Search Results — 2000 specimen records retrieved (1640 records with coordinates)
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 Please cite data retrieved from this page: Data provided by the participants of the Consortium of California Herbaria (ucjeps.berkeley.edu/cch_archive/).
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? Specimen ID Determination * Collector Collection Date Collection Number County Locality Elevation in meters Feedback
  UCD80834  Acer macrophyllum Ellen Dean; G. Harrington, J. Alderson, M. Bibbo, B. Rice 2009-3-25 5291 Colusa BLM Bear Creek (Payne) Ranch, lands to the SW of the jct of Hwys 16 and 20. Canyon to the north of Brophy Canyon. 239 Comment
  CAS-BOT-BC21709  Achillea millefolium J. Clausen 1939-6-26 1743 -2 Colusa 17 miles west of Williams, just before entering Lake County Comment
  JEPS80821  Achillea millefolium L. R. Heckard and J. C. Hickman 1981-7-31 5792 Colusa along, on east side of Snow Mt. Dark Hollow Creek; Snow Mt. 1584 Comment
  UC1071729  Achillea millefolium J. Clausen 1939-6-26 1743 -4 Colusa 17 mi w of, (just before entering Lake County) Williams Comment
  UCD57663  Achillea millefolium Erica A. Smith; 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. Along unimproved road. 313 Comment
  UCD50713  Achnatherum lemmonii Beecher Crampton 1958-5-19 4799 Colusa 5.8 miles south of Lodoga, Colusa County. Comment
  SEINET3245652  Acmispon americanus var. americanus G. K. Helmkamp, E. A. Helmkamp 2008-1 14242 Colusa Sacramento Valley: along CA-20, 0.2 mile east of the Sutter County line (Meridian 7.5') 9 Comment
  UCD64035  Acmispon americanus var. americanus Craig D. Thomsen 2000-6-23 2413 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, Colusa Co. milepost 2.63. 304 Comment
  CHSC94419  Acmispon brachycarpus Lowell Ahart 2006-8-22 13217 Colusa South side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford. 349 Comment
  UCD56668  Acmispon brachycarpus Jack Alderson 2007-3-25 4 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
  UCD64282  Acmispon brachycarpus Craig D. Thomsen 2000-3-31 2098 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
  UCR261667  Acmispon brachycarpus Ann Howald 2003-6-9 2367 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3 miles north of Lodoga, north of Last Chance camping area 372 Comment
  UCR261746  Acmispon brachycarpus Ann Howald 2003-6-9 2362 B 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
  HSC94147  Acmispon grandiflorus G. Fred Hrusa 1998-6-19 14638 Colusa Below Fouts Springs on Fouts Springs Rd. to Stonyford. 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
  SBBG100086  Acmispon grandiflorus var. grandiflorus L. R. Heckard 1969-5-29 2240 Colusa Trough Spring Ridge Rd, 0.2 mi N of its jct with Crackerbox Ridge Rd, ca. 6.5 air mi SE of Stonyford 1127 Comment
  SD131846  Acmispon grandiflorus var. grandiflorus L. R. Heckard 1969-5-29 2240 Colusa Along Trough Spring Ridge road, 0.2 mile north of its junction with Crackerbox Ridge road. 1128 Comment
  CHSC79737  Acmispon rubriflorus L. P. Janeway; B. Castro 2000-5-2 6691 Colusa Vicinity of Grapevine Creek and Sites-Lodoga Road. 225 Comment
  UCR261720  Acmispon rubriflorus Ann Howald 2003-5-30 2354 Colusa Inner North Coast Ranges, Indian Valley, East Park Reservoir, Catholic Point peninsula, Coppermine Road c. 1.2 miles north of intersection with Ruby King Rd., then c. 0.1 mile east on ranch road 397 Comment
  UCR261727  Acmispon rubriflorus Ann Howald 2003-6-9 2363 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3 miles north of Lodoga, east of Sleepy Hollow camping area 383 Comment
  UCR261743  Acmispon rubriflorus Ann Howald 2003-6-9 2365 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3 miles north of Lodoga, at Sleepy Hollow camping area 378 Comment
  CHSC71112  Acmispon wrangelianus Jan Monelo 1989-4-1 13 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. 143 Comment
  HSC44246  Acmispon wrangelianus Barbara Kelly 1977-4-24 351 Colusa Along Walker Ridge Rd. above Barrel Springs Campground. 701 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
  UCD163209  Acmispon wrangelianus Craig D. Thomsen 2000-4-28 2200 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
  UCD163318  Acmispon wrangelianus Craig D. Thomsen 1997-4-20 1916 Colusa Bear Valley. About 6 miles north of Hwy 20. Comment
  UCD104559  Acmispon wrangelianus W. Williams 1951-1 s.n. Colusa Yolo County border. Hwy 16, Bear Creek Valley. Comment
  JEPS75833  Aconitum columbianum L. R. Heckard 1974-9-11 3943 Colusa s.e. Foutch Camp (just e. of large rocky outcroppings, Snow Mt.); Snow Mt. 1859 Comment
  HSC72177  Adenostoma fasciculatum J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9555 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  UC71996  Adenostoma fasciculatum Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  UCD13213  Adenostoma fasciculatum Charles Martin 1986-5-17 27 Colusa Along Sites-Lodoga Road, ca. 8.2 miles W of Sites, on roadside. Comment
  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
  CHSC80490  Aegilops cylindrica Caroline Warren; Joyce Lacey-Rickert 1998-5-8 Colusa Vicinity of Sites and Antelope Creek. 91 Comment
  UCD51585  Aegilops triuncialis D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley, Destanella Flat-Walker Ridge. 450 Comment
  CDA4028  Aeschynomene rudis G. D. Barbe, Daryl Brown 1990-8-29 4392 Colusa West side of Boggs Road between Dodge and Fonseca Roads; 5.6 km southwest of Princeton. 0 Comment
  CDA4029  Aeschynomene rudis G. D. Barbe, June McCaskill 1990-9-5 4397 Colusa West side of Boggs Road between Dodge and Fonseca Roads; 5.6 km southwest of Princeton. 0 Comment
  UCD14573  Aeschynomene rudis June McCaskill; with Jim Hill 1990-8-27 s.n. Colusa Colusa Co.; near Princeton in a rice field; Comment
  HSC86927  Aesculus californica Anthony J. Desch, Bryon Cariss 1988-4-16 33 Colusa 2 mi. W on Brim Rd. from corner of Brim Rd. and Bear Valley Rd. 518 Comment
  UCD14547  Aesculus californica Rob Ickel 1989-5-27 12 Colusa California, Colusa Co.; along Highway 16, 1.5 mi south of junction with Highway 20; 316 Comment
  UC2014168  Agoseris grandiflora Ellen Dean, G. Harrington, C. Thomsen, Chiao-Yi Cheng, R. Wilmarth 2009-5-20 5643 Colusa Colusa County: 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. 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
  UCD64502  Agoseris heterophylla Craig D. Thomsen 2000-3-31 2092 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  JEPS36239  Agoseris heterophylla var. cryptopleura W. L. Jepson 1932-5-8 16286 Colusa w Colusa Co Stonyford Comment
  RSA424738  Agoseris heterophylla var. heterophylla Aaron Liston, M. A. Blumler 1987-4-26 667 -2 Colusa Bear Valley - Lodoga Road, 6.6 miles S of Bartlett Springs Jct. Comment
  UCD92450  Agrostis Beecher Crampton 1958-5-19 4811 Colusa West of Lodoga. Little Stony Creek. Comment
  JEPS110359  Agrostis avenacea Lowell Ahart 2006-8-22 13227 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  UCD51776  Agrostis avenacea Beecher Crampton 1958-5-19 4822 Colusa along US Hwy. 99W, about 3 miles south of Maxwell. Comment
  UCD51793  Agrostis avenacea Beecher Crampton 1958-6-27 4985 Colusa 5 miles south of Colusa. Comment
  CHSC94403  Agrostis exarata Lowell Ahart 2006-8-9 13167 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS73446  Agrostis variabilis L. R. Heckard 1972-7-8 3043 Colusa on ridge running se West Peak, Snow Mt. (on n side) 2011 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
  CHSC91020  Aira caryophyllea D. Isle 2002-4-18 298 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. N of Chlorinator bldg., Rd. to Bathhouse Trail. 548 Comment
  UCR227338  Aira caryophyllea Craig D. Thomsen 2001-4-24 2476 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, south side of Hwy 20, c. 0.25 mi west of Hwy 20/16 intersection, near Colusa Co. milepost 3.0 310 Comment
  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
  UCD63709  Alisma triviale Craig D. Thomsen 2006-8-17 2711 Colusa BLM Payne Ranch. About 0.25 mile south of intersection of Hwy 16 and Hwy 20. Near confluence of Hamilton Flat and Jackson Canyon drainages, about 10 meters east of Bear Creek, west of Hwy 16. Comment
  CAS-BOT-BC459583  Allium amplectens Katherine Esau 1934-5-5 s.n. Colusa Wilbur Springs Quad., Near Rail Canyon Comment
  UCD138480  Allium amplectens G. L. Stebbins Jr. 1962-5-6 6024 Colusa along Highway No. 20, on south bank of Bear Creek, between Williams and Lower Lake, south of Wilbur Springs. 457 Comment
  UCD163213  Allium amplectens Craig D. Thomsen 2000-4-28 2207 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 0.3 mile west of Hwy 20/16 intersection. 345 Comment
  UCD66451  Allium amplectens Craig D. Thomsen 2000-5-11 2297 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  UCD141846  Allium amplectens L. K. Mann; A. Saghir 1963-5-15 s.n. Colusa 7.8 miles north of Leesville toward Lodoga. Comment
  UCD141843  Allium cratericola L. K. Mann; M. D. Mann 1961-4-2 s.n. Colusa Bear Valley. 396 Comment
  CDA15775  Allium falcifolium G. F. Hrusa 1993-5-2 10852 Colusa North Coast Ranges; Frenzel Creek Research Natural Area - Mendocino National Forest. Lower Frenzel Creek, tributary of Little Stony Creek. Comment
  CHSC14088  Allium falcifolium L. V. Ritter 1969-4-30 239 Colusa Ca. 100 yds. W of the junction of Highway 20 and 16, Ca 50 yds. N of Highway 20. Comment
  CHSC71009  Allium falcifolium Vernon Oswald; Lowell Ahart 1998-5-7 9009 Colusa Bartlett Springs Rd. 2.8 mi west of Bear Valley Rd., 0.1 mi east of Sawtelle Valley and Grapevine Flat roads. 633 Comment
  JEPS94212  Allium falcifolium Vernon Oswald and Lowell Ahart 1998-5-7 9009 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
  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
  CHSC115634  Allium falcifolium David Isle; Terril Wolt 2015-4-8 2147 Colusa North Coast Range: N of Fouts Springs; just N of the S Fork Stony Creek. W of FS Gate to Bathouse (Welton Glade) Trailhead ~200-300 ft.. In drainage ditch on S edge rd. (Fouts Springs California: 10S-0529687E, 4356519N). Comment
  UCD141855  Allium falcifolium Roman Gankin 1958-4-25 s.n. Colusa 4 miles west of Leesville. Near head of Bear Valley. 304 Comment
  UCD141788  Allium fimbriatum M. Yamaguchi; D. Hughes, D. G. Hunt 1965-4-29 s.n. Colusa Bear Valley Road (sign to Wilbur Springs) past fenced area after leaving junction of California 16 and 20. Comment
  CAS-BOT-BC135886  Allium fimbriatum subsp. purdyi James Jokerst 1985-4-5 2204 Colusa Wilbur Springs Quad., near Coyote Peak 456 Comment
  CAS-BOT-BC135890  Allium fimbriatum subsp. purdyi David D. Keck 1933-5-30 2398 Colusa Colusa-Lake County line west of Wilbur Springs. Comment
  CAS-BOT-BC135883  Allium fimbriatum subsp. purdyi M. S. Baker 1937-5-17 8657 Colusa Hiway 20, nr. Lake Co. line. Comment
  HSC48164  Allium fimbriatum var. purdyi Thomas W. Nelson, Jane P. Nelson 1978-4-29 3928 Colusa Along Bear Valley Rd., 2 mi. from the junction with State Route 20. 366 Comment
  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
  UCD138533  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
  UC725287  Allium fimbriatum var. purdyi A. A. Heller June, 1937 Colusa Lake Landing Comment
  CHSC2060  Allium peninsulare D. Smith 1935-5-12 Colusa Stonyford hills. Comment
  SEINET3878782  Allium sanbornii var. jepsonii James Payne Smith Jr 1978-4-22 9744 Colusa Wilbur Springs Quadrangle. Bear Valley Road, 1.2 miles from its junction with State Route 20.; 0 411 Comment
  CHSC86119  Allium serra Jenny Marr; Caroline Warren 1998-5-4 Colusa Vicinity of Sites, Stone Corral Creek, and Antelope Valley. 106 Comment
  HSC66002  Allium serra Cathie Goldberg, Lynn Kunstman, Lauren Philbrick, Geoff Walsh 1980-4-19 53 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
  JEPS56391  Allium serra W. I. Follette 1935-4-1 Colusa 13.7 mi sw Williams (8.1 mi e of Colusa-Lake county line) Comment
  CAS-BOT-BC475548  Allium serra H. C. Cantelow 1936-4-11 1184 Colusa Bear Creek Canyon Comment
  CAS-BOT-BC475549  Allium serra James R. Shevock 1973-4-14 2551 Colusa Occasional along Leesville Road; Northern Coast Ranges Comment
  HSC90409  Allium serra Joe Doyle, Gayle Honeycutt, Ethan Freid 1992-4-11 52 Colusa 1.7 mi. W of intersection between Walker Ridge Rd. and Bear Valley Rd. 415 Comment
  UCD141808  Allium serra L. K. Mann 1958-5-3 s.n. Colusa 0.2 mi. toward Clear Lake from junction of California Highway #16 and #20. 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
  UCD141824  Allium serra M. Yamaguchi; D. Hughes, D. G. Hunt 1965-4-29 s.n. Colusa 6.6 miles south of Lodoga on Leesville-Lodoga Road, on right side of road. Comment
  UCD141827  Allium serra M. Yamaguchi; D. Hughes, D. G. Hunt 1965-4-29 s.n. Colusa ca. 8.8 miles west of Maxwell (U.S. Highway 99W) or ca. 0.6 mile east of Sites about 180 feet northwest of bridge and old stone house. Comment
  RSA113928  Allophyllum divaricatum H. K. Sharsmith 1953-6-19 4280 Colusa One mile north of Trough Springs on Trough Springs Ridge. Mendocino National Forest 915 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
  HSC72148  Allophyllum gilioides J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9561 Colusa Bear Valley Rd., 2.1 mi. from its junction with Hwy. 20 366 Comment
  UCD84444  Allophyllum gilioides Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6052 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
  RSA293146  Allophyllum gilioides J. P. Smith, James Nelson, Thomas W. Nelson 1978-4-2 9561 Colusa Bear Valley Road, 2.1 miles from its junction with State Route 20. 366 Comment
  UCD118016  Allophyllum gilioides Glen Holstein 1978-4-15 s.n. Colusa Along Bear Valley Road near Trout Creek bridge, Bear Valley. 402 Comment
  CHSC88518  Allophyllum gilioides subsp. violaceum B. Castro 2003-5-15 1438 Colusa Vicinity of Logan Ridge, Sulphur Gap and Lurline Creek. On steep SE-facing slope in opening above dirt rd paralleling a S-trending canyon. 195 Comment
  RSA783325  Allophyllum gilioides subsp. violaceum R. R. Halse 2010-3-25 7849 Colusa Along State Hwy 20 ca. 10.7 miles SW of its junction with Interstate Hwy 5 at Williams. In Salt Canyon. 154 Comment
  UC1051700  Alnus rhombifolia Helen K. Sharsmith 1953-6-21 4310 Colusa near Stonyford; Inner North Coast Ranges, Big Stoney Creek 518 Comment
  CDA11421  Alopecurus saccatus G. F. Hrusa, K. van Katwyk 1995-4-22 12142 Colusa Inner North Coast Ranges; Low wet site in full sun along N side of Leesville Rd. approx. 4 m. NW of Hwy. 20. Annual. Comment
  UCD55944  Alopecurus saccatus A. A. Beetle 1942-5-21 3276 Colusa 12 miles north of Williams. Comment
  UCD55965  Alopecurus saccatus G. F. Hrusa; K. van Katwyk 1995-4-22 12142 Colusa Inner North Coast Ranges, along north side of Leesville Rd., approx. 4 m NW of Hwy. 20. 290 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
  CAS-BOT-BC55587  Ambrosia psilostachya Roxana Stinchfield 1916-7-8 376 Colusa Along Sycamore Slough. Stinchfield Ranch Comment
  CHSC101072  Ambrosia psilostachya David W. Isle; Rhonda Isle 2007-9-9 1624 Colusa Stonyford Park at NW edge of Indian VA Elementary School; about 100 yds SE of Co. Rd 306 Stony Creek Bridge; about 1/4 mile S of Glenn Co. line. Comment
  UC1191561  Ammannia coccinea Herbert L. Mason 1945-9-19 12716 Colusa 1 mi. above Colusa (below causeway over Butte Sink spillway, e. bank Sacramento R.); Butte Sink, Sacramento R. Comment
  SEINET8237697  Ammannia coccinea John Thomas Howell 1944-7-18 19837 Colusa 3 miles west of Williams. Comment
  CHSC94478  Ammannia robusta Lowell Ahart 2006-8-9 13142 Colusa North side and just east of the bridge across Stony Creek, just north of Stonyford. 347 Comment
  POM287422  Amsinckia intermedia Lyman Benson 1935-3-27 6331 Colusa 6 miles west of Williams. 213 Comment
  RSA0090975  Amsinckia intermedia Rick Lundquist 1979-4-14 24 Colusa Bear Valley Road, 3.9 miles north of State Route 20. 412 Comment
  SD237359  Amsinckia lunaris G. K. Helmkamp, E. A. Helmkamp 2009-3-11 14368 Colusa Inner North Coast Ranges Foothills: along CA-20, 9.7 miles southwest of Williams, on the north side of Salt Creek. 162 Comment
  UC1199518  Amsinckia lunaris Annetta Carter 1938-5-8 1385 Colusa 3 mi n Leesville (on Lodoga Road) 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
  UCD80820  Amsinckia lunaris Ellen Dean, G. Harrington; K. Mawdsley, C. Thomsen, G. Walden, E. McDermott 2009-3-18 5276 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. 517 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
  CHSC82659  Amsinckia lycopsoides Tara Morgan 2002-4-6 15 Colusa This specimen was found along Bear Valley Rd. just off of Highway 20 to the north situated north of Bear Creek. Roadside. 307 Comment
  CHSC86528  Amsinckia lycopsoides B. Castro 2003-3-18 1386 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 265 Comment
  UC1178228  Amsinckia lycopsoides Peter M. Ray 1950-4-15 1712 Colusa 1.5 mi s Lodoga (road to Leesville) 381 Comment
  UC76158  Amsinckia lycopsoides Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  UCD163216  Amsinckia menziesii Craig D. Thomsen 2000-4-28 2193 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
  HSC72143  Amsinckia retrorsa J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9575 Colusa Bear Valley Rd., 2.1 mi. from its junction with Hwy. 20 366 Comment
  CHSC34508  Ancistrocarphus filagineus J. D. Prouty 1980-4-12 80 .66 Colusa Roadbank of Hwy 20 ca. 0.3 mi W of junction with Hwy 16 near Bear Creek Bridge. 320 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
  UCD56923  Ancistrocarphus filagineus Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3526 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Near headwaters of Craig Canyon. 359 Comment
  CHSC105170  Angelica tomentosa B. Castro; L. P. Janeway 1999-7-5 1013 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
  CHSC42572  Angelica tomentosa Vernon Oswald 1986-6-30 2178 Colusa Northwest side of Lily Pond near Letts Lake. 1188 Comment
  RSA0037103  Antirrhinum subcordatum David W. Isle, Rhonda Isle 2013-5-19 2039 Colusa 0.1 mi E of Maxwell Grade Summit; N of Sites Lodoga Road. July 2012 Sites Fire Area GPS (NAD27 CONUS) 10S. Comment
  UCD66699  Antirrhinum vexillocalyculatum Craig D. Thomsen 2000-6-23 2406 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  JEPS15536  Antirrhinum vexillocalyculatum subsp. breweri G. Thomas Robbins with L. R. Heckard 1956-7-25 3694 Colusa about 1.5 air mi se Snow Mt. summit (on ridge above Fouts Camp and along trail to Snow Mt, on Lake-Colusa County boundary) 1920 Comment
  JEPS127573  Antirrhinum virga David Isle 2015-6-20 2155 Colusa North Coast Ranges: ~3.75 miles W of Stonyford and ~100 yards S of road 18N01; S of Bob Angulo mobile hone; on E edge of old 4x4 road/firebreak in chaparral. (Gilmore Peak 7.5' Quad.) Comment
  JEPS127575  Antirrhinum virga David Isle 2015-6-20 2157 Colusa North Coast Ranges: ~4 miles W of Stonyford; SE of curve at culvert crossing just E of old dumpsite road junction; uphill ~200' S of 18N01 in 2012 Mill Fire area chaparral. (Gilmore Peak 7.5' Quad.) Comment
  RSA724838  Antirrhinum virga L. Ahart 2006-6-15 12792 Colusa On the west side of Forest Road 18N03, about 100 yards north of Mill Creek, near Fouts, Mill Creek Campgrounds, about 5 3/4 miles (air) west-southwest of Stonyford. 500 Comment
  SBBG119809  Antirrhinum virga L. Ahart 2006-6-15 12792 Colusa W side of USFS Rd 18N03, ca. 100 yds N of Mill Crk, near Fouts, Mill Crk Cmpgrds, ca. 5.75 air mi WSW of Stonyford 500 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
  CDA12100  Apiastrum angustifolium G. F. Hrusa 1989-5-7 6089 Colusa North Coast Ranges; N side of Little Stony Creek, approx. 3 miles upstream from junction with Stonyford-Lodoga Rd. 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
  JEPS81276  Apocynum cannabinum L. R. Heckard and J. C. Hickman 1982-7-5 5886 Colusa Summit Springs s. side of Snow Mt. (slope below (s. of) area); , Summit Springs 1500 Comment
  JEPS95645  Apocynum cannabinum Vernon H. Oswald and L. Ahart 1999-6-18 9773 Colusa Fouts Springs Rd. (M10) 9.9 mi west of Stonyford-Elk Creek Rd.: T17N R7W Sect. 7, 2050 ft, chaparral, serpentine substrate 624 Comment
  UCD66955  Apocynum cannabinum Ellen Dean; Davis Botanical Society 2008-5-31 4999 Colusa west of I-5 at Maxwell, along Goat Mountain Road following Little Stoney Creek, Little Stoney Creek Canyon. 414 Comment
  UCD23339  Aquilegia eximia A. M. Shapiro 2003-8-19 s.n. Colusa Little Stony Creek. Partly shaded serpentine riparian habitat. 475 Comment
  JEPS75709  Aralia californica Alice Q. Howard 1972-7-10 13 Colusa Paradise Creek at crossing of trail between Fouts Camp and Box Springs; Snow Mt. 1371 Comment
  CHSC28034  Arceuthobium campylopodum J. D. Jokerst 1979-3-24 180 Colusa Comment
  UCD66930  Arceuthobium campylopodum Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5079 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. In 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. Large, dammed stock pond, holding water still, in middle of meadow. Comment
  CAS-BOT-BC25251  Arctostaphylos canescens subsp. canescens Josh Suchocki; Charlene Vullo; Kyle Wear 1995-4-1 36 Colusa Walker Ridge Rd., 4.8 miles N of junction with Indian Valley Access Rd. 975 Comment
  JEPS75766  Arctostaphylos canescens subsp. canescens L. R. Heckard and R. Bacigalupi 1976-9-6 4455 Colusa trail just above Summit Springs (Colusa-Lake Co. line); Snow Mt. 1615 Comment
  UCD163029  Arctostaphylos manzanita D. O. Burge 2015-7-11 1753 Colusa Summit Springs area. 1480 Comment
  UCD84554  Arctostaphylos manzanita Ellen Dean; C. Thomsen, G. Harrington, Davis Botanical Society 2010-6-5 6080 Colusa Walker Ridge. Along Walker Ridge Road on southern part of the ridge, south of turnoff to Indian Valley Reservoir. 683 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
  HSC7627  Arctostaphylos manzanita subsp. elegans Freed W. Hoffman 1948-6-28 2439 Colusa Road between Upper and Lower Letts Valleys 1220 Comment
  CAS-BOT-BC24376  Arctostaphylos manzanita subsp. manzanita Walter Knight; Irja Knight 1964-4-11 814 Colusa Between Lewisville and Ladoga. Comment
  CAS-BOT-BC24379  Arctostaphylos manzanita subsp. manzanita A. A. Heller 1940-2-14 15499 Colusa Three mi. e. of the North Fork of Cache Creek Bridge on State Hwy #20. 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
  SEINET11263262  Arctostaphylos manzanita subsp. roofii Richard R. Halse 2014-3-25 9034 Colusa Along the Bear Valley Road ca. 1.8 miles W NW of its junction with State Hwy 20.; 0 378 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
  HSC67142  Arctostaphylos viscida J. P. Smith, Thomas W. Nelson 1976-4-14 8586 Colusa Mendocino National Forest, confluence of Stony Creek and N Fork of Stony Creek. 427 Comment
  UCD52647  Arctostaphylos viscida Roman Gankin 1958-4-26 292 Colusa In Leesville-Bartlett Springs road, ca. 2 miles west of junction of this road and Leesville-Wilbur Springs road, near Colusa-Lake County line, California. Comment
  CDA11231  Arctostaphylos viscida subsp. pulchella G. F. Hrusa 1989-2-11 5821 Colusa North Coast Ranges; Above Bear Creek, on Bear Valley Rd. approx. 1 mile N of Hwy 20. Comment
  SBBG118100  Arctostaphylos viscida subsp. pulchella C. Bornstein, E. Collins, R. Lutsko 2004-6-18 Colusa Bartlett Springs Rd, ca. 1.3 mi E of jct with Bear Valley Rd 432 Comment
  CAS-BOT-BC44549  Arctostaphylos viscida subsp. viscida Eric B. Peterson; Thomas Ward; Matt Foruria 1995-4-1 47 Colusa Walker Ridge Rd., 0.9 mile NE of junction with Indian Valley Access Rd., adjacent to Freshwater Branch Creek. 810 Comment
  SBBG25408  Arctostaphylos viscida subsp. viscida R. Gankin 1958-4-26 292 Colusa Leesville-Bartlett Springs Rd, ca. 2 mi W of jct of this rd and Leesville-Wilbur Springs Rd, near Colusa-Lake County line Comment
  HSC41876  Argemone munita subsp. rotundata Richard Runyon 1977-4-24 34 Colusa Along Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  CAS-BOT-BC401745  Argemone munita subsp. rotundata Roxana S. Ferris 1926-4-23 6455 Colusa Field at Stonyford Comment
  UC624278  Argemone rotundata L. Constance 1939-5-14 2490 Colusa 1 mi e of Mill Creek Ranger Station (Inner North Coast Ranges); Inner North Coast Ranges 548 Comment
  UCD56859  Aristida ternipes var. gentilis L. T. Burcham 1955-7-5 317 Colusa 10 miles west of Williams. 121 Comment
  CHSC87131  Aristida ternipes var. hamulosa B. Castro; Michelle Cedarborg 2003-5-6 1427 Colusa Vicinity of Logan Ridge, Sites Peak and Lurline Creek. 219 Comment
  RSA757048  Aristolochia californica Rudolf Schmid 2010-3-13 2010 -6 Colusa Cache Valley, from sandy bank on west side of Highway 16 at edge of Foothill Woodland, a few kilometers north of county line. 169 Comment
  CAS-BOT-BC82672  Arnica longifolia G. Thomas Robbins; L. R. Heckard 1956-7-25 3712 Colusa Along edge of Dark Hollow Creek (a tributary of Middle Fork Stony Creek), on southern flank of Snow Mt. East, 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
  JEPS104400  Artemisia douglasiana Lowell Ahart 2003-10-23 10660 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
  UCD66528  Arundo donax Craig D. Thomsen 2000-4-28 2229 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 2.80. Along Bear Creek at base of Hwy 20 fill-slope, adjacent to massive valley oak. 300 Comment
  HSC45677  Asclepias cordifolia Stephen Plant 1978-4-22 215 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  CHSC71414  Asclepias fascicularis Vernon H. Oswald; Lowell Ahart 1998-7-15 9266 Colusa Bartlett Springs Rd. 1.6 mi west of Bear Valley Rd. 487 Comment
  POM129846  Asclepias fascicularis Roxana Stinchfield 1916-7-11 s.n. Colusa Davis Tule, near Sycamore Slough. Comment
  UCD121317  Asclepias fascicularis V. C. Bryant 1926-6-8 s.n. Colusa Colusa. Comment
  CAS-BOT-BC222852  Asclepias solanoana Volney Rattan 1884-6-1 s.n. Colusa Above Fonts Springs, Colusa, Coast Mts. North of San Francisco Bay Comment
  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
  UCD104677  Astragalus clevelandii K. Esau; D. Hartmann 1941-7-17 s.n. Colusa Between Williams and Clear Lake, U.S. #20. Comment
  CAS-BOT-BC366914  Astragalus gambelianus Richard R. Halse 2013-3-27 8765 Colusa Along State Hwy. 20 just east of the Colusa/Lake County Line, ca. 14.6 miles E of the junction of State Hwys. 20 and 53 558 Comment
  CDA11399  Astragalus gambelianus G. F. Hrusa, K. van Katwyk 1995-4-22 12119 Colusa Inner North Coast Ranges; Walker Ridge Road, approx. 6 m. S of intersection with Bartlett Springs Rd. Comment
  HSC47646  Astragalus gambelianus J. P. Smith, J. O. Sawyer 1978-4-29 9790 Colusa Just W of Walker Ridge Rd. intersection with Bartlett Springs Rd. Comment
  CHSC46306  Astragalus rattanii var. jepsonianus Vernon Oswald 1986-5-12 2006 Colusa Brim Rd. (Bartlett Springs Rd.) 1.8 mi w of Bear Valley Rd. 502 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
  RSA475238  Astragalus rattanii var. jepsonianus Aaron Liston, Sara Meury 1988-5-31 751 -1 Colusa Bear Valley; 8.1 miles N of Hwy 20. 400 Comment
  UCD105314  Astragalus rattanii var. jepsonianus J. M. Tucker; Dorothy Dreyfus 1967-4-29 4034 Colusa Bear Valley, 9 miles north of junction of Bear Valley Road with State Highway 20. 403 Comment
  UCD63037  Astragalus rattanii var. jepsonianus Ellen Dean; Marjorie Phan and Gerald Dickinson 2008-4-27 4883 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Along unnamed tributary of Bear Creek. 322 Comment
  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
  RSA670513  Atriplex cordulata Stan C. Spencer 2002-8-8 unnumbered Colusa ca. 3-6 miles E of Colusa, along California Highway 20. 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
  CHSC80183  Atriplex fruticulosa B. Castro; G. Kuenster 2000-7-19 1208 Colusa Vicinity of Maxwell, Funks Creek, and the Glenn-Colusa canal, on low terrace beside S edge of shallow intermittent stream channel draining eastward out of the hills east of Golden Gate. 42 Comment
  RSA747234  Atriplex fruticulosa George K. Helmkamp, E. Helmkamp 2008-10-14 14250 Colusa Sacramento Valley: along CA-20, 0.2 mile east of the Sutter County Line 9 Comment
  CHSC61038  Atriplex joaquinana Vernon H. Oswald; Mike Wolder, Joe Silveira 1993-7-26 5702 Colusa Colusa National Wildlife Refuge. W side of Pool 3 on the S end of the refuge near Ohm Rd., ca. 2 mi N of Ware Rd., ca. 5 mi S of Colusa. 15 Comment
  POM164903  Atriplex joaquinana Roxana S. Ferris 1917-4-12 505 Colusa 4 miles east of Williams. Comment
  UCD163708  Atriplex joaquinana Craig Thomsen 1999-5-10 2020 Colusa Colusa County. At confluence of Sulphur Creek and Bear Creek. About 3 miles north of Hwy 20. Comment
  CHSC59712  Atriplex persistens K. R. Stern 1980-6-30 6646 Colusa Vernal pool, south central border area of Colusa National Wildlife Refuge. 45 Comment
  UC40790  Atriplex semibaccata J. Burtt Davy May 1898 4287 Colusa Maxwell Comment
  UC217003  Atriplex serenana var. serenana H. M. Hall 1920-7-12 11011 Colusa 5 mi e Maxwell; e of Maxwell Comment
  UC72556  Atriplex serenana var. serenana H. P. Chandler 1905-9-14 Colusa Princeton 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
  CAS-BOT-BC98202  Baccharis salicifolia Alice Eastwood 1921-4-11 10231 Colusa Colusa Comment
  CHSC98782  Baccharis salicifolia Richard R. Halse 2007-3-25 7134 Colusa Along State Hwy. 20 ca. 7.8 miles northeast of its junction with State Hwy. 16, at base of Salt Canyon. Along Salt Creek. 100 Comment
  SEINET7239582 Image available Baccharis salicifolia R. R. Halse 2007-3-25 7134 Colusa Along State Hwy. 20, ca. 7.8 miles NE of its junction with State Hwy. 16 at base of Salt Canyon 100 Comment
  UCD57629  Baccharis salicifolia Michele Lanctot; with Plant Biology 102 2007-4-29 5 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central part of ranch. Thompson Canyon. In the middle of a creek bed. 361 Comment
  UCD74309  Balsamorhiza macrolepis G. Ledyard Stebbins 1971-6-6 s.n. Colusa Walker Ridge Rd., 1/4 mile S of Bartlett Springs Rd. 701 Comment
  CDA396  Bassia hyssopifolia L. Ahart 2003-8-15 10509 Colusa On the south side oof Highway 20, about 1 mile southwest of Williams. Comment
  UCD97560  Bassia hyssopifolia P. B. Kennedy 1928-9-15 s.n. Colusa Cortena. 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
  HSC90794  Bergia texana Barbara Ertter, Elizabeth Neese, Laura Fujii, Dawn Espindola 1989-10-21 8869 Colusa SE end of E Park Reservoir N of Lodoga 366 Comment
  JEPS104404  Bergia texana Lowell Ahart 2003-10-23 10670 Colusa On the e strand 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
  RSA724819  Bidens frondosa L. Ahart 2006-9-26 13344 Colusa South side of the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5.5 miles east of Maxwell. 24 Comment
  CHSC96369  Boehmeria cylindrica D. Koenig; L. Bateman 2006-10-13 Colusa Sacramento Valley. By a slough along the west side of the Sacramento River, about 0.5 mi south-southeast of Stegeman. 21 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
  POM262504  Boisduvalia densiflora Milo S. Baker 1941-7-26 10132 Colusa Bear Valley along road. Stonyford to Williams highway Comment
  UCD140003  Bolboschoenus fluviatilis V. C. Bryant 1929-8-23 s.n. Colusa Colusa. 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
  CHSC84931  Bolboschoenus glaucus Lowell Ahart 2003-10-23 10672 Colusa Along Squaw Creek, just south of East Park Reservoir, about 1/8 mile northwest of Sites Lodoga Road, about 1 mile north of Lodoga, about 21 miles west of Maxwell. 368 Comment
  CHSC57146  Bolboschoenus maritimus K. R. Stern 1980-6-1 6641 Colusa Vernal pool, south-central border area of Colusa Wildlife Refuge. 45 Comment
  CAS-BOT-BC31370  Bolboschoenus maritimus Roxana S. Ferris 1926-4-22 6283 Colusa Roadside ditch 3 miles west of Colusa. Comment
  UCD163660  Bolboschoenus maritimus subsp. paludosus Craig Thomsen 1998-6-10 1959 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCD67058  Bolboschoenus maritimus subsp. paludosus Craig D. Thomsen 2008-5-23 2755 Colusa BLM Payne Ranch. Destanella Flat, just south of Hwy 20, 2.5 miles west of Hwy 16. 522 Comment
  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
  CAS-BOT-BC127866  Brickellia greenei Mark A. Elvin; Mark S. Brunell; David Isle 2006-8-3 5034 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
  UCR206363  Brodiaea elegans George K. Helmkamp, E. A. Helmkamp 2009-5-20 14747 Colusa Inner North Coast Ranges, along CA-16 at 'Cowboy Camp' 1.0 mile south of the junction with CA-20, adjacent to Bear Creek 332 Comment
  JEPS81271  Brodiaea elegans subsp. elegans L. R. Heckard and J. C. Hickman 1982-7-5 5879 Colusa slope below (s of) area Summit Springs (s side of Snow Mountain); s side Snow Mountain 1500 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
  HSC3023  Brodiaea elegans subsp. elegans Annetta Carter 1953-6-20 3240 Colusa Near summit E of Hough Springs on Bartlett Springs Rd. 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
  SBBG115860  Bromus arenarius B. Crampton 1958-5-19 4793 Colusa ca. 10.1 mi SE of Leesville, E of foothills known as Three Sisters Comment
  SEINET10822097  Bromus arenarius Lowell Ahart 2006-8-22 Ahart 13216 Colusa T18N, R6W, between the southwest 1/4 and southeast 1/4 of Section 29. South side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford. 349 Comment
  UCD37189  Bromus arenarius Beecher Crampton 1958-5-19 4802 Colusa Colusa County, 5.8 miles south of Lodoga. Comment
  HSC98348  Bromus diandrus Brent Helm, Curtis Miller, Mark Steiger 1988-4-16 63 Colusa Stonyford, off side road underneath Blue Oaks 366 Comment
  JEPS81283  Bromus diandrus L. R. Heckard and J. C. Hickman 1982-7-5 5894 Colusa s side of Snow Mountain, Summit Springs Summit Springs; Snow Mountain, Summit Springs 1500 Comment
  CHSC6680  Bromus hordeaceus Marilyn Lee 1968-4-30 168 Colusa North side of Hwy. 16, intersection of Hwy. 16 and Hwy. 20, between Hwy. and Cache Creek. Comment
  UCD84558  Bromus hordeaceus Ellen Dean; C. Thomsen, G. Harrington, Davis Botanical Society 2010-6-5 6083 Colusa Walker Ridge. Along Walker Ridge Road, N of turnoff to Indian Valley Reservoir but S of Til Jones Springs. Many old undeveloped roads here. 817 Comment
  SEINET10514562  Bromus hordeaceus Roxana S. Ferris 1917-4-12 Ferris 527 Colusa 4 miles E of Williams. Alkali Plains. Comment
  JEPS94210  Bromus laevipes Vernon Oswald and Lowell Ahart 1998-5-7 8997 Colusa Bartlett Springs Road 1.6 mi w of Bear Valley Road; Bartlett Springs Road 487 Comment
  UCD58884  Bromus laevipes Helen K. Sharsmith 1953-6-19 4266 Colusa Inner North Coast Ranges. Mendocino National Forest. Red Bridge Camp. Near confluence of North and Middle forks of Stoney Creek. 548 Comment
  UCD66569  Bromus laevipes Craig D. Thomsen 2001-5-24 2531 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
  UCD72529  Bromus laevipes Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3820 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 along trail that begins approximately opposite the BLM parking lot near south end of bridge. Approx. 0.75 mile along trail. 286 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
  SEINET4404370  Bromus rubens R. R. Halse 2002-3-21 6130 Colusa Williams; by junction on 5th Street and B Street; 24 Comment
  UC1543019  Bromus tectorum Donald G. Nelson et. al. 1940-6-8 686 Colusa w boundary Snow Mountain, east not far from summit Snow Mountain; w boundary Snow Mountain 1981 Comment
  UCD59764  Bromus tectorum Beecher Crampton 1958-5-19 4808 Colusa West of Lodoga. Comment
  UCD65632  Bromus tectorum Craig D. Thomsen 2000-4-12 2133 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
  UCD65639  Bromus tectorum Craig D. Thomsen 2000-4-28 2174 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
  UCD129652  Cacaliopsis nardosmia J. M. Tucker 1959-5-30 3519 Colusa Trough Spring, at northeast end of Trough Spring Ridge, ca. 5.75 miles (airline) southwest of Stonyford. 975 Comment
  CDA42953  Calandrinia breweri L. 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. Comment
  HSC72159  Calandrinia ciliata J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9534 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  RSA783301  Calandrinia ciliata R. R. Halse 2010-3-20 7825 Colusa Along State Hwy 45 ca. 10 miles N of Colusa (junction of State Hwys 45 & 20). 22 Comment
  UCR73129  Calandrinia ciliata Mark Hershkovitz 1991-5-3 s.n. Colusa Bear Valley, along Bear Valley Rd. Near fenceline in central region of valley Comment
  SEINET9097491  Calandrinia ciliata var. menziesii R. R. Halse 2010-3-20 7825 Colusa Along State Hwy 45 ca 10 miles N of Colusa (junction of State Hwys 45 & 20). 22 Comment
  UCD159532  Calendula officinalis D. S. Park 2011-4-11 280 Colusa Disturbed agricultural field off Boles Rd. Comment
  CHSC2225  Calochortus amabilis V. Holt 1946-4-18 Colusa Cache Creek. 243 Comment
  JEPS122382  Calochortus amabilis Nisrine Machaka-Houri with Gracie Benson-Martin 2014-5-3 NG 2 Colusa Bear Valley Road 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
  UC725389  Calochortus amabilis A. A. Heller 1940-5-6 15577 Colusa 2 mi w Highway 16 junction with State Highway 20 (on State Highway 20) Comment
  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
  CAS-BOT-BC492123  Calochortus amabilis A. A. Heller 1940-5-6 15577 Colusa 2 miles west of Junction with Highway #16, on State Highway #20 Comment
  SJSU9982  Calochortus luteus E. O. Haas 1956-5-12 69 Colusa Salt Creek c. 10 mi SW of Arbuckle Comment
  CHSC112206  Calochortus splendens Lowell Ahart 2013-5-1 18683 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 mile (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  CHSC28483  Calochortus splendens Timothy Spira; Robert Schlising 1978-5-13 3247 Colusa Ca. 0.5 mi NW jct Hwy 20 and Bear Valley (=Wilber Springs) Road, along latter. Comment
  RSA0118781  Calochortus splendens Lowell A. Ahart 2013-5-1 18683 Colusa On the north side of the wash, north side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 567 Comment
  UCR228282  Calochortus splendens Ellen Dean, Gordon Harrington, Craig D. Thomsen, S. Harrison 2008-5-18 4948 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 20 402 Comment
  JEPS81411  Calochortus splendens L. R. Heckard and J. C. Hickman 1982-7-9 6019 Colusa near Horse Glade and road to Lookout junction (along road to Lookout, Goat Mt., Colusa-Lake County boundary) 1737 Comment
  UC1051717  Calochortus superbus Helen K. Sharsmith 1953-6-19 4269 Colusa near North and Middle Forks of Stony Creek confluence; Inner North Coast Ranges, Mendocino National Forest 548 Comment
  UCD66859  Calochortus superbus Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5062 Colusa BLM Payne Ranch. Lands to the southwest of the intersection of Hwy 16 and Hwy 20. Destinella Flat, on the west side of main drainage. 579 Comment
  UC1051690  Calochortus tolmiei Helen K. Sharsmith 1953-6-19 4289 Colusa Old Mill Campground, Trough Springs Ridge Inner North Coast Ranges, Mendocino National Forest 1219 Comment
  CHSC82628  Calochortus uniflorus Tara Morgan 2002-4-1 18 Colusa Found in Bear Valley located west of Highway 5 and north of Highway 20 within pastures. 385 Comment
  UCD83629  Calochortus uniflorus Fanny Ye; with PLB 102 class 2010-5-2 1 Colusa E slope of Walker Ridge. Eaton Springs. On edge of campsite/parking area. 709 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
  JEPS120714  Calycadenia pauciflora Lowell Ahart 2013-10-1 19069 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
  RSA255585  Calycadenia pauciflora Gerald D. Carr 1972-6-14 703 Colusa At the Lake County line on Hwy. 20 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
  UCD63726  Calycadenia pauciflora Craig D. Thomsen 2008-5-23 2737 Colusa BLM Payne Ranch. Southwest of intersection of Hwy 16 and Hwy 20. 0.5 mile south of Hwy 20 (south of Destanella Flat), about 2.5 miles west of Hwy 16. 542 Comment
  UCD84638  Calycadenia pauciflora G. Harrington 2009-7-7 85 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
  UCR228277  Calycadenia pauciflora Ellen Dean, Davis Botanical Society 2008-5-31 4992 Colusa West of Hwy I-5 at Maxwell, along Goat Mountain Road, immediately west of the junction with Lodoga-Stonyford Road 383 Comment
  CAS-BOT-BC270744  Calycadenia pauciflora Gerald D. Carr 1972-7-29 722 Colusa 1.8 miles E of Walker Ridge Road on Deadshot Road, Deadshot Flat 731 Comment
  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
  RSA255514  Calycadenia pauciflora Gerald D. Carr 1971-9-15 658 Colusa 6 miles north of Yolo County Line on Hwy. 16 Comment
  RSA255559  Calycadenia pauciflora Gerald D. Carr 1972-7-29 721 Colusa 3.1 miles south of Bartlett Springs road on Walker Ridge Road, Buck Flat 869 Comment
  RSA255605  Calycadenia pauciflora Gerald D. Carr 1971-7-29 607 Colusa 5.2 miles west of Stoneyford on road to Fout Spr. 610 Comment
  UC1876242  Calycadenia pauciflora Gerald D. Carr 1972-8-2 723 Colusa 0.6 mi W of Leesville-Lodoga Rd. on road to Cooks Springs. Comment
  UC1876244  Calycadenia pauciflora Gerald D. Carr 1972-7-29 722 Colusa 1.8 mi E of Walker Ridge Rd. on Deadshot Rd. 731 Comment
  UC1876636  Calycadenia pauciflora Gerald D. Carr 1971-9-14 651 Colusa 2.0 mi SW of Leesville on road to Bartlett Spr. Comment
  UC1971691  Calycadenia pauciflora 1978-8-20 2156 Colusa Bear Valley Road, 0.1 mi N of jct with Brim Road (to Bartlett Springs), ca. 2 mi SW of Leesville (=GDC 651) 482 Comment
  UC1971757  Calycadenia pauciflora R. L. Carr 1997-7-18 3352 Colusa E of Clearlake Oaks, 1.8 mi E of Lake/Colusa Co. line on Hwy 20 Comment
  UCD129804  Calycadenia pauciflora Gerald D. Carr 1971-7-29 605 Colusa 1.7 miles west of Lodoga on road to Stoneyford. 411 Comment
  UCD129807  Calycadenia pauciflora Gerald D. Carr 1971-7-29 608 Colusa 1 miles south of Stoneyford on road to Lodoga. 365 Comment
  UCD129835  Calycadenia pauciflora Gerald D. Carr 1972-7-29 717 Colusa 8.7 miles north of Highway 20 on Bear Valley Road, Bear Creek. Comment
  UCSB6412  Calycadenia pauciflora Keator, Glenn 1958-6-16 Colusa Along road from Lower Lake to Sacramento Valley just east of Lake-Colusa county line Comment
  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
  UC1543009  Calycanthus occidentalis Donald G. Nelson et. al. 1940-6-9 694 Colusa Happy Creek Camp Stony Creek, Paradise Creek (on Paradise Creek, which empties into middle fork of Stony Creek, nw corner of Colusa County) 731 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
  UCD163878  Calystegia collina Craig D. Thomsen 2001-5-24 2534 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 1 mile west of Hwy 20/16 instersection. Comment
  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
  UCD57719  Calystegia collina subsp. collina Jordan Thompson; with Plant Biology 102 2007-4-29 2 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central/Eastern part of ranch. Craig Canyon. North side of Craig Creek on south side of unimproved road. 335 Comment
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Feb 20 2009
  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
  JEPS94202  Calystegia collina subsp. oxyphylla Vernon Oswald and Lowell Ahart 1998-5-7 9000 Colusa Bartlett Springs Road 2.1 mi w of Bear Valley Road (0.8 mi e of Sawtelle Valley and Grapevine Flat Roads); Bartlett Springs Road 524 Comment
  UCD84443  Calystegia collina subsp. oxyphylla Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6051 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
  JEPS81301  Calystegia occidentalis subsp. occidentalis L. R. Heckard and J. C. Hickman 1982-7-5 5915 Colusa slope below Summit Springs, S side Snow Mountain Comment
  RSA261450  Camassia leichtlinii subsp. suksdorfii J. M. Tucker, L. K. Mann 1959-5-30 3531 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
  UC1614405  Camissonia Charles M. Belshaw 1937-4-25 2831 Colusa Inner North Coast Range, Cooks Springs, Devils Ridge Devils Ridge; Inner North Coast Range, Cooks Springs, Devils Ridge Comment
  UC71985  Camissonia contorta Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  CHSC112226  Camissoniopsis hirtella Lowell Ahart 2013-5-1 18671 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
  CHSC112316  Campanula griffinii Lowell Ahart 2013-5-1 18690 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
  UCD64045  Capsella bursa-pastoris Craig D. Thomsen 2000-3-8 2037 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
  UCR206868  Capsella bursa-pastoris George K. Helmkamp, E. A. Helmkamp 2009-1-31 14315 Colusa Sacramento Valley, junction of Moon Bend Road and CA-20 at the south end of the city of Colusa 23 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
  CAS-BOT-BC19165  Carex barbarae Roxana S. Ferris 1926-4-22 6315 Colusa Near Sycamore. Comment
  POM163445  Carex barbarae Roxana S. Ferris 1926-4-22 6315 Colusa Near Sycamore. Comment
  CHSC79590  Carex bolanderi L. P. Janeway 2000-5-31 6772 Colusa High North Coast Ranges. At Trough Spring; about 8.9 km southwest of Stonyford. 1049 Comment
  CHSC92529  Carex feta G. F. Hrusa; WTD 1998-6-19 14619 Colusa Wet area on spring along Goat Mtn. Rd. below intersection with USFS Pacific Ridge Rd. (M5). 975 Comment
  UCD63112  Carex praegracilis Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4943 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20. 384 Comment
  CAS-BOT-BC118348  Carex praegracilis Roxana S. Ferris 1917-4-17 625 Colusa Under trees, Sycamore Slough. Comment
  CHSC45069  Carex serratodens Vernon Oswald 1984-5-2 1169 Colusa Mendocino Nat. Forest, Fouts Spring Rd. (M10; 18N01) 5.9 mi w of Stonyford. 609 Comment
  CHSC79853  Carex serratodens L. P. Janeway 2000-5-31 6771 Colusa High North Coast Ranges. At Trough Spring; about 8.9 km southwest of Stonyford. 1049 Comment
  CHSC91581  Carex serratodens Barbara L. Wilson; R. Brainerd, D. Isle, L. Janeway, M. Mooers 2002-6-28 10703 Colusa Kanaka Glade; UTM 10S 536346e 4339859n. 986 Comment
  UCD67061  Carex serratodens Craig D. Thomsen 2008-3-20 2715 Colusa BLM Payne Ranch. Lands to the SW of Hwy 20/16 intersection. South side of Hwy 20, about 0.5 mile west of Hwy 16/20 intersection, at Colusa Co. milepost 2.63. 500 Comment
  UCD82442  Carex serratodens Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5666 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
  UCD82514  Carex serratodens Craig Thomsen; G. Harrington 2009-5-12 2872 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  UCR228280  Carex serratodens Ellen Dean, Gordon Harrington, Craig D. Thomsen, S. Harrison 2008-5-18 4946 Colusa Payne Ranch, owned by BLM, lands to the southwest of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20 399 Comment
  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
  CAS-BOT-BC116775  Carex subfusca Peter H. Raven; R. Snow 1959-9-11 14422 Colusa Along stream in wet soil, Bonnie View. 914 Comment
  CHSC92497  Carex tumulicola G. F. Hrusa; WTD 1998-6-19 14635 Colusa Occasional on stream/seep near Goat Mtn. summit, adj. to intersection at Lake Co. boundary. NW side of summit area. 1710 Comment
  CAS-BOT-BC249072  Castilleja affinis Roxana S. Ferris 1926-4-23 6585 Colusa 2 miles from Stonyford Comment
  CAS-BOT-BC230061  Castilleja applegatei Ellen Dean; C. Thomsen; G. Harrington; R. Wenk 2010-6-2 6046 Colusa Walker Ridge. Along Walker Ridge Road, N of turnoff to Indian Valley Reservoir but S of Til Jones Spring 817 Comment
  HSC45686  Castilleja applegatei Patricia Shesgreen 1978-4-22 38 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  UC2014139  Castilleja applegatei Ellen Dean, C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6046 Colusa Colusa County. Walker Ridge. Along Walker Ridge Road, N of turnoff to Indian Valley Reservoir but S of Til Jones Spring. Many old undeveloped roads here. 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
  HSC71313  Castilleja applegatei subsp. martinii Thomas W. Nelson, Jane P. Nelson 1979-4-11 4612 Colusa Along Leesville to SR 20 cutoff 5 mi. E of Leesville Comment
  SBBG128982  Castilleja attenuata G. K. Helmkamp, E. A. Helmkamp 2011-4-1 17122 Colusa Antelope Valley, along Maxwell-Sites Rd, 1.8 mi SE of Sites 77 Comment
  UC76125  Castilleja attenuata Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley 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
  CDA32834  Castilleja exserta P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  CHSC115373  Castilleja exserta subsp. exserta Lowell Ahart 2015-4-10 20026 Colusa Normal size plants, on dry grassy soil. 407 Comment
  CHSC89874  Castilleja exserta subsp. exserta B. Castro; S. Innecken 2001-3-26 1218 Colusa Vicinity of Sites, in rolling hills near Sulphur Gap, among unnamed tributaries to Lurline Creek, in heavily grazed annual grassland E of blue oak savanna. On top of small knoll. 91 Comment
  HSC96792  Castilleja exserta subsp. exserta J. Carey, A. Hong, J. Leffingwell 1995-4-1 29 Colusa Bear Valley Rd., 1.2 mi. S of its junction with Brim Rd. 415 Comment
  JEPS10303  Castilleja exserta subsp. exserta W. L. Jepson 1932-5-8 16282 Colusa Stonyford 365 Comment
  JEPS58564  Castilleja exserta subsp. exserta Rimo Bacigalupi 1969-4-13 9325 Colusa floor of Bear Valley, along county road on boundary between Townships 15N and 14N Bear Valley Comment
  HSC85948  Castilleja exserta subsp. exserta Michalski, Raum, Hopson 1987-4-21 58 Colusa Leesville Rd. Comment
  CHSC110845  Castilleja foliolosa David Isle; Rhonda Isle 1989-4-29 2000 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). 382 Comment
  CHSC112412  Castilleja foliolosa Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18642 Colusa Rocky serpentine outcrop on the north side of State Highway 20, just east of Lake County Line, 12.2 mile (air) east-northeast of Clear Lake (town), 17.1 miles west of Williams. 566 Comment
  CHSC114943  Castilleja foliolosa Lowell Ahart 2015-4-10 20014 Colusa On the northside of Brim Road, about 2 miles west of the intersection of Bear Valley Road and Brim Road, about 17 miles (air) west of Williams. Chaparral. 500 Comment
  CHSC115391  Castilleja foliolosa Lowell Ahart 2015-4-1 19988 Colusa Along 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
  JEPS8775  Castilleja foliolosa Alice King May 1906 Colusa College City Comment
  RSA589920  Castilleja foliolosa Michael A. Vincent, Robert M. Rhode 1996-3-30 7297 Colusa Along Brim Rd., 1.9 mi. W jct. Bear Valley Rd. Comment
  UCR225396  Castilleja foliolosa Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5092 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20. Western side of ranch along trail that follows the border of Lake and Colusa counties. South of Dunsfield Flat 648 Comment
  HSC97657  Castilleja foliolosa Danny Pineda 2001-4-21 7 Colusa Found at Walker Ridge area 671 Comment
  SBBG128775  Castilleja foliolosa L. Ahart 2013-4-26 18642 Colusa rocky serpentine outcrop on the N side of State Hwy 20, just E of Lake County Line, 12.2 mi (air) ENE of Clear Lake (town), 17.1 mi (air) W of Williams 566 Comment
  JEPS80826  Castilleja miniata L. R. Heckard and J. C. Hickman 1981-7-31 5798 Colusa e side Snow Mt. (Dark Hollow Creek); , Dark Hollow Creek 1615 Comment
  JEPS82554  Castilleja miniata L. R. Heckard 1983-7-27 6101 Colusa ca 2 mi w Stonyford road; Little Stony Creek 411 Comment
  UCD148585  Castilleja miniata G. F. Hrusa 1994-11-7 11991 Colusa Frenzel Creek Research Natural Area. Little Stony Creek, approximately 2 miles above Stonyford-Lodoga Rd. on Goat Mountain Road. 134 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
  JEPS121787  Castilleja miniata subsp. miniata David Isle 2013-8-23 2049 Colusa COLUSA County, CA. W bankSalt Ck, ~ 150' NE of Dannis Dr Bridge on Isle Property. Comment
  CHSC71451  Castilleja minor subsp. spiralis Vernon H. Oswald; Lowell Ahart 1998-7-15 9271 Colusa Bartlett Springs Rd. 1.6 mi west of Bear Valley Rd. 487 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
  UCD163343  Castilleja minor subsp. spiralis Craig D. Thomsen 2007-7-31 s.n. Colusa Walker Ridge. East of Eaton Springs en route to Rathburn Mine. Comment
  UCR37942  Castilleja rubicundula subsp. lithospermoides P. Williams, Brian Kearney, Mike Malamus 1984-4-28 74 Colusa 2.9 mi west of Leesville Lodoga Junction on Brim Road. 418 Comment
  JEPS11156  Castilleja rubicundula subsp. rubicundula W. L. Jepson 1932-5-8 16284 Colusa Stonyford; w Colusa County 365 Comment
  JEPS33902  Castilleja rubicundula subsp. rubicundula D. E. Breedlove 1963-5-30 5183 Colusa 17 mi e Bartlett Springs (on floor of Bear Valley); Bear Valley 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
  UC1282150  Castilleja rubicundula subsp. rubicundula Annetta Carter and Louise Kellogg 1953-6-20 3239 Colusa 6 mi n Wilbur Springs Junction (road to Leesville); Inner North Coast Ranges 400 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
  UC584134  Castilleja rubicundula subsp. rubicundula J. Clausen 1935-5-20 1018 Colusa ca 27 mi w Williams (past the Wilbur Springs road, along Bear Creek); Bear Creek Comment
  UC903276  Castilleja rubicundula subsp. rubicundula Ethel Crum 1932-5-7 1458 Colusa Lodoga Comment
  UCD123057  Castilleja rubicundula subsp. rubicundula John M. Tucker 1980-5-3 4444 Colusa Bear Valley, 4.3 mi. south of junction of Brim Road and Bear Valley Road. 396 Comment
  UCD82578  Castilleja rubicundula subsp. rubicundula Craig Thomsen 2008-6-12 2768 Colusa Bear Creek (formerly Payne) Ranch. South side of Hwy 20, ca. 0.25 mi W of Hwy 16. West and SW of the corral that is located at the junction of Hwy 16 and 20. Comment
  UCD56927  Caulanthus flavescens Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3530 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Saddle between Craig and Thompson Canyons. 394 Comment
  UCD170130  Caulanthus lasiophyllus Jack Alderson 2016-5-1 s.n. Colusa BLM Bear Creek Ranch (formerly Payne Ranch); 2400 feet (730 m) west of the confluence of Brophy Creek with Bear Creek. 341 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
  CAS-BOT-BC40507  Caulanthus lasiophyllus Roxana S. Ferris 1917-4-12 504 Colusa 4 miles east of Wiliams. Comment
  RSA399079  Ceanothus cuneatus Carolyn Sanford 1977-4-24 352 Colusa Above Barrel Springs Campground. 701 Comment
  UCD33934  Ceanothus cuneatus Beecher Crampton 1975-4-21 9165 Colusa Colusa County, 4 miles N.N.E. of Lodoga, grapevine summit. Comment
  HSC98203  Ceanothus cuneatus Steven Lagos 1974-5-4 50 Colusa 915 Comment
  CAS-BOT-BC50803  Ceanothus integerrimus Brent Helm; Curtis Miller; Mark Steiger 1988-4-16 74 Colusa 2.4 miles west on Goat Mountain Rd., off of Lodoga-Stonyford Rd. 441 Comment
  UCD170260  Ceanothus integerrimus D. O. Burge 2016-11-3 2185 Colusa Fouts Springs area, roadside on Forest Road M10, E of Fouts Springs. 630 Comment
  UCD170262  Ceanothus integerrimus D. O. Burge 2016-11-3 2186 Colusa Fouts Springs area, roadside on Forest Road M10, E of Fouts Springs. 610 Comment
  UCD170264  Ceanothus integerrimus D. O. Burge 2016-11-3 2188 Colusa Walker Ridge, E of Indian Valley Reservoir, roadside on Bartlett Springs Road. 980 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
  UCD82544  Ceanothus integerrimus Ellen Dean; G. Harrington, C. Thomsen,R. Wilmarth,Chiao-Yi Cheng 2009-5-20 5699 Colusa Walker Ridge. Along Walker Ridge just S of turn-off to picnic area near Cold Spring. 1007 Comment
  SEINET11191747  Ceanothus integerrimus C. L. Schmidt 1989-5-6 1244 Colusa Between Stonyford and Fouts Springs. 600 Comment
  UCD112067  Ceanothus jepsonii D. Sanchez-Mata 1996-7-3 s.n. Colusa Williams. Walker Ridge. Wilburg Springs-Wintun Camp. 850 Comment
  HSC98207  Ceanothus oliganthus var. sorediatus Steven Lagos 1974-5-4 43 Colusa 747 Comment
  JEPS110383  Centaurea solstitialis Lowell Ahart 2006-8-9 13148 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  CAS-BOT-BC284462  Centaurea solstitialis Roxana Stinchfield 1916-7-12 474 Colusa Street - College City Comment
  CHSC107286  Centaurium tenuiflorum L. P. Janeway; B. Castro 2011-7-9 10512 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. South end of the area near the Canal fence;. upland grassland along dirt road route (into the beehive area). 51 Comment
  JEPS94758  Centaurium trichanthum Vernon H. Oswald and Lowell Ahart 1998-7-15 9267 B Colusa Bartlett Springs Road 1.6 mi w of Bear Valley Road 487 Comment
  RSA92959  Centaurium trichanthum Milo S. Baker 1941-7-8 10115 Colusa Colusa County: roadside ditch Bear Valley in adobe, S of Lodoga Comment
  JEPS68349  Centromadia fitchii L. R. Heckard with R. Bacigalupi and B. Doren 1971-9-9 2789 Colusa on Ladoga rd about 3 mi s Stonyford 335 Comment
  UCD61474  Centromadia parryi subsp. parryi Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3920 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Just west of parking lot on west side of Bear Creek. 312 Comment
  CHSC107937  Centromadia parryi subsp. rudis B. Castro; L. Janeway 2011-7-9 1898 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; approximately 1 mi southeast of Funks Reservoir and 900 ft northeast of Tehama-Colusa Canal. Off northern edge of large +- alkaline marsh. 49 Comment
  JEPS118719  Centromadia parryi subsp. rudis B. Castro with Amy Lyons 2011-8-3 1903 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley approximately 1 mi southeast of Funks Reservoir and 800 ft northeast of Tehama-Colusa Canal. Sites 7.5' quad. Comment
  UC71767  Centromadia parryi subsp. rudis H. P. Chandler 1905-9-14 Colusa Princeton Comment
  UC727676  Centromadia parryi subsp. rudis Milo S. Baker 1946-9-5 11624 Colusa 3 mi w of Colusa; Williams Comment
  UCD162396  Centromadia parryi subsp. rudis Juliette Robinson 2013-10-8 2 Colusa Along Highway 20, just east of I-5. 19 Comment
  UCD77502  Centromadia parryi subsp. rudis Robert E. Preston 1999-9-24 1242 Colusa Antelope Valley, at head of Salt Canyon. 219 Comment
  CAS-BOT-BC279209  Centromadia pungens subsp. pungens Roxana Stinchfield 1916-7-8 380 Colusa Along Sycamore Slough - Stinchfield Ranch Comment
  CAS-BOT-BC279208  Centromadia pungens subsp. pungens A. A. Heller 1916-6-9 12391 Colusa Along the state highway near Colusa Comment
  CAS-BOT-BC279210  Centromadia pungens subsp. pungens David D. Keck 1933-5-30 2402 Colusa 1.8 miles west of Colusa on road to Williams Comment
  CHSC105205  Centromadia pungens subsp. septentrionalis K. R. Stern 1980-6-1 6643 Colusa Vernal pool, south central border area of Colusa National Wildlife Refuge. 45 Comment
  RSA46869  Cerastium arvense Doris K. Kildale 1927-04 3245 Colusa Stony Ford. Comment
  CAS-BOT-BC207753  Cercis occidentalis Roxana S. Ferris 1926-4-23 6432 Colusa Hillside near Stonyford. Comment
  CAS-BOT-BC293729  Cercis occidentalis Mona Bourell 1997-3-29 5771 Colusa Mendocino National Forest, Dixie Glade Campground 918 Comment
  HSC31623  Cercis occidentalis Glenn McGourty 1974-4-20 7 Colusa Roadcut of Hwy. 16, 17 mi. E of Esparto Comment
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Aug 13 2014
  RSA0034161  Cercis occidentalis M. Bourell 1997-3-29 5771 Colusa Mendocino National Forest. Dixie Glade Campground. 918 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
  CDA12800  Cercocarpus betuloides G. F. Hrusa 1996-2-26 12635 Colusa Inner North Coast Ranges; On E side of ridge separating Blanchard Valley from Bear Valley, on Leesville Rd. Comment
  HSC95708  Cercocarpus montanus var. glaber G. Fred Hrusa 1998-6-19 14605 Colusa Above upper Little Stony Creek, Goat Mtn. Rd., 1.5 km W of campground 485 Comment
  UCD82735  Chaenactis glabriuscula var. heterocarpha Craig Thomsen; G. Harrington 2009-5-14 2916 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
  HSC49867  Chaenactis glabriuscula var. heterocarpha J. P. Smith, J. O. Sawyer 1978-4-29 9778 Colusa Lake/Colusa County Line; Walker Ridge Rd., 4.8 mi. N from the T-intersection to Indian Valley Reservoir Comment
  JEPS90921  Chamaesyce hooveri Dean W. Taylor 1993-8-31 14071 Colusa 200 m e of North Fork Logan Creek (Sacramento Valley, Sacramento National Wildlife Refuge); Sacramento Valley, Sacramento National Wildlife Refuge 24 Comment
  UC727669  Chamaesyce nutans Milo S. Baker 1946-9-4 11606 Colusa near locked gate Colusa Gun Club (Butte Sink); Butte Sink Comment
  JEPS110186  Chamaesyce serpillifolia subsp. hirtula Lowell Ahart 2006-8-9 13115 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  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
  SBBG28478  Chamaesyce serpillifolia subsp. serpillifolia Mrs. H. P. Bracelin 1931-10-1 565 Colusa Indian Crk, Lodoga Comment
  SBBG28500  Chamaesyce serpillifolia subsp. serpillifolia Mrs. H. P. Bracelin 1931-10-1 564 Colusa Indian Crk, ca. 7 mi N of Leesville 289 Comment
  SBBG67773  Chamaesyce serpillifolia subsp. serpillifolia Mrs. H. P. Bracelin 1931-10-1 565 Colusa Indian Crk, Lodoga 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
  UC1415295  Cheilanthes gracillima Dale E. Johnson and J. E. Eckenwalder 1974-6-2 127 Colusa ridge connecting E and W Peaks Snow Mt 2150 Comment
  JEPS80114  Chenopodium L. R. Heckard with J. Hickman 1980-7-1 5273 Colusa East Peak Snow Mt. (flat at summit, Colusa-Lake County boundary) 2148 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
  CHSC94517  Chenopodium album Lowell Ahart 2006-8-22 13221 Colusa South side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford. 349 Comment
  JEPS110404  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
  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
  UCD63033  Chenopodium californicum Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4685 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Along west side of Bear Creek, opposite Cowboy Canyon. 312 Comment
  JEPS75836  Chenopodium pumilio L. R. Heckard 1974-9-11 3951 Colusa edge of meadow just e Foutch Camp; Snow Mt. 1859 Comment
  UC1191335  Chenopodium strictum var. glaucophyllum Herbert L. Mason and Verne Grant 1946-8-7 12978 Colusa 8 mi n Colusa; Butte Sink Comment
  UCD168861  Chenopodium strictum var. glaucophyllum John Anderson 2015-1 s.n. Colusa about 0.5 mile north of Colusa Casino west of Highway 45. Comment
  UCD37231  Chloris gayana Beecher Crampton 1958-6-27 4980 Colusa Colusa County, 2.5 miles south of Grimes. Comment
  CHSC77630  Chlorogalum pomeridianum Heidi West; Caroline Warren 1998-5-26 Colusa Vicinity of Antelope Valley, Huffmaster Road, and Sites. 152 Comment
  UCD63132  Chlorogalum pomeridianum var. pomeridianum Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4933 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
  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
  RSA133247  Chrysothamnus nauseosus subsp. albicaulis Peter H. Raven, R. Snow 1959-9-11 14416 Colusa 0.5 mile south of Snow Mt. 1921 Comment
  UC1532347  Cicuta Vernon Oswald 1986-6-30 2176 Colusa North end of Lily Pond near Letts Lake. 1188 Comment
  CHSC93137  Cicuta douglasii D. Isle 2001-7-26 1388 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. In spring west of Letts Lake day use area. Comment
  UCD82543  Cirsium cymosum Ellen Dean; G. Harrington, C. Thomsen,R. Wilmarth,Chiao-Yi Cheng 2009-5-20 5698 a Colusa Walker Ridge. Til Jones Spring area along Walker Ridge Road. 833 Comment
  SEINET3840083  Cirsium cymosum T. C. Fuller 1958-5-27 3667 Colusa south of highway 20, 1 mile west of the junction with highway 16 Comment
  JEPS80872  Cirsium cymosum var. cymosum L. R. Heckard and J. C. Hickman 1980-7-1 5292 Colusa above Summit Springs (just above trail entrance to roadless area, Colusa-Lake County boundary); Snow Mt. 1645 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
  UC1299440  Cirsium douglasii var. douglasii Freed W. Hoffman 1947-6-19 1669 Colusa Cooks Springs North Coast Ranges Comment
  UC1543160  Cirsium occidentale var. venustum Charlotte Nash Smith 134 Colusa Williams, Lake Co. Road Colusa Comment
  CAS-BOT-BC286379  Cirsium occidentale var. venustum Roxana S. Ferris 1926-4-23 6459 Colusa On Stony Creek Comment
  UCD81256  Cirsium vulgare Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5421 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Just north of the road leading up from the confluence of Bear and Cache Creeks. 323 Comment
  CAS-BOT-BC228699  Cistanthe umbellata Mark A. Elvin; Mark S. Brunell; David Isle 2006-8-3 5029 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
  CAS-BOT-BC162597  Clarkia affinis C. G. Phillips; L. Cole; S. A. Haultain; K. B. Barrows 1984-4-29 35 Colusa Bear Valley Rd., 2 mi. N of Hwy 20 365 Comment
  CHSC86125  Clarkia affinis Jenny Marr; Caroline Warren 1998-5-4 Colusa Vicinity of Sites, Stone Corral Creek, and Antelope Valley. 106 Comment
  UCR39819  Clarkia affinis P. Williams, Mike Malamus, Brian Kearney 1984-4-28 72 Colusa Bear Valley Road 2 mi north of Hwy 20 366 Comment
  CAS-BOT-BC164151  Clarkia concinna Roxana S. Ferris 1926-4-23 6408 Colusa On grade beyond the Mountain House, Williams - Stonyford Road Comment
  CAS-BOT-BC164145  Clarkia concinna David D. Keck 1933-5-30 2401 Colusa 1 mile east of Lake County line, west of Wilbur Springs Comment
  CAS-BOT-BC164149  Clarkia concinna David D. Keck 1933-5-30 2401 Colusa 1 mile east of Lake County line, west of Wilbur Springs Comment
  CDA329  Clarkia concinna G. D. Barbe 1982-6-4 3635 Colusa 1.7 miles north of Pacific Ridge Forest Station, Mendocino National Forest. 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
  UCD66707  Clarkia concinna subsp. concinna Craig D. Thomsen 2001-5-24 2503 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.17 and 2.25. 342 Comment
  HSC66132  Clarkia gracilis Cathie Goldberg, Lynn Kunstman, Geoff Walsh, Lauren Philbrick 1980-4-19 52 Colusa Leesville Rd. from Leesville to Williams, 3.8 mi. E of Leesville Comment
  SBBG4972  Clarkia gracilis H. and M. Dearing 1939-5-12 3330 Colusa 20 mi N of Williams 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
  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
  UCD63108  Clarkia gracilis subsp. gracilis Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4939 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. 351 Comment
  JEPS122458  Clarkia gracilis subsp. sonomensis David Isle with F. Thomas Griggs 1979-5-23 2072 Colusa Mendocino National Forest. Goat Mtn. Road about 0.6+ mile W of junction w/ Lodoga-Stonyford Road Comment
  CHSC112017  Clarkia gracilis subsp. sonomensis David Isle; F. Thomas Griggs 1979-5-23 2072 Colusa Mendocino National Forest. Goat Mtn. Road about 0.6+ mile W of jct w/ Lodoga-Stonyford Road. 408 Comment
  CDA15461  Clarkia gracilis subsp. tracyi G. F. Hrusa, WTD 1998-6-19 14597 Colusa North Coast Ranges; Along Little Stony Creek, on Goat Mtn. Rd. ~ 1/2 km. W of intersection with Lodoga-Stonyford Rd. Comment
  HSC94165  Clarkia gracilis subsp. tracyi G. Fred Hrusa 1998-6-19 14597 Colusa Along Little Stony Creek, on Goat Mtn. Rd., ~0.5 km W of intersection with Lodoga-Stonyford Rd. 400 Comment
  UCD104567  Clarkia gracilis subsp. tracyi D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. 370 Comment
  UCD70216  Clarkia gracilis subsp. tracyi D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. 370 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
  SEINET8726150 Image available Clarkia purpurea Helen K. Sharsmith 1953-1 s.n. Colusa Above Mill Creek near Fouts Springs, Mendocino National Forest, altitude 2000 feet. 610 Comment
  UCD104881  Clarkia purpurea Karen Rose 1985-4-13 4 Colusa Salt Canyon, N side of Salt Creek, Highway 20, 11 miles WSW of Williams. 143 Comment
  UCD82130  Clarkia purpurea subsp. quadrivulnera Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5652 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
  UCD84560  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. Many old undeveloped roads here. 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
  CHSC79780  Clarkia rhomboidea G. F. Hrusa 1998-6-19 14604 Colusa the North Coast Ranges. Above upper Little Stony Creek. Goat Mtn. Rd. ~2 km. W of campground. UTM: 10S 05351 N, 43466 E. 490 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
  UCD100591  Claytonia exigua K. Esau 1934-5-6 s.n. Colusa West of Williams, Tahoe-Ukiah Highway. Comment
  JEPS86625  Claytonia exigua subsp. exigua L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-19 6705 Colusa 0.5 km w Summit Springs (sw flank of Snow Mountain, Colusa-Lake County line); Snow Mountain 1500 Comment
  CHSC62941  Claytonia exigua subsp. glauca Vernon H. Oswald; Lowell Ahart 1994-4-6 6055 Colusa Goat Mtn. Rd. 0.1 mi NE of Digger Pine Flat, S of Stonyford. Locally abundant on gravelly soil of a roadside bank. 463 Comment
  UC1745697  Claytonia gypsophiloides Annetta M. Carter, Sarah Dyal, Ethel Crum 1938-5-8 1380 Colusa Between Leesville & Stonyford. 6.6 mi. S of Lodoga. 3 mi. N of Leesville. Comment
  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
  CHSC72461  Claytonia parviflora subsp. parviflora L. P. Janeway; David Isle 1998-7-3 5708 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
  CHSC91018  Claytonia parviflora subsp. parviflora 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. Comment
  JEPS97385  Claytonia parviflora subsp. parviflora Vernon H. Oswald and L. Ahart 1994-4-6 6055 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
  UC638660  Claytonia parviflora subsp. parviflora Ethel Crum 1938-5-8 2023 Colusa 3 mi n Leesville; Inner Coast Range Comment
  UC638661  Claytonia parviflora subsp. parviflora Ethel Crum 1938-5-8 2022 Colusa 3 mi n Leesville; Inner North Coast Range 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
  UC1051503  Claytonia parviflora subsp. parviflora Helen K. Sharsmith 1953-6-19 4285 Colusa near Trough Springs (on Trough Springs Ridge); Inner North Coast Ranges, Mendocino National Forest 975 Comment
  CAS-BOT-BC92547  Clematis ligusticifolia Roxana Stinchfield 1916-7-5 388 Colusa Banks of Sycamore Slough. Stinchfield Ranch. Comment
  CHSC111245  Clematis ligusticifolia B. Castro 2008-7-10 1773 Colusa Sacramento Valley. Along S bank of Sacramento River, ca 5 mi N of town of Colusa, just N of Reservation Road; in undesignated section near Colusa Rancheria. 18 Comment
  RSA0037131  Clematis ligusticifolia B. Castro 2008-7-10 1773 Colusa Sacramento Valley. Along S bank of Sacramento River, ca. 5 mi N of town of Colusa, just N of Reservation Road; in undesignated Section near Colusa Rancheria. 18 Comment
  UC72761  Clematis ligusticifolia Miss M. Alice King 1905-1 Colusa along slough near College City; Sacramento Valley 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
  CHSC25053  Collinsia grandiflora G. N. Steger 1972-4-10 Colusa Along road cuts of Hwy. 20, s of Lucerne along the shore of Clear Lake. Comment
  CHSC33348  Collinsia heterophylla R. M. Winchell 1980-4-12 1 Colusa Ca. 0.3 mi. w of jct. of Hwys. 20 and 16, s side of Bear Creek, ca. 18 mi. sw of Williams. 321 Comment
  UC1613286  Collinsia heterophylla Charles M. Belshaw Apr 1937 2884 Colusa vicinity of Cook's Spring (Inner North Coast Range, Devil's Ridge); Inner North Coast Range, Devil's Ridge Comment
  UCD163219  Collinsia heterophylla Craig D. Thomsen 2001-4-12 2430 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
  UCD64412  Collinsia heterophylla Craig D. Thomsen 2000-4-12 2139 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
  CDA34091  Collinsia sparsiflora P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 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
  UC103381  Collinsia sparsiflora var. collina Katharine Brandegee Colusa Eppersons Comment
  UC638654  Collinsia sparsiflora var. collina Ethel Crum 1938-5-8 2029 Colusa 3 mi n Leesville; Inner North Coast Range Comment
  UCD57622  Collinsia sparsiflora var. collina Joseph A. E. Stewart; 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. Craig Canyon. South side of unimproved road. 335 Comment
  JEPS80164  Collinsia torreyi var. wrightii L. R. Heckard with J. Hickman 1980-7-2 5315 Colusa ca 10 mi w Stonyford (trail from Frog Pond to Milk Ranch, w of West Peak, Snow Mt.); Snow Mt. 1950 Comment
  CDA14918  Collomia diversifolia G. F. Hrusa 1993-5-2 10854 Colusa North Coast Ranges; Frenzel Creek Research Natural Area. Mendocino National Forest. 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
  UC1051697  Collomia diversifolia Helen K. Sharsmith 1953-6-18 4260 Colusa on Letts Valley road above Fouts Springs; Inner North Coast Ranges, Mendocino National Forest 731 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
  JEPS83553  Cordylanthus palmatus R. D. Stone 1987-8-26 850 Colusa w side of Ohm Rd ca 0.5 mi n jct. w/ Ware Rd. (corner of Colusa Nat'l Wildlife Refuge); Colusa Nat'l Wildlife Refuge, Arbuckle 7.5' quad. 13 Comment
  JEPS99065  Cordylanthus palmatus Dean W. Taylor 1988-8-8 10024 Colusa Colusa National Wildlife Refuge, far southeastern corner of Ohm Rd, 1 mi n of Ware Rd 22 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
  JEPS80717  Cordylanthus pilosus subsp. pilosus L. R. Heckard and J. C. Hickman 1981-7-28 5677 Colusa 3.7 km e Ladoga Bridge (w of Maxwell, along roadside) Comment
  UC71772  Cordylanthus pilosus subsp. pilosus H. P. Chandler 1905-10-14 Colusa Princeton 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
  UCD123114  Cordylanthus pringlei A. M. Shapiro 1994-8-16 s.n. Colusa Letts Valley Road, Canyon of Stony Creek. 1432 Comment
  UCD123117  Cordylanthus pringlei Craig Thomsen; Art Shapiro 2004-9-16 s.n. Colusa along Cool Springs Road. Comment
  CAS-BOT-BC209737  Cornus glabrata Roxana S. Ferris 1917-4-17 720 Colusa Oak grove along Sacramento River near Sycamore Slough Comment
  UC1776781  Cornus glabrata G. F. Hrusa 1989-5-7 6086 Colusa North Coast Ranges; Road to Cedar Mtn., along Little Stony Creek, approx. 2.5 miles above intersection with Stonyford-Lodoga Rd. Shaded area beneath Populus fremontii 450 Comment
  JEPS95819  Cornus sericea subsp. occidentalis Vernon H. Oswald and L. Ahart 1999-6-22 9777 Colusa Lily Pond near Upper Letts Lake west of Stonyford: T17N R8W Sect. 24, ca. 4080 ft, mixed coniferous forest. Twigs of a shrub ca. 3 m tall growing in wet soil along the edge of the meadow at the Lily Pond. 1243 Comment
  CDA36236  Cotula coronopifolia G. K. Helmkamp, E. A. Helmkamp 2009-3-11 14381 Colusa Sacramento Valley; Along CA Hwy. 20, 0.1 mile east of its junction with I-5, north end of Williams. Comment
  CHSC107950  Cotula coronopifolia B. Castro; T. Boullion 2011-4-20 1833 Colusa Sacramento Valley. Extreme W edge of Sacramento Valley; ca 5 air mi NW of Maxwell, 0.8 mi SE of Funks Reservoir and 700 ft northeast of Tehama-Colusa Canal. At north edge of large +- saline/alkaline wetland/marsh, at outer, wet edges of bald patches of bare pale soil. 49 Comment
  CHSC107965  Cotula coronopifolia B. Castro; L. Janeway 2011-4-27 1863 Colusa Sacramento Valley. Extreme W edge of Sacramento Valley; aproximately 1 mi southeast of Funks Reservoir and 800 ft northeast of Tehama-Colusa Canal. Approximate center of large +- alkaline marsh. 49 Comment
  CHSC98784  Cotula coronopifolia Richard R. Halse 2007-3-23 7109 Colusa Williams: by junction of 5th Street and B Street. 25 Comment
  CHSC62886  Crassula tillaea Vernon H. Oswald 1994-3-14 5993 Colusa Refuge located ca. 7 mi S of Willows, in the parking area in the NE corner of Tract 41. Sacramento National Wildlife Refuge. 25 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
  CHSC29713  Cressa truxillensis K. R. Stern 1980-6-30 6649 Colusa South central border area of Colusa National Wildlife Refuge. 45 Comment
  CHSC84955  Croton setiger Lowell Ahart 2003-10-23 10676 Colusa Along Squaw Creek, just south of East Park Reservoir, about 1/8 mile northwest of Sites Lodoga Road, about 1 mile north of Lodoga, about 21 miles west of Maxwell. 368 Comment
  UCD55457  Croton setiger Ellen Dean; Gordon Harrington 2006-10-6 3281 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
  CHSC113136  Crypsis alopecuroides Lowell Ahart 2013-10-1 19075 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-BC190084  Crypsis schoenoides James Jokerst 1985-4-24 2494 Colusa Near Lurline Creek. 41 Comment
  CDA16109  Crypsis schoenoides G. F. Hrusa, Dmitri Geltman (LE) 1999-8-18 15244 Colusa North Coast Ranges; Along Leesville Rd., +/- 1 mi S of Lodoga. 320 Comment
  CHSC107967  Crypsis schoenoides B. Castro; L. Janeway 2011-7-9 1896 Colusa Sacramento Valley. Extreme W edge of Sacramento Valley; ca 5 air mi NW of Maxwell, 0.8 mi SE of Funks Reservoir and 0.3 mi NE of Tehama-Colusa Canal. In small vernally moist pothole off S edge of a grain field, at NW end of vernally moist swale connected to a large +- saline/alkaline wetland/marsh about 0.2 mi to the S. 49 Comment
  CHSC113051  Crypsis schoenoides Lowell Ahart 2013-10-1 19076 Colusa Inner North Coast Range. Strand of East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  CHSC94448  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
  UC1100334  Crypsis schoenoides Herbert L. Mason 1945-7-11 12642 Colusa near Butte Creek (3 mi above Colusa); Butte Lodge Outing Club Comment
  UCD55460  Crypsis schoenoides Ellen Dean; Gordon Harrington 2006-10-6 3284 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 381 Comment
  CAS-BOT-BC190166  Crypsis vaginiflora H. S. Yates 1936-8-14 6131 Colusa 3 miles south of Colusa. 15 Comment
  RSA756393  Crypsis vaginiflora Barbara Ertter, Elizabeth Nesse, Laura Fujii, Dawn Espindola 1989-10-21 8873 Colusa SE end of East Park Reservoir N of Lodoga. 366 Comment
  RSA756835  Cryptantha affinis Barbara Ertter 1989-7-1 8615 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
  SD211562  Cryptantha affinis Barbara Ertter 1989-7-1 8615 Colusa Road to Goat Mount Lookout 1.7 miles South of Route M-10 (Bear Creek-Fouts Spring Road) at head of South Fork Stony Creek, circa 12 airmiles West-Southwest of Stonyford; at bend in road. 1463 Comment
  SEINET4206983  Cryptantha clevelandii var. dissita D. W. McNeal 1982-5-2 2632 Colusa On a rd. bank above Hwy. #20 at the Lake-Colus Co. line.; 0 Comment
  UCD82485  Cryptantha flaccida Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5672 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
  UCR44920  Cryptantha hendersonii 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
  SEINET7881830 Image available Cryptantha hendersonii Helen K. Sharsmith 1953-1 4278 Colusa One mile north of Trough Springs on Trough Springs Ridge; Mendocino National Forest 914 Comment
  CHSC106242  Cryptantha hispidula B. Castro; L. P. Janeway 2001-6-3 1258 B Colusa Inner North Coast Ranges. Spring at Grapevine flat, on top of Walker Ridge about 0.5 mi E of Baldy Mountain. East-facing slope/bench with large springy/meadowy area. At upper edges of meadow. 883 Comment
  CHSC27589  Cryptantha hispidula Robert Schlising 1978-5-13 3231 Colusa Just E of Lake County line, along Hwy 20 on serpentine soils. Comment
  HSC3611  Cryptantha hispidula Leo Koch 1940-4-29 936 Colusa Near Lake and Colusa county line along Hwy. 20, Williams Hwy. Comment
  UCD63018  Cryptantha hispidula Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4670 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Slopes to the west of Cowboy Camp on the west side of Bear Creek. 409 Comment
  UCD82513  Cryptantha hispidula Craig Thomsen; G. Harrington 2009-5-12 2871 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 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
  SEINET7883435 Image available Cryptantha hispidula Leo Koch 1940-1 936 a Colusa Serpentine hill near Lake and Colusa county line along Highway 20, Williams Highway Comment
  UCD22647  Cryptantha hispidula Laura F. Galloway 1988-5-1 3 Colusa Bear Valley Road, 0.5 mile north of Brim Road. 411 Comment
  UC726038  Cryptantha intermedia A. A. Heller 1940-5-6 15581 Colusa near Lake County line on State Highway 20 (near a bench mark) 232 Comment
  UC763053  Cryptantha intermedia R. F. Hoover 1941-5-2 4984 Colusa on Williams to Clear Lake highway (just e of Lake Co. line) Comment
  UCD57302  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. Thompson Canyon, near juncture with Craig Canyon. Above Thompson Creek. 366 Comment
  SBBG29133  Cryptantha intermedia L. Constance 1939-5-14 2489 Colusa 0.5 mi E of Mill Crk Ranger Station 548 Comment
  UC1177888  Cryptantha intermedia Peter M. Ray 1950-4-15 1713 Colusa road 3 mi e Stony Creek Bridge (s side of canyon of Big Stony Creek); Big Stony Creek 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
  JEPS120983  Cryptantha intermedia var. intermedia Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18630 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
  SDSU20614  Cryptantha intermedia var. intermedia Ronald B. Kelley 2008-4-13 1520 Colusa Bear Valley, on north side of Bear Valley Road, 5.75 miles south of Brim Road junction, on shallow, barren, eroding slopes. 387 Comment
  UC78682  Cryptantha microstachys K. Brandegee Apr 1889 Colusa Epperson's Comment
  UC1212061  Cryptantha muricata C. R. Bell 1950-4-26 770 Colusa w of Leesville (on road to Bartlett Springs, halfway up e side of county-line ridge) Comment
  UC78651  Cryptantha nemaclada Katharine Curran 1884-1 Colusa Comment
  UC78654  Cryptantha rostellata Katharine Curran May 1884 Colusa Leesville 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
  UCR212290  Cryptantha torreyana Ellen Dean, Davis Botanical Society 2008-5-31 5008 Colusa West of I-5 at Maxwell, east slope of Goat Mountain, along Goat Mountain Road, Cedar Grove Campground 1312 Comment
  UC1051501  Cryptantha torreyana Helen K. Sharsmith 1953-6-19 4282 Colusa near Trough Springs (on Trough Springs Ridge); Inner North Coast Ranges, Mendocino National Forest 975 Comment
  CHSC115439  Cuscuta K. R. Stern 1980-5-5 6632 Colusa South central border area of Colusa National Wildlife Refuge. 45 Comment
  CDA35676  Cuscuta approximata CDFA Staff 2011-11-5 PDR# 1552505 Colusa Maxwell. 0 Comment
  CHSC114931  Cuscuta approximata CDFA Staff 2011-11-5 Colusa Maxwell. Comment
  SBBG115554  Cuscuta californica var. californica B. Crampton 1961-7-20 5935 Colusa 4 mi SE of Grimes, along Knight's Landing Rd Comment
  UCD67007  Cuscuta californica var. californica Craig D. Thomsen 2008-5-23 2740 Colusa BLM Payne Ranch. Lands to the SW of Hwy 16/20 intersection. About 0.75 mile south of Hwy 20 (south of Destanella Flat), 2.5 miles west of Hwy 16. 520 Comment
  UCD67008  Cuscuta californica var. californica Craig D. Thomsen 2008-5-23 2749 Colusa BLM Payne Ranch. Lands to the SW of Hwy 16/20 intersection. About 0.75 mile south of Hwy 20 (south of Destanella Flat), 2.5 miles west of Hwy 16. 470 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
  SEINET3157202  Cycladenia humilis T. S. Brandegee 1890-6-23 sn Colusa Snow Mountain Comment
  JEPS15571  Cycladenia humilis var. humilis G. Thomas Robbins with L. R. Heckard 1956-7-25 3711 Colusa s. flank of Snow Mt. East (at lower edge of cirque between Snow Mt. West and Snow Mt. East, slope above Dark Hollow Creek (tributary of Middle Fork Stony Creek)) 1981 Comment
  UCD37228  Cynodon dactylon Beecher Crampton 1958-6-26 4975 Colusa Colusa County, 5.5 miles south of College City, just northeast of Hershey Railroad siding, Grieve Road (Country Road 88). Comment
  HSC62811  Cynoglossum grande Rick Lundquist 1979-4-14 19 Colusa Buck Flat, on Walker Ridge Rd. 884 Comment
  JEPS73505  Cynoglossum occidentale L. R. Heckard 1972-7-10 3122 Colusa near Trout Creek crossing of trail to Box Spring; Snow Mt. 1828 Comment
  UCD63773  Cynosurus echinatus Craig D. Thomsen 2008-5-23 2753 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
  CAS-BOT-BC114781  Cyperus acuminatus Roxana Judkins [later Mrs. Ferris q.v.] Stinchfield 1916-7-11 465 Colusa Davis tule, near Sycamore Slough. Comment
  UC837462  Cyperus acuminatus Roxana Stinchfield 1916-7-11 465 Colusa Davis Tule near Sycamore Slough Comment
  CAS-BOT-BC114783  Cyperus acuminatus Milo S. Baker 1946-9-4 11590 Colusa Gridley-Princeton Rd. Butte Sink. Comment
  JEPS64066  Cyperus difformis W. L. Jepson 1929-10-1 15343 Colusa Maxwell 25 Comment
  SEINET7581552 Image available Cyperus difformis Lowell Ahart 2006-8-9 13143 Colusa North side and just east of the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UC1100541  Cyperus difformis Malcolm A. Nobs and S. Galen Smith 1949-9-9 1877 Colusa 3 mi. w. Williams Comment
  UCD141014  Cyperus difformis P. B. Kennedy 1925-9-18 s.n. Colusa Cortena. Comment
  UC1100527  Cyperus eragrostis Herbert L. Mason and Verne Grant 1946-9-5 13117 Colusa 1.6 mi. w. Williams (rd. to Lake Co.) Comment
  CHSC112621  Cyperus erythrorhizos Lowell Ahart 2013-10-1 19078 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
  JEPS64102  Cyperus erythrorhizos W. L. Jepson 1929-10-1 15342 Colusa Maxwell 25 Comment
  UC1099935  Cyperus erythrorhizos Herbert L. Mason and Verne Grant 1946-9-5 13115 Colusa 1.6 mi. w. Williams (rd. to Lake Co.) Comment
  JEPS120794  Cypselea humifusa Lowell Ahart 2013-10-1 19073 Colusa Strand of East Park Reservoir, about 2.5 air miles SE of Stonyford, about 2.5 miles NW of Lodoga, about 10 air miles NW of Sites. Comment
  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
  CAS-BOT-BC445506  Damasonium californicum J. Clausen 1935-5-20 1017 Colusa Ca. 27 mi. W. of Williams after having passed the Wilbur Springs road. Along Bear Creek Comment
  RSA91938  Damasonium californicum Beecher Crampton 1953-4-29 1148 Colusa 7 miles E of Maxwell. Comment
  UCD38842  Damasonium californicum Beecher Crampton 1958-6-27 4984 Colusa Colusa County; five miles south of Colusa. Comment
  JEPS80385  Danthonia unispicata L. R. Heckard and J. Hickman 1981-6-22 5618 Colusa Dark Hollow Creek Snow Mt. (meadow) 1889 Comment
  CDA16113  Datisca glomerata G. F. Hrusa, Dmitri Geltman (LE) 1999-8-18 15240 Colusa North Coast Ranges; Leesville Rd. On E side of main ridge from Bear Valley. 213 Comment
  CHSC75705  Datisca glomerata Vernon H. Oswald; Lowell Ahart 1999-6-22 9787 Colusa 2.2 mi west of Stonyford-Lodoga Road on County Road 42 paralleling Little Stony Creek. 426 Comment
  UCD58171  Datisca glomerata Gordon Harrington 2007-5-31 61 Colusa BLM Payne Ranch. Lands to the SW of the intersection of Hwy 16 and Hwy 20. Along Thompson Creek, approximately 1 mile downstream from Road Kill Cafe. 336 Comment
  UCD81715  Datisca glomerata Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5721 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
  UCR257972  Datisca glomerata Gordon Harrington 2007-5-31 061 Colusa BLM Payne Ranceh. Lands to the southwest of the intersection of Hwy 16 and Hwy 20. Along Thompson Creek, c. 1 mi downstream from Road Kill Cafe 337 Comment
  CHSC94514  Datura wrightii Lowell Ahart 2006-8-22 13205 Colusa At the intersection of Sites Lodoga Road and a dirt road to Elk Creek, about 1 1/2 miles (air) east of East Park Reservoir, about 4 1/2 miles (air) northeast of Lodoga. 545 Comment
  JEPS110408  Datura wrightii Lowell Ahart 2006-8-22 13205 Colusa At the intersection of Sites Lodoga Road and a dirt road to Elk Creek, about 1 1/2 miles (air) east of East Park Reservoir, about 4 1/2 miles (air) northeast of Lodoga 545 Comment
  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
  JEPS121115  Daucus pusillus Lowell Ahart 2013-5-1 18675 Colusa On the N side of the wash, N side of 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
  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
  UC88929  Deinandra kelloggii K. Brandegee 1887-5-1 Colusa Comment
  UCD148567  Delphinium G. Ledyard Stebbins 1985-5-19 C 526 Colusa Colusa - Lake County border: Southeast of Goat Mountain peak. Pacific Point along Goat Rock Ridge and above Green Flat Camp Ground. (Exact location unknown; coordinates estimated by label maker.) 1524 Comment
  JEPS81406  Delphinium antoninum L. R. Heckard and J. C. Hickman 1982-7-9 6013 Colusa about 100 m w lookout (Colusa-Lake Co. boundary); Goat Mt 1859 Comment
  UCD38812  Delphinium hesperium Beecher Crampton 1958-5-19 4798 Colusa 5.8 miles south of Lodoga. Comment
  UCD57667  Delphinium hesperium Erica A. Smith; 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. Along unimproved road, just west of where road crosses Craig Creek. 313 Comment
  UCD18513  Delphinium hesperium Roman Gaukin 1958-5-4 s.n. Colusa Bear Valley. Comment
  CAS-BOT-BC238187  Delphinium hesperium subsp. pallescens Roman Gaukin 1958-5-4 s.n. Colusa Bear Valley Comment
  CHSC61697  Delphinium hesperium subsp. pallescens Marjorie McBride 1986-4-5 11 Colusa Hwy 20, 3 mi e of jct with Hwy 16. Top of slope, s side of road. 243 Comment
  UC1777719  Delphinium hesperium subsp. pallescens Roman Gaukin 1958-5-4 Colusa Bear Valley Comment
  UCD163308  Delphinium hesperium subsp. pallescens Craig D. Thomsen 1997-4-20 1911 Colusa Bear Valley. About 5 miles north of Hwy 20. Comment
  JEPS6254  Delphinium hesperium subsp. pallescens W. L. Jepson 1932-5-7 16261 Colusa Venado (2 mi. above, in a little valley), Southwestern Colusa County 304 Comment
  RSA232955  Delphinium nudicaule D. A. Young 1969-5-4 321 Colusa 10 miles W of Wilbur Springs, along Hwy 16. 610 Comment
  HSC31627  Delphinium patens Glenn McGourty 1974-4-20 12 Colusa Roadcut of Hwy. 16, 17 mi. E of Esparto Comment
  CAS-BOT-BC17043  Delphinium recurvatum A. A. Heller 1940-5-6 15574 Colusa State Highway #20, about 3 miles east of the junction with Highway #16. Comment
  CAS-BOT-BC17044  Delphinium recurvatum Mrs. H. C. Cantelow 1936-4-11 1208 Colusa Bear Creek Canyon. Comment
  SEINET5338169  Delphinium variegatum M. J. Williams 1967-5-7 s.n. Colusa Bear Valley. 396 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
  CDA11414  Delphinium variegatum subsp. variegatum G. F. Hrusa, K. van Katwyk 1995-4-22 12135 Colusa Inner North Coast Ranges; Large colony on hillslope at E base of ridge immed. E of Bear Valley, along Leesville Road. Flowers dark purple. Common, perennial, root not detaching. 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
  SEINET3927152  Deschampsia cespitosa Fred W. Hoffman 1944-7-13 1949 Colusa Between Indian and Bear valleys, western.; 0 Comment
  JEPS82284  Deschampsia cespitosa subsp. cespitosa Roger Raiche 1982-3-20 20245 Colusa Walker Ridge Comment
  CAS-BOT-BC192668  Deschampsia danthonioides Doris K. Kildale 1928-5-8 5019 Colusa 3 miles south of Arbuckle Comment
  CAS-BOT-BC192670  Deschampsia danthonioides A. A. Heller 1902-5-1 5435 Colusa Near College City 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
  CAS-BOT-BC402210  Dicentra chrysantha A. A. Heller 1940-6-5 15713 a Colusa Near the foot of the grade east of Lodogo, on the Lodogo-Sites road Comment
  UC1051506  Dicentra chrysantha Helen K. Sharsmith 1953-6-19 4277 Colusa 1 mi n Trough Springs (on Trough Springs Ridge); Inner North Coast Ranges, Mendocino National Forest 914 Comment
  CHSC110819  Dicentra chrysantha David Isle; Rhonda Isle 2013-5-19 2040 Colusa Mendocino National Forest - North Coast Ranges Little Stony Creek Watershed. 0.1 mi W of Maxwell Grade Summit; Burned NW asp. S of Sites Lodoga Road. 548 Comment
  CAS-BOT-BC277739  Dichelostemma Mona Bourell 1997-3-29 5810 Colusa Mendocino National Forest along Road near Brittan Ranch, 0.1 mi. N of North Fork Campground Comment
  UC1093627  Dichelostemma capitatum Francia Chisaki and Gene B. Newcomb 1958-4-1 1098 Colusa 0.7 mi nw Highway 20 junction with road to Lodoga (on road to Lodoga) Comment
  UC71643  Dichelostemma capitatum Miss Alice King 1905-1 Colusa College City Comment
  CHSC27508  Dichelostemma capitatum subsp. capitatum Michael F. Henetz 1978-4-15 4 Colusa Ca. 100 m s of Hwy. 20, ca. 0.5 km w of junction of Hwy 20 and Hwy. 16, ca. 29 km s of Williams. 322 Comment
  HSC31395  Dichelostemma capitatum subsp. capitatum Maralyn O'Meara, Gary S. Lester 1974-5-4 350 Colusa Walker Ridge Rd., 0.7 mi. from junction with Little Indian Valley Rd. 854 Comment
  HSC31688  Dichelostemma capitatum subsp. capitatum Bonnie Prange 1974-5-4 Colusa Near Clyde Mine 854 Comment
  HSC31718  Dichelostemma capitatum subsp. capitatum Teresa Prendusi 1974-5-4 50 Colusa Beyond Clyde Mine 1/8 mi. 854 Comment
  CAS-BOT-BC502550  Dichelostemma congestum Roxana S. Ferris 1926-4-21 6309 Colusa Sycamore Slough near Sycamore Comment
  UCD84561  Dichelostemma volubile Ellen Dean; C. Thomsen, G. Harrington, Davis Botanical Society 2010-6-5 6086 Colusa Walker Ridge. Along Walker Ridge Road, N of turnoff to Indian Valley Reservoir but S of Til Jones Springs. Many old undeveloped roads here. 817 Comment
  CAS-BOT-BC503142  Dichelostemma volubile Roxana S. Ferris 1926-4-23 6413 Colusa On grade beyond the Mountain House on the Williams-Stonford Road Comment
  RSA725022  Digitaria sanguinalis L. Ahart 2006-8-22 13226 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
  CHSC94637  Diplacus layneae Lowell Ahart 2006-6-11 12664 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
  RSA0018384  Dipsacus fullonum Joan Stewart 1998-6-18 755 Colusa Bear Valley Comment
  CHSC29761  Distichlis spicata K. R. Stern 1980-6-30 6647 Colusa Vernal pool, south central border area of Colusa National Wildlife Refuge. 45 Comment
  UCD18846  Distichlis spicata Vernal Pool Team 2001; Carol Witham and Jennifer Buck 2001-4-30 154 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
  UCD61480  Distichlis spicata Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3887 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 NW of parking lot. 339 Comment
  UCD64170  Distichlis spicata Beecher Crampton 1958-6-27 4979 Colusa 2.5 miles south of Grimes. Comment
  RSA590196  Dodecatheon hendersonii Michael A. Vincent, Robert M. Rhode 1996-3-30 7298 Colusa Along Brim Rd., 1.9 mi. W jct. Bear Valley Rd. 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
  JEPS5035  Downingia insignis W. L. Jepson 1934-5-3 16597 Colusa College City Comment
  RSA60889  Downingia insignis Frank W. Gould 1938-4-23 295 Colusa Roadside between Arbuckle and Williams. Comment
  CHSC27583  Downingia pulchella Timothy Spira; Robert Schlising 1978-5-13 3248 Colusa Bear Valley, about 5 mi S of Leesville, on Bear Valley (=Wilbur Springs) Road. Comment
  UC2048629  Downingia pulchella Lisa Schultheis with Ewald Weber 1995-6-3 203 -95 Colusa Bear Valley. Comment
  LA204320  Draba cuneifolia A. L. Haines; William Stewart 1935-2-10 sn Colusa 2 mi. N of Miller's Landing Comment
  HSC45678  Dudleya cymosa Stephen Plant 1978-4-22 203 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  JEPS120706  Dysphania pumilio Lowell Ahart 2013-10-1 19086 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-BC197058  Echinochloa crus-galli Milo S. Baker 1944-7-18 10871 Colusa A few mi. W. of Williams along Highway to Lake Co. Comment
  JEPS110362  Echinochloa crus-galli Lowell Ahart 2006-8-22 13233 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  SACT001042  Echinochloa crus-galli Malcolm Nobs, S. Smith 1949-9-9 Colusa Rice fields, 3 miles west of Williams. Comment
  UCD32927  Echinochloa crus-galli Beecher Crampton 1965-7-8 7447 Colusa Colusa County, 2 miles south of Sycamore. 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
  UCD61167  Echinochloa oryzicola P. B. Kennedy 1925-9-18 Colusa Rice Station, Cortena. Comment
  UCD61175  Echinochloa oryzoides P. B. Kennedy 1928-9-15 Colusa Cortena. Comment
  CAS-BOT-BC445568  Echinodorus berteroi Roxana Stinchfield 1916-7-11 436 Colusa Davis Tule near Sycamore Slough Comment
  RSA518796  Echinodorus berteroi Barbara Ertter, E. Neese, Laura Fujii, Dawn Espindola 1989-10-21 8879 Colusa NW side of East Park Reservoir near end of East Park Road form Stonyford. 366 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
  UC1100140  Echinodorus berteroi Herbert L. Mason and Verne Grant 1946-8-6 12971 Colusa pond 2.7 mi. n. of Colusa (between Sacramento R. and Butte Creek) Comment
  CDA19006  Echinodorus berteroi R. Breckenridge 2000-9-25 PDR 958948 Colusa East Park Reservoir, vicinity of Stonyford. 0 Comment
  UCD137952  Echinodorus berteroi P. B. Kennedy 1925-9-1 s.n. Colusa Cortina. Comment
  UC1101544  Elatine ambigua Malcolm A. Nobs and S. Galen Smith 1949-9-10 1892 Colusa 17 mi n Knights Landing (rice fields) Comment
  CAS-BOT-BC113366  Eleocharis engelmannii Malcom A. Nobs; Stanley Galen [S. Galen] Smith 1949-9-9 1878 Colusa Rice fields 3 miles west of Williams. Comment
  UC1100601  Eleocharis engelmannii Malcolm A. Nobs, S. Galen Smith 1949-7-18 1006 Colusa 2.5 mi W of Williams Comment
  UCD49591  Eleocharis engelmannii S. Galen Smith; Malcolm A. Nobs 1949-9-9 1878 Colusa Rice fields 3 miles W of Williams. Comment
  CHSC107160  Eleocharis macrostachya L. P. Janeway; B. Castro 2011-5-19 10288 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. Mass of this along south edge of the marsh. Occasional patches of this scattered through much of the marsh. 49 Comment
  CHSC79049  Eleocharis macrostachya J. Marr; C. Warren, H. West 1998-7-1 Colusa West of Maxwell, vicinity of Logan Ridge and Funks Creek, in vernal pool in narrow valley bottom west of ridge. 106 Comment
  UC1100581  Eleocharis macrostachya Malcolm A. Nobs, S. Galen Smith 1949-7-18 1006 a Colusa 2 mi W of Williams Comment
  UC1100742  Eleocharis macrostachya Herbert L. Mason, Verne Grant 1946-8-6 12965 B Colusa 4 mi S of Colusa (pond on Colusa - Marysville Highway, W side of Sacamento River) Comment
  UCD49729  Eleocharis montevidensis D. Sanchez-Mata 1998-7-10 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain between Lodoga and Red Rock Cabin. 420 Comment
  JEPS102227  Eleocharis parishii L. P. Janeway and B. Castro 2001-6-3 7102 Colusa Inner North Coast Ranges. At Buck Flat: east side of Walker Ridge at head of Gaither Canyon; about 1.3 km south-southeast of Baldy Mountain. 872 Comment
  UCD163346  Eleocharis parishii Craig D. Thomsen 2000-5-11 2352 Colusa Walker Ridge. Buck Flat. 129 Comment
  JEPS80832  Eleocharis suksdorfiana L. R. Heckard and J. C. Hickman 1981-8-1 5804 Colusa between new Fouth Camp and High Rock (s. side of Snow Mt.); Snow Mt. 1905 Comment
  UC2014254  Elymus elymoides Ellen Dean, C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6067 Colusa Colusa County. On Lake County border. Walker Ridge. Along Walker Ridge Road. Buck Flat. Comment
  UCD66475  Elymus elymoides Craig D. Thomsen 2001-5-24 2492 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
  UCD61690  Elymus elymoides subsp. californicus D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley. Destanella Flat-Walker Ridge. 450 Comment
  UC1055953  Elymus elymoides subsp. elymoides Helen K. Sharsmith 1953-6-19 4267 Colusa Red Bridge Camp Inner North Coast Ranges, Mendocino National Forest (near confluence of North and Middle Forks of Stoney Creek) 548 Comment
  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
  UC821522  Elymus multisetus A. A. Heller 1916-6-6 12357 Colusa grade about 3 mi w Leesville 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
  UC1795019  Elytrigia elongata R. K. Brummitt 1997-6-11 19696 Colusa 1 km W of Colusa on Route 20 100 Comment
  CHSC110861  Emmenanthe penduliflora David Isle; Rhonda Isle 2013-5-19 2041 Colusa 0.1 mi W of Maxwell Grade Summit; burned NW asp. S of Sites Lodoga Road. 7/12 Sites Fire Area. 10S 0546355E 4355688N. 548 Comment
  UC1051707  Emmenanthe penduliflora Helen K. Sharsmith 1953-7-1 4406 Colusa Trough Springs Ridge; Inner North Coast Ranges, Mendocino National Forest 609 Comment
  UCD82384  Emmenanthe penduliflora Craig Thomsen; G. Harrington 2009-5-12 2825 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
  CHSC90779  Emmenanthe penduliflora var. penduliflora D. Isle 2002-4-18 183 Colusa Mendocino National Forest--North Coast Ranges. Upper Lake Watershed. S. of Bathhouse Trail Rd. 17N51, N. of Fouts Springs. 548 Comment
  UCD105385  Epilobium brachycarpum P. B. Kennedy 30-31 May 1922 s.n. Colusa Near Colusa. 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
  RSA724966  Epilobium ciliatum subsp. glandulosum L. Ahart 2006-8-9 13139 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
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Aug 9 2017
  CHSC113048  Epilobium densiflorum Lowell Ahart 2013-10-1 19102 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
  JEPS120710  Epilobium densiflorum Lowell Ahart 2013-10-1 19102 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
  UCD164145  Epilobium densiflorum Craig Thomsen 1997-6-21 1932 Colusa Bear Valley. About 7 miles north of Hwy 20, southern Bear Valley. 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
  CHSC70986  Epilobium minutum Vernon Oswald; Lowell Ahart 1998-5-7 9005 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
  JEPS120978  Epilobium minutum Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18649 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
  UC638657  Epilobium minutum Ethel Crum 1938-5-8 2026 Colusa 3 mi n Leesville; Inner North Coast Range Comment
  UCD106510  Epilobium minutum Linda A. Bell 1975-4-27 79 Colusa Barlett Springs Road, 1.5 miles E of Bear Valley Road. 609 Comment
  CHSC32221  Epilobium nivium James Jokerst 1980-8-6 1049 Colusa North Coast Ranges. Near Snow Mountain. 484 Comment
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Dec 23 2008
  JEPS74982  Epilobium nivium L. R. Heckard 1974-9-11 3955 Colusa w parking area near Summit Springs (sw slope of mt.); Snow Mt. 1706 Comment
  CHSC92878  Epilobium torreyi D. Isle 2005-7-10 1171 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. On W side of property; in field on Isle property just W of Salt Creek, Stonyford. In barnyard at Isle property. Comment
  JEPS75757  Epilobium torreyi L. R. Heckard and R. Bacigalupi 1976-9-6 4440 Colusa just e Fouts Camp (e side of meadow); Snow Mt. 1859 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-BC58046  Equisetum Roxana Stinchfield 1916-7-11 430 Colusa Sycamore Slough Road. 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
  HSC97370  Eragrostis cilianensis J. P. Smith, J. O. Sawyer 2007-9-2 12418 Colusa River Rd. N of Colusa 20 Comment
  CAS-BOT-BC213552  Eragrostis hypnoides Roxana Stinchfield 1916-7-8 383 Colusa In bed of Sycamore Slough. 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
  JEPS108911  Eremocarpus setiger Lowell Ahart 2006-8-9 13103 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford 422 Comment
  UCR261664  Eriastrum abramsii Ann Howald 2003-5-8 2333 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3.7 miles north of Lodoga, near Chisolm Cove Group Campground 380 Comment
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Dec 15 2016
  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
  JEPS80277  Ericameria greenei L. R. Heckard and J. Hickman 1980-9-16 5463 Colusa West Peak Snow Mt. (n slope) 2042 Comment
  RSA589927  Ericameria linearifolia Michael A. Vincent, Robert Rhode 1996-3-30 7310 Colusa Along Walker Ridge Road, 11.5 miles S of junction with Brim Road Comment
  UCD84637  Erigeron greenei G. Harrington 2009-7-21 86 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
  JEPS73515  Erigeron petrophilus var. petrophilus L. R. Heckard 1972-7-10 3133 Colusa overlooking and 3 mi nw Fouts Springs (se corner of Snow Mt.); Snow Mt. 1828 Comment
  JEPS75738  Erigeron petrophilus var. petrophilus L. R. Heckard 1974-9-10 3899 Colusa e slope East Peak; Snow Mt., East Peak 2103 Comment
  CAS-BOT-BC216050  Eriodictyon californicum Roxana Stinchfield 1916-6-17 278 Colusa Cemetery, College City Comment
  RSA23083  Eriodictyon californicum Lincoln Constance 1939-5-14 2488 Colusa Above Middle Fork of Stony creek 2.5 miles E of Bonnie View, Inner N Coast Ranges 518 Comment
  UC624291  Eriodictyon californicum L. Constance 1939-5-14 2488 Colusa 2.5 mi e of Bonnie View (above Middle Fork of Stony Creek, Inner North Coast Ranges); Inner North Coast Ranges 518 Comment
  UC71629  Eriodictyon californicum Miss Alice King 1905-1 Colusa College City Comment
  UCD58169  Eriodictyon californicum Gordon Harrington 2007-5-15 59 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
  RSA0056304  Eriodictyon californicum James R. Shevock 1971-4-8 938 Colusa Sites Lodge Rd., near Grapevine Pass. 426 Comment
  CAS-BOT-BC242579  Eriogonum dasyanthemum James L. Reveal 1988-6-2 6986 Colusa Walker Ridge Road along the Lake County line, 4.1 miles south of the Bartlett Springs Road and 3.2 miles south of the northern turnoff to Barrel Springs Campground, about 12.7 miles north of California Highway 20 990 Comment
  CHSC112641  Eriogonum dasyanthemum Lowell Ahart 2013-10-1 19066 Colusa Inner North Coast Range. Near a small drainage, north of the wash and State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  POM279914  Eriogonum dasyanthemum Lyman Benson 1933-6-26 4489 Colusa Abbott mine. 549 Comment
  RSA216788  Eriogonum dasyanthemum Robert F. Hoover 1968-5-27 11100 Colusa Bear Creek canyon N. of Highway 20 (near Wilbur Springs) 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
  UCR212378  Eriogonum dasyanthemum Ellen Dean, Craig D. Thomsen, N. Voegtly, J. Alderson, Gordon Harrington 2008-3-30 4677 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Slopes to the NW of Eula Canyon and west of Cowboy Camp on the west side of Bear Creek 513 Comment
  CAS-BOT-BC242581  Eriogonum dasyanthemum James L. Reveal 1975-7-27 3902 Colusa Along the Leesville Road west of Williams, on a steep road grade about 3.2 miles southeast of Leesville, and about 1 mile below the summit of the grade Comment
  UCSB1430  Eriogonum gracile Keator, Glenn 1958-6-16 Colusa just east of Colusa-Lake County line; on road from Lower Lake to Sacramento Valley Comment
  RSA96804  Eriogonum luteolum Percy C. Everett, E. K. Balls 1954-10-17 20336 Colusa West slope Goat Mt., 0.9 mile SW from Linger Longer campsite; road from Stonyford to Upper Lake 1829 Comment
  JEPS75713  Eriogonum luteolum var. luteolum L. R. Heckard 1974-9-9 3838 Colusa Trail up from Summit Springs; Colusa-Lake County Line, Snow Mt. 1645 Comment
  UCD55453  Eriogonum nudum Ellen Dean; Gordon Harrington 2006-10-6 3277 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 374 Comment
  CDA15552  Eriogonum nudum var. nudum G. F. Hrusa 1998-10-28 14903 Colusa North Coast Ranges; Cedar Camp Rd. as it enters Little Stony Ck. Cyn., approx. 1 mi. from Lodoga/Stonyford Rd. Comment
  JEPS80805  Eriogonum strictum var. greenei L. R. Heckard and J. C. Hickman 1981-7-30 5776 Colusa about 2.5 km on ridge running e from West Peak; Snow Mt. 2011 Comment
  CHSC117782  Eriogonum tripodum David Isle; Terril Wolt 2016-6-16 2164 Colusa North Coast Range: 3/4 mi NE of Fouts Springs and 1/4 mi WNW of Davis Flat on greenish, rocky serpentine ridge. 549 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
  CHSC101098  Eriogonum umbellatum var. bahiiforme D. Isle 2005-8-1 1155 Colusa In the saddle and ridge top 1/3 mile south of Goat Mountain Lookout, 1804 Comment
  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
  CHSC91046  Eriophyllum lanatum D. Isle 2003-6-12 371 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. GPS 10S 524888E 4345370N, ridgetop. 1816 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-BC308098  Eriophyllum lanatum var. achilleoides A. A. Heller 1916-6-6 12353 Colusa Coast Range on the grade about 3 miles west of Leesville Comment
  CAS-BOT-BC308099  Eriophyllum lanatum var. achilleoides Roxana S. Ferris 1926-4-23 6453 Colusa Stonyford Comment
  RSA273361  Eriophyllum lanatum var. achilleoides J. P. Smith, Tom Nelson 1976-4-14 8578 Colusa Mendocino National Forest, confluence of Stony Creek and North Fork of Stony Creek 427 Comment
  UC614545  Eriophyllum lanatum var. achilleoides L. Constance 1938-4-22 2150 Colusa 11 mi ne of: along Lower Lake-Williams road, above Salt Creek Lake-Colusa line; Inner North Coast Ranges 152 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
  RSA302654  Eriophyllum lanatum var. achilleoides Jim Shevock 1971-4-8 939 Colusa Sites-Lodoga Road 427 Comment
  CAS-BOT-BC301384  Eriophyllum lanatum var. grandiflorum Roxana S. Ferris 1917-4-18 587 Colusa 5 mi west of Arbuckle, Arbuckle - Rumsey Road Comment
  UCD38807  Eriophyllum lanatum var. grandiflorum Beecher Crampton 1958-5-19 4813 Colusa Little Stony Creek canyon, west of Ladoga. Comment
  UCD70241  Eriophyllum lanatum var. grandiflorum D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley. Destanella Flat-Walker Ridge. 450 Comment
  UC109465  Erodium brachycarpum Brandegee Apr 1889 Colusa Colusa Junction Comment
  UC35202  Erodium cicutarium J. Burtt Davy May 1898 4281 Colusa near Willows Comment
  UCD82123  Erodium cicutarium Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5651 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
  UCR212363  Erodium cicutarium Craig D. Thomsen 2000-3-31 2083 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
  UCR238747  Erodium moschatum George K. Helmkamp, E. A. Helmkamp 2012-2-9 18536 Colusa Sacramento Valley, River Road, 7.1 miles north of Colusa; east side of Sacramento River 18 Comment
  UC1299245  Eryngium aristulatum var. aristulatum Freed W. Hoffman 1947-6-19 1662 Colusa Cooks Springs western Colusa Co., North Coast Ranges, Cooks Springs Comment
  UC21016  Eryngium aristulatum var. aristulatum J. Burtt Davy 1898-5-1 4300 Colusa near Willows Comment
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Sep 15 2014
  UC727670  Eryngium castrense Milo S. Baker 1946-9-4 11611 Colusa near locked gate of Colusa Gun Club Butte Sink Comment
  CDA38319  Eryngium castrense Kingwell 1930-5-2 s.n. Colusa [no additional data] 0 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-BC40755  Erysimum capitatum G. B. Rossbach; R. P. Rossbach 1938-5-31 851 Colusa About 18 miles west of Williams. Comment
  HSC71302  Erysimum capitatum var. capitatum Thomas W. Nelson, Jane P. Nelson 1979-4-12 4624 Colusa Along Stony Creek below Digger Pine Campground Comment
  UCD81855  Erysimum capitatum var. capitatum Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5739 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
  RSA590193  Erysimum capitatum var. capitatum Michael A. Vincent, Robert M. Rhode 1996-3-30 7287 Colusa Along Bear Valley Rd. above Bear Creek, 0.6 mi. N jct. Wilbur Springs Rd. Comment
  CHSC80446  Erythranthe latidens Caroline Warren; Jenny Marr 1998-5-4 Colusa Vicinity of Sites and Stone Corral Creek. 91 Comment
  CAS-BOT-BC376186  Erythranthe moschata Andrew Townesmith; Karen M. Meyer 2007-8-7 912 Colusa Mendocino National Forest, Grindstone Ranger District. Big Spring Picnic area on Lett's Lake, off Forest Service road 17N02, 3.2 miles SW from intersection with Forest Service route M10 1371 Comment
  HSC72147  Eschscholzia caespitosa J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9560 Colusa Bear Valley Rd., 2.1 mi. from its junction with Hwy. 20 366 Comment
  JEPS51725  Eschscholzia californica Alice King June 1906 Colusa College City Comment
  UC630427  Eschscholzia californica Annetta Carter 1938-5-8 1392 Colusa 5.5 mi s Leesville (on Wilbur Springs rd); Inner North Coast Range, Bear Valley 426 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-BC402979  Eschscholzia californica Roxana S. Ferris 1926-4-21 6271 Colusa 2 miles west of Sycamore Comment
  SD8240  Eschscholzia californica Brandegee Apr 1889 Colusa Comment
  CAS-BOT-BC91581  Eschscholzia rhombipetala K. Curran s.n. Colusa Stites. 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
  UCD163848  Euphorbia crenulata Craig D. Thomsen 2000-5-30 2275 b Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCD66704  Euphorbia crenulata Craig D. Thomsen 2001-4-12 2454 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
  CAS-BOT-BC366912  Euphorbia spathulata Richard R. Halse 2013-3-27 8760 Colusa Along State Hwy. 20 just east of the Colusa/Lake County Line, ca. 14.6 miles E of the junction of State Hwys. 20 and 53 558 Comment
  CHSC112255  Euphorbia spathulata Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18645 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
  CHSC70979  Euphorbia spathulata Vernon Oswald; Lowell Ahart 1998-5-7 9002 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
  UC73440  Euphorbia spathulata Miss M. Alice King 1905-1 Colusa near College City; Sacramento Vally Comment
  UCD56931  Euphorbia spathulata Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3534 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Thompson Canyon. 353 Comment
  UCD57049  Euphorbia spathulata Gordon Harrington; Diana Hickson 2007-4-7 14 Colusa BLM Payne Ranch, SW of intersection Hwy 16 and Hwy 20, 3/4 mile west of Roadkill Cafe. 499 Comment
  UCD82371  Euphorbia spathulata Robin McMaster 1973-4-15 344 Colusa 0.5 mi towards Bartlett Springs from Bear Valley Road. Comment
  UCD57295  Extriplex joaquinana Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3666 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
  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
  UCD82573  Extriplex joaquinana Craig Thomsen 2008-6-12 2764 Colusa Walker Ridge, near Elgin Mine on Lucientes property. 655 Comment
  UCD82632  Festuca arundinacea Jack Alderson 2009-8-6 28 Colusa BLM Bear Creek (formerly Payne) Ranch. Lands to the SW of junction of Hwys 16 and 20. Northeastern corner of ranch, just S of Hwy 20. 313 Comment
  JEPS75748  Festuca californica L. R. Heckard and R. Bacigalupi 1976-9-6 4423 Colusa above Summit Springs (along trail to Fouts Camp, Colusa-Lake County line); Snow Mt. 1645 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
  CHSC112210  Festuca microstachys var. pauciflora Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18636 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
  JEPS120970  Festuca microstachys var. pauciflora Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18636 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
  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
  CAS-BOT-BC77676  Ficus carica J. H. Thomas 1960-8-30 8867 Colusa Edge of College City Comment
  SEINET7417537 Image available Frangula californica A. A. Heller 1916-1 12359 Colusa Coast Range; ca. 3 mi W of Leesville Comment
  CAS-BOT-BC63012  Frangula californica subsp. crassifolia A. A. Heller 1916-6-6 12360 Colusa Coast Range on the grade about 3 mi. w. of Leesville. Comment
  LA207661  Frangula californica subsp. crassifolia A. A. Heller; 1916-6-6 12359 Colusa on grade ca 3 mi W of Leesville Comment
  CAS-BOT-BC62917  Frangula californica subsp. tomentella C. Hart Merriam 1923-5-9 s.n. Colusa Stony Ford. Comment
  CAS-BOT-BC62920  Frangula californica subsp. tomentella C. Hart Merriam 1907-7-23 s.n. Colusa Cook Spgs. Comment
  UCD112795  Frangula californica subsp. tomentella D. Sanchez-Mata 1998-7-9 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain Road between Lodoga and Red Rock Cabin. At Stoney Creek. 450 Comment
  UCD83758  Frangula californica subsp. tomentella Ellen Dean; G. Harrington, K. Mawdsley, J. Shepard 2010-5-1 5954 Colusa Colusa County. Walker Ridge. Along Walker Ridge Road, Buck Flat. 875 Comment
  CHSC107282  Frankenia salina L. P. Janeway; B. Castro 2011-7-9 10508 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. 54 Comment
  CHSC50803  Frankenia salina Vernon Oswald 1990-7-3 4411 Colusa Four Mile Rd ca. 4.5 mi n of Maxwell-Colusa Rd, ca. 6 mi (air) northeast of Maxwell. Along the edge of the road. 27 Comment
  CHSC59735  Frankenia salina K. R. Stern 1980-6-30 6652 Colusa Vernal pool, south central border area of Colusa National Wildlife Refuge. 45 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
  UC931959  Frankenia salina Verne Grant and Alva Grant 1946-8-6 7841 Colusa near Colusa (Butte Outing Gun Club) Comment
  UCD81898  Frankenia salina G. Harrington 2009-6-18 81 Colusa BLM Bear Creek (formerly Payne) Ranch. Lands to the SW of the junction of Hwys 16 and 20. S end of Cowboy Camp. E side of Bear Creek. 307 Comment
  CHSC76343  Fraxinus dipetala L. P. Janeway; B. Castro 1999-7-5 6500 Colusa Along Goat Mountain Road on south side of Little Stony Creek about 0.2 mi west of Trout Creek. Steep north facing shrubby slope. 530 Comment
  CHSC79774  Fraxinus dipetala L. P. Janeway; B. Castro 2000-5-2 6697 Colusa Vicinity of Grapevine Creek and Sites-Lodoga Road. 256 Comment
  UCD57451  Fraxinus dipetala Gina Darin; with Plant Biology 102 2007-4-29 6 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. Along trail, north side of Thompson Creek. 377 Comment
  CHSC75732  Fraxinus latifolia Vernon H. Oswald; Lowell Ahart 1999-6-22 9779 Colusa Lily Pond near Upper Letts Lake west of Stonyford. 1243 Comment
  UCD122067  Fraxinus latifolia E. L. Hyde 1932-10-1 s.n. Colusa Miller's Landing. Comment
  UC1613366  Fritillaria Charles M. Belshaw April 1937 2863 Colusa vicinity of Cook's Spring (Devil's Ridge); Devil's Ridge Comment
  RSA589939  Fritillaria Michael A. Vincent, Robert Rhode 1996-3-30 7305 Colusa Along Brim Road, 2.9 mi W jct Bear Valley Rd. Comment
  CAS-BOT-BC130330  Fritillaria glauca Greg de Nevers; S. Charnley 1995-5-27 10734 Colusa Snow Mountain 2133 Comment
  CAS-BOT-BC130432  Fritillaria pluriflora Gladys L. Smith 1978-3-18 4800 Colusa Bear Valley, on Wilbur Springs Road 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
  CAS-BOT-BC130437  Fritillaria pluriflora Arthur Menzies; Barbara Menzies 1968-3-22 s.n. Colusa Bear Valley (Between Wilbur Springs & Leesville) 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
  RSA481919  Fritillaria pluriflora Aaron Liston 1988-3-16 700 -1 Colusa Bear Valley 400 Comment
  UC1179069  Fritillaria pluriflora Herbert L. Mason 1947-3-30 13165 Colusa 0.5 mi e of Lake County Line (on Williams-Lower Lake Highway, western Colusa County); Williams-Lower Lake Highway Comment
  UCR261614  Fritillaria pluriflora Ann Howald 2003-3-11 2277 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, peninsula c. 2.2 miles north of Lodoga 365 Comment
  SEINET8478939  Fritillaria pluriflora W. Roderick 1967-3-20 s.n. Colusa Bear Valley. Comment
  HSC62768  Fritillaria purdyi M. Dean Griswold Jr. 1979-4-14 16 Colusa 1067 Comment
  JEPS54480  Galium G. L. Stebbins 1966-6-6 Colusa s Little Stony Creek (just sw of junction with Frenzel Creek); Lovelady Ridge 457 Comment
  CDA14917  Galium andrewsii G. F. Hrusa 1993-5-2 10862 Colusa North Coast Ranges; Frenzel Creek Research Natural Area. Mendocino National Forest. Above Frenzel Creek, tributary of Little Stony Creek. Comment
  UCD66703  Galium andrewsii Craig D. Thomsen 2001-4-12 2451 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
  CHSC43737  Galium andrewsii subsp. andrewsii Vernon Oswald 1986-5-12 2012 Colusa Brim Rd. (Bartlett Springs Rd.) 2.1 mi W of Bear Valley Rd. 487 Comment
  HSC45711  Galium aparine Sheila Logan 1978-4-22 85 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  UCD64439  Galium aparine Craig D. Thomsen 2000-3-31 2079 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
  CDA15479  Galium californicum subsp. flaccidum G. F. Hrusa, WTD 1998-6-19 14616 Colusa North Coast Ranges; Goat Mtn. Rd. approx. 1 km. below intersection with USFS Pacific Ridge Rd. (M5). Comment
  CHSC91041  Galium grayanum var. nanum D. Isle 2003-6-12 375 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. On Colusa/Lake County line, 1/8 mi. SE of Goat Mt. Lookout. 1841 Comment
  JEPS88931  Galium grayanum var. nanum Milo S. Baker 1929-7-1 3516 b Colusa near top Snow Mt. Comment
  CDA15454  Galium murale T. Gantenbein 1999-4-16 PDR 1198688 Colusa Central Valley; north Arbuckle. 0 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
  JEPS80877  Galium parisiense L. R. Heckard and J. C. Hickman 1980-7-3 5364 A Colusa slopes about Summit Springs (sw slope of mt); Snow Mt. 1554 Comment
  UCD72471  Galium parisiense Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3805 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
  UCD82466  Galium parisiense Craig Thomsen; G. Harrington 2009-5-12 2843 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  UCR212309  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 mi west of Hwy 20/16 intersection, milepost 3.00 310 Comment
  UC1212112  Galium porrigens Francia Chisaki and Gene B. Newcomb 1958-6-19 1166 Colusa on John Smith Road (Goat Mt.-Stonyford Road) Comment
  UCD57343  Galium porrigens Sergio Testa 2007-3-25 1 Colusa BLM Payne Ranch. Destinella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 560 Comment
  UCD66527  Galium porrigens Craig D. Thomsen 2000-4-28 2228 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on north side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 2.80. Comment
  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
  UCD121929  Galium tricornutum Barrie Stanfield 1966-4-16 25 Colusa 4 miles north of Wilbur Springs. Comment
  CDA12797  Garrya congdonii G. F. Hrusa 1996-2-26 12632 Colusa Serpentine Flora of California; above Little Stony Creek, on Goat Mtn.Rd. approx. 2.5 miles SE of Stonyford-Lodoga Rd. Comment
  POM163456  Garrya flavescens subsp. congdonii Roxana S. Ferris 1926-4-23 6456 a Colusa Between Leesville and Stonyford four miles from Stonyford. Comment
  CDA5308  Gaura neomexicana Kingwill Jun 1944 Colusa 0 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
  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
  UCD82816  Geranium dissectum Craig Thomsen; G. Harrington 2009-5-12 2890 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  UCD64432  Gilia capitata Craig D. Thomsen 2000-5-11 2323 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
  UCD66536  Gilia capitata Craig D. Thomsen 2001-5-24 2488 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
  SEINET12278770  Gilia capitata C. L. Abbott 1926-1 s.n. Colusa Colusa Comment
  UC1613303  Gilia capitata Charles M. Belshaw April, 1937 2870 Colusa Inner North Coast Range. Vicinity of Cook's Spring, Devil's Ridge. 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
  CHSC94881  Gilia capitata subsp. capitata Lowell Ahart 2006-6-11 12676 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
  JEPS108813  Gilia capitata subsp. capitata Lowell Ahart 2006-6-11 12676 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
  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
  POM163453  Gilia tricolor Roxana S. Ferris 1926-4-23 6403 Colusa Grade beyond the Mountain House on the Williams-Stonyford Road. Comment
  UCD56682  Gilia tricolor Gordon Harrington 2007-3-25 4 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
  SEINET5732133 Image available Gilia tricolor Mary Jane York 1969-1 12 Colusa In an open valley, soil dry, Bear Valley, 9.5 miles north of State Highway 20.; Bear Valley Comment
  CHSC59999  Gilia tricolor subsp. tricolor Carole Pauls 1975-4-20 1 Colusa Pasture. Bear Valley Road, 8.7 miles north of State Highway 20. Comment
  UC719300  Gilia tricolor subsp. tricolor F. G. Meyer 1938-4-5 1356 Colusa about 10 mi w Williams; w of Williams Comment
  CHSC79484  Githopsis specularioides B. Castro; L. P. Janeway 2000-5-4 1141 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 248 Comment
  HSC45716  Githopsis specularioides Sheila Logan 1978-4-22 61 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  SEINET10464558  Githopsis specularioides King 1905-1 King s.n. Colusa College City Comment
  UCD72441  Githopsis specularioides G. L. Webster; June McCaskill, Robert Rhode, John Tucker 1993-5-16 7781 Colusa 0.3 mi SW of McCloud Bridge. 335 Comment
  CHSC113040  Glinus lotoides Lowell Ahart 2013-10-1 19074 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
  JEPS104408  Glinus lotoides Lowell Ahart 2003-10-23 10668 Colusa On the e strand 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
  UCD66923  Glinus lotoides Craig D. Thomsen; G. Harrington 2008-7-6 2775 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
  CHSC115630  Glinus lotoides David Isle; Rhonda Isle 2014-9-27 2140 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). Comment
  JEPS127599  Glinus lotoides David Isle with Rhonda Isle 2014-9-27 2440 Colusa W side of East Park Reservoir, ca 0.3 miles S of boat launch, ca 100 yards E of normal lake edge. Comment
  CHSC92602  Glyceria striata D. Isle 2005-7-14 1143 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. In first perennial drainage west of junction 17N09 diagonal 17N10 about 40 yards above culvert crossing 17N09. Waypoint BDCMP 1: NAD27 10S 0523113E 4350662N. Comment
  CAS-BOT-BC303889  Gnaphalium palustre Roxana Stinchfield 1916-6-17 289 Colusa At Tule Levee, near College City Comment
  JEPS110101  Gnaphalium palustre Lowell Ahart 2006-8-9 13124 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  JEPS75841  Gnaphalium palustre L. R. Heckard 1974-9-10 3915 Colusa ne slope of West Peak (Snow Mt., along dry creek bed near seep area); Snow Mt., West Peak 2011 Comment
  JEPS80185  Gnaphalium palustre L. R. Heckard with J. Hickman 1980-7-3 5337 Colusa just w of Summit Springs (sw of Snow Mt. (ca. 10 mi w of Stonyford), Colusa-Lake County boundary) 1548 Comment
  CHSC50794  Grindelia camporum var. camporum Vernon Oswald 1990-7-30 4410 Colusa Maxwell-Colusa Rd just east of Two Mile Rd, ca. 2 mi east of Maxwell. Between road and irrigation ditch. 27 Comment
  UC1051714  Grindelia hirsutula Helen K. Sharsmith 1953-6-19 4264 Colusa near confluence North and Middle Fork Stoney Creek (Red Bridge Camp, North Fork Stoney Creek, Middle Fork Stoney Creek); Inner North Coast Ranges, Mendocino Natl Forest, North- Midd 548 Comment
  UCD146597  Grindelia hirsutula G. F. Hrusa 1998-6-19 14598 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
  SEINET266959  Grindelia hirsutula var. davyi Meredith A. Lane 1986-9-8 3108 Colusa 2 mi E of Colusa on CA state hwy 20. Comment
  RSA0016943  Grindelia hirsutula var. davyi C. B. Wolf 1928-5-8 2126 Colusa 3 miles S of Arbuckle, Pacific Hwy. Comment
  UC71636  Guillenia lasiophylla Miss Alice King 1905-1 Colusa College City Comment
  JEPS80117  Hackelia amethystina L. R. Heckard with J. Hickman 1980-7-1 5275 Colusa n side of East Peak; Snow Mountain 2072 Comment
  CHSC91036  Hackelia micrantha D. Isle 2003-6-25 378 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. GPS: 10S 0524627E 4345811N. 1731 Comment
  UCD36223  Hainardia cylindrica Beecher Crampton 1953-4-29 1143 A Colusa Colusa County, 2 miles east of Maxwell. 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
  UCD85150  Hainardia cylindrica Beecher Crampton 1958-6-27 4988 Colusa 3.5 miles south of Colusa. Comment
  CAS-BOT-BC302201  Harmonia hallii G. L. Stebbins 1971-6-6 8013 Colusa South end of Walker Ridge, near Clyde Mine 914 Comment
  UCD82590  Harmonia hallii Craig D. Thomsen; J. Wiegand, S. Harrison, G. Harrington, A. Fulks 2008-4-22 2735 Colusa Walker Ridge. About 3.2 mi N of Hwy 20, adjacent to abandoned road leading back to Walker Ridge Rd. from 'Oak Cove. 822 Comment
  CDA34807  Harmonia hallii Peter Warner 2010-5-16 155 Colusa Walker Ridge Road, ~8.3 km N of jct. with Hwy. 20, ~1 km N of jct with Indian Valley Reservoir Rd., at road cut, both sides and adjacent slopes. Comment
  UCD170090  Helianthemum scoparium Jack Alderson 2016-9-3 s.n. Colusa BLM Bear Creek Ranch (formerly Payne Ranch); 5100 feet (1555 m) south of the confluence of Brophy Creek with Bear Creek. 472 Comment
  UCD144347  Helianthus bolanderi G. F. Hrusa 1998-10-28 14897 Colusa Inner North Coast Ranges. Along Cedar Camp Road as it enters Little Stony Creek Canyon. Approximately 1/2 mile from Lodoga/Stonyford Road. 400 Comment
  RSA126696  Helianthus bolanderi Peter H. Raven, Richard Snow 1959-9-11 14424 Colusa About 2 miles south-east of Happy Camp 762 Comment
  CHSC84973  Heliotropium curassavicum Lowell Ahart 2003-10-23 10663 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
  UCD72395  Heliotropium curassavicum Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5121 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Southwestern part of ranch, upslope of confluence of Bear and Cache Creeks. Along old hunting lamp road southeast (downslope) of junction with ridge trail. 384 Comment
  UCD72470  Heliotropium curassavicum Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3804 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
  RSA0105551  Heliotropium curassavicum subsp. oculatum Lowell Ahart 2013-10-1 19096 Colusa Inner North Coast Range. East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  POM64436  Heliotropium curassavicum var. oculatum Roxana Stinchfield 1916-6-17 281 Colusa Near Tule College City. Comment
  CHSC84971  Helminthotheca echioides Lowell Ahart 2003-10-23 10661 Colusa Along Squaw Creek, just south of East Park Reservoir, about 1/8 mile northwest of Sites Lodoga Road, about 1 mile north of Lodoga, about 21 miles west of Maxwell. 368 Comment
  UCD82509  Hemizonia Craig Thomsen; G. Harrington 2009-5-12 2867 b Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 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
  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
  RSA0115040  Hemizonia congesta subsp. clevelandii Lyman Benson 1948-7-16 12923 Colusa Road between Williams and Clear Lake just east of Lake Co. line. Mt. Range: Inner North Coast. 548 Comment
  CHSC77309  Hemizonia congesta subsp. luzulifolia Heidi West; Joyce Lacey-Rickert 1998-10-29 Colusa Vicinity of Antelope Valley and Sites. 109 Comment
  UC725797  Hemizonia congesta subsp. luzulifolia A. A. Heller 1939-10-1 15482 Colusa between Williams Maxwell Comment
  UCD61448  Hemizonia congesta subsp. luzulifolia Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3893 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
  UCD72483  Hemizonia congesta subsp. luzulifolia Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3817 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, along trail that beings approximately across from BLM parking lot, located at south end of bridge. 256 Comment
  UCD70224  Hemizonia luzulifolia D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. Annual grasslands growing on ultramafic soils. 370 Comment
  UCR225657  Hemizonia parryi Craig D. Thomsen, Gordon Harrington 2008-7-6 2784 Colusa BLM Payne Ranch. Lands to the SW of the jct of Hwys 20 and 16. Near valley at the bottom of Lynch Canyon at the junction of Thompson and Lynch Creeks. Informal name for the building in the area is 'Roadkill Cafe.' Small stockpond c. 0.2 miles to the south of the Roadkill cafe. 396 Comment
  CHSC112922  Hesperevax acaulis var. robustior B. Castro; L. Janeway, Robin Carter 2010-3-23 1801 Colusa Vicinity of Golden Gate in Logan Ridge, Funks Reservoir, and the Tehama-Colusa canal, in disturbed, grazed annual grassland. 121 Comment
  CHSC79092  Hesperevax caulescens B. Castro; C. Warren 2000-4-3 1045 Colusa Vicinity of Antelope Valley, Sites-Lodoga Rd, and Grapevine Ck. 164 Comment
  CHSC86871  Hesperevax caulescens B. Castro; Beth Hendrickson 2003-4-7 1415 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Grapevine Creek. 184 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
  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
  CHSC71435  Hesperolinon californicum Vernon H. Oswald; Lowell Ahart 1998-7-15 9269 Colusa Bartlett Springs Rd. 1.6 mi west of Bear Valley Rd. 487 Comment
  JEPS122821  Hesperolinon californicum W. A. Freyman with A. C. Schneider & Y. P. Springer 2014-5-20 288 Colusa Along north side of Goat Mountain Road west of Lodoga. 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
  UC867722  Hesperolinon californicum A. A. Heller 1916-6-6 12352 Colusa on the grade about 3 mi w Leesville; Coast Range Comment
  UCD81215  Hesperolinon californicum Ellen Dean; K. Mawdsley, B. Rice, G. Harrington, and J. Alderson 2009-5-6 5552 Colusa Payne Ranch, lands to the SW of the jct. of Hwys. 16 and 20. Destinella Flat area on the S side of Hwy. 20. Top of ridge to the E of Destanella Flat. 578 Comment
  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
  SD51765  Hesperolinon congestum Helen K. Sharsmith 1952-6-21 4159 Colusa North canyon slope overlooking Cooks Springs. 548 Comment
Read comments
Jul 18 2010
  CHSC83165  Hesperolinon disjunctum Beecher Crampton 1995-6-4 10323 Colusa Colusa-Lake County Border: State Highway 20. 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
  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
  UC1552831  Hesperolinon disjunctum Frederica Bowcutt 1985-5-5 507 Colusa ca 1 mi nw Wilbur Springs Comment
  UCD67057  Hesperolinon disjunctum Craig D. Thomsen 2008-5-23 2752 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. 470 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
  RSA151803  Hesperolinon disjunctum H. K. Sharsmith 1951-7-13 4031 Colusa Fouts Springs, near Mill Creek at junction with road to Black Diamond Ridge, Mendocino National Forest. 457 Comment
  CAS-BOT-BC167448  Hesperolinon drymarioides Helen K. Sharsmith 1952-6-21 4159 Colusa North canyon slope overlooking Cook Springs 548 Comment
  CHSC111651  Hesperolinon drymarioides David Isle; Niall McCarten, Roxanne Bittman 1987-5-26 2062 Colusa Mendocino National Forest - North Coast Ranges Little Stony Creek Watershed. On N slope openings in serpentine chaparral N of Cook Springs (at end of rd). 463 Comment
  UC1212304  Hesperolinon drymarioides Helen K. Sharsmith 1952-6-21 4159 Colusa n canyon slope overlooking Cook Springs; Inner North Coast Ranges 548 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
  UCD66692  Hesperolinon micranthum Craig D. Thomsen 2000-6-23 2373 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  CHSC118362  Heteranthera dubia Dean Wm. Taylor 2014-5-18 21476 Colusa 3.5 miles southwest of Maxwell; eastern bank of the Glenn-Colusa Canal downstream of the crossing of Fairview Road. 35 Comment
  JEPS60199  Heterocodon rariflorum L. R. Heckard 1969-5-28 2235 Colusa about 6 air mi w Stonyford (along Stony Creek at Fout Springs); Stony Creek, Fout Springs 518 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
  UCD55466  Heteromeles arbutifolia Ellen Dean; Gordon Harrington 2006-10-6 3291 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 362 Comment
  UCR206401  Heteromeles arbutifolia George K. Helmkamp, E. A. Helmkamp 2009-3-11 14376 Colusa Inner North Coast Range Foothills, along CA-20, 14.3 miles southwest of Williams 375 Comment
  JEPS2447  Heterotheca oregona var. rudis W. L. Jepson 1887-9-17 14677 Colusa in bed of Putah <Creek> Putah 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
  RSA86288  Hibiscus lasiocarpos Verne Grant 1946-8-6 7837 Colusa Butte Creek, 1 mile north of Butte Outing Gun Club, near Colusa. Comment
  RSA93450  Hibiscus lasiocarpos Milo S. Baker 1946-9-4 11608 Colusa Butte Sink, near gate of Colusa Gun Club Comment
  CHSC25319  Hibiscus lasiocarpos var. occidentalis Hayes; Warner, Schlising 1977-8-23 49 Colusa Along Putnam Rd., where this road reaches the Butte Creek Drainage, off of Gridley road 5. 50 Comment
  CDA20339  Holocarpha virgata D. Brown 2001-10-17 PDR 024366 Colusa Northern California; Vicinity of Colusa 0 Comment
  CAS-BOT-BC383129  Holocarpha virgata subsp. virgata Andrew Townesmith; Karen M. Meyer 2007-8-7 907 Colusa Mendocino National Forest, Grindstone Ranger District. Vicinity of Wolf Creek OHV staging area, off Forest Service route M10, 4.2 miles west of intersection with Lodoga-Stonyford road in Stonyford 452 Comment
  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
  RSA28813  Holodiscus discolor A. A. Heller 1916-6-6 12362 Colusa Coast Range on the grade 3 miles W 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
  UCD61443  Hordeum brachyantherum Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3888 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 NW of parking lot. 339 Comment
  UCD82472  Hordeum brachyantherum Craig Thomsen; G. Harrington 2009-5-12 2848 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  UCD85417  Hordeum brachyantherum D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. 370 Comment
  CHSC112029  Hordeum brachyantherum David Isle; Rhonda Isle, Justin Isle 1988-5-22 2098 Colusa Mendocino National Forest, Pendell Ranch, S of Fouts Springs Rd 18N01 (M10), ~2 miles W of Co. Rd. ~150 yds south of Pendel home. 384 Comment
  UC1745700  Hordeum brachyantherum subsp. brachyantherum Annetta M. Carter, Sarah Dyal, Ethel Crum 1938-5-8 1391 Colusa 5.5 mi. S of Leesville. Bear Valley. 426 Comment
  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
  CAS-BOT-BC285062  Hordeum marinum subsp. gussoneanum L. R. Abrams 1928-5-8 12593 Colusa 2 miles south of Arbuckle 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
  CHSC111692  Hordeum marinum subsp. gussoneanum David Isle; Rhonda Isle, Justin Isle 1988-5-22 2099 Colusa Middle Fork Stony Creek Watershed. Field S of Pendell home, S of Fouts Springs Rd 18N01 (M1)), 2 miles W of Co. Rd. 306 jct. w/Fouts Springs Road. 384 Comment
  SEINET3271561 Image available 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
  RSA669471  Hordeum murinum subsp. glaucum R. R. Halse 2001-3-22 5946 Colusa Williams, along vacant lot by 455-4th street. 18 Comment
  UCD86153  Hordeum murinum subsp. leporinum Beecher Crampton 1962-4-17 6214 Colusa Sycamore. Comment
  UCD106062  Hosackia crassifolia Freed W. Hoffman 1948-6-27 2515 Colusa Upper Letts Valley, 8.6 miles south of Fouts Springs, western part of county. Comment
  UCD146730  Hosackia crassifolia var. crassifolia G. F. Hrusa 1998-6-19 14617 Colusa North Coast Ranges. Along USFS Pacific Ridge Road. (M5) Above intersection with Goat Mountain Road. 1120 Comment
  JEPS80063  Hydrophyllum occidentale L. R. Heckard and J. Hickman 1979-6-15 5069 Colusa saddle between e and w peaks Snow Mt. 2103 Comment
  UCD110369  Hypericum perforatum subsp. perforatum Jack Booth 1973-6-14 s.n. Colusa State Highway 20, 2 miles west of junction with State Highway 16. Comment
  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
  UCD57109  Hypochaeris glabra Gordon Harrington; Diana Hickson 2007-4-7 0022 Colusa Colusa Co. Ca. BLM Payne Ranch, SW intersection of Hwy 16 and Hwy 20, approx. 1/5 to 1/2 mile W of Roadkill Cafe on old fuel break. 442 Comment
  UCD82460  Hypochaeris glabra Craig Thomsen; G. Harrington 2009-5-12 2838 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  RSA0013872  Ibicella lutea J. C. Roos, L. Roos 1948-9-2 4024 Colusa West of Williams at edge of foothills. Comment
  CDA15768  Iris macrosiphon G. F. Hrusa 1993-5-2 10853 Colusa North Coast Ranges; Frenzel Creek Research Natural Area - Mendocino National Forest. Lower Frenzel Creek, tributary of Little Stony Creek. Comment
  SEINET3876025  Iris macrosiphon J. L. Hobson, class 1974-5-4 59 Colusa 0.75 mi. from the junction to Indian Valley on Walker Ridge Rd. Wilbur Springs Quad.; 0 853 Comment
  CHSC84195  Juncus balticus Lowell Ahart 2003-7-14 10384 Colusa Along a stream, field on the south side of Highway 20, about 2 miles southwest of the intersection of Highway 20 and Bear Valley Road, about 21 miles (by road) southwest of Williams. 520 Comment
  JEPS80274  Juncus balticus L. R. Heckard, and J. Hickman 1980-9-16 5460 Colusa nw slope West Peak (cirque area between peaks, Snow Mt.); Snow Mt., West Peak 2011 Comment
  JEPS80247  Juncus bolanderi L. R. Heckard and J. C. Hickman 1980-9-15 5425 Colusa w of Summit Springs; Snow Mt. 1554 Comment
  JEPS80753  Juncus bolanderi L. R. Heckard and J. C. Hickman 1981-7-29 5718 Colusa s side Snow Mt. (around Summit Springs); , Summit Springs 1554 Comment
  CHSC101403  Juncus bufonius var. congestus David Isle 2006-5-6 1571 Colusa East of Maxwell abt 1 mile; S of Maxwell Rd and e of Lyons Rd in north Dirk's organic rice field (check). 30 Comment
  CHSC81326  Juncus bufonius var. congestus Caroline Warren; Jenny Marr, Heidi West, Natalie Wight 1998-6-11 Colusa Vicinity of Funks Creek and Logan Ridge. 106 Comment
  JEPS75719  Juncus ensifolius L. R. Heckard 1974-9-9 3850 Colusa just se Foutch Camp; Snow Mt. 1889 Comment
  JEPS80270  Juncus ensifolius L. R. Heckard and J. Hickman 1980-9-16 5453 Colusa e of West Peak (first meadow along trail from Frog Pond in cirque area); Snow Mt. 1981 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
  JEPS73494  Juncus laccatus L. R. Heckard 1972-7-10 3107 Colusa Trout Creek crossing of trail to Box Springs; Snow Mt. 1828 Comment
  CHSC88579  Juncus oxymeris L. P. Janeway 2001-6-6 7115 Colusa Inner North Coast Ranges. Malaney Flat, about 4.8 km (air) east of Walker Ridge Road. Large open meadow. 610 Comment
  CHSC79616  Juncus patens L. P. Janeway 2000-5-31 6777 Colusa Inner North Coast Ranges. At Candy Bucket Springs, on the south side of canyon of Stony Creek. 628 Comment
  UCD82439  Juncus patens Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5665 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
  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
  CHSC107172  Juncus xiphioides L. P. Janeway; 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. Large +- alkaline vernal pool/marsh; mucky clay soil. In and adjacent to a shallow swale that drains north into the marsh which is 3 m lower in elevation. 52 Comment
  CHSC116398  Juncus xiphioides David Isle 2014-6-7 2133 Colusa North Coast Range: About 1 mile south of Stonyford, California. On west bank of Salt Creek, just north of 2nd curve north of bridge on Dennis Drive. On David and Rhonda Isle property. (Waypoint is on Dennis Drive Bridge over Salt Creek.) 10 -0538832E, 4357208N. Comment
  UCD142823  Juncus xiphioides A. A. Heller 1916-6-9 12389 Colusa about 8 miles west of Williams. Comment
  UCD70298  Juniperus californica D. Sanchez-Mata 1998-7-9 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain Road between Lodoga and Red Rock Cabin. Open California juniper woodland (Juniperus californica). 420 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
Read comments
Jul 25 2018
  JEPS80759  Keckiella lemmonii L. R. Heckard and J. C. Hickman 1981-7-29 5726 Colusa s side Snow Mt. (along trail from Summit Springs) 1706 Comment
  CHSC32198  Kelloggia galioides James Jokerst 1980-8-8 1083 Colusa North Coast Ranges. Near Snow Mountain (west). 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
  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
  UCD66874  Lactuca saligna Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5077 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
  CHSC112312  Lagophylla minor Lowell Ahart 2013-5-1 18680 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
  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
  JEPS85534  Lagophylla minor L. R. Heckard 1969-5-28 2232 A Colusa Letts Valley Rd. ca 8 mi sw Stonyford (NE slope of Potato Hill); Potato Hill 762 Comment
  UCD66601  Lagophylla minor Craig D. Thomsen 2000-5-11 2276 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
  JEPS39671  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
  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
  JEPS80244  Lagophylla ramosissima L. R. Heckard and J. Hickman 1980-9-15 5419 Colusa slopes w of Summit Springs; Snow Mt. 1554 Comment
  SEINET9310484  Lagophylla ramosissima Unknown 2009-5-20 14740 Colusa Central Inner Coast Ranges: along CA-16 near Bear Creek, 1.6 miles S of the jct with CA-20 (Glasscock Mountain 7.5' W). Chaparral and oak woodland. Occasional on open flat in disturbed soil. Comment
  UCR206352  Lagophylla ramosissima George K. Helmkamp, E. A. Helmkamp 2009-5-20 14740 Colusa Central Inner Coast Ranges, along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 320 Comment
  CAS-BOT-BC341471  Lagophylla ramosissima Bruce G. Baldwin 1985-6-1 484 Colusa 3.2 miles north of junction with California State Highway 20 along Bear Valley Road Comment
  UCD135735  Lagophylla ramosissima Bruce G. Baldwin 1986-6-1 484 Colusa 3.2 miles north of junction with California State Highway 20 along Bear Valley Road. Comment
  CHSC89865  Lagophylla ramosissima subsp. ramosissima B. Castro; L. Janeway 2001-4-12 1229 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Ck in hilly open blue oak woodland. In grassy understory on relatively flat ridgetop. 170 Comment
  UCD56930  Lamium amplexicaule Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3533 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Thompson Canyon. 353 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
  POM53876  Lasthenia ferrisiae Roxana S. Ferris 1917-4-12 503 Colusa 4 miles east of Williams. Comment
  UC90030  Lasthenia ferrisiae K. Brandegee Apr 1889 Colusa Colusa Junction Comment
  CHSC107929  Lasthenia glaberrima B. Castro; L. Janeway 2011-4-27 1862 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; approximately 1 mi southeast of Funks Reservoir and 800 ft northeast of Tehama-Colusa Canal. Approximate center of large +- alkaline marsh. 49 Comment
  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
  CHSC29752  Lasthenia glabrata K. R. Stern 1980-4-1 6619 Colusa Vernal pool, south border area of Delevan National Wildlife Refuge. 48 Comment
  UCD163320  Lasthenia glabrata Craig D. Thomsen 1997-4-20 1919 Colusa Bear Valley. About 6 miles north of Hwy 20. Comment
  HSC72114  Lasthenia glabrata J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9529 Colusa Bear Valley Rd., 5 mi. from its junction with Hwy. 20 390 Comment
  UC583164  Lasthenia glabrata subsp. glabrata Lewis S. Rose 1936-4-27 36184 Colusa 15 mi nw Rumsey 304 Comment
  POM914476  Lasthenia glabrata subsp. glabrata L. S. Rose 1936-4-27 36184 Colusa 15 miles NW of Rumsey. 305 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
  CHSC53935  Lasthenia minor Vernon H. Oswald 1991-4-21 4527 Colusa Four Mile Rd, 3.1 mi south of Norman Rd, west-southwest of Princeton. Along the edge of the road. 27 Comment
  UC90010  Lasthenia platycarpha T. S. Brandegee 1889-4-12 Colusa Colusa Junction Comment
  POM163503  Lathyrus Roxana S. Ferris 1926-4-22 6205 Colusa Near Sycamore. Comment
  JEPS127615  Lathyrus jepsonii var. californicus B. Castro with Tom Boullion 2008-6-4 1733 Colusa Ca 5 air miles N of Colusa, ca 0.5 mi E of Hwy 45 off N edge of Reservation Road. On upper terrace within levee, overlooking riprap-lined bend in the Sacramento River (River-mile 154.3). Comment
  UCD82127  Lathyrus jepsonii var. californicus Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5656 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
  UCSB3094  Lathyrus nevadensis Keator, Glenn 1958-6-18 Colusa Near Bartlett Springs Comment
  UCD80896  Lathyrus vestitus Ellen Dean; G. Harrington 2009-3-27 5296 Colusa BLM Bear Creek (Payne) Ranch, lands to the SW of the jct of Hwys 16 and 20. Along road that connects Lynch Canyon and the Ridge Trail on slope above road. 453 Comment
  HSC95475  Lathyrus vestitus subsp. vestitus A. Skelly, B. Bletcher, G. McCabe 1996-3-30 10 Colusa 1.6 mi. W of Bear Valley Rd. and Brim Rd. on Brim Rd., 14.7 mi. on Walker Ridge Rd. to Brim Rd., 57 mi. E of Hwy. 101 on Hwy. 20, Leesville Comment
  CHSC62933  Lathyrus vestitus var. vestitus Vernon H. Oswald; Lowell Ahart 1994-4-6 6070 Colusa Goat Mtn. Rd. 0.3 mi S of Sullivan Creek Bridge, SW of Digger Pine Flat, S of Stonyford. 487 Comment
  JEPS88897  Lathyrus vestitus var. vestitus Vernon H. Oswald and Lowell Ahart 1994-4-6 6070 Colusa 0.3 mi s of Sullivan Creek Bridge (Goat Mountain Rd, sw of Digger Pine Flat, s of Stonyford); Goat Mountain Rd 487 Comment
  CAS-BOT-BC323885  Layia chrysanthemoides Joshua Suchocki; Charlene Vullo; Kyle Wear 1995-4-1 44 Colusa Along Bear Valley Rd. 1.2 miles S of the junction with Brim Rd. 414 Comment
  CAS-BOT-BC323902  Layia chrysanthemoides Ethel Crum 1938-5-8 2038 Colusa Bear Valley, 4 miles S of Leesville. 426 Comment
  CHSC9545  Layia chrysanthemoides J. M. Barnum 1968-3-30 60 Colusa Annual stream, 50 ft. s of hwy. 20, 18 mi sw of Williams. 1/4 mi w of junction of hwy. 16. 548 Comment
  HSC87057  Layia chrysanthemoides Pat Daly, Rudy Galindo 1988-4-17 61 Colusa 5.2 mi. S on Bear Valley Rd. 390 Comment
  HSC92628  Layia chrysanthemoides Eric B. Peterson, Thomas Ward, Matt Foruria 1995-4-1 54 Colusa Bear Valley Rd., 1.2 mi. S of its junction with Brim Rd. 415 Comment
  UC638649  Layia chrysanthemoides Ethel Crum 1938-5-8 2037 Colusa four mi s of Leesville; Bear Valley 426 Comment
  UCD162975  Layia chrysanthemoides Jack Major 1963-5-4 s.n. Colusa Bear Valley. (Exact location unknown. Coordinates estimated by label maker.) 396 Comment
  CAS-BOT-BC323904  Layia chrysanthemoides Roxana S. Ferris 1917-4-12 506 Colusa 4 miles E of Willaims. Alkali Plains. Comment
  SEINET5712162  Layia chrysanthemoides Clinton C. Shock 1980-1 64 Colusa Bear Valley, ca. 12 miles north of State Hwy 20; west edge of valley.; Bear Valley 390 Comment
  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
  HSC85782  Layia fremontii Jeff Dunk, Tallchief Comet, David Munger 1987-4-12 66 Colusa Comment
  UCD15425  Layia fremontii Margit Sands 1985-4-13 28 Colusa in Bear Valley, 3.8 miles north of Wilbur Hot Springs rd.; 390 Comment
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Apr 18 2009
  CHSC110419  Layia platyglossa David Isle; Rhonda Isle; Hank Switzer 2011-4-14 1950 Colusa North Coast Ranges. Bear Valley on S edge of Bear Valley R. MDBM. Comment
  JEPS119407  Layia platyglossa G. K. Helmkamp, E. A. Helmkamp 2009-1-31 14314 Colusa Sacramento Valley, junction of Moon Bend Road and CA-20 at the south end of the city of Colusa. Comment
  UCR206849  Layia platyglossa George K. Helmkamp, E. A. Helmkamp 2009-3-11 14358 Colusa Sacramento Valley, junction of Moon Bend Road and CA-20 at the south end of the city of Colusa 23 Comment
  CAS-BOT-BC380897  Layia platyglossa Ethel Crum 1936-5-8 2036 Colusa Bear Valley 4 miles south of Leesville 426 Comment
  HSC95321  Layia platyglossa Todd Bouchier, Kathleen Gifford, Cameron Williams 1999-5-1 34 Colusa Bear Valley Rd., 2 km S of Brim Rd. Comment
  SEINET11447842 Image available Layia platyglossa M. J. Williams 1967-5-7 s.n. Colusa Bear Valley 396 Comment
  JEPS13435  Layia septentrionalis R. F. Hoover 1938-4-23 3206 Colusa grade on Rumsey; Arbuckle road Comment
  UC761855  Layia septentrionalis R. F. Hoover 1938-4-23 3206 Colusa grade on Rumsey-Arbuckle road Comment
  UCR261736  Layia septentrionalis Ann Howald 2003-4-23 2307 Colusa Inner North Coast Ranges, Lodoga-Stonyford Road, c. 0.1 mile north of road crossing of Little Stony Creek 382 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
  CHSC49694  Lemna minuta Vernon Oswald 1984-7-20 1623 Colusa Lily Pond n of Letts Lake in Mendocino National Forest. In a pool where meadow drains beneath road. 1280 Comment
  UCD67066  Lepechinia calycina Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5094 -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. 554 Comment
  CAS-BOT-BC88675  Lepidium acutidens A. A. Heller 1921-4-10 13542 Colusa Near Colusa. Comment
  HSC101408  Lepidium chalepense J. P. Smith 2011-4-27 13143 Colusa Along Hwy. 16, 1.3 mi. S of junction with Hwy. 20 315 Comment
  UCD63714  Lepidium draba Craig D. Thomsen 2008-4-7 2724 Colusa BLM Payne Ranch. Southwest of intersection of Hwy 16 and Hwy 20. Along entry road into Cowboy Camp from Hwy 16, 1 mile south of Hwy 20. Comment
  UCD63721  Lepidium draba Craig D. Thomsen 2008-5-31 2761 Colusa BLM Payne Ranch. Southwest of intersection of Hwy 16 and Hwy 20. Along entry road into Cowboy Camp from Hwy 16, 1 mile south of Hwy 20. 320 Comment
  UCD72469  Lepidium latifolium Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3803 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. Bank of Bear Creek near north end of bridge, west side of creek. 260 Comment
  CAS-BOT-BC89759  Lepidium latipes Roxana S. Ferris 1917-4-12 532 Colusa 4 miles east of Williams. Comment
  UC398784  Lepidium latipes Brandegee Apr 1889 Colusa Colusa Junction Comment
  CAS-BOT-BC89761  Lepidium latipes Brandegee s.n. Colusa Unspecified. Comment
  UCD57874  Lepidium latipes var. latipes Gordon Harrington; Diana Hickson, Jack Alderson 2007-4-29 52 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. About 250 feet north of Road Kill Cafe in flat meadow-pasture area. 385 Comment
  JEPS75064  Leptochloa fascicularis W. L. Jepson 1929-10-1 15344 Colusa Maxwell 25 Comment
  UC767153  Leptochloa fascicularis R. F. Hoover 1936-7-31 1590 Colusa Maxwell Comment
  CAS-BOT-BC273929  Leptochloa fusca subsp. fascicularis James Moffett 1928-10-1 s.n. Colusa 5 miles north of Colusa Comment
  RSA424704B  Leptosiphon bicolor Aaron Liston, M. A. Blumler 1987-4-26 667 -6 Colusa Bear Valley - Lodoga Road, 6.6 miles S of Bartlett Springs Jct. Comment
  UCD162985  Leptosiphon bicolor Craig D. Thomsen 2002-4-4 2584 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
  UCD163206  Leptosiphon bicolor Craig D. Thomsen 2000-3-31 2048 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
  HSC85934  Leptosiphon bicolor Michalski, Raum, Hopson 1987-4-12 61 Colusa Side of Leesville-Williams Rd. Comment
  UCD14330  Leptosiphon bicolor Kathi A. Zurakowski 1984-4-21 Colusa Colusa Co.; Bear Valley, 3.2 miles north of Wilbur Springs turnoff, west of road; 381 Comment
  UCD14331  Leptosiphon bicolor G. Robinson 1984-4-21 4 Colusa Colusa Co.; Bear Valley, ca. 40 meters west of Wilber Springs Road, east of creek, 3.2 miles north of Highway 20; 390 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
  CHSC19699  Leptosiphon ciliatus L. A. Wright Jr. 1971-3-27 6 Colusa Ca. 7 mi s of Williams on Hwy 30, on the n side of the road. 91 Comment
  CHSC61230  Leptosiphon ciliatus Siegel 1977-4-16 8 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 10 mi wsw of Williams. 143 Comment
  CHSC86028  Leptosiphon ciliatus 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
  HSC65995  Leptosiphon ciliatus Cathie Goldberg, Lynn Kunstman, Lauren Philbrick, Geoff Walsh 1980-4-19 51 Colusa Leesville Rd. from Leesville to Williams, 3.8 mi. E of Leesville Comment
  UCD57704  Leptosiphon ciliatus Daniel Chau; with Plant Biology 102 2007-4-29 1 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Eastern part of ranch, ca. 2 road miles south of intersection of State Routes 20 and 16. Along unimproved road in the mouth of Craig Canyon. 313 Comment
  HSC85855  Leptosiphon filipes Rob Marheine, Tim Tilghman, Bruce Delgado 1987-4-11 Colusa Bear Valley, Bartlett Springs Rd. Comment
  JEPS123230  Leptosiphon latisectus David Gowen 2010-6-14 1128 Colusa Serpentine road bank along ridgetop of Walker Ridge Road Comment
  CHSC70992  Leptosiphon parviflorus Vernon Oswald; Lowell Ahart 1998-5-7 9006 .1 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
  UCD63017  Leptosiphon parviflorus Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4669 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Slopes to the west of Cowboy Camp on the west side of Bear Creek. 404 Comment
  CHSC32205  Lesquerella occidentalis subsp. occidentalis James Jokerst 1980-8-7 1067 Colusa North Coast Ranges. Near Snow Mountain (west). Comment
  CAS-BOT-BC341800  Lessingia nemaclada M. K. Curran 1884-1-1 s.n. Colusa At Epperson's Comment
  JEPS24542  Lessingia nemaclada Peter H. Raven and R. Snow 1959-9-11 14425 Colusa about 2 mi se Happy 762 Comment
  JEPS11965  Lessingia ramulosa Rimo Bacigalupi with G. T. Robbins 1954-6-25 4621 Colusa 0.1 mi e Lake County line (e of summit of road from Bear Valley to Indian Valley) 640 Comment
  JEPS94654  Lessingia ramulosa Vernon H. Oswald and Lowell Ahart 1998-7-15 9276 Colusa on Sawtelle Valley Rd. 0.4 mi n Bartlett Springs Rd. (w side of county) 670 Comment
  UCD55454  Lessingia ramulosa Ellen Dean; Gordon Harrington 2006-10-6 3278 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
  UCD66708  Lessingia ramulosa Craig D. Thomsen 2001-5-24 2507 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.17 and 2.25. 342 Comment
  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
  CDA32489  Leymus triticoides W. C. Disney Jr. 1959-5-8 2344 Colusa Princeton area 0 Comment
  CHSC53964  Limnanthes douglasii subsp. nivea Vernon H. Oswald 1991-4-21 4517 Colusa Lodoga Stonyford Rd, ca. 2 mi south of Stonyford. Along drainages in pastures. 371 Comment
  UCD33937  Limnanthes douglasii subsp. nivea Beecher Crampton 1958-4-21 9168 Colusa Colusa County, 2 miles W.N.W. of Lodoga. Comment
  UCD143419  Linanthus Oren Pollak 1987-4-10 s.n. Colusa Bear Valley. Comment
  UCD82495  Linanthus Craig Thomsen; G. Harrington 2009-5-12 2845 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  UC106857  Linanthus androsaceus Brandegee 1889-1 Colusa Comment
  UC201776  Linanthus bolanderi Volney Rattan 1884-5-20 Colusa summit above Foute's Springs Comment
  UCD83820  Linanthus parviflorus Ellen Dean; G. Harrington, K. Mawdsley, J. Shepard 2010-5-1 5967 Colusa Walker Ridge on border of Lake and Colusa Counties, just E of Barrel Springs area along Walker Ridge Rd. 721 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
  JEPS2613  Linanthus rattanii V. Rattan Colusa summit above Fout's Springs (summit on trail to Fout's Springs from Stony Valley); ; Above Fout's Springs, Colusa Co. Comment
  JEPS76798  Listera convallarioides Alice Q. Howard 1972-7-10 4 Colusa n side of the ridge separating Trout Creek and Paradise Creek (the highest of two mossy spring areas crossing trail from Fouts Camp to Box Springs); Snow Mountain 1676 Comment
  CHSC77955  Lithophragma affine Beth Hendrickson; Heidi West 1999-3-23 Colusa Vicinity of Antelope Valley, Funks Creek, and Golden Gate. 137 Comment
  CDA34090  Lithophragma affine P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 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
  UCD81245  Lithophragma heterophyllum Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5409 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. 340 Comment
  HSC92471  Lithophragma heterophyllum Brad Kerstetter, Roxanne Jackson, Jeff Cox 1995-5-6 52 Colusa Blue Oak Campground 549 Comment
  CHSC112234  Logfia filaginoides Lowell Ahart 2013-5-1 18678 Colusa Inner North Coast Ranges. On the north side of the of the wash, north side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  UCD159333  Logfia filaginoides D. S. Park 2010-6-5 117 Colusa Walker ridge, Cold Spring Mt. roadside and adjacent grassland. 760 Comment
  HSC47737  Logfia gallica Thomas W. Nelson, Jane P. Nelson 1978-4-29 3943 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  CHSC94528  Lolium multiflorum Lowell Ahart 2006-8-9 13135 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UCD84437  Lolium perenne Jack Alderson 2009-4-19 35 Colusa BLM Bear Creek Ranch (Previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. Destinella Flat. 553 Comment
  RSA424750  Lomatium Aaron Liston, M. Blumler 1987-4-26 667 -7 Colusa Bear Valley - Lodoga Road, 6.6 miles S of Bartlett Springs Jct. Comment
  CHSC91217  Lomatium californicum D. Isle 2003-6-4 370 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. 0.2 mi. W of M-10/M-5 jct. on N. edge of M-10. 621 Comment
  OBI54946  Lomatium ciliolatum var. hooveri Robert F. Hoover 1941-5-2 4987 Colusa Just E of Lake Co. line on Williams-Clear Lake hwy 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
  UC1613425  Lomatium hooveri Charles M. Belshaw 1937-4-25 2827 Colusa Inner North Coast Range, Devils Ridge, Cooks Springs Comment
  UCD58105  Lomatium hooveri Ellen Dean; G. Harrington and P. McIntyre 2007-3-16 3352 Colusa Payne Ranch. Along Hwy. 20, just E of Lake Co. border. Ca. 3 road miles west of juncture with Hwy. 16, ca. 0.4 road mile east of Destanella Flat. South side of road. 556 Comment
  CHSC42612  Lomatium macrocarpum Vernon Oswald 1986-3-25 1053 Colusa Fouts Springs Rd. (M10) at Diversion Dam Campground 3.4 mi w of Rd. 306. 411 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
  UCD58110  Lomatium macrocarpum Ellen Dean; G. Harrington and P. McIntyre 2007-3-16 3370 Colusa Payne Ranch. Along Hwy. 20, Destanella Flat area just E of Lake Co. border. Ca. 3.4 road miles west of junction with Hwy. 16. South side of road. South of Destanella. 548 Comment
  UCD127699  Lomatium macrocarpum Grady L. Webster 1977-5-15 7681 Colusa Along Bear Creek, ca. 2 mile west of Route 20 along Wilbur Springs Road. 365 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
  JEPS17551  Lomatium utriculatum W. L. Jepson 1920-5-23 8968 Colusa near Leesville (Bear Valley, w. Colusa Co.); w. Colusa Co., Bear Valley Comment
  SEINET11587934  Lomatium utriculatum Unknown 2009-3-11 14374 Colusa Williams Comment
  UC630428  Lomatium utriculatum Annetta Carter 1938-5-8 1387 Colusa 3 mi. n. Leesville (on Lodoga rd.); Inner N. Coast Range Comment
  UCD57818  Lomatium utriculatum Gordon Harrington 2007-4-17 30 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. 527 Comment
  UCD57859  Lomatium utriculatum Gordon Harrington 2007-4-17 29 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. 553 Comment
  CHSC116047  Lomatium vaginatum Richard R. Halse 2014-3-25 9028 Colusa Along the Sites-Logoda Road ca. 5.2 miles northwest of Sites. 175 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
  UCD67120  Lonicera involucrata Ellen Dean; Davis Botanical Society 2008-5-31 5053 Colusa west of I-5 at Maxwell, north slope of Goat Mountain, along Letts Valley Rd. between Goat Mountain Summit and Fouts Springs, east side of road. Comment
  CHSC48018  Lonicera involucrata var. ledebourii Vernon Oswald 1984-7-20 1618 Colusa Letts Lake in Mendocino National Forest. Comment
  CHSC86839  Lotus corniculatus 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
  JEPS60200  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
  JEPS60204  Lotus grandiflorus var. grandiflorus L. R. Heckard 1969-5-29 2240 Colusa about 6.5 air mi se Stonyford (along Trough Spring Ridge road, 0.2 mi n of its junction with Crackerbox Ridge road) 1127 Comment
  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
  RSA516409  Lotus grandiflorus var. mutabilis L. R. Heckard 1969-5-28 2236 Colusa Along Trough Spring Ridge road 1/2 mile southwest of its junction with the Stonyford-Fouts Spring road (about 5 miles west of Stonyford). 732 Comment
  RSA516411  Lotus grandiflorus var. mutabilis L. R. Heckard 1969-5-28 2233 Colusa On road above and west of Fouts Springs. Comment
  RSA424761  Lotus humistratus Aaron Liston, M. Blumler 1987-4-26 668 -6 Colusa East Park Reservoir, 3.2 miles E of Stonyford Comment
  UCR138666  Lotus humistratus M. Brooks, Julie Evens, H. Johnson 1997-3-29 8 Colusa Brim Road, 1.6 mi east of Brim Road/ Walker Ridge Road intersection 457 Comment
  UCR206894  Lotus humistratus George K. Helmkamp, E. A. Helmkamp 2009-3-11 14363 Colusa Inner North Coast Range Foothills, along CA-20, 9.7 miles southwest of Williams, on the north side of Salt Creek 162 Comment
  HSC72772  Lotus humistratus J. Krajanowski 1981-4-4 7 Colusa Salt Canyon, N side of Salt Creek, Hwy. 20, 11 mi. WSW of Williams 143 Comment
  POM163464  Lotus humistratus Roxana S. Ferris 1926-4-23 6417 Colusa At Mountain House on the Williams-Stonyford Road. Comment
  UCD78320  Ludwigia peploides subsp. peploides B. J. Grewell; Mike Wolder 2006-7-11 06- 16 -LU Colusa Colusa National Wildlfe Refuge, west of Colusa, CA. CNWR tract T24.8. 14 Comment
  JEPS81378  Lupinus adsurgens L. R. Heckard and J. C. Hickman 1982-7-8 5989 Colusa 1/4 mi sw East Peak (Snow Mt.); , sw of East Peak 2087 Comment
  UCD82547  Lupinus albifrons Ellen Dean; G. Harrington, C. Thomsen,R. Wilmarth,Chiao-Yi Cheng 2009-5-20 5702 Colusa Walker Ridge. Along Walker Ridge just S of turn-off to picnic area near Cold Spring. 1007 Comment
  CHSC84920  Lupinus albifrons var. albifrons Ron P. Garcia 1995-4-1 2 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
  RSA590140  Lupinus albifrons var. albifrons M. A. Vincent 1996-3-30 7277 Colusa Along Bear Valley Rd. above Bear Creek, 1.4 mi. S jct Wilbur Springs Rd. 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
  CHSC62843  Lupinus albifrons var. collinus Vernon H. Oswald; Lowell Ahart 1994-3-23 6022 Colusa Little Stony Creek just W of Digger Pine Campground on Goat Mtn. Rd., S of Stonyford. 490 Comment
  JEPS22986  Lupinus albifrons var. collinus Stanton A. Cook 1959-5-30 891 Colusa n of the summit Goat Mountain; n of the summit of Goat Mountain 1828 Comment
  JEPS80459  Lupinus albifrons var. collinus Alice Q. Howard 1972-7-10 14 Colusa between Dark Hollow and Paradise Creeks; between Dark Hollow and Paradise Creeks 1402 Comment
  UCR233447  Lupinus albifrons var. collinus George K. Helmkamp, E. A. Helmkamp 2011-4-1 17121 Colusa Eastern Foothills North Coast Ranges, Antelope Valley, along Maxwell-Sites Road, 1.8 miles southeast of Sites 77 Comment
  HSC85823  Lupinus albifrons var. collinus David Munger, Tallchief Comet, Jeff Dunk 1987-4-12 77 Colusa Comment
  CDA11420  Lupinus bicolor G. F. Hrusa, K. van Katwyk 1995-4-22 12141 Colusa Inner North Coast Ranges; Side of Leesville Rd. approx. 4 m. NW of Hwy. 20. 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
  HSC72138  Lupinus bicolor J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9570 Colusa Bear Valley Rd., 2.1 mi. from its junction with Hwy. 20 366 Comment
  JEPS81297  Lupinus bicolor L. R. Heckard with J. C. Hickman 1982-7-5 5911 Colusa below Summit Springs (S side Snow Mt.) Comment
  SEINET5328111  Lupinus bicolor R. R. Halse 2002-3-21 6131 Colusa Williams; by junction 5th St. and B St. 24 Comment
  UCD64250  Lupinus bicolor Craig D. Thomsen 2000-3-31 2052 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
  UCD64419  Lupinus bicolor Craig D. Thomsen 2000-4-12 2170 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
  SEINET12164068  Lupinus densiflorus Unknown 1977-1 2 Colusa Salt Canyon, N side of Slat Crk, Hwy 20, 10 mi WSW Willilams. Wilbur Springs Quad. see comments 143 Comment
  POM20193  Lupinus densiflorus var. aureus Roxana S. Ferris 1917-4-14 584 Colusa 7 miles west of Arbuckle, along Sand Creek. Arbuckle-Ramsey Road. Comment
  SEINET10485227  Lupinus densiflorus var. aureus Clemens 1977-4-16 CLEMENS 17 Colusa Moderate population, salt creek canyon, n side of salt creek, hwy 20, 10 mi w-sw of williams. Wilbur springs quad, t.15n, r.4w, sec.32, 15 ft e central border. Open bank along roadside. 143 Comment
  UC73241  Lupinus formosus var. robustus Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  POM276455  Lupinus formosus var. robustus Lyman D. Benson 1933-4-16 4335 Colusa 5 miles south of Arbuckle, Sacramento River Watershed, Sacramento Valley. 91 Comment
  RSA0003424  Lupinus formosus var. robustus A. A. Heller, H. E. Brown 1908-5-20 s.n. Colusa Near College City. Comment
  UCD107811  Lupinus grayi Tammy S. Smith 1985-4-13 10 Colusa ca. 0.3 mi w of jct of Hwys 20 and 16, s side of Bear Creek, ca. 18.0 mi sw of Williams. 321 Comment
  UCR228655  Lupinus latifolius var. latifolius Ellen Dean, Davis Botanical Society 2008-5-31 5001 Colusa West of Hwy I-5 at Maxwell, east slope of Goat Mountain along Goat Mountain Road 1100 Comment
  RSA761032  Lupinus luteolus Barbara Ertter 1989-7-1 8616 Colusa Road to Goat Mountain Lookout 0.4 miles south of Route M-10 (Bear Creek-Fouts Spring Road) at head of South Fork Stony Creek, about 12 air mile west-southwest of Stonyford. 1372 Comment
  SBBG122950  Lupinus luteolus B. Ertter 1989-7-1 8616 Colusa rd to Goat Mtn lookout, 0.4 mi S of Bear Crk-Fouts Spring Rd, head of S Fk of Stony Crk 1371 Comment
  SD27803  Lupinus menziesii Carl B. Wolf 1928-5-7 2121 Colusa 17 miles east of [Houghs] Springs on the road to Williams 456 Comment
  RSA716572  Lupinus microcarpus D. Isle 1995-4-27 403 Colusa East Park Reservoir Rd. at N edge just at rt. angle turn, w. of cattle guard 1/4 mi. 348 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
  UCR206292  Lupinus microcarpus var. densiflorus George K. Helmkamp, E. A. Helmkamp 2009-5-20 14736 Colusa Central Inner Coast Ranges, along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 320 Comment
  SD52958  Lupinus microcarpus var. densiflorus Peter H. Raven 1962-5-31 17910 Colusa Stae Hwy 20, 2.5 miles east of Lake County line Comment
  CHSC29255  Lupinus microcarpus var. microcarpus Gary McGrath 1977-4-16 9 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 10 mi wsw of Williams. 143 Comment
  UCD57053  Lupinus microcarpus var. microcarpus Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3641 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
  UCD108845  Lupinus microcarpus var. microcarpus A. A. Heller 1919-5-10 13114 Colusa Valley west of Leesville. Comment
  RSA724143  Lupinus nanus subsp. nanus Richard R. Halse 2002-3-21 6129 Colusa Willaism; by junction of 5th Street and B Street. 24 Comment
  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
  HSC45690  Lupinus succulentus Patricia Shesgreen 1978-4-22 28 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  HSC72173  Lupinus succulentus J. P. Smith, Jane P. Nelson, Thomas W. Nelson 1978-4-2 9550 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  SEINET7096535 Image available Lupinus succulentus Richard R. Halse 2001-3-22 5947 Colusa Williams; along a vacant lot by 455 - 4th street. 39 9.52N 122 8.84W (Converted to decimal degrees). Elevation 18 m. 18 Comment
  HSC89685  Lupinus succulentus Robin Bencie, James Jones, Rich Dwerlkotte 1989-4-15 28 Colusa Bear Valley Rd. and Hwy. 20 intersection 305 Comment
  CHSC47439  Lythrum californicum Lowell Ahart 1980-6-11 2371 Colusa On the east side of River Road, where the road dips and floods during high water, about 9 1/2 miles north of Colusa. 30 Comment
  CHSC78980  Lythrum californicum Vernon H. Oswald 2000-9-29 9973 Colusa Colusa National Wildlife Refuge. 13 Comment
  RSA0014830  Lythrum californicum H. L. Mason, Verne Grant 1946-8-7 12977 Colusa 8 miles north of Colusa; Butte Sink. Comment
  CHSC86827  Lythrum hyssopifolia 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
  CHSC94454  Lythrum hyssopifolia Lowell Ahart 2006-8-9 13161 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS108741  Lythrum hyssopifolia Lowell Ahart 2006-8-9 13161 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  CHSC106708  Lythrum tribracteatum Barbara Ertter; Elizabeth Neese, laure Fujii, Dawn Espindola 1989-10-21 8870 Colusa SE end of East Park Reservoir N of Lodoga, narrow strand on shaly substrate. 365 Comment
  UCD102948  Lythrum tribracteatum H. L. Mason 1945-7-11 12645 Colusa Butte Lodge Outing Club, 3 miles above Colusa, near Butte Creek. Comment
  UCD66865  Lythrum tribracteatum Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5068 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
  JEPS117019  Lythrum tribracteatum David Gowen 2008-5-24 925 Colusa West of Sites on north side of road. 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
  JEPS108735  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
  JEPS110182  Madia elegans subsp. densifolia Lowell Ahart 2006-8-22 13229 Colusa N side and under the bridge across Stony Creek, just N of Stonyford. 347 Comment
  CHSC88539  Madia exigua B. Castro 2003-5-15 1439 Colusa Vicinity of Logan Ridge, Sulphur Gap and Lurline Creek. On steep E-facing slope above dirt rd paralleling a S-trending canyon. 176 Comment
  CHSC94677  Madia exigua Lowell Ahart 2006-6-11 12665 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
  UCR206319  Madia exigua George K. Helmkamp, E. A. Helmkamp 2009-5-20 14741 Colusa Central Inner Coast Ranges, along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 320 Comment
  JEPS119423  Madia gracilis G. K. Helmkamp, E. A. Helmkamp 2009-5-20 14753 Colusa Inner North Coast Ranges, along CA-16, 1.8 miles north of the Yolo County line Comment
  UCD67039  Madia gracilis Ellen Dean; Davis Botanical Society 2008-5-31 5019 Colusa west of I-5 at Maxwell, Goat Mountain, ridge below summit off of Goat Mountain Road. 1734 Comment
  JEPS83808  Madia gracilis L. R. Heckard with J. Hickman 1980-7-1 5283 Colusa just above trail entrance to roadless area (above Summit Springs) (Summit Springs to Frog Lake, Colusa-Lake Co. boundary, ca. 10 mi w of Stonyford); Snow Mt. 1645 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
  CHSC115622  Malacothamnus fremontii David Isle; Frank Elliott 2014-6-11 2134 Colusa Northern Sacramento Foothills: Frand and Judy Elliott Ranch, 1 mile S of Rail Canyon Rd. Jct. with Ssites-Lodoga Rd. and 1/2 mile S of Sites-Lodoga Rd. SE of Elliott home. (GPSs for Rail Canyon Rd. Jct./Sites-Lodoga Rd.) 10S-0546594E, 4356133N). Comment
  CHSC80037  Malacothamnus helleri L. P. Janeway; Joyce Lacey-Rickert 2000-6-1 6778 Colusa Vicinity of Grapevine Creek, Hayes Canyon, and Eggman Canyon. 335 Comment
  RSA32810  Malacothamnus helleri A. A. Heller 1940-6-7 s.n. Colusa Near foot of grade east of Lodogo, on Sites-Lodogo Road Comment
  UCR201715  Malacothrix Ken Osborne 2005-4-24 s.n. Colusa North Coast Range, Stony Creek, along Goat Mountain Rd. 413 Comment
  JEPS36621  Malacothrix clevelandii R. F. Hoover 1938-4-24 3212 Colusa Upper Sand Creek Comment
  CHSC79470  Malacothrix floccifera B. Castro; L. P. Janeway 2000-5-4 1135 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 249 Comment
  HSC48167  Malacothrix floccifera Thomas W. Nelson, Jane P. Nelson 1978-4-29 3931 Colusa Along Bear Valley Rd., 2 mi. from the junction with State Route 20. 366 Comment
  UCD132838  Malacothrix floccifera Beecher Crampton 1975-4-21 9164 Colusa 1.5 miles SE of Sites. Comment
  UCD163336  Malacothrix floccifera Craig D. Thomsen 2009-5-3 2807 Colusa Walker Ridge. Vicinity of Walker Ridge Rd., about 3 plus miles north of Hwy 20. 841 Comment
  UCD66682  Malacothrix floccifera Craig D. Thomsen 2000-5-11 2309 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
  RSA669479  Malva parviflora R. R. Halse 2001-3-22 5945 Colusa Williams; along a vacant lot by 455-4th Street. 18 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
  CHSC107935  Malvella leprosa B. Castro; Amy Lyons 2011-8-3 1902 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; approximately 0.7 mi southeast of Funks Reservoir and 350 ft northeast of Tehama-Colusa Canal. In grassland in patch under transmission lines ca 0.3 mi northwest of large +- alkaline marsh. 52 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
  UC18825  Malvella leprosa J. Burtt Davy May, 1898 4303 Colusa Princeton Comment
  UC573258  Malvella leprosa H. S. Yates 1936-8-14 6130 Colusa 3 mi. s. Colusa; Colusa Quad. 15 Comment
  RSA121079  Malvella leprosa H. S. Yates 1936-8-14 6130 Colusa 3 miles S. of Colusa 15 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
  SEINET7254189 Image available Marah fabacea Richard. R. Halse 2014-1 9029 Colusa Along the Sites-Logoda Road ca. 4.7 miles northeast of logoda; on the west end of Grapevine Pass 527 Comment
  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
  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
  UC102130  Marah watsonii T. S. Brandegee April 1889 Colusa Epperson's Comment
  UC903736  Marah watsonii Milo S. Baker 1947-4-6 11644 Colusa less than 1 mi e Colusa-Lake Co. boundary (along Hiway 20) 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
  UCD66689  Marah watsonii Craig D. Thomsen 2000-5-11 2319 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
  POM174574  Marah watsonii Roxana S. Ferris 1926-4-23 6593 Colusa On Grapevine Grade; Stonyford-Sites Road. Comment
  CDA36216  Marrubium vulgare G. K. Helmkamp, E. A. Helmkamp 2009-5-2 14757 Colusa Inner North Coast Ranges; Along CA-16, 1.8 miles north of the Yolo County line. Comment
  UCR225262  Marsilea vestita subsp. vestita Ellen Dean, Gordon Harrington, J. Anderson, E. Bayon, R. Willmarth 2008-6-8 5105 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20. Western edge of ranch on ridge above Cache Creek Canyon 511 Comment
  CAS-BOT-BC348045  Matricaria discoidea Roxana S. Ferris 1917-4-19 693 Colusa Sycamore Slough Comment
  UCD57865  Matricaria discoidea Gordon Harrington; Diana Hickson, Jack Alderson 2007-4-29 48 a Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. South terrace of Thompson Creek about 300 feet upstream of breached dam close to Road Kill Cafe. 395 Comment
  UCD58123  Matricaria discoidea Ellen Dean; PLB 102 Class 2007-4-29 3719 Colusa Payne Ranch. West of Hwy. 16. Ca. 2 road miles S of junction of Hwy. 20 and Hwy. 16. Through Craig Canyon. Near 'Roadkill Cafe. 414 Comment
  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
  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
  POM276582  Medicago polymorpha Lyman D. Benson 1933-4-16 4337 Colusa 5 miles south of Arbuckle, Sacramento River Watershed, Sacramento Valley. 91 Comment
  UCD107925  Medicago sativa Beecher Crampton 1963-8-5 6873 Colusa 3.5 miles south of Grimes. Comment
  CDA14215  Melica californica G. F. Hrusa 1993-5-2 10859 Colusa Frenzel Creek Research Natural Area; Mendocino National Forest. Small colony of several clumps on lower NW facing slopes in mid-canyon of Frenzel Creek, tributary of Little Stony Creek. Scattered among openings in sparse Quercus durata chaparral. Perennial. Comment
  UCD57285  Melica californica Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3656 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
  UCD82124  Melica californica Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5653 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 839 Comment
  UCR119121  Melica californica Beecher Crampton 1958-4-21 4730 Colusa Inner North Coast Ranges, 7.8 miles northwest of Rumsey, along Highway 16, just above junction of Bear Creek with Cache Creek. 381 Comment
  CHSC100245  Melica harfordii D. Isle 1988-4-13 1508 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
  JEPS81294  Melica harfordii L. R. Heckard and J. C. Hickman 1982-7-5 5908 Colusa just off creek below Summit Springs (s side of Snow Mt.); Snow Mt. 1500 Comment
  UCD57334  Melica torreyana Diane Hickson 2007-3-25 1 Colusa BLM Payne Ranch. Destinella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 560 Comment
  UCD66576  Melica torreyana Craig D. Thomsen 2001-5-24 2524 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
  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
  UCD72476  Melilotus albus Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3810 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. West side of Bear Creek, across from BLM parking lot that is located at south end of bridge. 249 Comment
  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
  RSA724950  Melilotus indicus L. Ahart 2006-8-9 13168 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 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
  UCD66910  Melilotus indicus 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. Saddle southwest of Cowboy Camp on the west side of Bear Creek. 365 Comment
  UCD169976  Melilotus officinalis G. F. Hrusa 1999-5-16 15050 Colusa Little Stony Creek. 457 Comment
  CHSC94289  Mentha canadensis Lowell Ahart 2006-8-9 13090 Colusa On the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  CHSC84983  Mentha spicata Lowell Ahart 2003-10-23 10666 Colusa Along Squaw Creek, just south of East Park Reservoir, about 1/8 mile northwest of Sites Lodoga Road, about 1 mile north of Lodoga, about 21 miles west of Maxwell. 368 Comment
  UCD117224  Mentzelia dispersa G. Ledyard Stebbins Jr. 1964-7-4 6168 Colusa Northeast side of Mt. St. John, west of Stonyford. 1524 Comment
  UCD162998  Micropus californicus Craig D. Thomsen 2000-4-28 2183 Colusa Bear Creek Botanical Management Area. Roadside shoulder of Hwy 20 (south side), about 0.3 mile west of Hwy 20/16 intersection. 345 Comment
  CAS-BOT-BC348362  Micropus californicus var. californicus Roxana S. Ferris 1917-4-14 573 Colusa Foothills 7 mi west of Arbuckle, Arbuckle - Rumsey Road Comment
  JEPS40618  Micropus californicus var. californicus W. L. Jepson 1932-5-8 16279 Colusa Lodoga Comment
  UC71655  Micropus californicus var. californicus Miss Alice King 1905-4-7 Colusa College City Comment
  UC75985  Microseris campestris Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  HSC48163  Microseris douglasii Thomas W. Nelson, Jane P. Nelson 1978-4-29 3927 Colusa Along Bear Valley Rd. ca. 2 mi. from its junction with S.R. 20 366 Comment
  CHSC115388  Microseris douglasii subsp. douglasii Lowell Ahart 2015-4-1 19996 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
  CHSC70968  Microseris douglasii subsp. douglasii Vernon Oswald; Lowell Ahart 1998-5-7 8999 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
  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
  UCD64514  Microseris douglasii subsp. douglasii Craig D. Thomsen 2000-4-12 2101 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
  CHSC89880  Microseris sylvatica B. Castro; L. Janeway 2001-5-10 1249 Colusa Vicinity of Grapevine Creek, Antelope Creek, and Pence Mtn. Near dirt road paralleling N-S-trending perennial creek, at the blue oak-grassland edge on moderately steep E-facing slope 405 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
  RSA46870  Mimulus aurantiacus var. aurantiacus Doris K. Kildale 1927-04 3244 Colusa [Unspecified] Comment
  JEPS75843  Mimulus breweri L. R. Heckard 1974-9-10 3910 Colusa ne slope West Peak; Snow Mt. 2011 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
  JEPS110093  Mimulus floribundus Lowell Ahart 2006-8-9 13151 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  JEPS80762  Mimulus floribundus L. R. Heckard and J. C. Hickman 1981-7-30 5729 Colusa crossing Trout Creek (se side of mt.); Snow Mt. 1828 Comment
  HSC85824  Mimulus guttatus David Munger, Tallchief Comet, Jeff Dunk 1987-4-12 78 Colusa Bear Valley Comment
  JEPS80223  Mimulus guttatus L. R. Heckard and J. Hickman 1980-7-3 5380 Colusa sw slope Snow Mt. (below pipe outlet from spring); Summit Springs 1554 Comment
  SBBG128807  Mimulus guttatus L. Ahart 2013-5-1 18688 Colusa small drainage, N of the wash and St Hwy 20, just E of Lake County Line, 12.2 mi (air) ENE of Clear Lake (town), 17.1 mi (air) W of Williams 566 Comment
  UC1049541  Mimulus kelloggii Rimo Bacigalupi 1950-4-16 3105 Colusa vicinity Colusa-Glenn County line (ridge above Red Bridge Camp and the confluence of the North amd Middle Forks of Stony Creek); Inner North Coast Ranges, Mendocino National Forest 579 Comment
  JEPS108815  Mimulus layneae Lowell Ahart 2006-6-11 12664 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
  JEPS60202  Mimulus layneae L. R. Heckard 1969-5-29 2238 Colusa about 6 1/2 air mi se Stonyford (along Trough Spring Ridge road, 0.2 mi n of its junction with Crackerbox Ridge road) 1127 Comment
  JEPS104385  Mimulus microphyllus Lowell Ahart 2003-7-14 10383 Colusa Along a stream, field on the south side of Highway 20, ca 2 mi sw of the intersection of Highway 20 and Bear Valley Rd, ca 21 mi (by road) sw of Williams. 520 Comment
  JEPS108907  Mimulus pilosus Lowell Ahart 2006-8-9 13105 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford 422 Comment
  RSA718048  Mimulus pilosus L. Ahart 2006-8-9 13105 Colusa On the south side of Stony Creek, at Mine Camp, about 3.5 miles (air) west of stonyford. 422 Comment
  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
  UCD81729  Mimulus rattanii Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5731 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
  JEPS10517  Mimulus tricolor Ruth Johnson 1915-4-6 Colusa College City Comment
  HSC31564  Minuartia douglasii Teresa Prendusi 1974-5-4 49 Colusa Beyond Clyde Mine 1/8 mi. 854 Comment
  UCD57309  Minuartia douglasii Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3680 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
  HSC47702  Minuartia douglasii J. P. Smith, J. O. Sawyer 1978-4-29 9788 Colusa Just W of Walker Ridge Rd. intersection with Bartlett Springs Rd. Comment
  POM256528  Minuartia douglasii Annetta Carter 1938-5-7 1377 Colusa Comanche Hills, 4 miles N of Rumsey, Inner North Coast Range. 259 Comment
  JEPS61324  Mirabilis greenei W. L. Jepson 1932-5-8 16299 Colusa n of Stonyford (w Colusa County) 365 Comment
  CAS-BOT-BC435026  Mollugo verticillata Edward Lee 1934-8-9 1010 Colusa Four miles north of Willows, Sacramento Valley Comment
  IRVC29625  Monardella Mark A. Elvin, Mark S. Brunell, David Isle 2006-8-3 5021 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
  JEPS80272  Monardella odoratissima subsp. glauca L. R. Heckard and J. Hickman 1980-9-16 5455 Colusa East of West Peak (first meadow along trail from Frog Pond in cirque area); Snow Mt. 1981 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
  CHSC83196  Monardella villosa D. Sanchez-Mata 1996-6-27 Colusa Williams. Blue Ridge. In Bear Creek. Comment
  SEINET9336472  Monardella villosa Mark Elvin, Isle, David; Brunell, Mark 2006-8-3 4991 Colusa Southern Northern Inner Coast Ranges Comment
  UCD80833  Monardella villosa Ellen Dean; G. Harrington, J. Alderson, M. Bibbo, B. Rice 2009-3-25 5290 Colusa BLM Bear Creek (Payne) Ranch, lands to the SW of the jct of Hwys 16 and 20. Canyon to the north of Brophy Canyon, ca. 100 ft from entrance at Bear Creek. 233 Comment
  UCR44933  Monardella villosa L. F. LaPre 1986-5-30 s.n. Colusa Stony Creek Rd, 2.2 mi. west of Mendocino National Forest boundary, NE of Clear Lake 678 Comment
  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
  UCD22648  Monardella villosa subsp. sheltonii Laura F. Galloway 1988-5-1 6 Colusa Leesville Road, 11.9 miles north of SR20. 487 Comment
  CAS-BOT-BC214163  Monardella villosa subsp. villosa Mark A. Elvin; David Isle; Mark S. Brunell 2006-8-3 4991 Colusa Mendocino Nat. Forest, E face of Snow Mtn., Stony Creek along M10, Southern Northern Inner Coast Ranges 609 Comment
  UCD82537  Monardella villosa subsp. villosa Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5690 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 817 Comment
  UCR261722  Monardella villosa subsp. villosa Ann Howald 2003-5-30 2356 A 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
  CAS-BOT-BC349576  Monolopia major James Jokerst 1985-4-5 2208 Colusa Near Coyote Peak 456 Comment
  JEPS15267  Monolopia major Rimo Bacigalupi with G. L. Stebbins, Calvin McMillan, Peter Kamb, and S. Galen Smith 1950-4-16 3118 Colusa base grade (Bartlett Springs road) (western edge of valley); inner edge of easternmost North Coast Ranges, Bear Valley 426 Comment
  JEPS35229  Monolopia major W. L. Jepson 1932-5-7 16254 Colusa valley above Venado 274 Comment
  SEINET8729067 Image available Montia spathulata Helen K. Sharsmith 1953-1 4281 Colusa Near Trough Springs on Trough Springs Ridge; Mendocino National Forest. 975 Comment
  CHSC89832  Muhlenbergia filiformis B. Castro; L. P. Janeway, S. Innecken 2001-3-28 1213 Colusa Vicinity of Sites in rolling hills near Sulphur Gap, among unnamed tributaries to Lurline Creek, in heavily grazed annual grassland E of blue oak savanna. 91 Comment
  CHSC89830  Muilla maritima B. Castro; S. Innecken 2001-3-20 1216 Colusa Vicinity of Maxwell, Golden Gate in Logan Ridge, Funks Reservoir, and the Glenn-Colusa canal. 39 Comment
  CAS-BOT-BC83278  Myosurus minimus A. A. Heller 1921-4-10 13545 Colusa Near Colusa. Comment
  CAS-BOT-BC83282  Myosurus minimus James Jokerst 1986-5-6 2299 Colusa Near Lurline Creek. 41 Comment
  UCD18836  Myosurus minimus Vernal Pool Team 2001; Carol Witham and Jennifer Buck 2001-4-30 143 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
  CAS-BOT-BC83280  Myosurus minimus Alice Eastwood 1922-4-24 11188 Colusa Road between Princeton and Norman. Colusa/Glenn county line. Comment
  CAS-BOT-BC456163  Najas guadalupensis Herbert L. Mason; Verne Grant 1946-8-15 13008 Colusa Two miles west of Colusa on Williams highway by bridge Comment
  CAS-BOT-BC259753  Nassella cernua Roxana S. Ferris 1926-4-23 6399 Colusa Near Mountain House on Williams - Stonyford Road Comment
  CHSC85970  Nassella pulchra Jenny Marr; Caroline Warren 1998-5-4 Colusa Vicinity of Sites, Stone Corral Creek, and Antelope Valley. 106 Comment
  UCD81229  Navarretia Ellen Dean; K. Mawdsley, B. Rice, G. Harrington, and J. Alderson 2009-5-6 5566 Colusa Payne Ranch, lands to the SW of the jct. of Hwys. 16 and 20. Destanella Flat area on the S side of Hwy. 20. West side of Destinella Flat. 446 Comment
  UCD66983  Navarretia atractyloides Ellen Dean; Davis Botanical Society 2008-5-31 5057 Colusa west of I-5 at Maxwell, vicinity of Fouts Springs, west of Stoneyford, Grindstone Ranger District Mill Creek campground parking area on S side of Fouts Springs Road. 507 Comment
  JEPS70256  Navarretia cotulifolia W. L. Jepson 1920-5-23 8965 Colusa near Leesville (foot of Bartlett Grade, w side of Bear Valley); Bear Valley, Bartlett Grade 426 Comment
  UC856855  Navarretia cotulifolia A. A. Heller 1916-6-9 12388 Colusa about 2 mi w Leesville; Coast Range 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
  CHSC79543  Navarretia heterandra B. Castro; L. P. Janeway 2000-5-1 1104 Colusa Vicinity of Sites, hills S of the Sites-Lodoga Rd, and Grapevine Creek. 204 Comment
  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
  UC908635  Navarretia jepsonii Herbert L. Mason 1946-5-31 12810 a Colusa near summit of Leesville Grade (drainage of n fork of Cache Creek); Cache Creek 548 Comment
  UCD57562  Navarretia jepsonii Stephanie Castle; 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. 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, adjacent to Craig Creek. 304 Comment
  UCD61473  Navarretia jepsonii Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3919 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Just west of parking lot on west side of Bear Creek. 312 Comment
  CHSC94469  Navarretia leptalea subsp. leptalea Lowell Ahart 2006-8-9 13128 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  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
  UCR225393  Navarretia nigelliformis Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5082 Colusa BLM Payne Ranch, lands to the southwest of the junction 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 429 Comment
  CHSC112918  Navarretia nigelliformis subsp. nigelliformis B. Castro; Robin Carter, Amy Lyons 2010-5-13 1807 Colusa Vicinity of Golden Gate in Logan Ridge, Road 69 and the Tehama-colusa canal, in disturbed, grazed annual grassland. 121 Comment
  CAS-BOT-BC230054  Navarretia pubescens Ellen Dean; G. Harrington; C. Thomsen; Chiao-Yi Cheng; R. Wilmarth 2009-5-20 5646 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road 839 Comment
  UC584174  Navarretia pubescens J. Clausen 1935-5-20 1014 Colusa 18 mi w Williams (on Bartlett Springs road) Comment
  CHSC89877  Navarretia tagetina B. Castro; L. Janeway, S. Innecken 2001-5-9 1246 Colusa Vicinity of Grapevine Creek, Antelope Creek, and Pence Mtn. Along dirt road paralleling N-S-trending perennial creek. 365 Comment
  UC1618098  Navarretia viscidula Donald G. Nelson 1940-6-9 Colusa Stoneyford Comment
  RSA537450  Nemacladus capillaris Barbara Ertter 1989-7-1 8599 Colusa Road to Goat Mt Lookout 2.2 miles S of Rt M-10 (Bear Creek-Fouts Spring Rd) at head of S Fk Stony Creek, ca 12 airmiles WSW of Stonyford. 1500 Comment
  UCD63119  Nemacladus montanus Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4949 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20. 405 Comment
  CHSC77936  Nemophila heterophylla Beth Hendrickson; Jean Witzman 1999-4-21 Colusa Vicinity of Antelope Valley and Sites. 137 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
  SEINET7856709  Nemophila heterophylla R. R. Halse 2013-3-26 8738 Colusa Along the Leesville Road ca. 5.6 miles northwest of its junction with State Hwy. 20, west of Williams. 157 Comment
  UCD66587  Nemophila heterophylla Craig D. Thomsen 2000-4-12 2158 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UCD66598  Nemophila heterophylla Craig D. Thomsen 2000-4-28 2256 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UCR206395  Nemophila heterophylla George K. Helmkamp, E. A. Helmkamp 2009-3-11 14372 Colusa Inner North Coast Range Foothills, along CA-20, 14.3 miles southwest of Williams 375 Comment
  CHSC36121  Nemophila menziesii P. Reynolds 1980-4-12 12 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
  UCD120236  Nemophila menziesii Gene R. Williams 1961-3-29 32 Colusa South of Bear Valley; 3 miles north of junction of State Highways 16 and 20. Comment
  CHSC70890  Nemophila menziesii var. menziesii Vernon Oswald; Lowell Ahart 1998-4-21 8949 Colusa Rd. 401 1.8 mi north of Grapevine Pass on the Sites-Lodoga Rd. 472 Comment
  UCD66962  Nemophila parviflora Ellen Dean; Davis Botanical Society 2008-5-31 5006 Colusa west of I-5 at Maxwell, east slope of Goat Mountain, along Goat Mountain Road, Cedar Grove Campground. 1311 Comment
  CHSC43374  Nicotiana glauca Lowell Ahart 1976-2-14 1006 Colusa Along a small stream, about 2 miles west of Sites. 182 Comment
  JEPS87759  Nicotiana glauca Vernon H. Oswald and Lowell Ahart 1994-3-23 6024 Colusa 1.8 mi w Stonyford-Lodoga Rd. (Goat Mtn Rd, s of Stonyford, between the road and Little Stony Creek) 487 Comment
  JEPS87760  Nicotiana glauca Vernon H. Oswald and Lowell Ahart 1994-3-23 6024 Colusa 1.8 mi w Stonyford-Lodoga Rd. (Goat Mtn Rd, s of Stonyford, between the road and Little Stony Creek) 487 Comment
  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
  UC199530  Nicotiana quadrivalvis H. M. Hall 1917-4-29 10286 Colusa 5 mi n Colusa (Sacramento River banks); Sacramento River Comment
  UC34994  Nicotiana quadrivalvis J. Burtt Davy May 1898 4304 Colusa near Princetown Comment
  CAS-BOT-BC400054  Nuphar polysepala F. P. Cronemiller 1924-6-26 892 Colusa Upper Letts Swamp 1371 Comment
  UC71628  Nuttallanthus texanus Miss Alice King 1905-1 Colusa College City Comment
  CAS-BOT-BC227679  Oemleria cerasiformis Craig Thomsen 2008-6-12 2762 Colusa Walker Ridge, vicinity of Elgin Mine. Lucientes Property 655 Comment
  RSA0076585  Orobanche fasciculata Frank W. Gould 1938-4-22 283 Colusa At head of Capay Valley, west of Arbuckle. Comment
  RSA402037A  Orthocarpus lithospermoides Jens Clausen 1935-5-20 1018 Colusa Ca. 27 mi W of Williams after having passed the Wilbur Springs road. Along Bear Creek. Comment
  RSA516500  Orthocarpus lithospermoides var. bicolor W. L. Jepson 1938-6-9 18964 Colusa Mts. between Indian Valley and Bear Valley. Btw. Lake Co. and Colusa Co. Comment
  SEINET12270141  Orthocarpus lithospermoides var. bicolor A. Carter, Kellogg, L. 1953-1 3239 Colusa road to Leesville, 6 mi N of Wilbur Springs Junction 400 Comment
  JEPS80775  Osmorhiza berteroi L. R. Heckard and J. C. Hickman 1981-7-30 5748 Colusa Trout Creek trail Snow Mt. (se slope of mt.) 1645 Comment
  JEPS73443  Osmorhiza occidentalis L. R. Heckard 1972-7-8 3038 Colusa near summit ridge se West Peak (Lake-Colusa Co. boundary); Snow Mt. 2072 Comment
  CAS-BOT-BC316836  Packera clevelandii Dennis E. Breedlove 1963-5-30 5182 Colusa 17 miles E of Bartlett Springs Comment
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Apr 25 2021
  UCD110512  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
  UCD133496  Packera clevelandii D. Sanchez-Mata 1998-7-10 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain Road between Lodoga and Red Rock Cabin. 420 Comment
  UCD64029  Packera clevelandii Craig D. Thomsen 2000-5-11 2286 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, Colusa Co. milepost 2.63. 304 Comment
  UCD163327  Packera eurycephala Craig D. Thomsen 2009-5-3 2792 Colusa Walker Ridge. Vicinity of Walker Ridge Rd., 0.25 miles north of Hwy 20. Comment
  CAS-BOT-BC231236  Packera eurycephala var. eurycephala Roxana Stinchfield Ferris 1926-4-23 6454 Colusa Stonyford. Comment
  JEPS118690  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
  JEPS74815  Packera eurycephala var. eurycephala L. R. Heckard, T. I. Chuang, and R. Bacigalupi 1975-5-7 4024 Colusa sw of Leesville (just sw of site of old Kowalski ranch( below upper dam road)); Upper Indian Valley 396 Comment
  UC1299444  Packera greenei Freed W. Hoffman 1947-6-19 1670 Colusa Cooks Springs, w Colusa County North Coast Ranges Comment
  UCD66540  Packera greenei Craig D. Thomsen 2001-5-24 2518 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
  HSC46738  Packera greenei William J. Ferlatte 1978-6-13 1908 Colusa Colusa-Lake Co. line. On Mendocino National Forest Rd. 16N06 about 0.5 mi. SE of Kanaka Glade 1050 Comment
  CAS-BOT-BC253663  Panicum capillare Roxana Stinchfield 1916-7-10 479 Colusa Davis Tule near Sycamore Slough Comment
  UCD32923  Panicum capillare subsp. hillmanii Beecher Crampton 1965-7-8 7446 Colusa Colusa County, 1 mile south of Sycamore. Comment
  UC1101582  Panicum dichotomiflorum subsp. dichotomiflorum Herbert L. Mason 1945-9-19 12720 Colusa 1 mi n Colusa (below causeway over Butte Sink spillway, e bank Sacramento River); e bank Sacramento River Comment
  CAS-BOT-BC253936  Parapholis incurva A. A. Beetle 1942-5-21 3271 Colusa 12 miles N of Williams Comment
  UCD88609  Parapholis incurva Beecher Crampton 1953-4-29 1143 Colusa 2 miles east of Maxwell. Comment
  UCR119180  Parapholis incurva Beecher Crampton 1953-4-29 1143 Colusa Sacramento Valley, 2 miles east of Maxwell 91 Comment
  POM166124  Parietaria pensylvanica Roxana Stinchfield 1916-7-8 378 Colusa Stinchfield Ranch, along Sycamore Slough Comment
  UCR115039  Parnassia californica G. Fred Hrusa 1994-11-7 11993 Colusa Banks of Little Stony Creek, c. 2.5 mi above Stonyford-Lodoga Rd. on Goat Mtn Road. 440 Comment
  JEPS110214  Paspalum distichum Lowell Ahart 2006-9-26 13352 Colusa Along the deep ditch, south side of the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell 24 Comment
  CDA11413  Pectocarya pusilla G. F. Hrusa, K. van Katwyk 1995-4-22 12134 Colusa Inner North Coast Ranges; E base of ridge immed. E of Bear Valley, along Leesville Road. Comment
  CHSC77918  Pectocarya pusilla Jean Witzman; Beth Hendrickson 1999-4-7 Colusa Vicinity of Antelope Valley, Funks Creek, and Logan Ridge. 121 Comment
  CHSC86879  Pectocarya pusilla B. Castro 2003-4-1 1411 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 through area of cutover blue oak woodland. 280 Comment
  JEPS87668  Pectocarya pusilla Vernon H. Oswald and Lowell Ahart 1994-4-6 6071 Colusa s. Stonyford (Goat Mtn. Road 0.8 mi s. of Sullivan Creek Bridge, sw of Digger Pine Flat) 487 Comment
  UC1177895  Pectocarya pusilla Peter M. Ray 1950-4-16 1738 Colusa 2 mi s Lodoga (on rd to Leesville) 381 Comment
  JEPS87762  Pedicularis densiflora Vernon H. Oswald and Lowell Ahart 1994-3-23 6012 Colusa s of Stonyford (Frenzel Creek Research Natural Area, on s side of Little Stony Creek, along e side of Frenzel Creek); Frenzel Creek Research Natural Area, Little Stony Creek 518 Comment
  RSA0060516  Pedicularis densiflora Richard R. Halse 2014-3-25 9035 Colusa Along the Bear Valley Road ca. 1.8 miles west northwest of its junction with State Hwy. 20. 378 Comment
  UCD110808  Pedicularis densiflora Christopher Mallek 2008-1 s.n. Colusa Pacific Ridge. Border of Colusa and Lake Counties. 1101 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
  RSA401941B  Pedicularis densiflora Terry Roth 1979-4-14 9 Colusa [No location data on label] 1067 Comment
  UCD80837  Pellaea andromedifolia Ellen Dean; G. Harrington, J. Alderson, M. Bibbo, B. Rice 2009-3-25 5294 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
  HSC94208  Pellaea andromedifolia D. Haskamp, E. Sonnenblick, M. Taft 1995-4-1 22 Colusa On Brim Rd. 1.6 mi. W of Jct. with Bear Valley Rd. 488 Comment
  JEPS86609  Pellaea brachyptera L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-19 6713 Colusa 0.5 mi. n.e. Summit Springs (s.w. flank of Snow Mt.); Colusa-Lake Co. Line, Snow Mt. 1650 Comment
  UCSB6183  Penstemon heterophyllus Keator, Glenn 1958-6-17 Colusa Near Bartlett Springs Comment
  UCD67126  Penstemon heterophyllus var. azureus Ellen Dean; Davis Botanical Society 2008-5-31 5056 Colusa west of I-5 at Maxwell, vicinity of Fouts Springs, west of Stoneyford, Grindstone Ranger District Mill Creek campground parking area on S side of Fouts Springs Road. 507 Comment
  UC614476  Penstemon heterophyllus var. purdyi L. Constance 1938-4-22 2148 Colusa Lower Lake-Williams Road 11 mi ne Lake-Colusa Line (above Salt Creek); Inner North Coast RAnges, above Salt Creek 152 Comment
  NY601742  Penstemon heterophyllus var. purdyi J. C. Clausen 1935-5-20 1015 Colusa 18 miles west of Williams on the Bartlett Springs road. Comment
  CHSC42651  Perideridia kelloggii Vernon Oswald 1986-6-30 2175 Colusa Letts Lake Rd. (17N02) 0.6 mi se of M10. 1219 Comment
  UCD127855  Perideridia kelloggii K. Esau; D. Hartmann 1941-7-17 s.n. Colusa Between Williams and Clear Lake, on U.S. #20. Comment
  JEPS73489  Perideridia oregana L. R. Heckard 1972-7-9 3101 Colusa East Peak Snow Mt. (scree slope on se slope) 2011 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
  CHSC61435  Persicaria punctata Vernon H. Oswald 1993-8-16 5807 Colusa Sacramento National Wildlife Refuge located ca. 7 mi S of Willows, W1/4 of Tract 44, near the S boundary of the refuge. Growing in shallow water on the N edge of Hunters Creek. 24 Comment
  SBBG119882  Persicaria punctata L. Ahart 2006-8-9 13133 Colusa N side and under the bridge across Stony Crk, just N of Stonyford 347 Comment
  POM65807  Phacelia ciliata Roxana S. Ferris 1917-4-12 536 Colusa 4 miles east of Williams. Comment
  UC1228357  Phacelia corymbosa L. R. Heckard and G. T. Robbins 1956-7-24 816 Colusa about 1/2 mi s summit; Snow Mountain 2042 Comment
  CHSC108152  Phacelia distans David Isle 2008-4-9 1934 Colusa Sacramento River Watershed. Reese Place Duck Club (4498 2 Mile Rd); ~ 4 mi. NE of Maxwell. 30 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
  CHSC32215  Phacelia egena James Jokerst 1980-8-6 1058 Colusa Near Snow Mountain (West). Comment
  JEPS80874  Phacelia heterophylla subsp. virgata L. R. Heckard and J. C. Hickman 1980-7-3 5373 A Colusa near Summit Springs (sw slope); Snow Mt. 1554 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
  RSA799179  Phacelia imbricata subsp. imbricata George K. Helmkamp, E. A. Helmkamp 2011-4-1 17132 Colusa Eastern foothills North Coast Ranges: Antelope Valley, along Maxwell-Sites Road, 0.4 mi southeast of Sites. 93 Comment
  UC901839  Phacelia imbricata subsp. imbricata L. Constance, R. Bacigalupi, C. R. Bell, and A. H. Holmgren 1950-4-26 3322 Colusa ridge between Bear Valley and Indian Valley (near Colusa-Lake Co. line) 609 Comment
  UCR233444  Phacelia imbricata subsp. imbricata George K. Helmkamp, E. A. Helmkamp 2011-4-1 17132 Colusa Eastern Foothills North Coast Ranges, Antelope Valley, along Maxwell-Sites Road, 0.4 miles southeast of Sites 93 Comment
  CAS-BOT-BC134039  Phacelia tanacetifolia Roxana S. Ferris 1926-4-23 6407 Colusa on grade beyond the Mountain House of the Williams-Stonyford Road Comment
  UCD164156  Phacelia tanacetifolia Craig Thomsen 2008-4-7 2726 Colusa Bear Creek Canyon, along Bear Valley Rd. about 0.75 mile north of junction with Hwy 20. Comment
  HSC45512  Phacelia tanacetifolia M. Alcasas 1978-4-22 48 Colusa Bear Valley Rd., 2.3 mi. from Hwy. 20 419 Comment
  POM289798  Phacelia tanacetifolia Lyman Benson 1935-3-27 6338 Colusa 2 mi W of Williams. Inner N Coast mtn range, Sacramento River watershed. 122 Comment
  CHSC107954  Phalaris aquatica B. Castro; T. Boullion 2011-4-20 1832 Colusa Sacramento Valley. Extreme W edge of Sacramento Valley; ca 5 air mi NW of Maxwell, 0.8 mi SE of Funks Reservoir and 800 ft east of Tehama-Colusa Canal. Ca 0.25 mi NW of large +- saline/alkaline wetland/marsh, just south of tilled grain field. 52 Comment
  UCR225399  Phalaris aquatica Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5100 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20. Western part of ranch along ridge trail at Cache Creek Canyon, just south of junction with trail that leads east to Brophy Canyon and Thompson Creek 488 Comment
  CAS-BOT-BC259026  Phalaris lemmonii Alice Eastwood 1922-4-24 11195 Colusa Road between Princeton & Norman Comment
  CAS-BOT-BC265958  Phalaris minor Roxana S. Ferris 1926-4-21 6282 Colusa 3 miles west of Colusa Comment
  SEINET10657421  Phalaris minor Roxana S. Ferris 1917-4-12 Ferris 508 Colusa 4 mi. east of Williams; Alkali Plains Comment
  CHSC85974  Phalaris paradoxa Jenny Marr; Heidi West, Joyce Lacey-Rickert, Caroline Warren 1998-5-8 Colusa Vicinity of Sites and Antelope Valley. 121 Comment
  UCD63034  Phalaris paradoxa Ellen Dean; Marjorie Phan and Gerald Dickinson 2008-4-27 4880 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Across Bear Creek from Cowboy Camp. 323 Comment
  JEPS71082  Phlox gracilis W. L. Jepson 1932-5-8 16276 Colusa Lodoga, w Colusa Co Lodoga 457 Comment
  JEPS71108  Phlox gracilis Alice King May 1906 Colusa College City 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
  CHSC90854  Phoradendron densum D. Isle 1996-11-26 188 Colusa Mendocino National Forest--North Coast Ranges. Bear Creek Watershed. 1.1 mi. so. of jct. Covelady 4x4 Rd. with 24N02, near Kanaka Glade, Pacific Ridge. 1018 Comment
  SD257382  Phoradendron macrophyllum George K. Helmkamp, Elizabeth Helmkamp 2014-1-4 22508 Colusa Sacramento Valley: along CA-20 at the juncton with Alameda Court, 0.2 mile west of the Sacramento River crossing at Meridian (Meridian 7.5'Q) 20 Comment
  JEPS80242  Phoradendron villosum L. R. Heckard and J. Hickman 1980-7-3 5403 Colusa near Summit Springs (Snow Mt.); Snow Mt. Comment
  CHSC88597  Phragmites australis L. P. Janeway; B. Castro 2001-6-3 7098 Colusa Inner North Coast Ranges. Spring at Grapevine Flat, on top of Walker Ridge about 0.8 km east of Baldy Mountain. 884 Comment
  CHSC60924  Phyla nodiflora var. rosea Vernon H. Oswald 1993-6-23 5571 Colusa Sacramento National Wildlife Refuge. Refuge located ca. 7 mi S of Willows, near the S side of Cell 2, Pool 10. 21 Comment
  RSA140862  Physalis lancifolia John H. Thomas 1960-8-30 8866 Colusa About 5 miles northwest of College City along road to Sycamore. Comment
  UCD80817  Pickeringia montana Ellen Dean, G. Harrington; K. Mawdsley, C. Thomsen, G. Walden, E. McDermott 2009-3-18 5273 Colusa BLM Bear Creek (Payne) Ranch, lands to the SW of the jct of Hwys 20 and 16. E-facing slope above Eula Canyon. Between the headwater areas of Craig and Eula Canyons. 528 Comment
  UC1101610  Pilularia americana G. Thomas Robbins and S. Galen Smith 1950-4-15 1905 Colusa Bear Valley Comment
  CHSC105196  Pinus attenuata B. Castro; L. P. Janeway 1999-7-5 1010 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 Lovelady Ridge rd ca 0.35 mi N of its jcn with USFS Rd 16N06, near top of Pacific Ridge. 1097 Comment
  UCD165933  Piperia leptopetala Ellen Dean; with Tom Starbuck 2016-4-24 8844 Colusa BLM Bear Creek Ranch (formerly Payne Ranch). Lands to the southwest of the intersection of Highway 16 and Highway 20. On north-facing slope of knoll that is just south of corral area (corral at junction of Highways 16 and 20). 393 Comment
  CHSC94297  Piptatherum miliaceum Lowell Ahart 2006-8-9 13106 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  UCD84557  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
  CHSC77920  Plagiobothrys canescens Beth Hendrickson; Jean Witzman 1999-4-21 Colusa Vicinity of Antelope Valley and Sites. 137 Comment
  SBBG126070  Plagiobothrys canescens G. K. Helmkamp with E. A. Helmkamp 2009-5-20 14750 Colusa St Hwy 16 at "Cowboy Camp" 1.0 mi S of jct with St Hwy 20, adjacent to Bear Crk 332 Comment
  SD237378  Plagiobothrys canescens G. K. Helmkamp, E. A. Helmkamp 2009-5-20 14750 Colusa Inner North Coast Ranges: along CA-16 at Cowboy Cammp 1.0 mile south of the junction with CA-20, adjacent to Bear Creek (Glascock Mountain 7.5'Q) 331 Comment
  SFV3146  Plagiobothrys canescens A. Ongun 1961-4-16 37 Colusa Bear Valley, 8 miles north of State Highway 20. Just south of wooden bridge. Comment
  UCR261659  Plagiobothrys distantiflorus Ann Howald 2003-3-25 2286 Colusa Inner North Coast Ranges, Indian Valley, west side of East Park Reservoir, c. 2.1 miles southeast of Stonyford, near diversion canal inflow to reservoir 369 Comment
  JEPS81273  Plagiobothrys nothofulvus L. R. Heckard and J. C. Hickman 1982-7-5 5883 Colusa s side Snow Mt.; , Summit Springs 1500 Comment
  SEINET3152906  Plagiobothrys nothofulvus M. A. King 1905-4-7 D Colusa College city Comment
  UCD120933  Plagiobothrys nothofulvus E. Witharm 1998-4-17 5 Colusa Bear Vly., Leesville-Lodoga Rd., 2 road miles NE from Bear Vly Rd. -- Leesville-Lodoga Rd. junction. Comment
  CHSC29711  Plagiobothrys scriptus K. R. Stern 1980-4-3 6622 Colusa North central portion of Delevan National Wildlife Refuge. 48 Comment
  JEPS124210  Plagiobothrys stipitatus Lowell Ahart 2015-4-10 20006 Colusa About 1/2 mile east of Leesville, about 12 miles (air) northwest of Williams. Comment
  CDA32833  Plagiobothrys stipitatus P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  SD27804  Plagiobothrys stipitatus var. micranthus Carl B. Wolf 1928-5-8 2123 Colusa 3.0 miles south of Arbuckle. 42 Comment
  SD28155  Plagiobothrys stipitatus var. micranthus Carl B. Wolf 1928-5-8 2124 Colusa 3.0 miles south of Arbuckle 42 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
  UCD63009  Plagiobothrys stipitatus var. stipitatus Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4662 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Near corral on west side of Bear Creek just south of Hwy 20. 319 Comment
  CHSC62922  Plagiobothrys tenellus Vernon H. Oswald; Lowell Ahart 1994-4-6 6069 Colusa Goat Mtn. Rd. at Sullivan Creek, 1.2 mi SW of Digger Pine Flat, S of Stonyford. On the slopes bordering Sullivan Creek. 469 Comment
  CAS-BOT-BC60834  Planodes virginica Doris K. Kildale 1928-5-8 5017 Colusa 3 miles south of Arbuckle. Comment
  CHSC107958  Plantago coronopus B. Castro; T. Boullion 2011-4-20 1837 Colusa Sacramento Valley. Extreme W edge of Sacramento Valley; ca 5 air mi NW of Maxwell, 0.8 mi SE of Funks Reservoir and 650 ft northeast of Tehama-Colusa Canal. Off northwest corner of large +- saline/alkaline wetland/marsh, scattered in marsh edges, vernally moist flats, vernal pools and edge of large bald patch of bare whitish soil. 49 Comment
  CHSC89837  Plantago coronopus B. Castro; L. Janeway, S. Innecken 2001-5-9 1252 Colusa Vicinity of Grapevine Creek, Antelope Creek, and Andys Canyon. Near dirt road paralleling N-S-trending perennial creek. 367 Comment
  JEPS20849  Plantago coronopus B. Crampton 1953-4-29 1144 Colusa about 2 mi e Maxwell Comment
  UCD36224  Plantago coronopus Beecher Crampton 1953-4-29 1144 Colusa Colusa County, 2 miles east of Maxwell. Comment
  UCD58124  Plantago coronopus Ellen Dean; PLB 102 Class 2007-4-29 3720 Colusa Payne Ranch. West of Hwy. 16. Ca. 2 road miles S of junction of Hwy. 20 and Hwy. 16. Through Craig Canyon. Near 'Roadkill Cafe. 414 Comment
  CHSC112257  Plantago erecta Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18632 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
  POM61338  Plantago erecta Roxana S. Ferris 1917-4-12 496 Colusa 4 miles east of Williams. Comment
  RSA424754  Plantago erecta Aaron Liston, M. Blumler 1987-4-26 668 -3 Colusa East Park Reservoir, 3.2 miles E of Stonyford Comment
  UC76647  Plantago erecta Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  UCD124494  Plantago erecta J. M. Tucker 1960-4-3 3582 Colusa north side of State Highway 20, ca. 100 yards east of Lake-Colusa county line. Comment
  UCD56910  Plantago erecta Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3513 Colusa BLM Payne Ranch. In Craig Canyon. Southwest of intersection of Hwy. 16 and Hwy. 20. 326 Comment
  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
  UCD64289  Plantago erecta Craig D. Thomsen 2000-3-31 2122 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
  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
  RSA388847  Plantago erecta subsp. erecta Susan Dakuzaku 1975-4-20 28 Colusa Bear Valley Road, 9.5 miles north of State Highway 20. 404 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
  CHSC23473  Platystemon californicus S. R. Poe 1974-3-30 29 Colusa In fields adjacent to highway 20, 22.5 mi. w of williams. Comment
  CHSC59996  Platystemon californicus Robert Robichaux 1975-4-20 43 Colusa Wilbur Springs Road, ca. 6 miles southwest of Barrel Springs. 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
  UC125224  Platystemon californicus Katharine Brandegee Apr 1889 Colusa Colusa Junction Comment
  UCD96031  Platystemon californicus Beecher Crampton 1975-4-21 9170 Colusa 3.5 miles northwest of Lodoga (by road.) 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
  HSC86821  Platystemon californicus Dana J. Lenarz 1982-3-27 3 Colusa .5 km W of junction of Hwy. 20 and Hwy. 16, S side of Bear Creek, 29 km SW of Williams 322 Comment
  SD147978  Platystemon californicus L. Coats 1983-4-24 15 Colusa Along Bear Valley Road, 4.3 miles south of Bartlett Springs Road; next to a cattle pastuere along the roadside. Comment
  SEINET12091618  Platystemon californicus C. M. Corda 1982-1 4 Colusa Ca 0.3 mi W of jct Hwys 20 and 16, S side Bear Cr., ca 100 yds from S side Hwy 20, ca 18 mi SW of 322 Comment
  SFV8387  Platystemon californicus L. E. Miller 1973-4-15 12 Colusa Middle of Bear Valley, north of State Highway 20. Roadside. Comment
  UC1051694  Platystemon californicus Helen K. Sharsmith 1953-6-18 4257 Colusa above Mill Creek near Fouts Spring (Mendocino National Forest); Inner North Coast Ranges, , Mill Cr 609 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
  UCD68862  Platystemon californicus G. Robinson 1984-4-21 11 Colusa Bear Valley, California, 30 m. West of Wilbur Springs Road, 3.2 miles North of Highway 20. In valley grasslands - pasture forbs plant association, dominated by composites, on hard, black clay soil, in full sunlight, common in area. Solitary, upright plants. Flowers, yellow-white, 'cream cup. 390 Comment
  UCD82340  Platystemon californicus Robin McMaster 1973-4-15 326 Colusa Bear Valley. Comment
  POM19059  Platystemon californicus var. californicus Lyman Benson 1935-3-27 6334 Colusa 2 mi W of Williams. Inner N Coast mtn range, Sacramento River watershed. 122 Comment
  RSA590191  Platystemon californicus var. californicus Michael A. Vincent, Robert Rhode 1996-3-30 7293 Colusa Along Bear Valley Road, 4.6 miles N of junction Wilbur Springs Road Comment
  CDA11417  Plectritis ciliosa G. F. Hrusa, K. van Katwyk 1995-4-22 12138 Colusa Inner North Coast Ranges; On S side of Leesville Rd. approx. 3 m. N of Hwy 20. Comment
  UC1613289  Plectritis ciliosa subsp. ciliosa Charles M. Belshaw 1937-4-25 2848 Colusa vicinity of Cook's Spring, Devil's Ridge; Inner N. Coast Range Comment
  UC999845  Plectritis ciliosa subsp. ciliosa S. C. Dyal, A. Carter, E. Crum 1938-5-7 683 Colusa near Williams 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
  CDA32826  Plectritis congesta subsp. brachystemon P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 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
  CHSC86883  Plectritis macrocera B. Castro; Beth Hendrickson 2003-3-24 1400 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 268 Comment
  JEPS16087  Plectritis macrocera Rimo Bacigalupi, Arthur Holmgren 1950-4-26 3171 Colusa 7.7 mi w of Sites (Grapevine Grade to Lodoga) Comment
  JEPS16219  Plectritis macrocera Rimo Bacigalupi, Arthur Holmgren 1950-4-26 3171 Colusa 7.7 mi w of Sites (Grapevine Grade to Lodoga) Comment
  UCD67594  Plectritis macrocera Charles Martin 1986-5-17 33 Colusa Mendocino National Forest, along Forest Rd. 17NO2, 3.2 miles south of junction with Forest service road 18NO1, Mill Valley campground. In wet meadow, growing in moist soil. Herb, ca. 1ft tall. Small purple flowers in a head, ca. 1 ft tall. Comment
  UC999822  Plectritis macrocera S. C. Dyal, A. Carter, E. Crum 1938-5-7 696 Colusa south central Colusa County Comment
  UCD41210  Plectritis macrocera John Snelling 1986-5-17 3 - Colusa Mill Valley campsite off of Forest Service Road 18N01. Comment
  POM204747  Poa annua A. A. Heller, H. E. Brown 1902-5-2 7449 Colusa Princeton. Comment
  SEINET3411984 Image available Poa annua George K. Helmkamp, E. A. Helmkamp 2012-2-9 18535 Colusa Sacramento Valley: River Road, 7.1 miles N of Colusa; east side of Sacramento River 18 Comment
  CHSC115384  Poa bulbosa Lowell Ahart 2015-4-1 19991 Colusa Burned over in 2012, rocky serpentine outcrop on the north side of State Highway 20, 1/2 mile east of Lake County Line, 12 miles (air) east-northeast of Clear Lake (town), 17 miles (air) west of Williams. Inner Coast Range. 520 Comment
  CHSC27859  Poa bulbosa Dieter D. King 1978-1-2 Colusa Salt Canyon n side of Salt Creek, Hwy 20 11 mi wsw of Williams. 128 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
  HSC41006  Poa bulbosa J. P. Smith, Thomas W. Nelson 1976-4-14 8579 Colusa Mendocino National Forest, confluence of Stony Creek and N Fork of Stony Creek. 427 Comment
  UCD64275  Poa bulbosa Craig D. Thomsen 2000-3-31 2075 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
  UCD163685  Poa secunda Craig Thomsen 1999-4-15 1986 Colusa Bear Valley. About 5 miles north of Hwy 20, west of Bear Valley Rd. Comment
  CAS-BOT-BC236333  Poa secunda subsp. secunda Roxana S. Ferris 1917-4-14 575 Colusa Arbuckle - Rumsey Road. Foothills W of Arbuckle Comment
  CHSC8244  Poa secunda subsp. secunda J. G. Moore 1969-4-12 2 Colusa Hwy 20, 15 mi. w of Williams on n and s sides of road. 106 Comment
  UC883695  Pogogyne douglasii A. A. Heller 1916-6-9 12387 Colusa Coast Range about 2 miles west of Leesville Comment
  CHSC71641  Pogogyne zizyphoroides Michael A. Wolder 1988-5-12 Colusa Colusa National Wildlife Refuge south west of Colusa. At the edge of a seasonal wetland in Tract 20, Cell 1. 16 Comment
  UCR281725  Polanisia dodecandra subsp. trachysperma David Isle 2014-7-27 2137 Colusa Northern California Foothills, north side of Maxwell Road, c. 2 miles west of Sites and 5.8 miles east of summit of Maxwell Grade [Sites-Lodoga Road] 149 Comment
  SEINET3375126 Image available Polygala cornuta var. cornuta Marcus E. Jones 1882-7-3 3316 Colusa Colfax Comment
  POM165592  Polygonum aviculare Roxana Stinchfield 1916-7-11 457 Colusa Sycamore 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
  JEPS75752  Polygonum parryi L. R. Heckard and R. Bacigalupi 1976-9-6 4433 Colusa just e Fouts Camp; Snow Mt. 1859 Comment
  JEPS80764  Polygonum parryi L. R. Heckard and J. C. Hickman 1981-7-30 5731 Colusa meadow n Trout Creek (se side of mt.); Snow Mt. 1828 Comment
  JEPS108782  Polygonum persicaria Lowell Ahart 2006-9-26 13354 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
  JEPS110387  Polygonum persicaria Lowell Ahart 2006-8-9 13132 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  RSA724952  Polygonum punctatum L. Ahart 2006-8-9 13133 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
  JEPS75839  Polygonum sawatchense subsp. sawatchense L. R. Heckard 1974-9-11 3949 Colusa just nw rocky promontory overlooking Fouts Spring 1798 Comment
  UC821244  Polypogon maritimus Roxana Stinchfield 1916-6-17 287 Colusa near College City (Tule); Tule Comment
  CAS-BOT-BC232541  Polypogon monspeliensis A. A. Heller 1902-5-19 5570 Colusa Near Colusa Comment
  CHSC107982  Polypogon monspeliensis B. Castro; L. Janeway 2011-4-27 1865 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
  CHSC77637  Polypogon monspeliensis Heidi West; Caroline Warren, Julie Cunningham, Jenny Marr 1998-5-27 Colusa Vicinity of Antelope Valley, Huffmaster Road, and Sites. 121 Comment
  CHSC94319  Polypogon monspeliensis Lowell Ahart 2006-8-9 13107 Colusa On the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  JEPS110385  Polypogon monspeliensis Lowell Ahart 2006-8-9 13122 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  JEPS75438  Polypogon monspeliensis W. L. Jepson 1934-5-4 16604 Colusa Princeton Comment
  SD225721  Polypogon monspeliensis Carol Witham, Jennifer Buck 2001-4-30 149 Colusa 2 mi. south of the town of Colusa along Hwy 20, east of Hwy 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001 Comment
  UCD61444  Polypogon monspeliensis Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3889 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 NW of parking lot. 339 Comment
  UCD91239  Polypogon monspeliensis A. A. Beetle 1942-5-21 3269 Colusa 12 miles north of Williams. Comment
  JEPS73497  Polystichum imbricans subsp. imbricans L. R. Heckard 1972-7-10 3115 Colusa Trout Creek crossing of trail to Box Springs; Snow Mt. 1828 Comment
  JEPS75871  Polystichum imbricans subsp. imbricans L. R. Heckard 1974-9-9 3857 Colusa ca. 1/4 mi se Foutch Camp; Snow Mt. 1828 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
  UCD67085  Potamogeton diversifolius Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5107 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western edge of ranch on ridge above Cache Creek Canyon. Spring-fed stock pond at base of uphill climb east side of ridge trail. 510 Comment
  CHSC43804  Potamogeton natans Vernon Oswald 1984-7-20 1624 Colusa Lily Pond n of Letts Lake in Mendocino National Forest. In a pool on a streamlet in the meadow. 1280 Comment
  UCD39221  Potamogeton nodosus Beecher Crampton 1963-8-5 6870 Colusa 1/4 mile E of Cortena. Comment
  UCD81888  Potamogeton nodosus Ellen Dean; Bear Creek Ranch Grazing Committee 2009-6-19 5772 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
  CHSC46886  Potamogeton pusillus var. tenuissimus Vernon Oswald 1989-9-12 4006 Colusa Letts Lake in the Mendocino National Forest, ca. 10 mi (air) sw of Stonyford. On the edge of the lake. 1365 Comment
  RSA666315  Potentilla drummondii Barbara Ertter 1989-7-2 8627 Colusa Long Glade, a V shaped meadow S of Milk Ranch just W of snow Mt West, about 11 airmiles due W of Stonyford. 1957 Comment
  UCD35780  Poterium sanguisorba Beecher Crampton 1962-4-17 6217 Colusa Sycamore. Comment
  JEPS8022  Proboscidea louisianica subsp. louisianica Rimo Bacigalupi with L. R. Heckard 1951-8-6 3471 Colusa 4.6 mi nw Sites (along road between Sites and Lodoga) Comment
  UCD122109  Proboscidea louisianica subsp. louisianica Rimo Bacigalupi; L R. Heckard 1951-8-6 3471 Colusa along road between Sites and Lodoga, 4.6 mi. N.W. of Sites. Comment
  JEPS75725  Prunus emarginata L. R. Heckard 1974-9-9 3860 Colusa w of Trout Creek crossing on trail from Foutch CAmp (Snow Mountain); Snow Mountain 1828 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
  POM174580  Prunus virginiana var. demissa Roxana S. Ferris 1926-4-23 6452 Colusa Stream near Ladoga Comment
  UCD84572  Prunus virginiana var. demissa Ellen Dean; C. Thomsen, G. Harrington, Davis Botanical Society 2010-6-5 6097 Colusa Colusa County. On Lake County border. Walker Ridge. Along Walker Ridge Goad, between Cold spring and Buck Flat. 971 Comment
  UCD159336  Pseudognaphalium californicum D. S. Park; E. Dean 2010-6-5 120 Colusa Walker ridge, Cold Spring Mt. roadside on exposed slope. 935 Comment
  UCD67072  Pseudognaphalium californicum Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5099 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
  SEINET3367922 Image available Pseudognaphalium luteoalbum Richard R. Halse 2012-3-25 8419 Colusa Williams, Weedy area behind the Chinese Restaurant on D street 24 Comment
  UCD91510  Pseudoroegneria spicata Freed W. Hoffman 1944-7-13 1964 Colusa Western Colusa County. North Coast Ranges. Between Indian and Bear Valleys. Comment
  CHSC101626  Psilocarphus brevissimus var. brevissimus David W. Isle 2002-4-18 1657 Colusa Mendocino National Forest; N of Fouts Springs, N of Chlorinator Building on road to Bathhouse Trail (Snow Mtn.) Edge of E-flowing ephemeral drainage in chamise site burned during 8/8/01 Trough Fire and part of Helicopter Hydromulch Study Plot. 524 Comment
  JEPS40460  Psilocarphus brevissimus var. brevissimus W. L. Jepson 1934-5-3 16598 Colusa College City Comment
  CHSC79256  Psilocarphus oregonus B. Castro; L. P. Janeway 2000-4-10 1062 Colusa Vicnitiy of Sites in rolling hills near Sulphur Gap, among un-named tributaries to Lurline Creek. 91 Comment
  UC638695  Psilocarphus tenellus Ethel Crum 1938-5-7 2010 Colusa 4.2 mi n Rumsey; Inner North Coast Range, Comanche Hills 254 Comment
  UCD135314  Psilocarphus tenellus George F. Hrusa 1989-5-7 6087 Colusa slopes on north side above Little Stony Creek approximately 4 meters from intersection of Ceder Mountain Road and Stonyford-Lodoga Road. Comment
  CHSC80346  Psilocarphus tenellus var. tenellus Caroline Warren; Joyce Lacey-Rickert 1998-5-8 Colusa Vicinity of Sites and Antelope Creek. 91 Comment
  JEPS121101  Pterostegia drymarioides Lowell Ahart 2013-5-1 18669 Colusa On the E side of Bear Valley Road, about 2.5 road miles NW of intersection of Hwy 20 and Bear Valley Road. Comment
  JEPS75754  Pyrola dentata L. R. Heckard and R. Bacigalupi 1976-9-6 4436 Colusa East of Trout Creek crossing, Snow Mountain 1859 Comment
  JEPS80464  Pyrola picta Alice Q. Howard 1972-7-10 8 A Colusa Trail from Fouts Camp to Box Springs, tje highest of the two such areas on the North side of the ridge separating Trout and Paradise Creek. Snow Mountain 1676 Comment
  SFV10851  Pyrola picta M. L. Vincent 1968-6-6 789 Colusa On road to Stony Ford from Goat Mountain, 2.4 miles west of Old Mills Campground. 1220 Comment
  CDA16102  Quercus berberidifolia G. F. Hrusa, Dmitri Geltman (LE) 1999-8-18 15251 Colusa North Coast Ranges; Goat Mtn. Rd., +/- 1/4 mi W of Pine Flat camp. 426 Comment
  UCD83754  Quercus chrysolepis Ellen Dean; G. Harrington, K. Mawdsley, J. Shepard 2010-5-1 5951 Colusa Walker Ridge. Along Walker Ridge Road. 10 road miles N of intersection with Hwy 20. Just N of radio tower at Cold Spring Mountain on border with Lake County. 971 Comment
  UC993117  Quercus douglasii J. M. Tucker 1948-9-22 1869 Colusa 11.3 mi w Williams (beside road to Venado) Comment
  UC993118  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
  UC993121  Quercus douglasii J. M. Tucker 1948-9-22 1869 Colusa 11.3 mi w Williams (beside road to Venado) Comment
  UCD57708  Quercus douglasii Daniel Chau; 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. Eastern part of ranch, ca. 2 road miles south of intersection of State Routes 20 and 16. Along unimproved road in the mouth of Craig Canyon. 313 Comment
  UCD45869  Quercus dumosa Hans G. Jung 1976-4-17 6 Colusa California, Colusa County: 2 miles west of Bear Valley, on north end of Walker Ridge, T15N, R6W, sec. 11. Elevation 1800 feet. 548 Comment
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Apr 18 2009
  UCD55461  Quercus durata Ellen Dean; Gordon Harrington 2006-10-6 3285 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 381 Comment
  UCR52364  Quercus durata L. Blackford, S. Branch, D. Malm 1988-4-16 62 Colusa 6.1 mi. on Walker Ridge Road off Hwy 20 at Blue Oak campground 732 Comment
  CHSC48382  Quercus durata var. durata Vernon Oswald 1986-5-12 2008 Colusa Brim Rd. (Bartlett Springs Rd.) 1.8 mi w of Bear Valley Rd. 502 Comment
  HSC31697  Quercus durata var. durata Thomas E. Higley 1974-5-4 64 Colusa 3/4 mi. N of T junction of Indian Valley. 854 Comment
  HSC71309  Quercus durata var. durata Thomas W. Nelson, Jane P. Nelson 1979-4-12 4617 Colusa Along Stony Creek below Digger Pine Campground Comment
  CHSC92580  Quercus garryana var. breweri D. Isle 2005-7-14 1154 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
  JEPS75761  Quercus garryana var. breweri L. R. Heckard, and R. Bacigalupi 1976-9-6 4450 Colusa Fouts Camp-Summit Spring trail Snow Mt. 1615 Comment
  RSA758621  Quercus lobata George K. Helmkamp 2008-10-14 14258 Colusa Sacramento Valley: along CA-20, 0.2 mile east of the Sutter County Line 9 Comment
  RSA759171  Quercus lobata Doug Goldman 2004-11-1 2916 Colusa East side of Route 45 (Princeton Road). 23 Comment
  UC1179011  Quercus lobata Herbert L. Mason 1947-3-29 13153 Colusa ca 3 mi ne Colusa (along Butte Creek); Butte Sink, Butte Creek Comment
  UCD14526  Quercus palmeri Roger Raiche 1990-12-2 C Colusa California, Colusa Co.; across Sulphur Creek from Wilbur Springs; Comment
  JEPS73455  Quercus vacciniifolia L. R. Heckard 1972-7-8 3056 Colusa se of Snow Mt.; West Peak 1981 Comment
  CAS-BOT-BC104659  Quercus wislizeni L. Blackford; S. Branch; D. Malm 1988-4-16 63 Colusa 13.8 miles of Hwy. 20 on Walker Ridge Road 975 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
  UCD84512  Quercus wislizeni var. frutescens Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6063 Colusa Colusa County. On Lake County border. Walker Ridge. Along Walker Ridge Road, between Cold Spring and Buck Flat. 971 Comment
  CHSC112222  Rafinesquia californica Lowell Ahart 2013-5-1 18670 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
  RSA275336  Rafinesquia californica Thomas W. Nelson, Jane P. Nelson 1978-4-29 3926 Colusa Growing along Bear Valley Road ca. 2 miles from junction with State Route 20. 366 Comment
  UC768665  Rafinesquia californica R. F. Hoover 1938-4-24 3211 Colusa Upper Sand Creek Comment
  UCD82383  Rafinesquia californica Craig Thomsen; G. Harrington 2009-5-12 2824 Colusa Colusa County. Walker Ridge. South of spur road en route to Eaton Springs, about 1/2 mile east of Walker Ridge Rd. About 200 yds south of road (ravine with spring below). 822 Comment
  UCD66456  Ranunculus arvensis Craig D. Thomsen 2000-5-12 2324 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-BC378937  Ranunculus californicus var. californicus Roxana Ferris 1926-4-21 6296 Colusa abandoned rice field 2 mi west of Colusa Comment
  UCD163664  Ranunculus canus Craig Thomsen 1998-6-10 1964 Colusa Bear Valley. About 7.5 miles north of Hwy 20. Comment
  UCD163869  Ranunculus canus Craig D. Thomsen 2000-3-31 2078 a 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
  UCR206701  Ranunculus canus George K. Helmkamp, E. A. Helmkamp 2009-3-17 14391 Colusa Inner North Coast Ranges Foothills, along CA-16 and Bear Creek, 4.3 miles south of the junction with CA-20 261 Comment
  SEINET4208544  Ranunculus canus var. canus Richard R. Halse 2013-3-26 8740 Colusa Along the Leesville Road ca. 5.6 miles northwest of its junction with State Hwy. 20, west of Williams.; 0 157 Comment
  SEINET8696617  Ranunculus canus var. canus R. R. Halse 2013-3-26 8740 Colusa Along the Leesville Road, ca. 5.6 miles NW of its junction with CA Hwy 20, W of Williams. 157 Comment
  CHSC62943  Ranunculus hebecarpus Vernon H. Oswald; Lowell Ahart 1994-4-6 6057 Colusa Goat Mtn. Rd. 0.1 mi NE of Digger Pine Flat, S of Stonyford. On a roadside bank. 463 Comment
  CHSC79555  Ranunculus hebecarpus B. Castro; L. P. Janeway 2000-5-4 1127 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 246 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
  UC72903  Ranunculus hebecarpus Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  SEINET12091613  Ranunculus hebecarpus S. E. Booth 1981-1 1 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, ca 11 mi wsw of Williams. Wilbur Springs Quadrangle 15 143 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
  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
  CHSC38161  Ranunculus occidentalis var. occidentalis Vernon Oswald 1983-3-28 225 Colusa About 22.2 mi s and e of Stonyford on the Sites-Lodoga Rd. On a road cut. 213 Comment
  SEINET255530  Raphanus raphanistrum Richard R. Halse 2007-3-22 7105 Colusa Williams; by the junction of 5th Street and B Street. 25 Comment
  RSA0115435  Raphanus sativus George K. Helmkamp, Elizabeth Helmkamp 2014-1-4 22509 Colusa Sacramento Valley: along CA-20 at Sycamore Cutoff, 1.3 miles west of the Sacramento River crossing. 20 Comment
  UCD13218  Raphanus sativus Steve Daniel 1986-4-13 9 Colusa California: Colusa Co. Bear Valley, 7.6 mi N of hwy 20 along Bear Valley rd. elev. ca. 1300 ft. 396 Comment
  UCR206871  Raphanus sativus George K. Helmkamp, E. A. Helmkamp 2009-1-31 14318 Colusa Sacramento Valley, along River Road, 0.9 mile north of the city of Colusa 17 Comment
  JEPS75868  Rhamnus californica L. R. Heckard 1974-9-10 3880 Colusa East Circle Trail, along spur running se from the w peak, Snow Mt. Snow Mt. 2011 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
  UCD117941  Rhododendron occidentale George F. Hrusa 1989-5-5 6066 Colusa Open margin of Little Stony Creek, along Rd. to Cedar Camp. 1.5 m. SW of intersection of Stonyford-Lodoga Rd. 470 Comment
  HSC62926  Rhus aromatica Marla J. Carollo 1979-4-14 26 Colusa Buch Flat on Walker Ridge Rd. 884 Comment
  UCSB26060  Rhus aromatica Belshaw, Charles 1937-4-25 Colusa Cooks Springs Comment
  UCD15256  Rhus diversiloba R. A. Harris 1974-5-5 051 Colusa Robberts Flat, off of Bartlett Springs road. 487 Comment
  CAS-BOT-BC168901  Ribes malvaceum Eric Peterson; Matt Foruria; Tom Ward 1995-4-2 59 Colusa 4.3 north on Walker Ridge Road from jct with Hwy 20 822 Comment
  CHSC90878  Ribes roezlii D. Isle 2003-6-24 214 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. UTM's: 10S 0523825E 4346753N. 1767 Comment
  HSC48145  Rigiopappus leptocladus Thomas W. Nelson, Jane P. Nelson 1978-4-30 3966 Colusa Along Hwy. 20, E of Colusa-Lake county line 549 Comment
  POM174572  Rigiopappus leptocladus Roxana S. Ferris 1926-4-23 6589 Colusa Near Stonyford. Comment
  UC1543162  Rigiopappus leptocladus Charlotte G. Nast 1936-4-17 148 Colusa Williams to Lake Co. Road 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
  UC903228  Rigiopappus leptocladus Ethel Crum 1932-5-8 1452 Colusa Stonyford Inner North Coast Ranges 426 Comment
  UCD166310  Rigiopappus leptocladus Jack Major 1962-4-28 806 Colusa At entrance to Bear Valley. (Exact location unknown. Coordinates estimated by label maker.) 381 Comment
  CHSC86881  Rorippa nasturtium-aquaticum B. Castro; S. Innecken 2003-4-2 1412 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Grapevine Creek. In bottom of small stream. 167 Comment
  CHSC94411  Rorippa nasturtium-aquaticum Lowell Ahart 2006-8-9 13156 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS80215  Rorippa nasturtium-aquaticum L. R. Heckard and J. Hickman 1980-7-3 5371 Colusa Summit Springs sw slope Snow Mt., Summit Springs 1554 Comment
  CHSC84231  Rosa californica Lowell Ahart 2003-7-14 10389 Colusa On the west side of Bear Valley Road, about 1/4 mile north of the intersection of Bear Valley Road and Wilber Springs Road and bridge. 379 Comment
  CHSC88586  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
  UCD63733  Rosa californica Craig D. Thomsen 2008-5-23 2743 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. 421 Comment
  CAS-BOT-BC158727  Rubus ursinus Roxana S. Ferris 1926-4-21 6310 Colusa Oak Graove Sycamore Slough, near Sycamore Comment
  UCD61437  Rumex pulcher Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3882 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
  CDA2395  Saccharum ravennae Gordon Leppig 2001-3-29 1541 Colusa Route 16, 100 meters east of mile marker 4.58. 0 Comment
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Jul 31 2014
  HSC102730  Saccharum ravennae J. P. Smith 2013-8-23 13779 Colusa Along State Route 16 above Cache Creek. 192 Comment
  UCD138041  Sagittaria latifolia Herbert L. Mason 1945-9-19 12713 Colusa Sacramento river, 1 mile north of Colusa on east side, below causeway. Comment
  UCD138020  Sagittaria longiloba June McCaskill 1954-8-23 374 Colusa 7 miles east of Arbuckle, jus north of the road east from Arbuckle. Comment
  UCD138022  Sagittaria longiloba June McCaskill 1954-8-9 367 Colusa Grimes - Knights Landing Highway, ca. 3 miles south of Grimes. Comment
  UCD138036  Sagittaria montevidensis subsp. calycina Herbert L. Mason; Verne Grant 1946-8-7 12981 Colusa 8 miles north of Colusa. Comment
  CAS-BOT-BC103026  Salix bonplandiana Roxana S. Ferris 1926-4-23 6401 Colusa near Mountain House on Williams - Stonyford Road Comment
  CHSC62849  Salix breweri Vernon H. Oswald; Lowell Ahart 1994-3-23 6016 Colusa Frenzel Creek Research Natural Area on the S side of Little Stony Creek, in the section of the E side of Frenzel Creek, S of Stonyford. 518 Comment
  UCD163852  Salix breweri Craig D. Thomsen 2000-6-7 2368 a Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCD56940  Salix breweri Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3542 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Thompson Canyon. 344 Comment
  UCD81722  Salix breweri Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5726 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
  UCD163863  Salix exigua Craig D. Thomsen 2001-5-31 2548 Colusa Bear Creek Canyon south of Sulphur Creek confluence. About 3 miles north of Hwy 20. Comment
  UCD84434  Salix exigua Jack Alderson 2009-4-8 32 Colusa BLM Bear Creek Ranch (Previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. Brophy Canyon. 304 Comment
  UCD16133  Salix laevigata G. Robinson 1984-4-21 8 Colusa California. Colusa County: Bear Valley, 3.3 mi N of hwy 20, about 80-90 m W of Wilbur Springs Rd., top of rise above creek flood plain. 390 Comment
  UCD164151  Salix laevigata Craig Thomsen 2000-3-31 2045 Colusa Bear Creek Canyon. About 5 miles north of Hwy 20, about 0.5 mile south of Wilbur Bridge. Comment
  UCD164153  Salix laevigata Craig Thomsen 1999-4-27 1999 Colusa Bear Creek Canyon. Along Bear Creek, just north of Sulphur Creek confluence, next to Wilbur Bridge. 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
  UCR198150  Salix laevigata Ellen Dean, C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3677 Colusa BLM Payne Ranch, lands to the southwest of junction of Hwy 20 and Hwy 16. Thomposon Canyon, near juncture with Craig Canyon 363 Comment
  CDA12801  Salix lasiolepis G. F. Hrusa 1996-2-26 12636 Colusa Serpentine Flora of California; Little Stony Creek. Goat Mtn. Rd. approx. 3 miles SW of intersection with Stonyford-Lodoga Rd. Comment
  CHSC96763  Salix lasiolepis G. F. Hrusa 1999-5-16 15049 Colusa North Coast Ranges. UTM 10S, 4346931 N, 0523542 E. Below summit ridge of Goat Mountain on S side. 1722 Comment
  JEPS80057  Salix lasiolepis L. R. Heckard with J. Hickman 1979-6-15 5057 Colusa along eastern trail from Frog Camp (n of West Peak) to Saddle (Snow Mt.); Snow Mt. 2072 Comment
  UCD163850  Salix lasiolepis Craig D. Thomsen 2000-6-7 2367 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCD84433  Salix lasiolepis Jack Alderson 2009-4-8 33 Colusa BLM Bear Creek Ranch (Previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. Brophy Canyon. 304 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
  CHSC101508  Salsola australis P. Akers 2003-10-7 Colusa 5th St. and Hillgate Rd., Arbuckle, just e of Hwy 5 behind Shell Station on RR tracks. Comment
  CHSC27518  Salvia columbariae Michael F. Henetz 1978-4-15 16 Colusa Ca. 65 m n of Salt Creek, ca 15 m n of Hwy. 20, ca. 17.7 km wsw of Williams. 143 Comment
  CHSC60750  Salvia columbariae Vernon H. Oswald; Lowell Ahart 1993-5-27 5432 Colusa Sites-Lodoga Rd. ca. 0.4 mi W of Grapevine Pass (4.6 road mi E of Lodoga). 481 Comment
  CHSC79524  Salvia columbariae B. Castro; L. P. Janeway 2000-5-4 1137 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 249 Comment
  UCD41199  Salvia columbariae James Salyards 1986-5-17 86 - Colusa Along Sites-Lodoga Road, 8.2 mi. west of Sites. Comment
  HSC85862  Salvia columbariae R. Earing, C. Cavanaugh, C. Collins 1987-4-12 86 Colusa Leesville Grade Comment
  RSA60351  Sambucus mexicana G. R. Campbell 1948-6-18 652 Colusa 2 miles south of Wilbur Springs 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
  CHSC81212  Sanicula bipinnatifida J. Trizzino 2001-3-31 15 Colusa Bear Valley Meadow along east side of Bear Valley Road. 396 Comment
  UC106104  Sanicula bipinnatifida T. Brandegee March 1889 Colusa Leesville 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
  CDA34108  Sanicula bipinnatifida P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  POM174565  Sanicula bipinnatifida Roxana S. Ferris 1926-4-23 6421 Colusa On grade, Williams- Stonyford Road Comment
  UCD57664  Sanicula crassicaulis Erica A. Smith; with Plant Biology 102 2007-4-29 2 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central/Eastern part of ranch. Craig Canyon. Along unimproved road, where road crosses Craig Creek. 313 Comment
  UCD66606  Sanicula tuberosa Craig D. Thomsen 2000-5-11 2282 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
  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
  POM185714  Schoenoplectus maritimus Roxana Stinchfield 1916-7-11 467 Colusa Davis Tule, near Sycamore Slough. 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
  SEINET9769686 Image available Schoenoplectus tabernaemontani Richard Carter 2006-7-31 Colusa 3.7 mi SSE Colusa, jct. Hwy CA 20 and Hwy CA 45 Comment
  CDA417  Scirpus glaucus Kingwill 1929-8-23 Colusa 0 Comment
  UC1100902  Scirpus maritimus Malcolm A. Nobs, S. Galen Smith 1949-9-9 1872 Colusa rice fields 3 mi w Williams; w of Williams Comment
  UCR261651  Scleranthus annuus subsp. annuus Ann Howald 2003-4-24 2318 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, peninsula c. 2 miles north of Lodoga, Big Boot camping area 365 Comment
  UC769882  Scribneria bolanderi R. F. Hoover 3207 Colusa Upper Sand Creek Comment
  UCD83760  Scribneria bolanderi Ellen Dean; G. Harrington, K. Mawdsley, J. Shepard 2010-5-1 5956 Colusa Colusa County. Walker Ridge. Along Walker Ridge Road, Buck Flat. 875 Comment
  CHSC86868  Scrophularia californica B. Castro 2003-4-10 1420 Colusa Vicinity of Logan Ridge, Sulphur Gap and Lurline Creek. Cutbank of dirt road. 131 Comment
  UCD82729  Scutellaria Craig Thomsen; G. Harrington 2009-5-14 2910 b 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
  CHSC75613  Scutellaria californica Vernon H. Oswald; Lowell Ahart 1999-6-22 9775 Colusa West of Stonyford on Fouts Springs Rd. (M10) 0.5 mi east of Dixie Glade Picnic Area. 975 Comment
  UCD66927  Scutellaria californica Craig D. Thomsen; G. Harrington 2008-7-6 2770 Colusa BLM Payne Ranch. Lands to the SW of the jct of Hwys 20 and 16. Western side of ranch, near ridge trail that follows the border of Colusa/Lake Counties. Dunsfield Flat stock pond. 609 Comment
  UCD81706  Scutellaria californica Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5714 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
  UCR225654  Scutellaria californica Craig D. Thomsen, Gordon Harrington 2008-7-6 2770 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 20 and 16. Western edge of ranch, near ridge trail that follows the border of Colusa/Lake Counties. Dunsfield Flat stock pond 610 Comment
  UC1299474  Scutellaria siphocampyloides Freed W. Hoffman 1947-6-19 1661 Colusa Cooks Springs, western Colusa County Cooks Springs Comment
  CHSC117779  Scutellaria siphocampyloides David Isle; Terril Wolt 2016-6-16 2165 Colusa North Coast Range:~3/4 mile NE of Fotus Springs and ~1/4 mile west of Davis Flat on S bank of serpentine rivulet. Fouts Springs, California. 499 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
  JEPS62862  Scutellaria tuberosa Alice King May 1906 Colusa College City Comment
  CHSC101592  Senecio sylvaticus David W. Isle 2002-4-18 1660 Colusa Mendocino National Forest; N of Fouts Springs, N of Chlorinator Building and road to Bathhouse Trailhead. MDB and M. 524 Comment
  CAS-BOT-BC243614  Setaria pumila Milo S. Baker 1946-9-4 11602 Colusa Butte Sink, West Gridley Road Comment
  UCD92837  Setaria viridis Beecher Crampton 1958-6-26 4974 Colusa along Grieve Road, 5.5 miles south of College City. Comment
  UCD121993  Sherardia arvensis V. C. Bryant 1925-10-10 s.n. Colusa Arbuckle. Comment
  JEPS94196  Sidalcea diploscypha Vernon Oswald and Lowell Ahart 1998-5-7 9003 Colusa Bartlett Springs Rd. 2.1 mi. w. of Bear Valley Rd., 0.8 mi. e. of Sawtelle Valley and Grapevine Flat Rds. 524 Comment
  UC1733754  Sidalcea diploscypha Kay H. Beach 1940-5-16 657 Colusa Colusa and Lake county line Comment
  UCD57838  Sidalcea diploscypha Gordon Harrington; Diana Hickson, Jack Alderson 2007-4-29 40 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
  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
  UCD23423  Sidalcea diploscypha David Rhode 1977-4-30 22 Colusa Bear Valley, 2.1 miles north of Wilbur Springs. Dry gravel, west facing slope in sparse valley grassland pasture. Comment
  UCD23424  Sidalcea diploscypha Robert E. Rolley 1977-5-8 21 Colusa Annual erect herb, 20-40 cm tall. Stems covered with many long hairs, upper leaves gray green deeply palmately lobed, lower leaves already dry. Flowers in few flowered heads, lavender, white at base. Grassy, south facing slope, full sun, heavy clay loam. 0.3 miles NNW on Bear Valley Rd. from Hwy 20. Comment
  UCD82538  Sidalcea hartwegii Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5691 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 817 Comment
  RSA756334  Sidalcea keckii David Gowen 2008-5-24 921 Colusa Stoneyford Ladoga Road, about 1.6 miles south of Stoneyford. Comment
  JEPS80829  Sidalcea oregana subsp. hydrophila L. R. Heckard and J. C. Hickman 1981-7-31 5800 A Colusa e side Snow Mt. , Dark Hollow Creek (Dark Hollow Creek) 1645 Comment
  CDA15466  Silene californica G. F. Hrusa, WTD 1998-6-19 14603 Colusa North Coast Ranges; Upper Little Stony Creek. Goat Mtn. Rd. ~ 2 km. W of campground. Comment
  UC1334722  Silene californica Eugene Memmler 1969-5-8 102 Colusa Hgwy 20 between Williams and Clear Lake; Valley side of Coastal Hills, btwn Williams and Clear Lake 152 Comment
  POM253020  Silene californica A. A. Heller 1937-4-24 15351 Colusa On Highway #20, 15 miles west of Williams. Comment
  SD72209  Silene californica Eugene Memmler 1969-5-8 102 Colusa Valley side of coastal hills between Williams and Clear Lake, Highway 20. 149 Comment
  CDA12223  Silene campanulata subsp. glandulosa G. F. Hrusa 1993-5-2 10861 Colusa Frenzel Creek Research Natural Area; Mid-canyon of Frenzel Creek, tributary of Little Stony Creek. Comment
  CHSC27734  Silene laciniata subsp. californica W. K. Cheechov 1978-4-9 8 Colusa 5.1 mi w of Walker Ridge Rd., Hwy 20. 457 Comment
  CHSC79487  Silene laciniata subsp. californica B. Castro; L. P. Janeway 2000-5-3 1125 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 313 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
  SFV11278  Silene laciniata subsp. californica M. L. Vincent 1968-6-6 780 Colusa 1.2 miles west from Stony Ford. 11 mile sign on trip down from Goat Mountain. 375 Comment
  CAS-BOT-BC388981  Silene laciniata subsp. californica Roxana S. Ferris 1926-4-23 6444 Colusa Near top of Grapevine Grade on Stonyford-Setco Road Comment
  UCD99009  Silene laciniata subsp. californica Kathleen A. Robson 1981-5-25 41 Colusa from Stonyfield, take Fouts Spring Road 8 miles west to Fouts Springs, continue 1 mile West along roadside. 579 Comment
  JEPS83163  Sinapis alba L. R. Heckard with J. Hickman 1980-7-3 5332 a Colusa SW Snow Montain, just W of Summit Springs 1548 Comment
  CAS-BOT-BC74903  Sinapis arvensis Roxana S. Ferris 1917-4-12 513 Colusa 4 mile east of Williams. Comment
  SEINET11094167  Sinapis arvensis Unknown 2010-3-20 7826 Colusa Flora of California, USA. Colusa Co., California. Along State Hwy. 20 ca. 5.4 miles west of Colusa (Junction of State Hwys. 20 & 45) elev. 17 m. 39.19004d N 122.10456d W WGS84 Habitat: Weedy roadside ditch. Flowers bright yellow; plants to 1.2 meters tall. 17 Comment
  UCD61438  Sisymbrium altissimum Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3883 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1000 ft NNW of parking lot. 314 Comment
  UCD63623  Sisymbrium altissimum Craig D. Thomsen 2008-3-21 2720 Colusa BLM Payne Ranch. 0.25 mile south of intersection of Hwy 16 and Hwy 20. Between Bear Creek and Hwy 16. Comment
  CAS-BOT-BC75280  Sisymbrium officinale Roxana S. Ferris 1926-4-21 6272 Colusa On Sycamore Slough 2 miles west of Sycamore. 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
  RSA0115083  Sisyrinchium bellum Lowell A. Ahart, John Dittes, Josephine Guardino 2013-4-26 18644 Colusa 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. 567 Comment
  UCD64292  Sisyrinchium bellum Craig D. Thomsen 2000-4-12 2134 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCD82502  Sisyrinchium bellum Craig Thomsen; G. Harrington 2009-5-12 2861 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  CHSC118887  Sisyrinchium bellum David Isle; Frank Pendell 2017-5-17 2173 Colusa Foothils E edge of N Coast Range: W of Stonyford ~1.5 miles on 18N01.1 to Frank and Sheri Pendell Ranch; in black adobe pasture S of house ~1/8 mile. 381 Comment
  HSC62938  Sisyrinchium bellum Michael Dalke 1979-4-14 49 Colusa Bear Valley Rd., 13 mi. N of Hwy. 20 396 Comment
  IRVC29851  Smilacina racemosa Mark A. Elvin, Mark S. Brunell, David Isle 2006-8-3 5038 Colusa Snow Mtn; Summit Spring Trail; between Snow Mtn West summit and Cedar Camp. Southern Northern Inner Coast Ranges 2012 Comment
  CDA33581  Solanum elaeagnifolium Robin Breckenridge 2010-8-17 PDR# 1313487 Colusa Interstate 5 north, 1 mile before Hahn Rd. exit. 0 Comment
  NY821077  Solanum parishii R. C. F. Bacigalupi 1950-4-25 3175 Colusa "Grapevine Grade" to Lodoga, ten miles northwest of Sites Comment
  UCD57555  Solanum parishii Andrew Pedersen; with Plant Biology 102 2007-4-29 4 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Meadow on the west side of State Route 16, ca. 2 road miles south of intersection with State Route 20. West side of Bear Creek, at confluence with Craig Creek. 304 Comment
  JEPS16203  Solanum umbelliferum Rimo Bacigalupi, Arthur Holmgren 1950-4-25 3175 Colusa 10 mi nw of Sites (Grapevine Grade to Lodoga); Grapevine Grade Comment
  CHSC101399  Solidago elongata David Isle 2001-7-26 1576 Colusa SW side of Letts Lake; N of day use area; N of trail between swamp thistle and tule patch. 1377 Comment
  CHSC91068  Solidago velutina subsp. californica D. Isle 2002-8-12 180 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. 585 Comment
  HSC94133  Solidago velutina subsp. californica G. Fred Hrusa 1998-10-28 14900 Colusa Roadside along Cedar Camp Rd. as it enters Little Stony Creek Canyon, approx. 1 mi. from Lodoga/Stonyford Rd. 400 Comment
  CDA32941  Sonchus oleraceus Doug Barbe & Phyllis Hiatt 1979-5-2 Colusa Williams; waste ground by Shell station. 0 Comment
  CAS-BOT-BC235304  Sorghum halepense Herbert L. Mason 1945-9-19 12723 Colusa Below causway over Butte Sink spillway, east bank of Sacramento River, 1 mile north of Colusa Comment
  UCR201571  Sorghum halepense George K. Helmkamp, E. A. Helmkamp 2008-10-14 14268 Colusa Sacramento Valley, along River Road (generally following the Sacramento River), 8.4 miles north of Colusa 17 Comment
  UCR206354  Spergularia George K. Helmkamp, E. A. Helmkamp 2009-3-11 14382 Colusa Sacramento Valley, along CA-20, 0.1 mile east of its junction with I-5, north end of Williams 49 Comment
  CAS-BOT-BC390067  Spergularia atrosperma Roxana S. Ferris 1917-4-12 509 Colusa 4 miles East of Williams Comment
  UCD99217  Spergularia macrotheca var. leucantha Malcolm A. Nobs; S. Galen Smith 1949-6-18 874 Colusa Highway 99 W, 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
  CHSC79491  Spergularia marina L. P. Janeway; B. Castro 2000-3-23 6634 Colusa Vicinity of Funks Creek and Glenn-Colusa Canal. 47 Comment
  CAS-BOT-BC390765  Spergularia marina G. B. Rossbach; R. P. Rossbach 1938-5-31 636 Colusa 2 mi. so. of Maxwell Comment
  CAS-BOT-BC390768  Spergularia marina G. B. Rossbach; R. P. Rossbach 1938-5-31 639 Colusa 6 mi. west of Colusa Comment
  CAS-BOT-BC390769  Spergularia marina G. B. Rossbach; R. P. Rossbach 1938-5-31 637 Colusa 2 mi. so. of Maxwell Comment
  CHSC80392  Stachys ajugoides var. rigida Caroline Warren; Jenny Marr, Heidi West, Natalie Wight 1998-6-11 Colusa Vicinity of Funks Creek and Logan Ridge. 106 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
  CHSC95011  Stachys ajugoides var. rigida Lowell Ahart 2006-10-31 13539 Colusa On the south side of road M 10, about 6 miles by road west of Stonyford. 583 Comment
  CHSC106246  Stachys albens B. Castro; L. P. Janeway 2001-6-3 1256 Colusa Inner North Coast Ranges. Spring at Grapevine flat, on top of Walker Ridge about 0.5 mi E of Baldy Mountain. East-facing slope/bench with large springy/meadowy area. 880 Comment
  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
  JEPS94742  Stachys albens Vernon H. Oswald and Lowell Ahart 1998-7-15 9268 Colusa Bartlett Springs Road 1.6 mi w of Bear Valley Road; Bartlett Springs Road 487 Comment
  UCD70231  Stachys albens D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley Road. Bear Valley Creek. 370 Comment
  RSA0109095  Stachys pycnantha L. Ahart 2006-8-9 13092 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3.5 miles (air) west of Stonyford. 455 Comment
  RSA724895  Stachys rigida subsp. quercetorum L. Ahart 2006-8-22 13235 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
  JEPS120802  Stachys rigida var. rigida Lowell Ahart 2013-10-1 19080 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
  RSA0118627  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
  UCD112598  Stellaria nitens Christopher Mallek 2008-4-17 WR2- 2 Colusa Walker Ridge. Border of Colusa and Lake Counties. 802 Comment
  CHSC94466  Stellaria pallida Lowell Ahart 2006-8-9 13165 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 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
  JEPS80756  Stephanomeria lactucina L. R. Heckard and J. C. Hickman 1981-7-29 5723 Colusa spur about 1 km se Summit Springs (s side of Snow Mt.); Snow Mt. 1554 Comment
  CDA15548  Stephanomeria virgata subsp. pleurocarpa G. F. Hrusa 1998-10-28 14899 Colusa North Coast Ranges; Cedar Camp Rd. as it enters Little Stony Ck. Cyn., approx. 1 mi. from Lodoga/Stonyford Rd. 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
  JEPS110412  Stephanomeria virgata subsp. pleurocarpa Lowell Ahart 2006-8-9 13099 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford 455 Comment
  UCD169457  Stephanomeria virgata subsp. pleurocarpa Lowell Ahart 2004-10-4 11424 Colusa Leesville Ladoga Road and Leesville Road, northeast of Bear Valley, about 4.7 miles by road southeast of the intersection fo Bear Valley Road, on the east side of Leesville Road. 369 Comment
  UCD61478  Stephanomeria virgata subsp. pleurocarpa Ellen Dean; Gordon Harrington 2006-10-6 3272 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
  UCD111679  Streptanthus Christopher Mallek 2008-1 s.n. Colusa Frenzel Creek. 654 Comment
  SFV10375  Streptanthus breweri M. L. Vincent 1968-6-6 796 Colusa 1.7 miles west of Diversion Dam Campgrounds on Stony Ford Road. 485 Comment
  UC1733757  Streptanthus breweri Kay H. Beach 1940-5-16 1258 Colusa Colusa and Lake county line Comment
  UC1736740  Streptanthus breweri Dean W. Taylor 1998-6-16 16663 Colusa Bear Valley road 1.5 mi NW junction Highway 120; near mouth Warnick Canyon 350 Comment
  UCD115959  Streptanthus breweri D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. 370 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
  UCD38808  Streptanthus breweri Beecher Crampton 1958-5-19 4812 Colusa Colusa County, Little Stony Creek canyon, west of Ladoga. 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
  SEINET11998398  Streptanthus breweri Unknown 1986-1 60216 Colusa S of Snow Mt., nr intersection of road to Summit Springs & roads 17N29 & 24N02 1280 Comment
  UC1051550  Streptanthus breweri var. breweri Helen K. Sharsmith 1953-6-21 4307 Colusa borders of creek ca 1 mi within boundary of National Forest Inner North Coast Ranges, Mendocino National Forest, Little 670 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
  UC956517  Streptanthus breweri var. breweri Freed W. Hoffman 1948-6-28 2295 Colusa Fouts Springs-Letts Valley road 1.5 mi from Fouts Springs 579 Comment
  UCR225264  Streptanthus breweri var. breweri Jack Alderson 2008-4-27 s.n. Colusa BLM Payne Ranch, lands to the southwest of the intersection of Hwys 20 and 16. Slopes to the west northwest of Cowboy Camp on the west side of Bear Creek. 428 Comment
  CAS-BOT-BC87027  Streptanthus drepanoides Volney Rattan 1884-1-1 s.n. Colusa Above Fouts Springs. Comment
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Jul 24 2018
  CHSC35582  Streptanthus glandulosus J. P. Smith; Tom Nelson, Jane Nelson 1978-4-2 9565 Colusa Bear Valley Road, 2.1 miles from its junction with State Route 20. 365 Comment
  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
  CHSC90181  Streptanthus glandulosus John Hanscom 1989-4-1 5 Colusa Salt canyon, n side of Salt Creek, ca. 5 yds. n of Hwy 20, 11 mi wsw of Williams. 143 Comment
  HSC45730  Streptanthus glandulosus M. Alcasas 1978-4-22 41 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  CHSC71110  Streptanthus glandulosus subsp. glandulosus Jan Monelo 1989-4-1 4 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. 143 Comment
  UCD167945  Streptanthus morrisonii James Neilson 1982-7-1 4089 Colusa About 6 miles west of Lodoga, about 1 mile south of mouth of Frenzel Creek. (Exact location unknown. Coordinates estimated by label maker.) Comment
  SEINET11993694  Streptanthus morrisonii Unknown 1984-1 RR 40260 Colusa W of Ladoga, Goat Mt Rd, along Little Stonyford Cr (ca 0.3 mi W of rd origin at Ladoga-Stonyford Rd) 442 Comment
  UCR71158  Streptanthus morrisonii subsp. morrisonii L. F. LaPre 1986-5-30 s.n. Colusa Bartlet Springs Rd. 0.3 mi east of Lake Co. line 622 Comment
  SBBG83456  Styrax redivivus C. C. Shock 1980-5-3 68 Colusa 2 mi W of base of Bear Valley, 14.6 mi N of St Hwy 20, E of Walker Ridge 487 Comment
  UCD66531  Styrax redivivus Craig D. Thomsen 2000-4-28 2231 Colusa Bear Creek Botanic