, S of Stonyford. On a roadside bank. 463 Comment
  CDA30193  Cardaria chalepensis D. Isle 2007-4-13 1633 Colusa East of Maxwell ~ 1 mile; south of Maxwell Road and East of Lyons Road in ditch between rice fields east of William Dirk s shop. Comment
  RSA0116218  Cardaria chalepensis David W. Isle 2007-4-13 1633 Colusa About 1 mile east of Maxwell; south of Maxwell Road and east of Lyons Road in ditch between rice fields east of William Dirk s shop. 30 Comment
  CHSC79446  Carduus pycnocephalus B. Castro 2000-5-2 1112 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 231 Comment
  UCD159527  Carduus pycnocephalus subsp. pycnocephalus D. S. Park 2011-4-6 276 Colusa Off Rt. CA-20. Roadside. Disturbed. Comment
  SEINET10644548  Carex Roxana S. Ferris 1917-4-17 Ferris 607 Colusa Moist earth in an oak grove. Sycamore Slough. Comment
  JEPS75133  Carex athrostachya L. R. Heckard 1972-7-8 3040 Colusa N side Snow Mountain (West Peak) 2011 Comment
  POM163445  Carex barbarae Roxana S. Ferris 1926-4-22 6315 Colusa Near Sycamore. Comment
  CHSC79590  Carex bolanderi L. P. Janeway 2000-5-31 6772 Colusa High North Coast Ranges. At Trough Spring; about 8.9 km southwest of Stonyford. 1049 Comment
  JEPS80864  Carex bolanderi L. R. Heckard and J. C. Hickman 1981-7-30 5754 Colusa Trout creek, SE side of Snow Mountain 1615 Comment
  CHSC94429  Carex densa Lowell Ahart 2006-8-22 13213 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  CHSC92529  Carex feta G. F. Hrusa; WTD 1998-6-19 14619 Colusa Wet area on spring along Goat Mtn. Rd. below intersection with USFS Pacific Ridge Rd. (M5). 975 Comment
  JEPS80866  Carex hoodii L. R. Heckard and J. C. Hickman 1981-7-31 5778 Colusa near Fouts Springs Overlook (e side of Snow Mt.); Snow Mt. 1798 Comment
  JEPS75132  Carex jonesii L. R. Heckard 1972-7-8 3060 Colusa upper reaches of Dark Hollow Creek in saddle between East Peak of Snow Mt. and West Peak of Snow Mt.; Snow Mt., Dark Hollow Creek 1981 Comment
  JEPS80378  Carex jonesii L. R. Heckard and J. Hickman 1981-6-22 5611 Colusa s side of east ridge of East Peak Snow Mt., East Peak 1950 Comment
  JEPS80857  Carex jonesii L. R. Heckard and J. C. Hickman 1980-9-16 5458 Colusa cirque area between peaks, ne slope of West Peak Snow Mt., West Peak 2011 Comment
  JEPS83819  Carex lenticularis var. impressa L. R. Heckard and J. Hickman 1980-9-16 5461 Colusa cirque area between peaks, ne slope of West Peak, Snow Mt. West Peak; Snow Mt., West Peak 2011 Comment
  JEPS75130  Carex luzulina var. luzulina L. R. Heckard 1972-7-8 3041 Colusa north side of ridge running southeast of Snow Mt., West Peak 2011 Comment
  UCD80894  Carex nudata Jack Alderson; G. Harrington 2009-3-25 25 Colusa BLM Bear Creek (Payne) Ranch, lands to the SW of the jct of Hwys 16 and 20. Brophy Canyon, lower reaches. 309 Comment
  CHSC85983  Carex pachystachya L. P. Janeway 2003-7-19 7907 Colusa High Cascade Range. Along the south edge of Little Willow Lake. Just above high water line. 1831 Comment
  UCD163311  Carex praegracilis Craig D. Thomsen 1997-4-13 1899 Colusa Bear Valley. About 6 miles north of Hwy 20. Southwest of old corral area (USGS Topo Map), where road takes a 90 degree turn to the north. Comment
  UCR228283  Carex praegracilis Ellen Dean, Gordon Harrington, Craig D. Thomsen, S. Harrison 2008-5-18 4947 Colusa Payne Ranch, owned by BLM, lands to the southwest of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20 399 Comment
  CAS-BOT-BC118348  Carex praegracilis Roxana S. Ferris 1917-4-17 625 Colusa Under trees, Sycamore Slough. Comment
  RSA262496  Carex praegracilis Sam Olusuyi 1967-4-29 35 Colusa 9 miles north of junction of Wilbur Springs Road and State Highway 20, Bear Valley. 396 Comment
  CHSC79853  Carex serratodens L. P. Janeway 2000-5-31 6771 Colusa High North Coast Ranges. At Trough Spring; about 8.9 km southwest of Stonyford. 1049 Comment
  UCD67060  Carex serratodens Craig D. Thomsen 2008-3-20 2716 Colusa BLM Payne Ranch. Lands to the SW of Hwy 20/16 intersection. South side of Hwy 20, about 0.5 mile west of Hwy 16/20 intersection, at Colusa Co. milepost 2.63. 600 Comment
  UCD67061  Carex serratodens Craig D. Thomsen 2008-3-20 2715 Colusa BLM Payne Ranch. Lands to the SW of Hwy 20/16 intersection. South side of Hwy 20, about 0.5 mile west of Hwy 16/20 intersection, at Colusa Co. milepost 2.63. 500 Comment
  UCD82720  Carex serratodens Craig Thomsen; G. Harrington 2009-5-14 2903 Colusa Colusa County on Walker Ridge: about 200 yds. south of spur road, 1/2 mile east of Walker Ridge Road, en route to Eaton Springs. 813 Comment
  UCD82727  Carex serratodens Craig Thomsen; G. Harrington 2009-5-14 2910 Colusa Colusa County on Walker Ridge: about 200 yds. south of spur road, 1/2 mile east of Walker Ridge Road, en route to Eaton Springs. 813 Comment
  JEPS75135  Carex subfusca L. R. Heckard 1972-7-8 3040 a Colusa on n side of ridge running se West Peak; Snow Mt. 2011 Comment
  JEPS83817  Carex subfusca L. R. Heckard 1972-7-8 3040 a Colusa on n side of ridge running se West Peak; Snow Mt. 2011 Comment
  CHSC77956  Castilleja affinis subsp. affinis Beth Hendrickson; Jean Witzman 1999-3-17 Colusa Vicinity of Antelope Valley, Grapevine Creek, and Sites-Lodoga Road. 158 Comment
  CHSC89621  Castilleja affinis subsp. affinis Caroline Warren; Jenny Marr 1998-5-4 Colusa Vicinity of Sites, Stone Corral Creek, and Antelope Valley. 106 Comment
  JEPS74811  Castilleja affinis subsp. affinis L. R. Heckard, T. I. Chuang and R. Bacigalupi 1975-5-7 4019 Colusa 4.5 mi se (by road) Leesville Comment
  CHSC71000  Castilleja applegatei subsp. martinii Vernon Oswald; Lowell Ahart 1998-5-7 8995 Colusa Bartlett Springs Rd. 1.6 mi west of Bear Valley Rd. 487 Comment
  CHSC88871  Castilleja applegatei subsp. martinii Christine Hantelman 2000-4-1 46 Colusa At side of Bear Valley Road. 365 Comment
  JEPS94198  Castilleja applegatei subsp. martinii Vernon Oswald and Lowell Ahart 1998-5-7 8995 Colusa Bartlett Springs Rd. 1.6 mi. w. of Bear Valley Rd. 487 Comment
  JEPS81324  Castilleja applegatei subsp. pinetorum L. R. Heckard and J. C. Hickman 1982-7-6 5939 Colusa slope 1/2 mi NE of Summit Springs (E of trail); Snow Mountain, S side 1645 Comment
  UCR37517  Castilleja applegatei var. applegatei C. G. Phillips, K. B. Barrows, L. Cole, S. A. Haultain 1984-4-29 Colusa Bear Valley Road, 2 mi north of Hwy. 20 366 Comment
  CAS-BOT-BC257276  Castilleja attenuata George K. Helmkamp; E. A. Helmkamp 2011-4-1 17122 Colusa Eastern Foothills North Coast Ranges: Antelope Valley, along Maxwell-Sites Road, 1.8 miles southeast of Sites 77 Comment
  CHSC27516  Castilleja attenuata Michael F. Henetz 1978-4-15 6 Colusa Ca. 150 m s of Hwy 20, ca. .5 km w of Williams. S central border of Section 36. 322 Comment
  SD239905  Castilleja attenuata George K. Helmkamp, E. A. Helmkamp 2011-4-1 17122 Colusa Eastern Foothills North Coast Ranges: Antelope Valley, along Maxwell-Sites Road, 1.8 miles southeast of Sites (Sites 7.5'Q) 77 Comment
  UCR233448  Castilleja attenuata George K. Helmkamp, E. A. Helmkamp 2011-4-1 17122 Colusa Eastern Foothills North Coast Ranges, Antelope Valley, along Maxwell-Sites Road, 1.8 miles southeast of Sites 77 Comment
  UCD122327  Castilleja attenuata Alpaslan Ongun 1961-4-16 38 Colusa South of wooden bridge; in Bear Valley, ca. 8 miles north of State Highway 20. Comment
  UCD122333  Castilleja attenuata Kim E. Steiner 1978-4-29 194 Colusa Walker Ridge Rd., 1.5 mi N of State Hwy 20. 777 Comment
  CHSC27558  Castilleja exserta W. K. Cheechov 1978-4-9 4 Colusa 5.1 mi w of Walker Ridge Rd., Hwy 20. 457 Comment
  CHSC27851  Castilleja exserta Susan Perkins 1978-4-8 33 Colusa Meadow ca. 3 mi w of jct. of Hwys 20 and 16, s side of Bear Creek, ca. 18 mi sw of Williams. 321 Comment
  CHSC60153  Castilleja exserta Bryan Case 1988-4-9 129 Colusa Ca. 0.3 mi w of jct of hwys 20 and 16, s side of Bear Creek, ca 18 mi se of Williams. 321 Comment
  UCD40887  Castilleja exserta R. Rhode 1984-4-21 s.n. Colusa 10 miles north of intersections of highways 16 and 20 in Bear Valley. 426 Comment
  JEPS10302  Castilleja exserta subsp. exserta W. L. Jepson 1932-5-7 16255 Colusa 1 mi above Venado (sw Colusa County) 274 Comment
  JEPS10303  Castilleja exserta subsp. exserta W. L. Jepson 1932-5-8 16282 Colusa Stonyford 365 Comment
  JEPS124296  Castilleja exserta subsp. exserta Lowell Ahart 2015-4-10 20026 Colusa About 4 mile south of Lodoga. Comment
  JEPS16218  Castilleja exserta subsp. exserta Rimo Bacigalupi and Arthur Holmgren 1950-4-26 3165 Colusa 8 mi nw Maxwell (along road Sites, on extreme w edge of the Sacramento Valley); Sacramento Valley Comment
  JEPS58564  Castilleja exserta subsp. exserta Rimo Bacigalupi 1969-4-13 9325 Colusa floor of Bear Valley, along county road on boundary between Townships 15N and 14N Bear Valley Comment
  RSA794941  Castilleja exserta subsp. exserta George K. Helmkamp, E. A. Helmkamp 2011-4-1 17125 Colusa Antelope Valley, along Maxwell-Sites Road, 0.4 miles southeast of Sites 93 Comment
  UCD64254  Castilleja exserta subsp. exserta Craig D. Thomsen 2000-3-31 2055 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  HSC67098  Castilleja exserta subsp. exserta D. Boyd, M. Eichelberger, Tim Messick, T. Ranker 1980-4-19 42 Colusa Along Bartlett Springs Rd., .6 mi. from Jct. with Hwy. 16 Comment
  CHSC112412  Castilleja foliolosa Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18642 Colusa Rocky serpentine outcrop on the north side of State Highway 20, just east of Lake County Line, 12.2 mile (air) east-northeast of Clear Lake (town), 17.1 miles west of Williams. 566 Comment
  CHSC48974  Castilleja foliolosa Vernon Oswald 1983-3-28 224 Colusa About 19.3 mi s 7 e of Stonyford on the Sites-Lodoga Rd. 457 Comment
  JEPS124251  Castilleja foliolosa Lowell Ahart 2015-4-1 19988 Colusa Inner North Coast Range. 1/2 mile east of Lake County Line, 12 miles (air) east-northeast of Clear Lake (town), 17 miles (air) west of Williams. Comment
  UCR225396  Castilleja foliolosa Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5092 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20. Western side of ranch along trail that follows the border of Lake and Colusa counties. South of Dunsfield Flat 648 Comment
  HSC99291  Castilleja foliolosa J. Carey, A. Hong, J. Leffingwell 1995-4-1 25 Colusa Brim Rd., 1.6 mi. W of junction with Bear Valley Rd. 488 Comment
  JEPS80826  Castilleja miniata L. R. Heckard and J. C. Hickman 1981-7-31 5798 Colusa e side Snow Mt. (Dark Hollow Creek); , Dark Hollow Creek 1615 Comment
  JEPS82554  Castilleja miniata L. R. Heckard 1983-7-27 6101 Colusa ca 2 mi w Stonyford road; Little Stony Creek 411 Comment
  CHSC111212  Castilleja miniata subsp. miniata David Isle 2013-8-23 2049 Colusa Stony Creek Watershed. W bank Salt Ck, ~ 150'NE of Dennis Dr Bridge on Isle Property. 374 Comment
  JEPS93868  Castilleja minor subsp. spiralis Vernon H. Oswald and Lowell Ahart 1998-7-15 9271 Colusa Bartlett Springs Road 1.6 mi w of Bear Valley Road; Bartlett Springs Road 487 Comment
  UC1238982  Castilleja minor subsp. spiralis Freed W. Hoffman 1947-6-19 1663 Colusa Cook's Spring; North Coast Ranges Comment
  JEPS11154  Castilleja rubicundula subsp. lithospermoides W. L. Jepson 1938-6-9 18964 Colusa mountains between Indian Valley and Bear Valley (between Lake County and Colusa County) 579 Comment
  CHSC112315  Castilleja rubicundula subsp. rubicundula Lowell Ahart 2013-5-1 18687 Colusa Inner North Coast Range. Near a small drainage, north of the wash and State Highway 20, just east of Lake County Line, 12.2 mile (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  CHSC34821  Castilleja rubicundula subsp. rubicundula M. S. Taylor; E. Pierce 1981-5-17 3757 Colusa On e side of Ladoga-Stonyford Rd. 335 Comment
  CHSC56783  Castilleja rubicundula subsp. rubicundula Peggy Brennan 1980-4-19 107 Colusa Ca 0.3 mi west of junction of Hwy 20 and Hwy 16; south side of Bear Creek, ca 18 mi southwest of Williams. 321 Comment
  JEPS11156  Castilleja rubicundula subsp. rubicundula W. L. Jepson 1932-5-8 16284 Colusa Stonyford; w Colusa County 365 Comment
  JEPS124233  Castilleja rubicundula subsp. rubicundula Lowell Ahart 2015-4-1 19987 Colusa Inner North Coast Range. 1/2 mile east of Lake County Line, 12 miles (air) east-northeast of Clear Lake (town), 17 miles (air) west of Williams. Comment
  UCD123057  Castilleja rubicundula subsp. rubicundula John M. Tucker 1980-5-3 4444 Colusa Bear Valley, 4.3 mi. south of junction of Brim Road and Bear Valley Road. 396 Comment
  UCD82578  Castilleja rubicundula subsp. rubicundula Craig Thomsen 2008-6-12 2768 Colusa Bear Creek (formerly Payne) Ranch. South side of Hwy 20, ca. 0.25 mi W of Hwy 16. West and SW of the corral that is located at the junction of Hwy 16 and 20. Comment
  CDA11400  Castilleja tenuis G. F. Hrusa, K. van Katwyk 1995-4-22 12120 Colusa Inner North Coast Ranges; flat on Walker Ridge Road, approx. 6 m. S of intersection with Bartlett Springs Rd. Comment
  SEINET10539694  Caulanthus Katherine L. Morris 1973-6-6 Morris 385 Colusa Chaparral woodland and sparse oaks; on hwy 20, 0.3 mi e of lake county line. Comment
  RSA0121887  Caulanthus flavescens Roxana S. Ferris 1926-4-23 6405 Colusa Near Mountain House on the Williams-Stonyford Road. Comment
  CHSC112311  Caulanthus lasiophyllus Lowell Ahart 2013-5-1 18681 Colusa Inner North Coast Range. Near a small drainage, north of the wash and State Highway 20, just east of Lake County Line, 12.2 mile (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  CAS-BOT-BC48829  Ceanothus cuneatus Roxana S. Ferris 1926-4-23 6580 Colusa Stonyford Comment
  CDA12246  Ceanothus cuneatus G. F. Hrusa 1989-2-7 5808 Colusa Inner North Coast Ranges; Leesville Road between Bear Valley & Williams. Comment
  HSC47566  Ceanothus cuneatus J. P. Smith, J. O. Sawyer 1978-4-29 9768 Colusa Walker Ridge Rd. 3.4 mi. from its jct. with Hwy. 20 Comment
  UCD22472  Ceanothus cuneatus Brian Vanden Heuvel 2003-2-20 201 Colusa 6.7 miles west of Stonyford on Fouts Spring Road. Comment
  CAS-BOT-BC50803  Ceanothus integerrimus Brent Helm; Curtis Miller; Mark Steiger 1988-4-16 74 Colusa 2.4 miles west on Goat Mountain Rd., off of Lodoga-Stonyford Rd. 441 Comment
  UCD146602  Ceanothus integerrimus G. F. Hrusa 1998-6-19 14637 Colusa North Coast Ranges. On Trough Ridge Road. (To Fouts Springs, from Pacific Ridge Road.) 1200 Comment
  UCD170260  Ceanothus integerrimus D. O. Burge 2016-11-3 2185 Colusa Fouts Springs area, roadside on Forest Road M10, E of Fouts Springs. 630 Comment
  UCD170262  Ceanothus integerrimus D. O. Burge 2016-11-3 2186 Colusa Fouts Springs area, roadside on Forest Road M10, E of Fouts Springs. 610 Comment
  UCD170263  Ceanothus integerrimus D. O. Burge 2016-11-3 2187 Colusa Little Stony Creek watershed, roadside on Goat Mountain Road. 415 Comment
  UCD112068  Ceanothus jepsonii D. Sanchez-Mata 1998-7-9 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain Road between Lodoga and Red Rock Cabin. At Stoney Creek. 450 Comment
  SEINET13945967 Image available Ceanothus jepsonii Thomas E. Higley 1974-1 69 Colusa 3/4 mi N of T junction ofIndian Valley; 2800 ft alt., T14N R6W SEC12 Comment
  HSC60452  Ceanothus jepsonii var. albiflorus J. P. Smith 1977-4-24 9036 Colusa Along Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  RSA757814  Ceanothus jepsonii var. albiflorus Dylan O. Burge 2008-5-27 DOB 997 c Colusa Rathburn-Petray Mine complex, east of Eaton Springs, 12.3 km 193 degrees true south-southwest of Leesville. 700 Comment
  UCD72391  Ceanothus oliganthus var. sorediatus Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5117 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Southwestern edge of ranch above Cache Creek Canyon along ridge trail. 548 Comment
  UCD81261  Ceanothus oliganthus var. sorediatus Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5426 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Just north of the road leading up from the confluence of Bear and Cache Creeks. 323 Comment
  UCR225463  Ceanothus oliganthus var. sorediatus Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5117 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20. Southwestern edge of ranch above Cache Creek Canyon along ridge trail 548 Comment
  CDA15500  Ceanothus parryi G. F. Hrusa, WTD 1998-6-19 14637 Colusa North Coast Ranges; Trough Ridge Rd. (to Fouts Springs, from Pacific Ridge Rd.) Comment
  UCD66479  Centaurea calcitrapa Craig D. Thomsen 2001-5-6 2556 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on north side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 2.80. 310 Comment
  JEPS104358  Centaurea melitensis Lowell Ahart 2003-7-14 10387 Colusa By a wash, on the e side of Bear Valley Rd, ca 3 mi nw of Highway 20. 381 Comment
  UCD163227  Centaurea melitensis Craig D. Thomsen 2000-6-23 2407 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 1 mile west of Hwy 20/16 intersection. 345 Comment
  RSA725012  Centaurea solstitialis L. Ahart 2006-8-9 13148 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
  UCR206392  Centaurea solstitialis George K. Helmkamp, E. A. Helmkamp 2009-5-20 14758 Colusa Inner North Coast Ranges, along CA-16, 1.8 miles north of the Yolo County line 271 Comment
  UCR227905  Centaurium trichanthum Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5060 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20, area of ranch west of Hwy 16, near bridge that spans Bear Creek, c. 4.5 road miles south of junction of Hwy 16/20. Bank of Bear Creek near south end of bridge, east side of creek 555 Comment
  RSA92959  Centaurium trichanthum Milo S. Baker 1941-7-8 10115 Colusa Colusa County: roadside ditch Bear Valley in adobe, S of Lodoga Comment
  UCD20134  Centromadia Donald W. Kyhos 1962-8-4 62 -184 Colusa 5.4 miles east of Colusa County line on Hwy 99. Comment
  UCD55450  Centromadia fitchii Ellen Dean; Gordon Harrington 2006-10-6 3275 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 374 Comment
  JEPS104140  Centromadia parryi subsp. rudis Lowell Ahart 2003-8-15 10510 Colusa On the south side of Highway 20, ca 1 mi sw of Williams. 27 Comment
  JEPS118677  Centromadia parryi subsp. rudis B. Castro with Dave Bogener 2011-9-1 1912 Colusa Sacramento Valley. 10 air mi NW of Colusa, 3 mi W of the Sacramento River and 800 ft N of the northern boundary of Delevan NWR. Near where Hunters and Logan Creeks empty into the Colusa Basin Drain. Moulton Weir 7.5' quad. Comment
  SBBG119873  Centromadia parryi subsp. rudis L. Ahart 2003-8-15 10510 Colusa S side of St Hwy 20, ca. 1 mi SW of Williams 27 Comment
  UC1069558  Centromadia parryi subsp. rudis H. S. Yates 1936-8-14 17575 Colusa 3 mi s Colusa Comment
  UCD16094  Centromadia pungens J. Schmierer 1999-4-27 s.n. Colusa Exact location unknown. Comment
  JEPS105679  Centromadia pungens subsp. pungens L. P. Janeway 2002-4-25 7525 Colusa Sacramento Valley; vicinity of Funks Creek and Tehama - Colusa Canal 51 Comment
  UC195398  Centromadia pungens subsp. pungens A. A. Heller 1916-6-9 12391 Colusa along the state hwy near Colusa Comment
  UCD58094  Cerastium glomeratum Ellen Dean; C. Thomsen, S. Bledsoe, G. Harrington, D. Hickson 2007-3-25 3471 Colusa BLM Payne Ranch. Lands to the southwest of the intersection of Hwy. 16 and Hwy. 20. Destinella Flat, just E of the Lake County Border. Ca. 3.4 miles along Hwy. 20 from junction of Hwy. 20 and Hwy. 16. 560 Comment
  UCD137756  Ceratophyllum demersum J. S. Jones 1926-7-16 s.n. Colusa Colusa. Comment
  HSC31623  Cercis occidentalis Glenn McGourty 1974-4-20 7 Colusa Roadcut of Hwy. 16, 17 mi. E of Esparto Comment
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Aug 13 2014
  SFV8462  Cercis occidentalis R. D. Deragisch 1969-4-20 12 Colusa Near Bear Creek Bridge on CA State Highway 16, about 2 miles north of Colusa-Yolo County line. 152 Comment
  CAS-BOT-BC136987  Cercocarpus betuloides var. betuloides Roxana S. Ferris 1926-4-23 6419 Colusa Grade beyond Mountain House on Williams - Stonyford Road Comment
  UCR206710  Cercocarpus betuloides var. betuloides George K. Helmkamp, E. A. Helmkamp 2009-3-17 14397 Colusa Inner North Coast Ranges Foothills, along CA-16 and Bear Creek, 7.0 miles south of the junction with CA-20; just north of the Yolo County line 194 Comment
  UC630425  Chaenactis glabriuscula var. heterocarpha Annetta Carter 1938-5-8 1394 Colusa 4 mi se of Wilbur Springs; Inner North Coast Ranges, Bear Creek Canyon Comment
  UC638668  Chaenactis glabriuscula var. heterocarpha Ethel Crum 1938-5-7 2014 Colusa 4.2 mi n of Rumsey; Inner North Coast Ranges, Comanche Hills 254 Comment
  UCD81859  Chaenactis glabriuscula var. heterocarpha Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5743 Colusa Walker Ridge. Along Walker Ridge Road. Lookout area with fence and view of Indian Valley Reservoir. North of turnoff to Indian Valley Reservoir and S of turnoff to picnic area. W side of road. 1061 Comment
  JEPS2596  Chamaesyce ocellata subsp. rattanii Volney Rattan June 1884 Colusa n San Francisco Bay; Coast Mts., Stony Creek; Stony Creek, Colusa Co., N of San Francisco Bay Comment
  JEPS110186  Chamaesyce serpillifolia subsp. hirtula Lowell Ahart 2006-8-9 13115 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  CHSC77333  Chamaesyce serpillifolia subsp. serpillifolia Heidi West; Joyce Lacey-Rickert 1998-10-29 Colusa Vicinity of Antelope Valley and Sites. 109 Comment
  CHSC94456  Chamaesyce serpillifolia subsp. serpillifolia Lowell Ahart 2006-8-9 13115 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  IRVC29631  Cheilanthes Mark A. Elvin, Mark S. Brunell, David Isle 2006-8-3 5027 Colusa Snow Mtn; Summit Spring Trail; 1.4km W of Snow Mtn West summit; 800m N of Cedar Camp. Southern Northern Inner Coast Ranges 1989 Comment
  UC1415295  Cheilanthes gracillima Dale E. Johnson and J. E. Eckenwalder 1974-6-2 127 Colusa ridge connecting E and W Peaks Snow Mt 2150 Comment
  CDA1337  Chenopodium album L. Ahart 2004-10-4 11430 Colusa East side of Leesville Road, about 4.7 miles by road southeast of the intersection of Bear Valley Road, Leesville Ladoga Road and Leesville Road, northeast of Bear Valley. Comment
  RSA724893  Chenopodium album L. Ahart 2006-8-22 13221 -A Colusa south side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford. 349 Comment
  JEPS110058  Chenopodium berlandieri Lowell Ahart 2006-8-22 13220 A Colusa South side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford 349 Comment
  RSA724958  Chenopodium botrys L. Ahart 2006-8-9 13119 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
  UCD63033  Chenopodium californicum Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4685 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Along west side of Bear Creek, opposite Cowboy Canyon. 312 Comment
  UCD168861  Chenopodium strictum var. glaucophyllum John Anderson 2015-1 s.n. Colusa about 0.5 mile north of Colusa Casino west of Highway 45. Comment
  UCD37706  Chloris virgata Beecher Crampton 1961-7-20 5932 Colusa 2 miles S of Grimes. Comment
  CAS-BOT-BC238007  Chloropyron palmatum Dean Wm. Taylor 1988-8-8 10024 Colusa Sacramento Valley. Colusa National Wildlife Refuge, in the far SE corner of the Refuge along Ohm Road 1 mile N of Ware Road 22 Comment
  SEINET10745049  Chloropyron palmatum R. Stinchfield 1916-6-17 Stinchfield 284 Colusa In alkaline soil, overflowed lands at Tule near College City Comment
  CHSC86966  Chorizanthe membranacea B. Castro; Michelle Cedarborg 2003-5-6 1430 Colusa Vicinity of Logan Ridge, Sites Peak and Lurline Creek. 219 Comment
  CHSC86996  Chorizanthe membranacea B. Castro 2003-5-14 1433 Colusa Vicinity of Logan Ridge, Sulphur Gap and Lurline Creek. On west edge of Sacramento Valley. 134 Comment
  HSC45743  Chorizanthe membranacea Stephen Plant 1978-4-22 216 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  UCD57280  Chorizanthe membranacea Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3648 Colusa BLM Payne Ranch. Mouth of Craig Canyon. Along unimproved road, about 2 road miles south of junction of Hwy 20 and Hwy 16. . 316 Comment
  UCR138873  Chorizanthe membranacea B. Ellyson, J. Hooke, D. Newman 1996-5-5 43 Colusa Coast Range, Leesville, 9.7 mi NW of Hwy 20 on Leesville Rd.; 70 mi east of Hwy 101 on Hwy 20 445 Comment
  RSA133247  Chrysothamnus nauseosus subsp. albicaulis Peter H. Raven, R. Snow 1959-9-11 14416 Colusa 0.5 mile south of Snow Mt. 1921 Comment
  CHSC93137  Cicuta douglasii D. Isle 2001-7-26 1388 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. In spring west of Letts Lake day use area. Comment
  UCD165930  Cirsium cymosum Ellen Dean; with Tom Starbuck 2016-4-24 8841 Colusa BLM Bear Creek Ranch (formerly Payne Ranch). Lands to the southwest of the intersection of Highway 16 and Highway 20. On north-facing slope of knoll that is just south of corral area (corral at junction of Highways 16 and 20). 391 Comment
  UCD66565  Cirsium cymosum Craig D. Thomsen 2001-5-24 2520 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  CDA1191  Cirsium douglasii var. breweri G. D. Barbe, Daryl Brown 1982-7-2 3892 Colusa Lower Letts Lake, Mill Valley Campground. Comment
  UCD159335  Cirsium douglasii var. breweri D. S. Park; E. Dean 2010-6-5 119 Colusa Walker ridge, Cold Spring Mt. 886 Comment
  JEPS81287  Cirsium occidentale var. venustum L. R. Heckard and J. C. Hickman 1982-7-5 5898 Colusa slope below (s of) area Summit Springs (s side of mountain); Snow Mt., Summit Springs 1500 Comment
  UCD81256  Cirsium vulgare Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5421 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Just north of the road leading up from the confluence of Bear and Cache Creeks. 323 Comment
  CHSC32911  Clarkia affinis C. Macdonald; P. Powers, C. Raley, J. Spitler, D. Stamp 1980-4-19 55 Colusa Leesville Road, road from Leesville to Williams, 3.8 miles east of Leesville. Comment
  CHSC86959  Clarkia affinis B. Castro 2003-4-10 1421 Colusa Vicinity of Logan Ridge, Sulphur Gap and Lurline Creek. In E-trending small side canyon tributary. 158 Comment
  JEPS105670  Clarkia affinis L. P. Janeway 2002-4-24 7518 Colusa Sacramento Valley/Inner North Coast Ranges border. Vicinity of Logan Ridge, Stone Corral Creek, Funks Creek, and Golden Gate 124 Comment
  UC762214  Clarkia affinis R. F. Hoover 1938-4-24 3231 Colusa below Sites; Stone Corral Canyon Comment
  CDA37986  Clarkia affinis T. C. Fuller 1958-5-28 s.n. Colusa Highway 20, 2 miles west of junction with Highway 16. 0 Comment
  LA17909  Clarkia concinna Peter H. Raven; 1962-5-31 sn Colusa State Hwy 20, 2.5 mi E of Lake County line Comment
  JEPS90048  Clarkia concinna subsp. concinna Dean Wm. Taylor with Glenn Clifton 1990-6-11 11222 Colusa along Goat Mountain Road 2.9 mi w from junction of Logada-Stonyford Road 0.1 mi downstream w confluence of Frenzel Creek, Little Stony Creek drainage Frenzel Creek; North Coast Ranges, Frenzel Creek Research Natural Area 441 Comment
  UCD66706  Clarkia concinna subsp. concinna Craig D. Thomsen 2001-5-24 2502 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  POM216174  Clarkia concinna subsp. concinna D. D. Keck 1933-5-30 2401 Colusa 1 mile east of Lake County line, west of Wilbur Springs Comment
  RSA0060004  Clarkia concinna subsp. concinna G. R. Campbell 1948-6-18 654 Colusa 2 miles west of junction of Highway 16 and Highway 20 Comment
  UC1552828  Clarkia gracilis Frederica Bowcutt 1985-5-5 506 Colusa ca. 1 mi nw Wilbur Springs Comment
  CHSC48626  Clarkia gracilis subsp. gracilis Vernon Oswald 1984-5-2 1163 Colusa Sites-Lodoga Rd. 9.5 mi w of Sites. On a road cut. 533 Comment
  CHSC86869  Clarkia gracilis subsp. gracilis B. Castro; Shirley Innecken 2003-4-9 1417 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Grapevine Creek. 164 Comment
  CAS-BOT-BC172035  Clarkia gracilis subsp. gracilis Tamara Gedik; Thom Heinz; Rebecca Siegle 1996-5-4 52 Colusa 8.4 mi. north of Indian Reservoir Rd. on Walker Ridge Rd., campground. 670 Comment
  CDA12217  Clarkia gracilis subsp. tracyi G. F. Hrusa 1993-6-1 11165 Colusa North Coast Biodiversity Arena; Bear Valley-Bartlett Springs Rd. midway up east side of Walker ridge. Comment
  CAS-BOT-BC163285  Clarkia modesta Peter H. Raven 1963-5-20 18401 Colusa 9.5 miles east of Houghs Springs (Lake County) Comment
  RSA0059906  Clarkia modesta Peter H. Raven 1963-5-20 18401 Colusa 9.5 miles east of Houghs Springs (Lake County) Comment
  HSC86833  Clarkia purpurea S. L. Steinwert 1985-4-13 10 Colusa Salt Canyon, N side of Salt Creek, Hwy. 20, 11 mi. WSW of Williams 143 Comment
  CHSC85962  Clarkia purpurea subsp. quadrivulnera Jenny Marr; Heidi West, Joyce Lacey-Rickert, Caroline Warren 1998-5-8 Colusa Vicinity of Sites and Antelope Valley. 152 Comment
  UCD64423  Clarkia purpurea subsp. quadrivulnera Craig D. Thomsen 2000-4-28 2180 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UC1051695  Clarkia purpurea subsp. quadrivulnera Helen K. Sharsmith 1953-6-18 4258 Colusa near Fouts Springs (above Mill Creek); Inner North Coast Ranges, Mendocino National Forest 609 Comment
  CHSC25155  Claytonia exigua subsp. exigua J. D. Sagray 1970-4-4 5 Colusa 1 mi w of Abbott Mercury Mine on Hwy 20, 2 ft off side of Hwy. 594 Comment
  UC1745699  Claytonia exigua subsp. exigua Annetta M. Carter, Sarah Dyal, Ethel Crum 1938-5-8 1388 Colusa Between Leesville & Stonyford. 6.6 mi. S of Lodoga. 3 mi. N of Leesville. Comment
  UCD66462  Claytonia exigua subsp. exigua Craig D. Thomsen 2001-4-12 2457 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  CAS-BOT-BC439114  Claytonia exigua subsp. exigua K. L. Chambers 1978-3-19 4423 Colusa Hwy. 20 between Williams and Clear Lake, Inner Coast Range, 15.8 mi. W of Hwy. 5 and 2.9 mi. E of junction with Hwy. 16. Comment
  UC1051500  Claytonia exigua subsp. exigua Helen K. Sharsmith 1953-6-19 4281 Colusa near Trough Springs (on Trough Springs Ridge); Inner North Coast Ranges, Mendocino National Forest 975 Comment
  CHSC112263  Claytonia exigua subsp. glauca Lowell Ahart 2013-5-1 18677 Colusa Inner North Coast Range. On the south side of the wash, north side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  UC1745697  Claytonia gypsophiloides Annetta M. Carter, Sarah Dyal, Ethel Crum 1938-5-8 1380 Colusa Between Leesville & Stonyford. 6.6 mi. S of Lodoga. 3 mi. N of Leesville. Comment
  CDA12162  Claytonia parviflora G. F. Hrusa 1989-5-7 6090 Colusa North Coast Ranges; N side of Little Stony Creek, approx. 3 miles upstream from junction with Stonyford-Lodoga Rd. Comment
  UCD66466  Claytonia parviflora Craig D. Thomsen 2001-4-12 2458 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  UCD67063  Claytonia parviflora Craig D. Thomsen 2008-3-20 2717 Colusa BLM Payne Ranch. Lands to the SW of Hwy 20/16 intersection. South side of Hwy 20, about 0.5 mile west of Hwy 16/20 intersection, at Colusa Co. milepost 2.63. 450 Comment
  UCD82628  Claytonia parviflora Craig Thomsen; G. Harrington 2009-5-12 2900 Colusa Colusa County on Walker Ridge: from spur road about 1/2 mile east of Walker Ridge Road, en route to Eaton Springs. 813 Comment
  UCD82629  Claytonia parviflora Craig Thomsen; G. Harrington 2009-5-12 2901 Colusa Colusa County on Walker Ridge: from spur road about 1/2 mile east of Walker Ridge Road, en route to Eaton Springs. 813 Comment
  UC638662  Claytonia parviflora subsp. parviflora Ethel Crum 1938-5-8 2021 Colusa 3 mi n Leesville; Inner North Coast Ranges Comment
  UC1051503  Claytonia parviflora subsp. parviflora Helen K. Sharsmith 1953-6-19 4285 Colusa near Trough Springs (on Trough Springs Ridge); Inner North Coast Ranges, Mendocino National Forest 975 Comment
  UCD56942  Claytonia perfoliata Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3544 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Thompson Canyon. 349 Comment
  CAS-BOT-BC440035  Claytonia perfoliata subsp. perfoliata Roxana S. Ferris 1926-4-21 6311 Colusa Sycamore Slough near Sycamore Comment
  SEINET199005  Claytonia saxosa H. K. Sharsmith 1953-6-20 4292 Colusa Mendocino National Forest ; Summit of Goat Mt. Lake-Colusa boundary 1864 Comment
  UC1051737  Claytonia saxosa Helen K. Sharsmith 1953-6-20 4292 Colusa summit of Goat Mountain Inner North Coast Ranges, Mendocino National Forest, Goat Mt (Lake-Colusa boundary) 1864 Comment
  UCD67098  Claytonia saxosa Ellen Dean; Davis Botanical Society 2008-5-31 5026 Colusa west of I-5 at Maxwell, Goat Mountain, ridge below summit off of Goat Mountain Road. 1734 Comment
  SFV8355  Clematis lasiantha D. Grau 1972-4-1 4 Colusa Highway 16, 5 miles south of junction with Highway 20. Comment
  CHSC111245  Clematis ligusticifolia B. Castro 2008-7-10 1773 Colusa Sacramento Valley. Along S bank of Sacramento River, ca 5 mi N of town of Colusa, just N of Reservation Road; in undesignated section near Colusa Rancheria. 18 Comment
  JEPS108908  Clematis ligusticifolia Lowell Ahart 2006-8-9 13094 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford 455 Comment
  UCD61470  Clematis ligusticifolia Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3916 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1000 ft S of parking lot, along Bear Creek. 312 Comment
  POM257147  Collinsia bartsiifolia var. bartsiifolia E. K. Crum 1938-5-8 2020 Colusa 3 miles north of Leesville. Comment
  CHSC27553  Collinsia grandiflora Scott E. Patton 1978-4-9 8 Colusa Ca. 0.3 m w of jct of Hwys. 20 and 16, s side of Bear Creek, ca. 18 m sw of Williams. 321 Comment
  SEINET12290591  Collinsia grandiflora L. L. Pate 1978-1 83 Colusa ca 0.3 mi W of jct of Hwy 20 & 16, S side of Bear Creek, ca 18 mi SW of Williams Comment
  UCD81721  Collinsia greenei Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5725 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones Spring area on W side of road, ca. 6.5 road mi N of junction with Hwy 20. W side of road. 833 Comment
  CHSC33348  Collinsia heterophylla R. M. Winchell 1980-4-12 1 Colusa Ca. 0.3 mi. w of jct. of Hwys. 20 and 16, s side of Bear Creek, ca. 18 mi. sw of Williams. 321 Comment
  CDA34126  Collinsia heterophylla P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  CHSC88866  Collinsia sparsiflora Christine Hantelman 2000-4-1 39 Colusa In Bear Valley. West side of creek. Comment
  UC725923  Collinsia sparsiflora var. arvensis A. A. Heller 1937-4-24 15352 Colusa 13 mi w of Williams (on State Highway #20) Comment
  HSC44465  Collinsia sparsiflora var. collina R. York 1978-4-22 140 Colusa Bear Valley Rd., 1.5 mi. from its junction with S.R. 20 409 Comment
  JEPS80164  Collinsia torreyi var. wrightii L. R. Heckard with J. Hickman 1980-7-2 5315 Colusa ca 10 mi w Stonyford (trail from Frog Pond to Milk Ranch, w of West Peak, Snow Mt.); Snow Mt. 1950 Comment
  HSC31719  Collomia diversifolia Teresa Prendusi 1974-5-4 51 Colusa Beyond Clyde Mine 1/8 mi. 854 Comment
  UC1191132  Collomia diversifolia Herbert L. Mason 1953-5-5 14519 Colusa s end Cracker Box Ridge (along creek); Little Stoney Creek Comment
  UCD81711  Collomia diversifolia Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5717 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones Spring area on W side of road, ca. 6.5 road mi N of junction with Hwy 20. W side of road. 833 Comment
  UCD81856  Collomia diversifolia Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5740 Colusa Walker Ridge. Along Walker Ridge Road. Lookout area with fence and view of Indian Valley Reservoir. North of turnoff to Indian Valley Reservoir and S of turnoff to picnic area. W side of road. 1061 Comment
  CDA40008  Collomia diversifolia Vernon H. Oswald & Lowell Ahart 1998-5-7 9006 Colusa Bartlett Springs Road 2.1 miles west of Bear Valley Road, 0.8 mile east of Sawtelle Valley and Grapevine Flat roads. Comment
  CHSC64135  Collomia tinctoria David Isle 1992-8-3 Colusa Snow Mountain. Just west of the helispot. Comment
  JEPS15537  Collomia tinctoria G. Thomas Robbins with L. R. Heckard 1956-7-25 3695 Colusa open rocky slope in woods on ridge above Fouts Camp (along trail to Snow Mt. (about 1 1/2 mi airline se of summit), on Lake-Colusa County boundary) 1920 Comment
  JEPS80144  Collomia tinctoria L. R. Heckard with J. Hickman 1980-7-2 5305 Colusa trail from Summit Springs to Snow Mt. Peaks (ca 10 mi w of Stonyford, Colusa-Lake Co. boundary) 1706 Comment
  UCD73112  Conium maculatum Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3826 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. West side of Bear Creek, ca. 0.25 mile downstream of bridge. 246 Comment
  CHSC13499  Convolvulus arvensis L. V. Ritter 1969-4-30 217 Colusa Ca 6 mi. sw of Williams, w side of Highway 20. Comment
  UCR201548  Convolvulus arvensis George K. Helmkamp, E. A. Helmkamp 2008-10-14 14266 Colusa Sacramento Valley, along River Road (generally following the Sacramento River), 8.4 miles north of Colusa 17 Comment
  POM66158  Convolvulus arvensis Roxana Stinchfield 1916-7-8 401 Colusa Truck garden Stinchfield Ranch - Sycamore Slough. Comment
  CHSC67606  Cordylanthus palmatus James D. Jokerst 1988-8-23 3036 Colusa Delevan National Wildlife Refuge S of Willows, in Cell 12. Comment
  JEPS83552  Cordylanthus palmatus R. D. Stone 1987-8-26 850 Colusa w side of Ohm Rd ca 0.5 mi n jct. w/ Ware Rd.; Colusa Nat'l Wildlife Refuge, Arbuckle 7.5' quad. 13 Comment
  JEPS83553  Cordylanthus palmatus R. D. Stone 1987-8-26 850 Colusa w side of Ohm Rd ca 0.5 mi n jct. w/ Ware Rd. (corner of Colusa Nat'l Wildlife Refuge); Colusa Nat'l Wildlife Refuge, Arbuckle 7.5' quad. 13 Comment
  RSA0084707  Cordylanthus palmatus Ellen Cypher 2004-9-9 2004 -018 Colusa Delevan National Wildlife Refuge, Tract 33, CNDDB EO# 20 17 Comment
  JEPS80717  Cordylanthus pilosus subsp. pilosus L. R. Heckard and J. C. Hickman 1981-7-28 5677 Colusa 3.7 km e Ladoga Bridge (w of Maxwell, along roadside) Comment
  JEPS75706  Cordylanthus pilosus subsp. pilosus L. R. Heckard and R. Bacigalupi 1976-9-6 4456 Colusa 6 airmiles se Fouts Springs (along road to Summit Springs, below and w of Summit Springs, 1 mi n of junction with Stoneyford Rd., Colusa-Lake County line); Snow Mt. 1219 Comment
  RSA500440  Cordylanthus pringlei Vernon H. Oswald 1989-4-12 4008 Colusa Goat Mtn Rd. 2.1 mi wsw of Lodoga-Stonyford Rd, ca. 6 mi (air) s of Stonyford. On the n side of Little Stony Creek. 412 Comment
  UCD123117  Cordylanthus pringlei Craig Thomsen; Art Shapiro 2004-9-16 s.n. Colusa along Cool Springs Road. Comment
  UCD63123  Cordylanthus tenuis Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4953 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20. 416 Comment
  SBBG50832  Cornus glabrata J. K. Clark 1966-5-8 23 Colusa Lodoga to Stonyford Rd, 2.5 mi NW of Lodoga 320 Comment
  UC1776781  Cornus glabrata G. F. Hrusa 1989-5-7 6086 Colusa North Coast Ranges; Road to Cedar Mtn., along Little Stony Creek, approx. 2.5 miles above intersection with Stonyford-Lodoga Rd. Shaded area beneath Populus fremontii 450 Comment
  CHSC100407  Cotula australis John Dittes; Josephine Guardino 2008-3-14 1513 Colusa Great Central Valley; Sacramento Valley; between Butte Sink and Sacramento River, north of Sutter Buttes; ca. 1.6 air-miles south of Gridley Road, ca. 1.1 air-miles west of Drumheller Slough. 17 Comment
  CHSC101636  Cotula coronopifolia David Isle 2006-5-5 1627 Colusa Mendocino National Forest; SW of Maxwell cardlock gas station (S of Maxwell and just W of HW 99W). S end of pre-chiseled Jack Barrett rice check #8 of 10 (counting N to S). 30 Comment
  UCD18850  Cotula coronopifolia Vernal Pool Team 2001; Carol Witham and Jennifer Buck 2001-4-30 158 Colusa 2 mi. south of the town of Colusa along Hwy 20, east of Hwy 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001, UTMs: 10S0587786; 4336302. Comment
  RSA0096943  Crassula connata R. R. Halse 2010-3-20 7827 Colusa Williams. By junction of 5th Street and B Street. 25 Comment
  SEINET8194448  Crassula connata R. R. Halse 2010-3-20 7827 Colusa Williams, junction of 5th Street and B Street 25 Comment
  UC75673  Crassula connata var. erectoides Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  JEPS86621  Crepis L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-19 6701 Colusa 0.5 km w Summit Springs (sw flank of Snow Mountain); Snow Mountain 1500 Comment
  CHSC32200  Crepis monticola James Jokerst 1980-8-8 1078 Colusa North Coast Ranges. Near Snow Mountain (West). Hillside. Comment
  JEPS15568  Crepis pleurocarpa G. Thomas Robbins with L. R. Heckard 1956-7-25 3713 Colusa slope above Dark Hollow Creek (a tributary of Middle Fork Stony Creek) (on s flank of mt., at lower edge of cirque between Snow Mt. West and Snow Mt. East); Snow Mt. East 1981 Comment
  POM66160  Cressa truxillensis Roxana Stinchfield 1916-7-11 143 Colusa Willaims Road at theTrough Comment
  UCD126230  Cressa truxillensis H. S. Yates 1936-8-14 6133 Colusa 3 miles south of Colusa. 15 Comment
  CHSC84955  Croton setiger Lowell Ahart 2003-10-23 10676 Colusa Along Squaw Creek, just south of East Park Reservoir, about 1/8 mile northwest of Sites Lodoga Road, about 1 mile north of Lodoga, about 21 miles west of Maxwell. 368 Comment
  JEPS120800  Crypsis alopecuroides Lowell Ahart 2013-10-1 19075 Colusa Strand of East Park Reservoir, about 2.5 air miles SE of Stonyford, about 2.5 miles NW of Lodoga, about 10 air miles NW of Sites. Comment
  CHSC113051  Crypsis schoenoides Lowell Ahart 2013-10-1 19076 Colusa Inner North Coast Range. Strand of East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  CHSC77404  Crypsis schoenoides Heidi West; Joyce Lacey-Rickert 1998-10-29 Colusa Vicinity of Antelope Valley and Sites. 109 Comment
  POM313219  Crypsis schoenoides H. L. Mason 1945-7-11 12642 Colusa Alkali plains near Butte Creek; Butte Lodge Outing Club, three miles above Colusa Comment
  SEINET12765117  Crypsis schoenoides Lowell Ahart 2006-8-9 13116 Colusa North side and under the bridge across Stony Creek, just north of Stonyford.; 0 347 Comment
  UC1259361  Crypsis schoenoides Barry Hammel 1976-8-5 427 Colusa e side of Hwy 45 near Colusa Golf Club 30 Comment
  CHSC115632  Crypsis schoenoides David Isle; Rhonda Isle 2014-9-27 2145 Colusa Northern Sacramento Valley foothills: W side East Park Reservoir, ~0.3 mi S of boatlaunch; within ~ 20 yards of normal lake edge in drying clay soil. (Gilmore Peak California: 10S -0541629E, 4355225N). 353 Comment
  CAS-BOT-BC190166  Crypsis vaginiflora H. S. Yates 1936-8-14 6131 Colusa 3 miles south of Colusa. 15 Comment
  POM198510  Crypsis vaginiflora Roxana Stinchfield 1916-7-11 466 Colusa Davis Tule, near Sycamore Slough. Comment
  POM313168  Crypsis vaginiflora H. L. Mason 1945-7-11 12643 Colusa Near Butte creek; Butte Lodge Outing Club, 3 miles above Colusa. Comment
  RSA126602  Crypsis vaginiflora H. S. Yates 1936-8-14 6131 Colusa Three miles south of Colusa. 15 Comment
  UC1131372  Crypsis vaginiflora H. S. Yates 1936-8-14 6131 Colusa 3 mi s Colusa; Colusa Quadrangle 15 Comment
  UCD59989  Crypsis vaginiflora H. S. Yates 1936-8-14 6131 Colusa 3 miles south of Colusa. 15 Comment
  HSC45712  Cryptantha affinis Sheila Logan 1978-4-22 77 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  SEINET4206983  Cryptantha clevelandii var. dissita D. W. McNeal 1982-5-2 2632 Colusa On a rd. bank above Hwy. #20 at the Lake-Colus Co. line.; 0 Comment
  UC79296 Image available Cryptantha excavata Katharine Brandegee Colusa Stites [Sites], Colusa Co. Comment
  HSC45735  Cryptantha flaccida M. Alcasas 1978-4-22 43 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  JEPS16202  Cryptantha flaccida Rimo Bacigalupi and Arthur Holmgren 1950-4-26 3168 Colusa 8 mi nw Maxwell (along road to Sites, canyon through first hills on extreme w edge of the Sacramento Valley); Sacramento Valley Comment
  JEPS81272  Cryptantha flaccida L. R. Heckard and J. C. Hickman 1982-7-5 5882 Colusa s of (slope below area) Summit Springs (s side of Snow Mt.); Snow Mt. 1500 Comment
  JEPS90300  Cryptantha flaccida Dean W. Taylor 1992-4-16 12408 Colusa on hillsides 0.4 mi due w from spillway into Little Stony Creek (East Park Reservoir); Inner North Coast Range, East Park Reservoir 411 Comment
  UCR206891  Cryptantha flaccida George K. Helmkamp, E. A. Helmkamp 2009-3-11 14362 Colusa Inner North Coast Range Foothills, along CA-20, 9.7 miles southwest of Williams, on the north side of Salt Creek 162 Comment
  UC971694  Cryptantha hispidula Leo F. Koch 1940-4-29 936 a Colusa near Colusa and Lake county line (along Highway 20, Williams Highway) Comment
  UCD163229  Cryptantha hispidula Craig D. Thomsen 2000-4-28 2532 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 1 mile west of Hwy 20/16 intersection. 345 Comment
  SEINET7883435 Image available Cryptantha hispidula Leo Koch 1940-1 936 a Colusa Serpentine hill near Lake and Colusa county line along Highway 20, Williams Highway Comment
  CHSC146  Cryptantha intermedia V. Holt 1935-5-17 Colusa Stonyford. Comment
  JEPS67655  Cryptantha intermedia W. L. Jepson 1932-5-8 16291 Colusa n of Stonyford 365 Comment
  RSA128429  Cryptantha intermedia Robert F. Hoover 1941-5-2 4984 Colusa Just east of Lake County line on Williams-Clear Lake Highway. Comment
  UC1212064  Cryptantha intermedia Ethel Crum 1938-5-8 2027 Colusa 3 mi n Leesville; Inner North Coast Range Comment
  UCD63120  Cryptantha intermedia Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4950 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20. 405 Comment
  UCR80860  Cryptantha intermedia G. Fred Hrusa 1993-5-2 10865 Colusa Frenzel Creek Research Natural Area, Mendocino National Forest. Point of ridge on south side of mouth of Frenzel Creek at confluence with Little Stony Creek. 450 Comment
  UCD37192  Cryptantha intermedia Beecher Crampton 1958-5-19 4820 Colusa Colusa County, 4-8 miles south of Lodoga, Little Stony Creek Canyon. Comment
  UC1051698  Cryptantha milobakeri Helen K. Sharsmith 1953-6-19 4279 Colusa 1 mi n Trough Springs (on Trough Springs Ridge); Inner North Coast Ranges, Mendocino National Forest 914 Comment
  UC763256  Cryptantha nemaclada R. F. Hoover 1938-4-24 3229 Colusa ridge between Venado and Leesville Comment
  UC78651  Cryptantha nemaclada Katharine Curran 1884-1 Colusa Comment
  UCR212290  Cryptantha torreyana Ellen Dean, Davis Botanical Society 2008-5-31 5008 Colusa West of I-5 at Maxwell, east slope of Goat Mountain, along Goat Mountain Road, Cedar Grove Campground 1312 Comment
  JEPS13746  Cupressus macnabiana Frank W. Gould 1939-4-8 631 Colusa 1.5 mi w of Colusa County line (on road to Lucerne) Comment
  RSA388860  Cupressus macnabiana Linda Bell 1975-4-20 63 Colusa Walker Ridge Road ca. 7 miles from the junction with State Highway 20 Comment
  UCD67007  Cuscuta californica var. californica Craig D. Thomsen 2008-5-23 2740 Colusa BLM Payne Ranch. Lands to the SW of Hwy 16/20 intersection. About 0.75 mile south of Hwy 20 (south of Destanella Flat), 2.5 miles west of Hwy 16. 520 Comment
  UCD81892  Cuscuta californica var. californica Ellen Dean; Bear Creek Ranch Grazing Committee 2009-6-19 5776 Colusa BLM Bear Creek (formerly Payne) Ranch. Lands to the SW of the junction of Hwys 16 and 20. SW of Roadkill Cafe near stock pond. 429 Comment
  RSA313623  Cycladenia humilis Brandegee 1892-6-23 s.n. Colusa Snow Mountain Comment
  CHSC32212  Cycladenia humilis var. humilis James Jokerst 1980-8-7 1063 Colusa North Coast Ranges. Near Snow Mountain (West). Comment
Read comments
Jun 8 2007
  UCD150721  Cycladenia humilis var. humilis Susan Harrison 2011-8-8 s.n. Colusa California, Colusa County. Snow Mountain. Along trail to Summit Basin. 1920 Comment
  UCD72464  Cynodon dactylon Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3798 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. Bank of Bear Creek near north end of bridge, west side of creek. 260 Comment
  UC1177894  Cynoglossum grande Peter M. Ray 1950-4-16 1731 b Colusa junction of N. Fork and Big Stony Creek (n. side of canyon) Comment
  CHSC112020  Cynoglossum grande David Isle 1977-4-5 2069 Colusa Mendocino National Forest. About 1.3 mile NE of Fouts Springon Upper Davis Flat. 493 Comment
  POM185713  Cyperus acuminatus Roxana Stinchfield 1916-7-11 465 Colusa Davis Tule, near Sycamore Slough. Comment
  UC837462  Cyperus acuminatus Roxana Stinchfield 1916-7-11 465 Colusa Davis Tule near Sycamore Slough Comment
  UCD141000  Cyperus acuminatus Herbert L. Mason; Verne Grant 1946-8-6 12969 Colusa 2.7 miles north of Colusa between Sacramento River and Butte Creek. Comment
  JEPS110388  Cyperus difformis Lowell Ahart 2006-8-9 13143 Colusa North side and just east of the bridge across Stony Creek, just north of Stonyford 347 Comment
  RSA40155  Cyperus difformis J. T. Howell 1944-7-18 19838 Colusa 3 miles west of Williams 30 Comment
  UC1100547  Cyperus difformis Herbert L. Mason and Verne Grant 1946-8-7 12983 Colusa 8 mi. n. Colusa (Butte Sink); Butte Sink Comment
  UC710614  Cyperus difformis John Thomas Howell 1944-7-18 19838 Colusa 3 mi. w. Williams 30 Comment
  UCD141015  Cyperus difformis P. B. Kennedy 1922-5-30 s.n. Colusa Cortena. Comment
  UCD141018  Cyperus difformis Herbert L. Mason; Verne Grant 1946-8-7 12983 Colusa 8 miles north of Colusa. Comment
  CHSC94430  Cyperus eragrostis Lowell Ahart 2006-8-22 13209 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UC1100527  Cyperus eragrostis Herbert L. Mason and Verne Grant 1946-9-5 13117 Colusa 1.6 mi. w. Williams (rd. to Lake Co.) Comment
  JEPS64102  Cyperus erythrorhizos W. L. Jepson 1929-10-1 15342 Colusa Maxwell 25 Comment
  UC1100515  Cyperus erythrorhizos Herbert L. Mason and Verne Grant 1946-8-13 13012 Colusa 2 mi. w. Colusa (on Williams hwy. by gridge); Butte Sink Comment
  UCD141054  Cyperus erythrorhizos H. L. Mason 1945-9-19 12724 Colusa 1 mile N of Colusa. Below causeway over Butte Sink spillway, E bank of Sacramento River. Comment
  RSA523855  Cyperus erythrorhizos W. L. Jepson 1929-10-1 15342 Colusa Maxwell 26 Comment
  UC1100663  Cyperus odoratus Herbert L. Mason 1945-9-19 12721 Colusa 1 mi. n. Colusa (e. bank of Sacramento R., below causeway over Butte Sink spillway); Sacramento R. Comment
  POM313066  Cyperus strigosus S. Galen Smith 1949-9-9 1871 Colusa Rice fields 3 miles west of Williams Comment
  JEPS120794  Cypselea humifusa Lowell Ahart 2013-10-1 19073 Colusa Strand of East Park Reservoir, about 2.5 air miles SE of Stonyford, about 2.5 miles NW of Lodoga, about 10 air miles NW of Sites. Comment
  CAS-BOT-BC445505  Damasonium californicum J. Clausen 1935-5-20 1017 Colusa Ca. 27 mi. W. of Williams after passed the Wilbur Springs road. Along Bear Creek Comment
  CAS-BOT-BC445506  Damasonium californicum J. Clausen 1935-5-20 1017 Colusa Ca. 27 mi. W. of Williams after having passed the Wilbur Springs road. Along Bear Creek Comment
  CAS-BOT-BC445507  Damasonium californicum J. Clausen 1935-5-20 1017 Colusa Ca. 27 mi. W. of Williams after having passed the Wilbur Springs road. Along Bear Creek Comment
  POM208489  Damasonium californicum H. M. Hall 1916-8-10 10265 Colusa Sacramento Valley. Comment
  POM231094  Damasonium californicum Jens Clausen 1935-5-20 1017 Colusa Ca. 27 mi W of Williams after having passed the Wilbur Springs road. Along Bear Creek. Comment
  RSA91938  Damasonium californicum Beecher Crampton 1953-4-29 1148 Colusa 7 miles E of Maxwell. Comment
  CDA20254  Datisca glomerata G. D. Barbe, Nola Parmer 1982-6-4 3636 A Colusa North Coast Ranges; Goat Mountain Road 8.7 mi w of Ladoga-Stonyford Rd, along Little Stony Creek, 1.2 mi w of Little Stony Creek bridge. Stonyford Ranger District, Mendocino National Forest. 0 Comment
  CDA41123  Datura ferox F. F. Swim 1959-6-18 2919 Colusa 0 Comment
  JEPS120797  Datura stramonium var. tatula Lowell Ahart 2013-10-1 19083 Colusa Strand of East Park Reservoir, about 2.5 air miles SE of Stonyford, about 2.5 miles NW of Lodoga, about 10 air miles NW of Sites. Comment
  CHSC94514  Datura wrightii Lowell Ahart 2006-8-22 13205 Colusa At the intersection of Sites Lodoga Road and a dirt road to Elk Creek, about 1 1/2 miles (air) east of East Park Reservoir, about 4 1/2 miles (air) northeast of Lodoga. 545 Comment
  RSA724817  Datura wrightii L. Ahart 2006-8-22 13205 Colusa At the intersection of Sites Lodoga Road and a dirt road to Elk Creek, about 1.5 miles (air) east of East Park Reservoir, about 4.5 miles (air) northeast of Lodoga. 546 Comment
  JEPS81326  Daucus pusillus L. R. Heckard and J. C. Hickman 1982-7-6 5941 Colusa ca. 1/2 mi. n.e. Summit Springs (e. of trail, s. side Snow Mt.); Snow Mt. 1645 Comment
  JEPS81344  Delphinium antoninum L. R. Heckard and J. C. Hickman 1982-7-7 5957 Colusa Middle Fork of South Fork of Stony Creek Snow Mt. (originating in Veratrom Meadow before Milk Ranch) 1935 Comment
  HSC86893  Delphinium hesperium Pat Daly, Rudy Galindo 1988-4-17 58 Colusa 5.2 mi. S of Bear Valley Rd. 390 Comment
  UCD163887  Delphinium hesperium Craig D. Thomsen 2002-4-12 2439 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 1 mile west of Hwy 20/16 instersection. Comment
  CAS-BOT-BC10226  Delphinium hesperium Clinton Hart Merriam s.n. Colusa Indian Rancheria, Stony Ford Comment
  CAS-BOT-BC238187  Delphinium hesperium subsp. pallescens Roman Gaukin 1958-5-4 s.n. Colusa Bear Valley Comment
  UC1607881  Delphinium hesperium subsp. pallescens C. G. Nast 1936-4-17 144 Colusa Williams to Lake county Highway Comment
  UCD64411  Delphinium hesperium subsp. pallescens Craig D. Thomsen 2000-4-12 2138 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  HSC45441  Delphinium hesperium subsp. pallescens M. Alcasas 1978-4-23 58 Colusa Bartlett Springs Rd., 0.5 mi. from junction with Bear Valley Rd 457 Comment
  HSC87027  Delphinium hesperium subsp. pallescens Terry Hines, Ellen Purcell, N. Williams 1988-4-16 55 Colusa 4.2 mi. W on Goat Mtn. Rd., along Stony Creek 0.5 mi. W of Digger Pine Campground 450 Comment
  JEPS6254  Delphinium hesperium subsp. pallescens W. L. Jepson 1932-5-7 16261 Colusa Venado (2 mi. above, in a little valley), Southwestern Colusa County 304 Comment
  HSC25000  Delphinium nudicaule M. Dole 1963-4-15 60 Colusa 7 mi. S of junction of Hwy. 16 and Hwy 20 on Hwy. 16 Comment
  HSC72154  Delphinium patens J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9567 Colusa Bear Valley Rd., 2.1 mi. from its junction with Hwy. 20 366 Comment
  CHSC46049  Delphinium variegatum June McCaskill 1962-5-2 651 Colusa Ca. 200 yards west of road; on road along Bear Creek from State Highway 20 north to Leesville, 3.6 miles north of Wilbur Springs turnoff. Comment
  UCD163691  Delphinium variegatum Craig Thomsen 1999-4-27 1993 Colusa Bear Valley. About 6 miles north of Hwy 20, west of Bear Valley Rd. Comment
  POM174567  Delphinium variegatum Roxana S. Ferris 1926-4-23 6582 Colusa 2 miles from Stony Ford. Comment
  UCD14295  Delphinium variegatum R. Schulhof 1984-4-21 10 Colusa Colusa Co.; 9.8 miles north of Highway 20 on the east side Bear Valley Road; 381 Comment
  UCD15287  Delphinium variegatum Claire Warshaw 1985-4-13 7 Colusa along Bear Valley Road, 8 miles norhtwest from intersection with highway 20; 390 Comment
  UCD15434  Delphinium variegatum Lisa Montang 1985-4-13 4 Colusa Colusa Co.; Bear Valley, 8.6 miles north of Wilbur Springs Road and Highway 20 intersection; 390 Comment
  CHSC86016  Delphinium variegatum subsp. variegatum Jenny Marr; H. West, J. Lacey, C. Warren, N. Wight 1998-4-14 Colusa Vicinity of Grapevine Creek, Antelope Valley, and Sites-Lodoga Road. 137 Comment
  CHSC89827  Delphinium variegatum subsp. variegatum B. Castro; L. Janeway 2001-5-2 1244 Colusa Vicinity of Grapevine Creek, Antelope Creek, and Pence Mtn. In flat to undulating open grazed grassland between hills of blue oak woodland. Adjacent to dirt road paralleling N-S-trending creek. 335 Comment
  HSC87075  Delphinium variegatum subsp. variegatum L. Blackford, S. Branch, D. Malm 1988-4-17 77 Colusa 1.3 mi. S of Bear Valley Rd. from corner of Brim Rd. and Bear Valley Rd. Comment
  UCD57456  Delphinium variegatum subsp. variegatum Ellen Dean; W. Murray, J. Alderson, B. Weiss, M. Starbuck 2007-4-7 3640 Colusa Payne Ranch (owned by BLM), lands just west of Hwy 16, about 2 road miles south of junction of Hwy 20 and Hwy 16. 308 Comment
  SEINET3927152  Deschampsia cespitosa Fred W. Hoffman 1944-7-13 1949 Colusa Between Indian and Bear valleys, western.; 0 Comment
  JEPS82284  Deschampsia cespitosa subsp. cespitosa Roger Raiche 1982-3-20 20245 Colusa Walker Ridge Comment
  CAS-BOT-BC192672  Deschampsia danthonioides A. A. Heller 1902-5-1 5435 Colusa Near College City Comment
  CHSC107946  Deschampsia danthonioides B. Castro; L. Janeway 2011-4-27 1867 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 5 air mi NW of Maxwell, 0.8 mi southeast of Funks Reservoir and 0.3 mi northeast of Tehama-Colusa Canal. At SW end of vernally moist swale which extends northeast of large +- saline/alkaline wetland/ marsh, in drying vernal pool bottom. 48 Comment
  CHSC85968  Deschampsia danthonioides Jenny Marr; Heidi West, Joyce Lacey-Rickert, Caroline Warren 1998-5-8 Colusa Vicinity of Sites and Antelope Valley. 91 Comment
  UCD163856  Deschampsia danthonioides Craig D. Thomsen 2001-4-26 2483 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCD82860  Deschampsia danthonioides Gordon Harrington 2008-4-13 71 Colusa BLM Payne Ranch. Just SW of the Hwy 20-Hwy 16 intersection, SW of the corral. 324 Comment
  UCR212334  Deschampsia danthonioides Craig D. Thomsen 2000-4-12 2163 Colusa Bear Creek Botanical Management Area. Roadside shoulder of Hwy 20 (south side), 0.5 mi west of Hwy 20/16 intersection, (c. 0.3 mi. east of Hwy 20 'Vista Point'). 345 Comment
  JEPS75036  Deschampsia elongata L. R. Heckard 1972-7-10 3109 Colusa Trout Creek crossing of trail to Box Spring (Snow Mt.); Snow Mt. 1828 Comment
  JEPS75873  Deschampsia elongata L. R. Heckard 1974-9-9 3848 Colusa just s.e. of Foutch Camp (Snow Mt.); Snow Mt. 1920 Comment
  UC1950419  Deschampsia elongata Barbara Ertter 1989-7-1 8609 Colusa road to Goat Mt Lookout 1.7 mi S of Rt M-10 (Bear Creek-Fouts Spring Rd) at head of S Fk Stony Creek, ca 12 airmiles WSW of Stonyford; NE-facing slope Comment
  CAS-BOT-BC402210  Dicentra chrysantha A. A. Heller 1940-6-5 15713 a Colusa Near the foot of the grade east of Lodogo, on the Lodogo-Sites road Comment
  CHSC110819  Dicentra chrysantha David Isle; Rhonda Isle 2013-5-19 2040 Colusa Mendocino National Forest - North Coast Ranges Little Stony Creek Watershed. 0.1 mi W of Maxwell Grade Summit; Burned NW asp. S of Sites Lodoga Road. 548 Comment
  SEINET12103160  Dicentra formosa C. L. Abbott 1926-1 s.n. Colusa Colusa Comment
  UCR233440  Dichelostemma capitatum George K. Helmkamp, E. A. Helmkamp 2011-4-1 17128 Colusa Eastern Foothills North Coast Ranges, Antelope Valley, along Maxwell-Sites Road, 0.4 miles southeast of Sites 93 Comment
  CHSC81331  Dichelostemma capitatum subsp. capitatum J. Trizzino 2001-3-31 17 Colusa Bear Valley Meadow along east side of Bear Valley Road. 396 Comment
  HSC31395  Dichelostemma capitatum subsp. capitatum Maralyn O'Meara, Gary S. Lester 1974-5-4 350 Colusa Walker Ridge Rd., 0.7 mi. from junction with Little Indian Valley Rd. 854 Comment
  HSC31718  Dichelostemma capitatum subsp. capitatum Teresa Prendusi 1974-5-4 50 Colusa Beyond Clyde Mine 1/8 mi. 854 Comment
  HSC45714  Dichelostemma capitatum subsp. capitatum Sheila Logan 1978-4-2 69 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  SD72213  Dichelostemma congestum Eugene Memmler 1969-5-8 105 Colusa Between Williams and Clear Lake, Highway 20. Coastal valley hills. 152 Comment
  CAS-BOT-BC503139  Dichelostemma volubile David D. Keck 1933-5-30 2400 Colusa 1 mile east of Lake County line, west of Wilbur Springs, on south slope. Comment
  CHSC32197  Dieteria canescens var. shastensis James Jokerst 1980-8-8 1084 Colusa North Coast Ranges. Near Snow Mountain (west). Comment
  CAS-BOT-BC152171  Diplacus bolanderi A. A. Heller 1940-6-7 15720 Colusa Slope below the road on the Lodogo-Sites Road near the passing into low ground east of Lodogo Comment
  CHSC29758  Diplacus tricolor K. R. Stern 1980-5-5 6626 Colusa South central border area of Colusa National Wildlife Refuge. 45 Comment
  CHSC60689  Diplacus tricolor Vernon H. Oswald 1993-4-14 5263 Colusa N. side of O'Hair Rd., just E of the headquarters buildings, Colusa National Wildlife Refuge, SW of Colusa. 18 Comment
  CAS-BOT-BC208651  Distichlis spicata A. A. Heller 1902-5-19 5569 Colusa Near Colusa. Comment
  CHSC114987  Distichlis spicata Lowell Ahart 2015-5-5 20116 Colusa On the north side of Maxwell-Colusa Road, about 5 1/2 miles east of Maxwell. 53 Comment
  CHSC29761  Distichlis spicata K. R. Stern 1980-6-30 6647 Colusa Vernal pool, south central border area of Colusa National Wildlife Refuge. 45 Comment
  JEPS104128  Distichlis spicata Lowell Ahart 2003-8-15 10508 Colusa Rd (disked) that bordered a rice field, on the south side of Highway 20, ca 1 mi sw of Williams. 27 Comment
  UCD64348  Distichlis spicata var. stricta K. Esau 1932-6-29 Colusa Sutter Basin, near Colusa. Comment
  SEINET10831144  Distichlis spicata var. stricta A. Arthur Heller 1902-5-19 Heller 5569 Colusa Near Colusa. Comment
  UCD162980  Dodecatheon hendersonii Craig D. Thomsen 2002-2-7 2562 Colusa Bear Creek Botanical Management Area. Roadside shoulder of Hwy 20 (south side), about 1.2 miles west of Hwy 20/16 intersection, west end of large turnout. 345 Comment
  UCD56911  Dodecatheon hendersonii Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3514 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. In Craig Canyon. 318 Comment
  CHSC60673  Downingia insignis Vernon H. Oswald 1993-4-14 5264 Colusa N side of O'Hair Rd., just E of the headquarters buildings, Colusa National Wildlife Refuge, SW of Colusa. 18 Comment
  JEPS18023  Downingia insignis George B. Rossbach 1955-4-9 512 Colusa 3 mi e Maxwell; Sacramento Valley 18 Comment
  UC1609312  Downingia insignis Vernon H. Oswald and Lowell Ahart 1993-5-27 5428 Colusa ca 0.5 mi nw Sites (Sites-Lodoga Rd, Sacramento Valley); Sacramento Valley 121 Comment
  UC76662  Downingia insignis Miss M. Alice King 1905-1-1 Colusa near College City; Sacramento Valley Comment
  UCD18837  Downingia insignis Vernal Pool Team 2001; Carol Witham and Jennifer Buck 2001-4-30 144 Colusa 2 mi. south of the town of Colusa along Hwy 20, east of Hwy 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001, UTMs: 10S0587786; 4336302. Comment
  UCD55041  Downingia insignis Herbert L. Mason 1953-4-5 14506 Colusa Three miles east of Maxwell. Comment
  UC2048629  Downingia pulchella Lisa Schultheis with Ewald Weber 1995-6-3 203 -95 Colusa Bear Valley. Comment
  CAS-BOT-BC159697  Drymocallis glandulosa var. glandulosa H. H. Keifer 1928-5-2 s.n. Colusa North Peak, Marysville Buttes Comment
  UCD81238  Dudleya cymosa Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5402 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Edge of Bear Creek, near mouth of canyon located to the south of Brophy Canyon. 223 Comment
  CHSC113133  Dysphania ambrosioides Lowell Ahart 2013-10-1 19088 Colusa Inner North Coast Range. Strand of East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  JEPS120799  Dysphania ambrosioides Lowell Ahart 2013-10-1 19088 Colusa Strand of East Park Reservoir, about 2.5 air miles SE of Stonyford, about 2.5 miles NW of Lodoga, about 10 air miles NW of Sites. Comment
  CHSC112645  Dysphania botrys Lowell Ahart 2013-10-1 19087 Colusa Inner North Coast Range. Strand of East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  JEPS120637  Dysphania botrys Lowell Ahart 2013-10-1 19087 Colusa Strand of East Park Reservoir, about 2.5 air miles southeast of Stonyford, about 2.5 miles northwest of Lodoga, about 10 air miles northwest of Sites. Comment
  CHSC94418  Echinochloa crus-galli Lowell Ahart 2006-8-22 13215 Colusa South side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford. 349 Comment
  UC1100257  Echinochloa crus-galli Malcolm A. Nobs and S. Galen Smith 1949-9-9 1874 Colusa 3 mi w Williams; w of Williams Comment
  UCD60930  Echinochloa crus-galli P. B. Kennedy 1928-9-15 Colusa Cortena. Rice station. Comment
  UCD61166  Echinochloa oryzicola var. mutica P. B. Kennedy 1928-9-15 Colusa Rice Station, Cortena. Comment
  UCD61169  Echinochloa oryzoides Hursh 1919-11-12 X 3342 Colusa Williams. Comment
  UCD61179  Echinochloa oryzoides Beecher Crampton 1963-9-9 6893 Colusa 1/4 mile E of Cortena. Comment
  UCD137951  Echinodorus berteroi C. F. Dunshee 1922-1 3 Colusa Cortina. Comment
  CAS-BOT-BC291140  Eclipta prostrata Herbert L. Mason 1945-9-19 12725 Colusa Below causway over Butte Sink spillway, east bank of Sacramento River, 1 mile north of Colusa Comment
  UC1192126  Eclipta prostrata Herbert L. Mason 1945-9-19 12725 Colusa below causeway over Butte Sink spillway, e bank of Sacramento River, 1 mi n Colusa; Sacramento River, Butte Sink spillway Comment
  UCD131244  Eclipta prostrata H. L. Mason 1945-9-19 12725 Colusa 1 mile N of Colusa. Below causeway over Butte Sink spillway, E bank of Sacramento River. Comment
  HSC60471  Ehrendorferia chrysantha J. P. Smith 1977-4-24 9038 Colusa Along Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  UCD95151  Ehrendorferia chrysantha K. Esau 1934-5-5 s.n. Colusa above Williams, Tahoe-Ukiah Highway. Comment
  UC1101544  Elatine ambigua Malcolm A. Nobs and S. Galen Smith 1949-9-10 1892 Colusa 17 mi n Knights Landing (rice fields) Comment
  UC1245141  Elatine ambigua June McCaskill 1954-8-9 357 Colusa ca 2 mi e Princeton (300 yards s of Glenn Co. line) Comment
  UCD66936  Elatine rubella Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5085 -a Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western side of ranch along trail that follows the border of Lake and Colusa counties. Dunsfield Flat stock pond. 628 Comment
  CAS-BOT-BC113364  Eleocharis engelmannii Malcom A. Nobs; Stanley Galen [S. Galen] Smith 1949-7-18 1006 Colusa West of Williams, 2.5 miles. Comment
  CHSC79049  Eleocharis macrostachya J. Marr; C. Warren, H. West 1998-7-1 Colusa West of Maxwell, vicinity of Logan Ridge and Funks Creek, in vernal pool in narrow valley bottom west of ridge. 106 Comment
  SD225710  Eleocharis macrostachya Carol Witham, Jennifer Buck 2001-4-30 156 Colusa 2 miles south of the town of Clusa alng Hwy 20, east of Hwy 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001 Comment
  UCD57106  Eleocharis macrostachya Gordon Harrington; Diana Hickson 2007-4-7 0026 Colusa Colusa Co. Ca. BLM Payne Ranch, SW intersection of Hwy 16 and Hwy 20, .25 m NW of Roadkill Cafe. 427 Comment
  UCD163346  Eleocharis parishii Craig D. Thomsen 2000-5-11 2352 Colusa Walker Ridge. Buck Flat. 129 Comment
  UCD61458  Eleocharis parishii Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3904 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1 mile SW of parking lot. 390 Comment
  UCD61526  Elymus elymoides Helen K. Sharsmith 1953-6-19 4267 Colusa Near confluence of North and Middle forks of Stoney Creek, Red Bridge Camp, Mendocino National Forest. 548 Comment
  UCD61690  Elymus elymoides subsp. californicus D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley. Destanella Flat-Walker Ridge. 450 Comment
  UC1055953  Elymus elymoides subsp. elymoides Helen K. Sharsmith 1953-6-19 4267 Colusa Red Bridge Camp Inner North Coast Ranges, Mendocino National Forest (near confluence of North and Middle Forks of Stoney Creek) 548 Comment
  CHSC100289  Elymus glaucus D. Isle 1988-4-13 1514 Colusa Mendocino National Forest - North Coast Ranges. Middle Fork Stony Creek Watershed. Mellow-D Ranch meadow just north of 1st bad erosion channel in area burned during 1987 Fouts Fire. 731 Comment
  CHSC94631  Elymus glaucus subsp. glaucus Lowell Ahart 2006-6-11 12671 Colusa On the east side of an off road trail (Trail 30), about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford. 613 Comment
  JEPS75758  Elymus glaucus subsp. glaucus L. R. Heckard and R. Bacigalupi 1976-9-6 4441 Colusa just e Fouts Camp; Snow Mtn. 1859 Comment
  UCD72393  Elymus glaucus subsp. glaucus Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5119 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Southwestern part of ranch, upslope of confluence of Bear and Cache Creeks. Along old hunting camp road southeast (downslope) of junction with ridge trail. 384 Comment
  JEPS76114  Elymus multisetus W. L. Jepson 1938-6-11 18989 Colusa 4 mi se Wilbur Springs; Bear Creek Comment
  UCD67001  Elymus multisetus Craig D. Thomsen 2008-5-23 2738 Colusa BLM Payne Ranch. 0.5 mile south of Hwy 20 (south of Destanella Flat), about 2.5 miles west of Hwy 16. 542 Comment
  UCD84516  Elymus trachycaulus Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6067 Colusa Colusa County. On Lake County border. Walker Ridge. Along Walker Ridge Road. Buck Flat. 872 Comment
  JEPS110251  Elymus trachycaulus subsp. trachycaulus Lowell Ahart 2006-6-11 12671 Colusa On the east side of an off road trail (Trail 30), about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford 613 Comment
  HSC48169  Emmenanthe penduliflora Thomas W. Nelson, Jane P. Nelson 1978-4-29 3933 Colusa Along Bear Valley Rd., 2 mi. from the junction with State Route 20. 366 Comment
  UC1051707  Emmenanthe penduliflora Helen K. Sharsmith 1953-7-1 4406 Colusa Trough Springs Ridge; Inner North Coast Ranges, Mendocino National Forest 609 Comment
  UC1609171  Emmenanthe penduliflora Vernon H. Oswald and Lowell Ahart 1993-5-27 5431 Colusa Sites-Lodoga Rd. ca. 0.4 mi W of Grapevine Pass (4.6 rd mi e of Lodoga) 481 Comment
  CDA40328  Emmenanthe penduliflora D. Brown 1974-8-8 s.n. Colusa Mendocino National Forest, Stonyford. 0 Comment
  UCD63620  Emmenanthe penduliflora Craig D. Thomsen 2000-6-12 2370 Colusa BLM Payne Ranch. Southwest of intersection of Hwy 16 and Hwy 20. Between Cache Creek Ridge and Brophy Canyon, about 5 miles south of Hwy 20 and 1.5 miles west of Hwy 16. 321 Comment
  JEPS110405  Epilobium brachycarpum Lowell Ahart 2006-8-22 13218 Colusa South side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford 349 Comment
  UCD105385  Epilobium brachycarpum P. B. Kennedy 30-31 May 1922 s.n. Colusa Near Colusa. Comment
  UCD81239  Epilobium canum Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5403 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Just west of the mouth of canyon (inside the canyon) that is located south of Brophy Canyon. 266 Comment
  JEPS75838  Epilobium canum subsp. latifolium L. R. Heckard 1974-9-11 3954 Colusa along Summit Springs trail Snow Mt.; , Summit Springs trail 1737 Comment
  JEPS75755  Epilobium ciliatum subsp. glandulosum L. R. Heckard and R. Bacigalupi 1976-9-6 4437 Colusa trail crossing Snow Mt., Trout Creek 1828 Comment
  JEPS110108  Epilobium densiflorum Lowell Ahart 2006-8-9 13140 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  JEPS75736  Epilobium densiflorum L. R. Heckard 1974-9-9 3878 Colusa about 1/4 mi e Foutch Camp 1828 Comment
  CHSC115385  Epilobium minutum Lowell Ahart 2015-4-1 19998 Colusa Near a small drainage, burned over in 2012, rocky serpentine outcrop on the north side of State Highway 20, 1/2 mile east of Lake County Line, 12 miles (air) east-northeast of Clear Lake (town), 17 miles (air) west of Williams. Inner Coast Range. 520 Comment
  CHSC94885  Epilobium minutum Lowell Ahart 2006-6-11 12679 Colusa On the east side of an off road trail (Trail 30), about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford. 613 Comment
  JEPS124235  Epilobium minutum Lowell Ahart 2015-4-1 19998 Colusa Inner North Coast Range. 1/2 mile east of Lake County Line, 12 miles (air) east-northeast of Clear Lake (town), 17 miles (air) west of Williams. Comment
  UC638657  Epilobium minutum Ethel Crum 1938-5-8 2026 Colusa 3 mi n Leesville; Inner North Coast Range Comment
  CHSC94473  Epilobium torreyi Lowell Ahart 2006-8-9 13117 A Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS110233  Equisetum laevigatum Lowell Ahart 2006-8-22 13210 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  SD262162  Eragrostis hypnoides David Isle, Rhonda Isle 2014-9-27 2143 Colusa Sacramento Valley Foothills: west side East Park Reservoir, 0.3 mile south of boatlaunch. Drying lake bed, c 100 yds east of normal lake edge. 49 Comment
  UC188873  Eragrostis hypnoides H. P. Chandler 1905-9-14 Colusa Princeton Comment
  JEPS127604  Eragrostis hypnoides David Isle with Rhonda Isle 2014-9-27 2143 Colusa W side of East Park Reservoir, ca 0.3 miles S of boat launch, ca 100 yards E of normal lake edge. Comment
  UC17609  Eremocarpus setiger J. Burtt Davy May, 1898 4285 Colusa near Princeton Comment
  UCR261668  Eriastrum abramsii Ann Howald 2003-5-29 2345 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3.1 miles north of Lodoga, near shore of reservoir 370 Comment
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Dec 15 2016
  UCR261751  Eriastrum abramsii Ann Howald 2003-5-29 2350 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3.7 miles north of Lodoga, near Chisolm Cove Group Campground 378 Comment
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Dec 15 2016
  CHSC89854  Ericameria linearifolia B. Castro; L. P. Janeway 2001-4-18 1238 Colusa Vicinity of Grapevine Creek, Sites-Lodoga Road, and Scotties Spring. On edges of low terrace just above riparian corridor paralleling dirt road, adjacent to perennial N-S-trending creek. 268 Comment
  RSA589927  Ericameria linearifolia Michael A. Vincent, Robert Rhode 1996-3-30 7310 Colusa Along Walker Ridge Road, 11.5 miles S of junction with Brim Road Comment
  RSA14917  Ericameria linearifolia L. S. Rose 1934-3-13 34054 Colusa 2 miles E Clayton. Comment
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Jul 30 2014
  CAS-BOT-BC298294  Ericameria nauseosa var. speciosa Peter H. Raven 1959-9-11 14416 Colusa 0.5 mile S of Snow Mt 1920 Comment
  JEPS75829  Ericameria nauseosa var. speciosa L. R. Heckard 1974-9-9 3837 Colusa trail up from Summit Springs, Snow Mt., Colusa-Lake County line Snow Mt. 1645 Comment
  JEPS73515  Erigeron petrophilus var. petrophilus L. R. Heckard 1972-7-10 3133 Colusa overlooking and 3 mi nw Fouts Springs (se corner of Snow Mt.); Snow Mt. 1828 Comment
  JEPS80811  Erigeron petrophilus var. petrophilus L. R. Heckard and J. C. Hickman 1981-7-31 5784 Colusa e side Snow Mt. (rock promontory called Fouts Springs Overlook); , Fouts Springs Overlook 1798 Comment
  CHSC77302  Erigeron sumatrensis Heidi West; Joyce Lacey-Rickert 1998-10-29 Colusa Vicinity of Antelope Valley and Sites. 109 Comment
  CAS-BOT-BC216002  Eriodictyon californicum Roxana S. Ferris 1926-4-23 6431 A Colusa Near summit of grade on Williams - Stonyford Road Comment
  CAS-BOT-BC216004  Eriodictyon californicum L. Constance 1939-5-14 2488 Colusa Above Middle Fork of Stony Creek 2.5 miles east of Bonnie View, Inner North Coast Ranges 518 Comment
  CAS-BOT-BC216050  Eriodictyon californicum Roxana Stinchfield 1916-6-17 278 Colusa Cemetery, College City Comment
  RSA23083  Eriodictyon californicum Lincoln Constance 1939-5-14 2488 Colusa Above Middle Fork of Stony creek 2.5 miles E of Bonnie View, Inner N Coast Ranges 518 Comment
  RSA60348  Eriodictyon californicum G. R. Campbell 1948-6-18 649 Colusa 2 miles south of Wilbur Springs. Comment
  CHSC112641  Eriogonum dasyanthemum Lowell Ahart 2013-10-1 19066 Colusa Inner North Coast Range. Near a small drainage, north of the wash and State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  CHSC94726  Eriogonum dasyanthemum Lowell Ahart 2006-6-11 12680 Colusa On the east side of an off road trail (Trail 30), about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford. 613 Comment
  HSC94132  Eriogonum dasyanthemum G. Fred Hrusa 1998-10-28 14904 Colusa Along summit of Walker Ridge 900 Comment
  JEPS57027  Eriogonum dasyanthemum W. L. Jepson 1920-5-23 8962 Colusa grade above Venado Comment
  RSA0118881  Eriogonum dasyanthemum Lowell Ahart 2013-10-1 19066 Colusa Inner North Coast Range. North of the wash and State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  UCD13221  Eriogonum dasyanthemum Charles Martin 1986-5-17 28 Colusa California: Colusa Co. Along Sites-Lodoga Rd, 8.2 mi W of Sites. Comment
  UCR44922  Eriogonum dasyanthemum L. F. LaPre 1986-5-30 s.n. Colusa 1.5 mi west of Mendocino National Forest Boundary on Stony Creek Rd [c. 4 mi. west of Stonyford] 671 Comment
  CAS-BOT-BC242580  Eriogonum dasyanthemum James L. Reveal 1988-6-2 6985 Colusa Walker Ridge Road along the Lake County line, 3.3 miles north of the turnoff to Jordan Valley Dam and 0.2 mile south of the summit of the road, about 9 miles north of California Highway 20 and 7 miles south of the Bartlett Springs Road 1082 Comment
  RSA0115043  Eriogonum dasyanthemum Lyman Benson 1948-7-16 12922 Colusa Road between Williams and Clear Lake just east of Lake Co. line. Mt. Range: Inner North Coast. 548 Comment
  JEPS73500  Eriogonum luteolum var. luteolum L. R. Heckard 1972-7-10 3118 Colusa trail to Box Springs near Trout Creek crossing; Snow Mt., Trout Creek 1828 Comment
  UCR88380  Eriogonum luteolum var. luteolum Arthur M. Shapiro 1988-8-24 s.n. Colusa Mendocino National Forest, Near Glenn Co. line, at Goat Mtn Lookout, just below summit of Goat Mtn 1866 Comment
  CHSC32218  Eriogonum nervulosum James Jokerst 1980-9-6 1055 Colusa Near Snow Mountain (West). Comment
  UCD73924  Eriogonum nervulosum G. Ledyard Stebbins 1966-6-6 6433 Colusa Lovelady Ridge. Comment
  UCD55453  Eriogonum nudum Ellen Dean; Gordon Harrington 2006-10-6 3277 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 374 Comment
  CDA15552  Eriogonum nudum var. nudum G. F. Hrusa 1998-10-28 14903 Colusa North Coast Ranges; Cedar Camp Rd. as it enters Little Stony Ck. Cyn., approx. 1 mi. from Lodoga/Stonyford Rd. Comment
  UCD146700  Eriogonum nudum var. nudum G. F. Hrusa 1998-10-28 14903 Colusa Inner North Coast Ranges. Along Cedar Camp Road as it enters Little Stony Creek Canyon, approximately 1 mile from Lodoga/Stonyford Road. 400 Comment
  UCD100642  Eriogonum nudum var. nudum Arthur M. Shapiro 1988-8-24 s.n. Colusa near Glenn County Line, at Goat Mountain Lookout, just below summit of Goat Mountain. In Mendocino National Forest. 1865 Comment
  JEPS56620  Eriogonum nudum var. pubiflorum W. L. Jepson 1934-7-28 16750 Colusa hills se Cortina Valley Comment
  RSA7561  Eriogonum prattenianum Carl B. Wolf 1933-9-25 5497 Colusa 2 mi. W of Grass Valley on rd. to Rough and Ready. West slope of Sierra Nevada. Comment
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Oct 30 2012
  JEPS75856  Eriogonum spergulinum var. reddingianum L. R. Heckard 1974-9-10 3894 Colusa e ridge of East Peak, Snow Mt. Snow Mt. 2042 Comment
  CHSC92619  Eriogonum strictum var. greenei D. Isle 2005-8-1 1156 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. In the saddle and ridge top 1/3 mile South of Goat Mountain lookout. 1804 Comment
  UC1299713  Eriogonum tripodum Freed W. Hoffman 1947-6-19 1618 Colusa between Ladoga and Cook Springs Comment
  IRVC29686  Eriogonum umbellatum Mark A. Elvin, Mark S. Brunell, David Isle 2006-8-3 5032 Colusa Snow Mtn; Summit Spring Trail; 1.4km W of Snow Mtn West summit; 800m N of Cedar Camp. Southern Northern Inner Coast Ranges 1989 Comment
  CHSC101098  Eriogonum umbellatum var. bahiiforme D. Isle 2005-8-1 1155 Colusa In the saddle and ridge top 1/3 mile south of Goat Mountain Lookout, 1804 Comment
  UCR261723  Eriogonum umbellatum var. smallianum Ann Howald 2003-5-30 2357 B Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, peninsula c. 2 miles north of Lodoga, Big Boot camping area 365 Comment
  UCD57823  Eriophyllum lanatum Gordon Harrington 2007-4-17 34 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Destanella Flat, just south of Hwy 20, approximately 3.4 road miles west of the Hwy 16 intersection. 526 Comment
  UCR44912  Eriophyllum lanatum L. F. LaPre 1986-5-30 s.n. Colusa Stony Creek Rd, 2.2 mi. west of Mendocino National Forest boundary, NE of Clear Lake 678 Comment
  CDA15503  Eriophyllum lanatum var. achilleoides G. F. Hrusa, WTD 1998-6-19 14640 Colusa North Coast Ranges; Trough Springs ridge, immed. above (overlooking settlement) Fouts Springs. Comment
  UC896387  Eriophyllum lanatum var. achilleoides A. A. Heller 1916-6-6 12353 Colusa 3 mi w of Leesville (on open gravelly slopes); Coast Range Comment
  UCD67054  Eriophyllum lanatum var. achilleoides Craig D. Thomsen 2008-5-31 2760 Colusa BLM Payne Ranch. Lands to the SW of Hwy 20/16 intersection. Along Hwy 16, ca. 1 mile south of Hwy 20. Near Cowboy Camp. 0.25 mile west of Bear Creek and public viewing area. 305 Comment
  UCR233439  Eriophyllum lanatum var. achilleoides George K. Helmkamp, E. A. Helmkamp 2011-4-1 17127 Colusa Eastern Foothills North Coast Ranges, Antelope Valley, along Maxwell-Sites Road, 0.4 miles southeast of Sites 93 Comment
  SEINET10673292  Eriophyllum lanatum var. achilleoides Katherine L. Morris, Melvin L. Conrad; David B. Dunn 1973-6-6 Morris 375 Colusa Chaparral woodland and sparse oaks; on Hwy. 20, 0.3 mi. E of Lake County line. Comment
  UCD132205  Eriophyllum lanatum var. achilleoides Ted C. MacRae 1994-4-30 940430 -1 Colusa 1-1.5 miles northeast of junction of Hwys 20 and 16 along Bear Creek. Comment
  UCD70241  Eriophyllum lanatum var. grandiflorum D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley. Destanella Flat-Walker Ridge. 450 Comment
  UC35202  Erodium cicutarium J. Burtt Davy May 1898 4281 Colusa near Willows Comment
  UC73462  Erodium macrophyllum Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  SEINET8566769  Erodium moschatum Richard R. Halse 2001-3-22 5943 Colusa Williams, along vacant lot 455, 4th Street. 18 Comment
  UCR238747  Erodium moschatum George K. Helmkamp, E. A. Helmkamp 2012-2-9 18536 Colusa Sacramento Valley, River Road, 7.1 miles north of Colusa; east side of Sacramento River 18 Comment
  UCD82579  Eryngium aristulatum Craig Thomsen 2008-6-12 2769 Colusa Bear Creek (formerly Payne) Ranch. South side of Hwy 20, ca. 0.25 mi W of Hwy 16. West and SW of the corral that is located at the junction of Hwy 16 and 20. Comment
  UC1487274  Eryngium aristulatum var. aristulatum Yusuf Sheikh and Lincoln Constance 1973-5-12 542 Colusa s. Leesville (on Bear Valley Rd. toward Clear Lake, 1 mi. s. of Brim Rd., 13.3 mi. n. of State Hwy. 20) Comment
  CHSC107284  Eryngium vaseyi var. vallicola L. P. Janeway; B. Castro 2011-7-9 10506 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 1.5 km southeast of Funks Reservoir and 0.1-0.6 km northeast of Tehama-Colusa Canal. 50 Comment
  CDA12013  Erysimum capitatum G. F. Hrusa 1990-4-8 7665 Colusa North Coast Biodiversity Arena; Road into Bear Valley from the S, passing Wilbur Springs, and originating at Hwy. 20. Comment
  CDA21063  Erysimum capitatum G. F. Hrusa 1993-5-2 10856 Colusa North Coast Ranges; Frenzel Creek Research Natural Area, Mendocino National Forest. Mouth of Frenzel Creek, tributary of Little Stony Creek. Comment
  HSC71302  Erysimum capitatum var. capitatum Thomas W. Nelson, Jane P. Nelson 1979-4-12 4624 Colusa Along Stony Creek below Digger Pine Campground Comment
  CHSC94447  Erythranthe cardinalis Lowell Ahart 2006-8-9 13157 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  CHSC106250  Erythranthe microphylla B. Castro; L. P. Janeway 2001-6-3 1254 Colusa Inner North Coast Ranges. Spring near head of Doyle Canyon on east side of Walker Ridge, about 1.7 mi (air) south of Bartlett Springs Road. 798 Comment
  CAS-BOT-BC402661  Eschscholzia caespitosa Mrs. H. C. Cantelow 1936-4-11 s.n. Colusa Bear Creek Canyon Comment
  CHSC100950  Eschscholzia caespitosa Rodney Lacey 2008-4-1 Colusa Inner North Coast Ranges. Little Stony Creek; on private dirt road adjacent to Goat Mountain Road, near Lodoga-Stonyford Road, approximately 3.2 km west of Lodoga. 398 Comment
  UCD57300  Eschscholzia caespitosa Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3671 Colusa BLM Payne Ranch. Lands to the southwest of junction of Hwy. 20 and Hwy. 16. Thompson Canyon, near juncture with Craig Canyon. Above Thompson Creek. 366 Comment
  UCD82626  Eschscholzia caespitosa Craig Thomsen; G. Harrington 2009-5-12 2896 Colusa Colusa County on Walker Ridge: from spur road about 1/2 mile east of Walker Ridge Road, en route to Eaton Springs. 813 Comment
  RSA293185  Eschscholzia caespitosa subsp. caespitosa J. P. Smith, Tom Nelson, Jane Nelson 1978-4-2 9560 Colusa Bear Valley Road, 2.1 miles from its junction with State Route 20. 366 Comment
  JEPS51725  Eschscholzia californica Alice King June 1906 Colusa College City Comment
  CAS-BOT-BC402976  Eschscholzia californica A. A. Heller 1919-5-10 13115 Colusa Valley west of Leesville Comment
  CAS-BOT-BC402977  Eschscholzia californica A. A. Heller 1919-5-10 13115 Colusa Valley west of Leesville Comment
  CAS-BOT-BC402978  Eschscholzia californica Roxana S. Ferris 1917-4-14 603 Colusa 3 mi west of Arbuckle, Arbuckle - Rumsey Road Comment
  CAS-BOT-BC5884  Eschscholzia californica Townsend Stith Brandegee 1889-4-1 s.n. Colusa unspecified Comment
  UC85498 Image available Eschscholzia caruifolia K. Brandegee Apr 1889 Colusa Colusa County. Near Leesville. Comment
  CHSC42185  Eschscholzia lobbii S. A. Zaitz 1986-4-5 11 Colusa Ca. 0.3 mi w of jct. of Hwys 20 and 16, s side of Bear Ck, ca. 18 mi sw of Williams. 321 Comment
  CHSC115331  Euphorbia crenulata Lowell Ahart 2015-4-10 20011 Colusa In a small meadow, on the south side of Brim Road, about 2 miles west of the intersection of Bear Valley Road and Brim Road, about 17 miles (air) west of Williams. 500 Comment
  CHSC59969  Euphorbia spathulata J. M. Tucker 1978-5-6 4407 Colusa In field on east side of Bear Valley Road, 10.6 miles (by road) north of junction with State Highway 20. Valley floor of Bear Valley. 381 Comment
  SEINET4673877  Euphorbia spathulata Richard R. Halse 2013-3-27 8760 Colusa Along State Hwy. 20 just east of the Colusa/Lake county Line, ca. 14.6 miles east of the junction of State Hwys. 20 and 53.; 0 558 Comment
  SEINET5586425  Euphorbia spathulata Richard R. Halse 2013-1 8760 Colusa Along State Hwy. 20 just eat of the Colusa/Lake County Line, ca. 14.6 miles east of the junction of State Hwy. 20 and 53 558 Comment
  UCD58096  Euphorbia spathulata Ellen Dean; C. Thomsen, S. Bledsoe, G. Harrington, D. Hickson 2007-3-25 3473 Colusa BLM Payne Ranch. Lands to the southwest of the intersection of Hwy. 16 and Hwy. 20. Destinella Flat, just E of the Lake County Border. Ca. 3.4 miles along Hwy. 20 from junction of Hwy. 20 and Hwy. 16. 560 Comment
  UC71774  Euthamia occidentalis H. P. Chandler 1905-9-14 Colusa Princeton Comment
  UCD58122  Extriplex joaquinana Ellen Dean; PLB 102 Class 2007-4-29 3718 Colusa Payne Ranch. West of Hwy. 16. Ca. 2 road miles S of junction of Hwy. 20 and Hwy. 16. Near origin of Craig Canyon. 359 Comment
  CHSC111694  Festuca arundinacea David Isle; Rhonda Isle, Justin Isle 1988-5-22 2097 Colusa Middle Fork Stony Creek Watershed. Field S of Pendell home, S of Fouts Springs Rd 18N01 (M10), 2 miles W of Co. Rd. 306 jct. w/Fouts Springs Road. 384 Comment
  JEPS121258  Festuca microstachys var. ciliata Lowell Ahart 2013-5-1 18689 Colusa N of the wash and Hwy 20, just E of the Lake County line, 12.2 air miles ENE of the town of Clear Lake, 17.1 air miles W of Williams. Comment
  UCD72474  Forestiera pubescens Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3808 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. Bank of Bear Creek near south end of bridge, east side of creek. 252 Comment
  JEPS118616  Frangula californica subsp. crassifolia B. Castro, L. P. Janeway 1999-7-5 1014 Colusa Ca 11 air mi SSW of Stonyford, 5 mi NW of Indian Valley Reservoir, just N of Colusa/Lake Co line, at Bear Wallow Spring. In serpentine substrate on NNW-facing slope W of Lovelady Ridge Road ca 0.5 mi N of its junction with USFS Rd 16N06, 0.5 mi NE of Pacific Point. Hough Springs 7.5' quad. Comment
  UCD66952  Frangula californica subsp. crassifolia Ellen Dean; Davis Botanical Society 2008-5-31 4996 Colusa west of I-5 at Maxwell, along Goat Mountain Road following Little Stoney Creek, Little Stoney Creek Canyon. 414 Comment
  CAS-BOT-BC62917  Frangula californica subsp. tomentella C. Hart Merriam 1923-5-9 s.n. Colusa Stony Ford. Comment
  UCD112795  Frangula californica subsp. tomentella D. Sanchez-Mata 1998-7-9 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain Road between Lodoga and Red Rock Cabin. At Stoney Creek. 450 Comment
  CHSC107939  Frankenia salina B. Castro; Joe Silveira, Tom Boullion 2011-6-10 1886 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; approximately 1 mi southeast of Funks Reservoir and 0.2 mi northeast of Tehama-Colusa Canal. In swale about 400 ft north of large +- alkaline marsh; off edges of whitish alkali bald. 49 Comment
  CHSC46874  Frankenia salina Vernon Oswald 1989-9-12 4011 Colusa Maxwell-Colusa Rd 1.9 mi e of Maxwell, just w of Two-Mile Rd. On upper bank of roadside ditch. 33 Comment
  RSA123211  Frankenia salina H. S. Yates 1936-8-14 6135 Colusa 3 miles S. of Colusa 15 Comment
  UCD81898  Frankenia salina G. Harrington 2009-6-18 81 Colusa BLM Bear Creek (formerly Payne) Ranch. Lands to the SW of the junction of Hwys 16 and 20. S end of Cowboy Camp. E side of Bear Creek. 307 Comment
  UC1051743  Fraxinus dipetala Helen K. Sharsmith 1953-6-20 4299 Colusa Little Stoney Creek Inner North Coast Ranges, Mendocino National Forest 762 Comment
  UCD163233  Fraxinus dipetala Craig D. Thomsen 2000-4-12 2156 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 1 mile west of Hwy 20/16 intersection. 345 Comment
  CHSC62852  Fritillaria affinis Vernon H. Oswald; Lowell Ahart 1994-3-23 6013 Colusa Frenzel Creek Research Natural Area on the S side of Little Stony Creek, in the section on the E side of Frenzel Creek, S of Stonyford. 518 Comment
  UCSC010485  Fritillaria affinis Dylan M. Neubauer, Tim Forsell 2016-3-31 598 Colusa (NCoRI) Walker Ridge, Walker Ridge Road, 1.96 air-miles sse Cold Spring Mountain 820 Comment
  UCD139660  Fritillaria agrestis S. W. Winter 1927-3-9 751 Colusa Arbuckle. Comment
  SEINET12058445  Fritillaria atropurpurea M. A. Vincent, Rhode, R. 1996-1 Colusa Comment
  JEPS81409  Fritillaria glauca L. R. Heckard and J. C. Hickman 1982-7-9 6016 Colusa near junction of Horse Glade along road to Lookout, Goat Mountain Goat Mountain 1737 Comment
  CAS-BOT-BC130433  Fritillaria pluriflora James Jokerst 1985-4-10 2229 Colusa Near Walker Ridge Comment
  JEPS100637  Fritillaria pluriflora Dean W. Taylor 1992-4-16 12400 Colusa East Park Reservoir, ca. 0.4 mi due W from spillway into Little Stony Creek Inner North Coast Range 411 Comment
  JEPS89227  Fritillaria pluriflora W. Roderick 1964-3-22 Colusa 1/2 mi e of summit of Lake County Line (on Highway 20 (Williams-Clear Lake)); Highway 20 (Williams-Clear Lake) 304 Comment
  SJSU8654  Fritillaria pluriflora E. O. Haas 1956-3-21 Colusa Salt Cr area 10 mi SW of Arbuckle Comment
  UC765858  Fritillaria pluriflora R. F. Hoover 1939-3-5 3901 Colusa 2 mi s of Stonyford Comment
  UCD148574  Fritillaria purdyi G. Ledyard Stebbins 1985-5-19 C 531 Colusa Southeast of Goat Mountain peak. Pacific Point along Goat Rock Ridge, east of Goat Rock. (Exact location unknown; coordinates estimated by label maker. Note, Pacific Point at 3700 ft does not quite fall into Section 25.) 1127 Comment
  UCSC010483  Fritillaria purdyi Dylan M. Neubauer, Tim Forsell 2016-3-31 599 Colusa (NCoRI) Walker Ridge, Walker Ridge Road, 1.96 air-miles sse Cold Spring Mountain 820 Comment
  HSC59112  Fritillaria purdyi Terry Roth 1979-4-14 10 Colusa 1067 Comment
  CDA15495  Fritillaria recurva G. F. Hrusa, WTD 1998-6-19 14632 Colusa North Coast Ranges; N side of Goat Mtn. summit area. Comment
  JEPS120712  Galium andrewsii subsp. andrewsii Lowell Ahart 2013-10-1 19067 Colusa Near a small drainage, north of the wash and State Highway 20, just east of Lake County line, 12.2 air miles ENE of the town of Clear Lake, 17.1 air miles west of Williams. Comment
  JEPS121119  Galium andrewsii subsp. andrewsii Lowell Ahart 2013-5-1 18694 Colusa N of the wash and Hwy 20, just E of Lake County line, 12.2 air miles ENE of the town of Clear Lake, 17.1 air miles W of Williams. Comment
  UCD57662  Galium andrewsii subsp. andrewsii Hildegarde Durkin; with Plant Biology 102 2007-4-29 5 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central part of ranch. Thompson Canyon. North side of Thompson Creek. 377 Comment
  JEPS52810  Galium andrewsii subsp. intermedium Lauramay T. Dempster and G. L. Stebbins 1967-4-8 4357 Colusa 2.7 mi by road ne Lodoga (s-facing roadbank) 396 Comment
  CHSC62945  Galium aparine Vernon Oswald; Lowell Ahart 1994-4-6 6062 Colusa Goat Mtn. Rd. at Sullivan Creek, 1.2 mi SW of Digger Pine Flat, S of Stonyford. 469 Comment
  CDA14919  Galium bolanderi G. F. Hrusa 1993-5-2 10860 Colusa North Coast Ranges; Frenzel Creek Research Natural Area. Mendocino National Forest. Mid-canyon of Frenzel Creek. Comment
  JEPS75835  Galium bolanderi L. R. Heckard 1974-9-11 3952 Colusa along Summit Springs trail Snow Mt. 1798 Comment
  CHSC91041  Galium grayanum var. nanum D. Isle 2003-6-12 375 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. On Colusa/Lake County line, 1/8 mi. SE of Goat Mt. Lookout. 1841 Comment
  JEPS75849  Galium grayanum var. nanum L. R. Heckard 1974-9-10 3898 Colusa top of East Peak Snow Mt.; , top of East Peak 2133 Comment
  JEPS21477  Galium parisiense Francia Chisaki and Gene B. Newcomb 1958-6-19 1134 Colusa ca 3 mi w Stonyford (along path leading to the dam); Diversion Dam Camp Comment
  UC1177932  Galium parisiense Francia Chisaki and Gene B. Newcomb 1958-6-19 1134 Colusa about 3 mi w Stonyford (along path leading to dam); Diversion Dam Camp Comment
  SEINET11117450  Galium parisiense Unknown 1959-1 s.n. Colusa At Mill Creek crossing on road leading out of Red Bridge Camp, Colusa County. Comment
  UCD66527  Galium porrigens Craig D. Thomsen 2000-4-28 2228 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on north side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 2.80. Comment
  UCD121911  Galium porrigens var. tenue Elaine J. Imada 1971-4-10 15 Colusa East side of ridge; Bear Valley, Walker Ridge. Comment
  CHSC48888  Galium trifidum var. pacificum Vernon Oswald 1984-7-20 1615 Colusa Lily Pond N of Letts Lake in Mendocino National Forest. 1280 Comment
  CAS-BOT-BC199031  Garrya congdonii C. Hart Merriam 1907-7-23 s.n. Colusa Cook Spgs. Comment
  CDA12373  Garrya congdonii G. F. Hrusa 1996-1-2 12626 Colusa Inner North Coast Ranges; N side of Little Stony Creek, about 2 miles W of intersection of Cedar Camp Rd. and Stonyford-Lodoga Rd. Comment
  CHSC90682  Garrya flavescens D. Isle 1996-3-12 1010 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. Just west of Ruby King Mine. 426 Comment
  CHSC94472  Gastridium phleoides Lowell Ahart 2006-8-9 13171 A Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UC73425  Geranium carolinianum Miss M. Alice King 1905-1 Colusa near Arbuckle (near College City); Sacramento Valley Comment
  CHSC87237  Gilia clivorum B. Castro; Beth Hendrickson 2003-3-24 1399 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 310 Comment
  UC73637  Gilia clivorum Miss M. Alice King 1905-1 Colusa near College City (Sacramento Valley); , near College City Comment
  CHSC27514  Gilia tricolor Michael F. Henetz 1978-4-15 10 Colusa Field ca. 150 m s of Hwy. 20, ca. .5 km w of junction of Hwy. 20 and Hwy. 16, ca. 29 km s of Williams 322 Comment
  UCD64267  Gilia tricolor Craig D. Thomsen 2000-3-31 2065 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  HSC72769  Gilia tricolor J. Krajanowski 1981-4-4 4 Colusa .3 mi. W of junction of Hwy. 20 and Hwy. 16, S side of Bear Creek, 18 mi. SW of Williams 322 Comment
  SEINET12326985  Gilia tricolor Unknown 1984-1 7 Colusa ca 0.5 km W of jct of Hwys 20 and 16, S side of Bear Creek, ca 29 SW of Williams 322 Comment
  UCD14374  Gilia tricolor L. Coats 1983-4-24 11 Colusa Colusa Co.; in the hills at the south end of Bear Valley, along Bear Valley Road, 6.3 miles south of Bartlett Springs Road; 487 Comment
  JEPS121110  Gilia tricolor subsp. diffusa Lowell Ahart 2013-5-1 18684 Colusa N of the wash and Hwy 20, just E of Lake County line, 12.2 air miles ENE of the town of Clear Lake, 17.1 air miles W of Williams. Comment
  UC1614401  Githopsis Charles M. Belshaw 1937-4-25 2835 Colusa vicinity of Cook's Spring (Devil's Ridge); Inner N. Coast Range, Devil's Ridge Comment
  UC1051502  Githopsis diffusa subsp. robusta Helen K. Sharsmith 1953-6-19 4283 Colusa near Trough Springs (on Trough Springs Ridge); Inner North Coast Ranges, Mendocino National Forest 975 Comment
  CHSC79484  Githopsis specularioides B. Castro; L. P. Janeway 2000-5-4 1141 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 248 Comment
  HSC45716  Githopsis specularioides Sheila Logan 1978-4-22 61 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  HSC47647  Githopsis specularioides J. P. Smith, J. O. Sawyer 1978-4-29 9789 Colusa Just W of Walker Ridge Rd. intersection with Bartlett Springs Rd. Comment
  JEPS75872  Glyceria elata L. R. Heckard 1974-9-9 3874 Colusa se of Foutch Camp (just ne of rock promontory); Snow Mt. 1920 Comment
  CHSC77335  Glycyrrhiza lepidota Heidi West; Joyce Lacey-Rickert 1998-10-29 Colusa Vicinity of Antelope Valley and Sites. 109 Comment
  UCR225394  Gnaphalium californicum Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5099 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20. Western part of ranch along ridge trail at Cache Creek Canyon, just south of junction with trail that leads east to Brophy Canyon and Thompson Creek 495 Comment
  CHSC94475  Gnaphalium palustre Lowell Ahart 2006-8-9 13124 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  POM53847  Grindelia camporum Roxana Stinchfield 1916-7-11 455 Colusa Willaims Road at the 'Trough' Comment
  CAS-BOT-BC305303  Grindelia hirsutula Doris K. Kildale 1928-5-8 5018 Colusa 3 miles south of Arbuckle Comment
  JEPS113893  Grindelia hirsutula L. P. Janeway 2007-6-17 9059 Colusa Inner North Coast Ranges; Along Bear Valley Road and Bear Creek near Hwy 20. 325 Comment
  CHSC97316  Grindelia hirsutula var. davyi L. P. Janeway 2007-6-17 9059 Colusa Inner North Coast Ranges. Along Bear Valley Road and Bear Creek near Hwy 20. 325 Comment
  RSA0016943  Grindelia hirsutula var. davyi C. B. Wolf 1928-5-8 2126 Colusa 3 miles S of Arbuckle, Pacific Hwy. Comment
  UC71636  Guillenia lasiophylla Miss Alice King 1905-1 Colusa College City Comment
  CHSC91036  Hackelia micrantha D. Isle 2003-6-25 378 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. GPS: 10S 0524627E 4345811N. 1731 Comment
  UCD37194  Hainardia cylindrica Beecher Crampton 1958-5-19 4825 Colusa Colusa County, 4 miles south of Maxwell, along U.S. Highway 99W. Comment
  UCD70228  Hainardia cylindrica D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. Annual plant communities on serpentine temporal vernal pools. 370 Comment
  UCD86148  Hainardia cylindrica Beecher Crampton 1958-5-19 4825 Colusa Colusa County, 4 miles south of Maxwell, along U.S. Highway 99W. Comment
  UCD85235  Hainardia cylindrica D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. 370 Comment
  UCD135766  Harmonia hallii Bruce G. Baldwin 1986-4-13 599 Colusa 2.6 miles west of junction with Bear Valley Road along Bartlett Springs Road. Comment
  UCD159338  Harmonia hallii D. S. Park; E. Dean 2010-6-5 122 Colusa Walker ridge, Cold Spring Mt. Abundant by road. 692 Comment
  UCD82590  Harmonia hallii Craig D. Thomsen; J. Wiegand, S. Harrison, G. Harrington, A. Fulks 2008-4-22 2735 Colusa Walker Ridge. About 3.2 mi N of Hwy 20, adjacent to abandoned road leading back to Walker Ridge Rd. from 'Oak Cove. 822 Comment
  UCD83819  Harmonia hallii Ellen Dean; G. Harrington, K. Mawdsley, J. Shepard 2010-5-1 5966 Colusa Walker Ridge on border of Lake and Colusa Counties. Along Walker Ridge Rd., just E of Barrel Springs area. 721 Comment
  CDA34807  Harmonia hallii Peter Warner 2010-5-16 155 Colusa Walker Ridge Road, ~8.3 km N of jct. with Hwy. 20, ~1 km N of jct with Indian Valley Reservoir Rd., at road cut, both sides and adjacent slopes. Comment
  SACT000816  Heleochloa schoenoides Herbert Mason 1945-7-11 Colusa Alkali Plains three miles above Colusa. Comment
  UC194952  Helianthus bolanderi H. M. Hall 1916-8-16 10267 Colusa near Williams Comment
  UCD144347  Helianthus bolanderi G. F. Hrusa 1998-10-28 14897 Colusa Inner North Coast Ranges. Along Cedar Camp Road as it enters Little Stony Creek Canyon. Approximately 1/2 mile from Lodoga/Stonyford Road. 400 Comment
  UCD163650  Helianthus bolanderi Craig Thomsen 1998-6-10 1948 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCD61452  Helianthus bolanderi Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3897 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1/2 mile SW of parking lot. North of Eula Canyon. 420 Comment
  JEPS120804  Heliotropium curassavicum Lowell Ahart 2013-10-1 19096 Colusa Strand of East Park Reservoir, about 2.5 air miles SE of Stonyford, about 2.5 miles NW of Lodoga, about 10 air miles NW of Sites. Comment
  UC1552825  Heliotropium curassavicum Frederica Bowcutt 1985-5-20 527 Colusa 10 air miles w. Williams (n.e. of Wilbur Springs ca. 7 mi., along Hwy. 20 and Salt Creek) Comment
  JEPS104401  Helminthotheca echioides Lowell Ahart 2003-10-23 10661 Colusa Along Squaw Creek, just south of East Park Reservoir, ca 1/8 mi nw of Sites Lodoga Rd, ca 1 mi n of Lodoga, ca 21 mi w of Maxwell. 368 Comment
  UCD163661  Hemizonia congesta Craig Thomsen 1998-6-10 1958 Colusa Bear Valley. About 6 miles north of Hwy 20. Comment
  SD133786  Hemizonia congesta subsp. clevelandii L. R. Heckard, J. C. Hickman 1980-9-15 5418 Colusa Slopes west of Summit Springs, Snow Mountain. 1555 Comment
  UCD159329  Hemizonia congesta subsp. luzulifolia D. S. Park 2010-6-5 113 Colusa Colusa County.: Walker ridge, Cold Spring Mt. roadside, grassland. 781 Comment
  UCD160070  Hemizonia congesta subsp. luzulifolia Ellen Dean; Craig Thomsen and Davis Botanical Society 2015-4-25 8629 Colusa Bear Creek Ranch (previously Payne Ranch) at intersection of highways 16 and 20. Lynch Canyon near 'Bullfrog Pond. 384 Comment
  UCD55445  Hemizonia congesta subsp. luzulifolia Ellen Dean; Gordon Harrington 2006-10-6 3270 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 374 Comment
  UCD66696  Hemizonia congesta subsp. luzulifolia Craig D. Thomsen 2000-6-23 2384 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UCD72453  Hemizonia congesta subsp. luzulifolia Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3790 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. Near north end of bridge, west side of creek. 281 Comment
  UCD70224  Hemizonia luzulifolia D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. Annual grasslands growing on ultramafic soils. 370 Comment
  UCR261648  Hesperevax caulescens Ann Howald 2003-4-23 2314 Colusa Inner North Coast Ranges, Indian Valley, East Park Reservoir, Catholic Point peninsula, east of Coppermine Road, c. 1.1 mi north of intersection with East Ruby King Road 403 Comment
  CHSC83314  Hesperevax sparsiflora Jenny Marr; Heidi West, Joyce Lacey-Rickert, Caroline Warren 1998-5-8 Colusa Vicinity of Sites and Antelope Valley. 137 Comment
  SD40656  Hesperocyparis sargentii Carl B. Wolf, E. R. Johnson 1934-10-15 Colusa Cook Springs (western part of county) 550 Comment
  UCD82619  Hesperolinon Craig Thomsen; G. Harrington 2009-5-12 2887 b Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  CAS-BOT-BC175982  Hesperolinon californicum A. A. Heller 1916-6-6 12352 Colusa Coast Range on the grade about 3 miles west of Leesville Comment
  UC1212449  Hesperolinon californicum Helen K. Sharsmith 1953-6-17 4252 Colusa 1 mi n origin of Wilbur Springs road (near Hwy 20); Inner North Coast Ranges, Bear Creek drainage 365 Comment
  UCD66457  Hesperolinon californicum Craig D. Thomsen 2000-6-7 2362 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  UCD81215  Hesperolinon californicum Ellen Dean; K. Mawdsley, B. Rice, G. Harrington, and J. Alderson 2009-5-6 5552 Colusa Payne Ranch, lands to the SW of the jct. of Hwys. 16 and 20. Destinella Flat area on the S side of Hwy. 20. Top of ridge to the E of Destanella Flat. 578 Comment
  UCR200666  Hesperolinon californicum Craig D. Thomsen 2008-5-31 2759 Colusa BLM Payne Ranch, southwest of intersection between Hwy 16 and Hwy 20, Cowboy Camp farea on the west side of Hwy 16, 1 mile south of Hwy 20, 0.25 mi. west of public viewing area and Bear Creek Comment
  UCR261748  Hesperolinon californicum Ann Howald 2003-5-29 2347 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3.6 miles north of Lodoga, 0.1 mi south of Chisolm Cove Group Campground 385 Comment
  UCD110515  Hesperolinon didymocarpum D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley. Destanella Flat-Walker Ridge. 450 Comment
  CHSC83165  Hesperolinon disjunctum Beecher Crampton 1995-6-4 10323 Colusa Colusa-Lake County Border: State Highway 20. Comment
  CHSC88554  Hesperolinon disjunctum L. P. Janeway 2001-6-6 7128 Colusa Inner North Coast Ranges. Deadshot Spring; about 1.9 km (air) east of Walker Ridge Road. 716 Comment
  JEPS11966  Hesperolinon disjunctum Rimo Bacigalupi with G. T. Robbins 1954-6-25 4622 Colusa 0.1 mi e Lake County line (e of summit of road from Bear Valley to Indian Valley) 640 Comment
  UC1212470  Hesperolinon disjunctum Helen K. Sharsmith 1959-5-27 4692 Colusa hillslope just beyond Candy Bucket Springs (4 mi beyond Mill Creek on road to Stonyford); Inner North Coast Ranges 853 Comment
  UC1212487  Hesperolinon disjunctum Helen K. Sharsmith 1953-6-18 4253 Colusa ca one mi above Diversion Dam of Big Stony Creek (near road from Stoneyford to Fouts Springs); Inner North Coast Ranges, Mendocino National Forest; above Diversion Dam of Big Stoney Creek, Mendocino National Forest, Colusa Co. 518 Comment
  UC1212497  Hesperolinon disjunctum Helen K. Sharsmith 1951-7-13 4031 Colusa near Mill Creek at junction with road to Black Diamond Ridge; Inner North Coast Ranges, Mendocino National Forest, Fouts S 457 Comment
  OBI12541  Hesperolinon drymarioides Helen K. Sharsmith 1952-6-21 4159 Colusa Inner North Coast Ranges. North cyn slope overlooking Cook springs 549 Comment
  UC1212304  Hesperolinon drymarioides Helen K. Sharsmith 1952-6-21 4159 Colusa n canyon slope overlooking Cook Springs; Inner North Coast Ranges 548 Comment
  UC1212306  Hesperolinon drymarioides Freed W. Hoffman 1947-6-19 1616 Colusa serpentine slope on n side canyon directly adjacent to Cook Springs (at end of road, ca five mi sw of Ladoga by road); Inner North Coast Ranges Comment
  UCD66692  Hesperolinon micranthum Craig D. Thomsen 2000-6-23 2373 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UCD82742  Hesperolinon micranthum Craig Thomsen; G. Harrington 2009-5-14 2923 Colusa Colusa County on Walker Ridge: southeast of Methany flat. 579 Comment
  CHSC118362  Heteranthera dubia Dean Wm. Taylor 2014-5-18 21476 Colusa 3.5 miles southwest of Maxwell; eastern bank of the Glenn-Colusa Canal downstream of the crossing of Fairview Road. 35 Comment
  SEINET10460718  Heterocodon rariflorum Lawrence R. Heckard Heckard 2235 Colusa 6 MI W OF STONYFORD 1700 Comment
  HSC87080  Heteromeles arbutifolia Anthony J. Desch, Bryon Cariss 1988-4-16 35 Colusa 2 mi. W on Brim Rd. from corner of Brim Rd. and Bear Valley Rd. 518 Comment
  UCD55466  Heteromeles arbutifolia Ellen Dean; Gordon Harrington 2006-10-6 3291 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 362 Comment
  UCD72451  Heteromeles arbutifolia Ellen Dean; Gordon Harrington 2006-11-10 3312 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western part of ranch, along ridge trail above Cache Creek. 535 Comment
  UCR206401  Heteromeles arbutifolia George K. Helmkamp, E. A. Helmkamp 2009-3-11 14376 Colusa Inner North Coast Range Foothills, along CA-20, 14.3 miles southwest of Williams 375 Comment
  POM312312  Hibiscus H. L. Mason 1945-7-11 12649 Colusa Alkali plains near Butte Creek; Butte Lodge Outing Club, three miles above Colusa Comment
  RSA86288  Hibiscus lasiocarpos Verne Grant 1946-8-6 7837 Colusa Butte Creek, 1 mile north of Butte Outing Gun Club, near Colusa. Comment
  CHSC25319  Hibiscus lasiocarpos var. occidentalis Hayes; Warner, Schlising 1977-8-23 49 Colusa Along Putnam Rd., where this road reaches the Butte Creek Drainage, off of Gridley road 5. 50 Comment
  CHSC32210  Hieracium greenei James Jokerst 1980-8-7 1061 Colusa North Coast Ranges. Near Snow Mountain (west). Comment
  JEPS73513  Hieracium greenei L. R. Heckard 1972-7-10 3131 Colusa overlooking and 3 mi w of Fouts Springs (woods near promontory on se corner of mountain); Snow Mt. 1828 Comment
  SEINET10946628  Hippuris vulgaris Andrew Townesmith, Karen M. Meyer 2007-8-7 Townesmith 914 Colusa Mendocino National Forest, Grindstone Ranger District. Lily Pond, off Forest Service road 17N02, 1.7 miles SW ofinteresection with Forest Service route M10. T17N R8W S24. 1264 Comment
  UCD72479  Hirschfeldia incana Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3813 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. West side of Bear Creek, across from BLM parking lot that is located at south end of bridge. 249 Comment
  UCD164149  Hoita macrostachya Craig Thomsen 1997-6-21 1930 Colusa Bear Valley. About 8 miles north of Hwy 20. Comment
  CAS-BOT-BC383129  Holocarpha virgata subsp. virgata Andrew Townesmith; Karen M. Meyer 2007-8-7 907 Colusa Mendocino National Forest, Grindstone Ranger District. Vicinity of Wolf Creek OHV staging area, off Forest Service route M10, 4.2 miles west of intersection with Lodoga-Stonyford road in Stonyford 452 Comment
  RSA523605  Holocarpha virgata subsp. virgata Barbara Ertter, E. Neese, Laura Fujii, Dawn Espindola 1989-10-21 8875 Colusa NW side of East Park Reservoir near end of East Park Road form Stonyford. 366 Comment
  UC725605  Holocarpha virgata subsp. virgata A. A. Heller 1940-6-7 15721 Colusa road to Sites; Lodogo Comment
  CAS-BOT-BC152578  Holodiscus discolor var. discolor A. A. Heller 1916-6-6 12362 Colusa Coast Range on the grade about 3 miels west of Leesville Comment
  CHSC110423  Hordeum brachyantherum David Isle 1990-5-6 1982 Colusa Stony Creek Watershed. Pendell Ranch about 2 mi W of Co. Rd. 306 jct. with Fouts Springs Road; abt 150 yds south of Pendell home. 384 Comment
  UCD164138  Hordeum brachyantherum Craig Thomsen 1997-4-20 1927 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  CHSC112029  Hordeum brachyantherum David Isle; Rhonda Isle, Justin Isle 1988-5-22 2098 Colusa Mendocino National Forest, Pendell Ranch, S of Fouts Springs Rd 18N01 (M10), ~2 miles W of Co. Rd. ~150 yds south of Pendel home. 384 Comment
  UC1745700  Hordeum brachyantherum subsp. brachyantherum Annetta M. Carter, Sarah Dyal, Ethel Crum 1938-5-8 1391 Colusa 5.5 mi. S of Leesville. Bear Valley. 426 Comment
  CHSC112265  Hordeum depressum Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18637 Colusa Inner North Coast Range. North side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  POM198500  Hordeum depressum Roxana S. Ferris 1917-4-12 518 Colusa 4 miles east of Williams Comment
  UCD18853  Hordeum depressum Vernal Pool Team 2001; Carol Witham and Jennifer Buck 2001-4-30 161 Colusa 2 mi. south of the town of Colusa along Hwy 20, east of Hwy 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001, UTMs: 10S0587786; 4336302. Comment
  SEINET9320843  Hordeum jubatum Unknown 1998-7-9 Colusa Bear Valley Comment
  UCD163872  Hordeum marinum subsp. gussoneanum Craig D. Thomsen 2000-3-31 2173 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection. Comment
  UCD85779  Hordeum marinum subsp. gussoneanum A. A. Beetle 1942-5-21 3273 Colusa 12 miles north of Williams. Comment
  UCD57281  Hordeum murinum subsp. glaucum Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3649 Colusa BLM Payne Ranch. Mouth of Craig Canyon. Along unimproved road, about 2 road miles south of junction of Hwy 20 and Hwy 16. . 316 Comment
  UCD86536  Hordeum vulgare Beecher Crampton 1962-4-17 6216 Colusa Sycamore. Comment
  CHSC48848  Horkelia californica subsp. dissita Vernon Oswald 1984-7-20 1614 Colusa Lily Pond n of Letts Lake in Mendocino National Forest. On the edge of a meadow. 1280 Comment
  JEPS88739  Horkelia californica subsp. dissita Dean W. Taylor 1992-6-10 12696 Colusa Highway 162-Alder Springs Road ca 2 mi w from junction with Grindstone Road (Inner North Coast Ranges); Inner North Coast Ranges 1371 Comment
  SEINET10947309  Horkelia tenuiloba Andrew Townesmith, Karen M. Meyer 2007-8-7 Townesmith 915 Colusa Mendocino National Forest, Grindstone Ranger District. Lily Pond, off Forest Service road 17N02, 1.7 miles SW ofinteresection with Forest Service route M10. T17N R8W S24. 1264 Comment
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Aug 17 2018
  CHSC62925  Hornungia procumbens Vernon H. Oswald; Lowell Ahart 1994-4-6 6075 Colusa Goat Mtn. Rd. 0.3 mi S of Little Stony Creek Bridge, SW of Digger Pine Flat, SSW of Stonyford. Along a drainage. 548 Comment
  UCD66960  Hosackia crassifolia Ellen Dean; Davis Botanical Society 2008-5-31 5004 Colusa west of I-5 at Maxwell, east slope of Goat Mountain, along Goat Mountain Road. 1152 Comment
  UCD146730  Hosackia crassifolia var. crassifolia G. F. Hrusa 1998-6-19 14617 Colusa North Coast Ranges. Along USFS Pacific Ridge Road. (M5) Above intersection with Goat Mountain Road. 1120 Comment
  JEPS80063  Hydrophyllum occidentale L. R. Heckard and J. Hickman 1979-6-15 5069 Colusa saddle between e and w peaks Snow Mt. 2103 Comment
  JEPS80831  Hypericum formosum var. scouleri L. R. Heckard and J. C. Hickman 1981-8-1 5803 Colusa s. side Snow Mt. (lower Foutch Camp Meadow) 1844 Comment
  UCD110369  Hypericum perforatum subsp. perforatum Jack Booth 1973-6-14 s.n. Colusa State Highway 20, 2 miles west of junction with State Highway 16. Comment
  CHSC105470  Hypochaeris glabra Richard R. Halse 2007-3-25 7122 Colusa Along State Hwy. 20 ca. 7.8 miles northeast of its junction with State Hwy. 16, at base of Salt Canyon. 100 Comment
  UCD57109  Hypochaeris glabra Gordon Harrington; Diana Hickson 2007-4-7 0022 Colusa Colusa Co. Ca. BLM Payne Ranch, SW intersection of Hwy 16 and Hwy 20, approx. 1/5 to 1/2 mile W of Roadkill Cafe on old fuel break. 442 Comment
  UCD135955  Ibicella lutea Barry Rice 2012-6-11 BR 120601 Colusa near Hwy 20, 10 km west of I-5. 50 Comment
  CHSC71008  Iris macrosiphon Vernon Oswald; Lowell Ahart 1998-5-7 9008 Colusa Bartlett Springs Rd. 2.2 mi west of Bear Valley Rd., 0.7 mi east of Sawtelle Valley and Grapevine Flat roads. 524 Comment
  SEINET3875317  Iris macrosiphon Thomas E. Higley 1974-5-4 066 Colusa 3/4 miles north of T junction of Indian Valley.; 0 853 Comment
  JEPS80126  Iris tenuissima L. R. Heckard with J. Hickman 1980-7-1 5285 Colusa 10 mi w Stonyford (Summit Springs to Frog Lake, Snow Mt., Colusa-Lake County boundary); Snow Mt. 1706 Comment
  CHSC32202  Ivesia gordonii James Jokerst 1980-8-8 1076 Colusa North Coast Ranges. Near Snow Mountain (west). Comment
  CHSC79769  Juglans californica var. hindsii L. P. Janeway; Caroline Warren 2000-4-6 6660 Colusa Vicinity of Lurline Creek and Standard Road. 51 Comment
  UCD82635  Juglans hindsii Jack Alderson 2009-9-19 31 Colusa BLM Bear Creek (formerly Payne) Ranch. Lands to the SW of junction of Hwys 16 and 20. Along Bear Creek, SE of mouth of Craig Canyon. 304 Comment
  CHSC62909  Juncus balticus Vernon H. Oswald 1994-4-11 6104 Colusa Sacramento National Wildlife Refuge. Refuge located ca. 7 mi S of Willows, at the SW corner of Tract 39. 25 Comment
  CHSC84195  Juncus balticus Lowell Ahart 2003-7-14 10384 Colusa Along a stream, field on the south side of Highway 20, about 2 miles southwest of the intersection of Highway 20 and Bear Valley Road, about 21 miles (by road) southwest of Williams. 520 Comment
  CHSC71509  Juncus bufonius var. congestus Vernon H. Oswald; Lowell Ahart 1998-7-15 9305 Colusa West side of county on Walker Ridge Rd. 8.2 mi south of Bartlett Springs Rd., 6.3 mi north of Hwy. 20. In meadow. 792 Comment
  JEPS80259  Juncus covillei L. R. Heckard and J. Hickman 1980-9-15 5439 Colusa n of road at Summit Springs (Snow Mountain, Lake-Colusa County Boundary); Snow Mountain, Summit Springs 1524 Comment
  JEPS80246  Juncus effusus subsp. pacificus L. R. Heckard and J. Hickman 1980-9-15 5424 Colusa w of Summit Springs; Snow Mt. 1554 Comment
  RSA724953  Juncus ensifolius L. Ahart 2006-8-9 13145 Colusa North side and just east of the bridge across Stony Creek, just north of Stonyford 348 Comment
  JEPS75870  Juncus howellii L. R. Heckard and J. H. Thomas 1974-9-10 2890 Colusa s East Peak (upper reaches of creek); Snow Mt., Dark Hollow Creek 2011 Comment
  JEPS80271  Juncus howellii L. R. Heckard, and J. Hickman 1980-9-16 5454 Colusa e of West Peak (first meadow along trail from Frog Pond in cirque area); Snow Mt. 1981 Comment
  JEPS73502  Juncus laccatus L. R. Heckard 1972-7-10 3120 Colusa Trout Creek crossing of trail to Box Springs; Snow Mt. 1828 Comment
  UCD18851  Juncus mexicanus Vernal Pool Team 2001; Carol Witham and Jennifer Buck 2001-4-30 159 Colusa 2 mi. south of the town of Colusa along Hwy 20, east of Hwy 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001, UTMs: 10S0587786; 4336302. Comment
  UCD61460  Juncus mexicanus Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3906 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1 mile SW of parking lot. 390 Comment
  JEPS80257  Juncus occidentalis L. R. Heckard, and J. Hickman 1980-9-15 5435 Colusa n of Summit Springs (n side of road); Snow Mt. 1524 Comment
  CHSC97128  Juncus usitatus Lowell Ahart 2007-7-7 14258 Colusa South of the wire fence, on the south side of the Gridley Colusa Highway, about 1 1/4 miles east of River Road, about 17 miles west of Gridley. 20 Comment
  HSC100768  Juncus usitatus Lowell Ahart 2007-7-7 14258 Colusa S side of the Gridley-Colusa Hwy., ~1 1/4 mi. E of River Rd. and 17 mi. W of Gridley. 20 Comment
  UCD169280  Juncus usitatus Lowell Ahart 2007-7-7 14258 Colusa About 17 miles west of Gridley, About 1 1/4 miles east of River Road, on the south side of the Gridley Colusa Highway, south of the wire fence. 20 Comment
  JEPS118670  Juncus xiphioides L. P. Janeway and B. Castro 2011-5-19 10289 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 1.9 km southeast of Funks Reservoir and 0.2 km northeast of Tehama-Colusa Canal. Comment
  UC842993  Juncus xiphioides A. A. Heller 1916-6-9 12389 Colusa about 8 mi w Williams; Coast Range Comment
  UCR280794  Juncus xiphioides var. xiphioides David Isle 2014-6-7 2133 Colusa North Coast Range, c. 1 mile south of Stonyford, David and Rhonda Isle property. West bank of Salt Creek, just north of second curve north of bridge on Dennis Drive 366 Comment
  CAS-BOT-BC80913  Juniperus californica Roxana S. Ferris 1926-4-23 6456 Colusa 4 miles from Stanford on the Leesville Road Comment
  JEPS48304  Juniperus californica W. L. Jepson 1932-5-8 16298 Colusa n of Stonyford (w Colusa Co.) 365 Comment
  UCD133669  Juniperus californica L. Ahart 1971-6-10 79 Colusa Near Sites. 76 Comment
  CHSC94282  Keckiella corymbosa Lowell Ahart 2006-8-9 13102 Colusa On the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 422 Comment
  JEPS110095  Kickxia elatine Lowell Ahart 2006-8-9 13134 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  CDA6281  Kickxia spuria F. Argain 1965-11-18 Colusa Norman Road & Main Street, Princeton. 0 Comment
  CHSC107962  Koeleria phleoides B. Castro; Robin Carter, Jessica Boyt 2011-4-25 1851 Colusa Sacramento Valley. Extreme W edge of Sacramento Valley; 5 air mi NW of Maxwell, 1 mi southeast of Funks Reservoir and 170 ft northeast of Tehama-Colusa Canal. Ca 0.15 mi S of large +- saline/alkaline wetland/marsh, on dry grassy hillside just downslope from canal. 59 Comment
  RSA746963  Lactuca serriola George K. Helmkamp, E. A. Helmkamp 2008-10-14 14244 Colusa Sacramento Valley: along CA-20, 0.2 mile east of the Sutter County Line 9 Comment
  UC33049  Lactuca serriola J. Burtt Davy 1898-5-1 4275 Colusa near Willows Comment
  UCD57827  Lagophylla minor Gordon Harrington 2007-4-17 36 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Destanella Flat, just south of Hwy 20, approximately 3.4 road miles west of the Hwy 16 intersection. 567 Comment
  RSA0011767  Lagophylla minor A. A. Heller 1940-5-6 15578 Colusa On State Hwy 20, 2 miles W of the junction with Hwy 16. Comment
  CAS-BOT-BC341470  Lagophylla ramosissima L. R. Abrams 1928-5-8 12586 Colusa 2 miles south of Arbuckle Comment
  JEPS80244  Lagophylla ramosissima L. R. Heckard and J. Hickman 1980-9-15 5419 Colusa slopes w of Summit Springs; Snow Mt. 1554 Comment
  UCR238928  Lamium amplexicaule George K. Helmkamp, E. A. Helmkamp 2012-2-9 18533 Colusa Sacramento Valley, River Road, 7.1 miles north of Colusa; east side of Sacramento River 18 Comment
  CHSC77915  Lasthenia californica Jean Witzman; Beth Hendrickson 1999-4-7 Colusa Vicinity of Antelope Valley, Funks Creek, and Logan Ridge. 121 Comment
  POM288355  Lasthenia californica Lyman Benson 1933-4-16 4329 Colusa 5 miles east of Lake County line. Mt. Range: Inner N. Coast; Watershed: N. Fork Cache Creek. 457 Comment
  UC90030  Lasthenia ferrisiae K. Brandegee Apr 1889 Colusa Colusa Junction Comment
  CAS-BOT-BC353480  Lasthenia fremontii A. A. Heller 1921-4-10 13546 Colusa Near Colusa Comment
  UC90070  Lasthenia fremontii T. S. Brandegee Apr 1889 Colusa Stites Comment
  CHSC107929  Lasthenia glaberrima B. Castro; L. Janeway 2011-4-27 1862 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; approximately 1 mi southeast of Funks Reservoir and 800 ft northeast of Tehama-Colusa Canal. Approximate center of large +- alkaline marsh. 49 Comment
  UC1535364  Lasthenia glaberrima J. M. Tucker 1978-5-6 4408 Colusa w side Bear Valley Road (11 mi (by road) n of junction with State Highway 20) 365 Comment
  SEINET5712846  Lasthenia glaberrima J. M. Tucker 1978-1 4408 Colusa West side of Bear Valley Road, 11 miles (by road) north of junction with State Hwy 20. 366 Comment
  UCR261737  Lasthenia glabrata Ann Howald 2003-4-23 2306 Colusa Inner North Coast Ranges, Bear Valley Road, c. 1.5 miles north of intersection with Bear Valley Grade/Old Wilbur Road 395 Comment
  CHSC79464  Lasthenia glabrata subsp. glabrata Simona Altman 1999-4-3 51 Colusa Bear Valley, Bear Valley Rd. 396 Comment
  HSC96787  Lasthenia glabrata subsp. glabrata J. Carey, A. Hong, J. Leffingwell 1995-4-1 30 Colusa Bear Valley Rd., 1.2 mi. S of its junction with Brim Rd. 415 Comment
  RSA293117  Lasthenia glabrata subsp. glabrata J. P. Smith, Jane P. Nelson, Thomas W. Nelson 1978-4-2 9529 Colusa Bear Valley Road, 5 miles from its junction with State Route 20. 390 Comment
  UC1049545  Lasthenia glabrata subsp. glabrata Rimo Bacigalupi 1950-4-16 3124 Colusa Bear Valley Comment
  UC638651  Lasthenia glabrata subsp. glabrata Ethel Crum 1938-5-8 2034 Colusa 4 mi s Leesville 426 Comment
  CAS-BOT-BC353439  Lasthenia glabrata subsp. glabrata Ella Dales Cantelow 1936-4-11 1151 Colusa Jct. William Hy, Bear Creek Canyon Comment
  UC71630  Lasthenia gracilis Miss Alice King 1905-1-1 Colusa College City Comment
  CHSC116580  Lathyrus jepsonii B. Castro; Tom Boullion 2015-6-15 17336 /4/20 Colusa Sacramento Valley. CA 5 air mi N of colusa, ca 0.5 mi E of Hwy 45 off N edge of Reservation Road. On upper terrace within levee, overlooking a riprap-lined bend in the Sacramento Rier (Rivermile ~154.3). 16 Comment
  JEPS127615  Lathyrus jepsonii var. californicus B. Castro with Tom Boullion 2008-6-4 1733 Colusa Ca 5 air miles N of Colusa, ca 0.5 mi E of Hwy 45 off N edge of Reservation Road. On upper terrace within levee, overlooking riprap-lined bend in the Sacramento River (River-mile 154.3). Comment
  JEPS80788  Lathyrus jepsonii var. californicus L. R. Heckard and J. C. Hickman 1981-7-30 5761 Colusa se side of Snow Mountain, Trout Creek Trout Creek; Snow Mountain, Trout Creek 1584 Comment
  JEPS95647  Lathyrus jepsonii var. californicus Vernon H. Oswald and L. Ahart 1999-6-22 9782 Colusa West of Stonyford and 0.7 mi south of Letts Lake Road on FS 17N02: T17N R8W Sect. 25, 4440 ft, mixed coniferous forest 1353 Comment
  UCD81710  Lathyrus jepsonii var. californicus Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5716 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones Spring area on W side of road, ca. 6.5 road mi N of junction with Hwy 20. W side of road. 833 Comment
  UCD80896  Lathyrus vestitus Ellen Dean; G. Harrington 2009-3-27 5296 Colusa BLM Bear Creek (Payne) Ranch, lands to the SW of the jct of Hwys 16 and 20. Along road that connects Lynch Canyon and the Ridge Trail on slope above road. 453 Comment
  HSC67099  Lathyrus vestitus subsp. vestitus Teri Bartowski, Carol Zimmerer, Ruth Takaki, Shane Feusier 1980-4-19 38 Colusa Bartlett Springs Rd. at stream crossing. Comment
  HSC95805  Lathyrus vestitus subsp. vestitus A. Skelly, B. Bletcher, G. McCabe 1996-3-30 10 Colusa 1.6 mi. W of Bear Valley Rd. and Brim Rd. on Brim Rd., 14.7 mi. on Walker Ridge Rd. to Brim Rd., 57 mi. E of Hwy. 101 on Hwy. 20, Leesville Comment
  CAS-BOT-BC323885  Layia chrysanthemoides Joshua Suchocki; Charlene Vullo; Kyle Wear 1995-4-1 44 Colusa Along Bear Valley Rd. 1.2 miles S of the junction with Brim Rd. 414 Comment
  CAS-BOT-BC323886  Layia chrysanthemoides Brad Kerstetter; Roxanne Jackson; Jeff Cox 1995-4-1 010 Colusa On Bear Valley Road, 1.2 miles S of junction with Brim Road. 414 Comment
  CAS-BOT-BC323901  Layia chrysanthemoides Mrs. H. C. Cantelow 1936-4-11 1155 Colusa Bear Creek Canyon. 396 Comment
  CHSC81247  Layia chrysanthemoides J. Trizzino 2001-3-31 14 Colusa Bear Valley Meadow along east side of Bear Valley Road. 396 Comment
  JEPS13438  Layia chrysanthemoides R. F. Hoover 1938-4-24 3224 Colusa Venado Comment
  JEPS39184  Layia chrysanthemoides W. I. Follette 1935-3-31 Colusa Williams Comment
  UC762527  Layia chrysanthemoides R. F. Hoover 1938-4-24 3221 Colusa Williams Comment
  UC89163  Layia chrysanthemoides K. Brandegee Apr 1889 Colusa Leesville Comment
  UCD163205  Layia chrysanthemoides Craig D. Thomsen 2000-3-31 2073 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 0.3 mile west of Hwy 20/16 intersection. 345 Comment
  UCR212376  Layia chrysanthemoides Ellen Dean, Craig D. Thomsen, N. Voegtly, J. Alderson, Gordon Harrington 2008-3-30 4663 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Near corral on west side of Bear Creek just south of Hwy 20 320 Comment
  SEINET5712162  Layia chrysanthemoides Clinton C. Shock 1980-1 64 Colusa Bear Valley, ca. 12 miles north of State Hwy 20; west edge of valley.; Bear Valley 390 Comment
  UCD15425  Layia fremontii Margit Sands 1985-4-13 28 Colusa in Bear Valley, 3.8 miles north of Wilbur Hot Springs rd.; 390 Comment
Read comments
Apr 18 2009
  CDA11407  Layia platyglossa G. F. Hrusa, K. van Katwyk 1995-4-22 12128 Colusa Inner North Coast Ranges; Bear Valley, 15 m. N of Hwy. 20. Comment
  CHSC110419  Layia platyglossa David Isle; Rhonda Isle; Hank Switzer 2011-4-14 1950 Colusa North Coast Ranges. Bear Valley on S edge of Bear Valley R. MDBM. Comment
  CHSC53937  Layia platyglossa Vernon H. Oswald 1991-4-21 4522 Colusa Bear Valley Rd in Bear Valley, 3.3 mi south of Brim Rd (Bartlett Springs Rd), west of Williams. Roadside. 417 Comment
Read comments
May 24 2013
  HSC92539  Layia platyglossa S. Morrissette, J. Williams, K. Kopper 1994-4-24 23 Colusa Bear Valley Rd., approx. 1.3 miles south of junction with Brimm Rd. 412 Comment
  SEINET11447842 Image available Layia platyglossa M. J. Williams 1967-5-7 s.n. Colusa Bear Valley 396 Comment
  JEPS13435  Layia septentrionalis R. F. Hoover 1938-4-23 3206 Colusa grade on Rumsey; Arbuckle road Comment
  UC75946  Layia septentrionalis Miss M. Alice King 1905-1-1 Colusa near College City Comment
  UC761855  Layia septentrionalis R. F. Hoover 1938-4-23 3206 Colusa grade on Rumsey-Arbuckle road Comment
  UCR261645  Layia septentrionalis Ann Howald 2003-3-26 2289 Colusa Inner North Coast Ranges, Indian Valley, East Park Reservoir, Catholic Point peninsula, near Coppermine Road, c. 0.2 mi northwest of intersection with East Ruby King Road 407 Comment
  UCR261679  Layia septentrionalis Ann Howald 2003-4-24 2316 Colusa Inner North Coast Ranges, Indian Valley, west side of East Park Reservoir, south side of road to spillway 367 Comment
  UC1100313  Leersia oryzoides Herbert L. Mason 1945-9-19 12715 Colusa 1 mi above Colusa (below causeway over Butte Sink spillway, e bank of Sacramento River, Butte Sink); Sacramento River, Butte Sink Comment
  UC1101247  Lemna aequinoctialis Malcolm A. Nobs, S. Galen Smith 1949-9-10 1889 Colusa about 1 mi s of Maxwell Comment
  UC1101273  Lemna aequinoctialis Herbert L. Mason 1946-8-15 13009 Colusa 2 mi w on Williams Highway by bridge Colusa; Williams Highway Comment
  CAS-BOT-BC527290  Lemna trisulca C. Ritchie Bell 1951-6-13 1167 Colusa Below Letts Meadow on road from Bear Creek to Foutes Spring 914 Comment
  CAS-BOT-BC527293  Lemna trisulca J. M. Tucker; L. K. Mann; John Tothill 1959-5-30 3532 Colusa On small lake in Mill Valley, ca. 1/4 mile northwest of Lower Letts Valley, and ca. 4 airline miles, north of Goat Mountain Lookout Comment
  RSA141287  Lemna trisulca J. M. Tucker, L. K. Mann, John Tothill 1959-5-30 3532 Colusa Small lake in Mill Valley, ca. 1/4 mile northwest of Lower Letts Valley, and ca. 4 miles, airline, north of Goat Mountain Lookout 1220 Comment
  SEINET8201321 Image available Lemna trisulca J. M. Tucker, L. K. Mann, John Tothill 1959-1 3532 Colusa Mill Valley Comment
  UCD63714  Lepidium draba Craig D. Thomsen 2008-4-7 2724 Colusa BLM Payne Ranch. Southwest of intersection of Hwy 16 and Hwy 20. Along entry road into Cowboy Camp from Hwy 16, 1 mile south of Hwy 20. Comment
  HSC72170  Lepidium lasiocarpum J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9542 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  SEINET1908437  Lepidium latifolium G. K. Helmkamp, E. A. Helmkamp 2008-1 14257 Colusa Sacramento Valley: along River Road (generally following the Sacramento River), 1.1 miles north of Colusa 18 Comment
  SEINET2033409 Image available Lepidium latifolium George K. Helmkamp, E. A. Helmkamp 2008-1 14257 Colusa Sacramento Valley; along River Road (generally following the Sacramento River), 1.1 miles north of Colusa (Meridian 7.5' Q.: 39 deg. 13'33''N, 121 deg. 59'43''W, +/- 1000m). 18 Comment
  UCD72469  Lepidium latifolium Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3803 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. Bank of Bear Creek near north end of bridge, west side of creek. 260 Comment
  CAS-BOT-BC89760  Lepidium latipes Roxana S. Ferris 1917-4-12 502 Colusa 4 miles east of Williams. Comment
  CHSC52006  Lepidium nitidum Camille M. Corda 1982-4-12 17 Colusa Ca. 0.3 mi w of jct of Hwys 20 and 16, s side of Bear Creek, 100 ft from n side of Hwy 20, ca. 18 mi sw of Williams. 321 Comment
  JEPS53702  Lepidium nitidum W. L. Jepson 1920-5-23 8967 Colusa 2-3 mi sw Leesville (foot of Bartlett grade, w side of Bear Valley); Bear Valley, Bartlett Grade 426 Comment
  CHSC79002  Lepidium strictum J. Marr; C. Warren, H. West, N. Wight 1998-6-11 Colusa West of Maxwell, vicinity of Logan Ridge and Funks Creek. 114 Comment
  UC1100305  Leptochloa fascicularis Herbert L. Mason and Verne Grant 1946-8-6 12962 Colusa pond on Colusa-Marysville Hwy 4 mi s Colusa (w side of Sacramento River) Comment
  UCD63675  Leptochloa fusca subsp. fascicularis Elizabeth Wilson 1940-1 Colusa Colusa. Comment
  UCD82365  Leptosiphon androsaceus Robin McMaster 1973-4-15 335 Colusa 1/2 mi towards Bartlett Springs from Bear Valley Road. Comment
  RSA424704B  Leptosiphon bicolor Aaron Liston, M. A. Blumler 1987-4-26 667 -6 Colusa Bear Valley - Lodoga Road, 6.6 miles S of Bartlett Springs Jct. Comment
  UCD58114  Leptosiphon bicolor Ellen Dean; G. Harrington and P. McIntyre 2007-3-16 3381 Colusa Payne Ranch. Along Hwy. 20, Destanella Flat area just E of Lake Co. border. Ca. 3.4 road miles west of junction with Hwy. 16. Along unimproved road that goes south from Hwy. 20, ca. 2.3 road miles W of junction with Hwy. 16. Unnamed valley with old building called 'Roadkill Cafe. 414 Comment
  HSC85934  Leptosiphon bicolor Michalski, Raum, Hopson 1987-4-12 61 Colusa Side of Leesville-Williams Rd. Comment
  RSA388851  Leptosiphon bicolor Eugene Tanimoto 1975-4-20 s.n. Colusa Bear Valley Road, 8.7 miles north of State Highway 20. Comment
  UCD14330  Leptosiphon bicolor Kathi A. Zurakowski 1984-4-21 Colusa Colusa Co.; Bear Valley, 3.2 miles north of Wilbur Springs turnoff, west of road; 381 Comment
  UCD55171  Leptosiphon bolanderi Kim E. Steiner 1978-4-29 202 Colusa Walker Ridge Road; 1.5 miles N of State Hwy 20. 777 Comment
  HSC47564  Leptosiphon ciliatus J. P. Smith, J. O. Sawyer 1978-4-29 9796 Colusa Bear Valley Rd., 5.9 mi. from its junction with Hwy. 20 366 Comment
  HSC99741  Leptosiphon ciliatus J. Carey, A. Hong, J. Leffingwell 1995-5-7 86 Colusa 2.25 mi. SE on Leesville-Williams Rd. from its junction with Bear Valley Rd. 396 Comment
  HSC85855  Leptosiphon filipes Rob Marheine, Tim Tilghman, Bruce Delgado 1987-4-11 Colusa Bear Valley, Bartlett Springs Rd. Comment
  CHSC1269  Leptosiphon parviflorus V. Holt 1935-5-12 Colusa Stonyford. Comment
  UCD163911  Leptosiphon parviflorus Sara Martin 2016-4-9 4 Colusa BLM Bear Creek Ranch (Previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. Hill to the south of corral at junction of 16 and 20. 375 Comment
  UCD81858  Leptosiphon parviflorus Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5742 Colusa Walker Ridge. Along Walker Ridge Road. Lookout area with fence and view of Indian Valley Reservoir. North of turnoff to Indian Valley Reservoir and S of turnoff to picnic area. W side of road. 1061 Comment
  UCD82545  Leptosiphon parviflorus Ellen Dean; G. Harrington, C. Thomsen,R. Wilmarth,Chiao-Yi Cheng 2009-5-20 5700 Colusa Walker Ridge. Along Walker Ridge just S of turn-off to picnic area near Cold Spring. 1007 Comment
  CHSC32205  Lesquerella occidentalis subsp. occidentalis James Jokerst 1980-8-7 1067 Colusa North Coast Ranges. Near Snow Mountain (west). Comment
  CAS-BOT-BC341801  Lessingia nemaclada Peter H. Raven; R. Snow 1959-9-11 14425 Colusa About 2 miles south-east of Happy Camp 762 Comment
  SD132027  Lessingia nemaclada Barbara Ertter, Neese,Fujii,Espindola 1989-10-21 8868 Colusa Brim Road, southwest of Leesville to Indian Valley Reservoir 609 Comment
  JEPS85618  Lessingia ramulosa Rimo Bacigalupi with G. T. Robbins 1954-6-25 4621 Colusa 0.1 mi e Lake County line (e of summit of road from Bear Valley to Indian Valley) 640 Comment
  RSA0118883  Lessingia ramulosa Lowell Ahart 2013-10-1 19068 Colusa Inner North Coast Range. North of the wash and State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  UCD66698  Lessingia ramulosa Craig D. Thomsen 2000-6-23 2400 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UCD66708  Lessingia ramulosa Craig D. Thomsen 2001-5-24 2507 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.17 and 2.25. 342 Comment
  UCD84547  Lessingia ramulosa Ellen Dean; C. Thomsen, T. Hansen, and windfarm meeting 2010-6-11 6145 Colusa Walker Ridge. Along Walker Ridge Road, N of turnoff to Indian Valley Reservoir but S of Til Jones Spring. Many old undeveloped roads here. 817 Comment
  JEPS15551  Lewisia triphylla G. Thomas Robbins with L. R. Heckard 1956-7-25 3708 Colusa meadow along trail due s, skirting e base of ridge forming Snow Mt. West Snow Mt. East; Snow Mt. West 1981 Comment
  UC38247  Leymus triticoides J. Burtt Davy May, 1898 4290 Colusa near Princeton Comment
  UCD163658  Leymus triticoides Craig Thomsen 1998-6-10 1956 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  CAS-BOT-BC451579  Lilaea scilloides Roxana S. Ferris 1917-4-12 723 Colusa 4 miles East of Williams Comment
  JEPS80768  Lilium pardalinum L. R. Heckard and J. C. Hickman 1981-7-30 5736 Colusa along Trout Creek Trail, se side of Snow Mountain Snow Mountain; , Trout Creek Trail 1676 Comment
  CDA34116  Limnanthes alba P. Hiatt 1979-4-26 7 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  UCD33937  Limnanthes douglasii subsp. nivea Beecher Crampton 1958-4-21 9168 Colusa Colusa County, 2 miles W.N.W. of Lodoga. Comment
  IRVC29626  Linanthus Mark A. Elvin, Mark S. Brunell, David Isle 2006-8-3 5023 Colusa Snow Mtn; Summit Spring Trail; 1.4km W of Snow Mtn West summit; 800m N of Cedar Camp. Southern Northern Inner Coast Ranges 1989 Comment
  UC71654  Linanthus ciliatus Miss Alice King 1905-1 Colusa College City Comment
  UC73621  Linanthus ciliatus Miss Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  JEPS2613  Linanthus rattanii V. Rattan Colusa summit above Fout's Springs (summit on trail to Fout's Springs from Stony Valley); ; Above Fout's Springs, Colusa Co. Comment
  JEPS86704  Linanthus rattanii L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-19 6697 Colusa 0.5 km w Summit Springs (sw flank of mtn., Colusa-Lake County line); Snow Mtn. 1500 Comment
  UCD39927  Linum Beecher Crampton 1995-6-4 10323 Colusa Lake County Border: State Highway 20. Comment
  JEPS14626  Lithophragma Helen K. Sharsmith 1953-7-1 4403 Colusa above Linger Longer Camp Goat Mountain (Goat Mountain); Inner North Coast Ranges, Mendocino National Forest 1615 Comment
  JEPS15252  Lithophragma affine Rimo Bacigalupi with G. Ledyard Stebbins and Peter Kamb 1950-4-16 3111 Colusa 4 mi s Ladoga (and 6 mi nnw of Leesville, along Little Indian Creek); Indian Valley, Little Indian Creek 396 Comment
  UCD58099  Lithophragma affine Ellen Dean; C. Thomsen, S. Bledsoe, G. Harrington, D. Hickson 2007-3-25 3476 Colusa BLM Payne Ranch. Lands to the southwest of the intersection of Hwy. 16 and Hwy. 20. Destinella Flat, just E of the Lake County Border. Ca. 3.4 miles along Hwy. 20 from junction of Hwy. 20 and Hwy. 16. 560 Comment
  UC1051513  Lithophragma campanulatum Helen K. Sharsmith 1953-7-1 4403 Colusa above Linger Longer Camp Goat Mountain (Goat Mountain); Inner North Coast Ranges, Mendocino National Forest 1615 Comment
  JEPS80090  Lithophragma glabrum L. R. Heckard with J. Hickman 1979-6-16 5098 Colusa nw of West Peak Snow Mt. (s end of Milk Ranch meadow); , , s end of Milk Ranch meadow 1950 Comment
  RSA0118614  Logfia filaginoides Lowell Ahart 2013-5-1 18678 Colusa Inner North Coast Range. On the north side of the wash, north side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  UCD159333  Logfia filaginoides D. S. Park 2010-6-5 117 Colusa Walker ridge, Cold Spring Mt. roadside and adjacent grassland. 760 Comment
  SBBG128772  Logfia filaginoides L. Ahart 2013-5-1 18678 Colusa N side of wash, N side of State Hwy 20, just E of Lake County Line, 12.2 mi (air) ENE of Clear Lake (town), 17.1 mi (air) W of Williams 566 Comment
  RSA424750  Lomatium Aaron Liston, M. Blumler 1987-4-26 667 -7 Colusa Bear Valley - Lodoga Road, 6.6 miles S of Bartlett Springs Jct. Comment
  UCR206393  Lomatium George K. Helmkamp, E. A. Helmkamp 2009-3-11 14374 Colusa Inner North Coast Range Foothills, along CA-20, 14.3 miles southwest of Williams 375 Comment
  SEINET13944350 Image available Lomatium ciliolatum Bonnie Prange 1974-1 sn Colusa Wilbur Springs Quad. Near Clyde Mine. Elev 2800 ft 853 Comment
  CDA12080  Lomatium ciliolatum var. hooveri G. F. Hrusa 1989-4-8 5913 Colusa North Coast Biodiversity Arena; Bartlett Springs road immediately to W of Bear Valley, lower slopes of Walker Ridge. Comment
  UC903739  Lomatium hooveri Milo S. Baker 1947-4-6 11646 Colusa near Hwy. 20 ca. 1 mi. e. Lake-Colusa Co. line Comment
  UCD110811  Lomatium hooveri Christopher Mallek 2008-1 s.n. Colusa Pacific Ridge. Border of Colusa and Lake Counties. 1101 Comment
  UCR261643  Lomatium hooveri Ann Howald 2003-3-26 2288 Colusa Inner North Coast Ranges, Indian Valley, East Park Reservoir, Catholic Point peninsula, near Coppermine Road, c. 0.3 mi northwest of intersection with East Ruby King Rd. 419 Comment
  UCD150867  Lomatium hooveri Clinton C. Shock 1980-5-3 73 Colusa Walker Ridge, 14.6 miles north of State Highway 20, at intersection with road to Bear Valley. 670 Comment
  CHSC116064  Lomatium macrocarpum Richard R. Halse 2014-3-25 9033 Colusa Along the Leesville-Logoda Road ca. 5.6 miles south of Logoda; Indian Valley. 425 Comment
  RSA0060080  Lomatium macrocarpum Richard R. Halse 2014-3-25 9033 Colusa Along the Leesville-Logoda Road ca. 5.6 miles south of Logoda; Indian Valley. 425 Comment
  SEINET11263259  Lomatium macrocarpum Richard R. Halse 2014-3-25 9033 Colusa Along the Leesville-Logoda Road ca. 5.6 miles S of Logoda. Indian Valley.; 0 425 Comment
  UCD163208  Lomatium macrocarpum Craig D. Thomsen 2000-4-28 2206 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 0.3 mile west of Hwy 20/16 intersection. 345 Comment
  UCD82531  Lomatium macrocarpum Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5683 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 843 Comment
  CDA33687  Lomatium macrocarpum P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  SEINET13944634 Image available Lomatium tomentosum Jack Major, Eilif Dahl 1962-1 sn Colusa Bear Valley Comment
  UC875215  Lomatium utriculatum Lewis S. Rose 1936-4-27 36180 Colusa 11 mi. n.w. Rumsey Comment
  UCD64263  Lomatium utriculatum Craig D. Thomsen 2000-3-31 2060 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCR261619  Lomatium utriculatum Ann Howald 2003-3-25 2287 Colusa Inner North Coast Ranges, Sites-Lodoga Road, c. 1.5 miles east of Grapevine Pass, east of Clark Ridge 319 Comment
  HSC47643  Lomatium utriculatum J. P. Smith, J. O. Sawyer 1978-4-29 9795 Colusa Bear Valley Rd., 5.9 mi. from its junction with Hwy. 20 366 Comment
  SEINET13944681 Image available Lomatium utriculatum F. G. Meyer 1938-1 1361 Colusa low meadows, about 50 miles west of Williams Comment
  UCD40909  Lomatium utriculatum A. Bebensee 1984-4-21 6 Colusa 9 miles north of Hwy 20 on Bear Valley Road. About 100 yards into field on west roadside. Comment
  SEINET9672754  Lomatium vaginatum R. R. Halse 2014-3-25 9028 Colusa Along the Sites-Logoda Road, ca. 5.2 mi NW of Sites. 175 Comment
  UCD57666  Lonicera interrupta Erica A. Smith; with Plant Biology 102 2007-4-29 4 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central/Eastern part of ranch. Craig Canyon. Along unimproved road, 100 yards west of where road crosses Craig Creek. 313 Comment
  UCD63113  Lonicera interrupta Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4944 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20. 384 Comment
  UC1299560  Lonicera involucrata var. ledebourii Freed W. Hoffman 1948-6-27 2493 Colusa 8.6 mi sw Fouts Spring; North Coast Ranges, Upper Letts Valley 1310 Comment
  RSA725013  Lotus corniculatus L. Ahart 2006-8-9 13129 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
Read comments
Aug 9 2017
  SEINET7042570  Lotus formosissimus A. G. Vestal 1938-9-1 s.n. Colusa Along top of trough, Springs Ridge near Foxtrap Springs. Fouts Spring quadrangle UTM Zone 10, 530960mE, 4350980mN. Comment
  CDA15501  Lotus grandiflorus G. F. Hrusa, Willie the Dog 1998-6-19 14638 Colusa North Coast Ranges; Below Fouts Springs on Fouts Springs Rd. to Stonyford. Immed. below Candy Bucket Spring crossing. Comment
  JEPS101802  Lotus grandiflorus var. grandiflorus Dean W. Taylor 1998-6-23 16705 Colusa Walker Ridge; ; Walker Ridge, along BLM access road 929 Comment
  JEPS60204  Lotus grandiflorus var. grandiflorus L. R. Heckard 1969-5-29 2240 Colusa about 6.5 air mi se Stonyford (along Trough Spring Ridge road, 0.2 mi n of its junction with Crackerbox Ridge road) 1127 Comment
  RSA424761  Lotus humistratus Aaron Liston, M. Blumler 1987-4-26 668 -6 Colusa East Park Reservoir, 3.2 miles E of Stonyford Comment
  HSC72772  Lotus humistratus J. Krajanowski 1981-4-4 7 Colusa Salt Canyon, N side of Salt Creek, Hwy. 20, 11 mi. WSW of Williams 143 Comment
  JEPS110414  Lotus purshianus var. purshianus Lowell Ahart 2006-8-9 13112 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford 455 Comment
  UCR205138  Lotus purshianus var. purshianus George K. Helmkamp, E. A. Helmkamp 2008-10-14 14242 Colusa Sacramento Valley, along CA-20, 0.2 mile east of the Sutter County line 9 Comment
  JEPS75753  Lotus purshianus var. purshianus L. R. Heckard, and R. Bacigalupi 1976-9-6 4434 Colusa just e Fout's Camp; Snow Mt. 1859 Comment
  UCD66958  Lupinus adsurgens Ellen Dean; Davis Botanical Society 2008-5-31 5002 Colusa west of I-5 at Maxwell, east slope of Goat Mountain, along Goat Mountain Road. 1099 Comment
  CAS-BOT-BC198402  Lupinus albifrons var. albifrons Roxana S. Ferris 1926-4-23 6422 Colusa Summit of grade Williams-Stonyford Road Comment
  SD58255  Lupinus albifrons var. collinus Stanton A. Cook 1959-5-30 891 Colusa Ridge below and to the north of the summit of Goat Mountain. 1829 Comment
  UCR212293  Lupinus albifrons var. collinus Ellen Dean, Davis Botanical Society 2008-5-31 5010 Colusa West of I-5 at Maxwell, east slope of Goat Mountain, along Goat Mountain Road, between Cedar Grove Campground and the summit, near crossing of tributary of Little Stoney Creek 1309 Comment
  NY15769  Lupinus albipilosus A. A. Heller 1940-4-21 15543 Colusa Border of a field along U. S. Highway #99W, 2 miles south of Williams, in the Lower Sonoran LIfe Zone. Comment
  HSC45687  Lupinus bicolor Patricia Shesgreen 1978-4-22 32 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  HSC48044  Lupinus bicolor Thomas W. Nelson, Jane P. Nelson 1978-4-29 3938 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  JEPS81297  Lupinus bicolor L. R. Heckard with J. C. Hickman 1982-7-5 5911 Colusa below Summit Springs (S side Snow Mt.) Comment
  RSA724140  Lupinus bicolor Richard R. Halse 2002-3-21 6131 Colusa Williams; by junction of 5th Street and B Street. 24 Comment
  SEINET5328111  Lupinus bicolor R. R. Halse 2002-3-21 6131 Colusa Williams; by junction 5th St. and B St. 24 Comment
  UCR206360  Lupinus bicolor George K. Helmkamp, E. A. Helmkamp 2009-3-11 14383 Colusa Sacramento Valley, on the south side of CA-20 just west of the junction with Freshwater Road, northwest edge of Williams 49 Comment
  SEINET10838151  Lupinus bicolor subsp. tridentatus Smith 1978-4-2 Smith 9570 Colusa Colusa co. T14n, r5w, sec. 34. Bear valley rd., 2.1 Miles from its junction With state route 20. Rock faces in metasedimentary chaparral. 366 Comment
  HSC85822  Lupinus densiflorus var. aureus David Munger, Jeff Dunk, Tallchief Comet 1987-4-12 72 Colusa Comment
  POM163463  Lupinus densiflorus var. aureus Roxana S. Ferris 1926-4-23 6415 Colusa At Mountain House on the Williams-Stonyford Road. Comment
  RSA60349  Lupinus densiflorus var. aureus G. R. Campbell 1948-6-18 650 Colusa 2 miles south of Wilbur Springs Comment
  SEINET10838182  Lupinus densiflorus var. aureus J. P. Kroessig 1977-4-16 Kroessig 9 Colusa Corolla yellow-white, pleasantly scented. Large population ca. 0.3 Mi. Sw of Jct of hwys 20 and 16, s side of bear creek, ca 18 mi. Sw of williams. Wilbur Springs quad, 15'. S central border of sec 36, t14n, r5w. Open foothill Woodlands. 322 Comment
  UC84449  Lupinus formosus Katharine Brandegee April 1889 Colusa Epperson's Comment
  NY15886  Lupinus formosus var. robustus A. A. Heller 1902-5-20 5573 Colusa Near College City Comment
  JEPS81270  Lupinus luteolus L. R. Heckard and J. C. Hickman 1982-7-5 5878 Colusa slope below (s) Summit Springs (s side of Snow Mt.); , s of Summit Springs 1500 Comment
  UCD81894  Lupinus luteolus Ellen Dean; Bear Creek Ranch Grazing Committee 2009-6-19 5778 Colusa BLM Bear Creek (formerly Payne) Ranch. Lands to the SW of the junction of Hwys 16 and 20. Along Bear Creek opposite Cowboy Camp parking lot, on W side of creek. 314 Comment
  CHSC90508  Lupinus microcarpus var. densiflorus Martin Polsan 1988-4-9 14 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. 143 Comment
  UC1543161  Lupinus microcarpus var. densiflorus Charlotte G. Nast 1936-4-17 137 Colusa Williams to Lake Co. Road Comment
  UC726766  Lupinus microcarpus var. densiflorus A. A. Heller 1940-5-6 15576 Colusa on steep clay banks along State Hwy #20 about 3 mi e junction with Highway #16 Comment
  UCD63105  Lupinus microcarpus var. densiflorus Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4936 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20. 348 Comment
  OBI56805  Lupinus microcarpus var. densiflorus Rhonda Riggins 1982-5-30 1448 Colusa Roadside Ladoga-Leesville Rd, 4.4 mi N Leesville 457 Comment
  SD52958  Lupinus microcarpus var. densiflorus Peter H. Raven 1962-5-31 17910 Colusa Stae Hwy 20, 2.5 miles east of Lake County line Comment
  CHSC107948  Lupinus microcarpus var. microcarpus B. Castro; Robin Carter, Jessica Boyt 2011-4-25 1849 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 5 air mi NW of Maxwell, 1 mi southeast of Funks Reservoir and 170 ft northeast of Tehama-Colusa Canal. Ca 0.15 mi S of large +- saline/alkaline wetland/ marsh, on dry grassy hillside just downslope from canal. 59 Comment
  UCR212341  Lupinus microcarpus var. microcarpus Craig D. Thomsen 2000-4-28 2199 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mi west of Hwy 20/16 intersection, milepost 2.80-3.00 310 Comment
  SEINET12165154  Lupinus milo-bakeri Unknown 1985-1 50656 Colusa Bear Vly. W of Williams 404 Comment
  SEINET5320953  Lupinus nanus Unknown 2002-3-21 6129 Colusa Williams; By junction of 5th Street and B Street 20 Comment
  RSA724143  Lupinus nanus subsp. nanus Richard R. Halse 2002-3-21 6129 Colusa Willaism; by junction of 5th Street and B Street. 24 Comment
  CHSC114063  Lupinus succulentus Richard R. Halse 2013-3-26 8736 Colusa Along the Leesville Road ca 1.8 miles northwest of its junction with State Hwy 20, west of Williams. 85 Comment
  CHSC77930  Lupinus succulentus Jean Witzman; Beth Hendrickson 1999-4-19 Colusa Vicinity of Logan Ridge and Golden Gate. 152 Comment
  HSC72173  Lupinus succulentus J. P. Smith, Jane P. Nelson, Thomas W. Nelson 1978-4-2 9550 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  SEINET7096535 Image available Lupinus succulentus Richard R. Halse 2001-3-22 5947 Colusa Williams; along a vacant lot by 455 - 4th street. 39 9.52N 122 8.84W (Converted to decimal degrees). Elevation 18 m. 18 Comment
  SEINET9325857  Lupinus succulentus Unknown 2009-5-20 14735 Colusa Glasscock Mountain Comment
  HSC48193  Lupinus vallicola subsp. apricus Thomas W. Nelson, Jane P. Nelson 1978-4-29 3963 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  CHSC107980  Lythrum californicum B. Castro; Joe Silveira, Tom Boullion 2011-6-10 1883 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; ca 5 air mi NW of Maxwell, I mi southeast of Funks Reservoir and 0.2 mi northeast of Tehama-Colusa Canal. Ca 100 ft E of large +- saline/alkaline wetland/marsh, on S edge of compacted E-W road track that goes through marsh. 49 Comment
  UCD102989  Lythrum californicum Dick Johnson 1977-6-15 s.n. Colusa West of Williams rangeland. Comment
  CHSC94454  Lythrum hyssopifolia Lowell Ahart 2006-8-9 13161 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  RSA0015862  Lythrum hyssopifolia L. Ahart 2006-8-9 13161 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
  UCR225655  Lythrum hyssopifolia Craig D. Thomsen, Gordon Harrington 2008-7-6 2773 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 20 and 16. Western edge of ranch, near ridge trail that follows the border of Colusa/Lake Counties. Dunsfield Flat stock pond 610 Comment
  CHSC61222  Lythrum tribracteatum K. R. Stern 1980-6-30 6645 Colusa South central border area of Colusa National Wildlife Refuge. 45 Comment
  SBBG122988  Lythrum tribracteatum B. Ertter et al. 1989-10-21 8870 Colusa SE end of East Park Reservoir, N of Lodoga 365 Comment
  UC1619949  Lythrum tribracteatum Barbara Ertter with Elizabeth Neese, Laura Fujii, Dawn Espindola 1989-10-21 8870 Colusa SE end of East Park Reservoir N of Lodoga 365 Comment
  JEPS4791  Madia elegans Rimo Bacigalupi with L. R. Heckard 1951-8-6 3472 Colusa 1 mi se Sites (in canyon near stone quarry) Comment
  JEPS80798  Madia elegans L. R. Heckard and J. C. Hickman 1981-7-30 5768 Colusa about 100 ft above on n side Trout Creek (se side of mountain); Snow Mt. 1554 Comment
  CAS-BOT-BC342678  Madia elegans Roxana Stinchfield 1916-7-11 429 Colusa Sycamore Slough Road Comment
  CHSC27631  Madia exigua Timothy Spira; Robert Schlising 1978-5-13 3239 Colusa Just E of Lake County line, along Hwy 20. Comment
  CHSC79466  Madia exigua B. Castro; L. P. Janeway 2000-5-2 1106 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 216 Comment
  JEPS119422  Madia exigua G. K. Helmkamp, E. A. Helmkamp 2009-5-20 14741 Colusa Central Inner Coast Ranges, along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 Comment
  RSA755624  Madia exigua George K. Helmkamp, E. A. Helmkamp 2009-5-20 14741 Colusa Along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 320 Comment
  UC638697  Madia exigua Ethel Crum 1938-5-7 2008 Colusa 4.2 mi n Rumsey (Comanche Hills, summit of ridge); Inner North Coast Range 254 Comment
  UCD66603  Madia exigua Craig D. Thomsen 2000-5-11 2277 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UCR206319  Madia exigua George K. Helmkamp, E. A. Helmkamp 2009-5-20 14741 Colusa Central Inner Coast Ranges, along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 320 Comment
  CHSC86127  Madia gracilis Jenny Marr; Julie Cunningham, Heidi West, Caroline Warren 1998-5-27 Colusa Vicinity of Antelope Valley, Antelope Creek, and Huffmaster Road. 121 Comment
  UCD66450  Madia gracilis Craig D. Thomsen 2000-5-11 2296 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  UCD67039  Madia gracilis Ellen Dean; Davis Botanical Society 2008-5-31 5019 Colusa west of I-5 at Maxwell, Goat Mountain, ridge below summit off of Goat Mountain Road. 1734 Comment
  UCR206383  Madia gracilis George K. Helmkamp, E. A. Helmkamp 2009-5-20 14753 Colusa Inner North Coast Ranges, along CA-16, 1.8 miles north of the Yolo County line 271 Comment
  UCD81259  Malacothamnus fremontii Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5424 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Just north of the road leading up from the confluence of Bear and Cache Creeks. 323 Comment
  UCR281732  Malacothamnus fremontii David Isle, Frank Elliott 2014-6-11 2134 Colusa Northern Sacramento Foothills, Frank and Judy Elliott Ranch, c. 1 mile south of Rail Canyon Road junction with Sites-Lodoga Road and c. 0.5 mile south of Sites-Lodoga Road 604 Comment
  CHSC115622  Malacothamnus fremontii David Isle; Frank Elliott 2014-6-11 2134 Colusa Northern Sacramento Foothills: Frand and Judy Elliott Ranch, 1 mile S of Rail Canyon Rd. Jct. with Ssites-Lodoga Rd. and 1/2 mile S of Sites-Lodoga Rd. SE of Elliott home. (GPSs for Rail Canyon Rd. Jct./Sites-Lodoga Rd.) 10S-0546594E, 4356133N). Comment
  JEPS127598  Malacothamnus fremontii David Isle with Frank Elliott 2014-6-11 2134 Colusa Frank and Judy Elliott Ranch, ca 1 mile S of Rail Canyon Road junction with Sites-Lodoga Road and ca 1/2 mile S of Sites-Lodoga Road. Comment
  CHSC80037  Malacothamnus helleri L. P. Janeway; Joyce Lacey-Rickert 2000-6-1 6778 Colusa Vicinity of Grapevine Creek, Hayes Canyon, and Eggman Canyon. 335 Comment
  POM282851  Malacothamnus helleri Lyman Benson 1933-6-26 4488 Colusa Abbott mine. 549 Comment
  CHSC59692  Malacothrix californica Janet Delight 1978-4-8 5 Colusa Ca. 0.3 mi. w of jct of Hwys 20 and 16, s side of Bear Creek, ca. 18 mi sw of Williams. 321 Comment
  UCD83450  Malacothrix clevelandii Craig Thomsen; G. Harrington 2009-5-12 2826 Colusa Colusa County on Walker Ridge: About 200 yards south of spur road enroute to Eaton Springs from Walker Ridge Rd. ( About 1/2 mile east of Walker Ridge Road) 822 Comment
  CHSC27868  Malacothrix floccifera Robin Ondricek 1978-4-8 5 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. 143 Comment
  JEPS120980  Malacothrix floccifera Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18627 Colusa On N side of Hwy 20, just E of Lake County Line, 12.2 air miles ENE of town of Clear Lake, 17.1 air miles W of Williams. Comment
  UCD132838  Malacothrix floccifera Beecher Crampton 1975-4-21 9164 Colusa 1.5 miles SE of Sites. Comment
  RSA135416  Malacothrix floccifera Volney Rattan 1884-1 s.n. Colusa [no location specified] Comment
  UC1174491  Malacothrix floccifera Volney Rattan 1884-1 Colusa Comment
  RSA669479  Malva parviflora R. R. Halse 2001-3-22 5945 Colusa Williams; along a vacant lot by 455-4th Street. 18 Comment
  CHSC84435  Malvella leprosa Lowell Ahart 2003-8-15 10507 Colusa Road (disked) that bordered rice field, on the south side of Highway 20, about 1 mile southwest of Williams. 27 Comment
  CHSC88532  Malvella leprosa B. Castro; David Grant, Aric Lester 2003-9-29 1443 Colusa Vicinity of Antelope Valley, Antelope Creek and Huffmaster Road. On SSE-facing bank in sharp bend of creek. 160 Comment
  RSA140617  Malvella leprosa John H. Thomas 1960-8-30 8863 Colusa About 5 miles NW of College City along road to Sycamore. Comment
  UC1368667  Malvella leprosa L. M. Moe 1969-7-29 98 Colusa along Butte Creek ca. 3 mi. n.e. Colusa (also along rd. of Butte Creek Outing Club property); Butte Creek Comment
  UC573258  Malvella leprosa H. S. Yates 1936-8-14 6130 Colusa 3 mi. s. Colusa; Colusa Quad. 15 Comment
  UCD63127  Malvella leprosa Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4957 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Destinella Flat on the south side of Hwy 20, just east of the Lake County line, ca 3.4 rd miles west of junction with Hwy 16. 551 Comment
  CDA32964  Malvella leprosa Doug Barbe & Phyllis Hiatt 1979-5-2 Colusa Williams; waste ground by Shell station. 0 Comment
  SEINET6669708  Marah fabacea R. R. Halse 2014-3-25 9029 Colusa Along the Sites-Logoda Road about 4.7 miles northeast of Logoda; on the west end of Grapevine Pass 527 Comment
  SEINET7254189 Image available Marah fabacea Richard. R. Halse 2014-1 9029 Colusa Along the Sites-Logoda Road ca. 4.7 miles northeast of logoda; on the west end of Grapevine Pass 527 Comment
  SEINET8551368  Marah watsonii R. R. Halse 2014-3-25 9031 Colusa W end of Grapevine Pass, along the Sites-Logoda Road, ca 4.7 miles NE of Logoda. 527 Comment
  UCR206540  Marah watsonii George K. Helmkamp, E. A. Helmkamp 2009-3-17 14398 Colusa Inner North Coast Ranges Foothills, along CA-16 and Bear Creek, 7.0 miles south of the junction with CA-20; just north of the Yolo County line 194 Comment
  CHSC118890  Marah watsonii Glenn Keator 1966-4-24 Colusa Junction of Rail Canyon Road and Sites-Lodoga Road. Comment
  RSA63685  Marah watsonii Milo S. Baker 1947-4-6 11644 Colusa 1 mile E of Lake - Colusa boundary along hwy 20, Serpentine area. Comment
  UCR206379  Marrubium vulgare George K. Helmkamp, E. A. Helmkamp 2009-5-20 14757 Colusa Inner North Coast Ranges, along CA-16, 1.8 miles north of the Yolo County line 271 Comment
  CAS-BOT-BC67833  Marsilea vestita Roxana Stinchfield 1916-7-11 452 Colusa Colusa-Williams Road at the trough Comment
  JEPS374  Marsilea vestita subsp. vestita W. L. Jepson 1934-7-28 16751 Colusa Williams Comment
  UC89518  Matricaria discoidea T. S. Brandegee April 1889 Colusa Colusa Junction Comment
  UCD57865  Matricaria discoidea Gordon Harrington; Diana Hickson, Jack Alderson 2007-4-29 48 a Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. South terrace of Thompson Creek about 300 feet upstream of breached dam close to Road Kill Cafe. 395 Comment
  CDA34098  Matricaria discoidea P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  UC75895  Matricaria occidentalis Miss M. Alice King 1905-1 Colusa near City College; Sacramento Valley Comment
  UC1051742  Medicago lupulina Helen K. Sharsmith 1953-6-20 4298 Colusa Little Stoney Creek Inner North Coast Ranges, Mendocino National Forest (slopes) 762 Comment
  UCD63031  Medicago minima Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4683 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Along west side of Bear Creek, just north of Eula Canyon. 313 Comment
  CHSC112216  Medicago polymorpha Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18651 Colusa Inner North Coast Range. On the north side of State Highway 20, just east of Lake County Line, 12.2 mile (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  POM276559  Medicago polymorpha var. brevispina Lyman D. Benson 1933-4-16 4336 Colusa 5 miles south of Arbuckle, Sacramento River Watershed, Sacramento Valley. 91 Comment
  CDA14215  Melica californica G. F. Hrusa 1993-5-2 10859 Colusa Frenzel Creek Research Natural Area; Mendocino National Forest. Small colony of several clumps on lower NW facing slopes in mid-canyon of Frenzel Creek, tributary of Little Stony Creek. Scattered among openings in sparse Quercus durata chaparral. Perennial. Comment
  CHSC100246  Melica californica D. Isle 1988-4-13 1507 Colusa Mendocino National Forest - North Coast Ranges. Middle Fork Stony Creek Watershed. West of Fouts Springs youth facility; Approx. 1 mile west of current gate on Rd to Bathhouse Trail; East of road and E of Trout Ck Trailhead; Within fenced exclosure burned during 1987 Fouts Fire. 609 Comment
  CHSC79629  Melica californica B. Castro; L. P. Janeway 2000-5-4 1132 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 268 Comment
  UCD82124  Melica californica Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5653 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 839 Comment
  CHSC101644  Melica geyeri var. geyeri David W. Isle 2003-6-3 1666 Colusa Mendocino National Forest; in meadow adjacent creek in Green Flat Campground; 1 mile N-NE of Horse Rock and 1.5 miles SE of Goat Rock. 1170 Comment
  UCD57334  Melica torreyana Diane Hickson 2007-3-25 1 Colusa BLM Payne Ranch. Destinella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 560 Comment
  UCD63920  Melica torreyana Craig D. Thomsen 2001-5-24 2510 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection (between Colusa Co. mileposts 2.17 and 2.25). 342 Comment
  RSA724820  Melilotus albus L. Ahart 2006-9-26 13349 Colusa South side of the Delevan National Wildlife Refuge, north side of Maxwell Road about 3 miles west of Colusa Princeton Road, about 5 1/2 mils east of Maxwell. 24 Comment
  UCD72468  Melilotus albus Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3802 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. Bank of Bear Creek near north end of bridge, west side of creek. 260 Comment
  UCD72476  Melilotus albus Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3810 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. West side of Bear Creek, across from BLM parking lot that is located at south end of bridge. 249 Comment
  UCD169976  Melilotus officinalis G. F. Hrusa 1999-5-16 15050 Colusa Little Stony Creek. 457 Comment
  POM62477  Mentha canadensis Roxana Stinchfield 1918-7-8 382 Colusa Sycamore Slough; Stinchfield Ranch Comment
  JEPS104403  Mentha spicata Lowell Ahart 2003-10-23 10666 Colusa Along Squaw Creek, just south of East Park Reservoir, ca 1/8 mi nw of Sites Lodoga Rd, ca 1 mi n of Lodoga, ca 21 mi w of Maxwell. 368 Comment
  CHSC94314  Mentzelia laevicaulis Lowell Ahart 2006-8-9 13109 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 422 Comment
  UCD38806  Mentzelia micrantha Beecher Crampton 1958-5-19 4821 Colusa Colusa County, 6.3 miles northeast of Ladoga. Comment
  UCD63030  Micranthes californica Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4682 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Eula Canyon. 313 Comment
  CAS-BOT-BC479709  Micropus californicus Ann Howald 2003-4-23 2310 Colusa Inner North Coast Ranges: Indian Valley, East Park Reservoir, Catholic Point peninsula, west of Coppermine Road, c. 0.05 mi N of intersection with East Ruby King Rd 428 Comment
  UCD162998  Micropus californicus Craig D. Thomsen 2000-4-28 2183 Colusa Bear Creek Botanical Management Area. Roadside shoulder of Hwy 20 (south side), about 0.3 mile west of Hwy 20/16 intersection. 345 Comment
  UCR261642  Micropus californicus Ann Howald 2003-4-23 2310 Colusa Inner North Coast Ranges, Indian Valley, East Park Reservoir, Catholic Point peninsula, west of Coppermine Road, c. 0.05 mi north of intersection with East Ruby King Road 428 Comment
  CAS-BOT-BC348362  Micropus californicus var. californicus Roxana S. Ferris 1917-4-14 573 Colusa Foothills 7 mi west of Arbuckle, Arbuckle - Rumsey Road Comment
  CHSC62919  Micropus californicus var. californicus Vernon H. Oswald; Lowell Ahart 1994-4-6 6067 B Colusa Goat Mtn. Rd. at Sullivan Creek, 1.2 mi SW of Digger Pine Flat, S of Stonyford. 469 Comment
  JEPS87666  Micropus californicus var. californicus Vernon H. Oswald and Lowell Ahart 1994-4-6 6067 B Colusa s. Stonyford (Goat Mt. Rd. at Sullivan Creek, 1.2 mi. s.w. of Digger Pine Flat); Sullivan Creek 469 Comment
  UC1049551  Micropus californicus var. californicus Rimo Bacigalupi 1950-4-16 3104 Colusa vicinity Colusa-Glenn County line (ridge above Red Bridge Camp and the confluence of the North amd Middle Forks of Stony Creek); Inner North Coast Ranges, Mendocino National Forest 579 Comment
  CHSC114968  Microseris douglasii subsp. douglasii Lowell Ahart 2015-4-1 20001 Colusa Along Bear Valley Road, in Bear Valley, about 50 yards west of Bear Creek, about 6 miles south of Leesville, about 6 miles south of Highway 20. 395 Comment
  JEPS124223  Microseris douglasii subsp. douglasii Lowell Ahart 2015-4-1 20001 Colusa Inner North Coast Range. About 50 yards west of Bear Creek, about 6 miles south of Leesville, about 6 miles north of Highway 20. Comment
  JEPS94219  Microseris douglasii subsp. douglasii Vernon Oswald and Lowell Ahart 1998-5-7 8999 Colusa Bartlett Springs Road 2.1 mi w of Bear Valley Road (0.8 mi e of Sawtelle Valley and Grapevine Flat Roads); Bartlett Springs Road 524 Comment
  UC133492  Microseris douglasii subsp. douglasii Katharine Brandegee April 1889 Colusa Leesville Comment
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Aug 28 2012
  UCD57108  Microseris douglasii subsp. douglasii Gordon Harrington; Diana Hickson 2007-4-7 0021 Colusa Colusa Co. Ca. BLM Payne Ranch, SW intersection of Hwy 16 and Hwy 20, approx. 1/5 to 1/2 mile W of Roadkill Cafe on old fuel break. 442 Comment
  JEPS86634  Microseris nutans L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-19 6694 Colusa near road w Summit Springs (sw flank Snow Mountain); Colusa-Lake County Line, sw flank Snow Mountain 1550 Comment
  JEPS94209  Microseris sylvatica Vernon Oswald and Lowell Ahart 1998-5-7 8991 Colusa Lodoga-Leesville Road 4.3 mi s of Cooks Springs Road; Lodoga-Leesville Road 469 Comment
  CHSC86524  Microsteris gracilis B. Castro; Beth Hendrickson 2003-3-19 1391 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 198 Comment
  UCD56675  Microsteris gracilis Jack Alderson 2007-3-25 11 Colusa BLM Payne Ranch. Destinella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 571 Comment
  UCD57339  Microsteris gracilis Robin Testa 2007-3-25 2 Colusa BLM Payne Ranch. Destinella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 560 Comment
  CHSC94497  Mimetanthe pilosa Lowell Ahart 2006-8-9 13113 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  CDA41441  Mimulus douglasii S. E. Schoenig 1998-4-24 98 -8 Colusa Adjacent to clearing east of Brim Road, 1.5 miles west of Bear Valley Road. Comment
  JEPS110093  Mimulus floribundus Lowell Ahart 2006-8-9 13151 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  JEPS80762  Mimulus floribundus L. R. Heckard and J. C. Hickman 1981-7-30 5729 Colusa crossing Trout Creek (se side of mt.); Snow Mt. 1828 Comment
  HSC85824  Mimulus guttatus David Munger, Tallchief Comet, Jeff Dunk 1987-4-12 78 Colusa Bear Valley Comment
  JEPS121117  Mimulus guttatus Lowell Ahart 2013-5-1 18688 Colusa N of the wash and Hwy 20, just E of Lake County line, 12.2 air miles ENE of the town of Clear Lake, 17.1 air miles W of Williams. Comment
  SEINET3450718  Mimulus guttatus Unknown 2003-7-14 10383 Colusa Williams, Williams, about 21 road miles southwest, open field on the south side of highway 20, about 2 miles southwest of the intersection of highway 20 and Bear Valley Road 520 Comment
  UCD57657  Mimulus guttatus Madeline Christopher; with Plant Biology 102 2007-4-29 1 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Eastern/Central part of ranch. Craig Canyon. North side of unimproved road in Craig Creek. 323 Comment
  UCD82504  Mimulus guttatus Craig Thomsen; G. Harrington 2009-5-12 2864 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  UC1051505  Mimulus layneae Helen K. Sharsmith 1953-6-20 4290 Colusa 5 mi beyond Trough Springs (on road to Goat Mountain); Inner North Coast Ranges, Mendocino National Forest 1280 Comment
  UC1212581  Mimulus layneae Francia Chisaki, Helen K. Sharsmith 1959-5-27 1338 Colusa about 1/4 mi e Cooks Spring; Inner North Coast Ranges, Cooks Creek Comment
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Nov 19 2007
  UC971992  Mimulus layneae Herbert L. Mason 1952-6-19 14305 Colusa Black Diamond Ridge Mendocino National Forest 609 Comment
  SEINET7881836 Image available Mimulus layneae Helen K. Sharsmith 1953-6-20 4290 Colusa Mendocino Nat For ; In metamorphic rubble of forest clearing 5 mi beyond Trough Springs on rd to Goat Mt. 1280 Comment
  JEPS3633  Mimulus microphyllus H. L. Mason 1953-5-5 14518 Colusa 1/4 mi above confluence of Little Stony Creek and Trout Creek; Little Stony Creek drainage 670 Comment
  UC71647  Mimulus microphyllus Miss Alice King 1905-1 Colusa College City Comment
  UCD122648  Mimulus microphyllus R. A. Christison 1960-4-17 28 Colusa on road to Wilbur Springs, 2 miles north of State Highway 20. Comment
  JEPS82743  Mimulus nudatus L. R. Heckard and J. C. Hickman 1984-4-6 6149 Colusa just e Lake County line (along route 20) Comment
  UCD82576  Mimulus nudatus Craig Thomsen 2008-6-12 2766 Colusa Bear Creek (formerly Payne) Ranch. South side of Hwy 20, ca. 0.25 mi W of Hwy 16. West and SW of the corral that is located at the junction of Hwy 16 and 20. Comment
  RSA0118631  Mimulus pilosus Lowell A. Ahart 2013-10-1 19072 Colusa Strand of East Park Reservoir, about 2.5 miles (air) southeast of Stonyford, about 2.5 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 365 Comment
  RSA718048  Mimulus pilosus L. Ahart 2006-8-9 13105 Colusa On the south side of Stony Creek, at Mine Camp, about 3.5 miles (air) west of stonyford. 422 Comment
  HSC45718  Minuartia douglasii Sheila Logan 1978-4-22 59 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  HSC72160  Minuartia douglasii J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9535 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  UC1613426  Minuartia douglasii Charles M. Belshaw 1937-4-25 2876 Colusa vicinity of Cook's Spring (Devil's Ridge); Inner N. Coast Range, Devil's Ridge Comment
  UCD57104  Minuartia douglasii Gordon Harrington; Diana Hickson 2007-4-7 0025 Colusa BLM Payne Ranch, SW of intersection of Hwy 16 and Hwy 20, ca .5 mi. W of Roadkill Cafe, N. of Thompson Creek. 439 Comment
  SFV8394  Minuartia douglasii I. Batat 1973-4-15 24 Colusa 1.4 miles west of Bear Valley Road on Bartlett Springs Road, about 14 miles northeast of Clear Lake. 412 Comment
  CHSC91050  Minuartia nuttallii subsp. gregaria D. Isle 2003-6-12 362 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. Goat Mt.--meadow 1/4 mi. below road N80 E from jct. of Rd. to Goat Mt. lookout and Horse Glade Rd. GPS: 10S 0524032E 4346780N. 1645 Comment
  JEPS15565  Minuartia nuttallii subsp. gregaria G. Thomas Robbins with L. R. Heckard 1956-7-25 3716 Colusa slope above Dark Hollow Creek (a tributary of Middle Fork Stony Creek) (on s flank of mt., at lower edge of cirque between Snow Mt. West and Snow Mt. East); Snow Mt. East 1981 Comment
  JEPS73512  Minuartia nuttallii subsp. gregaria L. R. Heckard 1972-7-10 3130 Colusa overlooking and 3 mi nw Fouts Springs (promontory on se corner); Snow Mt. 1828 Comment
  CAS-BOT-BC229599  Mirabilis greenei Volney Rattan 1884-6-1 s.n. Colusa Coast Mountains N of San Francisco Bay. Flood-bed of Stony Creek Comment
  UC903048  Mirabilis greenei Ethel Crum 1932-5-8 1454 Colusa Stonyford North Coast Ranges (southern extension of ranges) 426 Comment
  CHSC106248  Monardella villosa B. Castro; L. P. Janeway 2001-6-3 1261 Colusa Inner North Coast Ranges. 'Til Jones Spring' at headwaters of Freshwater Branch of E. Fork Sulphur Ck, 0.6 mi E of top of Walker Ridge. Ca 3 air mi W of S end of Bear Valley, and 1.75 air mi SSE of Cold Spring Mtn. Just downslope from Walker Ridge Rd., in opening in surrounding serpentine chaparral. 822 Comment
  SEINET10582138  Monardella villosa A. Graff 1993-7-25 Graff 367 Colusa Bear Valley Rd., 2.2 miles north of Rte. 20, on right road cut. Locally infrequent on sandstone cliff, beneath Pinus coulteri, Quercus agrifolia, Arctostaphylos, sp. Past bloom. Comment
  UC883639  Monardella villosa subsp. villosa A. A. Heller 1916-6-6 12355 Colusa Coast Range on the grade about 3 miles west of Leesville Comment
  UCD82537  Monardella villosa subsp. villosa Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5690 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 817 Comment
  JEPS35220  Monolopia major Ruth Johnson 1915-4-6 Colusa College City Comment
  SFV12204  Monolopia major J. M. Tucker 1968-5-4 4109 Colusa Bear Valley, middle of valley floor, 10 miles (by road) northwest of junction of Bear Valley Road and State Highway 20. 396 Comment
  UC1056271  Muhlenbergia rigens Rimo Bacigalupi and Arthur Holmgren 1950-4-26 3166 Colusa eight mi nw Maxwell (along road to Sites, in canyon between forst hills on extreme w edge of valley); Sacramento Valley Comment
  CAS-BOT-BC83283  Myosurus minimus James Jokerst 1986-5-6 2300 Colusa Near Lurline Creek. 41 Comment
  POM312436  Myosurus minimus subsp. apus H. L. Mason 1953-4-5 14510 -a Colusa 3 miles east of Maxwell Comment
  UC1028302  Myosurus sessilis George B. Rossbach 1955-4-9 271 Colusa 3 mi e Maxwell (Sacramento Valley); Sacramento Valley 18 Comment
  CAS-BOT-BC456163  Najas guadalupensis Herbert L. Mason; Verne Grant 1946-8-15 13008 Colusa Two miles west of Colusa on Williams highway by bridge Comment
  CHSC49580  Nassella cernua Vernon Oswald 1984-5-2 1165 Colusa Fouts Springs Rd. (M10) in the Mendocino National Forest, 4.6 mi w of Stonyford. 487 Comment
  UCD87543  Nassella pulchra Freed W. Hoffman 1942-4-23 2253 Colusa Near Maxwell. Comment
  UCD87672  Nassella pulchra D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley. Destanella Flat-Walker Ridge. 450 Comment
  JEPS80184  Navarretia divaricata subsp. vividior L. R. Heckard with J. Hickman 1980-7-3 5336 Colusa ca 10 mi w Stonyford (just w of Summit Springs, Colusa-Lake County boundary); Snow Mt. 1548 Comment
  CHSC79543  Navarretia heterandra B. Castro; L. P. Janeway 2000-5-1 1104 Colusa Vicinity of Sites, hills S of the Sites-Lodoga Rd, and Grapevine Creek. 204 Comment
  JEPS117022  Navarretia heterandra David Gowen 2008-5-24 920 Colusa West side of Bear Valley Road, about 6.7 miles north of Hwy 20. Comment
  CHSC88556  Navarretia jepsonii L. P. Janeway 2001-6-6 7127 Colusa Inner North Coast Ranges. Deadshot Spring; about 1.9 km (air) east of Walker Ridge Road. 716 Comment
  JEPS104075  Navarretia jepsonii Lowell Ahart 2003-7-14 10385 Colusa Field on the south side of Highway 20, ca 2 mi sw of the intersection of Highway 20 and Bear Valley Rd, ca 21 mi (by road) sw of Williams. 520 Comment
  JEPS105730  Navarretia jepsonii David Gowen 2004-5-18 81 Colusa About 1.5 miles southeast of Stonyford at East Park Resevoir. Northwestern end, .3 mile SW of the dam that drains to Little Sony Creek. Comment
  UC908621  Navarretia jepsonii Herbert L. Mason 1946-5-30 12814 Colusa about 1 mi e Lake County line (w Colusa County); Leesville Grade Comment
  UCD61473  Navarretia jepsonii Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3919 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Just west of parking lot on west side of Bear Creek. 312 Comment
  CHSC94469  Navarretia leptalea subsp. leptalea Lowell Ahart 2006-8-9 13128 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  CHSC107942  Navarretia leucocephala subsp. leucocephala B. Castro; L. Janeway 2011-4-27 1866 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 5 air mi NW of Maxwell, 0.8 mi southeast of Funks Reservoir and 0.3 mi northeast of Tehama-Colusa Canal. At SW end of vernally moist swale which extends northeast of large +- saline/alkaline wetland/ marsh, in drying vernal pool bottom. 48 Comment
  POM64861  Navarretia leucocephala subsp. leucocephala Roxana Stinchfield 1916-7-11 449 Colusa Colusa - Williams Road at Trough Comment
  UC963802  Navarretia leucocephala subsp. leucocephala Herbert L. Mason 1945-7-11 12646 Colusa 3 mi above Colusa (Butte Lodge Outing Club, Butte Creek); Butte Creek Comment
  UCD84439  Navarretia mellita Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6049 Colusa Walker Ridge. Along Walker Ridge Road, N of turnoff to Indian Valley Reservoir but S of Til Jones Spring. Many old undeveloped roads here. 817 Comment
  CDA40123  Navarretia nigelliformis D. Brown 1986-6-3 s.n. Colusa County road southwest of Williams. 0 Comment
  CHSC112918  Navarretia nigelliformis subsp. nigelliformis B. Castro; Robin Carter, Amy Lyons 2010-5-13 1807 Colusa Vicinity of Golden Gate in Logan Ridge, Road 69 and the Tehama-colusa canal, in disturbed, grazed annual grassland. 121 Comment
  CHSC79545  Navarretia nigelliformis subsp. nigelliformis B. Castro; L. P. Janeway 2000-5-1 1103 Colusa Vicinity of Sites, hills S of the Sites-Lodoga Rd, and Grapevine Creek. 204 Comment
  CHSC85965  Navarretia nigelliformis subsp. nigelliformis Jenny Marr; Heidi West, Joyce Lacey-Rickert, Caroline Warren 1998-5-8 Colusa Vicinity of Sites and Antelope Valley. 137 Comment
  CHSC89835  Navarretia nigelliformis subsp. nigelliformis B. Castro; L. Janeway 2001-5-10 1250 Colusa Vicinity of Grapevine Creek, Antelope Creek, and Pence Mtn. Near dirt road paralleling N-S-trending perennial creek. 381 Comment
  UCD66915  Navarretia nigelliformis subsp. nigelliformis Craig D. Thomsen 2008-4-27 s.n. Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Northwest of Eula Canyon and southwest of Cowboy Camp on the west side of Bear Creek. Ridge to the north of spring box. 365 Comment
  CAS-BOT-BC233594  Navarretia pubescens J. Clausen 1935-5-20 1014 Colusa 18 miles W of Williams on Bartlett Springs Road Comment
  UC584174  Navarretia pubescens J. Clausen 1935-5-20 1014 Colusa 18 mi w Williams (on Bartlett Springs road) Comment
  UCD82118  Navarretia pubescens Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5646 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 839 Comment
  JEPS105729  Navarretia tagetina David Gowen 2004-5-18 83 Colusa About 1.5 miles southeast of Stonyford at East Park Resevoir. Northwestern end, 1/3 mile W of the dam that drains to Little Stony Creek. Comment
  POM64859  Navarretia viscidula Roxana Stinchfield 1916-6-18 301 Colusa Timber near College City Comment
  CHSC62937  Nemophila heterophylla Vernon H. Oswald; Lowell Ahart 1994-4-6 6058 Colusa Goat Mtn. Rd. 0.1 mi NE of Digger Pine Flat, S of Stonyford. Growing in gravelly soil of a roadside bank. 463 Comment
  CHSC77935  Nemophila heterophylla Beth Hendrickson; Heidi West 1999-3-23 Colusa Vicinity of Antelope Valley, Funks Creek, and Golden Gate. 137 Comment
  UC595049  Nemophila heterophylla Annetta Carter 1938-5-8 1384 Colusa 6.6 mi s Lodoga; s of Lodoga Comment
  UC606895  Nemophila heterophylla L. Constance 1938-4-22 2146 Colusa Lower Lake-Williams Rd 4 mi e Lake-Colusa LIne (on Cache Creek near Wilbur Springs); Inner North Coast Ranges, Cache Creek nr Wilbur Springs 365 Comment
  UCD66587  Nemophila heterophylla Craig D. Thomsen 2000-4-12 2158 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UCR206395  Nemophila heterophylla George K. Helmkamp, E. A. Helmkamp 2009-3-11 14372 Colusa Inner North Coast Range Foothills, along CA-20, 14.3 miles southwest of Williams 375 Comment
  UCR206667  Nemophila heterophylla George K. Helmkamp, E. A. Helmkamp 2009-3-17 14396 Colusa Inner North Coast Ranges Foothills, along CA-16 and Bear Creek, 7.0 miles south of the junction with CA-20; just north of the Yolo County line 194 Comment
  HSC87763  Nemophila menziesii Stephen Westergaard 1967-4-29 12 Colusa Bear Valley, 5 mi. N of Hwy. 20 91 Comment
  UCSB23986  Nemophila menziesii Masero, Ann 1967-2-12 Colusa Along roadside of Wilber Springs Road; 1.4 miles south of Wilber Springs; in Northern inner Coastal Ranges 548 Comment
  CHSC70890  Nemophila menziesii var. menziesii Vernon Oswald; Lowell Ahart 1998-4-21 8949 Colusa Rd. 401 1.8 mi north of Grapevine Pass on the Sites-Lodoga Rd. 472 Comment
  HSC66134  Nemophila pedunculata C. Macdonald, P. Powers, C. Raley, J. Spitler, D. Stamp 1980-4-19 42 Colusa On Bartlett Springs Rd. at stream crossing Comment
  UCD163210  Nemophila pedunculata Craig D. Thomsen 2000-3-31 2103 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 0.3 mile west of Hwy 20/16 intersection. 345 Comment
  CHSC112643  Nicotiana acuminata var. multiflora Lowell Ahart 2013-10-1 19084 Colusa Inner North Coast Range. Strand of East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  CAS-BOT-BC231532  Nicotiana glauca J. H. Thomas 1960-8-29 8846 Colusa About 11 miles SW of Williams along highway 20 Comment
  JEPS87759  Nicotiana glauca Vernon H. Oswald and Lowell Ahart 1994-3-23 6024 Colusa 1.8 mi w Stonyford-Lodoga Rd. (Goat Mtn Rd, s of Stonyford, between the road and Little Stony Creek) 487 Comment
  RSA730238  Nicotiana glauca Richard R. Halse 2007-3-25 7123 Colusa Along State Hwy 20, ca 7.8 miles northeast of its junction with State Hwy 16, at base of Salt Canyon. (WGS84) 100 Comment
  UCR206398  Nicotiana glauca George K. Helmkamp, E. A. Helmkamp 2009-3-11 14379 Colusa Inner North Coast Range Foothills, along CA-20, 9.7 miles southwest of Williams beside Salt Creek 107 Comment
  UC194932  Nicotiana quadrivalvis H. M. Hall 1916-6-16 10269 Colusa near Arbuckle (Colusa to Woodland) Comment
  UC71628  Nuttallanthus texanus Miss Alice King 1905-1 Colusa College City Comment
  UCD66934  Orobanche bulbosa Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5083 Colusa BLM Payne Ranch. Lands to the SW of jct of Hwys 16 and 20. Northwestern part of ranch, along trail that follows the border of Lake and Colusa Counties. South of junction with trail that heads down to the headwaters of Thompson Creek. 568 Comment
  UC1187361  Orobanche californica subsp. grayana Herbert L. Mason 1945-7-11 12647 Colusa Near Butte Creek; Butte Lodge Outing Club, 3 miles above Colusa. Comment
  JEPS81407  Orobanche pinorum L. R. Heckard and J. C. Hickman 1982-7-9 6014 Colusa Colusa-Lake County Boundary: Near junction of Horse Glade along road to Lookout, Goat Mt. Comment
  CAS-BOT-BC502948  Orobanche vallicola Roxana Stinchfield 1916-7-12 475 Colusa Sycamore Slough Comment
  RSA516500  Orthocarpus lithospermoides var. bicolor W. L. Jepson 1938-6-9 18964 Colusa Mts. between Indian Valley and Bear Valley. Btw. Lake Co. and Colusa Co. Comment
  JEPS95998  Packera clevelandii Vernon H. Oswald and L. Ahart 1999-6-22 9783 Colusa 1.5 mi west of Stonyford-Lodoga Road on County Road 42 paralleling Little Stony Creek: T17N R6W Sect. 29, ca. 1400 ft, 1180 ft, chaparral, serpentine substrate 426 Comment
  UC1552843  Packera clevelandii Frederica Bowcutt 1985-6-19 598 Colusa about 2 mi nw Wilbur Hot Springs (just sw of Bear Valley); Wilbur Springs Quad. 15' Comment
  UCD133496  Packera clevelandii D. Sanchez-Mata 1998-7-10 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain Road between Lodoga and Red Rock Cabin. 420 Comment
  UC1299444  Packera greenei Freed W. Hoffman 1947-6-19 1670 Colusa Cooks Springs, w Colusa County North Coast Ranges Comment
  JEPS110410  Panicum capillare Lowell Ahart 2006-8-22 13222 Colusa South side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford 349 Comment
  UCD32923  Panicum capillare subsp. hillmanii Beecher Crampton 1965-7-8 7446 Colusa Colusa County, 1 mile south of Sycamore. Comment
  SEINET238367 Image available Parapholis incurva Beecher Crampton 1953-4-29 1143 Colusa 2 miles east of Maxwell. Comment
  UC1027193  Parvisedum pentandrum Herbert L. Mason 1953-5-4 Colusa Little Stony Creek Road 0.25 mi above junction of Little Stony Creek and Trout Creek (Inner North Coast Ranges); , Little Stony Creek Road 609 Comment
  UC1613494  Parvisedum pumilum Charles M. Belshaw 1937-4-25 2851 Colusa vicinity of Cook's Spring (Devil's Ridge); Inner N. Coast Range, Devil's Ridge Comment
  JEPS110214  Paspalum distichum Lowell Ahart 2006-9-26 13352 Colusa Along the deep ditch, south side of the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell 24 Comment
  POM198505  Paspalum distichum Roxana Stinchfield 1916-7-11 454 Colusa Williams Road-the 'Trough' Comment
  UCD88914  Paspalum distichum K. Esau; D. Hartmann 1941-7-17 s.n. Colusa near Williams. Comment
  UC1613496  Pectocarya penicillata Charles M. Belshaw 1937-4-25 2840 Colusa vicinity of Cook's Spring (Inner North Coast Ranges, Devil's Ridge); Inner North Coast Ranges, Devil's Ridge Comment
  CHSC77918  Pectocarya pusilla Jean Witzman; Beth Hendrickson 1999-4-7 Colusa Vicinity of Antelope Valley, Funks Creek, and Logan Ridge. 121 Comment
  UCR261665  Pectocarya setosa Ann Howald 2003-5-5 2329 Colusa Inner North Coast Ranges, Goat Mountain Road, c. 0.25 mile west of intersection with Lodoga-Stonyford Road 394 Comment
  CHSC62850  Pedicularis densiflora Vernon H. Oswald 1994-3-23 6012 Colusa Frenzel Creek Research Natural Area on the S side of Little Stony Creek, in the section on the E side of Frenzel Creek, S of Stonyford. 518 Comment
  RSA401941B  Pedicularis densiflora Terry Roth 1979-4-14 9 Colusa [No location data on label] 1067 Comment
  RSA589938  Pedicularis densiflora Michael A. Vincent, Robert M. Rhode 1996-3-30 7304 Colusa Along Brim Road, 2.9 mi W jct Bear Valley Rd. Comment
  UCD161828  Pediomelum californicum James A. Neilson Jr. 1980-6-15 3426 Colusa Wilbur Hot Springs. (Exact location unknown. Coordinates estimated by label maker.) Comment
  UCD66581  Pediomelum californicum Craig D. Thomsen 2001-5-24 2526 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UCD66694  Pediomelum californicum Craig D. Thomsen 2000-6-23 2379 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17, about 1/8 of a mile east of Vista Point. 325 Comment
  CHSC1851  Penstemon centranthifolius E. Walker 1932-4-18 Colusa Stonyford. 365 Comment
  SEINET12327201  Penstemon heterophyllus C. C. Freeman, Wetter, M. A. 1983-1 1891 Colusa 2.2 mi NNE of the jct of CA 20 & 16 in the foothills of the Sierra Cascades Comment
  UCD38809  Penstemon heterophyllus Beecher Crampton 1958-5-19 4805 Colusa Colusa County, Ladoga. Comment
  UCSB6183  Penstemon heterophyllus Keator, Glenn 1958-6-17 Colusa Near Bartlett Springs Comment
  UCR206380  Penstemon heterophyllus subsp. purdyi George K. Helmkamp, E. A. Helmkamp 2009-5-20 14756 Colusa Inner North Coast Ranges, along CA-16, 1.8 miles north of the Yolo County line 271 Comment
  CAS-BOT-BC240290  Penstemon heterophyllus var. purdyi Ellen Dean; G. Harrington; C. Thomsen; Chiao-Yi Cheng; R. Wilmarth 2009-5-20 5674 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road 853 Comment
  UC125238  Penstemon purpusii Katharine Brandegee 1892-8-24 Colusa Snow Mountain near Monument; Snow Mountain near the Monument Comment
  UCD124198  Penstemon purpusii A. M. Shapiro 1994-6-12 s.n. Colusa at road junction just below summit of Goat Mountain. Comment
  JEPS94162  Pentachaeta exilis Vernon Oswald and Lowell Ahart 1998-4-21 8947 Colusa bordering Goat Mt. Rd. 0.2 mi. s.w. of Stonyford-Lodoga Rd. 390 Comment
  CDA8447  Pentachaeta exilis N. van Kleeck, Willa May Lowary 1970-4-18 Colusa Bear Valley, just south of Ladoga. 0 Comment
  CAS-BOT-BC77144  Pentagramma triangularis subsp. triangularis Roxana S. Ferris 1917-4-14 559 Colusa Arbuckle - Rumsey Road, foothills 7 mi. west of Arbuckle Comment
  UCD61454  Perideridia kelloggii Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3900 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Just north of the headwaters of Eula Canyon. 339 Comment
  UCR281727  Perideridia kelloggii David Isle, Frank Pendell 2014-6-16 2135 Colusa North Coast Range, c. 2 miles west of Stonyford on the Pendell Ranch, southeast of the home of Frank and Sheri Pendell c. 0.25 mile and northwest of the Stonyford Cemetary, c. 200 yards 384 Comment
  JEPS80375  Perideridia oregana L. R. Heckard and J. Hickman 1981-6-22 5608 Colusa East Peak Snow Mt. (s side of e ridge) 1950 Comment
  SBBG119882  Persicaria punctata L. Ahart 2006-8-9 13133 Colusa N side and under the bridge across Stony Crk, just N of Stonyford 347 Comment
  JEPS2272  Phacelia ciliata var. ciliata Ruth Johnson 1915-4-6 Colusa College City Comment
  RSA794842  Phacelia distans D. Isle 2008-4-9 1934 Colusa Reese Place Duck Club (4498 2 Mile Road); approx. 4 miles northeast of Maxwell. 30 Comment
  POM287455  Phacelia divaricata Lyman Benson 1933-4-16 4326 Colusa 5 miles east of Lake County line. Mt. Range: Inner N. Coast; Watershed: N. Fork Cache Creek. 457 Comment
  CHSC12748  Phacelia egena L. V. Ritter 1969-4-30 227 Colusa Ca 10 mi. sw of Williams, s side of Highway 20. Comment
  JEPS73508  Phacelia egena L. R. Heckard 1972-7-10 3125 Colusa overlooking and 3 mi nw Fouts Springs (near promontory on se corner of mt.); Snow Mt. 1828 Comment
  UC73693  Phacelia egena Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  UC1051762  Phacelia egena L. R. Heckard 1953-4-12 S- 136 Colusa University of California Botanical Garden Comment
  HSC45747  Phacelia heterophylla Stephen Plant 1978-4-22 205 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  SEINET7096745  Phacelia heterophylla subsp. virgata A. G. Vestal 1955-4-5 s.n. Colusa Steep south of facing bank ca. 1/3 mile into Colusa National Wildlife Refuge on Route 20.NAD27, 39? deg. 09' 09ao, -122?_ 11ao (converted to WGS84 decimal degrees) UTM Zone 10, 570301mE, 4333799mN. Comment
  UCD57821  Phacelia imbricata Gordon Harrington 2007-4-17 32 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Destanella Flat, just south of Hwy 20, approximately 3.4 road miles west of the Hwy 16 intersection. 552 Comment
  CHSC60747  Phacelia imbricata subsp. imbricata Vernon H. Oswald; Lowell Ahart 1993-5-27 5430 Colusa Sites-Lodoga Rd. ca. 0.4 mi W of Grapevine Pass (4.6 road mi E of Lodoga). 481 Comment
  CHSC79767  Phacelia imbricata subsp. imbricata L. P. Janeway; B. Castro 2000-5-2 6696 Colusa Vicinity of Grapevine Creek and Sites-Lodoga Road. 231 Comment
  UC1051793  Phacelia mutabilis L. R. Heckard and C. R. Bell 1951-6-13 170 Colusa n slope of mt. Mendocino National Forest, Goat Mountain (ne of Bartlett Springs, along road from Bear Creek to Fouts Springs) Comment
  CDA12020  Phacelia tanacetifolia G. F. Hrusa 1990-4-8 7671 Colusa North Coast Biodiversity Arena; Hwy 16 approx. 10 m. N of Rumsey, along Cache Creek. 198 Comment
Read comments
Jul 24 2009
  RSA799178  Phacelia tanacetifolia George K. Helmkamp, E. A. Helmkamp 2011-4-1 17129 Colusa Eastern foothills North Coast Ranges: Antelope Valley, along Maxwell-Sites Road, 0.4 mi southeast of Sites. 93 Comment
  UCD164156  Phacelia tanacetifolia Craig Thomsen 2008-4-7 2726 Colusa Bear Creek Canyon, along Bear Valley Rd. about 0.75 mile north of junction with Hwy 20. Comment
  CHSC107954  Phalaris aquatica B. Castro; T. Boullion 2011-4-20 1832 Colusa Sacramento Valley. Extreme W edge of Sacramento Valley; ca 5 air mi NW of Maxwell, 0.8 mi SE of Funks Reservoir and 800 ft east of Tehama-Colusa Canal. Ca 0.25 mi NW of large +- saline/alkaline wetland/marsh, just south of tilled grain field. 52 Comment
  UCD67073  Phalaris aquatica Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5100 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western part of ranch along ridge trail at Cache Creek Canyon. Just south of junction with trail that leads east to Brophy Canyon and Thompson Creek. 488 Comment
  UCD67056  Phalaris paradoxa Craig D. Thomsen 2008-5-23 2750 Colusa BLM Payne Ranch. Lands to the SW of Hwy 16/20 intersection. About 1 mile south of Hwy 20 (south of Destanella Flat), 2.5 miles west of Hwy 16. 420 Comment
  SEINET11587800  Phlox gracilis Unknown 2009-3-11 14370 Colusa Williams Comment
  RSA0115434  Phoradendron macrophyllum George K. Helmkamp, Elizabeth Helmkamp 2014-1-4 22508 Colusa Sacramento Valley: along CA-20 at the junction with Alameda Court, 0.2 mile west of the Sacramento River crossing at Meridian. 20 Comment
  CAS-BOT-BC135299  Phoradendron serotinum subsp. macrophyllum Roxana S. Ferris 1917-4-15 623 Colusa Sycamore. Sycamore Slough Comment
  CHSC88597  Phragmites australis L. P. Janeway; B. Castro 2001-6-3 7098 Colusa Inner North Coast Ranges. Spring at Grapevine Flat, on top of Walker Ridge about 0.8 km east of Baldy Mountain. 884 Comment
  JEPS106503  Phragmites australis L. P. Janeway, B. Castro 2001-6-3 7098 Colusa Inner North Coast Ranges. Spring at Grapevine Flat, on top of Walker Ridge about 0.8 km east of Baldy Mountain 884 Comment
  POM63850  Phyla nodiflora Roxana Stinchfield 1916-6-11 444 Colusa Willow Lake near Colusa -Williams Road. Comment
  CHSC80450  Physalis lancifolia Caroline Warren; Jenny Marr, Heidi West 1998-7-1 Colusa Vicinity of Peterson Road and Funks Creek. 91 Comment
  UC1004696  Physalis lancifolia J. M. Tucker 1954-8-23 2746 Colusa 7 mi e Arbuckle (just n of rd e from Arbuckle) Comment
  UC985936  Physalis lancifolia Herbert L. Mason and Verne Grant 1946-8-7 12979 Colusa 8 mi n Colusa; Butte Sink Comment
  CDA5826  Physalis lancifolia Cowley Jul 1931 Colusa West of Colusa. 0 Comment
  CDA37576  Phytolacca americana J. D. 2000-4-28 PDR 019976 Colusa Zumwalt Lane, Williams. 0 Comment
  UC1051745  Pickeringia montana var. montana Helen K. Sharsmith 1953-6-20 4301 Colusa Little Stoney Creek Inner North Coast Ranges, Mendocino National Forest 762 Comment
  CAS-BOT-BC76959  Pilularia americana G. Thomas Robbins; S. Galen Smith 1950-4-15 1905 Colusa Bear Valley Comment
  CDA580  Pinus sabiniana G. D. Barbe, T. C. Fuller 1986-3-6 4259 Colusa Steep bank below road grade, Leesville Grade, W of Williams. 0 Comment
  CAS-BOT-BC242677  Piptatherum miliaceum Ellen Dean; C. Thomsen; G. Harrington; Davis Botanical Society 2010-6-5 6082 Colusa Walker Ridge. Along Walker Ridge Road on southern part of the ridge, south of turnoff to Indian Valley Reservoir 683 Comment
  JEPS110173  Piptatherum miliaceum Lowell Ahart 2006-8-9 13106 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford 455 Comment
  UCD63621  Piptatherum miliaceum Craig D. Thomsen 2000-6-12 2371 Colusa BLM Payne Ranch. Southwest of intersection of Hwy 16 and Hwy 20. Between Cache Creek Ridge and Brophy Canyon, about 5 miles south of Hwy 20 and 1.5 miles west of Hwy 16. 321 Comment
  POM163443  Plagiobothrys Roxana S. Ferris 1926-4-21 6295 Colusa 3 mi W of Colusa.. Comment
  UCR206385  Plagiobothrys George K. Helmkamp, E. A. Helmkamp 2009-5-20 14751 Colusa Inner North Coast Ranges, along CA-16, 1.8 miles north of the Yolo County line 271 Comment
  CHSC89829  Plagiobothrys austiniae B. Castro; S. Innecken 2001-3-20 1215 Colusa Vicinity of Maxwell, Golden Gate in Logan Ridge, Funks Reservoir, and the Glenn-Colusa canal. 39 Comment
  CHSC81227  Plagiobothrys bracteatus Caroline Warren; Joyce Lacey-Rickert 1998-5-8 Colusa Vicinity of Sites and Antelope Creek. 91 Comment
  RSA10709  Plagiobothrys bracteatus C. B. Wolf 1928-5-8 2122 Colusa Sacramento Valley. 3 mi. S of Arbuckle Comment
  CHSC86878  Plagiobothrys canescens B. Castro 2003-3-28 1406 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 256 Comment
  SBBG126070  Plagiobothrys canescens G. K. Helmkamp with E. A. Helmkamp 2009-5-20 14750 Colusa St Hwy 16 at "Cowboy Camp" 1.0 mi S of jct with St Hwy 20, adjacent to Bear Crk 332 Comment
  SD237378  Plagiobothrys canescens G. K. Helmkamp, E. A. Helmkamp 2009-5-20 14750 Colusa Inner North Coast Ranges: along CA-16 at Cowboy Cammp 1.0 mile south of the junction with CA-20, adjacent to Bear Creek (Glascock Mountain 7.5'Q) 331 Comment
  SFV3146  Plagiobothrys canescens A. Ongun 1961-4-16 37 Colusa Bear Valley, 8 miles north of State Highway 20. Just south of wooden bridge. Comment
  CAS-BOT-BC478200  Plagiobothrys distantiflorus Ann Howald 2003-3-25 2286 Colusa Inner Coast Ranges: Indian Valley, west side of East Park Reservoir, c. 2.1 miles southeast of Stonyford, near diversion canal inflow to reservoir 369 Comment
  CHSC79099  Plagiobothrys fulvus B. Castro 2000-3-17 1040 Colusa Vicinity of Sites, Antelope Valley, and Huffmaster Rd. 182 Comment
  UCD58098  Plagiobothrys fulvus Ellen Dean; C. Thomsen, S. Bledsoe, G. Harrington, D. Hickson 2007-3-25 3475 Colusa BLM Payne Ranch. Lands to the southwest of the intersection of Hwy. 16 and Hwy. 20. Destinella Flat, just E of the Lake County Border. Ca. 3.4 miles along Hwy. 20 from junction of Hwy. 20 and Hwy. 16. 560 Comment
  UCD80898  Plagiobothrys fulvus Ellen Dean; w/ Destanella Flat Tour 2009-3-28 5298 Colusa BLM Bear Creek (Payne) Ranch, lands to the SW of the jct of Hwys 16 and 20. Destanella Flat, just E of the Lake County border, ca. 3.4 road miles west of Hwy 16 along Hwy 20, south side of Hwy 20. 560 Comment
  CHSC81232  Plagiobothrys greenei Jenny Marr; Heidi West, Caroline Warren 1998-4-16 Colusa Vicinity of Grapevine Creek and Antelope Valley. 134 Comment
  CHSC89833  Plagiobothrys greenei B. Castro; S. Innecken 2001-3-19 1214 Colusa Vicinity of Maxwell, Golden Gate in Logan Ridge, Funks Reservoir, and the Glenn-Colusa canal. 48 Comment
  CHSC31259  Plagiobothrys leptocladus R. A. Schlising; K. R. Stern 1980-5-5 3580 Colusa Southwest of Colusa, at Colusa National Wildlife Refuge; southwest cornerof refuge, north of Ware Road, in dried flats. Comment
  SD180603  Plagiobothrys leptocladus Carol Witham, Jennifer Buck 2001-4-30 151 A Colusa 2.0 miles south of the town of Colusa along Highway 20, east of Highway 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001. Comment
  HSC47742  Plagiobothrys nothofulvus Thomas W. Nelson, Jane P. Nelson 1978-4-29 3947 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  JEPS81273  Plagiobothrys nothofulvus L. R. Heckard and J. C. Hickman 1982-7-5 5883 Colusa s side Snow Mt.; , Summit Springs 1500 Comment
  POM163465  Plagiobothrys nothofulvus Roxana S. Ferris 1926-4-23 6418 Colusa At Mountain House on the Williams-Stonyford Road. Comment
  UCD120933  Plagiobothrys nothofulvus E. Witharm 1998-4-17 5 Colusa Bear Vly., Leesville-Lodoga Rd., 2 road miles NE from Bear Vly Rd. -- Leesville-Lodoga Rd. junction. Comment
  UC78102  Plagiobothrys shastensis unknown May 1886 Colusa Stites Comment
  POM63665  Plagiobothrys stipitatus Roxana S. Ferris 1917-4-12 533 Colusa 4 miles east of Williams. Comment
  JEPS123890  Plagiobothrys stipitatus var. micranthus Lowell Ahart 2015-4-28 20115 Colusa About 5 1/2 miles east of Maxwell. Comment
  SEINET3287497 Image available Plagiobothrys stipitatus var. micranthus George K. Helmkamp, E. A. Helmkamp 2009-3-11 14359 Colusa Sacramento Valley; along CA-20, 1.6 miles southwest of Colusa and just north of Colusa National Wildlife Refuge. 15 Comment
  UCD64508  Plagiobothrys stipitatus var. micranthus Craig D. Thomsen 2000-4-12 2096 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCD66938  Plagiobothrys stipitatus var. micranthus Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5087 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western side of ranch along trail that follows the border of Lake and Colusa counties. Dunsfield Flat stock pond. 628 Comment
  UCR212374  Plagiobothrys stipitatus var. micranthus Ellen Dean, Craig D. Thomsen, N. Voegtly, J. Alderson, Gordon Harrington 2008-3-30 4661 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Near corral on west side of Bear Creek just south of Hwy 20 320 Comment
  CHSC86873  Plagiobothrys stipitatus var. stipitatus B. Castro; Beth Hendrickson 2003-4-7 1416 Colusa Vicinity of Sites, Antelope Valley, and Salt Lake. 94 Comment
  UCD63009  Plagiobothrys stipitatus var. stipitatus Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4662 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Near corral on west side of Bear Creek just south of Hwy 20. 319 Comment
  HSC47746  Plagiobothrys tenellus Thomas W. Nelson, Jane P. Nelson 1978-4-29 3941 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  CAS-BOT-BC60828  Planodes virginica L. R. Abrams 1928-5-8 12590 Colusa 2 miles south of Arbuckle. Comment
  UC1584634  Plantago coronopus Dean W. Taylor 1988-3-24 9460 Colusa ca 0.5 mi n Ware Road (on Ohm Road); Sacramento Valley, Colusa National Wildlife Refuge 24 Comment
  UCD58124  Plantago coronopus Ellen Dean; PLB 102 Class 2007-4-29 3720 Colusa Payne Ranch. West of Hwy. 16. Ca. 2 road miles S of junction of Hwy. 20 and Hwy. 16. Through Craig Canyon. Near 'Roadkill Cafe. 414 Comment
  CHSC115396  Plantago erecta Lowell Ahart 2015-4-10 20004 Colusa Along the south edge of Leesville Road, about 1/2 mile east of Leesville, about 12 miles (air) northwest of Williams. 445 Comment
  CHSC59997  Plantago erecta Linda A. Bell 1975-4-19 44 Colusa Bear Valley Road, 1 mile north of State Highway 20. Comment
  HSC72167  Plantago erecta J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9542 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  POM61338  Plantago erecta Roxana S. Ferris 1917-4-12 496 Colusa 4 miles east of Williams. Comment
  UCD56910  Plantago erecta Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3513 Colusa BLM Payne Ranch. In Craig Canyon. Southwest of intersection of Hwy. 16 and Hwy. 20. 326 Comment
  UCD64271  Plantago erecta Craig D. Thomsen 2000-3-31 2067 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCD82465  Plantago erecta Craig Thomsen; G. Harrington 2009-5-12 2842 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  UCD72478  Plantago lanceolata Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3812 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. West side of Bear Creek, across from BLM parking lot that is located at south end of bridge. 249 Comment
  CAS-BOT-BC93146  Platanus racemosa Roxana Stinchfield 1916-7-8 395 Colusa Sycamore Slough. Stinchfield Ranch. Comment
  CHSC23473  Platystemon californicus S. R. Poe 1974-3-30 29 Colusa In fields adjacent to highway 20, 22.5 mi. w of williams. Comment
  CHSC79537  Platystemon californicus Simona Altman 1999-4-3 53 Colusa Bear Valley, Bear Valley Rd. 396 Comment
  HSC83345  Platystemon californicus Robin Brooks 1975-4-20 31 Colusa Bear Valley Rd., 8.7 mi. N of State Hwy. 20 Comment
  UCD96073  Platystemon californicus Clinton C. Shock 1980-5-3 61 Colusa Bear Valley, about 12 miles northwest of State Highway 20. 384 Comment
  SEINET5718795 Image available Platystemon californicus Lois Goodman 1969-1 1 Colusa 9.5 miles north of State Hwy 20. Comment
  SFV8387  Platystemon californicus L. E. Miller 1973-4-15 12 Colusa Middle of Bear Valley, north of State Highway 20. Roadside. Comment
  UCD13217  Platystemon californicus Steve Daniel 1986-4-13 10 Colusa California. Colusa Co. Bear Valley, 7.6 mi No of jct of Bear Valley Rd. and hwy 20. Elev. ca. 1300 ft. 396 Comment
  UCD14364  Platystemon californicus L. Coats 1983-4-24 15 Colusa Colusa Co.; along Bear Valley Road, 4.3 miles south of Bartlett Springs Road; Comment
  CHSC115381  Platystemon californicus var. californicus Lowell Ahart 2015-4-1 20002 Colusa Along Bear Valley Road, in Bear Valley, about 50 yards west of Bear Creek, about 6 miles south of Leesville, about 6 miles north of Highway 20. Inner North Coast Range. 395 Comment
  POM158154  Platystemon californicus var. californicus Lyman Benson 1935-3-27 6335 Colusa 2 mi W of Williams. Inner N Coast mtn range, Sacramento River watershed. 122 Comment
  RSA388341  Platystemon californicus var. californicus Linda Bell 1975-4-19 40 Colusa Bear Valley Road, 1 mile north of State Highway 20 Comment
  CHSC62948  Plectritis ciliosa subsp. ciliosa Vernon H. Oswald; Lowell Ahart 1994-4-6 6066 Colusa Goat Mtn. Rd. at Sullivan Creek, 1.2 mi SW of Digger Pine Flat, S of Stonyford. 469 Comment
  JEPS87664  Plectritis ciliosa subsp. ciliosa Vernon H. Oswald and Lowell Ahart 1994-4-6 6066 Colusa 1.2 mi sw of Digger Pine Flat (s of Stonyford, Goat Mountain Road at Sullivan Creek); Sullivan Creek, Goat Mountain Road 469 Comment
  UC999845  Plectritis ciliosa subsp. ciliosa S. C. Dyal, A. Carter, E. Crum 1938-5-7 683 Colusa near Williams Comment
  UC999837  Plectritis ciliosa subsp. ciliosa S. C. Dyal, A. Carter, E. Crum 1938-5-7 711 Colusa Colusa County Comment
  CHSC86875  Plectritis macrocera B. Castro 2003-4-1 1410 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. On cutbank of dirt road which contours along hillside. 185 Comment
  JEPS94195  Plectritis macrocera Vernon Oswald and Lowell Ahart 1998-5-7 9007 Colusa Bartlett Springs Rd. 2.1 mi. w. of Bear Valley Rd., 0.8 mi. e. of Sawtelle Valley & Grapevine Flat rds. 524 Comment
  SEINET3287538 Image available Poa annua George K. Helmkamp, E. A. Helmkamp 2009-1-31 14322 Colusa Sacramento Valley; Jameson Road 1.3 miles north of its junction with Lurline Road and south of Harbison Road, generally west of the city of Colusa. 16 Comment
  UCR206675  Poa annua George K. Helmkamp, E. A. Helmkamp 2009-1-31 14322 Colusa Sacramento Valley, Jameson Road 1.3 miles north of its junction with Lurline Road and south of Harbison Road, generally west of the city of Colusa 16 Comment
  UCR206852  Poa annua George K. Helmkamp, E. A. Helmkamp 2009-3-11 14360 Colusa Sacramento Valley, along CA-20, 1.6 miles southwest of Colusa and just north of Colusa National Wildlife Refuge 15 Comment
  CHSC57562  Poa bulbosa Steven Triano 1987-4-4 16 Colusa Salt Canyon, n side of Salt Creek, ca. 40 ft s of Hwy 20, 11 mi wsw of Williams. 143 Comment
  UCD82444  Poa howellii Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5661 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 861 Comment
  UCD82624  Poa pratensis Craig Thomsen; G. Harrington 2009-5-12 2894 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  JEPS80373  Poa secunda subsp. secunda L. R. Heckard and J. Hickman 1981-6-22 5606 Colusa s side of e ridge of E Peak Snow Mt 1950 Comment
  UCD90806  Poa secunda subsp. secunda Beecher Crampton 1958-4-21 4729 Colusa Southwestern Colusa County. 7.8 miles NW of Rumsey, along Hwy 16, just above junction of Bear Creek with Cache Creek. Comment
  JEPS68348  Polanisia dodecandra subsp. trachysperma L. R. Heckard with R. Bacigalupi and B. Doren 1971-9-9 2788 Colusa ca. 2 mi. n.w. Sites 243 Comment
  CDA22742  Polygonum amphibium var. emersum P. Steinbaugh, Goodwin 1932-10-1 Colusa Near Grand Island. 0 Comment
  CHSC85960  Polygonum aviculare Jenny Marr; Caroline Warren 1998-5-4 Colusa Vicinity of Sites, Stone Corral Creek, and Antelope Valley. 106 Comment
  JEPS80124  Polygonum bistortoides L. R. Heckard and J. Hickman 1980-7-1 5282 Colusa cirque between East Peak and West Peak (ca 10 mi w of Stonyford); Snow Mt. 2042 Comment
  UC1299697  Polygonum sawatchense subsp. sawatchense Freed W. Hoffman 1948-6-27 2528 Colusa 8.6 mi sw Fouts Spring (w Colusa Co.); Upper Letts Valley 1310 Comment
  CHSC107163  Polypogon maritimus L. P. Janeway; B. Castro 2011-5-19 10281 A Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 1.8 km southeast of Funks Reservoir and 0.1 km northeast of Tehama-Colusa Canal. Large +- alkaline vernal pool/marsh; mucky clay soil. At edge of deepest west end of the marsh in a large patch of Juncus balticus, at the edge of the water line. 49 Comment
  CHSC94413  Polypogon maritimus Lowell Ahart 2006-8-9 13171 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UCD67067  Polypogon maritimus Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5095 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western part of ranch along ridge trail at Cache Creek Canyon. Just south of junction with trail that leads east to Brophy Canyon and Thompson Creek. 494 Comment
  UCD72472  Polypogon maritimus Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3806 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. Bank of Bear Creek near north end of bridge, west side of creek. 259 Comment
  CAS-BOT-BC232541  Polypogon monspeliensis A. A. Heller 1902-5-19 5570 Colusa Near Colusa Comment
  CHSC107161  Polypogon monspeliensis L. P. Janeway; B. Castro 2011-5-19 10281 B Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 1.8 km southeast of Funks Reservoir and 0.1 km northeast of Tehama-Colusa Canal. Large +- alkaline vernal pool/marsh; mucky clay soil. At edge of deepest west end of the marsh in a large patch of Juncus balticus, at the edge of the water line. 49 Comment
  CHSC77637  Polypogon monspeliensis Heidi West; Caroline Warren, Julie Cunningham, Jenny Marr 1998-5-27 Colusa Vicinity of Antelope Valley, Huffmaster Road, and Sites. 121 Comment
  POM206735  Polypogon monspeliensis A. A. Heller 1902-5-19 5570 Colusa Near Colusa. Comment
  SD225721  Polypogon monspeliensis Carol Witham, Jennifer Buck 2001-4-30 149 Colusa 2 mi. south of the town of Colusa along Hwy 20, east of Hwy 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001 Comment
  SEINET10901036  Polypogon monspeliensis Katherine L. Morris 1973-6-6 Morris 384 Colusa Chaparral woodland and sparse oaks; on Hwy 20, 0.3 mi E of Lake County line. Comment
  HSC97043  Polypogon viridis L. Ahart 2006-8-9 13159 Colusa N side and under the bridge across Stony Creek, just N of Stonyford. 348 Comment
  CHSC116676  Polystichum imbricans subsp. curtum Lowell Ahart; John Dittes, Josephine Guardino 2016-2-14 20721 Colusa On the east side of the gravel road, about 1/2 mile north of Letts Lake, about 1/2 mile south of thee large campground, about 13 miles (air) southwest of Stonyford. 966 Comment
  HSC86897  Populus fremontii subsp. fremontii Anthony J. Desch, Bryon Cariss 1988-4-17 36 Colusa Goat Mountain Rd. 7 mi. W from its junction with Stonyford Rd. Comment
  UCD67085  Potamogeton diversifolius Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5107 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western edge of ranch on ridge above Cache Creek Canyon. Spring-fed stock pond at base of uphill climb east side of ridge trail. 510 Comment
  UCD35976  Potamogeton nodosus Beecher Crampton 1963-8-5 6870 Colusa 1/4 mile E Cortena. Comment
  UC1607563  Potentilla drummondii Barbara Ertter with Elizabeth Neese 1989-7-2 8627 Colusa ca. 11 air mi due w Stonyford (Long Glade s of Milk Ranch just w of Snow Mt. West); just w Snow Mt. West 1956 Comment
  UCD164036  Poterium sanguisorba Amber Flores 2016-4-9 2 Colusa BLM Bear Creek Ranch (previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. Just west of Cowboy Camp on east side of Bear Creek. 311 Comment
  RSA0013900  Proboscidea louisianica J. C. Roos 1948-9-2 4024 Colusa West of Williams. Comment
  UC914241  Proboscidea louisianica subsp. louisianica Verne Grant and Alva Grant 1946-8-6 7842 Colusa 4 mi nw Colusa (e Colusa Co.); West Butte Ranch Comment
  JEPS101449  Proboscidea lutea Dean W. Taylor 1999-8-10 17295 Colusa 1 mile South of Williams, field between Interstate 5 and Delphos Road (old highway), 150 meters southeast of Husted Road freeway overcrossing 29 Comment
  JEPS27877  Proboscidea lutea Richard Snow 1958-8-3 671 Colusa on road to Leesville near Highway 20 Comment
  UCD163849  Prunus subcordata Craig D. Thomsen 2000-6-7 2366 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  CHSC113053  Pseudognaphalium luteoalbum Lowell Ahart 2013-10-1 19097 Colusa Inner North Coast Range. Strand of East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  CHSC79457  Pseudognaphalium luteoalbum B. Castro; L. P. Janeway 2000-5-4 1136 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 249 Comment
  CHSC101626  Psilocarphus brevissimus var. brevissimus David W. Isle 2002-4-18 1657 Colusa Mendocino National Forest; N of Fouts Springs, N of Chlorinator Building on road to Bathhouse Trail (Snow Mtn.) Edge of E-flowing ephemeral drainage in chamise site burned during 8/8/01 Trough Fire and part of Helicopter Hydromulch Study Plot. 524 Comment
  JEPS18022  Psilocarphus brevissimus var. brevissimus George B. Rossbach 1955-4-9 558 Colusa 3 mi e Maxwell; Sacramento Valley 18 Comment
  UC1178819  Psilocarphus brevissimus var. brevissimus Herbert L. Mason 1953-4-5 14507 Colusa about 3 mi e Maxwell (near bend in road by bench mark) Comment
  CAS-BOT-BC361830  Psilocarphus oregonus L. R. Abrams 1928-5-8 12589 Colusa 2 miles south of Arbuckle Comment
  UC1601294  Psilocarphus oregonus T. S. Brandegee Colusa Williams Comment
  JEPS75721  Psilocarphus tenellus L. R. Heckard 1974-9-9 3853 Colusa just se Foutch Camp; Snow Mountain 1889 Comment
  UCD163706  Psilocarphus tenellus Craig Thomsen 1999-5-10 2018 Colusa Colusa County. At confluence of Sulphur Creek and Bear Creek. About 3 miles north of Hwy 20. Comment
  UCD135314  Psilocarphus tenellus George F. Hrusa 1989-5-7 6087 Colusa slopes on north side above Little Stony Creek approximately 4 meters from intersection of Ceder Mountain Road and Stonyford-Lodoga Road. Comment
  JEPS121101  Pterostegia drymarioides Lowell Ahart 2013-5-1 18669 Colusa On the E side of Bear Valley Road, about 2.5 road miles NW of intersection of Hwy 20 and Bear Valley Road. Comment
  JEPS15216  Purshia tridentata var. tridentata Rimo Bacigalupi with L. T. Dempster, Mrs. P. A. Munz and G. T. Robbins 1956-7-25 5747 Colusa about 0.75 mi w Fouts Camp (s shoulder of Snow Mountains, Colusa-Lake County boundary); Snow Mountains 1905 Comment
  UCD117828  Pyrola aphylla M. Vincent 1968-6-6 789 Colusa On road to Stony Ford from Goat Mt. 2 4/10 miles west of Old Mills Campground. Comment
  SFV10851  Pyrola picta M. L. Vincent 1968-6-6 789 Colusa On road to Stony Ford from Goat Mountain, 2.4 miles west of Old Mills Campground. 1220 Comment
  JEPS48934  Quercus X morehus Thomas H. Jukes 1938-11-24 Colusa Stonyford Comment
  UCD45291  Quercus berberidifolia D. Sanchez-Mata 1998-7-10 s.n. Colusa Stonyford. Fouts Spring Road. Open interior live oak scrub chaparral (Quercus wislizenii var. frutescens) in deforested slopes. Comment
  CAS-BOT-BC86603  Quercus douglasii Roxana S. Ferris 1917-4-14 580 Colusa 7 mi W of Arbuckle - Rumsey Road Comment
  SBBG25340  Quercus douglasii S. C. Schank 1960-4-10 40 Colusa several hundred feet from river, Bear Valley Comment
  SD236305  Quercus douglasii G. K. Helmkamp, E. A. Helmkamp 2008-10-14 14258 Colusa Sacramento Valley: along River Road (generally following the Sacramento River), 1.1 miles north of Colusa. 17 Comment
  UCD45869  Quercus dumosa Hans G. Jung 1976-4-17 6 Colusa California, Colusa County: 2 miles west of Bear Valley, on north end of Walker Ridge, T15N, R6W, sec. 11. Elevation 1800 feet. 548 Comment
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Apr 18 2009
  UCD45981  Quercus durata D. Sanchez-Mata 1996-7-3 s.n. Colusa Williams. Walker Ridge. Wilburg Springs-Wintun Camp. Serpentine chaparral. 850 Comment
  UCD57325  Quercus durata Amy Whitcomb 2007-3-25 1 Colusa BLM Payne Ranch. Destinella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 563 Comment
  UCD84514  Quercus durata Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6065 Colusa Colusa County. On Lake County border. Walker Ridge. Along Walker Ridge Road, between Cold Spring and Buck Flat. 971 Comment
  HSC71306  Quercus durata var. durata Thomas W. Nelson, Jane P. Nelson 1979-4-12 4620 Colusa Along Stony Creek below Digger Pine Campground Comment
  UCSC010369  Quercus durata var. durata Dylan M. Neubauer, Tim Forsell 2016-3-30 593 Colusa (NCoRI) Walker Ridge, Bartlett Springs Road, 1.22 air-miles sse Baldy Mountain 899 Comment
  JEPS75761  Quercus garryana var. breweri L. R. Heckard, and R. Bacigalupi 1976-9-6 4450 Colusa Fouts Camp-Summit Spring trail Snow Mt. 1615 Comment
  JEPS82547  Quercus garryana var. breweri L. R. Heckard 1983-7-27 6112 Colusa s flank Snow Mt. (slopes around Summit Springs) Comment
  UCD67036  Quercus garryana var. breweri Ellen Dean; Davis Botanical Society 2008-5-31 5017 Colusa west of I-5 at Maxwell, Goat Mountain, ridge below summit off of Goat Mountain Road. 1734 Comment
  RSA758621  Quercus lobata George K. Helmkamp 2008-10-14 14258 Colusa Sacramento Valley: along CA-20, 0.2 mile east of the Sutter County Line 9 Comment
  RSA759171  Quercus lobata Doug Goldman 2004-11-1 2916 Colusa East side of Route 45 (Princeton Road). 23 Comment
  UCR205170  Quercus lobata George K. Helmkamp, E. A. Helmkamp 2008-10-14 14251 Colusa Sacramento Valley, along CA-20, 0.2 mile east of the Sutter County line 9 Comment
  SBBG111416  Quercus palmeri R. Raiche 1990-12-2 Colusa across Sulphur Crk from Wilbur Springs Comment
  SFV17753  Quercus palmeri R. Raiche 1990-12-2 s. n. Colusa Acoss Sulphur Creek from Wilber Springs. Comment
  UCD14527  Quercus palmeri Roger Raiche 1990-12-2 D Colusa California, Colusa Co.; across Sulphur Creek from Wilbur Springs; Comment
  JEPS73455  Quercus vacciniifolia L. R. Heckard 1972-7-8 3056 Colusa se of Snow Mt.; West Peak 1981 Comment
  CDA15554  Quercus wislizeni var. frutescens G. F. Hrusa 1998-11-7 14905 Colusa North Coast Ranges; Above Fouts Springs on Trough Springs Rd. mi. 2.7. Comment
  UCD72390  Quercus wislizeni var. frutescens Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5116 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Southwestern edge of ranch above Cache Creek Canyon along ridge trail. 548 Comment
  UCD84512  Quercus wislizeni var. frutescens Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6063 Colusa Colusa County. On Lake County border. Walker Ridge. Along Walker Ridge Road, between Cold Spring and Buck Flat. 971 Comment
  UCD82383  Rafinesquia californica Craig Thomsen; G. Harrington 2009-5-12 2824 Colusa Colusa County. Walker Ridge. South of spur road en route to Eaton Springs, about 1/2 mile east of Walker Ridge Rd. About 200 yds south of road (ravine with spring below). 822 Comment
  JEPS80085  Ranunculus alismifolius L. R. Heckard with J. Hickman 1979-6-16 5092 Colusa about 1/2 mi s Milk Ranch (nw of West Peak, Snow Mt.) 2011 Comment
  CDA19005  Ranunculus aquatilis var. aquatilis R. Breckenridge 2000-9-25 PDR 958947 Colusa East Park Reservoir, including coves on northern end of reservoir in the vicinity of Stonyford. 0 Comment
  UCR47929  Ranunculus canus Dave Read 1975-4-20 08 Colusa Inner Coastal Ranges. Bear Valley Road, 8.7 miles north of intersection with State Highway 20 412 Comment
  CAS-BOT-BC378805  Ranunculus canus var. canus A. A. Heller 1919-5-10 13113 Colusa grade east of Leesville in the oak belt Comment
  CHSC62943  Ranunculus hebecarpus Vernon H. Oswald; Lowell Ahart 1994-4-6 6057 Colusa Goat Mtn. Rd. 0.1 mi NE of Digger Pine Flat, S of Stonyford. On a roadside bank. 463 Comment
  SEINET8699529  Ranunculus hebecarpus R. R. Halse 2013-3-26 8739 Colusa Along the Leesville Road ca 5.6 miles NW of its junction with CA Hwy 20, W of Williams. 157 Comment
  UC72903  Ranunculus hebecarpus Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  UCD163875  Ranunculus occidentalis Craig D. Thomsen 2000-4-12 2453 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 1 mile west of Hwy 20/16 instersection. Comment
  CHSC99463  Raphanus raphanistrum Richard R. Halse 2007-3-22 7104 Colusa Williams; by the junction of 5th Street and B Street, 25 Comment
  POM332451  Rhamnus californica Thomas W. Nelson, Jane P. Nelson 1978-4-29 3961 Colusa Along Bear Valley Rd., 2 miles from jct with Hwy 20. 366 Comment
  HSC97351  Rhamnus ilicifolia J. P. Smith, J. O. Sawyer 2007-9-2 12412 Colusa River Rd. N of Colusa 20 Comment
  JEPS79008  Rhamnus tomentella subsp. crassifolia Edward Lee with C. Belshaw 1936-12-13 2612 Colusa Stoneyford to Lodoga Road Comment
  JEPS95649  Rhamnus tomentella subsp. crassifolia Vernon H. Oswald and L. Ahart 1999-6-22 9785 Colusa 1.5 mi west of Stonyford-Lodoga Road on County Road 42 paralleling Little Stony Creek: T17N R6W Sect. 29, ca. 1400 ft, 1180 ft, chaparral, serpentine substrate 426 Comment
  UC1299216  Rhamnus tomentella subsp. crassifolia Freed W. Hoffman 1947-6-19 1641 Colusa Cooks Springs, w Colusa County Cooks Springs Comment
  UCD117941  Rhododendron occidentale George F. Hrusa 1989-5-5 6066 Colusa Open margin of Little Stony Creek, along Rd. to Cedar Camp. 1.5 m. SW of intersection of Stonyford-Lodoga Rd. 470 Comment
  UCD117976  Rhododendron occidentale A. T. Leiser 1985-5-19 LO Colusa Between 3-4 miles along Frenzel Creek as it parallels the road M5 from Lodoga to Goat Mtn. Frenzel Creek is on S. side of road and down 30-40 ft. Populations are scattered in full sun on both sides of the creek. Comment
  HSC71304  Rhus aromatica Thomas W. Nelson, Jane Nelson 1979-4-12 4622 Colusa Along Stony Creek below Digger Pine Campground Comment
  UCD82135  Rhus aromatica Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5667 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 869 Comment
  POM174573  Rhus trilobata var. quinata Roxana S. Ferris 1926-4-23 6590 Colusa 2 miles from Stony Ford. Comment
  UC1299689  Ribes binominatum Freed W. Hoffman 1948-6-26 2513 Colusa n side Goat Mountain (Colusa Lake county line) 1630 Comment
  JEPS15562  Ribes lobbii G. Thomas Robbins with L. R. Heckard 1956-7-25 3718 Colusa about 50 yards below summit Snow Mt. West (ridge between east and west peaks of Snow Mt.); Snow Mt. 2133 Comment
  CAS-BOT-BC168901  Ribes malvaceum Eric Peterson; Matt Foruria; Tom Ward 1995-4-2 59 Colusa 4.3 north on Walker Ridge Road from jct with Hwy 20 822 Comment
  UCD80839  Ribes malvaceum Jack Alderson 2009-2-21 20 Colusa BLM Payne Ranch (Bear Creek Ranch), lands to the SW of intersection of Hwys 16 and 20. Brophy Canyon. 304 Comment
  CHSC115751  Ribes malvaceum David Isle 2015-6-20 2156 Colusa North Coast Ranges: 4 mi W of Stonyford; SE of curve at culvert crossing just E of old dumpsite rd jct; uphill, 100-200' S of 18N01 in 2012 Mill Fire area chaparral. 10S -0533568E, 4357508N. 439 Comment
  UCD119994  Ribes quercetorum Ellen Dean; G. Harrington, J. Alderson 2011-12-30 7270 Colusa N side of Hwy 20 and Salt Creek Canyon between Hwy 16 and the Central Valley. Bear Valley Ranch property. Top of small canyon. 306 Comment
  RSA0024715  Ribes roezlii J. M. Tucker 1959-5-30 3524 Colusa Ca. 1.25 miles northwest of Goat Mountain Lookout, Goat Mountain. 1768 Comment
  CAS-BOT-BC362903  Rigiopappus leptocladus Roxana S. Ferris 1926-4-23 6589 Colusa Near Stonyford Comment
  HSC48145  Rigiopappus leptocladus Thomas W. Nelson, Jane P. Nelson 1978-4-30 3966 Colusa Along Hwy. 20, E of Colusa-Lake county line 549 Comment
  POM174572  Rigiopappus leptocladus Roxana S. Ferris 1926-4-23 6589 Colusa Near Stonyford. Comment
  UC638693  Rigiopappus leptocladus Ethel Crum 1938-5-7 2012 Colusa 4.2 mi n Rumsey (Comanche Hills, summit of ridge); Inner North Coast Range, summit of ridge, Comanche Hills 254 Comment
  UCD67038  Rigiopappus leptocladus Ellen Dean; Davis Botanical Society 2008-5-31 5018 Colusa west of I-5 at Maxwell, Goat Mountain, ridge below summit off of Goat Mountain Road. 1734 Comment
  UCR212316  Rigiopappus leptocladus Craig D. Thomsen 2000-4-12 2131 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mi west of Hwy 20/16 intersection, milepost 3.00 310 Comment
  JEPS80886  Rorippa curvipes var. truncata L. R. Heckard and J. C. Hickman 1981-7-30 5733 Colusa Trout Creek crossing se side Snow Mountain, Trout Creek crossing (se side Snow Mt.) 1828 Comment
  CAS-BOT-BC147382  Rosa californica Roxana Stinchfield 1916-7-8 384 Colusa Sycamore Slough, Stinchfield Ranch Comment
  JEPS106501  Rosa californica L. P. Janeway, B. Castro 2001-6-3 7097 Colusa Inner North Coast Ranges. Spring at Grapevine Flat, on top of Walker Ridge about 0.8 km east of Baldy Mountain 884 Comment
  UC72992  Rosa californica H. P. Chandler 1905-9-14 Colusa Princeton Comment
  JEPS80824  Rubus parviflorus L. R. Heckard and J. C. Hickman 1981-7-31 5794 Colusa e side Snow Mt.; e side Snow Mt., Dark Hollow Creek 1584 Comment
  CAS-BOT-BC158728  Rubus ursinus Roxana Stinchfield 1916-7-8 381 Colusa Sycamore Slough, Stinchfield Ranch Comment
  JEPS75734  Rumex acetosella L. R. Heckard 1974-9-9 3876 Colusa se of Foutch Camp (just ne of rocky promontory); Snow Mt. 1798 Comment
  UCD82155  Rumex conglomeratus Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5681 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 843 Comment
  UCD61463  Rumex crispus Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3909 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1 mile SW of parking lot. 390 Comment
  CAS-BOT-BC421589  Rumex crispus Roxana S. Ferris 1926-4-22 6284 Colusa 3 miles west of Colusa Comment
  UCR206365  Rumex pulcher George K. Helmkamp, E. A. Helmkamp 2009-5-20 14745 Colusa Inner North Coast Ranges, along CA-16 at 'Cowboy Camp' 1.0 mile south of the junction with CA-20, adjacent to Bear Creek 332 Comment
  UCD163344  Rumex salicifolius Craig D. Thomsen 2007-7-31 s.n. Colusa Walker Ridge. East of Eaton Springs en route to Rathburn Mine. Comment
  UCD57287  Saccharum ravennae Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3658 Colusa BLM Payne Ranch. Craig Canyon. West of Hwy. 16, ca. 2 road miles south of junction of Hwy. 20 and Hwy. 16. Along unimproved road. 322 Comment
  UCR146703  Sagittaria June McCaskill, Et al. 1954-8-9 363 Colusa c. 1 mi east of Princeton and 500 yds. south of Glenn County line 23 Comment
  UC1178890  Sagittaria latifolia Herbert L. Mason 1945-9-19 12713 Colusa 1 mi n Colusa (on e side, Marshy bank of the Sacramento River); bank of the Sacramento River Comment
  UCD138041  Sagittaria latifolia Herbert L. Mason 1945-9-19 12713 Colusa Sacramento river, 1 mile north of Colusa on east side, below causeway. Comment
  UCD138036  Sagittaria montevidensis subsp. calycina Herbert L. Mason; Verne Grant 1946-8-7 12981 Colusa 8 miles north of Colusa. Comment
  CHSC78976  Salicornia virginica Vernon H. Oswald; Joseph G. Silveira 2000-9-29 9972 Colusa Delevan National Wildlife Refuge. 15 Comment
  CAS-BOT-BC103026  Salix bonplandiana Roxana S. Ferris 1926-4-23 6401 Colusa near Mountain House on Williams - Stonyford Road Comment
  CAS-BOT-BC102859  Salix breweri C. Hart Merriam 1907-7-23 s.n. Colusa Cook Springs Comment
  CHSC70904  Salix breweri Vernon H. Oswald; Lowell Ahart 1998-4-21 8944 Colusa Stonyford-Lodoga Rd. 3.7 mi south of Stonyford. 384 Comment
  UCD110780  Salix breweri D. Sanchez-Mata 1998-7-10 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain Road between Lodoga and Red Rock Cabin. 420 Comment
  UCD162977  Salix breweri Jack Major 1963-5-4 s.n. Colusa In stream, west of Bear Valley on Bartlett Springs Road. (Exact location unknown. Coordinates estimated by label maker.) 518 Comment
  UCD57307  Salix breweri Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3678 Colusa BLM Payne Ranch. Lands to the southwest of junction of Hwy. 20 and Hwy. 16. Thompson Canyon, near juncture with Craig Canyon. 362 Comment
  UCD84434  Salix exigua Jack Alderson 2009-4-8 32 Colusa BLM Bear Creek Ranch (Previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. Brophy Canyon. 304 Comment
  CAS-BOT-BC107838  Salix gooddingii Roxana Stinchfield 1916-7-7 397 Colusa Sycamore slough near Sycamore Comment
  CHSC80068  Salix gooddingii L. P. Janeway; B. Castro 2000-4-10 6662 Colusa Vicinity of Lurline Creek and Sulphur Gap. 91 Comment
  CDA12796  Salix laevigata G. F. Hrusa 1996-2-26 12631 Colusa Inner North Coast Ranges; Small valley approx. 5 m. NW of Hwy. 20 along Leesville Rd. W of Oat Valley at S end of Boxer Valley. Comment
  CDA12799  Salix laevigata G. F. Hrusa 1996-2-26 12634 Colusa Inner North Coast Ranges; On Sites-Lodoga Rd. ~2.5 m. NW of Sites at base of Little Antelope Grade. Comment
  CHSC77954  Salix laevigata Beth Hendrickson; B. Castro, L. P. Janeway, Mary Ann Griggs 1999-4-12 Colusa Vicinity of Antelope Valley, Funks Creek, and Golden Gate. 97 Comment
  UCD81258  Salix laevigata Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5423 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Just north of the road leading up from the confluence of Bear and Cache Creeks. 323 Comment
  JEPS81275  Salix lasiandra var. lasiandra L. R. Heckard and J. C. Hickman 1982-7-5 5885 Colusa s side Snow Mt. (Summit Springs, slope below (s of ) area) 1500 Comment
  CDA12798  Salix lasiolepis G. F. Hrusa 1996-2-26 12633 Colusa Serpentine Flora of California; Margin of Little Stony Creek approx. 2 m. beyond intersection of Goat Mtn. Rd. and Stonyford-Lodoga Rd. Comment
  JEPS86636  Salix lasiolepis L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-18 6686 Colusa sw flank Snow Mt. (n side of West Peak) 2000 Comment
  UCD164154  Salix lasiolepis Craig Thomsen 1999-4-1 s.n. Colusa Bear Creek Canyon. Along Bear Creek, just north of Sulphur Creek confluence, next to Wilbur Bridge. Comment
  CHSC101023  Salix lasiolepis var. lasiolepis John Dittes; Josephine Guardino 2008-3-14 1515 Colusa Great Central Valley; Sacramento Valley; butween Butte Sink and Sacramento River, north of Sutter Buttes; ca. 1.6 air mile south of Gridley Road, ca. 1.1 air mile west of Drumheller Slough. 17 Comment
  CHSC94432  Salix lasiolepis var. lasiolepis Lowell Ahart 2006-8-9 13147 Colusa Gravel bar, north side and 30 yards west of the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS110140  Salix lasiolepis var. lasiolepis Lowell Ahart 2006-8-9 13147 Colusa Gravel bar, north side and 30 yards west of the bridge across Stony Creek, just north of Stonyford 347 Comment
  JEPS118679  Salsola soda B. Castro with Dave Bogener 2011-9-1 1913 Colusa Sacramento Valley. 10 air mi W of the Sacramento River and 800 ft N of the northern boundary of Delevan NWR. Near where Hunters and Logan Creeks empty into the Colusa Basin Drain. Moulton Weir 7.5' quad. Comment
  CHSC86526  Salvia columbariae B. Castro 2003-3-18 1388 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 243 Comment
  HSC87083  Salvia columbariae L. Blackford, S. Branch, D. Malm 1988-4-16 48 Colusa 6.1 mi. on Walker Ridge Road off Hwy 20 at Blue Oak campground 732 Comment
  JEPS62672  Salvia columbariae R. F. Hoover 1938-4-24 3228 Colusa ridge between Venado and Leesville (e of Leesville) Comment
  SEINET12326928  Salvia columbariae E. M. Kelly 1977-1 9 Colusa Salt Canyon, N side of Salt Creek, Hwy 20, 10 mi WSW of Williams. Wilbur Springs Quadrangle, 15'.* 143 Comment
  UCD125703  Salvia columbariae Bob Zasoski 1967-5-6 25 Colusa around 6 miles north from State Highway 20 on Bear Valley Road (to Leesville). 396 Comment
  JEPS75867  Sambucus mexicana L. R. Heckard 1974-9-10 3881 Colusa East Circle Trail Snow Mt. (at base of ne-facing rocky cliff along spur running se from west peak) 2011 Comment
  JEPS80782  Sambucus mexicana L. R. Heckard and J. C. Hickman 1981-7-30 5755 Colusa Trout Creek Snow Mt. (se side of mt.) 1600 Comment
  JEPS228  Sanicula bipinnatifida W. L. Jepson 1932-5-8 16273 Colusa Lodoga; w Colusa Co. Comment
  UCD56944  Sanicula bipinnatifida Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3546 Colusa BLM Payne Ranch. On west side of Hwy. 16. 2 road miles south of intersection with Hwy. 20. 312 Comment
  UCD57664  Sanicula crassicaulis Erica A. Smith; with Plant Biology 102 2007-4-29 2 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central/Eastern part of ranch. Craig Canyon. Along unimproved road, where road crosses Craig Creek. 313 Comment
  UCD146697  Sanicula graveolens G. F. Hrusa 1998-6-19 14633 Colusa on NE side of Goat Mountain. 1710 Comment
  UCD163232  Sanicula tuberosa Craig D. Thomsen 2001-4-12 2437 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 1 mile west of Hwy 20/16 intersection (about 1/8 mile east of vista point). 345 Comment
  UCD82861  Sanicula tuberosa Gordon Harrington 2008-4-13 72 Colusa BLM Payne Ranch. Slopes to the SW of junction of Hwy 16 and Hwy 20. E of unnamed creek (flowing now). 385 Comment
  UCD163867  Schedonorus arundinaceus Craig D. Thomsen 2001-5-31 2555 Colusa Bear Creek Canyon, south of Bear Valley. About 4 miles north of Hwy 20. Comment
  UCD81232  Schedonorus arundinaceus Ellen Dean; K. Mawdsley, B. Rice 2009-5-6 5569 Colusa Payne Ranch, lands to the SW of the jct. of Hwys. 16 and 20. Along Bear Creek south of Brophy Canyon, near old access road that leaves Hwy. 16 near milepost 6. 220 Comment
  CAS-BOT-BC111366  Schoenoplectus acutus var. occidentalis Roxana Judkins [later Mrs. Ferris q.v.] Stinchfield 1916-7-11 470 Colusa Davis Tule near Sucamore Slough Comment
  UCD163854  Schoenoplectus pungens var. longispicatus Craig D. Thomsen 2001-4-12 2471 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UC1055825  Scirpus acutus var. occidentalis Frank W. Gould 1940-5-15 1257 Colusa 2.5 mi n Maxwell (in marshes along roadside); n of Maxwell Comment
  UC1100677  Scirpus acutus var. occidentalis Herbert L. Mason, Verne Grant 1946-8-7 12987 Colusa eight mi n Colusa (Butte Sink); , n of Colusa Comment
  CDA2621  Scirpus glaucus M. R. Pryor 1947-5-1 Colusa Grimes (col. near Biggs) 0 Comment
  CDA417  Scirpus glaucus Kingwill 1929-8-23 Colusa 0 Comment
  UC1100902  Scirpus maritimus Malcolm A. Nobs, S. Galen Smith 1949-9-9 1872 Colusa rice fields 3 mi w Williams; w of Williams Comment
  UCR261651  Scleranthus annuus subsp. annuus Ann Howald 2003-4-24 2318 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, peninsula c. 2 miles north of Lodoga, Big Boot camping area 365 Comment
  UC769882  Scribneria bolanderi R. F. Hoover 3207 Colusa Upper Sand Creek Comment
  POM21047  Scrophularia californica Roxana Stinchfield 1916-6-18 305 Colusa Timber near College City Comment
  UC71646  Scrophularia californica Miss Alice King 1905-1 Colusa College City Comment
  JEPS73453  Scutellaria californica L. R. Heckard 1972-7-8 3053 Colusa on n side of ridge running se of Snow Mountain (West Peak); West Peak 2011 Comment
  JEPS80801  Scutellaria californica L. R. Heckard and J. C. Hickman 1981-7-30 5772 Colusa heading up East Ridge of Snow Mountain, West Peak 1950 Comment
  UCD66954  Scutellaria californica Ellen Dean; Davis Botanical Society 2008-5-31 4998 Colusa west of I-5 at Maxwell, along Goat Mountain Road following Little Stoney Creek, Little Stoney Creek Canyon. 414 Comment
  CHSC79519  Scutellaria tuberosa B. Castro; L. P. Janeway 2000-5-2 1108 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 234 Comment
  UC71637  Scutellaria tuberosa Miss Alice King 1905-1 Colusa College City Comment
  JEPS73510  Sedum obtusatum subsp. boreale L. R. Heckard 1972-7-10 3128 A Colusa among rocks of promontory on se corner of Snow Mt. overlooking and 3 mi nw Fouts Springs; se corner Snow Mt., nw of Fouts Springs 1828 Comment
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Aug 17 2011
  RSA700356  Senecio clevelandii L. P. Janeway, B. Castro 2001-6-3 7103 Colusa At Buck Flat: East side of Walker Ridge at head of Gaither Canyon; about 1.3 km. south-southeast of Baldy Mountain. 872 Comment
  CHSC94415  Senecio sylvaticus Lowell Ahart 2006-8-9 13158 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS110106  Senecio sylvaticus Lowell Ahart 2006-8-9 13158 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  CHSC6689  Senecio vulgaris Marilyn Lee 1968-3-30 119 Colusa North side of Hwy. 16 at junction of Hwy. 16 and Hwy. 20. Between Hwy. 16 and Cache Creek. Comment
  UCD58126  Senecio vulgaris Ellen Dean; PLB 102 Class 2007-4-29 3722 Colusa Payne Ranch. Lands to the SW of the junction of Hwy. 16 and Hwy. 20. Thompson Canyon, near junction with Craig Canyon. Thompson Creek. 362 Comment
  CAS-BOT-BC364516  Senecio vulgaris Roxana S. Ferris 1926-4-21 6273 Colusa Sycamore Slough 2 miles west of Sycamore Comment
  CHSC94402  Setaria viridis Lowell Ahart 2006-8-9 13137 A Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UCD92837  Setaria viridis Beecher Crampton 1958-6-26 4974 Colusa along Grieve Road, 5.5 miles south of College City. Comment
  CHSC79528  Sidalcea diploscypha B. Castro; L. P. Janeway 2000-5-1 1104 A Colusa Vicinity of Sites and Grapevine Creek. 365 Comment
  JEPS120911  Sidalcea diploscypha Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18647 Colusa Rocky serpentine outcrop on the N side of Hwy 20, just E of the Lake County line, 12.2 air miles ENE of the town of Clear Lake, 17.1 air miles W of Williams Comment
  UCD23423  Sidalcea diploscypha David Rhode 1977-4-30 22 Colusa Bear Valley, 2.1 miles north of Wilbur Springs. Dry gravel, west facing slope in sparse valley grassland pasture. Comment
  CHSC45331  Sidalcea keckii Vernon Oswald 1984-5-2 1164 Colusa Along the access road on the e side of East Park Res. 0.3 mi n of Site-Lodoga Rd. 365 Comment
  JEPS105737  Sidalcea keckii David Gowen 2004-5-18 84 Colusa About 1.5 miles south of Stonyford. Road shoulder on the east side. Comment
  JEPS116996  Sidalcea keckii David Gowen 2008-5-24 922 Colusa Sites Ladoga Rd., northeast of Ladoga, ca. 1.9 miles southwest of Grapevine Pass. Comment
  JEPS123189  Sidalcea keckii David Gowen 2009-5-6 1014 Colusa Eastside of Hwy 20, about 16 miles west of Williams, near milepost 6.42 (from county line?). Comment
  UC852801  Silene californica A. A. Heller 1937-4-24 15351 Colusa on Highway #20, 15 mi w Williams; w of Williams Comment
  POM914478  Silene californica L. S. Rose 1936-4-27 36179 Colusa 11 miles NW of Rumsey. 305 Comment
  UCD111674  Silene campanulata Christopher Mallek 2008-1 s.n. Colusa Frenzel Creek. 654 Comment
  CDA12223  Silene campanulata subsp. glandulosa G. F. Hrusa 1993-5-2 10861 Colusa Frenzel Creek Research Natural Area; Mid-canyon of Frenzel Creek, tributary of Little Stony Creek. Comment
  HSC45722  Silene gallica M. Alcasas 1978-4-22 38 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  CAS-BOT-BC388980  Silene laciniata subsp. californica Lewis S. Rose 1936-4-27 36179 Colusa 11 mi. NW. of Rumsey 304 Comment
  SEINET11262894  Silene laciniata subsp. californica Richard R. Halse 2014-3-25 9036 Colusa Along the Bear Valley Road ca. 1.8 miles W NW of its junction with State Hwy 20.; 0 378 Comment
  SEINET8879658  Silene laciniata subsp. californica R. R. Halse 2014-3-25 9036 Colusa Along the Bear Valley Road, ca 1.8 miles WNW of its junction with State Hwy 20. 378 Comment
  UCD56665  Silene laciniata subsp. californica Jack Alderson 2007-3-25 1 Colusa BLM Payne Ranch. Destinella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 555 Comment
  UCD23381  Silene laciniata subsp. californica Beverly Ortiz 1978-4-8 16 Colusa Rhizomes spreading horizontally beneath the ground, stems pubescent, flowers red. Moist soil, growing in a litter layer, partially shaded by shrubs, growing on flat on slope. 2 miles north of the intersection of Highway 16 and Highway 20. 408 Comment
  UCD99009  Silene laciniata subsp. californica Kathleen A. Robson 1981-5-25 41 Colusa from Stonyfield, take Fouts Spring Road 8 miles west to Fouts Springs, continue 1 mile West along roadside. 579 Comment
  JEPS83163  Sinapis alba L. R. Heckard with J. Hickman 1980-7-3 5332 a Colusa SW Snow Montain, just W of Summit Springs 1548 Comment
  UCR238925  Sinapis alba George K. Helmkamp, E. A. Helmkamp 2012-2-9 18530 Colusa Sacramento Valley, River Road, 7.1 miles north of Colusa; east side of Sacramento River 18 Comment
  CAS-BOT-BC74903  Sinapis arvensis Roxana S. Ferris 1917-4-12 513 Colusa 4 mile east of Williams. Comment
  CHSC110364  Sinapis arvensis Richard R. Halse 2010-3-20 7826 Colusa Along State Hwy 20 ca. 5.4 miles wwest of Colusa (junction of State Hwys 20 and 45). 17 Comment
  UCD61438  Sisymbrium altissimum Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3883 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1000 ft NNW of parking lot. 314 Comment
  UCD63623  Sisymbrium altissimum Craig D. Thomsen 2008-3-21 2720 Colusa BLM Payne Ranch. 0.25 mile south of intersection of Hwy 16 and Hwy 20. Between Bear Creek and Hwy 16. Comment
  CHSC115383  Sisymbrium orientale Lowell Ahart 2015-4-1 19993 Colusa Burned over in 2012, rocky serpentine outcrop on the north side of State Highway 20, 1/2 mile east of Lake County Line, 12 miles (air) east-northeast of Clear Lake (town), 17 miles (air) west of Williams. Inner Coast Range. 520 Comment
  HSC31314  Sisyrinchium bellum Carter Schleicher 1974-5-4 27 Colusa 0.75 mi. from T junction of Walker Ridge Rd. and Indian Valley, near Clyde Mine 854 Comment
  UCD64292  Sisyrinchium bellum Craig D. Thomsen 2000-4-12 2134 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCD82502  Sisyrinchium bellum Craig Thomsen; G. Harrington 2009-5-12 2861 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  HSC59568  Sisyrinchium bellum Rick Lundquist 1979-4-14 22 Colusa Bear Valley Rd., 13 mi. N of Hwy. 20 396 Comment
  IRVC29851  Smilacina racemosa Mark A. Elvin, Mark S. Brunell, David Isle 2006-8-3 5038 Colusa Snow Mtn; Summit Spring Trail; between Snow Mtn West summit and Cedar Camp. Southern Northern Inner Coast Ranges 2012 Comment
  JEPS80060  Smilacina racemosa L. R. Heckard with J. Hickman 1979-6-15 5059 Colusa saddle trail between east peak and west peak Snow Mt 2103 Comment
  CHSC63425  Solanum elaeagnifolium Vernon H. Oswald 1994-7-18 6411 Colusa Near the S boundary of the Sacramento National Wildlife Refuge located S of Willows, on the S side of Cell 3 of Pool 11 bordering Hunters Creek. Along a levee road. 21 Comment
  CHSC114061  Solanum parishii Richard R. Halse 2012-3-29 8456 Colusa Along State Hwy. 20 ca. 6.8 miles northeast of its junction with State Hwy16 176 Comment
  CHSC57525  Solanum parishii Shelly A. Kirn 1991-4-6 12 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. 143 Comment
  HSC41467  Solanum parishii Richard Runyon 1977-4-24 35 Colusa Along Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  HSC42017  Solanum parishii M. A. Baker 1977-4-24 222 Colusa Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  HSC62930  Solanum parishii Kenneth Clark 1979-4-14 103 Colusa Bear Valley Rd. 3.9 mi. N of State Rte. 20 412 Comment
  NY821077  Solanum parishii R. C. F. Bacigalupi 1950-4-25 3175 Colusa "Grapevine Grade" to Lodoga, ten miles northwest of Sites Comment
  UCD57555  Solanum parishii Andrew Pedersen; with Plant Biology 102 2007-4-29 4 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Meadow on the west side of State Route 16, ca. 2 road miles south of intersection with State Route 20. West side of Bear Creek, at confluence with Craig Creek. 304 Comment
  CHSC94521  Solanum physalifolium var. nitidibaccatum Lowell Ahart 2006-8-22 13223 Colusa South side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford. 349 Comment
  CDA6240  Solanum pseudocapsicum M. H. Handley 1961-7-24 Colusa 0 Comment
  CAS-BOT-BC157050  Solanum umbelliferum R. S. Ferris 1917-4-14 590 Colusa Along Sand Creek, Arbuckle - Rumsey Road Comment
  UC1733755  Solanum umbelliferum Kay H. Beach 1940-5-16 658 Colusa Colusa and Lake county line Comment
  JEPS105309  Solidago elongata Dean W. Taylor 1994-10-7 14713 Colusa Little Stony Creek along Goat Mountain Road 2.1 miles West from junction Lagoda-Stonyford Road, 426 Comment
  JEPS127581  Solidago velutina subsp. californica David Isle with Terril Wolt 2016-7-15 2168 Colusa North Coast Ranges: ~5 1/2 miles W of Stonyford off S side Fouts Springs Road M10 (18N01.2). Also ~5/8 mile SE of M10 Junction with Trough Sp R Rd M5 (18N07). Comment
  UCD55462  Solidago velutina subsp. californica Ellen Dean; Gordon Harrington 2006-10-6 3286 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 381 Comment
  UCD72466  Sonchus asper Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3800 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. Bank of Bear Creek near north end of bridge, west side of creek. 260 Comment
  CAS-BOT-BC390101  Spergularia bocconi A. A. Heller 1916-6-9 12392 Colusa Along the state highway near Colusa Comment
  CHSC29847  Spergularia macrotheca var. leucantha K. R. Stern 1980-6-30 6658 Colusa Vernal pool area, south border Colusa National Wildlife Refuge. 45 Comment
  CHSC53948  Spergularia marina Vernon H. Oswald 1991-4-21 4525 Colusa Two Mile Rd, 3.7 mi south of Maxwell Colusa Rd. On a flat along edge of road through rice fields. 27 Comment
  SEINET8883999  Spergularia marina R. R. Halse 2012-3-28 8455 Colusa Williams, along 5th Street between intersections with C and D Streets, near railroad tracks. 24 Comment
  CHSC94290  Stachys ajugoides var. rigida Lowell Ahart 2006-8-9 13091 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  CHSC94516  Stachys ajugoides var. rigida Lowell Ahart 2006-8-22 13235 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS110534  Stachys ajugoides var. rigida Lowell Ahart 2006-10-31 13539 Colusa On the south side of road M 10, about 6 miles by road west of Stonyford 583 Comment
  CHSC106246  Stachys albens B. Castro; L. P. Janeway 2001-6-3 1256 Colusa Inner North Coast Ranges. Spring at Grapevine flat, on top of Walker Ridge about 0.5 mi E of Baldy Mountain. East-facing slope/bench with large springy/meadowy area. 880 Comment
  JEPS104386  Stachys albens Lowell Ahart 2003-7-14 10381 -A Colusa Along a stream, field on the south side of Highway 20, ca 2 mi sw of the intersection of Highway 20 and Bear Valley Rd, ca 21 mi (by road) sw of Williams. 520 Comment
  JEPS120807  Stachys albens Lowell Ahart 2013-10-1 19079 Colusa Strand of East Park Reservoir, about 2.5 air miles SE of Stonyford, about 2.5 miles NW of Lodoga, about 10 air miles NW of Sites. Comment
  UCD55468  Stachys albens Ellen Dean; Gordon Harrington 2006-10-6 3288 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 362 Comment
  UCD64039  Stachys albens Craig D. Thomsen 2000-6-23 2417 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, Colusa Co. milepost 2.63. 304 Comment
  RSA0109095  Stachys pycnantha L. Ahart 2006-8-9 13092 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3.5 miles (air) west of Stonyford. 455 Comment
  RSA724895  Stachys rigida subsp. quercetorum L. Ahart 2006-8-22 13235 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
  UCD64273  Stellaria media Craig D. Thomsen 2000-3-31 2074 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  CHSC94316  Stephanomeria paniculata Lowell Ahart 2006-8-9 13099 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  RSA703243  Stephanomeria virgata subsp. pleurocarpa L. Ahart 2004-10-4 11424 Colusa On the east side of Leesville Road, about 4.7 miles by road SE of the intersection of Bear Valley Road, Leesville Ladoga road and Leesville Road, NE of Bear Valley. 370 Comment
  CHSC107966  Stipa pulchra B. Castro; L. Janeway 2011-4-27 1869 Colusa Sacramento Valley. Extreme W edge of Sacramento Valley; ca 5 air mi NW of Maxwell, 0.4 mi southeast of Funks Reservoir on top of N-trending ridge southeast of outlet toTehama-Colusa Canal. In grassy hills about 80 ft N of the canal. 74 Comment
  UCD72374  Streptanthus batrachopus A. M. Shapiro 1988-6-6 s.n. Colusa Goat Mountain Road. 762 Comment
  CAS-BOT-BC61238  Streptanthus breweri Alice Eastwood; John Thomas Howell 1938-5-16 5627 Colusa Lake-Colusa county line. On road to Williams. Comment
  UCD163238  Streptanthus breweri Craig D. Thomsen 2000-6-23 2374 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 1 mile west of Hwy 20/16 intersection (about 1/8 mile east of vista point). 345 Comment
  UCD164311  Streptanthus breweri Ryan O'Dell 2010-7-1 s.n. Colusa UTM zone 10, 553253, 4318610. [UTM coordinates place this location along Bear Valley Rd., north of HWY 20.] 381 Comment
  UCD38808  Streptanthus breweri Beecher Crampton 1958-5-19 4812 Colusa Colusa County, Little Stony Creek canyon, west of Ladoga. Comment
  CAS-BOT-BC61237  Streptanthus breweri Roger Raiche 1985-5-25 50460 Colusa Walker Ridge, Brim Road, near intersection West Walker Road. 637 Comment
  HSC62796  Streptanthus breweri M. A. Ericksen 1979-4-14 207 Colusa Adjacent to Bear Valley Rd., 3.9 mi. from Hwy. 20 Comment
  HSC72216  Streptanthus breweri Thomas W. Nelson, Jane P. Nelson 1980-6-24 5872 Colusa Colusa-Lake County line, along trail to Snow Mtn., 0.5 mi. from trailhead 1616 Comment
  JEPS75714  Streptanthus breweri L. R. Heckard 1974-9-9 3839 Colusa trail up from Summit Springs (bare w-facing slope, Colusa-Lake County line); Snow Mt. 1645 Comment
  UC1292771  Streptanthus breweri Freed W. Hoffman 2784 Colusa N of road from Leesville to Bartlett Springs, along the summit between Colusa and Lake counties Comment
  UC1051693  Streptanthus breweri var. breweri Helen K. Sharsmith 1953-6-18 4256 Colusa Candy Bucket Spring Inner North Coast Ranges, Mendocino National Forest (road from Stoneyford to Mill Spring) 609 Comment
  UC1552822  Streptanthus breweri var. breweri Frederica Bowcutt 1985-5-10 510 Colusa road bank along Bear Valley Rd about 3 mi se Wilbur Springs (1 mi w of Hwy 20); Wilbur Springs 15' Quad Comment
  UC956515  Streptanthus breweri var. breweri Freed W. Hoffman 1948-6-28 Colusa 1.8 mi n Fouts Springs; Red Bridge 441 Comment
  UCD57303  Streptanthus breweri var. breweri Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3674 Colusa BLM Payne Ranch. Lands to the southwest of junction of Hwy. 20 and Hwy. 16. Thompson Canyon, near juncture with Craig Canyon. Above Thompson Creek. 366 Comment
  UCD58119  Streptanthus breweri var. breweri Ellen Dean; PLB 102 Class 2007-4-29 3714 Colusa Payne Ranch. West of Hwy. 16. Ca. 2 road miles S of junction of Hwy. 20 and Hwy. 16. Craig Canyon. Along unimproved road. 328 Comment
  UCD63121  Streptanthus breweri var. breweri Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4951 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20. 405 Comment
  UCD66907  Streptanthus breweri var. breweri Jack Alderson 2008-4-27 s.n. Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Slopes to the WNW of Cowboy Camp on the west side of Bear Creek. 427 Comment
  SEINET11993369  Streptanthus breweri var. hesperidis Unknown 1985-1 50460 Colusa Walker Ridge, Brim Rd nr intersection W Walker Ridge Rd Comment
  UC1178879  Streptanthus glandulosus subsp. glandulosus Herbert L. Mason 1941-4-5 12408 Colusa on road between Maxwell and Stonyford just w summit of grade Comment
  UC1552823  Streptanthus glandulosus subsp. glandulosus Frederica Bowcutt 1985-5-10 513 Colusa about 3 mi se Wilbur Springs (1 mi w of Hwy 20, base of steep s-facing hillsides); Wilbur Springs 15' Quad, Big Valley Shale Barrens Comment
  UC764910  Streptanthus glandulosus subsp. glandulosus R. F. Hoover 1938-4-24 3227 Colusa ridge between Venado and Leesville Comment
  UCD167944  Streptanthus morrisonii James Neilson 1982-7-1 4090 Colusa Frenzel Creek. (Exact location unknown. Coordinates estimated by label maker.) Comment
  UCD167946  Streptanthus morrisonii James Neilson 1982-7-1 4089 Colusa About 6 miles west of Lodoga, about 1 mile south of mouth of Frenzel Creek. (Exact location unknown. Coordinates estimated by label maker.) Comment
  HSC92004  Styrax redivivus S. Morrissette, J. Williams, K. Kopper 1994-4-24 25 Colusa Bear Valley Rd. 0.5 mi. S of junction with Brimm Rd. 457 Comment
  UCD119091  Styrax redivivus Tom Aldrich 1975-5-25 17 Colusa 2.3 miles west of Leesville Grade, Wilbur Springs Road junction, toward Walker Ridge. Comment
  UCD119113  Styrax redivivus D. Sanchez-Mata; P. Rodriguez-Rojo 1997-7-25 s.n. Colusa Williams (c. 15 miles West). Blue Ridge near Bear Creek. 350 Comment
  UCD163324  Suaeda nigra Craig D. Thomsen 1997-4-19 1906 Colusa Wilbur Springs. About 4 miles north of Hwy 20. Comment
  CAS-BOT-BC97651  Symphyotrichum chilense Roxana Stinchfield 1916-7-11 437 Colusa Sycamore Slough Road Comment
  UCD136692  Symphyotrichum subulatum var. parviflorum P. B. Kennedy 1925-9-18 s.n. Colusa Cortena. Comment
  CAS-BOT-BC99394  Symphyotrichum subulatum var. parviflorum A. A. Heller 1939-10-1 15484 Colusa places between Williams and Maxwell Comment
  JEPS81289  Taeniatherum caput-medusae L. R. Heckard and J. C. Hickman 1982-7-5 5900 Colusa Summit Springs, s side of Snow Mountain Summit Springs; Snow Mountain, Summit Springs 1500 Comment
  UCD86110  Taeniatherum caput-medusae Beecher Crampton 1958-5-19 4788 Colusa 8.5 miles east (probably west) of Williams, just off of Highway 20. Comment
  CDA5072  Tamarix parviflora T. C. Fuller 1960-6-15 4479 Colusa Bear Creek, 2 miles north of Yolo Co. line. 0 Comment
  HSC62813  Tamarix parviflora J. M. DiTomaso 1979-4-14 873 Colusa Bear Valley Rd., 3.9 mi. N of S.R. 20, next to Bear Creek. 412 Comment
  HSC62945  Tamarix parviflora Marla J. Carollo 1979-4-14 29 Colusa Bear Valley Rd., 3.9 mi. N of Hwy. 20, next to Bear Creek. 412 Comment
  CHSC59989  Tetrapteron graciliflorum Terri Simon 1975-4-20 14 Colusa Field. Bear Valley Road, 8.7 miles north of State Highway 20. Comment
  UCD163838  Tetrapteron graciliflorum Craig D. Thomsen 2001-4-12 2467 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCR47922  Thelypodium flavescens Walter C. Overton 1980-4-14 s.n. Colusa Side canyon on road into Bear Valley, c. 1 mi. north of junction of State Hwys 16 and 20. Comment
  UCD146699  Thinopyrum intermedium G. F. Hrusa 1998-6-19 14614 Colusa above upper Little Stony Creek. Goat Mountain Road around 1.5 km west of campground. 485 Comment
  HSC72161  Thysanocarpus curvipes J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9536 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  CAS-BOT-BC88159  Thysanocarpus curvipes Roxana S. Ferris 1917-4-14 553 Colusa 7 miles west of Arbuckle. Comment
  SEINET3166341  Thysanocarpus curvipes subsp. curvipes P. J. Alexander, C. D. Bailey 2009-4-1 973 Colusa East slope of the North Coast Ranges, Mendocino National Forest, east side of Mill Creek 0.8 miles SSW of its confluence with South Fork Stony Creek, 6.3 miles WSW of Stonyford. 509 Comment
  UCD56905  Thysanocarpus curvipes subsp. curvipes Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3508 Colusa BLM Payne Ranch. In Craig Canyon. Southwest of intersection of Hwy. 16 and Hwy. 20. 326 Comment
  CHSC57362  Thysanocarpus laciniatus Steven Triano 1987-4-4 18 Colusa Salt Canyon, n side of Salt Creek, ca. 30 ft s of Hwy 20, 11 mi wsw of Williams. 143 Comment
  CHSC62928  Thysanocarpus laciniatus Vernon H. Oswald; Lowell Ahart 1994-4-6 6065 Colusa Goat Mtn. Rd. at Sullivan Creek, 1.2 mi SW of Digger Pine Flat, S of Stonyford. On the slopes bordering Sullivan Creek. 469 Comment
  UC72283  Tofieldia occidentalis subsp. occidentalis Milo S. Baker 1898-8-22 552 Colusa along a stream Bear Valley Mountains Comment
  JEPS95519  Tonella tenella Vernon H. Oswald and L. Ahart 1994-4-6 6068 Colusa T17N R7W SE1/4 SW1/4 Sec. 36, 1540 ft, Chaparral. Goat Mtn. Rd. at Sullivan Creek, 1.2 mi SW of Digger Pine Flat, S of Stonyford 469 Comment
  UCD41211  Torilis arvensis John Snelling 1986-5-17 3 - Colusa Maxwell-Sites Road, 0.95 mi. east of Sites. Comment
  UCR212306  Torilis arvensis Craig D. Thomsen 2001-5-24 2530 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, south side of Hwy 20, c. 0.5 mi west of Hwy 20/16 intersection (between mileposts 2.17 and 2.63) 325 Comment
  UCD41197  Torilis nodosa James Salyards 1986-5-17 86 - Colusa Along Maxwell-Sites Road, 0.95 mi. east of Sites. Comment
  UCD83753  Torreya californica Ellen Dean; G. Harrington, K. Mawdsley, J. Shepard 2010-5-1 5950 Colusa Walker Ridge. Along Walker Ridge Road. 10 road miles N of intersection with Hwy 20. Just N of radio tower at Cold Spring Mountain on border with Lake County. 971 Comment
  UCD93191  Torreyochloa pallida var. pauciflora Freed W. Hoffman 1948-6-28 2504 Colusa Lower Letts Valley, western part of county. Comment
  UCD66702  Toxicoscordion fontanum Craig D. Thomsen 2001-4-12 2450 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UCD139864  Toxicoscordion fremontii Kim E. Steiner 1978-4-29 200 Colusa Walker Ridge Road; 1.5 miles N of State Hwy 20. 777 Comment
  UCD15678  Toxicoscordion fremontii Anne B. Overturf 1989-4-8 12 Colusa Colusa/Lake County: Walker Ridge. 658 Comment
  CHSC49670  Toxicoscordion micranthum Vernon Oswald 1984-5-2 1170 Colusa Fouts Springs Rd. (M10) in Mendocino National Forest, 5.9 mi w of Stonyford. 60 Comment
  CHSC62951  Toxicoscordion paniculatum Vernon H. Oswald; Lowell Ahart 1994-4-6 6073 Colusa Goat Mtn. Rd. 1.5 mi S of Sullivan Creek Bridge, SW of Digger Pine Flat, S of Stonyford. 518 Comment
  UCD139884  Toxicoscordion venenosum var. venenosum W. K. Sutton 1931-2-26 2176 Colusa Maxwell. Comment
  CAS-BOT-BC323063  Trichocoronis wrightii J. M. Tucker 1953-8-28 2675 Colusa 7 miles east of Arbuckle Comment
  HSC87773  Trichocoronis wrightii J. M. Tucker 1953-8-28 2675 Colusa Rice field 7 mi. E of Arbuckle Comment
  POM50995  Trichocoronis wrightii Roxana Stinchfield 1916-7-11 s.n. Colusa Davis, near Sycamore slough Comment
  UCD136900  Trichocoronis wrightii S. Galen Smith; Malcolm A. Nobs 1949-9-10 1890 Colusa 17 miles north of Knights Landing. Comment
  CHSC84248  Trichostema laxum Lowell Ahart 2003-7-14 10381 Colusa Along a drainage, field on the south side of Highway 20, about 2 miles southwest of the intersection of Highway 20 and Bear Valley Road, about 21 miles (by road) southwest of Williams. 520 Comment
  CHSC88578  Trichostema laxum L. P. Janeway 2001-6-6 7113 Colusa Inner North Coast Ranges. Eaton Springs, about 2.4 km east of Walker Ridge Road. Meadow opening. 713 Comment
  CHSC94298  Trichostema laxum Lowell Ahart 2006-8-9 13093 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  RSA0118601  Trichostema laxum Lowell Ahart 2013-10-1 19081 Colusa Inner North Coast Range. Strand of East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  SEINET13710182  Trichostema laxum Lowell William Ahart, Lowell William Ahart 2003-1 10381 Colusa 2 Mi. SW Jct. Hwy 20 with Bear Valley Road, about 21 Rd. Mi. SW of Williams (39 Deg 00'23.7"N, 122 Deg 23'59.5"W) 1708 Ft. 521 Comment
  UC725735  Trichostema laxum A. A. Heller 1941-9-22 Colusa just E of Lake County line Comment
  RSA161330  Trichostema oblongum Peter H. Raven, R. Snow 1959-9-11 14417 Colusa Openings in forest of Pinus ponderosa, Dark Hollow Creek. 1860 Comment
  UCD169981  Trichostema parishii G. F. Hrusa; Dmitri Geltman 1992-8-18 15242 Colusa Along Leesville Rd., about 1 mi S of Lodoga. 320 Comment
  UCD81252  Trifolium Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5417 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. South of the canyon that is located to the south of Brophy Canyon and north of the road leading up from the confluence of Bear and Cache Creeks. 365 Comment
  UCSC004744  Trifolium Randall Morgan 1995-5-16 2628 Colusa Bear Valley Comment
  UCSC005368  Trifolium Randall Morgan 1995-5-16 2628 Colusa Bear Valley Comment
  HSC72139  Trifolium albopurpureum J. P. Smith, Jane P. Nelson, Thomas W. Nelson 1978-4-2 9571 Colusa Bear Valley Rd., 2.1 mi. from its junction with Hwy. 20 366 Comment
  JEPS66026  Trifolium albopurpureum Alice King May 1906 Colusa College City Comment
  UCSC010478  Trifolium albopurpureum Dylan M. Neubauer, Tim Forsell 2016-3-30 590 Colusa (NCoRI) Bear Valley, Bear Valley Road, 0.67 air miles south-southeast of junction with Wilbur Springs Road 381 Comment
  POM278017  Trifolium albopurpureum Lyman D. Benson 1933-4-16 4334 Colusa 5 miles south of Arbuckle, Sacramento River Watershed, Sacramento Valley. 91 Comment
  RSA590138  Trifolium albopurpureum Michael A. Vincent, Robert Rhode, Karl Vincent 1996-3-30 7292 Colusa Along Bear Valley Road, 4.6 miles N of junction Wilbur Springs Road Comment
  CHSC115392  Trifolium bifidum var. bifidum Lowell Ahart 2015-4-10 20009 Colusa In a small meadow, on the south side of Brim Road, about 2 miles west of the intersection of Bear Valley Road and Brim Road, about 17 miles (air) west of Williams. 500 Comment
  JEPS124214  Trifolium bifidum var. bifidum Lowell Ahart 2015-4-10 20009 Colusa About 2 miles west of the intersection of Bear Valley Road and Brim Road, about 17 miles (air) west of Williams. Comment
  UC80312  Trifolium bifidum var. bifidum Katharine Brandegee Apr 1889 Colusa Colusa County Comment
  UCD107898  Trifolium bifidum var. bifidum E. W. Laubscher 1958-3-7 8 Colusa State Highway 16, 2 miles N of Yolo-Colusa county line. Comment
  CHSC107959  Trifolium bifidum var. decipiens B. Castro; T. Boullion 2011-4-20 1842 Colusa Sacramento Valley. Extreme W edge of Sacramento Valley; ca 5 air mi NW of Maxwell, 0.8 mi SE of Funks Reservoir and 1000 ft northeast of Tehama-Colusa Canal. Off north end of vernally moist swale which extends northeast of large +- saline/alkaline wetland/marsh, in grassy uplands. 49 Comment
  CHSC112218  Trifolium bifidum var. decipiens Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18631 Colusa Inner North Coast Range. On the north side of State Highway 20, just east of Lake County Line, 12.2 mile (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  UC638666  Trifolium ciliolatum Ethel Crum 1938-5-7 2016 Colusa 4.2 mi n Rumsey; Inner North Coast Ranges, Comanche Hills 254 Comment
  UC80325  Trifolium depauperatum var. depauperatum Katharine Brandegee Apr 1889 Colusa Colusa Junction Comment
  JEPS89584  Trifolium depauperatum var. truncatum Dean W. Taylor 1992-4-16 12407 Colusa stony hillside ca. 0.4 mi. due w. from spillway into Little Stony Creek (East Park Reservoir); Inner N. Coast Range, Gilmore Peak Quad. 411 Comment
  UCD64260  Trifolium depauperatum var. truncatum Craig D. Thomsen 2000-3-31 2058 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCD64417  Trifolium depauperatum var. truncatum Craig D. Thomsen 2000-4-12 2165 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  JEPS121103  Trifolium dichotomum Lowell Ahart 2013-5-1 18667 Colusa On the E side of Bear Valley Road, about 2.5 road miles NW of intersection of Hwy 20 and Bear Valley Road. Comment
  CHSC9539  Trifolium fucatum L. V. Ritter 1969-4-30 229 Colusa Ca. 100 yds. w of the junction of Highway 20 and 16, ca. 50 yds. n of Highway 20. Comment
  UCR212285  Trifolium fucatum Craig D. Thomsen 2000-3-31 2047 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mi west of Hwy 20/16 intersection, milepost 3.00 310 Comment
  SEINET12161438  Trifolium fucatum S. M. Leary 1978-1 4 Colusa ca .3 mi W of Jct of Hwys 20 & 16, S side of Bear Creek, ca 18 mi SW of Williams. Wilbur >> 322 Comment
  SEINET5738242 Image available Trifolium fucatum Betty Hess 1973-1 11 Colusa 0.2 mile NW of junction of State Highways 16 and 20 on Bear Valley Road. Comment
  UCSB63950  Trifolium fucatum Foley, Michael-Anne 1983-4-9 Colusa Ca. 0.3 mi. W of jct. of Hwy. 20 and 16, S side of Bear Creek, ca. 18 mi. SW of Williams; Wilbur Springs Quadrangle, 15 ft., S central border of Sect. 36. T14N, R5W 320 Comment
  UCD64277  Trifolium hirtum Craig D. Thomsen 2000-3-31 2076 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCR206382  Trifolium hirtum George K. Helmkamp, E. A. Helmkamp 2009-5-20 14754 Colusa Inner North Coast Ranges, along CA-16, 1.8 miles north of the Yolo County line 271 Comment
  JEPS121121  Trifolium microcephalum Lowell Ahart 2013-5-1 18693 Colusa N of the wash and Hwy 20, just E of Lake County line, 12.2 air miles ENE of the town of Clear Lake, 17.1 air miles W of Williams. Comment
  JEPS110476  Trifolium obtusiflorum Lowell Ahart 2006-8-9 13130 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  RSA0118786  Trifolium obtusiflorum Lowell A. Ahart 2013-5-1 18679 Colusa On the north side of the wash, north side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 567 Comment
  SBBG119886  Trifolium obtusiflorum L. Ahart 2006-8-9 13130 Colusa N side and under bridge across Stony Crk, just N of Stonyford 347 Comment
  UCD169352  Trifolium obtusiflorum Lowell Ahart 2013-5-1 18679 Colusa North side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. North side of wash. 566 Comment
  UCD82116  Trifolium obtusiflorum Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5644 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 839 Comment
  UCD82380  Trifolium obtusiflorum Craig Thomsen; G. Harrington 2009-5-12 2822 Colusa Colusa County. Walker Ridge. On moist flat just west of Walker Ridge Road, below turnoff to Eaton Springs. 944 Comment
  UCD82721  Trifolium obtusiflorum Craig Thomsen; G. Harrington 2009-5-14 2904 Colusa Colusa County on Walker Ridge: about 200 yds. south of spur road, 1/2 mile east of Walker Ridge Road, en route to Eaton Springs. 813 Comment
  UCSC011130  Trifolium obtusiflorum Lowell Ahart 2006-8-9 13130 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS80441  Trifolium repens L. R. Heckard and J. Hickman 1980-7-3 5370 Colusa sw slopes Snow Mtn (Summit Springs) 1554 Comment
  CHSC94405  Trifolium variegatum Lowell Ahart 2006-8-9 13131 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UCD109420  Trifolium variegatum Clinton C. Shock 1980-5-3 67 Colusa Bear Valley, about 12 miles north of State Highway 20. 384 Comment
  JEPS80211  Trifolium variegatum var. variegatum L. R. Heckard and J. Hickman 1980-7-3 5365 Colusa sw slope Snow Mtn (Summit Springs) 1554 Comment
  POM174578  Trifolium variegatum var. variegatum Roxana S. Ferris 1926-4-23 6435 Colusa Dry Creek near Stonyford. Comment
  UCD64420  Trifolium willdenovii Craig D. Thomsen 2000-4-28 2175 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCD82622  Triglochin maritima Craig Thomsen; G. Harrington 2009-5-12 2892 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  UCD149528  Trillium albidum Greg Kareofelas 2013-4-25 s.n. Colusa Colusa County; north of Lily Pond, Mill Valley Campground, along Forest Route AN02. In the Mendocino National Forest, between Snow Mountain and Goat Mountain. 1228 Comment
  UCD82723  Triodanis biflora Craig Thomsen; G. Harrington 2009-5-14 2906 Colusa Colusa County on Walker Ridge: south of spur road about 1/2 mile east of Walker Ridge Road, en route to Eaton Springs. 813 Comment
  CHSC79718  Triodanis perfoliata B. Castro; L. P. Janeway 2000-5-4 1133 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 246 Comment
  UCD163681  Triphysaria eriantha Craig Thomsen 1999-4-15 1982 Colusa Bear Valley. About 5 miles north of Hwy 20, west of Bear Valley Rd. Comment
  JEPS80779  Trisetum canescens L. R. Heckard and J. C. Hickman 1981-7-30 5752 Colusa Trout Creek Snow Mt. (se side of Snow Mt.) 1615 Comment
  HSC47744  Triteleia hyacinthina Thomas W. Nelson, Jane P. Nelson 1978-4-29 3949 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  UC1093631  Triteleia laxa Francia Chisaki and Gene B. Newcomb 1958-4-1 1105 Colusa on bank of road to Lodoga 2.6 mi n junction with road to Bartlett Springs Comment
  UCD64413  Triteleia laxa Craig D. Thomsen 2000-4-12 2140 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCR233442  Triteleia laxa George K. Helmkamp, E. A. Helmkamp 2011-4-1 17130 Colusa Eastern Foothills North Coast Ranges, Antelope Valley, along Maxwell-Sites Road, 0.4 miles southeast of Sites 93 Comment
  CAS-BOT-BC278172  Triteleia laxa Mona Bourell 1997-3-29 5809 Colusa Mendocino National Forest along road near Brittan Ranch, 0.1 mi. N of North Fork Campground Comment
  HSC85828  Triteleia laxa Jeff Dunk, Tallchief Comet, David Munger 1987-4-11 63 Colusa Bartlett Springs Rd. Comment
  SEINET3127298  Triteleia laxa M. A. King 1905-1 sn Colusa Near Arbuckle [hand written], collected near College City, Sacramento Valley [printed label Comment
  SEINET199006  Triteleia peduncularis Helen K. Sharsmith 1953-6-19 4247 Colusa Mendocino National Forest ; East slope of Snow Mountain on Bonny Doon Road 671 Comment
  UC1051722  Triteleia peduncularis Helen K. Sharsmith 1953-6-19 4274 Colusa e slope Snow Mountain (on Bonny Doon Road, Mendocino National Forest); Inner North Coast Ranges, Mendocino National Forest 670 Comment
  UC1299323  Triteleia peduncularis Freed W. Hoffman 1947-6-19 1660 Colusa Cooks Springs Cooks Springs (western Colusa County) Comment
  CHSC90201  Tropidocarpum gracile A. Francis 1989-4-1 1 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. 143 Comment
  HSC71308  Umbellularia californica Thomas W. Nelson, Jane P. Nelson 1979-4-12 4618 Colusa Along Stony Creek below Digger Pine Campground Comment
  JEPS80760  Umbellularia californica L. R. Heckard and J. C. Hickman 1981-7-29 5727 Colusa s side of High Rock near summit High Rock (s side of Snow Mountain); Snow Mountain, High Rock 1935 Comment
  CHSC89856  Uropappus lindleyi B. Castro; L. P. Janeway 2001-4-18 1237 Colusa Vicinity of Grapevine Creek, Sites-Lodoga Road, and Scotties Spring. On edges of low terrace just above riparian corridor paralleling dirt road, adjacent to perennial N-S-trending creek. 268 Comment
  JEPS124231  Uropappus lindleyi Lowell Ahart 2015-4-1 19997 Colusa Inner North Coast Range. 1/2 mile east of Lake County Line, 12 miles (air) east-northeast of Clear Lake (town), 17 miles (air) west of Williams. Comment
  UC71622  Uropappus lindleyi Miss Alice King 1905-1 Colusa College City Comment
  JEPS110102  Urtica dioica subsp. holosericea Lowell Ahart 2006-8-9 13172 Colusa East side of East Park Reservoir, about 1/2 mile north of Lodoga, west of the road from Lodoga to Maxwell 365 Comment
  CAS-BOT-BC404289  Urtica urens Roxana S. Ferris 1917-4-15 620 Colusa Sycamore Slough Comment
  CAS-BOT-BC479711  Velezia rigida Ann Howald 2003-5-29 2352 Colusa Inner North Coast Ranges: Indian Valley, east side of East Park Reservoir, c. 3.7 mi N of Lodoga, near Chisolm Cove Group Campground 378 Comment
  CHSC110425  Velezia rigida David Isle; Rhonda Isle 2011-7-6 1951 Colusa SW of Stonyford; N of Dennis Dr.; on gravelly flat about 85 yds NW of Salt Creek Bridge on Isle property. 374 Comment
  UCD72462  Velezia rigida Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3796 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. Near north end of bridge, west side of creek. 281 Comment
  UCR261639  Velezia rigida Ann Howald 2003-5-29 2352 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3.7 miles north of Lodoga, near Chisolm Cove Group Campground 378 Comment
  UCD61471  Verbascum blattaria Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3917 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Just west of parking lot on west side of Bear Creek. 312 Comment
  POM63857  Verbena lasiostachys Roxana Stinchfield 1916-7-8 375 Colusa Stinchfield Ranch, along Sycamore Slough Comment
  RSA725018  Verbena lasiostachys L. Ahart 2006-8-22 13212 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
  UCD68106  Verbena lasiostachys Kathleen A. Robson 1981-5-25 45 Colusa From Stonyford, take Fouts Springs Road 8 miles West to Fouts Springs, continue 1 mile West along roadside. 579 Comment
  JEPS75854  Verbena lasiostachys var. lasiostachys L. R. Heckard 1974-9-11 3940 Colusa meadow just e Foutch Camp; Snow Mt 1859 Comment
  CDA16103  Verbena lasiostachys var. scabrida G. F. Hrusa, Dmitri Geltman (LE) 1999-8-18 15250 Colusa North Coast Ranges; Goat Mtn. summit. 1706 Comment
  RSA0105550  Verbena lasiostachys var. scabrida Lowell Ahart 2013-10-1 19091 -A Colusa Inner North Coast Range. East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  RSA725015  Veronica catenata L. Ahart 2006-8-9 13127 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
  JEPS75716  Veronica serpyllifolia subsp. humifusa L. R. Heckard 1974-9-9 3842 Colusa just se of Foutch Camp (Snow Mountain); Snow Mountain 1889 Comment
  JEPS80088  Veronica serpyllifolia subsp. humifusa L. R. Heckard with J. Hickman 1979-6-16 5096 Colusa s of Milk Ranch Meadow (nw of West Peak, Snow Mountain); Snow Mountain 2011 Comment
  UCD67034  Vicia americana Ellen Dean; Davis Botanical Society 2008-5-31 5015 Colusa west of I-5 at Maxwell, Goat Mountain, ridge below summit off of Goat Mountain Road. 1734 Comment
  CHSC59717  Vicia americana var. americana Darci Field 1977-4-16 21 Colusa Ca. 0.3 mi w of jct of Hwys 20 and 16, s side of Bear Creek, ca. 18 mi s w of Williams. 321 Comment
  HSC45726  Vicia cracca Patricia Shesgreen 1978-4-22 45 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  UCD163870  Vicia villosa subsp. varia Craig D. Thomsen 2000-3-31 2109 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection. Comment
  CHSC86014  Vicia villosa subsp. villosa Jenny Marr; H. West, J. Lacey, C. Warren, N. Wight 1998-4-14 Colusa Vicinity of Grapevine Creek, Antelope Valley, and Sites-Lodoga Road. 121 Comment
  RSA0033768  Viola adunca Barbara Ertter 1989-7-1 8605 Colusa Road to Goat Mt. Lookout 1.7 mi. S of Rt M-10 (Bear Creek-Fouts Spring Rd) at head of S Fk Stony Creek, ca. 12 airmiles WSW of Stonyford. 1463 Comment
  HSC21779  Viola douglasii Charles Belshaw 1937-4-25 2820 Colusa North Coast Ranges: Cooks Springs Comment
  HSC72212  Viola douglasii Thomas W. Nelson, Jane P. Nelson 1980-6-24 5878 Colusa Along road to Snow Mtn. trail head at Summit Springs 1585 Comment
  JEPS73518  Viola douglasii L. R. Heckard 1972-7-10 3137 Colusa between Foutch Camp and Trout Creek crossing; Snow Mountain 1889 Comment
  UC1060635  Viola douglasii Francia Chisaki, Gene B. Newcomb 1958-4-1 1106 Colusa 2.1 mi s of Lodoga (by road side) Comment
  UC519681  Viola douglasii Victor Duran 1933-4-2 3379 Colusa Stonyford 304 Comment
  UCD110679  Viola douglasii Victor Duran 1933-4-2 3379 Colusa Stonyford. 304 Comment
  UCD15438  Viola douglasii Lisa Montang 1985-4-13 8 Colusa Bear Valley, 8.6 miles north of Bear Valley Road and Highway 20 intersection; 441 Comment
  UCD15679  Viola douglasii Anne B. Overturf 1989-4-8 11 Colusa Walker Ridge. 658 Comment
  UCD66963  Viola glabella Ellen Dean; Davis Botanical Society 2008-5-31 5007 Colusa West of I-5 at Maxwell, east slope of Goat Mountain, along Goat Mountain Road, Cedar Grove Campground. 1311 Comment
  CAS-BOT-BC203032  Vitis californica Roxana S. Ferris 1917-4-16 629 Colusa Near Sacramento River near Sycamore Slough Comment
  CAS-BOT-BC203034  Vitis californica Roxana S. Ferris 1926-4-22 6303 Colusa Sycamore Slough near Sycamore Comment
  UC18628  Vitis californica J. Burtt Davy May 1898 4284 Colusa near Princeton Comment
  UCD81717  Vitis californica Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5722 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones Spring area on W side of road, ca. 6.5 road mi N of junction with Hwy 20. W side of road. 833 Comment
  HSC87048  Vulpia microstachys Pat Daly, Rudy Galindo 1988-4-16 51 Colusa 21.6 mi. off Hwy. 20 on Brim Rd., via Walker Ridge Rd. 518 Comment
  UCD56920  Vulpia microstachys var. ciliata Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3523 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. In Craig Canyon. 334 Comment
  UC596025  Vulpia microstachys var. confusa R. F. Hoover 1938-4-23 3208 Colusa Upper Sand Creek Comment
  CAS-BOT-BC184158  Vulpia microstachys var. pauciflora Lewis S. Rose 36188 Colusa 15 miles north of Rumsey Comment
  JEPS75409  Vulpia microstachys var. pauciflora W. L. Jepson 1932-5-8 16290 Colusa Stonyford 365 Comment
  JEPS80186  Vulpia microstachys var. pauciflora L. R. Heckard and J. Hickman 1980-7-3 5338 Colusa ca 10 mi w Stonyford (just w of Summit Springs, sw Snow Mt, Colusa-Lake county boundary); Snow Mt. 1548 Comment
  UCD94505  Vulpia microstachys var. pauciflora Beecher Crampton 1958-4-21 4722 Colusa along State Hwy. 16, junction on Bear and Cache creeks, 7.4 miles northwest of Rumsey, on county line. Comment
  SEINET10604484  Vulpia microstachys var. pauciflora Roxana S. Ferris 1917-4-12 Ferris 495 Colusa 4 miles east of Williams Alkali Plains. Comment
  POM296602B  Vulpia myuros Lyman Benson 1935-3-27 6371 Colusa Williams, Sacramento River watershed. 91 Comment
  JEPS83807  Wyethia angustifolia L. R. Heckard and J. C. Hickman 1982-7-9 6011 Colusa below Summit Springs; Snow Mt. 1463 Comment
  HSC38355  Wyethia angustifolia J. P. Smith 1974-5-5 7365 Colusa Comment
  CHSC79968  Wyethia glabra L. P. Janeway; B. Castro 2000-5-4 6708 Colusa Vicinity of Grapevine Creek and Sites-Lodoga Road. 274 Comment
  UCD70173  Wyethia helenioides D. Sanchez-Mata 1998-7-10 s.n. Colusa Stonyford. Fouts Springs Road. Open interior live oak scrub chaparral (Quercus wislizenii var. frutescens) in deforested slopes. 640 Comment
  CHSC80347  Xanthium spinosum Caroline Warren; Jenny Marr, Heidi West, Natalie Wight 1998-6-11 Colusa Vicinity of Funks Creek and Logan Ridge. 106 Comment
  UC36807  Xanthium spinosum J. Burtt Davy May, 1898 4277 Colusa near Willows Comment
  CAS-BOT-BC383632  Xanthium spinosum Roxana Stinchfield 1916-7-8 400 Colusa Truck garden, Stinchfield ranch near Sycamore Comment
  JEPS110358  Zannichellia palustris Lowell Ahart 2006-8-22 13234 Colusa On the north side of Stony Creek, about 50 yards east of the north end of the bridge across Stony Creek, just north of Stonyford 347 Comment
  CHSC71426  Zeltnera muehlenbergii Vernon H. Oswald; Lowell Ahart 1998-7-15 9267 A Colusa Bartlett Springs Rd. 1.6 mi west of Bear Valley Rd. In a meadow. 487 Comment
  UCD55464  Zeltnera venusta Ellen Dean; Gordon Harrington 2006-10-6 3289 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 362 Comment
  UCD61456  Zeltnera venusta Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3902 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1 mile SW of parking lot. 390 Comment
  RSA262383  Zigadenus fremontii Rosalie B. Lopopolo 1967-4-29 34 Colusa Ca. 8 miles northwest of junction of Highway 16 and Highway 20, Bear Valley 402 Comment
  HSC31617  Zigadenus micranthus Maralyn O'Meara, Gary S. Lester 1974-5-4 343 Colusa Walker Ridge Rd., 0.7 mi. from junction with Little Indian Valley Rd. 854 Comment
  HSC31716  Zigadenus paniculatus Teresa Prendusi 1974-5-4 53 Colusa Beyond Clyde Mine 1/8 mi. 854 Comment
  RSA589935  Zigadenus venenosus Michael A. Vincent, Robert Rhode 1996-3-30 7306 Colusa Along Walker Ridge Road, 0.5 mile south of the junction with Brim Road Comment
  HSC31312  Zigadenus venenosus var. venenosus Carter Schleicher 1974-5-4 28 Colusa 0.75 mi. from T junction of Walker Ridge Rd. and Indian Valley, near Clyde Mine 854 Comment



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