Search Results — 2000 specimen records retrieved (1625 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/consortium/).
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? Specimen ID Determination * Collector Collection Date Collection Number County Locality Elevation in meters Feedback
  CAS-BOT-BC334173  Acer negundo var. californicum Roxana Stinchfield 1916-7-8 398 Colusa Sycamore Slough, Stinchfield Ranch Comment
  CAS-BOT-BC334174  Acer negundo var. californicum Alice Eastwood 1921-4-11 10245 Colusa Colusa Comment
  CAS-BOT-BC21710  Achillea millefolium Roxana S. Ferris 1917-4-14 586 Colusa 5 mi. west of Arbuckle Comment
  JEPS75040  Achnatherum lemmonii L. R. Heckard 1972-7-10 3135 Colusa w of Trout Creek; Snow Mt., Trout Creek 1828 Comment
  CAS-BOT-BC29879  Achyrachaena mollis Roxana S. Ferris 1926-4-21 6293 Colusa 3 miles west of Colusa 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
  HSC87056  Achyrachaena mollis P. A. Daly, Rudy Galindo 1988-4-17 56 Colusa 5.2 miles south of Bear Valley Road 390 Comment
  POM52917  Achyrachaena mollis Roxana S. Ferris 1917-4-12 s.n. Colusa 4 miles east of Williams. Comment
  UC75911  Achyrachaena mollis Miss M. Alice King 1905-1-1 Colusa near College City; Sacramento Valley Comment
  UCD56907  Achyrachaena mollis Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3510 Colusa BLM Payne Ranch. In Craig Canyon. Southwest of intersection of Hwy. 16 and Hwy. 20. 326 Comment
  UCD64428  Achyrachaena mollis Craig D. Thomsen 2000-4-28 2204 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
  UCD135734  Achyrachaena mollis Bruce 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
  CHSC77336  Acmispon americanus var. americanus Heidi West; Joyces Lacey-Rickert 1998-10-29 Colusa Vicinity of Antelope Valley and Sites. 109 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
  CHSC100288  Acmispon grandiflorus var. grandiflorus David Isle 1988-4-13 1516 Colusa Mendocino National Forest - North Coast Ranges. Middle Fork Stony Creek Watershed. Trough Springs Ridge on bank edge of 18N01 (M10), SE of junction with 18N07 (M-5). MDMB. 621 Comment
  HSC89865  Acmispon grandiflorus var. grandiflorus L. R. Heckard 1969-5-28 2236 Colusa Along Trough Spring Ridge road 1/2 mi. SW of junction with the Stonyford-Fouts Spring road (ca. 5 mi. W of Stonyford). 732 Comment
  CHSC81265  Acmispon rubriflorus L. P. Janeway; B. Castro 2001-4-25 7026 Colusa Vicinity of Grapevine Creek, Sites-Lodoga Road, and Eggman Canyon. 329 Comment
  SD247416  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 (Lodoga 7.5'Q) 423 Comment
  UCR261731  Acmispon rubriflorus Ann Howald 2003-6-9 2361 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
  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
  HSC72174  Acmispon wrangelianus J. P. Smith, Jane P. Nelson, Thomas W. Nelson 1978-4-2 9551 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  UCR261721  Acmispon wrangelianus Ann Howald 2003-5-30 2355 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
  JEPS80827  Aconitum columbianum L. R. Heckard and J. C. Hickman 1981-7-31 5799 Colusa e. side Snow Mt. (Dark Hollow Creek); , Dark Hollow Creek 1645 Comment
  CHSC114944  Adiantum jordanii Lowell Ahart 2015-4-1 19989 Colusa Northside 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. Chaparral. 520 Comment
  JEPS124234  Adiantum jordanii Lowell Ahart 2015-4-1 19989 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
  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
  CDA34336  Aeschynomene rudis R. Breckenridge, K. Hull 1990-9-13 Colusa south of Princeton. 0 Comment
  HSC66736  Aesculus californica J. P. Smith, J. O. Sawyer 1973-4-30 6365 Colusa Along Hwy. 20, 10.1 mi. W of Hwy. 5 at Williams Comment
  UCD81226  Aesculus californica Ellen Dean; K. Mawdsley, B. Rice, G. Harrington, and J. Alderson 2009-5-6 5563 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
  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
  JEPS75862  Ageratina occidentalis L. R. Heckard 1974-9-10 3887 Colusa s of East Peak (along intermittent spring of upper reaches of Dark Hollow Creek); Snow Mt., Dark Hollow Creek 2011 Comment
  UCD57716  Agoseris grandiflora Jordan Thompson; 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. Central/Eastern part of ranch. Craig Canyon. North side of Craig Creek on south side of unimproved road. 335 Comment
  JEPS80139  Agoseris grandiflora var. grandiflora L. R. Heckard with J. Hickman 1980-7-2 5299 Colusa ca 10 mi w, above Summit Spring entrance to Snow Mt trail Stonyford; Snow Mt. 1630 Comment
  CHSC59937  Agoseris heterophylla M. K. Hancharick 1989-4-1 7 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
  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
  UC2014169  Agoseris heterophylla Ellen Dean, G. Harrington, K. Mawdsley 2007-3-30 3500 Colusa Colusa County: BLM Payne Ranch. On the west side of Hwy. 16. Ca. 2 road miles south of junction of Hwy. 16 and Hwy. 20. Comment
  UCD65647  Agoseris heterophylla Craig D. Thomsen 2000-4-28 2188 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
  JEPS75878  Agrostis exarata L. R. Heckard 1974-9-10 3914 Colusa ne slope West Peak (Snow Mt); Snow Mt., West Peak 2072 Comment
  UCSB63779  Agrostis exarata Oswald, Vernon; Ahart, Lowell 1998-7-15 Colusa Bartlett Springs Rd; 1.6 mi W of Bear Valley Rd; T15N R5W Sect 7 487 Comment
  CHSC86116  Aira caryophyllea Jenny Marr; Heidi West, Joyce Lacey-Rickert, Caroline Warren 1998-5-8 Colusa Vicinity of Sites and Antelope Valley. In vernal pools. 91 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
  CAS-BOT-BC445317  Alisma lanceolatum Herbert L. Mason; Verne Grant 1946-9-5 13119 Colusa Road to Lake County, 1.6 miles west of Williams Comment
  UCR200661  Alisma triviale Craig D. Thomsen 2006-8-17 2711 Colusa BLM Payne Ranch, c. 0.25 mi. south of intersection between Hwy 16 and Hwy 20, near confluence of Hamilton Flat and Jackson Canyon drainages, c. 10 meters east of Bear Creek, west of Hwy 16 Comment
  UCD141781  Allium L. K. Mann 1958-5-3 s.n. Colusa about 0.8 mile toward Wilbur Springs from Junction of California Highway #16 and #20. Comment
  UCD141857  Allium L. K. Mann 1958-5-3 s.n. Colusa about 0.8 mile toward Wilbur Springs from Junction of California Highway #16 and #20. Comment
  UCD82470  Allium Craig Thomsen; G. Harrington 2009-5-12 2847 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. About 100 yds south of road (ravine with spring below). 707 Comment
  CHSC112205  Allium amplectens Lowell Ahart 2013-5-1 18682 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
  JEPS120965  Allium amplectens Lowell Ahart 2013-5-1 18682 Colusa Near a small drainage, N of the wash and 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
  JEPS56351  Allium amplectens W. L. Jepson 1932-5-8 16272 Colusa Lodoga 457 Comment
  JEPS73487  Allium amplectens L. R. Heckard 1972-7-9 3099 Colusa se slope of East Peak of Snow Mt. East Peak of Snow Mt. 2072 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
  UCR261630  Allium amplectens Ann Howald 2003-3-26 2291 A 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 417 Comment
  CHSC100263  Allium falcifolium David Isle 1990-6-6 1518 Colusa Mendocino National Forest - North Coast Ranges Middle Fork Stony Creek Watershed. Lower Summit Valley, east edge of rock outcrop. MDMB. 1670 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
  JEPS73488  Allium falcifolium L. R. Heckard 1972-7-9 3100 Colusa se slope of East Peak of Snow Mt. East Peak of Snow Mt. 2011 Comment
  UCD82517  Allium falcifolium Craig Thomsen; G. Harrington 2009-5-12 2875 a Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 713 Comment
  CAS-BOT-BC467302  Allium falcifolium Roxana S. Ferris 1926-4-23 6570 Colusa Dry Creek near Stonyford Comment
  CAS-BOT-BC467305  Allium falcifolium A. Burgard; J. Goldsmith; J. Kalt 1996-5-4 71 Colusa 8.4 miles north of Indian Resevoir Rd. 57 miles east of Hwy. 101 on Hwy 20 701 Comment
  UCD141854  Allium falcifolium Roman Gankin 1958-4-25 s.n. Colusa 4 miles west of Leesville. Near head of Bear Valley. 304 Comment
  SEINET12051857  Allium fimbriatum Unknown 1986-1 60124 Colusa W of Williams, Bear Valley area, Bear Valley Rd, ca .7 mi N of its origin at Rt.20 323 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
  CHSC112220  Allium fimbriatum var. purdyi Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18641 Colusa Inner North Coast Range. On the 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
  HSC48465  Allium fimbriatum var. purdyi J. P. Smith 1978-4-22 9744 Colusa Bear Valley Rd., 1.2 mi. from its junction with Hwy. 20 412 Comment
  RSA161099  Allium fimbriatum var. purdyi Peter H. Raven 1962-5-31 17908 Colusa Highway 20, 2.5 miles east of Lake County Line Comment
  RSA296770  Allium fimbriatum var. purdyi Thomas W. Nelson, Jane P. Nelson 1978-4-29 3928 Colusa Along Bear Valley Rd. , 2 miles form jct with Hwy 20. 366 Comment
  RSA32008  Allium fimbriatum var. purdyi A. A. Heller 1942-5-29 s.n. Colusa 0.5 miles east of the Lake Co. Line 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
  UCD138534  Allium fimbriatum var. purdyi L. K. Mann 1958-5-3 s.n. Colusa about 0.8 mile toward Wilbur Springs from Junction of California Highway #16 and #20. 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
  UCD163228  Allium fimbriatum var. purdyi Craig D. Thomsen 2001-5-24 2511 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
  UCD57292  Allium fimbriatum var. purdyi Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3663 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. 328 Comment
  SEINET3884500  Allium fimbriatum var. purdyi Thomas Nelson, Jane P. Nelson 1978-4-30 3972 Colusa State Route 20 just east of Colusa-Lake county line.; 0 549 Comment
  SEINET194917  Allium purdyi A. A. Heller 1942-5-29 16484 Colusa 1/2 mile east of the Lake County Line. 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
  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
  HSC67097  Allium serra Teri Bartowski, Shane Feusier, Ruth Takaki, Carol Zimmerer 1980-4-19 47 Colusa Leesville Rd. from Leesville to Williams, 3.8 mi. E of Leesville Comment
  HSC72137  Allium serra J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9569 Colusa Bear Valley Rd., 2.1 mi. from its junction with Hwy. 20 366 Comment
  UCD57665  Allium serra Erica A. Smith; with Plant Biology 102 2007-4-29 3 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, just west of where road crosses Craig Creek. 313 Comment
  HSC47565  Allium serra J. P. Smith, J. O. Sawyer 1978-4-29 9793 Colusa Bear Valley Rd., 5.9 mi. from its junction with Hwy. 20 366 Comment
  UCD141822  Allium serra L. K. Mann; A. Saghir 1963-5-15 s.n. Colusa along road 3.2 miles past junction of Caliornia 16 and 20, toward Rumsey, SW part of county. Comment
  UCD141829  Allium serra M. Yamaguchi; D. Hughes, D. G. Hunt 1965-4-29 s.n. Colusa along road 3.2 miles past junction of California 16 and 20, toward Rumsey, SW part of county. Comment
  CHSC90778  Allophyllum divaricatum D. Isle 2002-4-18 182 Colusa Mendocino National Forest--North Coast Ranges. Upper Lake Watershed. S. of Bathhouse Trail Rd. 17N51, no. of Fouts Springs. 548 Comment
  CHSC36827  Allophyllum gilioides B. Castro 1982-3-27 3 Colusa On roadcut on n side of Hwy 20 at Salt Canyon, n side of Salt Ck, 11 mi wsw of Williams. 143 Comment
  HSC44459  Allophyllum gilioides R. York 1978-4-22 129 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 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
  CHSC84970  Amaranthus californicus Lowell Ahart 2003-10-23 10658 Colusa On the east strand 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
  JEPS120702  Amaranthus californicus Lowell Ahart 2013-10-1 19089 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
  UC727678  Amaranthus californicus Milo S. Baker 1946-9-5 11625 b Colusa 5 mi w Colusa (along hwy towards Williams) Comment
  CDA19687  Ambrosia confertiflora D. Brown 2001-10-17 PDR 024367 Colusa Northern California; Vicinity of Colusa 0 Comment
  CDA32033  Ambrosia psilostachya D. Isle, Rhonda Isle 2007-9-9 1624 Colusa Mendocino National Forest- North Coast Ranges Middle Fork Stony Creek Watershed; 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. 0 Comment
  JEPS110533  Ambrosia psilostachya Lowell Ahart 2006-10-31 13518 Colusa About 20 yards northeast of the bridge across Stony Creek, just north of Stonyford 347 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
  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
  POM134394  Ammannia robusta Roxana Stinchfield 1916-7-17 288 Colusa At Tule Levee, College City Comment
  SFV3062  Amsinckia intermedia D. West 1960-4-10 11 Colusa Southern end of Bear Valley, 5 miles northwest of junction of State Highways 16 and 20. 244 Comment
  UCD82372  Amsinckia intermedia Robin McMaster 1973-4-15 346 Colusa 0.5 mi towards Bartlett Springs from Bear Valley Road. Comment
  CHSC86519  Amsinckia lunaris B. Castro; Beth Hendrickson 2003-3-24 1396 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 323 Comment
  JEPS102235  Amsinckia lunaris L. P. Janeway 2001-4-18 7024 Colusa Vicinity of Grapevine Creek, Sites-Lodoga Road, and Scotties Spring. 274 Comment
  UCD63713  Amsinckia lunaris Craig D. Thomsen 2008-3-30 2722 Colusa BLM Payne Ranch. Southwest of intersection of Hwy 16 and Hwy 20, near ridgeline and headwaters of Eula Canyon drainage. 501 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
  UCD80821  Amsinckia lunaris Ellen Dean, G. Harrington; K. Mawdsley, C. Thomsen, G. Walden, E. McDermott 2009-3-18 5277 Colusa BLM Bear Creek (Payne) Ranch, lands to the SW of the jct of Hwys 20 and 16. SW-facing slope above Lynch Canyon on east side of canyon. 470 Comment
  CHSC60660  Amsinckia lycopsoides Vernon H. Oswald 1993-4-14 5267 Colusa Tour Route, Colusa National Wildlife Refuge, SW of Colusa. Along the edge of the levee road along the S leg of the tour route. 18 Comment
  POM287399  Amsinckia lycopsoides Lyman Benson 1935-3-27 6343 Colusa Williams. 61 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
  UCD56909  Amsinckia menziesii Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3512 Colusa BLM Payne Ranch. In Craig Canyon. Southwest of intersection of Hwy. 16 and Hwy. 20. 326 Comment
  UC1178293  Amsinckia tessellata var. gloriosa Ray and Chisaki 1952-3-29 K 125 Colusa Cache Creek Comment
  CHSC101640  Ancistrocarphus filagineus David W. Isle 2002-4-18 1658 Colusa Mendocino National Forest. N of Fouts Springs, N of Chlorinator Building and road to Bathhouse Trailhead. Edge of E-flowing ephemeral drainage. MDB and M. In chamise site burned in 8/8/01 Trough Fire and part of Helicopter Hydromulch Study Plot. 524 Comment
  CHSC112258  Ancistrocarphus filagineus Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18626 Colusa Inner North Coast Range. On the 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
  HSC48170  Ancistrocarphus filagineus Thomas W. Nelson, Jane P. Nelson 1978-4-29 3934 Colusa Along Bear Valley Rd., 2 mi. from the junction with State Route 20. 366 Comment
  JEPS120971  Ancistrocarphus filagineus Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18626 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
  JEPS16206  Ancistrocarphus filagineus Rimo Bacigalupi and Arthur Holmgren 1950-4-26 3182 Colusa just w of, (w of base of grade to Indian Valley (Bartlett Mt. Road)) Bear Valley; Inner North Coast Ranges, Indian Valley, Bear Valley Comment
  UC1111603  Ancistrocarphus filagineus Herbert L. Mason 1941-4-5 12406 Colusa 3 mi s Stonyford Comment
  UCD166309  Ancistrocarphus filagineus Jack Major 1962-4-28 805 Colusa At entrance to Bear Valley. (Exact location unknown. Coordinates estimated by label maker.) 381 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
  CHSC86874  Androsace elongata subsp. acuta B. Castro 2003-4-1 1409 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek, on low N-facing cutbank of dirt road which contours along hillside. 280 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
  CHSC32214  Antennaria geyeri James Jokerst 1980-8-6 1060 Colusa North Coast Ranges. Near Snow Mountain (West). Comment
  UCD163652  Antirrhinum cornutum Craig Thomsen 1998-6-10 1950 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  CHSC110858  Antirrhinum subcordatum David Isle; Rhonda Isle 2013-5-19 2039 Colusa 0.1 mi E of Maxwell Grade Summit; burned SW asp. upper drainage slope N of Sites Lodoga Road. July 2012 Sites Fire Area GPS (CONUS) 10S 0546887e 4356402N. Comment
  CHSC84191  Antirrhinum vexillo-calyculatum subsp. intermedium Lowell Ahart 2003-7-14 10388 Colusa By a wash, on the east side of Bear Valley Road, about 3 miles northwest of Highway 20. 381 Comment
  RSA161328  Antirrhinum vexillocalyculatum subsp. breweri Peter H. Raven, Richard Snow 1959-9-11 14420 Colusa Openings in forest of Pinus ponderosa, Dark Hollow Creek. 1860 Comment
  UCD123477  Antirrhinum virga A. M. Shapiro 1994-6-13 s.n. Colusa just north of Goat Mountain Rd. on Sullivan Ridge. 914 Comment
  CHSC115752  Antirrhinum virga David Isle 2015-6-20 2157 Colusa 10S -0533568E, 4357508N). North Coast Ranges: 4 mi W of Stonyford; SE of curve at culvert crossing just E of old dumpsite rd jct; uphill 200' S of 18N01 in 2012 Mill Fire area chaparral. N aspect, chamise chaparral; 50-80' above Quercus berberidifolia and #156 RIMA GPS. 439 Comment
  RSA0105546  Antirrhinum virga David Isle 2015-6-20 2157 Colusa North Coast Ranges: ~4 mi W of Stonyford; SE of curve at culvert crossing just E of old dumpsite rd jct; uphill ~200' S of 18N01. 439 Comment
  CHSC91007  Aphanes occidentalis D. Isle 2002-4-18 299 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. N of Chlorinator bldg., Rd. to Bath House Trail. 548 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
  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
  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
  IRVC29688  Apocynum androsaemifolium Mark A. Elvin, Mark S. Brunell, David Isle 2006-8-3 5030 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
  UCD63730  Arceuthobium campylopodum Craig D. Thomsen 2008-5-23 2739 Colusa BLM Payne Ranch. Southwest of intersection of Hwy 16 and Hwy 20. 0.75 mile south of Hwy 20 (south of Destanella Flat) and 2.5 miles west of Hwy 16. 520 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
  UCD163030  Arctostaphylos canescens D. O. Burge 2015-7-11 1754 Colusa Summit Springs area. 1480 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
  HSC96816  Arctostaphylos canescens subsp. canescens J. Carey, A. Hong, J. Leffingwell 1995-4-1 24 Colusa Walker Ridge Rd., 4.8 mi. N of its junction with Indian Valley Access Rd. 976 Comment
  CDA34806  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, on slopes above Zimory Canyon to the west, Trout Creek to the east, and adjacent slopes on both sides of the road. Comment
  UCD163029  Arctostaphylos manzanita D. O. Burge 2015-7-11 1753 Colusa Summit Springs area. 1480 Comment
  SEINET11989688  Arctostaphylos manzanita R. A. DeMartile 1982-1 s.n. Colusa between Ladoga & Goat Mt. lookout 792 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
  CHSC92603  Arctostaphylos manzanita subsp. elegans D. Isle 2005-7-14 1153 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. In saddle of Board Camp Ridge on 17N10, SE of the Homesites about 1 mile. SE of Boardcamp gate at the junction with OHV Trail 06 and road 17N10. 1633 Comment
  JEPS75765  Arctostaphylos manzanita subsp. elegans L. R. Heckard and R. Bacigalupi 1976-9-6 4454 Colusa trail just above Summit Springs (Colusa-Lake Co. line); Snow Mt. 1584 Comment
  CAS-BOT-BC24376  Arctostaphylos manzanita subsp. manzanita Walter Knight; Irja Knight 1964-4-11 814 Colusa Between Lewisville and Ladoga. Comment
  CAS-BOT-BC24380  Arctostaphylos manzanita subsp. manzanita Roxana S. Ferris 1926-4-23 6592 Colusa Near Stonyford. Comment
  CHSC86877  Arctostaphylos manzanita subsp. manzanita B. Castro 2003-3-28 1407 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 170 Comment
  SD247411  Arctostaphylos manzanita subsp. manzanita Ann Howald 2003-3-11 2278 Colusa Inner North Coast Ranges: Indian Valley, east side of East Park Reservoir, peninsula ca. 2.2 miles north of Lodoga (Lodoga 7.5'Q) 365 Comment
  UCR206665  Arctostaphylos manzanita subsp. manzanita George K. Helmkamp, E. A. Helmkamp 2009-3-17 14395 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
  RSA0010486  Arctostaphylos manzanita subsp. roofii Richard R. Halse 2014-3-25 9034 Colusa Along the Bear Valley Road ca.1.8 miles west northwest of its junction with State Hwy.20. 378 Comment
  SEINET7258424  Arctostaphylos manzanita subsp. roofii R. R. Halse 2014-3-25 9034 Colusa Along the Bear Valley Road ca. 1.8 mi WNW of its junction with State Hwy. 20. 378 Comment
  CHSC92610  Arctostaphylos manzanita subsp. wieslanderi D. Isle 2005-7-14 1151 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. In saddle of Boardcamp Ridge on 17N10, SE of the Homesites about 1 mile. SE of Boardcamp gate at the junction with OHV Trail 06 and road 17N10. 1633 Comment
  UCD15253  Arctostaphylos viscida R. Robichaux 1975-4-20 36 Colusa six miles northwest of Highway 20 on the north side of Walker Ridge road. Comment
  UCD163861  Arctostaphylos viscida Craig D. Thomsen 2001-5-31 2543 Colusa Bear Creek Canyon south of Sulphur Creek confluence. About 3 miles north of Hwy 20. 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
  CDA38841  Arctostaphylos viscida G. D. Barbe 1964-3-29 761 Colusa Three miles west of Bear Valley Road on Bartlett Springs Road at Lake/Colusa county line; west of Leesville. Comment
  JEPS87754  Arctostaphylos viscida subsp. pulchella Vernon H. Oswald and Lowell Ahart 1994-3-23 6011 Colusa s side Little Stony Creek (in section on e side of Frenzel Creek, s of Stonyford); Frenzel Creek Research Natural Area 518 Comment
  JEPS87758  Arctostaphylos viscida subsp. pulchella Vernon H. Oswald and Lowell Ahart 1994-3-23 6011 Colusa s side Little Stony Creek (in section on e side of Frenzel Creek, s of Stonyford); Frenzel Creek Research Natural Area 518 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
  UCSC010367  Arctostaphylos viscida subsp. pulchella Dylan M. Neubauer, Tim Forsell 2016-3-30 591 Colusa (NCoRI) Walker Ridge, Bartlett Springs Road, 1.22 air-miles sse Baldy Mountain 899 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
  POM367485  Arctostaphylos viscida subsp. viscida Phyllis Krieg 1979-4-14 s.n. Colusa [Unspecified] 1067 Comment
  JEPS80132  Arenaria congesta var. congesta L. R. Heckard with J. Hickman 1980-7-1 5291 Colusa Trail from Summit Springs Frog Pond ((ca. 10 mi w of Stonyford)); Snow Mt. 1737 Comment
  CDA11924  Argemone munita G. F. Hrusa 1989-5-7 6077 Colusa North Coast Biodiversity Arena; Cedar Mtn. Rd. along Little Stony Creek, approx. 4 miles above intersection with Stonyford-Lodoga Rd. Comment
  UCD82434  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
  CAS-BOT-BC401742  Argemone munita subsp. rotundata L. Constance 1939-5-14 2490 Colusa 1 mile east of Mill Creek Ranger Station, Inner North Coast Ranges 548 Comment
  CAS-BOT-BC401745  Argemone munita subsp. rotundata Roxana S. Ferris 1926-4-23 6455 Colusa Field at Stonyford 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
  JEPS16204  Argemone rotundata Rimo Bacigalupi, Arthur Holmgren 1950-4-26 3178 Colusa just w of base of the grade to Indian Valley (Bartlett Mountain Road), just w of Bear Valley, Inner North Coast Ranges, Bear Valley; Inner North Coast Ranges Comment
  UC1051551  Argemone rotundata Helen K. Sharsmith 1953-6-21 4308 Colusa slopes of Little Stoney Creek 1 mi within boundary of Mendocino National Forest (Inner North Coast Ranges); Inner North Coast Ranges 670 Comment
  UCD56862  Aristida ternipes var. gentilis Beecher Crampton 1958-5-19 4789 Colusa 10.7 miles southeast of Leesville. Comment
  UC650323  Aristida ternipes var. hamulosa Paul Pattengale 1940-12-17 Colusa approximately 12 mi w Williams Comment
  CAS-BOT-BC400399  Aristolochia californica Roxana S. Ferris 1926-4-22 6308 Colusa Sycamore Slough near Sycamore Comment
  CDA15478  Arnica discoidea G. F. Hrusa, WTD 1998-6-19 14615 Colusa North Coast Ranges; USFS Pacific Ridge Rd. (M5), +- 4-5 km. NW of inters. w/Colusa Co. Goat Mtn. Rd. Comment
  JEPS75860  Arnica longifolia L. R. Heckard 1974-9-10 3889 Colusa Dark Hollow Creek Snow Mt., Dark Hollow Creek 2011 Comment
  CHSC100273  Arrhenatherum elatius David Isle 1990-6-6 1519 Colusa Mendocino National Forest - North Coast Ranges. Middle Fork Stony Creek Watershed. Lower Letts Valley in moist meadow. MDMB. 1243 Comment
  CHSC61398  Artemisia douglasiana Vernon H. Oswald 1993-8-16 5809 Colusa Sacramento National Wildlife Refuge. Refuge located ca. 7 mi S of Willows, NE corner of Tract 41. 25 Comment
  CHSC94281  Artemisia douglasiana Lowell Ahart 2006-8-9 13100 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  UCD81224  Artemisia douglasiana Ellen Dean; K. Mawdsley, B. Rice, G. Harrington, and J. Alderson 2009-5-6 5561 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. 443 Comment
  SFV10912  Asclepias cordifolia M. L. Vincent 1968-6-6 791 Colusa 1.2 miles west from Stony Ford. 11 mile sign on trip down from Goat Mountain. 375 Comment
  UC1299578  Asclepias cordifolia Freed W. Hoffman 1947-6-19 1671 Colusa Cooks Springs North Coast Ranges Comment
  UC971989  Asclepias cordifolia Herbert L. Mason 1952-6-19 14302 Colusa Black Diamond Ridge Mendocino National Forest 822 Comment
  RSA537477  Asclepias cordifolia Barbara Ertter 1989-7-1 8603 Colusa Road to Goat Mt Lookout 2.2 mi S of Rt M-10 (Bear Creek, ca 12 airmiles WSW of Stonyford 1500 Comment
  CHSC60872  Asclepias fascicularis Vernon H. Oswald 1993-6-23 5573 Colusa Sacramento National Wildlife Refuge. Refuge located ca. 7 mi S of Willows, along the NE edge of Tract 41. 22 Comment
  JEPS15567  Asclepias fascicularis G. Thomas Robbins with L. R. Heckard 1956-7-25 3714 Colusa above Dark Hollow Creek (tributary of Middle Fork Stony Creek) (s flank of Snow Mt. East, at lower edge of cirque between Snow Mt. East and Snow Mt. West); Snow Mt. East 1981 Comment
  JEPS93867  Asclepias fascicularis Vernon H. Oswald and Lowell Ahart 1998-7-15 9266 Colusa Bartlett Springs Road 1.6 mi w of Bear Valley Road; Bartlett Springs Road 487 Comment
  JEPS80258  Asclepias fascicularis L. R. Heckard and J. Hickman 1980-9-15 5437 Colusa Summit Springs, n of road Snow Mt., Lake-Colusa County Boundary 1524 Comment
  UC424842  Asclepias solanoana Milo S. Baker 1929-6-30 3472 b Colusa Snow Mt. Trail to Summit Springs (at Cedar Creek); Snow Mt., Cedar Creek Comment
  CHSC75583  Asclepias speciosa Vernon H. Oswald; Lowell Ahart 1999-6-22 9774 Colusa Fouts Springs Rd. (M10) 9.9 mi west of Stonyford-Elk Creek Rd. 624 Comment
  JEPS82548  Asclepias speciosa L. R. Heckard 1983-7-27 6111 Colusa slopes around Summit Springs (s flank of Snow Mt.); Snow Mt. Comment
  JEPS95651  Asclepias speciosa Vernon H. Oswald and L. Ahart 1999-6-18 9774 Colusa Fouts Springs Rd. (M10) 9.9 mi west of Stonyford-Elk Creek Rd.: T17N R7W Sect. 7, 2050 ft, chaparral, serpentine substrate. From a colony growing along the edge of a roadside seep. 624 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
  RSA724830  Aster subulatus var. ligulatus L. Ahart 2006-9-26 13343 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 5.5 miles east of Maxwell. 24 Comment
  RSA140825  Aster subulatus var. parviflorus John H. Thomas 1960-8-30 8864 Colusa About 5 miles northwest of College City along road to Sycamore. Comment
  UCD58179  Astragalus clevelandii Gordon Harrington 2007-5-31 69 Colusa BLM Payne Ranch. Lands to the SW of the intersection of Hwy 16 and Hwy 20. Along Thompson Creek, approximately 3/4 mile downstream from Road Kill Cafe. 357 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
  SEINET7096743  Astragalus gambelianus A. G. Vestal 1955-4-5 3673 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
  HSC48165  Astragalus rattanii var. jepsonianus Thomas W. Nelson, Jane P. Nelson 1978-4-29 3929 Colusa Along Bear Valley Rd. 2 mi. from junction with State Route 20 366 Comment
  JEPS21844  Astragalus rattanii var. jepsonianus John R. Swanson 1958-4-26 280 Colusa along roadside on Bear Valley - Lodoga road 6.6 mi s Barlett Springs junction; Bear Valley - Lodoga Road 365 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
  UCD57293  Astragalus rattanii var. jepsonianus Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3664 Colusa BLM Payne Ranch. Near origin of Craig Canyon. West of Hwy. 16, ca. 2 road miles south of junction of Hwy. 20 and Hwy. 16. 359 Comment
  UCR212345  Astragalus rattanii var. jepsonianus Craig D. Thomsen 2000-4-12 2144 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
  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
  HSC89736  Astragalus tener Robin Bencie, James Jones, Rich Dwerlkotte 1989-4-15 10 Colusa 1.2 mi. S of Brim Rd. on Bear Valley Rd. 396 Comment
  NY5728  Astragalus tener var. ferrisiae R. S. Ferris 1926-4-21 6281 Colusa 3 Mi W of Colusa. Comment
  CHSC87153  Athysanus pusillus Jenny Marr; Beth Hendrickson, Jean Witzman, Natalie Wight 1999-2-25 Colusa Vicinity of Antelope Valley, Antelope Creek, and Sites. 152 Comment
  UC2029560  Athysanus pusillus Richard R. Halse 2013-3-27 8763 Colusa Along State Highway 20 just east of the Colusa/Lake County Line, ca. 14.6 miles east of the junction of State Highway 20 and 53 Comment
  UCD114233  Athysanus pusillus Beecher Crampton 1958-4-21 4725 Colusa Colusa-Yolo County line, along State Hwy. 16, junction Bear and Cache Creeks, 7.4 miles northwest of Rumsey. Comment
  CAS-BOT-BC17403  Athysanus pusillus Volney Rattan 1884-1-1 s.n. Colusa Unspecified. Comment
  UCR225263  Atriplex Craig D. Thomsen 2008-4-27 s.n. Colusa BLM Payne Ranch, lands to the southwest of the intersection of Hwys 20 and 16. Southwest of Cowboy Camp on the west side of Bear Creek 366 Comment
  CDA22995  Atriplex argentea Mike Pitcairn 2008-8-2 PDR# 1440792 Colusa Colusa Wildlife Refuge, 1.5 miles S of Hwy 20 0 Comment
  UCR205145  Atriplex argentea George K. Helmkamp, E. A. Helmkamp 2008-10-14 14250 Colusa Sacramento Valley, along CA-20, 0.2 mile east of the Sutter County line 9 Comment
  CHSC94745  Atriplex argentea var. mohavensis Lowell Ahart 2006-9-26 13346 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
  CHSC61030  Atriplex coronata var. coronata Vernon H. Oswald; Mike Wolder, Joe Silveira. 1993-7-26 5701 Colusa Colusa National Wildlife Refuge. Tract 18 on the S side of the refuge, ca. 1 mi W of Ohm Rd., ca. 1 mi N of Ware Rd., ca. 5 mi S of Colusa. 15 Comment
  CHSC107933  Atriplex depressa B. Castro; L. Janeway 2011-7-9 1894 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; and widely scattered in very small patches along NW edges of marsh.. 49 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
  JEPS90590  Atriplex depressa Dean W. Taylor 1993-8-31 14069 Colusa dry vernal pool ca 200 mi e North Fork Logan Creek (Logandale 7 1/2' USGS quadrangle); Sacramento Valley, Sacramento National Wildlife Refuge 24 Comment
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Jun 18 2015
  UCD97410  Atriplex fruticulosa P. B. Kennedy 30-31 May 1922 s.n. Colusa Colusa County. Comment
  UCD163857  Atriplex joaquinana Craig D. Thomsen 2001-4-26 2484 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  CHSC108070  Atriplex micrantha B. Castro; Dave Boegner 2011-9-1 1911 Colusa Sacramento Valley. Larkins Childrens Rancho. 10 air mi NW of Colusa, 3 mi W of the Sacramento River and 600 ft N of the northern boundary of Delevan NWR. Near where Hunters and Logan Creeks empty into the Colusa Basin Drain. Common around outer western edges of managed +- saline wetland of Gunnersfeld Ranch duck hunting club, among patches of tules and cattails. On and just below berms. 17 Comment
  JEPS108755  Atriplex rosea Lowell Ahart 2006-9-26 13346 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
  JEPS90603  Atriplex rosea Dean W. Taylor 1989-8-4 10422 Colusa Colusa National Wildlife Refuge Great Central Valley (along Ohm Road) 39 Comment
  UC217003  Atriplex serenana var. serenana H. M. Hall 1920-7-12 11011 Colusa 5 mi e Maxwell; e of Maxwell Comment
  CHSC94733  Atriplex triangularis 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
  HSC72146  Avena barbata J. P. Smith, Jane P. Nelson, Thomas W. Nelson 1978-4-2 9559 Colusa Bear Valley Rd., 2.1 mi. from its junction with Hwy. 20 366 Comment
  JEPS81281  Avena barbata L. R. Heckard and J. C. Hickman 1982-7-5 5892 Colusa Summit Springs Snow Mt. (s side of mt) 457 Comment
  UCD65636  Avena barbata Craig D. Thomsen 2000-4-12 2148 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
  CHSC83697  Avena fatua L. P. Janeway 2002-4-24 7523 Colusa Sacramento Valley/Inner North Coast Ranges border. Vicinity of Logan Ridge, Stone Corral Creek, and Funks Creek. 103 Comment
  JEPS113773  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
  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
  HSC41860  Balsamorhiza macrolepis K. Irwin 1977-4-24 299 Colusa Along Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  CAS-BOT-BC100067  Balsamorhiza 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 jcn Bartlett Springs Rd and 716 Comment
  UCD82586  Barbarea vulgaris Craig D. Thomsen; J. Wiegand, S. Harrison, G. Harrington, A. Fulks 2008-4-22 2731 Colusa Walker Ridge. Eaton Springs, 4 mi N of Hwy 20, ca. 1 mi E of Walker Ridge Rd. 609 Comment
  UC1613495  Berberis aquifolium var. dictyota Charles M. Belshaw 1937-4-25 2838 Colusa vicinity of Cook's Spring (Inner North Coast Range, Devil's Ridge); Inner North Coast Range, Devil's Ridge Comment
  JEPS80794  Berberis aquifolium var. repens L. R. Heckard and J. C. Hickman 1981-7-30 5764 Colusa se Snow Mt (along Trout Creek) 1539 Comment
  CHSC84963  Bergia texana Lowell Ahart 2003-10-23 10670 Colusa On the east strand 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
  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
  CHSC42573  Berula erecta Vernon Oswald 1986-6-30 2171 Colusa Fouts Spring Rd. (M10) at Candy Bucket Spring, 6.0 mi w of Rd. 306. 0.4 mi e of jct. John Smith Rd. (M5). 609 Comment
  CAS-BOT-BC100260  Blennosperma nanum var. nanum Roxana S. Ferris 1917-4-12 498 Colusa 4 miles East of Williams Comment
  SFV1404  Boechera breweri R. C. Bacigalupi 1950-4-16 3106 Colusa North Coast Ranges Ridge above Red Bridge Camp and the confluence of the North and Middle forks of Stony Creek. Near Colusa-Glenn County line. 579 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
  CHSC36976  Boechera repanda J. D. Jokerst 1982-8-11 1647 Colusa North Coast Ranges. Lake-Glenn-Colusa tricounty jct. On the northeast face of the West Peak of Snow Mt. ca. 300 meters ne of the summit. 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
  JEPS73484  Boechera repanda L. R. Heckard 1972-7-9 3095 Colusa se slope Snow Mt. East Peak; Snow Mt. 2072 Comment
  CHSC117121  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
  JEPS127623  Boehmeria cylindrica B. Castro with Tom Boullion 2009-8-24 1800 G-1 Colusa Ca 8 ai 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. 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
  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
  CHSC107126  Bolboschoenus glaucus L. P. Janeway; B. Castro 2011-5-19 10286 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 1.8 km southeast of Funks Reservoir and 0.3 km northeast of Tehama-Colusa Canal. East edge of the marsh. 49 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-BC28201  Bolboschoenus glaucus Maxine Wilkes 1929-8-1 s.n. Colusa Unspecified Comment
  CAS-BOT-BC28250  Bolboschoenus glaucus V. C. Bryant 1929-8-1 s.n. Colusa Colusa Ricefields. Comment
  UCD18527  Bolboschoenus glaucus June McCaskill; with Mr. Harvey and Loren Davis 1954-8-9 361 Colusa ca. 2 mi. east of Princeton and 400 yds. south of Glenn County line. Comment
  CAS-BOT-BC31370  Bolboschoenus maritimus Roxana S. Ferris 1926-4-22 6283 Colusa Roadside ditch 3 miles west of Colusa. Comment
  CAS-BOT-BC322142  Bolboschoenus maritimus Peter Rubtzoff 1965-9-14 5651 Colusa 4.5 miles from Hwy. 20 on the road to Wilbur Springs. Comment
  UCD163914  Bolboschoenus maritimus subsp. paludosus Sara Martin 2016-4-9 6 Colusa BLM Bear Creek Ranch (Previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. Destinella Flat, just south Hwy 20. 550 Comment
  JEPS80460  Botrychium crenulatum Alice Q. Howard 1972-7-10 2 Colusa mossy spring area crossing trail from Fouts Camp to Box Springs (highest of 2 such areas on n side of ridge separating Trout and Paradise Creeks); Snow Mt. 1676 Comment
  UCR206291  Brassica juncea George K. Helmkamp, E. A. Helmkamp 2009-5-20 14737 Colusa Central Inner Coast Ranges, along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 320 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
  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
  SEINET198872  Brodiaea capitata J. A. Riegel 1954-3-12 1 Colusa Above Cache Creek 6.8 miles northwest of Rumsey. Comment
  SEINET7075565  Brodiaea elegans A. G. Vestal 1955-4-5 3684 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
  UCD72459  Brodiaea elegans subsp. elegans Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3793 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
  UCD82131  Brodiaea elegans subsp. elegans Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5657 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
  CAS-BOT-BC144360  Bromus William Bancroft 1958-7-5 s.n. Colusa Summit of Snow Mountain, Colusa-Lake County line. Comment
  JEPS110141  Bromus arenarius Lowell 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
  UCD37188  Bromus arenarius Beecher Crampton 1958-5-19 4793 Colusa Colusa County, 10.1 miles southeast of Leesville, east of foothills known as Three Sisters. Comment
  UCD81887  Bromus carinatus Ellen Dean; Bear Creek Ranch Grazing Committee 2009-6-19 5771 Colusa BLM Bear Creek (formerly Payne) Ranch. Lands to the SW of the junction of Hwys 16 and 20. Southern portion of Lynch Canyon, just S of building known as Roadkill Cafe. Along Thompson Creek, E of road crossing. 423 Comment
  UCD59156  Bromus carinatus var. marginatus Beecher Crampton 1958-5-19 4800 Colusa 5.8 miles south of Lodoga. Comment
  UCD66931  Bromus caroli-henrici Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5080 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
  CAS-BOT-BC155496  Bromus hordeaceus Roxana S. Ferris 1917-4-12 527 Colusa 4 miles east of Williams. Comment
  UCD58684  Bromus hordeaceus A. A. Beetle 1942-5-21 3272 Colusa 12 miles north of Williams. Comment
  UCD63103  Bromus japonicus Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4934 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
  JEPS80797  Bromus laevipes L. R. Heckard and J. C. Hickman 1981-7-30 5767 Colusa se side of Snow Mountain, along Trout Creek Trout Creek; Snow Mountain, Trout Creek 1554 Comment
  CHSC112028  Bromus laevipes David Isle; Doug Johnson 1988-5-11 2089 Colusa Mendocino National Forest. Little Stony Road (Goat Mtn Rd). 426 Comment
  UCD81893  Bromus madritensis Ellen Dean; Bear Creek Ranch Grazing Committee 2009-6-19 5777 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
  CHSC86613  Bromus madritensis subsp. rubens Jenny Marr; Heidi West, Joyce Lacey, Caroline Warren, N. Wight 1998-4-14 Colusa Vicinity of Grapevine Creek, Antelope Valley, and Sites-Lodoga Road. 121 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
  UC1543159  Bromus madritensis subsp. rubens Charlotte G. Nast 1936-4-17 135 Colusa Williams to Lake County Road Lake County Road Comment
  UCD57058  Bromus madritensis subsp. rubens Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3645 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
  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
  UCD59764  Bromus tectorum Beecher Crampton 1958-5-19 4808 Colusa West of Lodoga. Comment
  UCR212328  Bromus tectorum Craig D. Thomsen 2000-4-12 2133 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
  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
  UCD129653  Cacaliopsis nardosmia J. M. Tucker 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. 1447 Comment
  CHSC112207  Calandrinia breweri Lowell Ahart 2013-5-1 18673 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
  JEPS120964  Calandrinia breweri Lowell Ahart 2013-5-1 18659 Colusa 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
  UC72578  Calandrinia ciliata Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  UCD163689  Calandrinia ciliata Craig Thomsen 1999-4-15 1991 Colusa Bear Valley. About 5 miles north of Hwy 20, west of Bear Valley Rd. Comment
  UCD57308  Calandrinia ciliata Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3679 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
  UCD100193  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 site. 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
  UCD103570  California macrophylla Craig Thomsen 2011-3-28 s.n. Colusa BLM Bear Creek (formerly Payne) Ranch. W of intersection of Hwys 16 and 20; E side of 'Serpentine Creek.' Drainage runs north from Bear Creek Ranch flowing under pull out along Hwy 20. 335 Comment
  NY465060  Callitriche marginata A. A. Heller 1902-5-2 5440 Colusa Princeton Comment
  UC1049549  Calochortus amabilis Rimo Bacigalupi 1950-4-16 3110 Colusa e outskirts Stony Ford (town) (vicinity of Colusa-Glenn County line); Inner North Coast Ranges Comment
  UC843630  Calochortus amabilis Lewis S. Rose 1936-4-27 36196 Colusa 22 mi sw Williams 396 Comment
  UCR198059  Calochortus amabilis E. Jacqueline Garcia 1986-4-13 s.n. Colusa Bear Valley, 2.6 mi west of the junction of Bear Valley Road and Bartlett Springs Road, on Bartlett Springs Road 664 Comment
  CHSC110824  Calochortus amabilis David Isle; Rhonda Isle 1989-4-29 2002 Colusa Stony Creek Watershed. Just N of 18N01 (Fouts Springs Rd.) 2 miles W of Jct. w/Co. Rd. 306. (Just E of entrance to Brother Moore's Home). Just W of BM 1,255'. 382 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
  CHSC85971  Calochortus luteus Jenny Marr; Heidi West, Joyce Lacey-Rickert, Caroline Warren 1998-5-8 Colusa Vicinity of Sites and Antelope Valley. 152 Comment
  CHSC89879  Calochortus luteus B. Castro; L. Janeway 2001-5-10 1248 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 on steep E-facing slope 396 Comment
  JEPS61681  Calochortus luteus W. L. Jepson 1920-5-23 8969 Colusa 2-3 mi sw Leewville (at foot of Bartlett grade, w side of Bear Valley); Bear Valley, Bartlett Grade 426 Comment
  SJSU9982  Calochortus luteus E. O. Haas 1956-5-12 69 Colusa Salt Creek c. 10 mi SW of Arbuckle 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
  CDA15475  Calochortus splendens G. F. Hrusa, WTD 1998-6-19 14612 Colusa North Coast Ranges; Above upper Little Stony Creek. Goat Mtn. Rd. ~ 1.5 km. W of of campground. Comment
  CHSC2243  Calochortus splendens D. Smith 1935-5-12 Colusa Stonyford Hills. Comment
  CHSC79620  Calochortus splendens G. F. Hrusa 1998-6-19 14612 Colusa the North Coast Ranges. Above upper Little Stony Creek. Goat Mtn. Rd. ~ 1.5 km. W of campground. UTM: 10 S, 05356 N, 43478 E. 485 Comment
  CHSC80106  Calochortus splendens L. P. Janeway; Joyce Lacey-Rickert 2000-6-1 6779 Colusa Vicinity of Grapevine Creek, Scotties Canyon, and Rena Canyon. 243 Comment
  JEPS120967  Calochortus splendens Lowell Ahart 2013-5-1 18683 Colusa On the N of the wash and 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
  UCD139570  Calochortus splendens K. Esau 1934-5-6 s.n. Colusa West of Williams, Ukiah-Tahoe Highway. Comment
  CAS-BOT-BC483484  Calochortus splendens Volney Rattan 1884-6-1 s.n. Colusa Above Fouts Springs, Coast Mts. north of San Francisco Bay Comment
  UC1187346  Calochortus splendens Herbert L. Mason 1961-5-21 15075 Colusa Mouth of Bear Valley Comment
  HSC45509  Calochortus uniflorus M. Alcasas 1978-4-23 59 Colusa Bear Valley Rd., 4.7 mi. from Bartlett Springs Rd. 457 Comment
  JEPS39672  Calochortus uniflorus Rimo Bacigalupi, T. Crovello and L. Heckard 1965-4-26 9045 Colusa 4.0 mi s point where road takes off w to Bartlett Springs; Bear Valley Comment
  RSA296716  Calochortus uniflorus Thomas Wood 1979-4-14 110 Colusa Bear Valley Road, 13 miles north of Hwy 20; Wilbur Springs Quad. 396 Comment
  UCD82499  Calochortus uniflorus Craig Thomsen; G. Harrington 2009-5-12 2858 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  SEINET3885343  Calochortus uniflorus Michelle Steven 1979-4-14 33 Colusa Wilbur Springs Quadrangle. Bear Valley Road, 13 miles north of State Route 20.; 0 396 Comment
  HSC65993  Calochortus vestae D. Boyd, M. Eichelberger, Tim Messick, Tom Ranker 1980-4-20 46 Colusa Leesville Rd. from Leesville to Williams, 3.8 mi. E of Leesville. Comment
  HSC97061  Calochortus vestae J. Carey, A. Hong, J. Leffingwell 1995-5-7 88 Colusa 2.25 mi. SE on Leesville-Williams Rd. from its junction with Bear Valley Rd. 396 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
  UC1971752  Calycadenia micrantha R. L. Carr 1994-9-23 2656 Colusa Wilson Camp, SE of Stoneyford, near the Colusa/Lake county line, ca. 3 air mi SE of Goat Mountain 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
  CAS-BOT-BC270758  Calycadenia pauciflora K. C. 1884-7-1 s.n. Colusa Mountain House Comment
  UC1299279  Calycadenia pauciflora Freed W. Hoffman 1947-6-20 1619 Colusa road from Stonyford to Fouts Springs Paskenta; North Coast Ranges 502 Comment
  UCD61447  Calycadenia pauciflora Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3892 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 1500 ft NW of parking lot. 368 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-BC270745  Calycadenia pauciflora Gerald D. Carr 1972-7-29 721 Colusa 3.1 miles S of Bartlett Springs Road on Walker Ridge Road, Buck Flat 868 Comment
  CAS-BOT-BC270747  Calycadenia pauciflora Gerald D. Carr 1971-7-29 606 Colusa On road to Trout Creek Trail, 0.5 mile NW of driveway to Fout Springs Boy's Ranch 502 Comment
  CAS-BOT-BC270750  Calycadenia pauciflora Gerald D. Carr 1971-7-29 608 Colusa 1 mile S of Stoneyford on road to Lodoga 365 Comment
  CAS-BOT-BC270753  Calycadenia pauciflora Gerald D. Carr 1971-9-14 651 Colusa 2.0 miles SW of Leesville on road to Bartlett Spring Comment
  CAS-BOT-BC270754  Calycadenia pauciflora Gerald D. Carr 1971-9-14 652 Colusa 3.6 miles SW of Leesville on Bartlett Springs Road 518 Comment
  RSA255514  Calycadenia pauciflora Gerald D. Carr 1971-9-15 658 Colusa 6 miles north of Yolo County Line on Hwy. 16 Comment
  RSA255608  Calycadenia pauciflora Gerald D. Carr 1971-7-29 605 Colusa 1.7 miles west of Lodoga on road to Stoneyford 412 Comment
  RSA255612  Calycadenia pauciflora Gerald D. Carr 1971-7-29 606 Colusa On road to Trout Creek Trail, 0.5 miles NW of driveway to Fout Spr. Boy's Ranch 503 Comment
  RSA788191  Calycadenia pauciflora R. L. Carr 1978-8-20 2156 Colusa Bear Valley Rd, 0.1 mi N of jct with Brim Rd (to Bartlet Springs), ca. 2 mi SW of Leesville, (=GDC 651). 451 Comment
  UC1876261  Calycadenia pauciflora Gerald D. Carr 1971-7-29 606 Colusa On road to Trout Cr. Trail, 0.5 mi NW of driveway to Fout Spr. Boys Ranch 502 Comment
  UCD129891  Calycadenia pauciflora Gerald D. Carr 1971-9-14 651 Colusa 2.0 miles southwest o Leesville on road to Bartlett Springs. Comment
  HSC86928  Calycanthus occidentalis Anthony J. Desch, Bryon Cariss 1988-4-16 34 Colusa 2 mi. W on Brim Rd. from corner of Brim Rd. and Bear Valley Rd. 518 Comment
  UCD63125  Calycanthus occidentalis Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4955 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. 436 Comment
  UCR228284  Calycanthus occidentalis Ellen Dean, Gordon Harrington, Craig D. Thomsen, S. Harrison 2008-5-18 4955 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 20 437 Comment
  UCD68099  Calyptridium monospermum Kathleen A. Robson 1981-5-23 37 Colusa From Stonyford, take Fouts Spring Road 12 miles West, past Fouts Springs to Letts Lake, Mendocino National Forest. 1219 Comment
  HSC72507  Calyptridium quadripetalum Thomas W. Nelson, Jane P. Nelson 1980-6-24 5880 Colusa Along road to Snow Mtn. trail head at Summit Springs 1585 Comment
  JEPS81077  Calyptridium quadripetalum Thomas W. Nelson and Jane P. Nelson 1980-6-24 5880 Colusa along trail to Snow Mountain trail head at Summit Springs, Six Rivers National Forest Summit Springs (Lake Pillsbury Quadrangle); Six Rivers National Forest, Snow Mountain trail 1584 Comment
  CDA39872  Calystegia collina T. C. Fuller 1958-5-27 3670 Colusa South of Highway 20, 1 mile west of junction with Highway 16. 0 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
  RSA0059895  Calystegia collina subsp. collina Gloria R. Campbell 1948-6-18 653 Colusa 2 miles west of junction of Highways 16 and 20. Comment
  RSA394936  Calystegia collina subsp. collina Eugene Memmler 1969-5-8 106 Colusa Hwy 20, Between Williams and Clear Lake. 152 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
  UCD66710  Calystegia collina subsp. oxyphylla Craig D. Thomsen 2001-5-24 2533 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
  HSC44461  Camissonia contorta R. York 1978-4-22 134 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
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Jul 20 2020
  UC71985  Camissonia contorta Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  CHSC70985  Camissoniopsis hirtella Vernon Oswald; Lowell Ahart 1998-5-7 9004 Colusa Bartlett Springs Rd. 2.1 mi west of Bear Valley Rd., 0.8 mi east of Sawtelle Valley and Grapevine Flat roads. 524 Comment
  UCD37191  Camissoniopsis hirtella Beecher Crampton 1958-5-19 4807 Colusa 4-8 miles south of Lodoga, Little Stony Creek Canyon. Comment
  JEPS121118  Campanula griffinii Lowell Ahart 2013-5-1 18690 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
  UCD164043  Cardamine hirsuta Richard Philbrook 2016-4-9 1 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. 312 Comment
  UCD64043  Cardamine oligosperma Craig D. Thomsen 2000-3-8 2033 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
  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
  CDA6843  Carduus acanthoides G. D. Barbe, N. Palmer 1982-6-4 3639 Colusa 1.7 miles north of Pacific Ridge Forest Station, Mendocino National Forest. Comment
  CHSC78603  Carduus pycnocephalus J. Marr; C. Warren, J. Michaels 1998-5-4 Colusa Vicinity of Sites, Logan Ridge and Golden Gate. 76 Comment
  UCD159527  Carduus pycnocephalus subsp. pycnocephalus D. S. Park 2011-4-6 276 Colusa Off Rt. CA-20. Roadside. Disturbed. Comment
  JEPS110538  Carex amplifolia Lowell Ahart 2006-10-31 13536 Colusa Big Springs, on the south side of Letts Lake, about 13 miles (air) southwest of Stonyford 1529 Comment
  RSA523880  Carex bolanderi Barbara Ertter 1989-7-1 8607 Colusa Road to Goat Mountain Lookout 1.7 miles S of Rt. M-10 (Bear Creek-Fouts Spring Road) at head of S Fork Stony Creek, ca. 12 airmiles WSW of Stonyford. 1463 Comment
  SEINET7556704 Image available Carex densa Lowell Ahart 2006-8-22 13213 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS101036  Carex deweyana subsp. leptopoda Dean W. Taylor 1992-6-10 12699 Colusa Highway 162, Alder Springs Road, ca. 2 miles west from junction with Grindstone Road, 1371 Comment
  JEPS109533  Carex hassei Dean W. Taylor 1992-6-10 12701 Colusa Highway 162 Alder Springs Road, ca 2 miles west from Grindstone Road 1371 Comment
  CAS-BOT-BC35776  Carex jonesii L. R. Heckard 1974-9-10 3913 Colusa Snow Mt.;northeast slope of West Peak 2072 Comment
  CAS-BOT-BC31226  Carex lenticularis var. impressa L. R. Heckard 1972-7-8 3059 Colusa Upper reaches of Dark Hollow Creek in saddle between East and West Peaks of Snow Mt. 1981 Comment
  JEPS80275  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
  CHSC92669  Carex pachystachya D. Isle 2005-9-14 1173 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. Meadow west of Angel Spring, Snow Mountain Wilderness. 10S 0522348E 4358185N = Angel Springs. Comment
  UCD82620  Carex praegracilis Craig Thomsen; G. Harrington 2009-5-12 2889 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  UCD63115  Carex serratodens Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4946 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. 398 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
  JEPS80865  Carex subfusca L. R. Heckard and J. C. Hickman 1981-7-30 5771 Colusa along Trout Creek, se side of Snow Mt. Snow Mt., Trout Creek 1600 Comment
  CDA15498  Carex tumulicola G. F. Hrusa, T. D. Wilfred 1998-6-19 14635 Colusa North Coast Ranges; Near Goat Mtn. summit, adj. to intersection at Lake Co. boundary. NW side of summit area. Comment
  CAS-BOT-BC249071  Castilleja affinis Roxana S. Ferris 1917-4-19 574 Colusa 7 mi west of Arbuckle, Arbuckle - Rumsey Road 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
  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
  CDA12181  Castilleja applegatei subsp. martinii G. F. Hrusa 1993-5-2 10863 Colusa Frenzel Creek Research Natural Area; Point of ridge above mouth of Frenzel Creek, tributary of Little Stony Creek. S. side of creek. Comment
  CHSC81306  Castilleja applegatei subsp. martinii J. Trizzino 2001-3-31 12 Colusa Bear Valley Road about 2 mi from southern entrance to valley along west side of road. 408 Comment
  CHSC88871  Castilleja applegatei subsp. martinii Christine Hantelman 2000-4-1 46 Colusa At side of Bear Valley Road. 365 Comment
  HSC72113  Castilleja applegatei subsp. martinii J. P. Smith, Jane P. Nelson, Thomas W. Nelson 1978-4-2 9557 Colusa Bear Valley Rd., 2.1 mi. from its junction with Hwy. 20 366 Comment
  UCD97120  Castilleja applegatei subsp. martinii Ellen Dean; G. Harrington, J. Alderson 2011-4-10 6903 Colusa Along Brim Rd on east slope of Walker Ridge (Brim Rd becomes Bartlett Springs Rd). 438 Comment
  JEPS46009  Castilleja applegatei subsp. martinii L. R. Heckard and G. T. Robbins 1957-7-25 814 Colusa just e summit of Snow Mountain (West) (near Colusa-Lake County line); Snow Mountain (West) 2042 Comment
  CHSC115341  Castilleja attenuata Lowell Ahart 2015-4-10 20005 Colusa Normal size plants, on dark damp soil, along the south edge of Leesville Road. 445 Comment
  CHSC81307  Castilleja attenuata J. Trizzino 2001-3-31 16 Colusa Bear Valley Meadow along east side of Bear Valley Road. 396 Comment
  CHSC86031  Castilleja attenuata 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
  HSC47735  Castilleja attenuata Thomas W. Nelson, Jane P. Nelson 1978-4-29 3940 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  JEPS124209  Castilleja attenuata Lowell Ahart 2015-4-10 20005 Colusa About 1/2 mile east of Leesville, about 12 miles (air) northwest of Williams. Comment
  RSA0011988  Castilleja attenuata George K. Helmkamp, E. A. Helmkamp 2011-4-1 17122 Colusa Antelope Valley, along Maxwell-Sites Road, 1.8 miles southeast of Sites 77 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
  UCD56924  Castilleja attenuata Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3527 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Near headwaters of Craig Canyon. 359 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
  CHSC27511  Castilleja exserta Michael F. Henetz 1978-4-15 8 Colusa 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. S central border of Section 36. 332 Comment
  CHSC27558  Castilleja exserta W. K. Cheechov 1978-4-9 4 Colusa 5.1 mi w of Walker Ridge Rd., Hwy 20. 457 Comment
  UCR37943  Castilleja exserta Mike Malamus, P. Williams, Brian Kearney 1984-4-29 70 Colusa Bear Valley Road 2 mi north of Hwy 20 366 Comment
  CDA32834  Castilleja exserta P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  CHSC107973  Castilleja exserta subsp. exserta B. Castro; Robin Carter, Jessica Boyt 2011-4-25 1860 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; ca 5 air mi NW of Maxwell, 700 ft southeast of Funks Reservoir on hillside just northeast of outlet to Tehama-Colusa Canal. 66 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
  HSC65935  Castilleja exserta subsp. exserta C. Macdonald, P. Powers, C. Raley, J. Spitler, D. Stamp 1980-4-19 45 Colusa Along Bartlett Springs Rd., .6 mi. from Jct. with Hwy. 16 Comment
  HSC45672  Castilleja foliolosa Stephen Plant 1978-4-22 207 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 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
  CDA11255  Castilleja miniata subsp. miniata G. F. Hrusa 1994-11-7 11990 Colusa North Coast Biodiversity Arena; Banks of Little Stony Creek, approx. 2 miles above Stonyford-Lodoga Rd. on Goat Mtn. Rd. Comment
  RSA0037133  Castilleja miniata subsp. miniata David W. Isle 2013-8-23 2049 Colusa 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
  UC1238903  Castilleja rubicundula subsp. lithospermoides Freed W. Hoffman 1947-6-19 1657 Colusa Cook's Springs North Coast Ranges (w Colusa County) 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
  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
  SBBG111289  Castilleja rubicundula subsp. rubicundula J. M. Tucker 1980-5-3 4444 Colusa Bear Valley, 4.3 mi S of jct of Brim and Bear Rds, along W side of valley Comment
  UC1745694  Castilleja rubicundula subsp. rubicundula Annetta M. Carter, Sarah Dyal, Ethel Crum 1938-5-8 1389 Colusa S end of lake 0.4 mi. N of Lodoga. Comment
  UC903276  Castilleja rubicundula subsp. rubicundula Ethel Crum 1932-5-7 1458 Colusa Lodoga 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
  RSA0121887  Caulanthus flavescens Roxana S. Ferris 1926-4-23 6405 Colusa Near Mountain House on the Williams-Stonyford Road. Comment
  UCD114215  Caulanthus flavescens J. M. Tucker 1958-3-7 3364 Colusa State Highway 16, Cache Creek Canyon, 0.1 mile north of Yolo-Colusa County line. Comment
  CAS-BOT-BC40505  Caulanthus lasiophyllus Roxana S. Ferris 1926-4-22 6289 Colusa Tule land 3 miles west of Colusa. Comment
  CHSC86876  Caulanthus lasiophyllus B. Castro 2003-3-25 1404 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 182 Comment
  UCD67004  Caulanthus lasiophyllus Craig D. Thomsen 2008-4-7 2725 Colusa BLM Payne Ranch. Lands to the SW of Hwy 16/20 intersection. Cowboy Camp viewing area, 0.25 mile west of Hwy 16, 1 mile south of Hwy 20. Comment
  JEPS73517  Ceanothus cordulatus L. R. Heckard 1972-7-10 3136 Colusa between Foutch Camp and Trout Creek crossing (Snow Mt.); , between Foutch Camp and Trout Creek crossing 1828 Comment
  JEPS75840  Ceanothus cordulatus L. R. Heckard 1974-9-10 3909 Colusa Circle trail on w edge West Peak; Snow Mt. 2011 Comment
  JEPS42087  Ceanothus cuneatus var. cuneatus W. L. Jepson 1920-5-23 8964 Colusa near Leesville; SW Colusa Co., Bear Valley Comment
  UC80064  Ceanothus cuneatus var. cuneatus T. S. Brandegee Apr 1889 701 Colusa Leesville Comment
  HSC47467  Ceanothus integerrimus J. P. Smith, J. O. Sawyer 1978-4-29 9769 Colusa Walker Ridge Rd. 3.4 mi. from its jct. with Hwy. 20 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
  UCD170263  Ceanothus integerrimus D. O. Burge 2016-11-3 2187 Colusa Little Stony Creek watershed, roadside on Goat Mountain Road. 415 Comment
  UCD170330  Ceanothus integerrimus D. O. Burge 2016-11-3 2189 Colusa Walker Ridge, E of Indian Valley Reservoir, roadside on Bartlett Springs Road. 860 Comment
  UCD84451  Ceanothus integerrimus Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6059 Colusa Colusa County. On Lake County border. Walker Ridge. Along Walker Ridge Road, between Cold Spring and Buck Flat. 971 Comment
  UCD110813  Ceanothus jepsonii Christopher Mallek 2008-1 PR1- 2 Colusa Pacific Ridge. Border of Colusa and Lake Counties. 1101 Comment
  CAS-BOT-BC83782  Ceanothus jepsonii var. albiflorus D. O. Burge; Steven Kembel 2008-5-27 997 b Colusa Rathburn-Petray Mine complex, E of Eaton Springs 700 Comment
  CHSC79559  Ceanothus jepsonii var. albiflorus L. P. Janeway 2000-5-31 6775 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
  HSC43201  Ceanothus jepsonii var. albiflorus J. Walker 1977-4-24 27 Colusa Along Walker Ridge Rd. above Barrel Springs Campground 701 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
  UC1299512  Ceanothus palmeri Freed W. Hoffman 1947-6-19 1655 Colusa Cook's Springs Cook's Springs (western Colusa County) Comment
  CHSC86117  Centaurea melitensis Jenny Marr; Caroline Warren 1998-5-4 Colusa Vicinity of Sites, Stone Corral Creek, and Antelope Valley. 106 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
  CHSC94445  Centaurea solstitialis Lowell Ahart 2006-8-9 13148 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 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
  NY444420  Centaurea solstitialis R. J. Stinchfield 1916-7-12 474 Colusa Street- College City Comment
  SEINET11860767  Centaurea solstitialis C. L. Abbott 1926-6-27 s.n. Colusa Colusa Comment
  UCD82477  Centromadia Craig Thomsen; G. Harrington 2009-5-12 2855 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  UCD20134  Centromadia Donald W. Kyhos 1962-8-4 62 -184 Colusa 5.4 miles east of Colusa County line on Hwy 99. Comment
  CHSC107285  Centromadia fitchii L. P. Janeway; B. Castro 2011-7-9 10505 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. Generally natural area centered around a shallow ephemeral alkaline marsh and adjacent wetland swales. In an area that is not quite a vernal pool near the eastern boundary of the area. 49 Comment
  UCD66949  Centromadia fitchii Ellen Dean; Davis Botanical Society 2008-5-31 4994 Colusa west of I-5 at Maxwell, along Goat Mountain Road, immediately west of the junction with Lodoga-Stonyford Road. 382 Comment
  CAS-BOT-BC384657  Centromadia parryi subsp. parryi Andrew Townesmith; Karen M. Meyer 2007-8-7 909 Colusa Mendocino National Forest, Grindstone Ranger District. Vicinity of Mill Creek Campground/Davis Flat OHV staging area. Off Forest Service route M10, 8.2 miles west of intersection with Lodoga-Stonyford road in Stonyford 499 Comment
  UCD63776  Centromadia parryi subsp. parryi Craig D. Thomsen 2008-5-31 2757 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 20 and 16. Cowboy Camp area, west side of Hwy 16, 1 mile south of Hwy 20. In meadow, west of public viewing area between Bear Creek and hillslopes to the west. 279 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
  JEPS38150  Centromadia pungens subsp. pungens W. L. Jepson 1934-5-3 16600 Colusa n of Colusa (Stegeman Station) Comment
  CAS-BOT-BC279207  Centromadia pungens subsp. pungens A. A. Heller 1916-6-9 12391 Colusa Along the state highway near Colusa Comment
  CHSC107943  Centromadia pungens subsp. septentrionalis B. Castro; L. Janeway 2011-4-27 1861 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 5 air mi NW of Maxwell, 0.8 mi southeast of Funks Reservoir and 0.2 mi northeast of Tehama-Colusa Canal. At east side of large +- saline/alkaline wetland/ marsh; in vernal depression in compacted E-W road track that goes through marsh. 49 Comment
  JEPS80442  Cerastium glomeratum L. R. Heckard and J. Hickman 1980-7-3 5372 A Colusa s.w. slope of Snow Mt. (about Summit Springs) 1554 Comment
  SEINET11587890  Cercis canadensis var. texensis Unknown 2009-3-11 14378 Colusa Williams Comment
  RSA28390  Cercis occidentalis E. K. Balls, Percy C. Everett, B. K. Balls 1953-10-14 18671 Colusa 11.5 mi. s.w. of Williams, along Hwy 20 to Clear Lake. 213 Comment
  UCR37606  Cercis occidentalis C. Houseman, M. A. Strull, L. Linstedt 1984-4-29 14 Colusa Bear Valley Rd., 2 mi north of Hwy 20 366 Comment
  UCD83634  Cercocarpus betuloides Fanny Ye; with PLB 102 class 2010-5-2 5 Colusa East slope of Walker Ridge. Along Brim Road, between Bear Valley and Walker Ridge. 493 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
  UCD113068  Cercocarpus betuloides var. betuloides G. L. Webster 1989-5-6 7698 Colusa Near border with Lake County. Crest of Walker Ridge, near Cold Springs Mountain. Comment
  HSC71298  Cercocarpus montanus var. glaber Thomas W. Nelson, Jane P. Nelson 1979-4-12 4628 Colusa Along Stony Creek below Digger Pine Campground Comment
  JEPS15566  Chaenactis douglasii var. douglasii G. Thomas Robbins with L. R. Heckard 1956-7-25 3715 Colusa above Dark Hollow Creek (a trib. of Middle Fork Stony Creek, s flank of Snow Mt. East, between Snow Mt. East and Snow Mt. West); Snow Mt. East, Middle Fork Stony Creek 1981 Comment
  JEPS81415  Chaenactis douglasii var. douglasii L. R. Heckard and J. C. Hickman 1982-7-9 6023 Colusa near summit of, Lookout Goat Mt. (Colusa-Lake Counties boundary) 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
  CAS-BOT-BC277632  Chaenactis glabriuscula var. megacephala James Jokerst 1985-4-4 220 Colusa Near Rail Canyon Comment
  UC727669  Chamaesyce nutans Milo S. Baker 1946-9-4 11606 Colusa near locked gate Colusa Gun Club (Butte Sink); Butte Sink Comment
  CHSC77333  Chamaesyce serpillifolia subsp. serpillifolia Heidi West; Joyce Lacey-Rickert 1998-10-29 Colusa Vicinity of Antelope Valley and Sites. 109 Comment
  CHSC94311  Chamaesyce serpillifolia subsp. serpillifolia Lowell Ahart 2006-8-9 13104 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 422 Comment
  UC535094  Chamaesyce serpyllifolia Mrs. H. P. Bracelin 1931-10-1 564 Colusa about 7 mi n Leesville; Indian Creek 289 Comment
  JEPS75724  Cheilanthes gracillima L. R. Heckard 1974-9-9 3859 Colusa ca. 1/4 mi se Foutch Camp; Snow Mt 1828 Comment
  JEPS80052  Cheilanthes gracillima L. R. Heckard with J. Hickman 1979-6-15 5052 Colusa e trail from Frog Pond to cirque of e and w peaks Snow Mt (ne slope of West Peak ridge) 1981 Comment
  CHSC94510  Chenopodium album Lowell 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
  RSA140835  Chenopodium berlandieri var. sinuatum John H. Thomas 1960-8-30 8865 Colusa About 5 miles northwest of College City along road to Sycamore. Comment
  JEPS108912  Chenopodium botrys Lowell Ahart 2006-8-9 13098 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford 455 Comment
  RSA718051  Chenopodium botrys L. Ahart 2006-8-9 13098 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3.5 miles (air) west of Stonyford. 455 Comment
  JEPS123892  Chenopodium californicum Lowell Ahart 2015-4-28 20112 Colusa About 300 yards north of the intersection of Bear Valley Road and Brim Road, about 2 miles southwest of Leesville, about 14 1/2 miles (air) west of Williams. Comment
  UCD37231  Chloris gayana Beecher Crampton 1958-6-27 4980 Colusa Colusa County, 2.5 miles south of Grimes. Comment
  CHSC86512  Chorizanthe membranacea B. Castro 2003-3-18 1390 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 243 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
  SEINET7042721  Chrysothamnus parryi A. G. Vestal 1938-9-1 s.n. Colusa Along the top of a trough, Springs Ridge near Foxtrap Springs. Fouts Spring quadrangle UTM Zone 10, 530960mE, 4350980mN. Comment
  CDA15502  Cirsium cymosum G. F. Hrusa, WTD 1998-6-19 14641 Colusa North Coast Ranges; Below Fouts Springs on Fouts Springs Rd. to Stonyford. About 0.25 km. NE of where Candy Bucket Spring crosses rd. Comment
  JEPS81831  Cirsium cymosum var. cymosum L. R. Heckard 1969-5-28 2230 Colusa just below Candy Bucket Springs (on Stoneyford-Fouts Spring road) 670 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
  UCD84429  Cirsium occidentale Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6044 Colusa Walker Ridge. Along Walker Ridge Road on southern part of the ridge, south of turnoff to Indian Valley Reservoir. 683 Comment
  UCD57628  Cirsium occidentale var. venustum Michele Lanctot; 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 part of ranch. Thompson Canyon. Northern edge of trail. 361 Comment
  JEPS75715  Cirsium vulgare L. R. Heckard 1974-9-9 3841 Colusa just se Foutch Camp; Snow Mt. 1920 Comment
  UCD57861  Clarkia Gordon Harrington; Diana Hickson, Jack Alderson 2007-4-29 46 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
  CHSC79776  Clarkia affinis L. P. Janeway; B. Castro 2000-5-3 6698 Colusa Vicinity of head of Antelope Creek, and Huffmaster Road. 335 Comment
  CHSC86125  Clarkia affinis Jenny Marr; Caroline Warren 1998-5-4 Colusa Vicinity of Sites, Stone Corral Creek, and Antelope Valley. 106 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
  LA17909  Clarkia concinna Peter H. Raven; 1962-5-31 sn Colusa State Hwy 20, 2.5 mi E of Lake County line Comment
  RSA0020963  Clarkia concinna Joan Stewart 1998-6-10 758 Colusa Bear Valley 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
  UCD57721  Clarkia concinna subsp. concinna Jordan Thompson; with Plant Biology 102 2007-4-29 3 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. North side of Craig Creek on south side of unimproved road. 335 Comment
  UCD66685  Clarkia concinna subsp. concinna Craig D. Thomsen 2000-5-11 2312 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
  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
  SBBG4972  Clarkia gracilis H. and M. Dearing 1939-5-12 3330 Colusa 20 mi N of Williams Comment
  UCD82739  Clarkia gracilis Craig Thomsen; G. Harrington 2009-5-14 2920 Colusa Walker Ridge: south of spur road about 1/2 mile east of Walker Ridge Road, en route to Eaton Springs. 822 Comment
  CAS-BOT-BC164527  Clarkia gracilis subsp. albicaulis A. A. Heller 1916-6-6 12354 Colusa Coast Range on the grade about 3 miles west of Leesville Comment
  LA45424  Clarkia gracilis subsp. albicaulis G. L. Stebbins Jr.; Malcolm A. Nobs, J. A. Rattenbury 1947-4-27 3755 Colusa 3 mi. W of Leesville, on road to Bartlett Springs Comment
  LA47307  Clarkia gracilis subsp. albicaulis Francia Chisaki; Helen Sharsmith 1959-5-27 1339 Colusa about 0.25 mi. E of Cooks Spring Comment
  CHSC79533  Clarkia gracilis subsp. gracilis B. Castro; L. P. Janeway 2000-5-2 1113 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 231 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
  CHSC79534  Clarkia gracilis subsp. tracyi G. F. Hrusa 1998-6-19 14597 Colusa Northern California. North Coast Ranges. Along Little Stony Creek, on Goat Mtn. Rd. ~ 1/2 km. W of intersection with Lodoga-Stonyford Rd. UTM: 10S, 05401 N, 43499 E. 400 Comment
  UCD146724  Clarkia gracilis subsp. tracyi G. F. Hrusa 1998-6-19 14597 Colusa Inner North Coast Ranges. Along Little Stony Creek, on Goat Mountain Road. Around 1/2 km west of intersection with Lodoga-Stonford Road. 400 Comment
  UCD63914  Clarkia gracilis subsp. tracyi Craig D. Thomsen 2001-5-24 2504 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
  UCR212337  Clarkia gracilis subsp. tracyi Craig D. Thomsen 2001-5-24 2504 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
  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
  UCD104856  Clarkia purpurea Kathryn Johnson 1966-5-14 53 Colusa Ca. 2 miles E of Lodoga on road from Maxwell. Comment
  CAS-BOT-BC240292  Clarkia purpurea subsp. quadrivulnera Ellen Dean; C. Thomsen; G. Harrington; Davis Botanical Society 2010-6-5 6085 Colusa Walker Ridge. Along Walker Ridge Road, N of turnoff to Indian Valley Reservoir but S of Til Jones Springs 817 Comment
  UCR206289  Clarkia purpurea subsp. quadrivulnera George K. Helmkamp, E. A. Helmkamp 2009-5-20 14739 Colusa Central Inner Coast Ranges, along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 320 Comment
  UCR257973  Clarkia purpurea subsp. quadrivulnera Craig D. Thomsen, Gordon Harrington 2009-5-12 2840 Colusa Walker Ridge. Eaton Springs, c. 1 mi east of Walker Ridge Road 707 Comment
  CDA15467  Clarkia rhomboidea G. F. Hrusa, WTD 1998-6-19 14604 Colusa North Coast Ranges; Above upper Little Stony Creek. Goat Mtn. Rd. approx. 2 km. W of campground. Comment
  HSC94112  Clarkia rhomboidea G. Fred Hrusa 1998-6-19 14604 Colusa Above Upper Little Stony Creek, Goat Mtn. Rd., about 2 km W of campground 490 Comment
  UC1585901  Clarkia rhomboidea Barbara Ertter 1989-7-1 8597 Colusa 2.2 mi s of Rt. M-10 (Bear Creek-Fouts Spring Rd.) (road to Goat Mt. Lookout, at head of S. Fk. Stony Creek, ca. 12 air mi wsw of Stonyford) 1500 Comment
  UCD146723  Clarkia rhomboidea G. F. Hrusa 1998-6-19 14604 Colusa above upper Little Stony Creek. Goat Mountain Road around 2 km west of campground. 490 Comment
  CHSC91163  Clarkia unguiculata D. Isle 1995-6-7 1063 Colusa Mendocino National Forest--North Coast Ranges. Bear Creek Watershed. Bear Valley Rd. 2.6 miles NW of Hwy. 20/Hwy. 16 junction + 1.4 miles SE of Wilbur Springs Junction. N. edge of Bear Valley Rd. Comment
  SEINET9368255  Clarkia unguiculata Unknown 2009-5-20 14738 Colusa Glasscock Mountain Comment
  SEINET8214253  Claytonia exigua K. L. Chambers 1995-4-21 5855 Colusa Hwy. 20 east of Clear Lake, 1.0 mi. W of junction with Hwy. 16. Comment
  SEINET199010  Claytonia exigua subsp. exigua H. K. Sharsmith 1953-6-19 4281 Colusa Mendocino National Forest ; Near Trough Springs on Trough Springs Ridge 975 Comment
  JEPS86633  Claytonia exigua subsp. exigua L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-19 6693 Colusa w of Summit Springs (near road, sw flank of Snow Mountain, Colusa-Lake County line); Snow Mountain 1550 Comment
  SBBG106814  Claytonia exigua subsp. exigua K. L. Chambers 1988-3-24 5405 Colusa Hwy 20 ca. 22 mi W of Williams 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
  CDA11392  Claytonia parviflora G. F. Hrusa, K. van Katwyk 1995-4-22 12112 Colusa Inner North Coast Ranges; Approximately 7 m. N of intersection of Walker Ridge Road and Highway 20. S Comment
  UCD64520  Claytonia parviflora Craig D. Thomsen 2000-4-12 2126 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
  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
  CHSC101069  Claytonia parviflora subsp. parviflora David W. Isle 2002-4-18 1654 Colusa N of Fouts Springs, N of Chlorinator Building and Rd to Bathhouse Trail (Snow Mtn), N aspect of E drainage. In chamise site burned in 8/8/01 Trough Fire and part of Hydromulch Soil Erosion Study Plot. 524 Comment
  CHSC91069  Claytonia parviflora subsp. parviflora D. Isle 2002-4-18 181 Colusa Mendocino National Forest--North Coast Ranges. Upper Lake Watershed. So. of Bathhouse Trail Rd. 17N51, no. of Fonts Springs. 548 Comment
  RSA590192  Claytonia parviflora subsp. parviflora Michael A. Vincent, Robert M. Rhode 1996-3-30 7285 Colusa Along Bear Valley Rd. above Bear Creek, 1.4 mi. S jct. Wilbur Springs Rd. Comment
  UC1745696  Claytonia parviflora subsp. parviflora Annetta M. Carter, Sarah Dyal, Ethel Crum 1938-5-8 1382 Colusa Between Leesville & Stonyford. 6.6 mi. S of Lodoga. 3 mi. N of Leesville. Comment
  UC936184  Claytonia parviflora subsp. parviflora Ethel Crum 1938-5-8 2023 a Colusa 3 mi n Leesville; Inner North Coast Ranges Comment
  RSA755471  Claytonia parviflora subsp. parviflora David W. Isle 2002-4-18 1654 Colusa North of Fouts Springs, North of Chlorinator Building and Road to Bathhouse Trail (Snow Mountain). North aspect of east drainage. 524 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
  UCD66965  Claytonia perfoliata Ellen Dean; Davis Botanical Society 2008-5-31 5009 Colusa west of I-5 at Maxwell, east slope of Goat Mountain, along Goat Mountain Road, Cedar Grove Campground. 1311 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
  RSA114165  Claytonia saxosa H. K. Sharsmith 1953-6-20 4292 Colusa Summit of Goat Mtn, Mendocino National Forest, lake - Colusa Boundary. 1865 Comment
  JEPS121782  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 Reervation Road; in undesignated Section near Colusa Rancheria. Comment
  UCD95592  Clematis ligusticifolia 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
  UCD59793  Coix lacryma-jobi W. M. Mathisen 1921-11-1 s. n. Colusa Princeton. Comment
  UC1238969  Collinsia greenei Freed W. Hoffman 1948-6-28 2536 Colusa e side Black Diamond Mtn (near Glenn-Colusa county line); North Coast Ranges, Black Diamond Mtn 838 Comment
  CDA34126  Collinsia heterophylla P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  SEINET13406348  Collinsia sparsiflora R. R. Halse 2013-3-26 8743 Colusa Indian Valley, along the Leesville-Logoda Road ca. 5.5 miles S of Logoda, 3.2 miles N of the junction of the Leesville and Bear Valley Roads. 426 Comment
  CHSC70908  Collinsia sparsiflora var. arvensis Vernon Oswald; Lowell Ahart 1998-4-21 8946 Colusa Stonyford-Lodga Rd. 4.2 mi south of Stonyford. 384 Comment
  JEPS6657  Collinsia sparsiflora var. arvensis A. A. Heller 1937-4-24 15352 Colusa 15 m w Williams (Hwy 20) Comment
  JEPS94165  Collinsia sparsiflora var. arvensis Vernon Oswald and Lowell Ahart 1998-4-21 8946 Colusa Stonyford-Lodoga Rd. 4.2 mi. s. Stonyford 384 Comment
  UCD57726  Collinsia sparsiflora var. arvensis Jordan Thompson; 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/Eastern part of ranch. Craig Canyon. North side of Craig Creek on south side of unimproved road. 335 Comment
  POM253019  Collinsia sparsiflora var. arvensis A. A. Heller 1937-4-24 15352 Colusa On Highway #20, 15 miles west of Williams. Comment
  CHSC48647  Collomia diversifolia Vernon Oswald 1986-5-12 2011 Colusa Brim Rd. (Bartlett Springs Rd.) 2.1 mi w of Bear Valley Rd. On a roadcut. 487 Comment
  CHSC48648  Collomia diversifolia Vernon Oswald 1984-5-2 1167 Colusa Mendocino Nat. Forest, Fouts Spring Rd. (M10; 18N01) 5.7 mi w of Stonyford. On a road cut. 609 Comment
  HSC31583  Collomia diversifolia Thomas E. Higley 1974-5-4 70 Colusa 3/4 mi. N of T junction of Indian Valley. 854 Comment
  HSC42333  Collomia diversifolia M. A. Baker 1977-4-24 223 Colusa Walker Ridge Rd. above Barrel Springs Campground 701 Comment
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Jul 31 2014
  SEINET3860936  Collomia diversifolia Leigh A. Johnson, Robert L. Johnson 2005-5-23 05 -081 Colusa Walker Ridge Road, west side along a serpentine road cut, about a half mile south of Til Jones Spring.; 0 817 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
  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
  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
  UC71778  Convolvulus arvensis H. P. Chandler 1905-10-16 Colusa Princeton Comment
  CHSC67605  Cordylanthus palmatus James D. Jokerst 1988-8-23 3039 Colusa Colusa National Wildlife Refuge S of Willows, in Pond 3, E and adjacent to Ohm Rd. in southern-most cell E of the road. Comment
  NY28942  Cordylanthus palmatus D. W. Taylor 1988-8-8 10024 Colusa This specimen represents an endangered or threatened species. The specific locality has been removed from this record to protect this species from over-collection. These data may be supplied to researchers on request. Comment
  RSA516504  Cordylanthus palmatus R. D. Stone 1987-8-29 850 Colusa Corner of Colusa Nat'l Wildlife Refuge, W side of Ohm Road, 0.5 mile N of its jct. with Ware Road. 14 Comment
  NY28941  Cordylanthus palmatus R. D. Stone 1987-8-26 850 Colusa This specimen represents an endangered or threatened species. The specific locality has been removed from this record to protect this species from over-collection. These data may be supplied to researchers on request. Comment
  SEINET10582733  Cordylanthus palmatus R. D. Stone 1987-1 Colusa Comment
  JEPS14919  Cordylanthus pringlei Rimo Bacigalupi with G. T. Robbins, L. T. Dempster, and L. R. Heckard 1956-7-26 5748 Colusa 1/2 mi above Fir-Root Spring Public Camp (at summit of ridge forming Colusa-Lake Co. line, on Colusa side, e of head of Long Ridge, region about 7 mi s of Snow Mountain) 1402 Comment
  RSA505428  Cordylanthus pringlei R. C. Bacigalupi, G. Thomas Robbins, L. T. Dempster, L. R. Heckard 1956-7-26 5748 Colusa At summit of ridge forming Colusa-Lake County line, on Colusa County side, east of head of Long Ridge and 0.5 mile about Fir-root Spring Public Camp. Region about 7 miles south of Snow Mountain. 1402 Comment
  CAS-BOT-BC209738  Cornus glabrata Roxana Stinchfield 1916-7-9 413 Colusa Oak grove along Sacramento Riv., Phillips Ranch Comment
  CDA12198  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. Comment
  UCD67592  Cornus glabrata Charles Martin 1986-5-17 30 Colusa Along Fouts Spring Rd., 2.8 miles W of Stonyford, along roadside. Growing along small stream, soil dry, in direct sunlight. Small shrub, ca. 1m tall, flowers small, white. 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
  UCR206355  Cotula coronopifolia George K. Helmkamp, E. A. Helmkamp 2009-3-11 14381 Colusa Sacramento Valley, along CA-20, 0.1 mile east of its junction with I-5, north end of Williams 49 Comment
  UCD64262  Crassula connata Craig D. Thomsen 2000-3-31 2059 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
  UC75673  Crassula connata var. erectoides Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  UCD38810  Crepis acuminata Beecher Crampton 1958-5-19 4803 Colusa 5.5 miles south of Ladoga. 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
  CHSC107292  Cressa truxillensis L. P. Janeway; B. Castro 2011-7-9 10510 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. Just off of the northwest corner of the marsh. 49 Comment
  UC572539  Cressa truxillensis H. S. Yates 1936-8-14 6133 Colusa 3 mi. s. Colusa; Colusa Quad. 15 Comment
  SACT000805  Crypsis aculeata Herbert Mason 1945-7-11 Colusa Alkali Plains three miles above Colusa Comment
  SACT000807  Crypsis niliacea Herbert Mason 1945-7-11 Colusa Alkali Plains 3 miles above Colusa Comment
  CAS-BOT-BC190085  Crypsis schoenoides Milo S. Baker 1946-9-4 11621 Colusa Butte Sink near locked Gate of Colusa Gun Club. Comment
  CHSC52702  Crypsis schoenoides James Jokerst 1985-4-24 2494 Colusa Near Lurline Creek. 41 Comment
  CHSC94322  Crypsis schoenoides Lowell Ahart 2006-8-9 13096 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  JEPS104250  Crypsis schoenoides Lowell Ahart 2003-10-23 10675 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
  JEPS110434  Crypsis schoenoides Lowell Ahart 2006-8-9 13116 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  RSA724948  Crypsis schoenoides L. Ahart 2006-8-9 13116 Colusa North side and under the bridge across Stony Creek, just north of Stonyford; between the southwest 1/4 and southeast 1/4 348 Comment
  UC1950077  Crypsis schoenoides Barbara Ertter with Elizabeth Neese, Laura Fujii, Dawn Espindola 1989-10-21 8872 Colusa SE end of East Park Reservoir N of Lodoga Comment
  UCD59814  Crypsis schoenoides H. L. Mason 1945-7-11 12642 Colusa Near Butte Creek; Butte Lodge Outing Club, 3 miles above Colusa. Comment
  UC1100189  Crypsis vaginiflora Herbert L. Mason 1945-9-19 12718 Colusa below causeway over Butte Sink spillway (e bank of river, 1 mi above Colusa); Sacramento River, Butte Sink Comment
  UCD59963  Crypsis vaginiflora Beecher Crampton 1958-6-27 4986 Colusa 3.5 miles south of Colusa. Comment
  CAS-BOT-BC218808  Cryptantha excavata R. F. Hoover 1968-5-27 11099 Colusa Bear Creek canyon n. of Highway 20 (near Wilbur Springs), on barren crumbled shale Comment
  SBBG40520  Cryptantha excavata R. F. Hoover 1968-5-27 11099 Colusa Bear Crk cyn N of Hwy 20 (near Wilbur Springs) 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
  UC729980  Cryptantha hispidula Leo F. Koch 1940-4-29 935 Colusa 4 mi from Lake County line (along Highway 20) Comment
  UCD66613  Cryptantha hispidula Craig D. Thomsen 2000-5-11 2284 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
  UCD82520  Cryptantha hispidula Craig Thomsen; G. Harrington 2009-5-12 2877 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 713 Comment
  UCD83811  Cryptantha hispidula Ellen Dean; G. Harrington, K. Mawdsley, J. Shepard 2010-5-1 5958 Colusa Walker Ridge, along Walker Road, just N of main turnoff to Barrel Springs. 712 Comment
  UCD22647  Cryptantha hispidula Laura F. Galloway 1988-5-1 3 Colusa Bear Valley Road, 0.5 mile north of Brim Road. 411 Comment
  UCD70249  Cryptantha hispidula D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley. Destanella Flat-Walker Ridge. Annual grasslands in serpentine chaparral edges. 450 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
  UC857152  Cryptantha intermedia Alice Eastwood and John Thomas Howell 1938-5-16 5629 Colusa Lake-Colusa county line on road to Williams Comment
  UCR198141  Cryptantha intermedia Ellen Dean, C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3673 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
  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
  HSC48168  Cryptantha intermedia var. hendersonii Thomas W. Nelson, Jane P. Nelson 1978-4-29 3932 Colusa Along Bear Valley Rd., 2 mi. from the junction with State Route 20. 366 Comment
  UCD163839  Cryptantha intermedia var. intermedia Craig D. Thomsen 2001-4-12 2469 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  CHSC79477  Cryptantha microstachys B. Castro; L. P. Janeway 2000-5-4 1142 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 249 Comment
  UC726039  Cryptantha microstachys A. A. Heller 1940-6-7 15713 Colusa ridge e of Lodogo (just above the road leading to Sites) Comment
  JEPS80776  Cryptantha simulans L. R. Heckard and J. Hickman 1981-7-30 5749 Colusa se side Snow Mt. (Trout Creek trail); , Trout Creek 1630 Comment
  UC1299423  Cryptantha simulans Freed W. Hoffman 1947-6-19 1620 Colusa road from Stonyford to Fouts Springs (w Colusa County); North Coast Ranges Comment
  CHSC32209  Cryptantha torreyana James Jokerst 1980-8-7 1064 Colusa North Coast Ranges. Near Snow Mountain (west). Ridge top. Comment
  JEPS80034  Cryptantha torreyana L. R. Heckard 1974-9-10 3900 A Colusa top of East Peak Snow Mt., East Peak 2148 Comment
  UCD110847  Cupressus macnabiana Christopher Mallek 2008-1 FC- 1 Colusa Frenzel Creek. 654 Comment
  JEPS87787  Cupressus sargentii Vernon H. Oswald and Lowell Ahart 1994-3-23 6010 Colusa s side Little Stony Creek (in section on e side of Frenzel Creek, s of Stonyford); Frenzel Creek Research Natural Area 518 Comment
  JEPS87788  Cupressus sargentii Vernon H. Oswald and Lowell Ahart 1994-3-23 6010 Colusa s side Little Stony Creek (in section on e side of Frenzel Creek, s of Stonyford); Frenzel Creek Research Natural Area 518 Comment
  JEPS95531  Cupressus sargentii Vernon H. Oswald and L. Ahart 1994-3-23 6010 Colusa T17N R6W NW1/4 Sec. 32, 1700 ft, Chaparral. 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
  UC1585395  Cupressus sargentii R. Raiche 1989-11-1 90339 Colusa W of Williams, NW of Wilbur Springs, Walker Ridge, Freshwate Branch of E Fork Sulphur Creek between Signal Rock and Oak Grove 730 Comment
  CHSC114931  Cuscuta approximata CDFA Staff 2011-11-5 Colusa Maxwell. Comment
  UCD37715  Cuscuta brachycalyx Beecher Crampton 1961-7-20 5935 Colusa 4 miles SE of Grimes, along Knight's Landing Road. Comment
  SEINET810124  Cuscuta indecora Steven P. McLaughlin 1986-1 4213 Colusa Sacramento Valley, 3.5 miles E. of Arbuckle Comment
  UCD163659  Cuscuta indecora var. indecora Craig Thomsen 1998-6-10 1957 Colusa Bear Valley. About 8.5 miles north of Hwy 20. Comment
  RSA313623  Cycladenia humilis Brandegee 1892-6-23 s.n. Colusa Snow Mountain Comment
  UC1151661  Cynodon dactylon Beecher Crampton 1958-6-26 4975 Colusa 5.5 mi s College City Comment
  UCD60064  Cynodon dactylon Beecher Crampton 1963-9-9 6891 Colusa 1/4 mile E of Cortena. 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
  CAS-BOT-BC114781  Cyperus acuminatus Roxana Judkins [later Mrs. Ferris q.v.] Stinchfield 1916-7-11 465 Colusa Davis tule, near Sycamore Slough. Comment
  UC1100541  Cyperus difformis Malcolm A. Nobs and S. Galen Smith 1949-9-9 1877 Colusa 3 mi. w. Williams Comment
  UCD141020  Cyperus difformis June McCaskill 1954-8-9 362 Colusa ca. 2 mi. east of Princeton and 400 yds. south of Glenn County line. Comment
  SEINET9753686 Image available Cyperus eragrostis Richard Carter 2006-7-31 Colusa 3.7 mi SSE Colusa, jct. Hwy CA 20 and Hwy CA 45 Comment
  UCD54036  Cyperus eragrostis K. Esau; D. Hartmenn 1941-7-17 s.n. Colusa near Williams. Comment
  JEPS64102  Cyperus erythrorhizos W. L. Jepson 1929-10-1 15342 Colusa Maxwell 25 Comment
  UC698542  Cyperus erythrorhizos P. B. Kennedy 1925-9-8 Colusa Cortena Comment
  UC72520  Cyperus erythrorhizos H. P. Chandler 1905-9-14 Colusa Princeton 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
  CHSC91049  Cystopteris fragilis D. Isle 2003-6-9 361 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. In drainage that feeds Cedar Creek. 1447 Comment
  RSA714647  Dactylis glomerata Daisie Huang 2006-4-15 6041502 Colusa Maxwell rest stop on I-5. 25 Comment
  CAS-BOT-BC445509  Damasonium californicum A. A. Heller; H. E. Brown 1902-5-1 5437 Colusa Near Colusa Comment
  CHSC80454  Damasonium californicum Caroline Warren; Jenny Marr, Heidi West 1998-7-1 Colusa Vicinity of Peterson Road and Funks Creek. 91 Comment
  UC194964  Damasonium californicum H. M. Hall 1916-8-10 10265 Colusa Colusa Sacramento Valley, Colusa Comment
  POM208489  Damasonium californicum H. M. Hall 1916-8-10 10265 Colusa Sacramento Valley. Comment
  UCD35946  Damasonium californicum Beecher Crampton 1953-4-29 1148 Colusa 7 miles east of Maxwell. Comment
  JEPS75727  Danthonia californica L. R. Heckard 1974-9-9 3863 Colusa around spring and small stream just ne rocky promontory southeast of Foutch Camp; Snow Mt. 1798 Comment
  RSA724964  Datisca glomerata L. Ahart 2006-8-9 13146 Colusa North side and just east of the bridge across Stony Creek, just north of Stonyford 348 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
  UC26117  Datura stramonium J. Burtt Davy May, 1898 4301 Colusa near Princeton; near Princeton Comment
  CHSC113039  Datura stramonium var. tatula Lowell Ahart 2013-10-1 19083 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
  JEPS120992  Daucus pusillus Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18625 Colusa Rocky serpentine outcrop on the north side of Hwy 20, just east of Lake County line, 12.2 air miles east northeast of the town of Clear Lake, 17.1 air miles west of Williams. Comment
  UCD63774  Daucus pusillus Craig D. Thomsen 2008-5-23 2754 Colusa BLM Payne Ranch. Southwest of intersection of Hwy 16 and Hwy 20. About 1 mile south of Hwy 20 (south of Destanella Flat) and 2.5 miles west of Hwy 16. 420 Comment
  POM174571  Daucus pusillus Roxana S. Ferris 1926-4-23 6587 Colusa 2 miles from Stony Ford. Comment
  CAS-BOT-BC376273  Delphinium Greg de Nevers 1995-5-27 10732 Colusa Near Lodobo 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
  UCD95852  Delphinium hesperium June McCaskill 1962-5-2 652 Colusa On road along Bear Creek from State Highway 20 north to Leesville, 7 miles north of Wilbur Springs turnoff. Comment
  CDA15469  Delphinium hesperium subsp. pallescens G. F. Hrusa, T. D. Wilfred 1998-6-19 14606 Colusa North Coast Ranges; Scattered perennial on steep slope within chaparral above upper Little Stony Creek. Goat Mtn. Rd. ~ 1.5 km. W of of campground. Non-serpentine. Flowers blue, other plants nearby range to light blue and pinkish. Crown attachment firm. Comment
  HSC97314  Delphinium hesperium subsp. pallescens Roman Gaukin 1958-5-4 Colusa Bear Valley Comment
  UC1777719  Delphinium hesperium subsp. pallescens Roman Gaukin 1958-5-4 Colusa Bear Valley Comment
  UCR261658  Delphinium hesperium subsp. pallescens Ann Howald 2003-4-23 2308 Colusa Inner North Coast Ranges, Goat Mountain Road, c. 1 mile west of intersection with Lodoga-Stonyford Road 400 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
  HSC85787  Delphinium nudicaule Tim Tilgham, Rob Marheine, Bruce Delgado 10 Apr [year missing] Colusa N side of Bartlett Springs Rd. Comment
  CAS-BOT-BC17044  Delphinium recurvatum Mrs. H. C. Cantelow 1936-4-11 1208 Colusa Bear Creek Canyon. Comment
  UC1585383  Delphinium uliginosum R. Raiche 1989-6-20 90163 Colusa near Eaton Spring (w of Williams, n of Wilbur Springs); Walker Ridge, Deadshot Flat 710 Comment
  UCD82510  Delphinium uliginosum Craig Thomsen; G. Harrington 2008-5-12 2868 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  SFV1292  Delphinium variegatum B. J. McCaskill 1962-5-2 651 Colusa On road along Bear Creek from State Highway 20 north to Leesville. 3.6 miles north of Wilbur Springs turnoff. About 200 yards west of road. 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
  UCR47948  Delphinium variegatum C. Pauls 1975-4-20 4 Colusa Bear Valley Rd., 8.7 mi north of State Hwy 20 Comment
  CDA32828  Delphinium variegatum P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  SEINET5338170  Delphinium variegatum W. Roderick 1967-5-7 s.n. Colusa Bear Valley. 305 Comment
  SEINET5718465 Image available Delphinium variegatum Robert A. Christison 1960-1 29 Colusa On State Hwy 16, ca. 3 miles from Yolo-Colusa county border. 183 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
  UCD23392  Delphinium variegatum Patrick Fox 1977-5-8 20 Colusa Open field 9.5 miles north of Highway 20 on Bear Valley Rd. Comment
  CAS-BOT-BC16957  Delphinium variegatum subsp. variegatum Roxana S. Ferris 1917-4-12 517 Colusa 4 miles east of Williams Comment
  CAS-BOT-BC16958  Delphinium variegatum subsp. variegatum Roxana S. Ferris 1926-4-23 6582 Colusa field 2 miles from Stonyford Comment
  CHSC1465  Delphinium variegatum subsp. variegatum 1946-4-18 Colusa Cache Creek. 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
  UC71644  Delphinium variegatum subsp. variegatum Miss Alice King 1905-1 Colusa College City 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
  CAS-BOT-BC16956  Delphinium variegatum subsp. variegatum Wayne Roderick 1967-5-7 s.n. Colusa Bear Valley 304 Comment
  SEINET3927152  Deschampsia cespitosa Fred W. Hoffman 1944-7-13 1949 Colusa Between Indian and Bear valleys, western.; 0 Comment
  JEPS75874  Deschampsia cespitosa subsp. cespitosa L. R. Heckard 1974-9-9 3866 Colusa just n.e. of rocky promontory s.e. of Foutch Camp (Snow Mt.); Snow Mt. 1920 Comment
  JEPS80431  Deschampsia cespitosa subsp. cespitosa L. R. Heckard 1974-9-9 3867 Colusa just n.e. of rocky promontory s.e. of Foutch Camp (Snow Mt.); Snow Mt. 1920 Comment
  CAS-BOT-BC192667  Deschampsia danthonioides Roxana S. Ferris 1917-4-12 549 Colusa 4 miles East of Williams 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
  POM207094  Deschampsia danthonioides A. H. Heller 1902-5-1 5435 Colusa Near College City Comment
  UCD163709  Deschampsia danthonioides Craig Thomsen 1999-5-10 2021 Colusa Colusa County. At confluence of Sulphur Creek and Bear Creek. About 3 miles north of Hwy 20. Comment
  UCD163856  Deschampsia danthonioides Craig D. Thomsen 2001-4-26 2483 Colusa Bear Valley. About 7 miles north of Hwy 20. 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
  JEPS75750  Deschampsia elongata L. R. Heckard and R. Bacigalupi 1976-9-6 4430 Colusa along trail from Summit Springs to Fouts Camp (Snow Mt.); Lake-Colusa Co. Line, Snow Mt. 1798 Comment
  JEPS75873  Deschampsia elongata L. R. Heckard 1974-9-9 3848 Colusa just s.e. of Foutch Camp (Snow Mt.); Snow Mt. 1920 Comment
  JEPS80089  Dicentra formosa L. R. Heckard with J. Hickman 1979-6-16 5097 Colusa s of Milk Ranch (nw of West Peak, Snow Mt.); Snow Mt. 2011 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
  CAS-BOT-BC500072  Dichelostemma capitatum Roxana S. Ferris 1917-4-17 614 Colusa Sycamore Slough Comment
  HSC83387  Dichelostemma capitatum subsp. capitatum Bob Wych 1975-4-20 18 Colusa 8.7 mi. N of Hwy. 20 on Wilbur Springs Rd. Comment
  UCD139269  Dichelostemma volubile K. Esau 1934-5-5 s.n. Colusa Tahoe-Ukiah Highway, west of Williams. Comment
  CAS-BOT-BC277740  Dichelostemma volubile Mona Bourell 1997-3-29 5808 Colusa Mendocino National Forest along Road near Brittan Ranch, 0.1 mi. N of North Fork Campground Comment
  CAS-BOT-BC503140  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
  UCD139273  Dichelostemma volubile Carl Pfeiffer 1978-5-6 23 Colusa Bear Valley, Walker Ridge, 0.1 mile south of Bartlett Springs Road. 670 Comment
  UC1100289  Digitaria ischaemum Herbert L. Mason 1945-9-19 12722 a Colusa 1 mi n Colusa (below causeway over Butte Sink spillway, e bank Sacramento River); e bank Sacramento River, Butte Sink spillway Comment
  LA8596  Digitaria sanguinalis H. S. Yates; 1936-8-14 6138 Colusa 3 mi. S of Grimes 15 Comment
  SEINET199008  Diplacus layneae Helen K. Sharsmith 1953-1 4290 Colusa Mendocino Nat For; In metamorphic rubble of forest clearing, 5 mi beyond Trough Springs on rd to Goat Mt. 1280 Comment
  CAS-BOT-BC208649  Distichlis spicata Roxana S. Ferris 1926-4-22 6291 Colusa 3 miles west of 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
  SBBG119745  Distichlis spicata L. Ahart 2006-9-26 13353 Colusa N side of Maxwell Rd, between the deep ditch and the Delevan Nat Wildlife Refuge, ca. 3 mi W of Colusa Princeton Rd, ca. 5.5 mi E of Maxwell 24 Comment
  UCD64170  Distichlis spicata Beecher Crampton 1958-6-27 4979 Colusa 2.5 miles south of Grimes. Comment
  SEINET11695738  Distichlis spicata C. Witham, Buck, J. 2001-4-30 154 Colusa 2 mi S of Colusa along Hwy 20, E of Hwy 20 and Colusa Airport, Dolan Ranch site Comment
  UCD64465  Distichlis spicata var. stricta Beetle 1946-6-27 4686 Colusa Junction of Wilber Springs Rd. and State Hwy. 20. Comment
  SEINET10831144  Distichlis spicata var. stricta A. Arthur Heller 1902-5-19 Heller 5569 Colusa Near Colusa. Comment
  CAS-BOT-BC433232  Dodecatheon hendersonii Richard R. Halse 2014-3-25 9030 Colusa Along the Sites-Logoda Road ca. 4.7 miles northeast of Logoda; on the west end of Grapevine Pass. 527 Comment
  RSA0060085  Dodecatheon hendersonii Richard R. Halse 2014-3-25 9030 Colusa Along the Sites-Logoda Road ca. 4.7 miles northeast of Logoda; on the west end of Grapevine Pass. 527 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
  UCD97119  Dodecatheon hendersonii Ellen Dean; G. Harrington, J. Alderson 2011-4-10 6902 Colusa Along Brim Rd on east slope of Walker Ridge (Brim Rd becomes Bartlett Springs Rd). 438 Comment
  HSC83326  Dodecatheon hendersonii Harold Grams 1975-4-12 10 Colusa Hwy. 16, 12.4 mi. N of Rumsey Comment
  CHSC48008  Downingia elegans Vernon Oswald 1984-7-20 1616 Colusa Lily Pond n of Letts Lake in Mendocino National Forest. 1280 Comment
  CHSC29750  Downingia insignis K. R. Stern 1980-6-1 6637 Colusa Vernal pool, south central border area of Colusa National Wildlife Refuge. 45 Comment
  POM312375  Downingia insignis H. L. Mason 1953-4-5 14506 Colusa 3 miles east of Maxwell Comment
  RSA261511  Downingia pulchella L. L. Ferwerda 1968-5-4 17 Colusa In Bear Valley, ca. 11 miles NW of State hwy 20. 409 Comment
  UCD56935  Draba verna Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3537 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Thompson Canyon. 344 Comment
  UCD81243  Drymocallis glandulosa Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5407 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Inside canyon that is located to the south of Brophy Canyon. 292 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
  UCD81726  Dudleya cymosa Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5729 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. 864 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
  CAS-BOT-BC242662  Echinochloa crus-galli Beecher Crampton 1963-9-9 6890 Colusa 1/4 mile east of Cortena Comment
  RSA725019  Echinochloa crus-galli L. 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
  SEINET1908436  Echinochloa crus-galli G. K. Helmkamp, E. A. Helmkamp 2008-1 14269 Colusa Sacramento Valley: along CA-20, 2 miles west of Meridian. 14 Comment
  UCD61064  Echinochloa muricata P. B. Kennedy 30-31 May 1922 Colusa Colusa. Comment
  CAS-BOT-BC197272  Echinochloa muricata var. microstachya Roxana Stinchfield 1916-7-11 472 Colusa Davis tule near Sycamore Slough Comment
  POM198499  Echinochloa muricata var. microstachya Roxana Stinchfield 1916-7-11 472 Colusa Davis Tule, near Sycamore Slough. Comment
  UCD61165  Echinochloa oryzicola Beecher Crampton 1963-9-9 6892 Colusa 1/4 mile E of Cortena, site of UC temporary experimental rice station 1923 - 1928. Comment
  CDA184  Echinochloa oryzoides P. B. Kennedy 1928-9-15 Colusa Rice Station, Cortena. 0 Comment
  UCD61170  Echinochloa oryzoides P. B. Kennedy 1925-9-18 Colusa Rice Station, Cortena. Comment
  UCD61177  Echinochloa oryzoides P. B. Kennedy 30-31 May 1922 Colusa Colusa. Comment
  UCD61179  Echinochloa oryzoides Beecher Crampton 1963-9-9 6893 Colusa 1/4 mile E of Cortena. Comment
  CAS-BOT-BC445568  Echinodorus berteroi Roxana Stinchfield 1916-7-11 436 Colusa Davis Tule near Sycamore Slough Comment
  CHSC84967  Echinodorus berteroi Lowell Ahart 2003-10-23 10671 Colusa On the east strand 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
  UC1100137  Echinodorus berteroi Herbert L. Mason and Verne Grant 1946-9-5 13118 Colusa 1.6 mi. w. Williams (rd. to Lake Co.) Comment
  CDA19006  Echinodorus berteroi R. Breckenridge 2000-9-25 PDR 958948 Colusa East Park Reservoir, vicinity of Stonyford. 0 Comment
  UCD137955  Echinodorus berteroi June McCaskill; W. A. Harvey 1954-8-9 368 Colusa west side of pete Bartnett's house, Tule Road, around 7 miles east of Arbuckle. 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
  UCD63619  Ehrendorferia chrysantha Craig D. Thomsen 2000-6-12 2369 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
  UC1101544  Elatine ambigua Malcolm A. Nobs and S. Galen Smith 1949-9-10 1892 Colusa 17 mi n Knights Landing (rice fields) Comment
  RSA158051  Elatine ambigua June McCaskill 1954-8-9 357 ` Colusa 2 miles E of Princeton and 300 yards S of Glenn County line. Comment
  UCD110439  Elatine ambigua June McCaskill 1954-8-9 357 Colusa ca. 2 miles east of Princeton and 300 yards south of Glenn County line. Comment
  UC1100601  Eleocharis engelmannii Malcolm A. Nobs, S. Galen Smith 1949-7-18 1006 Colusa 2.5 mi W of Williams Comment
  CAS-BOT-BC113365  Eleocharis engelmannii Malcom A. Nobs; Stanley Galen [S. Galen] Smith 1949-7-18 1006 Colusa West of Williams, 2.5 miles. Comment
  UCD49598  Eleocharis engelmannii John M. Tucker 1953-8-28 2676 Colusa In rice field; 7 miles east of Arbuckle, Colusa County, California. Comment
  UCD63131  Eleocharis parishii Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4961 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Meadow to the east of Destinella Flat, ca. 3 rd miles west of the junction with Hwy 16 on the south side of Hwy 20. 526 Comment
  SBBG83315  Elymus elymoides L. F. LaPre 1986-5-30 Colusa 1.5 mi W of Mendocino Nat Forest boundary on Stony Crk Rd; T18N, R7W, S34 670 Comment
  UCD164140  Elymus elymoides Craig Thomsen 2003-6-1 s.n. Colusa Bear Valley. About 9 miles north of Hwy 20. Near corner of sharp turn in central Bear Valley. Comment
  UCD61431  Elymus elymoides Beecher Crampton 1958-5-19 4815 Colusa Little Stony Creek Canyon 4-8 miles west of Lodoga. Comment
  JEPS76125  Elymus glaucus subsp. glaucus W. L. Jepson 1938-6-11 18991 Colusa on creek 4 mi se Wilbur Springs; Bear Creek Comment
  CAS-BOT-BC228536  Elymus multisetus A. A. Heller 1916-6-6 12357 Colusa Coast Range on the grade about 3 miles west of Leesville Comment
  JEPS76114  Elymus multisetus W. L. Jepson 1938-6-11 18989 Colusa 4 mi se Wilbur Springs; Bear Creek Comment
  UCD61453  Elymus multisetus Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3899 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
  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
  UCR257974  Elymus trachycaulus Ellen Dean, Craig D. Thomsen, Gordon Harrington, R. Wilmarth, R. Wenk 2010-6-2 6067 Colusa On Lake County border. Walker Ridge, along Walker Ridge Road, Buck Flat 873 Comment
  UCD62670  Elymus trachycaulus subsp. trachycaulus G. L. Stebbins Jr. 1939-7-11 2957 Colusa 3 miles west of Leesville. Comment
  CHSC94519  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
  UCD55446  Epilobium brachycarpum Ellen Dean; Gordon Harrington 2006-10-6 3271 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
  UCD81376  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
  JEPS80785  Epilobium ciliatum subsp. ciliatum L. R. Heckard and J. C. Hickman 1981-7-30 5758 Colusa se side of mt. Snow Mt., Trout Creek 1600 Comment
  CHSC86819  Epilobium cleistogamum Jenny Marr; Heidi West, Caroline Warren 1998-7-1 Colusa Vicinity of Sites, Golden Gate, Stone Corral Creek, and Funks Creek. Vernal pools. 103 Comment
  CHSC94471  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
  JEPS86627  Epilobium foliosum L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-19 6709 Colusa 0.5 mi ne Summit Springs (sw flank of Snow Mountain, Colusa-Lake County line); Snow Mountain 1640 Comment
  CHSC112253  Epilobium minutum Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18649 Colusa Inner North Coast Range. On the 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
  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
  UCD164046  Epilobium minutum Richard Philbrook 2016-4-9 4 Colusa BLM Bear Creek Ranch (Previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. Just southwest of corral at junction of 16 and 20. Northeast facing slopes of hill. 343 Comment
  CDA38115  Epilobium minutum T. C. Fuller 1958-5-27 s.n. Colusa South of Highway 20, 1 mile west of junction with Highway 16. 0 Comment
  CHSC101430  Epilobium nivium David Isle 1990-6-6 1527 Colusa On Lower Summit Valley Rock Outcrop W of Rd 17N10. 1682 Comment
  JEPS74981  Epilobium nivium L. R. Heckard 1974-9-11 3953 Colusa along Summit Springs trail Snow Mt. 1737 Comment
  UCSB4278  Epilobium torreyi Keator, Glenn 1958-6-17 Colusa Not far from Bartlett Springs in the foothills Comment
  JEPS118602  Epipactis gigantea B. Castro, L. P. Janeway 2001-6-3 1257 Colusa Inner North Coast Ranges. Spring at Grapevine flat, on top of Walker Ridge about 0.5 mi E of Baldy Mountain. Leesville 7.5' quad. Comment
  CAS-BOT-BC58020  Equisetum Roxana S. Ferris 1926-4-21 6312 Colusa Near Sycamore. Comment
  CHSC94512  Equisetum laevigatum Lowell Ahart 2006-8-22 13210 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  CAS-BOT-BC213552  Eragrostis hypnoides Roxana Stinchfield 1916-7-8 383 Colusa In bed of Sycamore Slough. Comment
  CHSC84966  Eragrostis hypnoides Lowell Ahart 2003-10-23 10674 Colusa On the east strand 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
  RSA129661  Eragrostis hypnoides H. S. Yates 1936-8-14 6139 Colusa 3 miles S. of Grimes 15 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
  UC1950146  Eragrostis hypnoides Barbara Ertter with Elizabeth Neese, Laura Fujii, Dawn Espindola 1989-10-21 8878 Colusa NW side of East Park Reservoir near end of East Park Road from Stonyford Comment
  RSA725279  Eragrostis pectinacea L. Ahart 2006-8-22 13206 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
  CHSC94401  Eragrostis pectinacea var. pectinacea Lowell Ahart 2006-8-9 13164 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  CHSC92674  Eriastrum brandegeeae David Toren 2002-6-19 1241 Colusa Mendocino National Forest - North Coast Ranges Middle Fork Stony Creek Watershed. Auk Auk Ridge in 2001 Trough Fire Area. 731 Comment
  UC1299602  Eriastrum brandegeeae Freed W. Hoffman 1947-6-20 1605 Colusa road from Stonyford to Fouts Springs Comment
  CHSC111703  Eriastrum brandegeeae David Isle; F. Thomas Griggs 1979-5-23 2063 Colusa Little Stony Creek Watershed. 1/2 mile W of Lodoga Rd/Goat Mtn. Rd junction, off S side Goat Mtn. Rd (off both sides within 6 feet of rd.). 402 Comment
  JEPS123253  Eriastrum tracyi David Gowen 2004-5-18 85 Colusa South of Stonyford. Along Goat Mt. Road not far from its junction with the paved road to Stonyford. Comment
  IRVC29632  Ericameria cuneata Mark A. Elvin, Mark S. Brunell, David Isle 2006-8-3 5026 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
  CDA11387  Ericameria linearifolia G. F. Hrusa, K. van Katwyk 1995-4-22 12107 Colusa Inner North Coast Ranges; Walker Ridge Road approximately 3 miles N of Highway 20. Comment
  CHSC62837  Ericameria linearifolia Vernon H. Oswald; Lowell Ahart 1994-3-23 6019 Colusa Goat Mtn. Rd. just W of the bridge over Sullivan Creek, S of Stonyford. Along road. 505 Comment
  HSC72122  Ericameria linearifolia J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-1 9527 Colusa Walker Ridge Road, 3.2 mi. from its junction with State Route 20. Comment
  UCD131145  Ericameria linearifolia G. F. Hrusa; K. Van Katwyk 1995-4-22 12107 Colusa Inner North Coast Ranges. 950 Comment
  UCD163349  Ericameria linearifolia Craig D. Thomsen 2000-5-12 2329 Colusa Walker Ridge. Along road to Elgin Mine. Comment
  UCR261620  Ericameria linearifolia Ann Howald 2003-3-25 2285 Colusa Inner North Coast Ranges, Indian Valley, west side of East Park Reservoir, near dam, west of Little Stony Creek 355 Comment
  UCD131766  Erigeron canadensis P. B. Kennedy 30-31 May 1922 s.n. Colusa near Cortina. Comment
  UCD84636  Erigeron greenei G. Harrington 2009-7-7 84 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones spring area on W side of road. Ca 6.5 road miles N of junction with Hwy 20. W side of road. 833 Comment
  CHSC32217  Erigeron petrophilus var. petrophilus James Jokerst 1980-8-6 1056 Colusa North Coast Ranges. Near Snow Mountain (WEST). Comment
Read comments
Jul 16 2007
  JEPS75723  Erigeron petrophilus var. petrophilus L. R. Heckard 1974-9-9 3858 Colusa 0.25 mi se Foutch Camp; Snow Mt. 1828 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
  SEINET3245667  Eriodictyon californicum G. K. Helmkamp, E. A. Helmkamp 2009-1 14759 Colusa Inner North Coast Ranges: along CA-16, 1.8 miles north of the Yolo County Line (Glascock Mountain 7.5') 271 Comment
  UCD72480  Eriodictyon californicum Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3814 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
  UCR206378  Eriodictyon californicum George K. Helmkamp, E. A. Helmkamp 2009-5-20 14759 Colusa Inner North Coast Ranges, along CA-16, 1.8 miles north of the Yolo County line 271 Comment
  CDA15553  Eriogonum dasyanthemum G. F. Hrusa 1998-10-28 14904 Colusa North Coast Ranges; Summit of Walker Ridge. Comment
  CHSC92835  Eriogonum dasyanthemum D. Isle 2000-6-7 1245 Colusa Mendocino National Forest -- North Coast Ranges Little Stony Creek Watershed. Junction of Frenzel Creek with Little Stony Creek Road. 426 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
  JEPS120713  Eriogonum dasyanthemum Lowell Ahart 2013-10-1 19066 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
  UC1552811  Eriogonum dasyanthemum Frederica Bowcutt 1985-6-19 606 Colusa ridge about 2 air miles n Wilbur Hot Springs (just sw of Bear Valley); Wilbur Springs Quad (15') Comment
  UC1552830  Eriogonum dasyanthemum Frederica Bowcutt 1985-5-5 509 Colusa ca. 1 mi nw Wilbur Springs Comment
  UC1736002  Eriogonum dasyanthemum Dean W. Taylor 1992-6-10 12693 Colusa Highway 162 Alder Springs Road, ca. 4 miles west from junction in Stony Creek valley 762 Comment
Read comments
Feb 23 2009
  UCD163236  Eriogonum dasyanthemum Craig D. Thomsen 2000-6-7 2362 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
  UCD55455  Eriogonum dasyanthemum Ellen Dean; Gordon Harrington 2006-10-6 3279 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
  UCD61477  Eriogonum dasyanthemum Ellen Dean; Gordon Harrington 2006-10-6 3279 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
  CAS-BOT-BC242577  Eriogonum dasyanthemum Ella D. Cantelow 1957-5-31 s.n. Colusa 4 mi. west of Leesville on grade above Bear Valley Comment
  CDA22488  Eriogonum dasyanthemum T. C. Fuller 1958-5-27 Colusa Highway 20, 1.5 miles west of junction with Highway 16. 0 Comment
  UC1299724  Eriogonum dasyanthemum Freed W. Hoffman 1947-6-19 1654 Colusa near Wilbur Springs Comment
  UCD70225  Eriogonum dasyanthemum 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
  UCD67672  Eriogonum fasciculatum var. fasciculatum D. Sanchez-Mata 1996-6-20 s.n. Colusa Williams. Blue Ridge. Bear Valley. Bear Creek. Serpentine chaparral. 350 Comment
  CAS-BOT-BC250371  Eriogonum gracile Roxana Stinchfield 1916-6-18 307 Colusa Near College City 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
  CHSC32218  Eriogonum nervulosum James Jokerst 1980-9-6 1055 Colusa Near Snow Mountain (West). Comment
  IRVC29687  Eriogonum nudum var. pubiflorum Mark A. Elvin, Mark S. Brunell, David Isle 2006-8-3 5031 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
  JEPS56620  Eriogonum nudum var. pubiflorum W. L. Jepson 1934-7-28 16750 Colusa hills se Cortina Valley Comment
  UCR44921  Eriogonum tripodum 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-BC267476  Eriogonum umbellatum Mark A. Elvin; Mark S. Brunell; David Isle 2006-8-3 5032 Colusa Southern Northern Inner Coast Ranges: Snow Mtn; Summit Spring Trail; 1.4km W of Snow Mtn West summit; 800m N of Cedar Camp 1989 Comment
  JEPS73454  Eriogonum umbellatum var. bahiiforme L. R. Heckard 1972-7-8 3054 Colusa n side of ridge running se Snow Mt., West Peak 1981 Comment
  UCD66997  Eriogonum wrightii var. trachygonum Gordon Harrington 2008-8-14 80 Colusa BLM Payne Ranch. Lands to the SW of Hwy 16/20 junction. Just south of the Brophy Creek - Bear Creek confluence on the east side of Bear Creek (west side of Hwy 16). North side of gravel turn-out. 210 Comment
  CAS-BOT-BC308095  Eriophyllum lanatum var. achilleoides Pat Daly; Rudy Galindo 1988-4-16 54 Colusa 3.7 miles west on Goat Mountain Road off of Lodoga-Stonyford Road to Digger Pine Campground 451 Comment
  CAS-BOT-BC308097  Eriophyllum lanatum var. achilleoides A. A. Heller 1916-6-6 12353 Colusa Coast Range on the grade about 3 miles west of Leesville 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
  HSC66004  Eriophyllum lanatum var. achilleoides Teri Bartowski, Shane Feusier, Ruth Takaki, Carol Zimmerer 1980-4-19 39 Colusa 5.4 miles from Lodoga, along Little Stony Creek at Digger Pine Campground Comment
  UC1484434  Eriophyllum lanatum var. achilleoides Dale E. Johnson with J. E. Eckenwalder 1974-6-2 128 Colusa On ridge connecting East and West peaks of Snow Mt. 1999 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
  CAS-BOT-BC308100  Eriophyllum lanatum var. achilleoides Roxana S. Ferris 1926-4-23 6445 Colusa Near top of Grapevine Grade between Stonyford and Sites 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
  HSC45749  Erodium cicutarium Stephen Plant 1978-4-22 213 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 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
  CHSC84964  Eryngium aristulatum Lowell Ahart 2003-10-23 10662 Colusa On the east strand 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
  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
  UCR198153  Eryngium aristulatum var. aristulatum Gordon Harrington 2007-6-29 70 Colusa BLM Payne Ranch, just west of the Hwy 20/Hwy 16 intersection, c. 300 ft uphill to the west of the corral 326 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
  CAS-BOT-BC40751  Erysimum capitatum Roxana S. Ferris 1917-4-14 576 Colusa Arbuckle-Rumsey Road. Foothills 7 miles west of Arbuckle. Comment
  CAS-BOT-BC40752  Erysimum capitatum Roxana S. Ferris 1926-4-23 6409 Colusa In grade beyond Mountain House on the Williams-Stonyford Road. 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
  CHSC97866  Erysimum capitatum T. C. Fuller; G. D. Barbe 1986-3-6 4260 Colusa Leesville Grade west of Williams. Comment
  CAS-BOT-BC40755  Erysimum capitatum G. B. Rossbach; R. P. Rossbach 1938-5-31 851 Colusa About 18 miles west of Williams. Comment
  UCD68111  Erysimum capitatum Kathleen A. Robson 1981-5-23 33 Colusa From Stonyford, take Fouts Springs Road 12 miles West, past Fouts Springs to Letts Lake, Mendocino National Forest. Growing on a steep roadcut bank at entrance to lake, on loose dry soil, in full sunlight, individual plants not very abundant in area. Flowers, bright orange. 1219 Comment
  HSC6769  Erysimum capitatum var. capitatum M. Dole 1963-4-15 67 Colusa 6 mi. S of the junction of Hwys. 16 and 20 on Hwy. 16 Comment
  JEPS86638  Erysimum capitatum var. capitatum L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-18 6684 Colusa along trail from Frog Pond to East Peak; Snow Mtn. 1875 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
  CHSC110048  Erythranthe microphylla Lowell Ahart 2013-5-1 18688 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 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  CHSC35129  Erythranthe microphylla K. R. Stern 1980-5-5 6628 Colusa South central border area of Colusa National Wildlife Refuge. 45 Comment
  CHSC27633  Erythranthe nudata Tim Spira; Rober Schlising 1978-5-13 3236 Colusa Just E of Lake County line, along Hwy 20. Comment
  CAS-BOT-BC402663  Eschscholzia caespitosa Roxana S. Ferris 1926-4-23 6426 Colusa Summit of grade, Williams - Stonyford Road Comment
  CAS-BOT-BC402660  Eschscholzia caespitosa Brandegee 1889-4-1 s.n. Colusa Unspecified Comment
  UCD70236  Eschscholzia californica D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. Serpentine chaparral (Ceanotho albiflori-Quercetum duratae Sanchez-Mata, Barbour and Rodriguez in Rivas-Martinez 1997). 450 Comment
  CAS-BOT-BC402975  Eschscholzia californica Roxana Stinchfield 1916-7-12 473 Colusa College City Comment
  CAS-BOT-BC5881  Eschscholzia californica Townsend Stith Brandegee 1889-4-1 s.n. Colusa unspecified Comment
  SD8240  Eschscholzia californica Brandegee Apr 1889 Colusa Comment
  UC85498 Image available Eschscholzia caruifolia K. Brandegee Apr 1889 Colusa Colusa County. Near Leesville. Comment
  UC71635  Eschscholzia lobbii Miss Alice King 1905-1 Colusa College City Comment
  SEINET8523003  Eucalyptus globulus Kelly W. Allred 2006-1 Colusa Along I-5 south of Maxwell, road side rest stop 26 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
  CHSC70978  Euphorbia crenulata Vernon Oswald; Lowell Ahart 1998-5-7 8994 Colusa Bartlett Springs Rd. 1.6 mi west of Bear Valley Rd. Roadside bank. 487 Comment
  JEPS120975  Euphorbia spathulata Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18645 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
  CDA35306  Euphorbia spathulata Vernon H. Oswald & Lowell Ahart 1998-5-7 9002 Colusa Bartlett Springs Road, 2.1 miles west of Bear Valley Road, 0.8 mile east of Sawtelle Valley and Grapevine Flat Roads. Comment
  UCD142493  Euphorbia spathulata J. M. Tucker 1978-5-6 4407 Colusa On east side of Bear Valley Road, Bear Valley. 10.6 miles (by road) north of junction with State Highway 20. 365 Comment
  UCD63021  Extriplex joaquinana Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4673 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Slopes to the northwest of Eula Canyon and west of Cowboy Camp on the west side of Bear Creek. 451 Comment
  UCD63038  Extriplex joaquinana Ellen Dean; Marjorie Phan and Gerald Dickinson 2008-4-27 4884 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Along unnamed tributary of Bear Creek. 376 Comment
  UCD82479  Extriplex joaquinana Ellen Dean; Bob Schneider 2009-6-19 5779 Colusa BLM Bear Creek (formerly Payne) Ranch. Lands to the SW of the junction of Hwys 16 and 20. Ridges opposite Cowboy Camp parking area on W side of Bear Creek. 394 Comment
  CHSC110218  Festuca David Isle 1990-5-6 1983 Colusa Stony Creek watershed. Pendell Ranch abt 2 mi W of Co Rd 306 jct with Fouts springs Road; abt 150 yards south of Pendell home. 384 Comment
  UC2016538  Festuca bromoides Richard Olmstead 1984-4-29 530 Colusa On slopes by Walker Ridge Road 2.4 mi N of Calif. 20. Road follows ridge that is Lake/Colusa Co. line. Comment
  JEPS80815  Festuca elmeri L. R. Heckard and J. C. Hickman 1981-7-31 5788 Colusa e side Snow Mt. (trail from Foutch Camp to Box Springs) 1524 Comment
  JEPS80773  Festuca roemeri L. R. Heckard and J. C. Hickman 1981-7-30 5746 Colusa se side Snow Mt. (Trout Creek Trail) 1661 Comment
  JEPS81290  Festuca roemeri L. R. Heckard and J. C. Hickman 1982-7-5 5902 Colusa s of Summit Springs (s side of Snow Mt.); Snow Mt. 1500 Comment
  UCD63871  Forestiera pubescens Craig D. Thomsen 2008-5-31 2758 Colusa BLM Payne Ranch. Lands to the southwest of the intersection of Hwys 16 and 20. Cowboy Camp area on the west side of Hwy 16, 1 mile south of Hwy 20. 0.25 mile west of public viewing area and Bear Creek. 285 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-BC62916  Frangula californica subsp. tomentella Roxana Stinchfield 1916-7-10 478 Colusa Oak Grove - Phillip's Ranch. Comment
  CAS-BOT-BC62917  Frangula californica subsp. tomentella C. Hart Merriam 1923-5-9 s.n. Colusa Stony Ford. Comment
  UCD55463  Frangula californica subsp. tomentella Ellen Dean; Gordon Harrington 2006-10-6 3287 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
  CHSC80203  Frankenia salina B. Castro; G. Kuenster 2000-7-19 1207 Colusa Vicinity of Maxwell, Funks Creek, and the Glenn-Colusa canal, on low terrace beside S edge of shallow intermittent steam channel draining eastwasrd out of the hills east of Golden Gate. 54 Comment
  RSA123211  Frankenia salina H. S. Yates 1936-8-14 6135 Colusa 3 miles S. of Colusa 15 Comment
  CHSC79774  Fraxinus dipetala L. P. Janeway; B. Castro 2000-5-2 6697 Colusa Vicinity of Grapevine Creek and Sites-Lodoga Road. 256 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
  UCD70234  Fraxinus dipetala D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. 450 Comment
  CAS-BOT-BC223488  Fraxinus latifolia Roxana S. Ferris 1926-4-23 6433 Colusa Near Stonyford Comment
  UC1178025  Fraxinus latifolia Herbert L. Mason 1947-3-29 13156 Colusa ca 3 mi ne Colusa (along Butte Creek); Butte Creek Comment
  UCD122067  Fraxinus latifolia E. L. Hyde 1932-10-1 s.n. Colusa Miller's Landing. 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
  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
  CAS-BOT-BC130433  Fritillaria pluriflora James Jokerst 1985-4-10 2229 Colusa Near Walker Ridge Comment
  CAS-BOT-BC130434  Fritillaria pluriflora Barbara Menzies; Arthur Menzies 1967-3-18 s.n. Colusa 10 mi. north of Highway 20 (Bear Valley), 5 mi. north of Wilbur Springs cut-off Comment
  CHSC78108  Fritillaria pluriflora Dwayne Thomas 1999-4-3 22 Colusa Bear Valley Rd. 326 Comment
  HSC33041  Fritillaria pluriflora Thomas W. Nelson, James Nelson 1975-3-26 1772 Colusa Beside rd. to Bear Valley 7 mi. N of junction with Hwy. 20 Comment
  JEPS42811  Fritillaria pluriflora Wayne Roderick 1966-3-26 Colusa 1/2 mi e of Robbers Flat (adjacent to Bartlett Springs Road, Bear Valley); Bear Valley 417 Comment
  UC1479606  Fritillaria pluriflora R. Y. B. 1965-3-14 8387 Colusa ca. 9 - 10 mi. s. Leesville (Bear Valley Rd.) Comment
  UCD80816  Fritillaria pluriflora Ellen Dean, G. Harrington; K. Mawdsley, C. Thomsen, G. Walden, E. McDermott 2009-3-18 5272 Colusa BLM Bear Creek (Payne) Ranch, lands to the SW of the jct of Hwys 20 and 16. SE-facing slope above trail that links Thompson and Craig Canyons. 484 Comment
  SEINET8478939  Fritillaria pluriflora W. Roderick 1967-3-20 s.n. Colusa Bear Valley. Comment
  UCSB24339  Fritillaria pluriflora Roderick, Wayne 1966-3-26 Colusa Bear Valley, beside Bartlett Springs Road, 1/2 mile east of Robbers Flat Comment
  CDA15495  Fritillaria recurva G. F. Hrusa, WTD 1998-6-19 14632 Colusa North Coast Ranges; N side of Goat Mtn. summit area. Comment
  HSC71303  Galium andrewsii Thomas W. Nelson, Jane Nelson 1979-4-12 4623 Colusa Along Stony Creek below Digger Pine Campground Comment
  UCD66537  Galium andrewsii Craig D. Thomsen 2001-5-24 2496 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
  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
  JEPS80392  Galium aparine L. R. Heckard and J. Hickman 1981-6-22 5625 Colusa Dark Hollow Trail Snow Mt. 1965 Comment
  UC71638  Galium aparine Miss Alice King 1905-1 Colusa College City Comment
  UCD121724  Galium aparine William Pyott 1962-4-28 23 Colusa West of road in Bear Valley. Comment
  OBI78460  Galium bolanderi Helen K. Sharsmith & Francia Chisaki, Francia Chisaki 1959-5-27 1335 Colusa At Mill Crk crossing on rd leading out of Red Bridge Camp Comment
  JEPS52876  Galium californicum subsp. californicum Lauramay T. Dempster and G. L. Stebbins 1967-10-13 4366 Colusa 1.6 mi se Fir Root Camp (nw ridge of mt., ne-facing slope); Goat Mountain Comment
  JEPS15231  Galium grayanum var. nanum G. Thomas Robbins with L. R. Heckard 1956-7-25 3720 Colusa summit Snow Mt. West (Lake-Colusa Co. boundary) 2145 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
  CDA15454  Galium murale T. Gantenbein 1999-4-16 PDR 1198688 Colusa Central Valley; north Arbuckle. 0 Comment
  CHSC79906  Galium parisiense B. Castro; L. P. Janeway 2000-5-4 1130 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 246 Comment
  JEPS110109  Galium parisiense Lowell Ahart 2006-8-9 13149 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  UCD64440  Galium parisiense Craig D. Thomsen 2000-3-31 2080 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
  SEINET11117450  Galium parisiense Unknown 1959-1 s.n. Colusa At Mill Creek crossing on road leading out of Red Bridge Camp, Colusa County. Comment
  RSA15060  Galium porrigens Daniel Cleveland 1882-6-20 s.n. Colusa Allen Springs. Comment
  UCD163913  Galium porrigens var. porrigens Sara Martin 2016-4-9 5 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. 464 Comment
  UCD81242  Galium porrigens var. tenue Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5406 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Inside canyon that is located to the south of Brophy Canyon. 292 Comment
  UCR227343  Galium porrigens var. tenue Craig D. Thomsen 2001-5-24 2457 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
  CDA12374  Garrya congdonii G. F. Hrusa 1996-1-2 12627 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
  UCD121093  Garrya congdonii D. Sanchez-Mata 1996-6-20 s.n. Colusa Williams. Blue Ridge. Bear Valley. Bear Creek. 350 Comment
  UCD121094  Garrya congdonii D. Sanchez-Mata 1998-7-9 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain Road between Lodoga and Red Rock Cabin. 450 Comment
  UCD121096  Garrya congdonii Robert D. Slayback 1959-3-20 2 Colusa Near State Highway 16, 6 miles northwest of Rumsey. Comment
  UCD56678  Garrya congdonii Jack Alderson 2007-3-25 14 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
  RSA201851  Garrya flavescens subsp. congdonii Robert D. Slayback 1959-3-20 2 Colusa Near State Highway 16, six miles northwest of Rumsey. Comment
  CHSC107496  Garrya veatchii Ralph Minto 2010-1-29 1919 Colusa Mendocino National Forest - North Coast Ranges Middle Fork Stony Creek Watershed. Fouts Springs road. 609 Comment
  JEPS80183  Gayophytum humile L. R. Heckard with J. Hickman 1980-7-3 5335 Colusa just w Summit Springs (sw Snow Mt., ca 10 mi w of Stonyford, Colusa-Lake County boundary); Snow Mt. 1548 Comment
  JEPS81279  Geranium carolinianum L. R. Heckard and J. C. Hickman 1982-7-5 5890 Colusa s of (slope below) Summit Springs (s side of Snow Mt.); Snow Mt. 1500 Comment
  UCD103294  Geranium carolinianum Beecher Crampton 1958-5-19 4806 Colusa west of Lodoga, Little Stony Creek Canyon. Comment
  CHSC101434  Geranium dissectum David Isle 2007-5-1 1575 Colusa SE of Maxwell approx. 4 miles in riparian natural area just W of irrigation canal adjacent to 'Lakeland' rice fields farmed by William Dirks and Jack Barrett. W of footbridge S of third landing. 30 Comment
  SBBG61312  Geranium dissectum G. K. Helmkamp with E. A. Helmkamp 2011-4-1 17117 Colusa Maxwell Rd, 2.1 mi E of Maxwell, near Delevan Wildlife Refuge 23 Comment
  UCD164160  Geranium dissectum Craig Thomsen 2000-4-28 2268 Colusa Between Bear Creek and Bear Valley Rd. about 0.3 mile north of junction with Hwy 20. Comment
  UCD57289  Geranium molle Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3660 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
  UC1585898  Gilia capitata subsp. abrotanifolia Barbara Ertter 1989-7-1 8601 Colusa road to Goat Mt. Lookout 2.2 mi s Rt M-10 (Bear Creek-Fouts Spring Rd) (ca 12 mi wsw of Stonyford, sw side of ridge, at head of creek); S. Fk. Stony Creek 1500 Comment
  JEPS121000  Gilia capitata subsp. capitata Lowell Ahart 2013-5-1 18663 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
  UC73637  Gilia clivorum Miss M. Alice King 1905-1 Colusa near College City (Sacramento Valley); , near College City Comment
  CHSC14016  Gilia tricolor G. Notch 1974-3-30 120 Colusa Ca. 0.5 mi w of jct of Hwys 20 and 16. 304 Comment
  HSC45725  Gilia tricolor Patricia Shesgreen 1978-4-22 49 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  RSA293157  Gilia tricolor J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9563 Colusa Bear Valley Road, 2.1 miles from its junction with State Route 20. 366 Comment
  RSA590190  Gilia tricolor Michael A. Vincent, Robert M. Rhode 1996-3-30 7283 Colusa Along Bear Valley Rd. above Bear Creek, 1.4 mi. S jct. Wilbur Springs Rd. Comment
  UCD163665  Gilia tricolor Craig Thomsen 1999-4-15 1965 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCD58115  Gilia tricolor Ellen Dean; PLB 102 Class 2007-4-29 3710 Colusa Payne Ranch. Lands just west of Hwy. 16. About 2 road miles south of junction of Hwy. 20 and Hwy. 16. 308 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
  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
  UCR227904  Gnaphalium palustre Ellen Dean 2008-6-8 5064 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20. Northwest corner of ranch, along ridge trail on the border of Lake and Colusa counties. East side of trail around stock pond 610 Comment
  CHSC115626  Gnaphalium palustre David Isle; Rhonda Isle 2014-9-27 2144 Colusa Northern Sacramento Valley foothills: W Side East Park Reservoir, ~0.3 mi S of boatlaunch, ~100 yds E of normal lake edge in muddy clay soil. (Gilmore Peak California: 10S -0541629E, 4355225N). 353 Comment
  RSA724829  Grindelia camporum L. Ahart 2006-9-26 13345 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 5.5 miles east of Maxwell. 24 Comment
  JEPS113894  Grindelia hirsutula L. P. Janeway 2007-6-17 9058 Colusa Inner North Coast Ranges; Along Bartlett Springs Road between Bear Valley and Walker Ridge Road. 530 Comment
  UC32098  Grindelia hirsutula J. Burtt Davy 1898-5-1 4271 Colusa near Willows Comment
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Sep 15 2014
  CHSC80500  Hainardia cylindrica Caroline Warren; Jenny Marr, Heidi West, Natalie Wight 1998-6-11 Colusa Vicinity of Funks Creek and Logan Ridge. 106 Comment
  CHSC86780  Hainardia cylindrica Jenny Marr; Heidi West, Caroline Warren, Natalie Wight 1998-6-11 Colusa Vicinity of Funks Creek, Logan Ridge, Golden Gate, and Antelope Valley. 121 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
  JEPS94768  Harmonia hallii Vernon Oswald and Lowell Ahart 1998-5-7 9012 Colusa Bartlett Springs Road 2.8 mi w of Bear Valley Road (0.1 mi e of Sawtelle Valley and Grapevine Flat Roads); Bartlett Springs Road 633 Comment
  UCD83665  Helenium Craig Thomsen; G. Harrington 2009-5-12 2859 b Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  CHSC117407  Helenium puberulum B. Castro; Tom Boullion 2009-6-26 1795 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
  JEPS127589  Helenium puberulum B. Castro with Tom Boullion 2009-6-26 1795 Colusa Sacramento Valley. Ca 8 air mi SE of Colusa, via Buster Road off Highway 45, just W of Ogden Bend on W bank of the Sacramento River at RM130.8. Grimes 7.5' Quad. Comment
  UCD70304  Helenium puberulum 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
  UCD64431  Helianthus annuus Craig D. Thomsen 2000-6-23 2428 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
  JEPS110413  Helianthus bolanderi Lowell Ahart 2006-8-9 13097 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford 455 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
  UCD66875  Heliotropium curassavicum Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5078 Colusa BLM Payne Ranch. Lands to the southwest of the intersection of Hwy 16 and Hwy 20. In western part of ranch, several hundred feet downslope of ridge trail. Along trail that starts along ridge bordering Thomspon Creek headwaters and loops back to Ridge trail. Large, dammed stock pond, holding water still in middle of meadow. Comment
  UCD72399  Heliotropium curassavicum Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5124 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Confluence of Cache and Bear Creeks at southern tip of ranch. 198 Comment
  POM64436  Heliotropium curassavicum var. oculatum Roxana Stinchfield 1916-6-17 281 Colusa Near Tule College City. Comment
  CDA20053  Heliotropium europaeum D. Brown 2002-10-4 PDR 019525 Colusa Northern California; Vicinity of Colusa 0 Comment
  JEPS80141  Hemizonella minima L. R. Heckard with J. Hickman 1980-7-2 5301 Colusa trail from Summit Springs to Snow Mt. Peaks (ca 10 mi w of Stonyford, Colusa-Lake County border) 1661 Comment
  CDA15460  Hemizonia congesta subsp. clevelandii G. F. Hrusa, WTD 1998-6-19 14596 Colusa North Coast Ranges; Along Little Stony Creek, on Goat Mtn. Rd. ~ 1/2 km. W of intersection with Lodoga-Stonyford Rd. Comment
  JEPS68350  Hemizonia congesta subsp. clevelandii L. R. Heckard with R. Bacigalupi and B. Doren 1971-9-9 2790 Colusa on Ladoga road about 3 mi s Stonyford 335 Comment
  JEPS83161  Hemizonia congesta subsp. clevelandii L. R. Heckard and J. C. Hickman 1980-9-15 5418 Colusa slopes w Summit Springs; Snow Mt. 1554 Comment
  UC195406  Hemizonia congesta subsp. clevelandii A. A. Heller 1916-6-6 12358 Colusa 3 mi w Leesville (on the grade); Coast Range Comment
  UCD146726  Hemizonia congesta subsp. clevelandii G. F. Hrusa 1998-6-19 14596 Colusa Inner North Coast Ranges. Along Little Stony Creek, on Goat Mountain Road. Around 1/2 km west of intersection with Lodoga-Stonford Road. 400 Comment
  SEINET10797452  Hemizonia congesta subsp. clevelandii Katherine L. Morris, Melvin L. Conrad; David B. Dunn 1973-6-6 Morris 382 Colusa Chaparral woodland and sparse oaks; on Hwy. 20, 0.3 mi. E of Lake County line. Comment
  UC73977  Hemizonia congesta subsp. luzulifolia H. P. Chandler 1905-9-14 Colusa Princeton Comment
  CAS-BOT-BC309737  Hemizonia congesta subsp. luzulifolia A. A. Heller 1939-10-1 15482 Colusa Between Williams and Maxwell Comment
  CDA7037  Hemizonia congesta subsp. luzulifolia T. C. Fuller 1958-5-27 3687 Colusa Highway 20, 0.7 mile west of junction with Hwy 16. 0 Comment
  POM56197  Hemizonia pungens subsp. pungens A. A. Heller 1902-5-19 5572 Colusa Near Colusa. Comment
  JEPS80774  Heracleum lanatum L. R. Heckard and J. C. Hickman 1981-7-30 5747 Colusa s.e. slope Snow Mt. (Trout Creek trail); , Trout Creek trail 1645 Comment
  CHSC79460  Hesperevax acaulis var. acaulis B. Castro; L. P. Janeway 2000-5-2 1107 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 237 Comment
  CHSC79845  Hesperocnide tenella B. Castro; L. P. Janeway 2000-5-4 1129 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 246 Comment
  UCD81735  Hesperocyparis macnabiana Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5737 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
  UCD82529  Hesperolinon Craig Thomsen; G. Harrington 2009-5-12 2885 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. East-facing hillslope above (west border) Eaton Springs meadow complex. 710 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
  CHSC48598  Hesperolinon californicum Vernon Oswald 1986-5-12 2010 Colusa Brim Rd. (Bartlett Springs Rd.) 2.1 mi w of Bear Valley Rd. Common in a grassy opening on a serpentine slope. 487 Comment
  JEPS122888  Hesperolinon californicum Adam C. Schneider with Will Freyman and Yuri P. Springer 2014-5-20 642 Colusa Along north side of Brim Rd east of Indian Valley Reservoir, near Colusa/Lake Co line. Comment
  JEPS94735  Hesperolinon californicum Vernon H. Oswald and Lowell Ahart 1998-7-15 9269 Colusa Bartlett Springs Road 1.6 mi w of Bear Valley Road; Bartlett Springs Road 487 Comment
  UC1212442  Hesperolinon californicum Herbert L. Mason 1946-5-31 12815 Colusa 1 mi e Lake County line (Bartlett Springs to Williams road, western Colusa County); Inner North Coast Ranges 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
  UC1212460  Hesperolinon californicum Helen K. Sharsmith 1953-6-17 4248 Colusa on State Hwy 20 ca 100 ft s origin of Wilbur Springs road; Inner North Coast Ranges, Bear Creek 320 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
  OBI12550  Hesperolinon californicum Herbert L. Mason 1946-5-31 12815 Colusa Inner North Coast Ranges. One mi E of Lake County line, Bartlett Springs to Williams Rd, W Comment
  UC1552829  Hesperolinon californicum Frederica Bowcutt 1985-5-5 511 Colusa nw Wilbur Springs; Big Valley Shale Barrens Comment
  SD51765  Hesperolinon congestum Helen K. Sharsmith 1952-6-21 4159 Colusa North canyon slope overlooking Cooks Springs. 548 Comment
Read comments
Jul 18 2010
  UCD110514  Hesperolinon didymocarpum D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. 370 Comment
  HSC96809  Hesperolinon disjunctum L. Ahart 2006-6-11 12675 Colusa E side of an off road trail (Trail 30), about 100 yards S of Fouts Rd., about 5 mi. W of Stonyford 613 Comment
  UC1212485  Hesperolinon disjunctum Helen K. Sharsmith 1953-6-21 4303 Colusa slopes of Little Stony Creek ca 1 mi within forest boundary; Inner North Coast Ranges, Mendocino National Forest 670 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
  UC1212498  Hesperolinon disjunctum Helen K. Sharsmith 1951-7-13 4033 Colusa on Bartlett Springs road 4.4 mi from Leesville (western margin of county); Inner North Coast Ranges 609 Comment
  UC1212515  Hesperolinon disjunctum Herbert L. Mason 1952-6-19 14301 Colusa slope between Fouts Springs Red Bridge Public Camp; Inner North Coast Ranges, Mendocino National Forest Comment
  UC1601227  Hesperolinon disjunctum Helen K. Sharsmith 1959-5-27 4693 a Colusa Cook Springs Inner North Coast Ranges 548 Comment
  UCD84549  Hesperolinon disjunctum Ellen Dean; C. Thomsen, T. Hansen, and windfarm meeting 2010-6-11 6147 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
  UCR45096  Hesperolinon disjunctum 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
  HSC103533  Hesperolinon disjunctum Thomas W. Nelson, Jane Nelson 1986-5-25 8093 Colusa Along Forest Service Rd. 18N03, just west of Fouts Spring Campground 152 Comment
  OBI12542  Hesperolinon disjunctum Rimo Bacigalupi, G. T. Robbins 1954-6-25 4622 Colusa 0.1 mi E of Lake county line and E of summit of rd from Bear Valley to Indian Valley 640 Comment
  RSA151789  Hesperolinon disjunctum H. K. Sharsmith 1959-5-27 4696 Colusa Colusa County: foot of grade on lower Lake to Williams road, W side Bear Valley. 427 Comment
Read comments
Jan 23 2009
  RSA151821  Hesperolinon disjunctum H. L. Mason 1952-6-19 14301 Colusa Between Fouts Springs and Red Bridge Public Camp, Mendocino National Forest. Comment
  UCD110516  Hesperolinon disjunctum Marilyn Ivey 1973-5-19 55 Colusa 1.5 miles up Wilbur Springs Road north off of State Highway 20. Comment
  UCR71415  Hesperolinon drymarioides H. K. Sharsmith 1965-6-23 5528 Colusa Inner North Coast Ranges, N canyon slope overlooking Cook Springs 549 Comment
  UCD163331  Hesperolinon micranthum Craig D. Thomsen 2009-5-3 2800 Colusa Walker Ridge. Vicinity of Walker Ridge Rd., about 0.5 miles north of Hwy 20. Comment
  UCD83448  Hesperolinon micranthum Craig Thomsen; G. Harrington 2009-5-14 2888 Colusa Colusa County on Walker Ridge: Eaton Springs, about 1 mile east of Walker Ridge Road. 710 Comment
  RSA0069334  Heteranthera dubia Dean W. 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. 36 Comment
  UCR141657  Heteranthera dubia R. Yeo 1976-1 s.n. Colusa 3 mi N of Williams, Glenn-Colusa Canal irrigation district 24 Comment
  CHSC94643  Heterocodon rariflorum Lowell Ahart 2006-6-11 12678 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
  JEPS108816  Heterocodon rariflorum Lowell Ahart 2006-6-11 12678 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
  JEPS86624  Heterocodon rariflorum L. R. Heckard with P. C. Silva, R. L. Moe and M. Moe 1988-6-19 6704 Colusa 0.5 km w Summit Springs (sw flank of Snow Mt, Colusa-Lake County line); Snow Mt. 1500 Comment
  UC2042506  Heteromeles arbutifolia Holly Forbes and Barbara Keller 2011-7-7 Colusa Walker Ridge Rd, 6.1 miles N from its intersection with Hwy 20 Comment
  UCD83759  Heteromeles arbutifolia Ellen Dean; G. Harrington, K. Mawdsley, J. Shepard 2010-5-1 5955 Colusa Colusa County. Walker Ridge. Along Walker Ridge Road, Buck Flat. 875 Comment
  RSA0072452  Heteromeles arbutifolia Michael A. Vincent, Robert M. Rhode 1996-3-30 7296 Colusa Along Brim Rd., 1.9 mi. W jct. Bear Valley Rd. Comment
  JEPS73775  Heuchera micrantha var. pacifica L. R. Heckard 1972-7-10 3126 Colusa 3 mi nw Fouts Springs (on se corner of Snow Mt.); Snow Mt 1828 Comment
  UCSC003615  Heuchera micrantha var. pacifica L. Amidon, C. Rutherford 1975-6-5 45 Colusa In shaded rocks of promontory on southeast corner of Snow Mt. overlooking and 3 miles northwest of Fouts Springs. Snow Mountain. Comment
  UC1192277  Hibiscus lasiocarpos Herbert L. Mason 1945-7-11 12649 Colusa 3 mi above Colusa (plains near Butte Creek, Butte Lodge Outing Club) Comment
  UC931960  Hibiscus lasiocarpos Verne Grant and Alva Grant 1946-8-6 7837 Colusa 1 mi. n. of Butte Outing Gun Club near Colusa (Butte Creek); Butte Creek Comment
  RSA93450  Hibiscus lasiocarpos Milo S. Baker 1946-9-4 11608 Colusa Butte Sink, near gate of Colusa Gun Club Comment
  JEPS73514  Hieracium albiflorum L. R. Heckard 1972-7-10 3132 Colusa 3 mi nw Fouts Springs (near promontory on se corner of Snow Mt.); Snow Mt. 1828 Comment
  RSA0016033  Hippuris vulgaris J. M. Tucker, L. K. Mann 1959-5-30 3528 Colusa Small lake in Mill Valley, ca. 0.25 mile northwest of Lower Letts Valley, and ca. 4 miles, airline, north of Goat Mountain Lookout. 1220 Comment
  UCD163858  Hoita macrostachya Craig D. Thomsen 2001-5-31 2538 Colusa Bear Creek Canyon south of Sulphur Creek confluence. About 3 miles north of Hwy 20. Comment
  UCD164149  Hoita macrostachya Craig Thomsen 1997-6-21 1930 Colusa Bear Valley. About 8 miles north of Hwy 20. Comment
  CAS-BOT-BC320320  Holocarpha virgata Volney Rattan 1884-6-1 s.n. Colusa Stony Creek Colusa. Coast Mts. North of San Francisco Bay 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
  SEINET10758259  Holocarpha virgata subsp. virgata Andrew Townesmith, Karen M. Meyer 2007-8-7 Townesmith 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. T18N R7W. 452 Comment
  UC725605  Holocarpha virgata subsp. virgata A. A. Heller 1940-6-7 15721 Colusa road to Sites; Lodogo Comment
  UCD55458  Holocarpha virgata subsp. virgata Ellen Dean; Gordon Harrington 2006-10-6 3282 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
  UC194239  Holocarpha virgata subsp. virgata H. M. Hall 1916-8-16 10270 Colusa near Arbuckle Comment
  CAS-BOT-BC152577  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
  JEPS121772  Hordeum brachyantherum David Isle 1989-5-14 1995 Colusa COLUSA County, CA. Pendell Ranch ~ 2 miles W of Co. Rd. 306 Jct. w/ Fouts Springs Road. Comment
  CHSC107983  Hordeum brachyantherum subsp. brachyantherum B. Castro; L. Janeway 2011-4-27 1864 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; approximately 1 mi southeast of Funks Reservoir and 800 ft northeast of Tehama-Colusa Canal. Around edges of alkaline flat off northwest corner of large +/- alkaline marsh. 49 Comment
  JEPS81292  Hordeum brachyantherum subsp. californicum L. R. Heckard and J. C. Hickman 1982-7-5 5904 Colusa s side Snow Mountain (slope below (s of) area, Summit Springs); s side Snow Mountain, Summit Springs 1500 Comment
  UCD18841  Hordeum brachyantherum subsp. californicum Vernal Pool Team 2001; Carol Witham and Jennifer Buck 2001-4-30 148 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
  SD225718  Hordeum depressum Carol Witham, Jennifer Buck 2001-4-30 161 Colusa 2 mi. south of the town of Colusa along Hwy 20, east east of Hwy 20 and the Colusa Airpo9rt, Dolan Ranch site, pool # DOL001 Comment
  UCD162991  Hordeum depressum Craig D. Thomsen 2000-4-28 2182 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
  CHSC53989  Hordeum jubatum Vernon H. Oswald 1991-4-21 4526 Colusa Four Mile Rd, 1.9 mi north of Maxwell Colusa Rd. Roadside ditches in area of rice fields. 27 Comment
  CAS-BOT-BC285062  Hordeum marinum subsp. gussoneanum L. R. Abrams 1928-5-8 12593 Colusa 2 miles south of Arbuckle Comment
  CHSC83705  Hordeum marinum subsp. gussoneanum L. P. Janeway 2002-4-24 7520 Colusa Sacramento Valley/Inner North Coast Ranges border. Vicinity of Logan Ridge, Stone Corral Creek, and Funks Creek. 103 Comment
  CHSC110839  Hordeum marinum subsp. gussoneanum David Isle 1989-5-14 1999 Colusa Stony Creek Watershed. Pendell Ranch--2 miles W of Co. Rd. 306 Jct w/ Fouts Ssprings Road. 150 yards south of Pendell home. 384 Comment
  UCR206396  Hordeum murinum George K. Helmkamp, E. A. Helmkamp 2009-3-11 14371 Colusa Inner North Coast Range Foothills, along CA-20, 14.3 miles southwest of Williams 375 Comment
  SEINET241543 Image available Hordeum murinum subsp. glaucum Richard R. Halse 2001-3-22 5946 Colusa Williams 18 Comment
  CHSC83698  Hordeum murinum subsp. leporinum L. P. Janeway 2002-4-24 7521 Colusa Sacramento Valley/Inner North Coast Ranges border. Vicinity of Logan Ridge, Stone Corral Creek, and Funks Creek. 103 Comment
  JEPS80220  Hordeum murinum subsp. leporinum L. R. Heckard and J. Hickman 1980-7-3 5376 Colusa w Summit Springs (sw slope Snow Mountain); sw slope Snow Mountain 1554 Comment
  CHSC83693  Hordeum vulgare L. P. Janeway 2002-4-24 7522 Colusa Sacramento Valley/Inner North Coast Ranges border. Vicinity of Logan Ridge, Stone Corral Creek, and Funks Creek. 103 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
Read comments
Aug 17 2018
  UCD67123  Hosackia oblongifolia Ellen Dean; Davis Botanical Society 2008-5-31 5055 Colusa west of I-5 at Maxwell, north slope of Goat Mountain, along Letts Valley Rd. between Goat Mountain Summit and Fouts Springs. 787 Comment
  UCD67029  Hydrophyllum occidentale Ellen Dean; Davis Botanical Society 2008-5-31 5012 Colusa west of I-5 at Maxwell, Goat Mountain, ridge below summit off of Goat Mountain Road. 1734 Comment
  JEPS82546  Hypericum formosum var. scouleri L. R. Heckard 1983-7-27 6115 Colusa ca. 1/2 mi. w. of Summit Springs (Snow Mt.); Snow Mt. 1470 Comment
  CDA8779  Hypochaeris glabra Richard R. Halse 2007-3-25 7122 Colusa Along State Highway 20, ca. 7.8 miles northeast of its junction with State Highway 16, at base of Salt Canyon. (39.10754 N, 122.30873 W) Comment
  HSC48199  Hypochaeris glabra Thomas W. Nelson, Jane P. Nelson 1978-4-29 3957 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 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
  RSA256676  Iris macrosiphon Maralyn O'Meara, Gary S. Lester 1974-5-4 342 Colusa Walker Ridge Road, ca. 0.7 mile from junction with Little Indian Valley Road 854 Comment
  JEPS80778  Iris missouriensis L. R. Heckard and J. C. Hickman 1981-7-30 5751 Colusa se side Snow Mt. (Trout Creek trail); , Trout Creek 1615 Comment
  CDA19078  Isatis tinctoria R. Breckenridge, Kratville 2001-4-3 PDR 958965 Colusa Sacramento Valley; At junction of I-5 Southbound and Hahn Rd, Williams. 0 Comment
  UCD163714  Iva axillaris Craig Thomsen 1999-5-10 2007 Colusa Colusa County. In canyon between Wilbur Springs Bridge and Bear Valley. About 4 miles north of Hwy 20. Comment
  UCD56938  Iva axillaris Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3540 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Thompson Canyon. 344 Comment
  UCD57305  Iva axillaris Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3676 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
  CHSC32202  Ivesia gordonii James Jokerst 1980-8-8 1076 Colusa North Coast Ranges. Near Snow Mountain (west). Comment
  JEPS106451  Juncus Barrett Anderson 2003-6-19 4875 Colusa Colusa County Airport along Hwy 20 SE of City of Colusa, pond N of the runway. 13 Comment
  CHSC88538  Juncus bufonius var. congestus B. Castro 2003-5-15 1437 Colusa Vicinity of Logan Ridge, Sulphur Gap and Lurline Creek. At edge of stock pond. 196 Comment
  JEPS91291  Juncus bufonius var. occidentalis Dean W. Taylor 1988-3-24 9463 B Colusa Colusa National Wildlife Refuge, on Ohm Road ca. 0.5 miles North of Ware Road 24 Comment
  JEPS80284  Juncus howellii L. R. Heckard, and J. Hickman 1980-9-16 5459 Colusa ne slope West Peak (cirque area between peaks); Snow Mt. 2011 Comment
  JEPS73502  Juncus laccatus L. R. Heckard 1972-7-10 3120 Colusa Trout Creek crossing of trail to Box Springs; Snow Mt. 1828 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
  UCD82125  Juncus patens Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5654 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
  CHSC118858  Juncus phaeocephalus var. paniculatus David Isle; Frank Pendell 2017-5-17 2174 Colusa Footheills E edge of N Coast Range: W of Stonyford ~1.5 miles on 18N01.1 to Frank andsheri Pendell Ranch; in black adobe pasture S of house ~1/8 mile 381 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
  CHSC107157  Juncus xiphioides L. P. Janeway; B. Castro 2011-4-27 10246 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 1.8 km southeast of Funks Reservoir and 0.2 km northeast of Tehama-Colusa Canal. Large +- alkaline vernal pool/marsh; mucky clay soil. Generally lush grassland, almost flat upland around the marsh. 52 Comment
  CHSC111646  Juncus xiphioides David Isle; Justin Isle 1988-5-25 2092 Colusa Mendocino National Forest - North Coast Ranges Middle Fork Stony Creek Watershed. S of Potatoe Hill Rd 17N12 at spring ~1 mile SW of Fouts Springs in the 1987 Fouts Fire secondary fireline rehab. 829 Comment
  CHSC91664  Juncus xiphioides G. D. Barbe; Nola Parmer 1982-6-4 3638 Colusa Sacramento Valley. Along Goat Mountain Road, w of Lodoga-Stonyford Rd., Mendocino National Forest. 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
  CHSC43541  Juniperus californica Lowell Ahart 1976-2-14 1005 Colusa About 3 miles west of Sites. 365 Comment
  CHSC81201  Juniperus californica L. P. Janeway; B. Castro 2001-4-12 7017 Colusa Vicinity of Grapevine Creek, Funks Creek, and Antelope Valley. 158 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
  UCD63024  Juniperus californica Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4676 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Slopes to the northwest of Eula Canyon and west of Cowboy Camp on the west side of Bear Creek. 493 Comment
  CHSC65613  Juniperus occidentalis J. Ingraham 1995-4-13 6 Colusa 1 mi N of Davis Creek on hwy 395, 100 yds. E of junction of Co. Rd. 133B and Hwy 395, 100 yds E. 1487 Comment
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Jul 25 2018
  JEPS73509  Keckiella corymbosa L. R. Heckard 1972-7-10 3127 Colusa 3 mi nw and overlooking Fouts Springs (se corner of Snow Mt); Snow Mt. 1828 Comment
  RSA718197  Keckiella corymbosa L. Ahart 2006-8-9 13102 Colusa On the south side of Stony Creek, at Mine Camp, about 3.5 miles (air) west of Stonyford. 422 Comment
  UCD72539  Keckiella lemmonii Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3830 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. East side of Bear Creek, just south of BLM parking lot (ca. 10 miles). 252 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
  UC637057  Kickxia elatine Edward Lee 1934-8-9 1011 Colusa 4 mi n Willows; Sacramento Valley Comment
  UCR261653  Koeleria gerardi Ann Howald 2003-4-24 2321 Colusa Inner North Coast Ranges, Indian Valley, west side of East Park Reservoir, spillway overlook 368 Comment
  SEINET7075566  Koeleria macrantha 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
  CAS-BOT-BC123283  Krynitzkia rostellata M. K. Curran 1884-5-1 s.n. Colusa Leesville (wrote Leesburg, Lake(?) Co. on label; later corrected to Leesville Comment
  CHSC107936  Lactuca saligna B. Castro; L. Janeway 2011-7-9 1892 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; approximately 1 mi southeast of Funks Reservoir and 0.25 mi northeast of Tehama-Colusa Canal. In N end of swale about 700 ft north of large +- alkaline marsh. 49 Comment
  CHSC80155  Lactuca saligna B. Castro; G. Kuenster 2000-7-19 1211 Colusa Vicinity of Maxwell, Funks Creek, and the Glenn-Colusa canal, on low flat terrace beside S edge of shallow intermittent stream channel draining eastward out of the hills east of Golden Gate. 39 Comment
  JEPS80852  Lactuca saligna L. R. Heckard and J. Hickman 1980-9-15 5432 A Colusa n of Summit Springs (n side of road; Lake-Colusa County boundary); Snow Mt. 1524 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
  CAS-BOT-BC340495  Lactuca serriola Roxana Stinchfield 1916-7-11 477 Colusa Sycamore Slough road Comment
  CHSC94692  Lagophylla minor Lowell Ahart 2006-6-11 12667 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
  HSC96892  Lagophylla minor L. Ahart 2006-6-11 12667 Colusa E side of an off road trail (Trail 30), about 100 yards S of Fouts Rd., about 5 mi. W of Stonyford 613 Comment
  JEPS110184  Lagophylla minor Lowell Ahart 2006-6-11 12667 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
  JEPS121113  Lagophylla minor Lowell Ahart 2013-5-1 18680 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
  UC638652  Lagophylla minor Ethel Crum 1938-5-8 2033 Colusa 3 mi n Leesville; Inner North Coast Range Comment
  UCD82519  Lagophylla minor Craig Thomsen; G. Harrington 2009-5-12 2876 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 713 Comment
  JEPS38990  Lagophylla minor W. L. Jepson 1938-6-9 18959 Colusa mts. betw. Indian Valley (Lake Co.) and Bear Valley (Colusa Co.) 579 Comment
  JEPS81971  Lagophylla minor Rimo Bacigalupi, T. Crovello, and L. Heckard 1965-4-26 9046 Colusa on road to Bartlett Springs 2 mi from Ladoga junction (summit w of Bear Valley, Colusa-Lake County boundary) 670 Comment
  CAS-BOT-BC341470  Lagophylla ramosissima L. R. Abrams 1928-5-8 12586 Colusa 2 miles south of Arbuckle Comment
  UCR206691  Lamium amplexicaule George K. Helmkamp, E. A. Helmkamp 2009-1-31 14323 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
  HSC72162  Lasthenia californica J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9537 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  UCD23380  Lasthenia californica subsp. californica George C. Ziobro 1978-4-8 2 Colusa collected off of Bear Valley Road 10.3 miles north of the junction with State Route 20. 396 Comment
  UCD18839  Lasthenia fremontii Vernal Pool Team 2001; Carol Witham and Jennifer Buck 2001-4-30 146 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
  HSC83436  Lasthenia glaberrima J. M. Tucker 1978-5-6 4408 Colusa W side of Ber Valley Rd., 11 mi N of jct with State Hwy 20 366 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
  CHSC29752  Lasthenia glabrata K. R. Stern 1980-4-1 6619 Colusa Vernal pool, south border area of Delevan National Wildlife Refuge. 48 Comment
  HSC60475  Lasthenia glabrata J. P. Smith 1977-4-24 9041 Colusa Along Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  CAS-BOT-BC328107  Lasthenia glabrata subsp. coulteri Roxana S. Ferris 1926-4-22 6288 Colusa Tule land 3 miles W of Colusa Comment
  CHSC53934  Lasthenia glabrata subsp. glabrata Vernon H. Oswald 1991-4-21 4520 Colusa Bear Valley Rd in Bear Valley, 1.0 mi south of Brim Rd (Bartlett Springs Rd), west of Williams. Roadside. 417 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
  UCR212333  Lasthenia glabrata subsp. glabrata Craig D. Thomsen 2000-3-31 2046 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
  UC71630  Lasthenia gracilis Miss Alice King 1905-1-1 Colusa College City Comment
  UCD132538  Lasthenia gracilis Beecher Crampton 1958-4-21 9169 Colusa 3.5 miles N.W. of Lodoga by road. Comment
  UCD15423  Lasthenia gracilis Margit Sands 1985-4-13 26 Colusa in Bear Valley, 3.8 miles north of Wilbur Hot Springs rd.; 390 Comment
  UCD163909  Lasthenia gracilis Sara Martin 2016-4-9 2 Colusa BLM Bear Creek Ranch (Previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. Just southwest of corral at junction of 16 and 20. 323 Comment
  UCD33938  Lasthenia gracilis Beecher Crampton 1958-4-21 9169 Colusa Colusa County, 3.5 miles N.W. of Lodoga by road. Comment
  UCD67932  Lasthenia gracilis Greg Vita 1978-4-7 1 Colusa Bear Valley, 10.3 mi. N. of State Route 20. Open grassland with full sun. 396 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
  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
  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
  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
  CHSC82611  Layia chrysanthemoides Tara Morgan 2002-4-6 16 Colusa Found in Bear Valley located west of Highway 5 and north of Highway 20 within pastures. 385 Comment
  HSC86895  Layia chrysanthemoides Anthony J. Desch, Bryon Cariss 1988-4-17 39 Colusa 1.3 mi. S on Bear Valley Rd. from the corner of Brim Rd. and Bear Valley Rd. Comment
  RSA424743  Layia chrysanthemoides Aaron Liston, M. Blumler 1987-4-26 667 -5 Colusa Bear Valley - Lodoga Road, 6.6 miles S of Bartlett Springs Jct. Comment
  UC638649  Layia chrysanthemoides Ethel Crum 1938-5-8 2037 Colusa four mi s of Leesville; Bear Valley 426 Comment
  UCD163702  Layia chrysanthemoides Craig Thomsen 1999-5-10 2014 Colusa Bear Valley. About 9 miles north of Hwy 20. Comment
  CHSC27853  Layia fremontii Phil Blumert 1978-3-28 16 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
  CHSC27623  Layia platyglossa Timothy Spira; Robert Schlising 1978-5-13 3249 Colusa Bear Valley, about 5 mi S of Leesville, on Bear Valley (= Wilber Springs) Road. Field. Comment
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May 24 2013
  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
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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
  UCD163306  Layia platyglossa Craig D. Thomsen 1997-4-20 1909 Colusa Bear Valley. About 5 miles north of Hwy 20. Comment
  CDA8151  Layia platyglossa P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  CHSC62838  Layia septentrionalis Vernon H. Oswald; Lowell Ahart 1994-3-23 6020 Colusa Goat Mtn. Rd. just W of the bridge over Sullivan Creek, S of Stonyford. Between the road and Little Stony Creek. 505 Comment
  JEPS13436  Layia septentrionalis R. F. Hoover 1938-4-24 3213 Colusa Upper Sand Creek Comment
  UC75946  Layia septentrionalis Miss M. Alice King 1905-1-1 Colusa near College City Comment
  UC761877  Layia septentrionalis R. F. Hoover 1938-4-24 3213 Colusa Upper Sand Creek Comment
  CAS-BOT-BC527263  Lemna gibba A. A. Heller; H. E. Brown 1902-5-19 5571 Colusa Near Colusa Comment
  CAS-BOT-BC527264  Lemna gibba A. A. Heller; H. E. Brown 1902-5-19 5571 Colusa Near Colusa Comment
  CHSC116673  Lemna minuta Lowell Ahart; John Dittes, Josephine Guardino 2016-2-14 20723 Colusa Small pond on the east side of the graveel road, about 1/2 mile north of Letts Lake, about 1/2 mile south of the large campground, about 13 miles (air) southwest of Stonyford. 966 Comment
  UCD138139  Lemna minuta Herbert L. Mason; Verne Grant 1946-8-6 12966 Colusa on Colusa-Marysville Highway, four miles south of Colusa, west side of Sacramento River. Comment
  CHSC46882  Lemna trisulca Vernon Oswald 1989-9-12 4005 Colusa Lily Pond near Letts Lake in the Mendocino National Forest, ca. 10 mi (air) sw of Stonyford. In pool at the outlet of the 'Lily Pond. 1341 Comment
  CAS-BOT-BC527300  Lemna trisulca C. Ritchie Bell 1951-6-13 1167 Colusa Below Letts Meadow on road from Bear Creek to Foutes Spring 914 Comment
  UC1101262  Lemna trisulca C. Richie Bell 1951-6-13 1167 Colusa just below Letts Meadow (on road from Bear Creek to Foutes Spring) 914 Comment
  UC1101274  Lemna turionifera Herbert L. Mason, Verne Grant 1946-8-6 12966 Colusa 4 mi s of Colusa (w side of Sacramento River, on Colusa-Marysville Highway); Sacramento River Comment
  JEPS95512  Lepidium dictyotum var. dictyotum Vernon H. Oswald and L. Ahart 1994-4-6 6074 Colusa T16N R7W SW1/4 Sec. 11, 1800 ft, Chaparral. Goat Mtn. Rd. 0.3 mi S of Little Stony Creek Bridge, SW of Digger Pine Flat, SSW of Stonyford 548 Comment
  CAS-BOT-BC89761  Lepidium latipes Brandegee s.n. Colusa Unspecified. Comment
  CHSC112923  Lepidium latipes var. latipes B. Castro; L. Janeway, Robin Carter 2010-3-23 1802 Colusa Vicinity of Golden Gate in Logan Ridge, Funks Reservoir, and the Tehama-Colusa canal, in disturbed, grazed annual grassland. 120 Comment
  CHSC79001  Lepidium latipes var. latipes J. Marr; C. Warren, H. West, N. Wight, et al 1998-4-14 Colusa West of Maxwell, vicinity of Antelope Valley and Grapevine/Funks Creeks. 121 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
  RSA799180  Lepidium strictum George K. Helmkamp, E. A. Helmkamp 2011-4-1 17134 Colusa Eastern foothills North Coast Ranges: Antelope Valley, along Maxwell-Sites Road, 2.0 mi southeast of Sites. 85 Comment
  UC767153  Leptochloa fascicularis R. F. Hoover 1936-7-31 1590 Colusa Maxwell Comment
  UCD63675  Leptochloa fusca subsp. fascicularis Elizabeth Wilson 1940-1 Colusa Colusa. Comment
  CAS-BOT-BC273929  Leptochloa fusca subsp. fascicularis James Moffett 1928-10-1 s.n. Colusa 5 miles north of Colusa Comment
  CAS-BOT-BC273930  Leptochloa fusca subsp. fascicularis Milo S. Baker 1944-7-18 10868 Colusa Several miles W. of Williams along Highway to Lake Co. Comment
  JEPS15570  Leptodactylon pungens G. Thomas Robbins with L. R. Heckard 1956-7-25 3710 Colusa above Dark Hollow Creek (a trib. of Middle Fork Stony Creek, s flank of Snow Mt. East, at lower edge of cirque between Snow Mt. Wsst and Snow Mt. East); Snow Mt. East, Dark Hollow Creek (trib. Middle Fork Stony Cr 1981 Comment
  HSC94027  Leptosiphon androsaceus A. Skelly, G. McCabe, B. Bletcher 1996-3-30 3 Colusa .9 mi. N of Walker Springs Rd. and Indian reservoir Rd. jct. on Walker Ridge Rd., 57 mi. E of Hwy. 101 on Hwy. 20 777 Comment
  UCD64434  Leptosiphon bicolor Craig D. Thomsen 2001-4-12 2460 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
  UCD55171  Leptosiphon bolanderi Kim E. Steiner 1978-4-29 202 Colusa Walker Ridge Road; 1.5 miles N of State Hwy 20. 777 Comment
  CHSC40735  Leptosiphon ciliatus L. Constance 1938-4-22 2149 Colusa Above Salt Creek, Lower Lake-Williams road 11 mi. NE. of Lake-Colusa line, Inner North Coast Ranges. 152 Comment
  HSC85809  Leptosiphon ciliatus Sandy Floyd, Tom Munton, T'ai Roulston 1987-4-12 95 Colusa Leesville Rd. 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
  RSA232952  Leptosiphon ciliatus D. A. Young 1969-5-4 P- 325 Colusa Approx. 10 mi W. of Wilbur Springs along Hwy 16. 610 Comment
  UCD163234  Leptosiphon parviflorus Craig D. Thomsen 2001-4-12 2440 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
  UCD81216  Leptosiphon parviflorus Ellen Dean; K. Mawdsley, B. Rice, G. Harrington, and J. Alderson 2009-5-6 5553 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
  CHSC91040  Lesquerella occidentalis subsp. occidentalis D. Isle 2003-6-24 376 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
  UCD163716  Lessingia Craig Thomsen 1999-5-10 2008 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCD70252  Lessingia micradenia D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley. Destanella Flat-Walker Ridge. 450 Comment
  CAS-BOT-BC341799  Lessingia nemaclada T. S. Brandegee 1884-1-1 s.n. Colusa Mountain House Comment
  CHSC77543  Lessingia nemaclada Heidi West; Caroline Warren 1998-5-26 Colusa Vicinity of Antelope Valley, Huffmaster Road, and Sites. 152 Comment
  UCD66691  Lessingia nemaclada Craig D. Thomsen 2000-6-23 2372 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
  JEPS94888  Lessingia ramulosa Vernon H. Oswald and Lowell Ahart 1998-7-15 9276 Colusa w side of county on Sawtelle Valley Road 0.4 mi n of Bartlett Springs Road; Sawtelle Valley Road 670 Comment
  UCD58177  Lessingia ramulosa Gordon Harrington 2007-5-31 68 Colusa BLM Payne Ranch. Lands to the SW of the intersection of Hwy 16 and Hwy 20. Along Thompson Creek, approximately 3/4 mile downstream from Road Kill Cafe. 357 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
  SEINET11810787  Lessingia ramulosa C. L. Abbott 1926-1 s.n. Colusa Colusa Comment
  UCD134101  Lessingia ramulosa Vernon H. Oswald; Lowell Ahart 1998-7-15 9276 Colusa west side of county on Sawtelle Valley Road 0.4 mile north of Bartlett Springs Road. 670 Comment
  HSC31308  Lewisia rediviva Carter Schleicher 1974-5-4 25 Colusa 0.75 mi. from T junction of Walker Ridge Rd. and Indian Valley, near Clyde Mine 854 Comment
  JEPS43214  Lewisia rediviva W. L. Jepson 1932-5-7 16280 Colusa Lodoga 457 Comment
  UCD56681  Lewisia rediviva Roger Willmarth 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
  UCD81857  Lewisia rediviva Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5741 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
  HSC49866  Lewisia rediviva J. P. Smith, J. O. Sawyer 1978-4-29 9779 Colusa Lake/Colusa County Line; Walker Ridge Rd., 4.8 mi. N from the T-intersection to Indian Valley Reservoir Comment
  UC1736070  Lewisia rediviva var. rediviva Dean W. Taylor 1993-3-18 13310 Colusa East Park Reservoir, on stony hillsides ca. 0.4 miles due west from spillway into Little Stony Creek, 411 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
  CHSC49659  Lilium pardalinum subsp. pardalinum Vernon Oswald 1986-6-30 2173 Colusa Fouts Springs Rd. (M10) 14.5 mi w of Rd. 306, 0.5 mi ne of jct. Letts Lake Rd, 17N02. 1219 Comment
  CDA34116  Limnanthes alba P. Hiatt 1979-4-26 7 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  UCR118966  Limnanthes douglasii subsp. nivea Beecher Crampton 1975-4-21 9167 Colusa Inner North Coast Ranges, Mendocino National Forest, 1 mile west of Lodoga 396 Comment
  SEINET8729331 Image available Linanthus bakeri Herbert L. Mason 1941-1 12404 Colusa Three miles south of Stonyford. Comment
  SEINET7096751  Linanthus ciliatus A. G. Vestal 1955-4-5 s.n. Colusa Along Route 16 about 0.2 miles south of Route 20 and near Bear Creek. NAD27, 39? deg. 00' 36ao, -122?_ 21' 22ao (converted to WGS84 decimal degrees) Comment
  UC73621  Linanthus ciliatus Miss Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  UCD118534  Linanthus dichotomus Beecher Crampton 1958-4-21 9172 Colusa 4 miles NW of Lodoga (by road). Comment
  UC125228  Linanthus filipes Katharine Brandegee Apr 1889 Colusa Leesville Comment
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Aug 28 2012
  UC618381  Linanthus parviflorus Alice Eastwood and John Thomas Howell 1938-5-16 5630 Colusa Lake-Colusa county line, on road to Williams Comment
  CDA40096  Linanthus parviflorus Vernon H. Oswald & Lowell Ahart 1998-5-7 9006 .1 Colusa Bartlett Springs Road 2.1 miles west of Bear Valley Road, 0.8 mile east of Sawtelle Valley and Grapevine Flat roads. Comment
  JEPS39670  Linanthus parviflorus Rimo Bacigalupi, and T. Crovello, and L. Heckard 1965-4-26 9047 Colusa 2.5 mi from Ladoga junction (at summit w of Bear Valley on road to Bartlett Springs, Colusa-Lake County boundary) 670 Comment
  UCD163884  Lithophragma affine Craig D. Thomsen 2002-4-10 2596 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 0.75 mile west of Hwy 20/16 instersection. Comment
  CDA34090  Lithophragma affine P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  CAS-BOT-BC432295  Lithophragma campanulatum Helen K. Sharsmith 1953-7-1 4403 Colusa above Linger Longer Camp, Goat Mountain, Mendocino National Forest 1615 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
  HSC72155  Lithophragma parviflorum J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9568 Colusa Bear Valley Rd., 2.1 mi. from its junction with Hwy. 20 366 Comment
  CHSC107938  Logfia filaginoides B. Castro; Joe Silveira, Tom Boullion 2011-6-10 1887 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; ca 5 air mi NW of Maxwell, 1 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
  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
  CAS-BOT-BC269050  Lolium perenne Roxana Stinchfield 1916-6-17 491 Colusa Road to Tule near College City 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
  CHSC42597  Lomatium californicum Vernon Oswald 1986-6-4 2080 Colusa M10, 0.2 mi w of its jct. with M5. 609 Comment
  UCD80835  Lomatium californicum Ellen Dean; G. Harrington, J. Alderson, M. Bibbo, B. Rice 2009-3-25 5292 Colusa BLM Bear Creek (Payne) Ranch, lands to the SW of the jct of Hwys 16 and 20. South side of canyon that is located to the north of Brophy Canyon. 274 Comment
  UCD127607  Lomatium californicum D. Sanchez-Mata 1998-7-10 s.n. Colusa Stonyford. Fouts Springs Road. 640 Comment
  HSC60362  Lomatium ciliolatum var. hooveri Phyllis Krieg 1979-4-14 Colusa 1067 Comment
  UCR261661  Lomatium dasycarpum Ann Howald 2003-5-5 2330 Colusa Inner North Coast Ranges, Goat Mountain Road, c. 0.25 mile west of intersection with Lodoga-Stonyford Road 394 Comment
  UCD127631  Lomatium dasycarpum Kim E. Steiner 1978-4-29 197 Colusa southwest-facing slope, Walker Ridge Road; 1.5 miles N of State Hwy 20. 777 Comment
  CHSC42602  Lomatium hooveri Vernon Oswald 1986-5-12 2005 Colusa Brim Rd. (Bartlett Springs Rd.) 1.5 mi w of Bear Valley Rd. 441 Comment
  UC1073298  Lomatium hooveri George B. Rossbach 1955-4-9 374 Colusa on Route 20 w. edge Colusa Co. 563 Comment
  UC765513  Lomatium hooveri R. F. Hoover 1941-5-2 4987 Colusa just e. Lake Co. line (on Williams-Clear Lake hwy.) Comment
  UCD163312  Lomatium hooveri Craig D. Thomsen 1997-4-18 1901 Colusa Bear Valley. About 6 miles north of Hwy 20. Vicinity of Trout Creek, north of Deadshot Canyon. 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
  SEINET8693961  Lomatium macrocarpum R. R. Halse 2014-3-25 9033 Colusa Along the Leesville-Logoda Road ca. 5.6 mi S of Logoda; Indian Valley. 425 Comment
  UCD127696  Lomatium macrocarpum G. L. Stebbins Jr. 1962-5-6 6025 Colusa along Highway No. 20, Bear Creek, between Williams and Lower Lake, south of Wilbur Springs. 457 Comment
  UCD163700  Lomatium macrocarpum Craig Thomsen 1999-5-10 2009 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  JEPS80091  Lomatium macrocarpum L. R. Heckard with J. Hickman 1979-6-16 5099 Colusa n. of meadow just w. of West Peak Snow Mt. 1965 Comment
  CDA33696  Lomatium marginatum P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  CHSC77720  Lomatium marginatum var. purpureum B. Castro; M. A. Griggs, L. P. Janeway, B. Hendrickson 1999-4-12 875 Colusa About 8 miles NW of Maxwell, vicinity of Peterson Rd and Logan Ridge. 134 Comment
  UC763095  Lomatium marginatum var. purpureum R. F. Hoover 1938-4-24 3214 Colusa foothills w. Arbuckle (Sand Creek); Sand Creek Comment
  UCD67095  Lomatium triternatum Ellen Dean; Davis Botanical Society 2008-5-31 5024 Colusa west of I-5 at Maxwell, Goat Mountain, ridge below summit off of Goat Mountain Road. 1734 Comment
  JEPS16221  Lomatium utriculatum Rimo Bacigalupi and Arthur Holmgren 1950-4-25 3177 Colusa 10 mi. n.w. Sites (Grapevine Grade to Lodoga) Comment
  UC875215  Lomatium utriculatum Lewis S. Rose 1936-4-27 36180 Colusa 11 mi. n.w. Rumsey Comment
  UCD163680  Lomatium utriculatum Craig Thomsen 1999-4-15 1981 Colusa Bear Valley. About 5 miles north of Hwy 20, west of Bear Valley Rd. 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
  UCD40910  Lomatium utriculatum Kathi A. Zurakowski 1984-5-21 s.n. Colusa Bear Valley. 3.2 miles north of turnoff to Wilbur Springs. In field, west of road. 381 Comment
  RSA0010483  Lomatium vaginatum Richard R. Halse 2014-3-25 9028 Colusa Along the Sites-Logoda Road ca. 5.2 miles northwest of Sites. 175 Comment
  SEINET7408261 Image available Lomatium vaginatum Richard R. Halse 2014-1 9028 Colusa Along the Sites-Logoda Road ca. 5.2 miles northwest of Sites 175 Comment
  UCD66539  Lonicera interrupta Craig D. Thomsen 2001-5-24 2516 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
  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
  JEPS108723  Lotus corniculatus Lowell Ahart 2006-8-9 13129 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  UCD57469  Lotus corniculatus Ellen Dean; W. Murray, J. Alderson, B. Weiss, M. Starbuck 2007-4-7 3682 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. Thompson Canyon, north side of trail adjacent to creek. 362 Comment
  UCR228657  Lotus crassifolius Ellen Dean, Davis Botanical Society 2008-5-31 5004 Colusa West of Hwy I-5 at Maxwell, east slope of Goat Mountain along Goat Mountain Road 1152 Comment
  JEPS83028  Lotus grandiflorus var. grandiflorus L. R. Heckard 1969-5-28 2236 Colusa about 5 mi w Stonyford (along Trough Spring Ridge road 0.5 mi sw of its junction with the Stonyford-Fouts Spring road); Trough Spring Ridge 731 Comment
  UCR71533  Lotus grandiflorus var. mutabilis L. R. Heckard 1969-5-28 2263 Colusa Along Trough Spring Ridge road 1/2 mi. SW of junction with theStonyford-Fouts Spring road (c. 5 mi. west of Stonyford). 732 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
  UCR225395  Lotus scoparius Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5113 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 551 Comment
  CHSC33400  Lupinus Rene T. Retuta 1978-4-4 8 Colusa Ca. 0.3 mi w of jct. of Hwys. 20 and 16, s side of Bear Creek, ca 18 mi. sw of Williams. 579 Comment
  UC71651  Lupinus affinis Miss Alice King 1905-1 Colusa College City Comment
  HSC89790  Lupinus albifrons L. Blackford, S. Branch, D. Malm 1988-4-16 71 Colusa 15.3 mi. off Hwy. 20 on Walker Ridge Rd. 915 Comment
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Aug 20 2014
  HSC91367  Lupinus albifrons A. Smith, A. Eller, B. Hoffman 1989-4-15 23 Colusa 3 mi. SW of Digger Pine Campground, on Goat Mtn. Rd. 152 Comment
  CAS-BOT-BC196036  Lupinus albifrons var. collinus A. Burgard; J. Goldsmith; J. Kalt 1996-5-4 78 Colusa 2.4 miles west of Bear Valley Rd. 12.4 miles on Walker Ridge Rd. from Hwy 20 to Brim Rd. 57 miles east of Hwy. 101 on Hwy. 20 524 Comment
  CDA15481  Lupinus albifrons var. collinus G. F. Hrusa, WTD 1998-6-19 14618 Colusa North Coast Ranges; Along USFS Pacific Ridge Rd. (M5) above intersection with Goat Mtn. Rd. 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
  UCR224884  Lupinus albifrons var. collinus Ellen Dean, Gordon Harrington, Kate F. Mawdsley, Jean V. Shepard 2010-5-1 5945 A Colusa Walker Ridge, along Walker Ridge Road at intersection with road to Eaton Springs, east side of road 927 Comment
  CHSC27856  Lupinus bicolor Phil Blumert 1978-3-28 18 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
  HSC44466  Lupinus bicolor R. York 1978-4-22 138 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 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
  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
  UCD15277  Lupinus bicolor Claire Warshaw 1985-4-13 21 Colusa along Bear Valley Road, 45 miles northwest of intersection with Highway 22. 420 Comment
  POM163463  Lupinus densiflorus var. aureus Roxana S. Ferris 1926-4-23 6415 Colusa At Mountain House on the Williams-Stonyford Road. Comment
  NY15886  Lupinus formosus var. robustus A. A. Heller 1902-5-20 5573 Colusa Near College City Comment
  UCD107778  Lupinus formosus var. robustus D. E. Breedlove 1963-4-20 4624 Colusa 11 miles W of Arbuckle on the Rumsey-Arbuckle Road. Comment
  CHSC30054  Lupinus microcarpus var. densiflorus D. Greenstein 1977-4-11 12 Colusa Salt canyon n side of Salt Creek, Hwy 20, 10 mi wsw of Williams. Comment
  CHSC71113  Lupinus microcarpus var. densiflorus Jan Monelo 1989-4-1 7 Colusa In hillside spanning Hwy 20. Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. 143 Comment
  UC1053479  Lupinus microcarpus var. densiflorus Rimo Bacigalupi, Arthur Holmgren 1950-4-26 3176 Colusa 10 mi nw Sites (Grapevine Grade to Lodoga); Grapevine Grade to Lodoga Comment
  UC1234601  Lupinus microcarpus var. densiflorus Peter H. Raven 1962-5-31 17910 Colusa State Highway 20, 2.5 mi e Lake County line Comment
  UCD163886  Lupinus microcarpus var. densiflorus Craig D. Thomsen 2002-4-26 2600 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 0.75 mile west of Hwy 20/16 instersection. Comment
  JEPS108050  Lupinus microcarpus var. densiflorus Rhonda Riggins 1982-5-30 1448 Colusa Roadside Ladoga-Leesville Road, 4.4 mi N Leesville. 457 Comment
  OBI56805  Lupinus microcarpus var. densiflorus Rhonda Riggins 1982-5-30 1448 Colusa Roadside Ladoga-Leesville Rd, 4.4 mi N Leesville 457 Comment
  RSA659209  Lupinus microcarpus var. densiflorus R. Riggins 1982-5-30 1448 Colusa Roadside Ladoga-Leesville Rd., 4.4 mi N Leesville. 457 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
  CHSC938  Lupinus microcarpus var. microcarpus V. Holt 1946-4-18 Colusa Cache Creek. 365 Comment
  UCD108845  Lupinus microcarpus var. microcarpus A. A. Heller 1919-5-10 13114 Colusa Valley west of Leesville. Comment
  UCD33935  Lupinus nanus Beecher Crampton 1958-4-21 9166 Colusa 1 mile west of Lodoga. Comment
  RSA424766  Lupinus nanus var. apricus Aaron Liston, M. Blumler 1987-4-26 667 -9 Colusa Bear Valley - Lodoga Road, 6.6 miles S of Bartlett Springs Jct. Comment
  HSC45734  Lupinus polycarpus M. Alcasas 1978-4-22 39 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  HSC89693  Lupinus succulentus William E. Avery, Mathew Henry Bergvall-Mensor, Steve Wilson 1989-4-15 Colusa Walker Ridge Rd., 3 mi. W of Bear Valley Rd. 457 Comment
  POM276532  Lupinus succulentus Lyman D. Benson 1935-3-27 6336 Colusa 2 mi W of Williams. Inner N Coast mtn range, Sacramento River watershed. 122 Comment
  RSA276282  Lupinus vallicola subsp. apricus Lyman D. Benson 1935-3-27 6333 Colusa 2 mi W of Williams. Inner N Coast mtn range, Sacramento River watershed. 122 Comment
  CAS-BOT-BC441312  Luzula subsessilis F. P. Cronemiller 1924-5-12 876 Colusa Lower Letts Valley 1249 Comment
  CDA37495  Lythrum californicum D. Brown 1977-5-31 s.n. Colusa Near Williams. 0 Comment
  CDA34965  Lythrum tribracteatum Barbara Ertter, Elizabeth Neese, Laura Fujii, Dawn Espindola 1989-10-21 8870 Colusa Southeast end of East Park Reservoir, north of Lodoga. Comment
  CHSC94480  Lythrum tribracteatum Lowell Ahart 2006-8-9 13162 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UCD67069  Lythrum tribracteatum Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5097 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
  JEPS117019  Lythrum tribracteatum David Gowen 2008-5-24 925 Colusa West of Sites on north side of road. Comment
  UCD58118  Madia Ellen Dean; PLB 102 Class 2007-4-29 3713 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
  UC638653  Madia citriodora Ethel Crum 1938-5-8 2031 Colusa 3 mi n Leesville 426 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
  CHSC94320  Madia elegans subsp. densifolia Lowell Ahart 2006-8-9 13095 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  RSA718046  Madia elegans subsp. densifolia L. Ahart 2006-8-9 13095 Colusa On the south side of Stony Ceek, at Mine Camp, about 3.5 miles (air) west of Stonyford. 455 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
  CHSC101645  Madia gracilis David W. Isle 2003-5-15 1630 Colusa Mendocino National Forest; about 6 mi. W of Stonyford; N aspect serpentine chaparral slope S of (M-10) (18N01.2) and just W of OHV Trail 30 (18N78) jct. On August 8, 2001 Trough Fire Burn Site. MDB and M. 585 Comment
  CHSC89612  Madia gracilis B. Castro; Aric Lester, Shirley Innecken 2004-4-12 1446 Colusa Vicinity of Antelope Valley, Huffmaster Road, and headwaters of Lurline Creek. Near bottom of secluded E-W trending side-canyon. 167 Comment
  JEPS80755  Madia gracilis L. R. Heckard and J. C. Hickman 1981-7-29 5722 Colusa spur about 1 km se Summit Springs (s side of mountain); Snow Mt. 1554 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
  CDA8257  Madia hallii Vernon H. Oswald & Lowell Ahart 1998-5-7 9012 Colusa Bartlett Springs Road 2.8 miles west of Bear Valley Road, 0.1 mile east of Sawtelle Valley and Grapevine Flat Roads. Comment
  UCD159852  Madia hallii G. Ledyard Stebbins 1985-4-19 C 503 Colusa South end of Walker Ridge, along Walker Ridge Road, 0.25 miles northeast of its junction with road to Indian Valley Dam. (Note by label-maker: Section 12 is farther than 0.25 miles NE of road to Indian Valley Dam. Georeferenced this record in Section 13). Comment
  RSA141307  Madia minima J. M. Tucker 1959-5-30 3520 Colusa Ca. 2 miles (by road) below the summit of Goat Mountain (ca. 1.25 miles, airline, north-northwest of Goat Mountain Lookout) 1646 Comment
  UCD66442  Madia sativa Craig D. Thomsen 2000-4-28 2191 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
  RSA262347  Maianthemum stellatum J. M. Tucker, L. K. Mann 1959-5-30 3529 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
  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
  JEPS121749  Malacothamnus fremontii David Isle, Ronda Isle 2013-6-23 2044 Colusa COLUSA County, CA. Just E of Maxwell Grade Summit and pass; hot burned S aspect slope N of Sites Lodoga Road. (At Grapevine Pass). Comment
  UCR201715  Malacothrix Ken Osborne 2005-4-24 s.n. Colusa North Coast Range, Stony Creek, along Goat Mountain Rd. 413 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
  CHSC79469  Malacothrix clevelandii B. Castro; L. P. Janeway 2000-5-2 1116 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 249 Comment
  JEPS36621  Malacothrix clevelandii R. F. Hoover 1938-4-24 3212 Colusa Upper Sand Creek Comment
  JEPS16207  Malacothrix floccifera Rimo Bacigalupi and Arthur Holmgren 1950-4-26 3185 Colusa just w Bear Valley (just w of base of the grade to Indian Valley (Bartlett Mt. Grade)); Inner North Coast Ranges Comment
  UC1053472  Malacothrix floccifera Rimo Bacigalupi and Arthur Holmgren 1950-4-26 3185 Colusa just w Bear Valley (just w of base of the grade to Indian Valley (Bartlett Mt. Road)); Inner North Coast Ranges Comment
  UC1174491  Malacothrix floccifera Volney Rattan 1884-1 Colusa Comment
  UC18727  Malva nicaeensis J. Burtt Davy May, 1898 4276 Colusa near Willows Comment
  SEINET7096534  Malva parviflora Richard R. Halse 2001-3-22 5945 Colusa Williams; along a vacant lot by 455 - 4th street Weedy roadside; 39 9.52N 122 8.84W (Converted to decimal degrees). Elevation 18 m. 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
  CHSC86831  Malvella leprosa Jenny Marr; Heidi West, Caroline Warren 1998-7-1 Colusa Vicinity of Sites, Golden Gate, Stone Corral Creek, and Funks Creek. Drainage. 103 Comment
  POM62148  Malvella leprosa Roxana Stinchfield 1916-6-17 294 Colusa At Tule levee, College City. Comment
  HSC72144  Marah fabacea J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9576 Colusa Bear Valley Rd., 2.1 mi. from its junction with Hwy. 20 366 Comment
  UCD169735  Marah fabacea Richard R. Halse 2014-3-25 9029 Colusa Along the Sites-Logoda Road ca. 4.7 miles northeast of Logoda; on the west end of Grapevine Pass. 527 Comment
  UCD80838  Marah fabacea Ellen Dean; G. Harrington, J. Alderson, M. Bibbo, B. Rice 2009-3-25 5295 Colusa BLM Bear Creek (Payne) Ranch, lands to the SW of the jct of Hwys 16 and 20. Ridge between Brophy Canyon and the canyon to its north. Highest point just above northern canyon at its terminus in a stock pond. 512 Comment
  SEINET11990999  Marah oregana R. A. DeMartile 1983-1 106 Colusa Goat Mountain Rd 914 Comment
  CAS-BOT-BC361307  Marah watsonii Richard R. Halse 2013-3-26 8744 Colusa Along the Leesville-Logoda Road ca 5.5 miles S of Logoda, or 3.2 miles N of the junction of the Leesville and Bear Valley Roads; Indian Valley 426 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
  UCD56943  Marah watsonii Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3545 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Thompson Canyon. 342 Comment
  UCD66594  Marah watsonii Craig D. Thomsen 2000-4-28 2241 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
  UCD66701  Marah watsonii Craig D. Thomsen 2001-4-12 2432 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
  UCD57553  Marrubium vulgare Andrew Pedersen; with Plant Biology 102 2007-4-29 3 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, near confluence with Craig Creek. 304 Comment
  UCD163883  Matricaria discoidea Craig D. Thomsen 2002-4-10 2593 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
  UC75895  Matricaria occidentalis Miss M. Alice King 1905-1 Colusa near City College; Sacramento Valley Comment
  CHSC94450  Medicago lupulina Lowell Ahart 2006-8-9 13123 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  HSC45689  Medicago polymorpha Patricia Shesgreen 1978-4-22 30 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  SEINET3287499 Image available Medicago polymorpha George K. Helmkamp, E. A. Helmkamp 2009-3-11 14361 Colusa Sacramento Valley; along CA-20, 1.6 miles southwest of Colusa and just north of Colusa National Wildlife Refuge. 15 Comment
  RSA746964  Medicago sativa George K. Helmkamp, E. A. Helmkamp 2008-10-14 14253 Colusa along River Road (generally following the Sacramento River), 1.1 miles north of Colusa 18 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
  JEPS120981  Melica californica Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18639 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
  UCD163713  Melica californica Craig Thomsen 1999-5-10 2025 Colusa Colusa County. At confluence of Sulphur Creek and Bear Creek. About 3 miles north of Hwy 20. 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
  UCR212338  Melica torreyana Craig D. Thomsen 2001-5-24 2510 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
  CHSC112256  Melilotus indicus Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18646 Colusa Inner North Coast Range. On the 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
  CHSC94465  Melilotus indicus Lowell Ahart 2006-8-9 13168 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS120974  Melilotus indicus Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18646 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
  UCD82136  Melilotus indicus Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5669 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
  CHSC115628  Mentha canadensis David Isle; Terril Wolt 2014-9-24 2138 Colusa Northern Sacramento Valley Foothills: W side East Park Reseervoir, ~0.3 mi S of boatlaunch, ~ 100 yds E of normal lake edge in muddy clay soil. (Gilmore Peak California: 10S -0541629E, 4355225N). 353 Comment
  CHSC75615  Mentzelia dispersa Vernon H. Oswald; Lowell Ahart 1999-6-22 9778 Colusa Lily Pond near upper Letts Lake west of Stonyford. 1243 Comment
  UCD38806  Mentzelia micrantha Beecher Crampton 1958-5-19 4821 Colusa Colusa County, 6.3 miles northeast of Ladoga. Comment
  CHSC87161  Micranthes californica Jenny Marr; Beth Hendrickson 1999-2-18 Colusa Vicinity of Funks Creek, Antelope Valley, and Sites. 121 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
  CHSC79254  Micropus californicus var. californicus B. Castro; L. P. Janeway 2000-4-10 1065 Colusa Vicinity of Sites in rolling hills near Sulphur Gap, among un-named tributaries to Lurline Creek. 106 Comment
  JEPS40618  Micropus californicus var. californicus W. L. Jepson 1932-5-8 16279 Colusa Lodoga Comment
  UCD82822  Micropus californicus var. californicus Craig Thomsen; G. Harrington 2009-5-12 2844 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  POM290253  Microseris Lyman Benson 1933-4-16 4325 Colusa Abbott Mine; Inner North Coast mountain range; north fork Cache Creek 762 Comment
  UC75985  Microseris campestris Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  JEPS124230  Microseris douglasii subsp. douglasii Lowell Ahart 2015-4-1 19996 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
  JEPS35674  Microseris douglasii subsp. douglasii W. L. Jepson 1932-5-8 16270 Colusa Ladoga Ladoga (w Colusa County) 457 Comment
  UC133492  Microseris douglasii subsp. douglasii Katharine Brandegee April 1889 Colusa Leesville Comment
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Aug 28 2012
  UCD66860  Microseris douglasii subsp. douglasii Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5063 Colusa BLM Payne Ranch. Lands to the southwest of the intersection of Hwy 16 and Hwy 20. Northwest corner of ranch. Along ridge trail on the border of Lake and Colusa counties, upslope of stock pond. 615 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
  UCR261654  Microseris paludosa Ann Howald 2003-4-24 2322 Colusa Inner North Coast Ranges, Indian Valley, west side of East Park Reservoir, near Pinto Point camping area 368 Comment
  CHSC70969  Microseris sylvatica Vernon Oswald; Lowell Ahart 1998-5-7 8991 Colusa Lodoga-Leesville Rd. 4.3 mi south of Cooks Spring Rd. Roadcut. 469 Comment
  CHSC81250  Microseris sylvatica L. P. Janeway; B. Castro 2001-4-26 7028 Colusa Vicinity of Grapevine Creek, Sites-Lodoga Road, and Eggman Canyon. 286 Comment
  CHSC112006  Microseris sylvatica David Isle 2005-10-7 2126 Colusa Pendell Ranch, S of Fouts Sps Rd 18N01 (M10), 2 mi W of Co Rd 306 Jct; In black adobe soil 150 yds S of Pendell home. 384 Comment
  UCD143422  Microsteris gracilis Oren Pollak 1987-4-10 s.n. Colusa Bear Valley. Comment
  UCD163671  Microsteris gracilis Craig Thomsen 1999-4-15 1971 Colusa Bear Valley. About 7 miles north of Hwy 20. 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
  UCD64436  Microsteris gracilis Craig D. Thomsen 2000-3-31 2068 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
  CHSC108158  Mimetanthe pilosa David Isle; Rhonda Isle 2010-7-21 1915 Colusa Mendocino National Forest - North Coast Ranges Middle Fork Stony Creek Watershed. West shoreline of East Park Reservoir on bank just north of spillway; Within 2 to 4 ft of water line. 365 Comment
  HSC31628  Mimulus aurantiacus var. aurantiacus Glenn McGourty 1974-4-20 13 Colusa Roadcut of Hwy. 16, 17 mi. E of Esparto Comment
  UCD80814  Mimulus douglasii T. Zavortink; G. Harrington 2004-3-23 s. n. Colusa BLM Bear Creek (Payne) Ranch, lands to the SW of the jct of Hwys 20 and 16. Lynch Canyon near roadkill cafe, ca. 1.1 road mi S of gate at Hwy 20. 414 Comment
  UCD82134  Mimulus floribundus Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5664 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
  HSC85824  Mimulus guttatus David Munger, Tallchief Comet, Jeff Dunk 1987-4-12 78 Colusa Bear Valley Comment
  JEPS15273  Mimulus guttatus Rimo Bacigalupi 1950-4-16 3105 Colusa ridge above and n Red Bridge Camp (between and above the confluence of the Nprth and Middle Forks of Stony Creek, very close to Glenn Co. line); Inner North Coast Ranges, Mendocino National Forest 579 Comment
  JEPS14629  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
  UC971992  Mimulus layneae Herbert L. Mason 1952-6-19 14305 Colusa Black Diamond Ridge Mendocino National Forest 609 Comment
  JEPS86637  Mimulus microphyllus L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-18 6685 Colusa along trail from Frog Pond to East Peak (sw flank of mtn.); Snow Mtn. 1900 Comment
  UC71647  Mimulus microphyllus Miss Alice King 1905-1 Colusa College City Comment
  UC725827  Mimulus microphyllus A. A. Heller 1942-5-29 16482 Colusa 1/2 mi w Highway #16 (along State Highway #20) Comment
  UCD81724  Mimulus nasutus Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5728 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
  UC71770  Mimulus pilosus H. P. Chandler 1905-9-14 Colusa Princeton Comment
  UCR261755  Mimulus pilosus Ann Howald 2003-5-30 2358 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3 miles north of Lodoga, ridge west of Serenity camping area 373 Comment
  RSA794844  Mimulus pilosus D. Isle, Rhonda Isle 2010-7-21 1915 Colusa West shoreline of East Park Reservoir on bank just north of spillway; within 2 to 4 feet of water line. 365 Comment
  UC1614402  Minuartia cismontana Charles M. Belshaw 1937-4-25 2833 Colusa vicinity of Cook's Spring (Devil's Ridge); Inner N. Coast Range, Devil's Ridge Comment
  CAS-BOT-BC388583  Minuartia douglasii Annetta Carter 1938-5-7 1377 Colusa Comanche Hills, 4 miles north of Rumsey, Inner North Coast Range 259 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
  UCD82737  Minuartia douglasii Craig Thomsen; G. Harrington 2009-5-14 2918 Colusa Colusa County on Walker Ridge: south of spur road about 1/2 mile east of Walker Ridge Road, en route to Eaton Springs. 762 Comment
  UCD84445  Monardella Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6053 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
  CHSC48491  Monardella odoratissima subsp. pallida Vernon Oswald 1984-7-20 1611 Colusa Near the Lily Pond n of Letts Lake in the Mendocino National Forest. 1280 Comment
  CAS-BOT-BC220676  Monardella villosa A. A. Heller 1916-6-6 12355 Colusa Coast Range on the grade about 3 miles west of Leesville Comment
  CHSC83196  Monardella villosa D. Sanchez-Mata 1996-6-27 Colusa Williams. Blue Ridge. In Bear Creek. Comment
  UC2042512  Monardella villosa Holly Forbes and Barbara Keller 2011-7-7 Colusa Walker Ridge Road 6.1 miles N from its intersection with Highway 30. 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
  JEPS108809  Monardella villosa subsp. villosa Lowell Ahart 2006-6-11 12672 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
  RSA724856  Monardella villosa subsp. villosa L. Ahart 2006-6-11 12672 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
  CDA20256  Monardella villosa subsp. villosa G. D. Barbe, Nola Parmer 1982-6-4 3637 Colusa North Coast Ranges; Goat Mountain Rd, w of Lodoga-Stonyford Rd, Mendocino National Forest. 0 Comment
  UC629741  Monolopia major Ethel Crum 1938-5-8 2035 Colusa 4 mi s Leesville; Bear Valley 426 Comment
  POM256988  Monolopia major Ethel Crum 1938-5-8 2035 Colusa Bear Valley, four miles south of Leesville 427 Comment
  CHSC29715  Muilla maritima K. R. Stern 1980-6-1 6642 Colusa South central border area of Colusa National Wildlife Refuge. 45 Comment
  CAS-BOT-BC83273  Myosurus minimus Roxana S. Ferris 1918-4-10 1443 Colusa 4 miles east of Williams. Comment
  CAS-BOT-BC83279  Myosurus minimus A. A. Heller 1921-4-10 13538 Colusa Near Colusa. Comment
  CAS-BOT-BC83282  Myosurus minimus James Jokerst 1986-5-6 2299 Colusa Near Lurline Creek. 41 Comment
  UC1101350  Myosurus minimus Herbert L. Mason 1953-4-5 14509 Colusa 3 mi e of Maxwell Comment
  UC1738123  Myosurus minimus D. E. Stone 1955-5-2 7 -13 Colusa 3 mi E of Maxwell ( on Maxwell Rd.) Comment
  CAS-BOT-BC83281  Myosurus minimus Alice Eastwood 1922-4-24 11188 a Colusa Road between Princeton and Norman. Colusa/Glenn county line. Comment
  UCD96586  Myosurus minimus H. L. Mason 1953-4-5 14509 Colusa Three miles east of Maxwell. Comment
  UC1738124  Myosurus sessilis D. E. Stone 1956-10-9 1- 8 -1 Colusa 3 mi E of Maxwell ( on Maxwell Rd.) Comment
  POM312437  Myosurus sessilis H. L. Mason 1953-4-5 14510 Colusa 3 miles east of Maxwell Comment
  POM312445  Myosurus sessilis H. L. Mason 1953-4-5 14508 Colusa 3 miles east of Maxwell Comment
  UCD67084  Najas gracillima Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5106 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
  UCD81889  Najas gracillima Ellen Dean; Bear Creek Ranch Grazing Committee 2009-6-19 5773 Colusa BLM Bear Creek (formerly Payne) Ranch. Lands to the SW of the junction of Hwys 16 and 20. Central part of ranch at large stock pond. 492 Comment
  RSA63373  Najas graminea Milo S. Baker 1946-9-4 11600 Colusa Irrigation ditch, along eastern end, West Gridley Road, Butte Sink. Comment
  UC1100011  Najas guadalupensis Herbert L. Mason, Verne Grant 1946-9-5 13120 Colusa 1.6 mi w of Williams (Road to Lake County) Comment
  UCD138157  Najas guadalupensis subsp. guadalupensis Herbert L. Mason; Verne Grant 1946-8-15 13008 Colusa 2 miles west of Colusa on Williams highway by bridge. Comment
  UCD57857  Nassella cernua Gordon Harrington; Diana Hickson, Jack Alderson 2007-4-29 44 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Along Thompson Creek, upstream (west of) Road Kill Cafe. On a terrace at the confluence of Thompson Creek and a tributary, approximately 3/4 mile upstream from the breached dam near Road Kill Cafe. 413 Comment
  CHSC88537  Nassella pulchra B. Castro 2003-5-15 1441 Colusa Vicinity of Logan Ridge, Sulphur Gap and Lurline Creek. Upper and mid-slope on steep E-facing side of S-trending canyon. 213 Comment
  UCD57618  Nassella pulchra Jill Poloske; 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 part of ranch. Near the intersection of Thompson Canyon and Craig Canyon. West of spring, the headwaters of Craig Creek. 365 Comment
  UC908409  Navarretia cotulifolia Herbert L. Mason 1946-5-30 12817 Colusa near Eppersons; Bear Valley Comment
  CHSC72457  Navarretia divaricata subsp. vividior L. P. Janeway; David Isle 1998-7-3 5711 Colusa Along Pacific Ridge Road (16N06) 0.5 mi east of road to Spanish Ridge and Hough Springs; about 50 ft below ridge top on north-facing slope. 1051 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
  CHSC112919  Navarretia heterandra B. Castro; Robin Carter, Amy Lyons 2010-5-13 1806 Colusa Vicinity of Golden Gate in Logan Ridge, Funks Reservoir, and the Tehama-Colusa canal in distrubed, grazed annual grassland. 119 Comment
  CHSC76766  Navarretia heterandra J. Marr; H. West 1998-5-8 Colusa Vicinity of Sites and Antelope Valley. 114 Comment
  CHSC89844  Navarretia heterandra B. Castro; L. Janeway 2001-5-2 1242 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
  UCD48445  Navarretia heterandra Collector unknown 1946-5-30 s.n. Colusa Colusa Co. Comment
  CAS-BOT-BC230316  Navarretia jepsonii Katharine Brandegee 1916-8-10 s.n. Colusa Bear Valley, near Eppersons Comment
  UC971993  Navarretia jepsonii Herbert L. Mason 1952-6-19 14307 Colusa Black Diamond Ridge Mendocino National Forest 609 Comment
  CAS-BOT-BC230318  Navarretia jepsonii A. A. Heller 1940-6-7 15709 Colusa 7 miles N of Stonyford Comment
  CAS-BOT-BC230339  Navarretia leucocephala subsp. bakeri Niall McCarten 1985-5-6 5111 Colusa S side of Standard road, 0.2 mile W of Mills Orchards Road NW of Williams Comment
  CHSC107978  Navarretia leucocephala subsp. leucocephala B. Castro; Robin Carter, Jessica Boyt 2011-4-25 1854 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; ca 5 air mi NW of Maxwell, 0.8 mi southeast of Funks Reservoir and 0.3 mi northeast of Tehama-Colusa Canal. Towards north end of vernally moist swale which extends northeast of large +- saline/alkaline wetland/marsh, in drying vernapool bottom. 49 Comment
  CHSC86971  Navarretia nigelliformis B. Castro 2003-5-14 1432 Colusa Vicinity of Logan Ridge, Sulphur Gap and Lurline Creek. At lower end of SE-trending ridge, on west edge of Sacramento Valley. 134 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
  UCD63739  Navarretia pubescens Craig D. Thomsen 2008-5-23 2745 Colusa BLM Payne Ranch. Southwest of intersection of Hwy 16 and Hwy 20. About 1 mile south of Hwy 20 (south of Destanella Flat) and 2.5 miles west of Hwy 16. 415 Comment
  UCD72461  Navarretia pubescens Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3795 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
  UC1585893  Nemacladus capillaris Barbara Ertter 1989-7-1 8599 Colusa ca 12 air mi wsw Stonyford (road to Goat Mt. Lookout, 2.2 mi s of Rt M-10 (Bear Creek-Fouts Spring Rd) at head of South Fork Stony Creek); Stony Creek 1500 Comment
  UCR78370  Nemacladus capillaris Barbara Ertter 1989-7-1 8599 Colusa road to Goat Mtn Lookout, 2.2 mi. south of Route M-10 (Bear Creek - Fouts Spring Road) at head of S Fork of Stony Creek, c. 12 air mi. WSW of Stonyford 1500 Comment
  CHSC79485  Nemacladus montanus B. Castro; L. P. Janeway 2000-5-4 1138 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 249 Comment
  UCD82741  Nemacladus montanus Craig Thomsen; G. Harrington 2009-5-14 2922 Colusa Colusa County on Walker Ridge: southeast of Methany flat. 579 Comment
  UCD82389  Nemophila Craig Thomsen; G. Harrington 2009-5-12 2831 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
  CAS-BOT-BC361305  Nemophila heterophylla Richard R. Halse 2013-3-26 8738 Colusa Along the Leesville Road ca. 5.6 miles NW of its junction with State Hwy 20, west of Williams. 157 Comment
  JEPS95489  Nemophila heterophylla Vernon H. Oswald and L. Ahart 1994-4-6 6058 Colusa T17N R6W NW1/4 Sec. 31, 1520 ft, Chaparral. Goat Mtn. Rd. 0.1 mi NE of Digger Pine Flat, S of Stonyford 463 Comment
  UC107269  Nemophila heterophylla K. Brandegee April 1889 Colusa Stites 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
  UC72014  Nemophila heterophylla Miss M. Alice King 1905-1 Colusa near College City (Sacramento Valley); , near College City Comment
  RSA589947  Nemophila heterophylla Michael A. Vincent, Robert M. Rhode 1996-3-30 7272 Colusa Along St Hwy 16, near mile marker 6/65, a little N of the Yolo Co. line; 6.65 mi S jct St Hwy 20. Comment
  CHSC14017  Nemophila menziesii G. Notch 1974-3-30 122 Colusa Locally scattered along roadside ca. 0.5 mi w of jct of Hwys 20 and 16 on Hwy 20. 335 Comment
  JEPS1484  Nemophila menziesii Ruth Johnson 1915-4-6 Colusa College City Comment
  JEPS2989  Nemophila menziesii Alice King May, 1908 Colusa College City Comment
  RSA537462  Nemophila parviflora var. parviflora Barbara Ertter 1989-7-1 8614 Colusa Road to Goat Mountain Lookout 1.7 miles S of Rt. M-10 (Bear Creek-Fouts Spring Road) at head of S Fork Stony Creek, ca. 12 airmiles WSW of Stonyford. 1463 Comment
  CDA16097  Nemophila pedunculata G. F. Hrusa 1999-5-16 15046 Colusa North Coast Ranges; Summit of Goat Mtn on N side, on road to Young's Corral, +/- 1/4 mi N of intersection to Goat Mtn Lookout. 1706 Comment
  UCD119932  Nemophila pedunculata J. M. Tucker; Ted Niehaus 1960-4-3 3584 Colusa 9.1 miles above State Highway 20, Bear Valley (Wilbur Springs) Road. 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
  RSA0118880  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
  SEINET6174905  Nicotiana glauca R. R. Halse 2007-3-25 7123 Colusa Along State Hwy. 20 ca 7.8 miles NE of junction with State Hwy. 16 at base of Salt Canyon, 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
  CHSC101616  Nuttallanthus canadensis David W. Isle; Teal Richards 2002-4-18 1652 Colusa Mendocino National Forest. N of Fouts Springs, S of Chlorinator Building on road to Bathhouse Trail (Snow Mountain). 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
  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
  CAS-BOT-BC502598  Orobanche californica subsp. jepsonii Roxana Stinchfield 1916-7-11 451 Colusa Colusa--Williams Road at trough Comment
  RSA0006070  Orobanche comosa H. P. Chandler 1905-10 s.n. Colusa Princeton Comment
  RSA0076585  Orobanche fasciculata Frank W. Gould 1938-4-22 283 Colusa At head of Capay Valley, west of Arbuckle. Comment
  CAS-BOT-BC7016  Orobanche grayana var. jepsonii Harley Pierce Chandler 1905-10-1 s.n. Colusa Princeton Comment
  SEINET10549723  Orthocarpus purpurascens Houseman 1984-4-28 HOUSEMAN 11 Colusa T15n, r5w, s7. Sw 1/4, 2.9 m w of leesville lodoga junction, brim rd in bear Valley. Collected in moist, open, grassy meadow. Growing with layia, Convolvulus, and lupinus. Flowers pale purple. 418 Comment
  CHSC72422  Osmorhiza chilensis L. P. Janeway; David Isle 1998-7-3 5710 Colusa Along Pacific Ridge Road (16N06) 0.5 mi east of road to Spanish Ridge and Hough Springs; about 50 ft below ridge top on north-facing slope. 1051 Comment
  UCD110420  Packera clevelandii Daniel Slakey; CNPS volunteers 2011-6-12 6 Colusa Walker Ridge. Wet meadow area on E side of Walker Ridge Rd. About 18 km N of Hwy.20 by road. 876 Comment
  UCD134746  Packera clevelandii A. M. Shapiro 1994-6-12 s.n. Colusa along Goat Mountain Road, between Sullivan Creek and Summit Lookout. Comment
  UCD163342  Packera clevelandii Craig D. Thomsen 2007-7-31 s.n. Colusa Walker Ridge. East of Eaton Springs en route to Rathburn Mine. Comment
  UCD163853  Packera eurycephala Craig D. Thomsen 2000-5-30 2274 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCD134779  Packera eurycephala John M. Tucker 1968-5-4 4108 Colusa Bear Valley, 8.6 miles (by Bear Valley Road) northwest of junction with State Highway 20. 396 Comment
  CHSC70785  Packera eurycephala var. eurycephala B. Castro; D. Isle, L. Hanson, L. Janeway 1995-4-28 565 A Colusa Stonyford area, along the west bank of Salt Creek, beginning ca 20 yds N of Dennis Drive, extending into fenced field to the W and into property to the N of field. 371 Comment
  JEPS118687  Packera eurycephala var. eurycephala David Isle 2011-5-8 1902 Colusa E of Isle home, concen. W of E fenceline. 2253 Dennis Dr, Stonyford in W 5 Ac of S 1/2 of NW 1/4 of SW 1/4 of SE 1/4. Gilmore Peak 7.5' quad. Comment
  SFV12205  Packera eurycephala var. eurycephala J. M. Tucker 1968-5-4 4108 Colusa Bear Valley, open valley floor, 8.6 miles (by road) northwest of junction of Bear Valley Road and State Highway 20. 396 Comment
  UC1299386  Paeonia brownii Freed W. Hoffman 1948-6-27 2493 Colusa 8.6 mi sw Fouts Springs (w Colusa Co.); upper Letts Valley 1310 Comment
  CHSC94428  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
  UCD89786  Panicum capillare subsp. hillmanii Beecher Crampton 1969-6-18 8457 Colusa 1.5 miles south of Williams. Interstate Hwy. 5 northbound. Comment
  CAS-BOT-BC253936  Parapholis incurva A. A. Beetle 1942-5-21 3271 Colusa 12 miles N of Williams Comment
  SEINET238367 Image available Parapholis incurva Beecher Crampton 1953-4-29 1143 Colusa 2 miles east of Maxwell. Comment
  CDA11258  Parnassia californica G. F. Hrusa 1994-11-7 11993 Colusa North Coast Biodiversity Arena; Banks of Little Stony Creek, approx. 2.5 miles above Stonyford-Lodoga Rd. on Goat Mtn. Rd. Comment
  POM198505  Paspalum distichum Roxana Stinchfield 1916-7-11 454 Colusa Williams Road-the 'Trough' Comment
  UCD66918  Paspalum distichum Craig D. Thomsen; G. Harrington 2008-7-6 2780 Colusa BLM Payne Ranch. Lands to the SW of the jct of Hwys 20 and 16. Western edge of ranch on ridge above Cache Creek canyon. Along ridge trail. 510 Comment
  UC766200  Pectocarya penicillata R. F. Hoover 1938-4-24 3220 Colusa w Arbuckle; Sand Creek foothills Comment
  UC766994  Pectocarya pusilla R. F. Hoover 1938-4-23 3209 Colusa Upper Sand Creek Comment
  UCD165931  Pedicularis densiflora Ellen Dean; with Tom Starbuck 2016-4-24 8842 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). 398 Comment
  UCD83683  Pedicularis densiflora John Rosenthal; with PLB 102 class 2010-5-2 4 Colusa Walker Ridge. East slope of Walker Ridge. Eaton Springs area. 716 Comment
  JEPS80796  Pedicularis semibarbata L. R. Heckard and J. C. Hickman 1981-7-30 5766 Colusa along Trout Creek (se side of Mount Snow); Snow Mountain 1554 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
  CHSC46033  Pellaea mucronata Lowell Ahart 1976-11-14 1004 Colusa On the north side of the Sites Lodoga Road, about 3 miles north-west of Sites. 365 Comment
  CAS-BOT-BC77156  Pellaea mucronata subsp. mucronata Josh Suchocki; Charlene Vullo; Kyle Wear 1995-4-1 39 Colusa Along Brim Rd. 1.6 miles west of the junction with Bear ValleyRd. (Robber's Flat) 487 Comment
  SEINET3873302  Pellaea mucronata subsp. mucronata Stephen Plant 1978-4-22 212 Colusa Wilber Springs Quad. Bear Valley Road, 1.5 miles from its junction with State Route 20.; 0 411 Comment
  UCR225459  Penstemon heterophyllus subsp. australis Ellen Dean, Gordon Harrington J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5114 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 551 Comment
  HSC67100  Penstemon heterophyllus subsp. purdyi S. Harris, B. Ferguson, M. Smith, M. Moble 1980-4-19 Colusa Leesville Rd., road from Leesville to Williams, 3.8 mi. E of Leesville Comment
  CHSC105197  Penstemon heterophyllus var. heterophyllus B. Castro; L. P. Janeway 1999-7-5 1011 Colusa Ca 11 air mi SSW of Stonyford, 5 mi NW of Indian Valley Reservoir, just N of Colusa/Lake Co line, along small rd to Bear Wallow Spring. In serpentine substrate on NNW-facing slope W of Lovelady Ridge rd ca 0.5 mi N of its jcn with USFS Rd 16N06, 0.6 mi NE of Pacific Point. 1057 Comment
  CHSC26461  Penstemon heterophyllus var. purdyi L. V. Ritter 1969-4-30 224 Colusa Ca. 10 mi sw of Williams, s side of Hwy. 20. Comment
  NY601768  Penstemon heterophyllus var. purdyi L. Constance 1938-4-22 2148 Colusa Above Salt Creek, Lower Lake-Williams road, 11 miles northeast of Lake-Colusa line, Inner North Coast Ranges. 152.4 Comment
  NY601740  Penstemon heterophyllus var. purdyi C. C. Freeman 1983-5-22 1891 Colusa CA 20, 2.2 miles north-northeast of the junction of CA 20 & 16 in the foothills of the Sierra Cascades. Comment
  NY601765  Penstemon heterophyllus var. purdyi A. A. Heller 1919-5-10 13118 Colusa Valley west of Leesville Comment
  UC76098  Penstemon heterophyllus var. purdyi Miss M. Alice King 1905-1 Colusa near College City (hills beyond Arbuckle); Sacramento Valley, near College City, Arbuckle Comment
  UCD124200  Penstemon purpusii G. Ledyard Stebbins Jr. 1964-7-4 6174 Colusa East of summit, Mt. St. John, west of Stonyford. 1828 Comment
  CDA8447  Pentachaeta exilis N. van Kleeck, Willa May Lowary 1970-4-18 Colusa Bear Valley, just south of Ladoga. 0 Comment
  JEPS75733  Perideridia kelloggii L. R. Heckard 1974-9-9 3875 Colusa Just northeasts of rocky promontory southeast of Foutch Camp; Snow Mts. Comment
  UCD63128  Perideridia kelloggii Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4958 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Meadow to the east of Destinella Flat, ca. 3 rd miles west of the junction with Hwy 16 on the south side of Hwy 20. 526 Comment
  UCD82501  Perideridia kelloggii Craig Thomsen; G. Harrington 2009-5-12 2860 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  RSA0118884  Persicaria lapathifolia Lowell Ahart 2013-10-1 19090 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
  UCD99460  Persicaria lapathifolia H. R. Drever 1945-8-24 s.n. Colusa Near Grimes. Comment
  UCD99498  Persicaria lapathifolia June McCaskill 1954-8-9 356 Colusa ca. 2 miles east of Princeton and 300 yards south of Glenn County line. Comment
  CHSC94459  Persicaria punctata Lowell Ahart 2006-8-9 13133 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  CHSC62845  Phacelia distans Vernon H. Oswald; Lowell Ahart 1994-3-23 6021 Colusa Goat Mtn. Rd. just W of the bridge over Sullivan Creek, S of Stonyford. Locally common in gravelly serpentine soil on the bank between the road and Little Stony Creek. 505 Comment
  JEPS95504  Phacelia distans Vernon H. Oswald and L. Ahart 1994-3-23 6021 Colusa T16N R7W NE1/4 NW1/4 Sec. 1, 1660 ft, Chaparral. Goat Mtn. Rd. just W of the bridge over Sullivan Creek, S of Stonyford 505 Comment
  CAS-BOT-BC278171  Phacelia distans Mona Bourell 1997-3-29 5807 Colusa Mendocino National Forest along Road near Brittan Ranch, 0.1 mi. N of North Fork Campground Comment
  HSC35373  Phacelia distans Robert M. Specht 1975-5-4 169 Colusa 1/2 mi. NE of Fouts Springs along Stoney Creek 488 Comment
  CHSC7067  Phacelia divaricata M. I. Moore 1969-4-15 9 Colusa 19.3 mi w of Williams, Calif. s side of Hwy. 20. 182 Comment
  UCD63026  Phacelia divaricata Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4678 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Basin at top of ridge to the northwest of Eula Canyon and southwest of Cowboy Camp on the west side of Bear Creek. 513 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
  RSA133612  Phacelia egena L. R. Heckard, C. Ritchie Bell 1951-6-14 176 Colusa Near Stonyford. Comment
  UC901823  Phacelia egena L. Constance, R. Bacigalupi, C. R. Bell, and A. H. Holmgren 1950-4-26 3320 Colusa road cut 1 mi se Sites; Stone Corral Creek 76 Comment
  SD58509  Phacelia egena L. R. Heckard, C. R. Bell 1951-6-14 176 Colusa West facing serpentine slope near Stonyford. 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
  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
  UCD66688  Phacelia imbricata Craig D. Thomsen 2000-5-11 2317 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
  HSC44464  Phacelia tanacetifolia R. York 1978-4-22 141 Colusa Bear Valley Rd., 1.5 mi. from its junction with S.R. 20 409 Comment
  JEPS1305  Phacelia tanacetifolia R. F. Hoover 1938-4-24 3230 Colusa below Sites; Stone Corral Canyon Comment
  CAS-BOT-BC258849  Phalaris aquatica Alice Eastwood; John Thomas Howell 1940-6-10 7875 Colusa Williams Comment
  UCD82490  Phalaris aquatica Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5676 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
  CAS-BOT-BC259027  Phalaris lemmonii Roxana S. Ferris 1917-4-12 547 Colusa 4 miles east of Williams Comment
  UC50462  Phalaris paradoxa J. Burtt Davy May, 1898 4264 Colusa near Princeton; near Princeton 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
  UCR206397  Phlox gracilis George K. Helmkamp, E. A. Helmkamp 2009-3-11 14370 Colusa Inner North Coast Range Foothills, along CA-20, 9.7 miles southwest of Williams, on the north side of Salt Creek 162 Comment
  CDA11389  Phoradendron densum G. F. Hrusa, K. van Katwyk 1995-4-22 12109 Colusa Inner North Coast Ranges; N end of Walker Ridge, approx. 1 m. S of intersection with Bartlett Springs Road. Comment
  UCD82633  Phragmites australis Jack Alderson 2009-9-19 29 Colusa BLM Bear Creek (formerly Payne) Ranch. Lands to the SW of junction of Hwys 16 and 20. Near headwaters of Craig Creek. 518 Comment
  UC727675  Phyla lanceolata Milo S. Baker 1946-9-3 11622 Colusa near locked gate Colusa Gun Club (Butte Sink); Butte Sink Comment
  UCD72530  Phyla nodiflora Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3821 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. 0.5 mile downstream of bridge. 246 Comment
  UCD126735  Physalis acutifolia P. B. Kennedy 1922-1 s.n. Colusa Cortena. Comment
  JEPS24655  Physalis lancifolia J. H. Thomas 1960-8-30 8866 Colusa about 5 mi nw of College City (along road to Sycamore) Comment
  UCR201569  Physalis lancifolia George K. Helmkamp, E. A. Helmkamp 2008-10-14 14270 Colusa Sacramento Valley, along CA-20, 2 miles west of Meridian 14 Comment
  UCD126766  Physalis lancifolia John M. Tucker 1954-8-23 2746 Colusa 7 miles east of Arbuckle, just north of road east from Arbuckle. Comment
  CHSC105195  Pickeringia montana var. montana B. Castro; L. P. Janeway 1999-7-5 1017 Colusa Ca 11 air mi SSW of Stonyford, 5 mi NW of Indian Valley Reservoir, just N of Colusa/Lake Co line, near Bear Wallow Spring. In serpentine substrate on gentle N-facing slope along N edge of USFS Rd 16N06, near top of Pacific Ridge. 1127 Comment
  UC1101610  Pilularia americana G. Thomas Robbins and S. Galen Smith 1950-4-15 1905 Colusa Bear Valley 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
  CAS-BOT-BC227984  Plagiobothrys Doris K. Kildale 1928-5-8 5016 Colusa 3 miles S of Arbucle [Arbuckle] Comment
  CAS-BOT-BC227986  Plagiobothrys Doris K. Kildale 1928-5-8 5014 Colusa 3 miles S of Arbuckle 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
  CHSC81227  Plagiobothrys bracteatus Caroline Warren; Joyce Lacey-Rickert 1998-5-8 Colusa Vicinity of Sites and Antelope Creek. 91 Comment
  CHSC77920  Plagiobothrys canescens Beth Hendrickson; Jean Witzman 1999-4-21 Colusa Vicinity of Antelope Valley and Sites. 137 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
  UC71656  Plagiobothrys canescens Miss Alice King 1905-4-7 Colusa College City Comment
  CHSC71109  Plagiobothrys fulvus Jan Monelo 1989-4-1 14 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
  JEPS68046  Plagiobothrys fulvus W. L. Jepson 1932-5-7 16258 Colusa valley above Venado 304 Comment
  UCD56900  Plagiobothrys greenei Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3503 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
  CHSC55677  Plagiobothrys humistratus K. R. Stern 1980-5-5 6625 Colusa Vernal pool, south central border area of Colusa National Wildlife Refuge. 45 Comment
  CHSC31262  Plagiobothrys leptocladus R. A. Schlising; K. R. Stern 1980-5-5 3584 Colusa Southwest of Colusa at Colusa National Wildlife Refuge; south end of refuge, several miles north of Ware Road; on 'salt flats'. Comment
  CHSC81234  Plagiobothrys nothofulvus Caroline Warren; Jenny Marr, Heidi West, Joyce Lacey-Rickert, Julie 1998-4-14 Colusa Vicinity of Grapevine Creek and Sites-Lodoga Road. 137 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
  SEINET3152906  Plagiobothrys nothofulvus M. A. King 1905-4-7 D Colusa College city Comment
  UC71649  Plagiobothrys stipitatus Miss Alice King 1905-1 Colusa College City Comment
  UC78205  Plagiobothrys stipitatus K. Brandegee Apr 1889 Colusa Colusa Junction Comment
  POM287611  Plagiobothrys stipitatus Lyman Benson 1935-3-27 6340 Colusa 2 mi W of Williams. Inner N Coast mtn range, Sacramento River watershed. 122 Comment
  CHSC107976  Plagiobothrys stipitatus var. micranthus B. Castro; Robin Carter, Jessica Boyt 2011-4-25 1857 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; ca I mi southeast of Funks Reservoir and 0.2 mi northeast of Tehama-Colusa Canal. Large +- alkaline vernal pool/marsh. In vernal pool in compacted E-W road track that goes through marsh. 49 Comment
  CHSC115340  Plagiobothrys stipitatus var. micranthus Lowell Ahart 2015-4-10 20006 Colusa Large size plant, on damp dark soil, along the south edge of Leesville Road. 445 Comment
  OBI6032  Plagiobothrys stipitatus var. micranthus Carl B. Wolf 1928-5-8 2123 Colusa Sacramento Valley, 3 mi S of Arbuckle 43 Comment
  UCD163319  Plagiobothrys stipitatus var. micranthus Craig D. Thomsen 1997-4-20 1914 Colusa Bear Valley. About 6 miles north of Hwy 20. Comment
  UCD18900  Plagiobothrys stipitatus var. micranthus Vernal Pool Team 2001; Carol Witham and Jennifer Buck 2001-4-17 151 B 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: 10S0587286; 4336302. Comment
  UCD66869  Plagiobothrys stipitatus var. micranthus Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5072 Colusa BLM Payne Ranch. Lands to the southwest of the intersection of Hwy 16 and Hwy 20. Northwest corner of ranch. Along ridge trail on the border of Lake and Colusa counties. East side of trail around stock pond. 609 Comment
  UCD66940  Plagiobothrys stipitatus var. micranthus Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5089 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
  CHSC55678  Plagiobothrys stipitatus var. stipitatus K. R. Stern 1980-4-3 6623 Colusa North central portion of Delevan National Wildlife Refuge. 45 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
  RSA10706  Planodes virginica C. B. Wolf 1928-5-8 2125 Colusa Sacramento Valley. 3 mi. S of Arbuckle Comment
  CHSC79538  Plantago coronopus L. P. Janeway; B. Castro 2000-3-23 6637 Colusa Vicinity of Funks Creek and Glenn-Colusa Canal. 47 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
  UCD18844  Plantago coronopus Vernal Pool Team 2001; Carol Witham and Jennifer Buck 2001-4-30 152 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: 10S0587286; 4330302. Comment
  RSA783305  Plantago elongata R. R. Halse 2010-3-20 7828 Colusa Williams. By junction of 5th Street and B Street. 25 Comment
  SEINET3873282  Plantago elongata Richard R. Halse 2010-3-20 7828 Colusa Williams; by junction of 5th Street and B Street.; 0 25 Comment
  UCSC009428  Plantago elongata Lowell Ahart 2015-4-28 20114 Colusa On the north side of Maxwell-Colusa Road, about 5 1/2 miles east of Maxwell 53 Comment
  POM61338  Plantago erecta Roxana S. Ferris 1917-4-12 496 Colusa 4 miles east of Williams. Comment
  UCD56669  Plantago erecta Jack Alderson 2007-3-25 5 Colusa BLM Payne Ranch. Destanella 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. 553 Comment
  UCD57337  Plantago erecta Diane Hickson 2007-3-25 3 Colusa BLM Payne Ranch. Destanella 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
  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
  UCSC009426  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
  UCD14370  Plantago erecta L. Coats 1983-4-24 6 Colusa in the hills at the south end of Bear Valley, along Bear Valley Road, 6.3 miles south of Bartlett Springs Road. 487 Comment
  UCD82366  Plantago erecta Robin McMaster 1973-4-15 336 Colusa Bear Valley. Comment
  CHSC94452  Plantago lanceolata Lowell Ahart 2006-8-9 13153 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UCD138960  Platanthera dilatata var. leucostachys Neil Miller 1973-6-3 96 Colusa area south of Snow Mountain, around 7 miles west of Stonyford. Northwestern part of county. 1219 Comment
  CHSC60119  Platystemon californicus Bryan Case 1988-4-9 128 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
  CHSC79537  Platystemon californicus Simona Altman 1999-4-3 53 Colusa Bear Valley, Bear Valley Rd. 396 Comment
  CAS-BOT-BC91596  Platystemon californicus D. Rhode 1977-4-30 2 Colusa 0.6 miles west Bear Creek. 403 Comment
  CAS-BOT-BC91597  Platystemon californicus K. Brandegee 1889-4-1 s.n. Colusa Unspecified. Comment
  CAS-BOT-BC91598  Platystemon californicus A. A. Heller 1937-4-24 15925 Colusa Meadow on State Highway #20 just west of the junction with Highway #16. Comment
  CDA34082  Platystemon californicus P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  HSC72768  Platystemon californicus J. Krajanowski 1981-4-4 3 Colusa .3 mi. W of junction of Hwy. 20 and Hwy. 16, S side of Bear Creek, 18 mi. SW of Williams 322 Comment
  SEINET12091628  Platystemon californicus C. L. Eddy 1984-1 5 Colusa Ca 0.3 mi W of jct of Hwys 20 and 16, S side of Bear Creek, ca 16 m SW of Williams. Wilbur Springs 322 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
  UCD96066  Platystemon californicus Linda Osbourne 1980-4-12 12 Colusa 0.3 mile west of junction of Highways 20 and 16, south side of Bear Creek, 16 miles SW of Williams. 321 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
  RSA604107  Platystemon californicus var. californicus Steve Daniel 1986-4-13 10 Colusa Bear Valley, 7.6 miles N of junction of Bear Valley Road and Highway 20 396 Comment
  UCD57101  Plectritis ciliosa Gordon Harrington; Diana Hickson 2007-4-7 0017 Colusa BLM Payne Ranch, SW of intersection of Hwy 16 and Hwy 20, 3/4 mile WNW of Roadkill Cafe. 470 Comment
  UCD82392  Plectritis ciliosa Craig Thomsen; G. Harrington 2009-5-12 2835 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
  UC999845  Plectritis ciliosa subsp. ciliosa S. C. Dyal, A. Carter, E. Crum 1938-5-7 683 Colusa near Williams Comment
  UC1018913  Plectritis ciliosa subsp. ciliosa S. C. Dyal, A. Carter, E. Crum 1938-5-7 712 a Colusa Colusa County Comment
  UC1018914  Plectritis ciliosa subsp. ciliosa S. C. Dyal, A. Carter, E. Crum 1938-5-7 712 Colusa Colusa County Comment
  UCD81235  Plectritis congesta subsp. brachystemon Barry Rice; E. Dean, G. Harrington, J. Alderson, M. Bibbo 2009-3-25 s.n. Colusa Bear Creek (formally Payne) Ranch. Lands to the SW of the jct of Hwys 20 and 16. Southern part of the ranch on the south side of a canyon that is immediately north of Brophy Canyon. 274 Comment
  CDA13785  Plectritis macrocera G. F. Hrusa, K. van Katwyk 1995-4-22 12138 A Colusa Inner North Coast Ranges; S side of Leesville Rd. approx. 3 mi. N of Hwy 20, flowers near white. Comment
  CHSC62949  Plectritis macrocera Vernon H. Oswald; Lowell Ahart 1994-4-6 6067 A Colusa Goat Mtn. Rd. at Sullivan Creek, 1.2 mi SW of Digger Pine Flat. S of Stonyford. 469 Comment
  CHSC71006  Plectritis macrocera Vernon Oswald; Lowell Ahart 1998-5-7 9007 Colusa Barlett Springs Rd. 2.1 mi west of Bear Valley Rd., 0.8 mi east of Sawtelle Valley and Grapevine Flat roads. 524 Comment
  JEPS16219  Plectritis macrocera Rimo Bacigalupi, Arthur Holmgren 1950-4-26 3171 Colusa 7.7 mi w of Sites (Grapevine Grade to Lodoga) Comment
  UC999820  Plectritis macrocera S. C. Dyal, A. Carter, E. Crum 1938-5-7 698 Colusa near Williams Comment
  RSA31153  Poa annua A. A. Heller, H. E. Brown 1902-5-2 5439 Colusa Princeton. Comment
  UCD63007  Poa annua Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4660 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
  CAS-BOT-BC254889  Poa bulbosa M. H. Handley 1963-5-1 s.n. Colusa NW of Maxwell 79 Comment
  CHSC35776  Poa bulbosa Gail B. Phillips 1982-3-27 3 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. 143 Comment
  UCD97127  Poa bulbosa Ellen Dean; G. Harrington, J. Alderson 2011-4-10 6911 Colusa Along Bear Valley Road at the Cal Fire station. 335 Comment
  SEINET10822495  Poa bulbosa K. E. Warwick 1978-4-8 Warwick 21 Colusa Salt Creek Canyon, n side of Salt Creek, Hwy 20, 11 mi WSW of Williams. Ca. 100 ft. S of Hwy 20, in open area. Wilbur Springs Quadrangle, 15'. E central border of Sect. 32. T15N, R4W. Comment
  CHSC101409  Poa leptocoma subsp. leptocoma David Isle 1990-6-6 1530 Colusa From Lower Summit Valley below Rock Outcrop w of Rd 17N10. 1682 Comment
  JEPS120977  Poa secunda Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18643 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
  UCD163303  Poa secunda Craig D. Thomsen 1997-4-7 1894 Colusa Bear Valley. About 5 miles north of Hwy 20. Comment
  UCD64291  Poa secunda Craig D. Thomsen 2000-4-12 2130 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
  JEPS81341  Poa secunda subsp. secunda L. R. Heckard with J. Hickman 1982-7-6 5954 Colusa West Peak Snow Mt 2103 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
  UCD90886  Poa secunda subsp. secunda John R. Davey 1967-12-2 90 Colusa Border, ca. 5-6 miles WSW of Leesville, Bartlett Springs Road N of Baldy Mountain. 609 Comment
  POM62478  Pogogyne douglasii Roxana Stinchfield 1916-7-11 448 Colusa Colusa - Williams Road at Trough Comment
  UC883695  Pogogyne douglasii A. A. Heller 1916-6-9 12387 Colusa Coast Range about 2 miles west of Leesville Comment
  JEPS104398  Polygonum amphibium var. emersum Lowell Ahart 2003-10-23 10656 Colusa In 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
  UC1192334  Polygonum amphibium var. emersum Herbert L. Mason and Verne Grant 1946-8-6 12970 Colusa pond 2.7 mi n Colusa (between Sacramento River and Butte Creek); Butte Sink Comment
  UCR201549  Polygonum aviculare George K. Helmkamp, E. A. Helmkamp 2008-10-14 14267 Colusa Sacramento Valley, along River Road (generally following the Sacramento River), 8.4 miles north of Colusa 17 Comment
  JEPS75842  Polygonum minimum L. R. Heckard 1974-9-10 3902 Colusa West Peak Snow Mt. (ne slope) 2103 Comment
  UC1100402  Polypogon interruptus Malcolm A. Nobs and S. Galen Smith 1949-9-9 1875 Colusa 3 mi w Williams 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
  JEPS75436  Polypogon monspeliensis W. L. Jepson 1934-5-3 16602 Colusa n Colusa (Stegeman Sta.) Comment
  JEPS75438  Polypogon monspeliensis W. L. Jepson 1934-5-4 16604 Colusa Princeton Comment
  UCD61440  Polypogon monspeliensis Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3885 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 1/4 mile NW of parking lot in hills to the west of Bear Creek. 356 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
  JEPS127193  Polystichum munitum Lowell Ahart, John Dittes, Josephine Guardino 2016-2-14 20720 Colusa About 1/2 mile north of Letts Lake, about 1/2 mile south of the large campground, about 13 miles (air) southwest of Stonyford. Comment
  CAS-BOT-BC102381  Populus fremontii Roxana S. Ferris 1917-4-17 624 Colusa Sycamore, Sycamore Slough Comment
  CHSC96689  Portulaca oleracea Lowell Ahart 2006-8-22 13232 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UCD35976  Potamogeton nodosus Beecher Crampton 1963-8-5 6870 Colusa 1/4 mile E Cortena. Comment
  CAS-BOT-BC454026  Potamogeton pusillus subsp. pusillus Milo S. Baker 1946-9-4 11594 Colusa West Gridley Rd, Butte Sink Comment
  UCD35780  Poterium sanguisorba Beecher Crampton 1962-4-17 6217 Colusa Sycamore. Comment
  JEPS27878  Proboscidea louisianica subsp. louisianica Richard Snow 1958-8-3 672 Colusa on road to Leesville near Hwy 20 Comment
  JEPS27877  Proboscidea lutea Richard Snow 1958-8-3 671 Colusa on road to Leesville near Highway 20 Comment
  JEPS80440  Prunella vulgaris var. lanceolata L. R. Heckard and J. Hickman 1980-7-3 5369 Colusa sw slope Snow Mt. (about Summit Springs); sw slope Snow Mt., Summit Springs 1554 Comment
  JEPS80050  Prunus emarginata L. R. Heckard with J. Hickman 1979-6-15 5050 Colusa Snow Mountain, East trail from Frog Pond to cirque of east and w peaks Snow Mountain 1981 Comment
  UCD141584  Prunus subcordata Ellen Dean 2013-4-3 7596 Colusa BLM Bear Creek Ranch (previously Payne Ranch), at intersection of HWY 16 and HWY 20. Main part of ranch near Roadkill Cafe, along South side of Thompson Creek, Southeast of Roadkill Cafe. 384 Comment
  CHSC91164  Prunus virginiana var. demissa D. Isle 2003-6-24 377 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. GPS: 10S 0523825E 4346753N. 1767 Comment
  POM174580  Prunus virginiana var. demissa Roxana S. Ferris 1926-4-23 6452 Colusa Stream near Ladoga Comment
  UC1299163  Prunus virginiana var. demissa Freed W. Hoffman 1948-6-27 2523 Colusa 8.5 mi sw of Fauts Springs (western Colusa County); North Coast Ranges Comment
  UCD58168  Pseudognaphalium luteoalbum Gordon Harrington 2007-5-15 58 Colusa BLM Payne Ranch. Sandy north side of Cache Creek, about 1/2 mile upstream from the confluence of Cache Creek and Bear Creek. 190 Comment
  CHSC107119  Psilocarphus brevissimus var. brevissimus L. P. Janeway; B. Castro 2011-4-27 10241 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 1.8 km southeast of Funks Reservoir and 0.3 km northeast of Tehama-Colusa Canal. On bare ground in re-vegetating old vehicle tracks through north edge of the marsh. 49 Comment
  JEPS18022  Psilocarphus brevissimus var. brevissimus George B. Rossbach 1955-4-9 558 Colusa 3 mi e Maxwell; Sacramento Valley 18 Comment
  UC1073297  Psilocarphus brevissimus var. brevissimus George B. Rossbach 1955-4-9 558 Colusa 2 mi e Maxwell; Sacramento Valley 18 Comment
  CAS-BOT-BC361830  Psilocarphus oregonus L. R. Abrams 1928-5-8 12589 Colusa 2 miles south of Arbuckle Comment
  UC1601291  Psilocarphus oregonus T. S. Brandegee Apr 1889 Colusa Colusa Junction Comment
  CAS-BOT-BC361875  Psilocarphus tenellus Roxana S. Ferris 1917-4-19 692 Colusa Sycamore Slough Comment
  UC1613326  Psilocarphus tenellus Charles M. Belshaw 1937-4-1 2871 Colusa vicinity Cook's Spring (Devil's Ridge); Inner N. Coast Range, Devil's Ridge Comment
  JEPS80462  Pteridium aquilinum var. pubescens Alice Q. Howard 1972-7-10 3 Colusa trail from Fouts Camp to Box Springs (n side of ridge separating Trout and Paradise Creeks); Snow Mt 1676 Comment
  CHSC112221  Pterostegia drymarioides Lowell Ahart 2013-5-1 18669 Colusa On the east side of Bear Valley Road, about 2 1/2 miles (by road) northwest of the intersection of State Highway 20 and Bear Valley Road. 533 Comment
  CHSC79346  Pterostegia drymarioides B. Castro; L. P. Janeway 2000-4-10 1064 Colusa Vicinity of Sites in rolling hills near Sulphur Gap, among un-named tributaries to Lurline Creek. 121 Comment
  CHSC79550  Pterostegia drymarioides B. Castro; L. P. Janeway 2000-5-2 1120 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 231 Comment
  JEPS89241  Purshia tridentata var. tridentata L. R. Heckard and J. C. Hickman 1981-7-30 5775 Colusa about 1.7 km e (air mi) Snow Mt., West Peak (at e summit of ridge running e of West Peak); Snow Mt. 2042 Comment
  UC1562605  Pyrola picta Barbara Ertter 1989-7-1 8593 Colusa 12 air wsw of Stonyford (road to Goat Mountain Lookout 2.2 mi s of Rte M-10 (Bear Creek-Fouts Spring Rd) at head of South Fork Stony Creek); South Fork Stony Creek 1500 Comment
  UCD146596  Quercus berberidifolia G. F. Hrusa 1998-6-19 14609 Colusa Inner North Coast Ranges. Above upper Little Stony Creek. Goat Mountain Road. Around 1.5 km west of campground. 485 Comment
  UCR225266  Quercus chrysolepis Ellen Dean, Davis Botanical Society 2008-5-31 5032 Colusa west of Hwy I-5 at Maxwell, near summit lookout of Goat Mountain, at end of Goat Mountain Road, western part of ridges below lookout just off the road 1725 Comment
  UC993117  Quercus douglasii J. M. Tucker 1948-9-22 1869 Colusa 11.3 mi w Williams (beside road to Venado) Comment
  UC993119  Quercus douglasii J. M. Tucker 1948-9-22 1869 Colusa 11.3 mi w Williams (beside road to Venado) Comment
  UC993120  Quercus douglasii J. M. Tucker 1948-9-22 1869 Colusa 11.3 mi w Williams (beside road to Venado) 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
Read comments
Apr 18 2009
  UCD13383  Quercus durata Charles Martin 1986-5-17 31 Colusa 5.7 miles west of Stonyford, along Foot Springs Rd. Comment
  UC1299701  Quercus garryana Freed W. Hoffman 1948-6-26 2517 Colusa n side Goat Mt. (near forks of Stonyford and Goat Mt. roads, w Colusa County) 1653 Comment
  JEPS82547  Quercus garryana var. breweri L. R. Heckard 1983-7-27 6112 Colusa s flank Snow Mt. (slopes around Summit Springs) Comment
  SEINET10881720  Quercus lobata Andrew Townesmith, Karen M. Meyer 2007-8-7 Townesmith 908 Colusa Mendocino National Forest, Grindstone Ranger District. Vicinity of Mill Creek Campground/Davis Flat OHV staging area. Off Forest Service route M10, 8.2 miles west of intersection with Lodoga-Stonyford road in Stonyford. T18N R7W, near edge between sections 4 and 5. 499 Comment
  UCD46857  Quercus lobata Herbert L. Mason 1947-3-29 13153 Colusa Butte Sink, along Butte Creek, ca. 3 miles northeast of Colusa. Comment
  UCD57625  Quercus lobata Michele Lanctot; 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. Central part of ranch. Thompson Canyon. North side of Thompson Creek. 356 Comment
  SBBG111415  Quercus palmeri J. M. Tucker 1991-8-19 4496 -a Colusa across Sulphur Crk from and SE of the hotel at Wilbur Springs 426 Comment
  SD225831  Quercus palmeri Roger Raiche 1990-12-2 Colusa Across Suphur Creek from Wilbur Springs; Comment
  UCR255069  Quercus palmeri Roger Raiche 1990-12-2 s.n. Colusa North Coast Range, across Sulphur Creek from Wilbur Springs 412 Comment
  JEPS75737  Quercus vacciniifolia L. R. Heckard 1974-9-10 3886 Colusa s side upper reaches of Dark Hollow Creek; Snow Mt., Dark Hollow Creek 2042 Comment
  JEPS80372  Quercus vacciniifolia L. R. Heckard and J. Hickman 1981-6-22 5604 Colusa s side East Ridge of East Peak; Snow Mt. 1920 Comment
  UCD47499  Quercus wislizeni W. P. Hackett 1960-4-12 29 Colusa 1.7 miles north of Bartlett Springs Road from junction of State Highway 16 and State Highway 20, Colusa County, California. Comment
  UCD47645  Quercus wislizeni Jean Addicott 1963-5-12 44 Colusa On road to Leesville, 16 miles north of junction of State Highways 16 and 20. 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
  JEPS121102  Rafinesquia californica Lowell Ahart 2013-5-1 18670 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
  UC768665  Rafinesquia californica R. F. Hoover 1938-4-24 3211 Colusa Upper Sand Creek Comment
  JEPS83801  Ranunculus alismifolius var. alismifolius L. R. Heckard and J. C. Hickman 1982-7-7 5955 Colusa just n West Ridge Pass (along Cedar Camp-Milk Ranch Trail, pass is nw of West Peak); Snow Mt. 2011 Comment
  CAS-BOT-BC378937  Ranunculus californicus var. californicus Roxana Ferris 1926-4-21 6296 Colusa abandoned rice field 2 mi west of Colusa Comment
  UCR206394  Ranunculus canus George K. Helmkamp, E. A. Helmkamp 2009-3-11 14373 Colusa Inner North Coast Range Foothills, along CA-20, 14.3 miles southwest of Williams 375 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
  CDA43224  Ranunculus canus var. canus Richard R. Halse 2013-3-26 8740 Colusa Along the Leesvilles Road ca 5.6 miles northwest of its junction with State Highway 20, west of Williams. Comment
  JEPS87655  Ranunculus hebecarpus Vernon H. Oswald and Lowell Ahart 1994-4-6 6057 Colusa Goat Mtn. Rd. 0.1 mi ne Digger Pine Flat (s of Stonyford) 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
  HSC72770  Ranunculus hebecarpus J. Krajanowski 1981-4-4 2 Colusa Salt Canyon, N side of Salt Creek, Hwy. 20, 11 mi. WSW of Williams 143 Comment
  HSC47743  Ranunculus muricatus Thomas W. Nelson, Jane P. Nelson 1978-4-29 3948 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  HSC72141  Ranunculus occidentalis J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9573 Colusa Bear Valley Rd., 2.1 mi. from its junction with Hwy. 20 366 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
  UCD83757  Ranunculus occidentalis Ellen Dean; G. Harrington, K. Mawdsley, J. Shepard 2010-5-1 5953 Colusa Colusa County. Walker Ridge. Along Walker Ridge Road, Buck Flat. 875 Comment
  CDA32825  Ranunculus occidentalis var. eisenii P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  UC1191437  Ranunculus orthorhynchus var. bloomeri G. Thomas Robbins and S. Galen Smith 1950-4-15 1907 Colusa Bear Valley Comment
  UCD97058  Ranunculus orthorhynchus var. bloomeri G. Thomas Robbins; S. Galen Smith 1950-4-15 1907 Colusa Bear Valley. Comment
  SEINET13946282 Image available Rhamnus californica A. A. Heller 1916-1 12360 Colusa Coast Range on the grade about 3 mi W of Leesville Comment
  CDA16114  Rhamnus tomentella subsp. crassifolia G. F. Hrusa, Dmitri Geltman (LE) 1999-8-18 15239 Colusa North Coast Ranges; Along Little Stony Creek. 0 Comment
  CHSC105169  Rhamnus tomentella 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 rd ca 0.5 mi N of its jcn with USFS Rd 16N06, 0.5 mi NE of Pacific Point. 1045 Comment
  UCR228656  Rhamnus tomentella subsp. crassifolia Ellen Dean, Davis Botanical Society 2008-5-31 4996 Colusa West of Hwy I-5 at Maxwell, along Goat Mountain Road,following Little Stoney Creek, Little Stoney Creek Canyon 414 Comment
  JEPS41974  Rhamnus tomentella subsp. tomentella W. L. Jepson 1934-7-28 16746 Colusa hills near Cortina Valley; Inner North Coast Range Comment
  HSC62926  Rhus aromatica Marla J. Carollo 1979-4-14 26 Colusa Buch Flat on Walker Ridge Rd. 884 Comment
  UCD116923  Rhus aromatica 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
  CAS-BOT-BC293684  Ribes roezlii Mona Bourell 1997-3-29 5770 Colusa Mendocino National Forest. Dixie Glade Campground 918 Comment
  SFV14515  Ribes roezlii M. L. Vincent 1968-6-6 786 Colusa Goat Mountain Road, 1 mile from Stony Ford turnoff. 1825 Comment
  UC1051741  Ribes roezlii Helen K. Sharsmith 1953-6-20 4297 Colusa n slope Goat Mountain; Inner North Coast Ranges, Mendocino National Forest 1828 Comment
  CHSC27584  Rigiopappus leptocladus Timothy Spira; Robert Schlising 1978-5-13 3238 Colusa Just E of Lake County line, along Hwy 20. Comment
  CHSC86965  Rigiopappus leptocladus B. Castro; Michelle Cedarborg 2003-5-6 1428 Colusa Vicinity of Logan Ridge, Sites Peak and Lurline Creek. 188 Comment
  UC1613352  Rigiopappus leptocladus Charles M. Belshaw 1937-4-1 2878 Colusa vicinity Cook's Spring (Devil's Ridge); Inner N. Coast Range, Devil's Ridge Comment
  UCD163224  Rigiopappus leptocladus Craig D. Thomsen 2000-3-31 2116 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
  UCD82862  Rigiopappus leptocladus Gordon Harrington 2008-4-13 73 Colusa BLM Payne Ranch. Slopes to the SW of junction of Hwy 16 and Hwy 20. E of unnamed creek (flowing now). 385 Comment
  UCR261656  Rigiopappus leptocladus Ann Howald 2003-4-24 2324 Colusa Inner North Coast Ranges, Indian Valley, west side of East Park Reservoir, west side of Little Stony Creek, near service road 356 Comment
  CDA8541  Rigiopappus leptocladus T. C. Fuller 1958-5-27 3668 Colusa South of Highway 20, 1 mile west of junction with Highway 16. 0 Comment
  CHSC85959  Rosa californica Jenny Marr; Caroline Warren 1998-5-4 Colusa Vicinity of Sites, Stone Corral Creek, and Antelope Valley. 106 Comment
  JEPS104208  Rosa californica Lowell Ahart 2003-7-14 10389 Colusa On the w side of Bear Valley Rd, ca 1/4 mi n of the intersection of Bear Valley Rd and Wilber Springs Rd and bridge. 379 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
  UCD61482  Rumex crispus Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3908 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
  HSC102730  Saccharum ravennae J. P. Smith 2013-8-23 13779 Colusa Along State Route 16 above Cache Creek. 192 Comment
  UC72585  Sagina apetala Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  POM313039  Sagittaria calycina H. L. Mason, Verne Grant 1946-8-6 12961 Colusa Pond on Colusa-Marysville Hwy, 4 miles S of Colusa, west side of Sacramento River. 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
  UCD138036  Sagittaria montevidensis subsp. calycina Herbert L. Mason; Verne Grant 1946-8-7 12981 Colusa 8 miles north of Colusa. Comment
  CHSC61041  Salicornia subterminalis Vernon H. Oswald; Mike Wolder, Joe Silveira 1993-7-26 5704 Colusa Colusa National Wildlife Refuge. Tract 7 just SW of the headquarters complex on O'Hair Rd., ca. 2 mi SW of Colusa. 12 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
  JEPS94159  Salix breweri Vernon Oswald and Lowell Ahart 1998-4-21 8944 Colusa Stonyford-Lodoga Rd. 3.7 mi. s. Stonyford 384 Comment
  JEPS95648  Salix breweri Vernon H. Oswald and L. Ahart 1999-6-22 9786 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. Abundant shrubby willow on the rocky bank of Little Stony Creek. 426 Comment
  UC1179059  Salix exigua var. hindsiana Herbert L. Mason 1947-3-29 13157 Colusa ca. 3 mi n.e. Colusa (along Butte Creek, Butte Sink) Comment
  CAS-BOT-BC107838  Salix gooddingii Roxana Stinchfield 1916-7-7 397 Colusa Sycamore slough near Sycamore Comment
  CAS-BOT-BC107841  Salix gooddingii Alice Eastwood 1921-4-11 10237 Colusa Bear Valley 7.3 miles north of junction with California State Highway 20 along Bear Valley Road 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
  UCD164155  Salix laevigata Craig Thomsen 1999-4-27 2000 Colusa southern Bear Valley. Comment
  UCD82128  Salix laevigata Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5658 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
  UCD84432  Salix laevigata Jack Alderson 2009-4-8 34 Colusa BLM Bear Creek Ranch (Previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. Brophy Canyon. 304 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
  CDA5812  Salpichroa origanifolia Agricultural Commissioner 1960-3-29 Colusa 0 Comment
  CDA20233  Salsola australis P. Akers 2003-10-7 s.n. Colusa Sacramento Valley; 5th St and Hillgate Rd, Arbuckle, just E of Hwy 5 behind Shell Stn on RR tracks. 42 Comment
  CDA20232  Salsola australis P. Akers 2003-10-7 s.n. Colusa Sacramento Valley; N of Maxwell on frontage rd E of Hwy 5, W of RR tracks, 1.8 mi N of Delevan Rd. Area mostly S. tragus. 0 Comment
  RSA718219  Salsola soda L. Ahart 2006-9-26 13348 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 5.5 miles east of Maxwell. 24 Comment
  CHSC19702  Salvia columbariae L. A. Wright Jr. 1971-3-27 7 Colusa Scattered ca. 7 mi w of Williams on Hwy 20. Comment
  HSC62788  Salvia columbariae J. M. DiTomaso 1979-4-14 874 Colusa Bear Valley Rd., 3.9 mi. N of S.R. 20, next to Bear Creek. 412 Comment
  UC596149  Salvia columbariae R. F. Hoover 1938-4-24 3228 Colusa ridge between Venado and Leesville Comment
  UC1053451  Sanicula bipinnata Rimo Bacigalupi, Arthur Holmgren 1950-4-26 3170 Colusa 7.7 mi w of Sites (Grapevine Grade to Lodoga); Grapevine Grade Comment
  UC630430  Sanicula bipinnatifida Annetta Carter 1938-5-7 1375 Colusa 4 mi n of Rumsey (Inner North Coast Range, Comanche Hills); Inner North Coast Range, Comanche Hills 243 Comment
  POM174565  Sanicula bipinnatifida Roxana S. Ferris 1926-4-23 6421 Colusa On grade, Williams- Stonyford Road Comment
  UCD66530  Sanicula crassicaulis Craig D. Thomsen 2000-4-12 2153 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
  UCD82730  Sanicula crassicaulis Craig Thomsen; G. Harrington 2009-5-14 2912 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
  SEINET13945257 Image available Sanicula tuberosa Bonnie Prange 1974-1 sn Colusa Wilbur Springs Quad. Near Clyde Mine. T14N R6W SEC12, Elev 2800 ft 853 Comment
  UCR206400  Scandix pecten-veneris George K. Helmkamp, E. A. Helmkamp 2009-3-11 14377 Colusa Inner North Coast Range Foothills, along CA-20, 14.3 miles southwest of Williams 375 Comment
  CHSC110853  Schoenoplectus acutus var. occidentalis David Isle; Rhonda Isle 2013-6-27 2046 Colusa Above (S of) 18N01, ~200 yards NW of jct with OHV Trail 17N12; (~3/4 mi SW of Fouts Springs Loop Rd, E side). 670 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
  RSA530101B  Schoenoplectus maritimus D. W. Taylor 1989-8-4 10420 Colusa Colusa National Wildlife Refuge, on Ohm Road ca. 0.5 miles north of Ware Road 24 Comment
  UCD49961  Schoenoplectus mucronatus June McCaskill 1954-8-9 359 Colusa Ca. 2 miles E of Princeton and 300 yards S of Glenn County line. Comment
  UCD50161  Schoenoplectus pungens D. Sanchez-Mata 1998-7-10 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain between Lodoga and Red Rock Cabin. 420 Comment
  UCD72473  Schoenoplectus pungens Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3807 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
  UCD72537  Schoenoplectus pungens Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3828 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. 251 Comment
  UCD163854  Schoenoplectus pungens var. longispicatus Craig D. Thomsen 2001-4-12 2471 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  CDA417  Scirpus glaucus Kingwill 1929-8-23 Colusa 0 Comment
  JEPS21848  Scribneria bolanderi John R. Swanson 1958-4-26 308 Colusa 1.4 mi w of Bear Valley (on road toward Bartlett Springs) 609 Comment
  JEPS75726  Scutellaria californica L. R. Heckard 1974-9-9 3861 Colusa along trail about 1/3 mi e of Foutch Camp (along Trout Creek); Snow Mountain, Trout Creek 1828 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
  CHSC101618  Scutellaria tuberosa David W. Isle; Teal Richards 2002-4-18 1651 Colusa Mendocino National Forest. N of Fouts Springs, S of Chlorinator Building on road to Bathhouse Trail (Snow Mountain). 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
  HSC35372  Scutellaria tuberosa Robert M. Specht 1975-5-4 170 Colusa 1/2 mi. NE of Fouts Springs along Stoney Creek 488 Comment
  UCD21584  Senecio flaccidus var. douglasii Craig D. Thomsen 2002-11-7 s. n. Colusa N. of Wilbur Hot Springs between Hot Springs gate and hotel. Confluence of Bear and Sulfur Creeks. 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
  HSC46128  Sidalcea calycosa subsp. calycosa J. P. Smith, Thomas W. Nelson 1976-4-14 8582 Colusa Mendocino National Forest, confluence of Stony Creek and N Fork of Stony Creek. 427 Comment
  UC725658  Sidalcea diploscypha A. A. Heller 1942-5-29 16480 Colusa along State Highway #20, 1/2 mi w of the junction with Highway #16 Comment
  UCD82533  Sidalcea diploscypha Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5685 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
  UC584175  Sidalcea keckii J. Clausen 1935-5-20 1013 Colusa on Bartlett Springs road 18 mi w Williams; w of Williams Comment
  UC583287  Silene californica Lewis S. Rose 1936-4-27 36179 Colusa 11 mi nw Rumsey; nw of Rumsey 304 Comment
  CAS-BOT-BC388982  Silene laciniata subsp. californica Lewis S. Rose 1936-4-27 36179 Colusa 11 mi. NW. of Rumsey 304 Comment
  CHSC115387  Silene laciniata subsp. californica Lowell Ahart 2015-4-1 19992 Colusa Along 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
  JEPS124241  Silene laciniata subsp. californica Lowell Ahart 2015-4-1 19992 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
  RSA0060081  Silene laciniata subsp. californica Richard R. Halse 2014-3-25 9036 Colusa Along the Bear Valley Road ca. 1.8 miles west northwest of its junction with State Hwy. 20. 378 Comment
  UCD146701  Silene laciniata subsp. californica G. F. Hrusa 1998-6-19 14603 Colusa above upper Little Stony Creek. Goat Mountain Road around 2 km west of campground. 490 Comment
  CAS-BOT-BC389256  Silene lemmonii Volney Rattan 1884-6-1 s.n. Colusa Summit above Fouts Sp. Coast Mts. North of San Francisco Bay Comment
  JEPS73457  Silene verecunda subsp. platyota L. R. Heckard 1972-7-8 3061 Colusa saddle between East and West Peaks of Snow Mt. saddle between East and West Peak of Snow Mt. 1981 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
  CHSC112272  Sisyrinchium bellum Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18644 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
  HSC31401  Sisyrinchium bellum Maralyn O'Meara, Gary S. Lester 1974-5-4 349 Colusa Walker Ridge Rd., 0.7 mi. from junction with Little Indian Valley Rd. 854 Comment
  JEPS124213  Sisyrinchium bellum Lowell Ahart 2015-4-10 20012 Colusa About 2 miles west of the intersection of Bear Valley Road and Brim Road, about 17 miles (air) west of Williams. Comment
  HSC62938  Sisyrinchium bellum Michael Dalke 1979-4-14 49 Colusa Bear Valley Rd., 13 mi. N of Hwy. 20 396 Comment
  JEPS80059  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
  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
  HSC42017  Solanum parishii M. A. Baker 1977-4-24 222 Colusa Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  NY821077  Solanum parishii R. C. F. Bacigalupi 1950-4-25 3175 Colusa "Grapevine Grade" to Lodoga, ten miles northwest of Sites Comment
  NY821173  Solanum parishii R. J. Stinchfield 1916-6-18 299 Colusa Near College City 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
  CAS-BOT-BC157051  Solanum umbelliferum R. J. Stinchfield 1916-6-18 299 Colusa Timber near College City Comment
  JEPS16203  Solanum umbelliferum Rimo Bacigalupi, Arthur Holmgren 1950-4-25 3175 Colusa 10 mi nw of Sites (Grapevine Grade to Lodoga); Grapevine Grade Comment
  UC1053447  Solanum umbelliferum Rimo Bacigalupi, Arthur Holmgren 1950-4-26 3175 Colusa 10 mi nw of Sites (Grapevine Grade to Lodoga); Grapevine Grade Comment
  CDA15549  Solidago californica G. F. Hrusa 1998-10-28 14900 Colusa North Coast Ranges; along Cedar Camp Rd. as it enters Little Stony Ck. Cyn., approx. 1 mi. from Lodoga/Stonyford Rd. Comment
  CHSC117781  Solidago velutina subsp. sparsiflora David Isle; Terril Wolt 2016-7-15 2168 Colusa North Coast Range:~5 1/2 miles W of Stonyford off S side Fouts Springs Rd M10 (18N01.2). Also ~5/8 mile SE of M10 Jct. w/ Trough Sp R Rd M5 (18N07.1) Fouts Spring California. 609 Comment
  POM313124  Sorghum halepense H. L. Mason 1945-9-19 12723 Colusa Below caus[e]way over Butte Sink spillway, East bank of Sacramento River, 1 mile north of Colusa. Comment
  UCD92752  Sorghum halepense H. L. Mason 1945-9-19 12723 Colusa 1 mile N of Colusa. Below causeway over Butte Sink spillway, E bank of Sacramento River. Comment
  CAS-BOT-BC390067  Spergularia atrosperma Roxana S. Ferris 1917-4-12 509 Colusa 4 miles East of Williams Comment
  CAS-BOT-BC390102  Spergularia bocconi Roxana Stinchfield 1916-6-15 274 Colusa College City Comment
  CAS-BOT-BC390300  Spergularia macrotheca var. macrotheca Malcom A. Nobs; S. Galen Smith 1949-6-18 874 Colusa Highway 99W, near Delevan Comment
  CHSC60677  Spergularia marina Vernon H. Oswald 1993-4-14 5265 Colusa S side of the Tour Route just W of Headquarters, Colusa National Wildlife Refuge, SW of Colusa. 18 Comment
  CAS-BOT-BC390769  Spergularia marina G. B. Rossbach; R. P. Rossbach 1938-5-31 637 Colusa 2 mi. so. of Maxwell Comment
  POM253415  Spergularia salina var. tenuis G. B. Rossbach, Ruth P. Rossbach 1938-5-31 636 Colusa 2 miles S of Maxwell. Comment
  CDA32689  Sporobolus cryptandrus Howard Johnson 1958-12-14 Colusa Arbuckle, Howard Johnson Property, Route 1, Box 91 0 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
  CHSC94482  Stachys ajugoides var. rigida Lowell Ahart 2006-8-9 13118 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  CHSC71433  Stachys albens Vernon H. Oswald; Lowell Ahart 1998-7-15 9268 Colusa Bartlett Springs Rd. 1.6 mi west of Bear Valley Rd. 487 Comment
  CHSC75725  Stachys albens Vernon H. Oswald; Lowell Ahart 1999-6-22 9784 Colusa 1.5 mi west of Stonyford-Lodoga Road on County Road 42 paralleling Little Stony Creek. 359 Comment
  CHSC84233  Stachys albens Lowell Ahart 2003-7-14 10381 A 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
  CHSC88559  Stachys albens L. P. Janeway 2001-6-6 7116 Colusa Inner North Coast Ranges. Malaney Flat, about 4.8 km (air) east of Walker Ridge Road. Large open meadow. 610 Comment
  JEPS94680  Stachys albens Vernon H. Oswald and Lowell Ahart 1998-7-15 9268 Colusa Bartlett Springs Rd. 1.6 mi w Bear Valley Rd. 487 Comment
  JEPS95791  Stachys albens Vernon H. Oswald and L. Ahart 1999-6-22 9784 Colusa 1.5 mi west of Stonyford-Lodoga Road on County Road 42 Stonyford-Lodoga Road; Little Stony Creek; 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
  UCD70231  Stachys albens D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley Road. Bear Valley Creek. 370 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
  CHSC113042  Stachys rigida var. rigida Lowell Ahart 2013-10-1 19080 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-BC374775  Stebbinsoseris heterocarpa Roxana S. Ferris 1917-4-14 570 Colusa 7 mi west of Arbuckle, Arbuckle - Rumsey Road Comment
  UCD65628  Stellaria nitens Craig D. Thomsen 2000-4-12 2128 -b 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
  UCD63014  Stellaria pallida Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4666 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. South of corral on west side of Bear Creek, just south of Hwy 20. 321 Comment
  UCD84552  Stephanomeria Ellen Dean; C. Thomsen, T. Hansen, and windfarm meeting 2010-6-11 6150 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones spring area on W side of road. Ca 6.5 road miles N of junction with Hwy 20. W side of road. 833 Comment
  CHSC79695  Stephanomeria virgata subsp. pleurocarpa G. F. Hrusa 1998-10-28 14899 Colusa Inner Coast Ranges. Along Cedar Camp Rd. as it enters Little Stony Ck. Cyn., approx. 1 mi. from Lodoga/Stonyford Rd. 400 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
  CHSC27624  Streptanthus breweri Robert Schlising; Timothy Spira 1978-5-13 3245 Colusa Ca 0.5 mi NW jct Hwy 20 and Bear Valley (= Wilbur Springs) Road, along latter. 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
  UCD66953  Streptanthus breweri Ellen Dean; Davis Botanical Society 2008-5-31 4997 Colusa west of I-5 at Maxwell, along Goat Mountain Road following Little Stoney Creek, Little Stoney Creek Canyon. 414 Comment
  CAS-BOT-BC61233  Streptanthus breweri Roger Raiche 1985-5-25 RR 50459 Colusa West of Williams, Bear Valley, Bear Valley Road about 1 mile from its origin at Route 20. 365 Comment
  CAS-BOT-BC61239  Streptanthus breweri Oakley Shields 1970-4-17 73 Colusa Near Wilbur Springs 2 miles northwest of Bear Valley Road and Highway 20. Comment
  HSC62796  Streptanthus breweri M. A. Ericksen 1979-4-14 207 Colusa Adjacent to Bear Valley Rd., 3.9 mi. from Hwy. 20 Comment
  SEINET11993713  Streptanthus breweri Unknown 1985-1 50459 Colusa W of Williams, Bear Valley, on Bear Valley Rd about 1 mi from its origina at Rt. 20 366 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
  UC956511  Streptanthus breweri var. breweri Freed W. Hoffman 1947-6-19 1021 Colusa Cook Springs Comment
  JEPS93866  Streptanthus drepanoides Vernon H. Oswald and Lowell Ahart 1998-7-15 9275 Colusa Bartlett Springs Road 2.6 mi w of Bear Valley Road (0.3 mi e of Sawtelle Valley and Grapevine Flat Roads) 624 Comment
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Jul 24 2018
  CHSC40532  Streptanthus glandulosus Sara E. Wold 1982-3-27 7 Colusa Salt Canyon, n side of Salt Creek, hwy 20, ca. 17.7 km wsw of Williams. 145 Comment
  CHSC56756  Streptanthus glandulosus Joel Hoskins 1989-4-1 1 Colusa Ca. 5 yds n of Hwy 20, Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi. wsw of Williams. 143 Comment