Search Results — 2000 specimen records retrieved (1624 records with coordinates)
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 Please cite data retrieved from this page: Data provided by the participants of the Consortium of California Herbaria (ucjeps.berkeley.edu/consortium/).
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? Specimen ID Determination * Collector Collection Date Collection Number County Locality Elevation in meters Feedback
  IRVC29682  Abies magnifica var. shastensis Mark A. Elvin, Mark S. Brunell, David Isle 2006-8-3 5036 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
  CHSC80223  Abutilon theophrasti B. Castro; G. Kuenster 2000-7-19 1200 Colusa Vicinity of Maxwell, Golden Gate in Logan Ridge, Funks Creek, and the Glenn-Colusa canal, at edge of a levee road along an un-named drainage through agricultural land. 42 Comment
  UCR201545  Abutilon theophrasti George K. Helmkamp, E. A. Helmkamp 2008-10-14 14263 Colusa Sacramento Valley, along River Road (generally following the Sacramento River), 8.4 miles north of Colusa 17 Comment
  CAS-BOT-BC334176  Acer negundo var. californicum Roxana S. Ferris 1926-4-22 6301 Colusa near Sycamore Comment
  CHSC100410  Acer negundo var. californicum John Dittes; Josephine Guardino 2008-3-14 1511 Colusa Great Central Valley; Sacramento Valley; between Butte Sink and Sacramento River, north of Sutter Buttes; ca. 1.6 air-miles south of Gridley Road, ca. 1.1 air-miles west of Drumheller Slough. 17 Comment
  CAS-BOT-BC334174  Acer negundo var. californicum Alice Eastwood 1921-4-11 10245 Colusa Colusa Comment
  CAS-BOT-BC21710  Achillea millefolium Roxana S. Ferris 1917-4-14 586 Colusa 5 mi. west of Arbuckle Comment
  HSC45700  Achillea millefolium Sheila Logan 1978-4-22 62 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 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
  SEINET223541 Image available Achnatherum lemmonii L. R. Heckard 1972-7-10 3135 Colusa West of Trout Creek Snow Mt. 1829 Comment
  JEPS75746  Achnatherum occidentale subsp. californicum L. R. Heckard 1974-9-11 3945 Colusa e of Foutch Camp; Snow Mt., Trout Creek 1889 Comment
  HSC45717  Achyrachaena mollis Sheila Logan 1978-4-22 60 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  HSC87056  Achyrachaena mollis P. A. Daly, Rudy Galindo 1988-4-17 56 Colusa 5.2 miles south of Bear Valley Road 390 Comment
  RSA424744  Achyrachaena mollis Aaron Liston, M. A. Blumler 1987-4-26 667 -10 Colusa Bear Valley - Lodoga Road, 6.6 miles S of Bartlett Springs Jct. Comment
  UC88433  Achyrachaena mollis Brandegee 1900-1 Colusa Colusa Junction Comment
  UCD163687  Achyrachaena mollis Craig Thomsen 1999-4-15 1989 Colusa Bear Valley. About 5 miles north of Hwy 20, west of Bear Valley Rd. Comment
  CHSC30000  Acmispon brachycarpus John Griffith 1980-4-6 9 Colusa Ca. 6 mi s of Stonyford. 405 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
  UCD163235  Acmispon brachycarpus Craig D. Thomsen 2000-4-28 2250 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 1 mile west of Hwy 20/16 intersection. 345 Comment
  UCD63918  Acmispon brachycarpus Craig D. Thomsen 2001-5-24 2508 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection (between Colusa Co. mileposts 2.17 and 2.25). 342 Comment
  CHSC101628  Acmispon denticulatus David W. Isle; Teal Richards 2002-4-18 1653 Colusa Mendocino National Forest; N of Fouts Springs, S of Chlorinator Building on road to Bathhouse Trail (Snow Mtn.) SE aspect drainage in chamise chamassal site burned during 8/8/01 Trough Fire. Teal Richards-DI Reveg Study Plot. MDB and M. 524 Comment
  UCD66697  Acmispon denticulatus Craig D. Thomsen 2000-6-23 2385 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
  UCD67009  Acmispon denticulatus Craig D. Thomsen 2008-5-18 2736 Colusa BLM Payne Ranch. Lands to the SW of Hwy 16/20 intersection. Just south of Hwy 20, about 1 mile west of Hwy 16/20 intersection. Above perennial drainage. 365 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
  UCR261742  Acmispon rubriflorus Ann Howald 2003-6-9 2368 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3 miles north of Lodoga, near Hole-in-the-Wall camping area 370 Comment
  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
  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
  CAS-BOT-BC29713  Acroptilon repens F. L. Shanks 1931-10-1 s.n. Colusa Mills Orchard, near Maxwell Comment
  CAS-BOT-BC29714  Acroptilon repens F. L. Shanks 1931-10-1 s.n. Colusa Mills Orchard, near Maxwell Comment
  CAS-BOT-BC133151  Adenostoma fasciculatum Roxana S. Ferris 1917-4-14 594 Colusa 5 mi west of Arbuckle along Sand Creek, Arbuckle - Rumsey Road Comment
  CAS-BOT-BC133152  Adenostoma fasciculatum Roxana Stinchfield 1916-6-18 304 Colusa College City Comment
  JEPS44792  Adenostoma fasciculatum Alice King June 1906 Colusa College City 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
  SEINET10866059  Adenostoma fasciculatum Katherine L. Morris 1973-6-6 Morris 390 Colusa Chaparral woodland and sparse oak, on hwy 20, 0.3 miles e of lake co line Comment
  CHSC112264  Adiantum jordanii Lowell Ahart 2013-5-1 18674 Colusa Inner North Coast Range. On the south side of the wash, north side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  CHSC114944  Adiantum jordanii Lowell Ahart 2015-4-1 19989 Colusa Northside of State Highway 20, 1/2 mile east of Lake County Line, 12 miles (air) east- northeast of Clear Lake (town), 17 miles (air) west of Williams. Chaparral. 520 Comment
  CHSC107152  Aegilops triuncialis L. P. Janeway; B. Castro 2011-5-19 10290 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. Upland area above a shallow swale that drains north into the marsh which is 5 m lower in elevation. 54 Comment
  CDA4027  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
  UCD104589  Aeschynomene rudis June McCaskill; with Jim Hill 1990-8-27 s.n. Colusa Colusa Co.; near Princeton in a rice field; Comment
  UCD104590  Aeschynomene rudis June McCaskill; with Jim Hill 1990-9-5 s.n. Colusa Colusa Co.; near Princeton in a rice field; Comment
  CAS-BOT-BC206880  Aesculus californica Roxana S. Ferris 1926-4-23 6450 Colusa On Grapevine Grade betwen Stony ford and and Sites. Comment
  UCD81226  Aesculus californica Ellen Dean; K. Mawdsley, B. Rice, G. Harrington, and J. Alderson 2009-5-6 5563 Colusa Payne Ranch, lands to the SW of the jct. of Hwys. 16 and 20. Destinella Flat area on the S side of Hwy. 20. Canyon to the south of Destanella Flat. 446 Comment
  JEPS83147  Ageratina occidentalis L. R. Heckard 1974-9-10 3887 Colusa stream of upper reaches Dark Hollow Creek; Snow Mt., East Peak 2011 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
  CHSC56745  Agoseris heterophylla Ginger S. Gough 1989-4-1 7 Colusa Ca. 0.48km W of jct of Hwys 20 and 16, S side of Bear Creek, ca. 29km SW of Williams. 322 Comment
  UCD64516  Agoseris heterophylla Craig D. Thomsen 2000-4-12 2102 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
  UCD82475  Agoseris heterophylla Craig Thomsen; G. Harrington 2009-5-12 2853 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  JEPS80135  Agoseris heterophylla var. heterophylla L. R. Heckard with J. Hickman 1980-7-2 5295 Colusa 10 mi w, just above Summit Spring entrance to Snow Mt. trail Stonyford; Lake County boundary 1630 Comment
  UCD92450  Agrostis Beecher Crampton 1958-5-19 4811 Colusa West of Lodoga. Little Stony Creek. Comment
  CHSC94532  Agrostis avenacea Lowell Ahart 2006-8-22 13227 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  RSA725021  Agrostis avenacea L. Ahart 2006-8-22 13227 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
  JEPS110433  Agrostis exarata Lowell Ahart 2006-8-9 13167 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  JEPS80443  Agrostis exarata L. R. Heckard and J. C. Hickman 1980-9-15 5420 Colusa w of Summit Springs; Snow Mt. 1554 Comment
  UCD163845  Agrostis exarata Craig D. Thomsen 2000-6-1 s.n. Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCSB63779  Agrostis exarata Oswald, Vernon; Ahart, Lowell 1998-7-15 Colusa Bartlett Springs Rd; 1.6 mi W of Bear Valley Rd; T15N R5W Sect 7 487 Comment
  CHSC94474  Agrostis viridis Lowell Ahart 2006-8-9 13159 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UCD66472  Aira caryophyllea Craig D. Thomsen 2001-4-24 2476 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  UCD82469  Aira caryophyllea Craig Thomsen; G. Harrington 2009-5-12 2846 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  UCR227338  Aira caryophyllea Craig D. Thomsen 2001-4-24 2476 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, south side of Hwy 20, c. 0.25 mi west of Hwy 20/16 intersection, near Colusa Co. milepost 3.0 310 Comment
  SEINET3917542  Aira caryophyllea Donald Spalinger 1974-5-4 47 Colusa St. John Mt. quad. North fork Campground on Stony Creek. 1600.; 0 Comment
  UCD66951  Alisma triviale Gordon Harrington 2008-6-16 s.n. Colusa BLM Payne Ranch. Lands to the SW of the jct of Hwys 20 and 16. Along Brophy Canyon Creek upstream of trail crossing. 457 Comment
  UCD57115  Allium Gordon Harrington; Diana Hickson 2007-4-7 0019 Colusa Colusa Co. Ca. BLM Payne Ranch, SW intersection of Hwy 16 and Hwy 20, approx. 1/2 m WNW of Roadkill Cafe. 463 Comment
  UCD82470  Allium Craig Thomsen; G. Harrington 2009-5-12 2847 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. About 100 yds south of road (ravine with spring below). 707 Comment
  CAS-BOT-BC131915  Allium Roger Raiche 1985-3-19 RR 50160 Colusa Colusa-Lake County line, Walker Ridge, 3.4 miles south of north end of Barrel Springs Campground on Walker Ridge Road 1036 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
  UCD141837  Allium cratericola L. K. Mann; M. D. Mann 1961-4-2 s.n. Colusa Bear Valley. 396 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
  UCD141802  Allium falcifolium Roman Gankin 1958-4-25 s.n. Colusa 4 miles west of Leesville, near head of Bear Valley, off road. 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-BC135889  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
  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
  HSC67119  Allium fimbriatum var. purdyi Dale McNeal 1980-4-26 2318 Colusa Above Bear Valley Rd., 1.4 mi. N of its junction with Hwy. 20 Comment
  POM215800  Allium fimbriatum var. purdyi David D. Keck 1933-5-30 2398 Colusa Colusa/Lake Co. Line west of Wilbur Springs Comment
  RSA161099  Allium fimbriatum var. purdyi Peter H. Raven 1962-5-31 17908 Colusa Highway 20, 2.5 miles east of Lake County Line Comment
  RSA296770  Allium fimbriatum var. purdyi Thomas W. Nelson, Jane P. Nelson 1978-4-29 3928 Colusa Along Bear Valley Rd. , 2 miles form jct with Hwy 20. 366 Comment
  UCD138535  Allium fimbriatum var. purdyi K. Esau 1934-5-5 s.n. Colusa Tahoe-Ukiah Highway, west of Williams. Comment
  UCD82740  Allium fimbriatum var. purdyi Craig Thomsen; G. Harrington 2009-5-14 2921 Colusa Colusa County on Walker Ridge: southeast of Methany flat. 579 Comment
  UCR80282  Allium fimbriatum var. purdyi Thomas W. Nelson, Jane P. Nelson 1978-4-29 3928 Colusa Along Bear Valley Road c. 2 mi from the junction w/ State Route 20. 366 Comment
  CHSC2060  Allium peninsulare D. Smith 1935-5-12 Colusa Stonyford hills. Comment
  CDA11415  Allium serra G. F. Hrusa, K. van Katwyk 1995-4-22 12136 Colusa Inner North Coast Ranges; S side of Leesville Rd. approx. 3 m. N of Hwy 20. Comment
  CHSC86119  Allium serra Jenny Marr; Caroline Warren 1998-5-4 Colusa Vicinity of Sites, Stone Corral Creek, and Antelope Valley. 106 Comment
  JEPS47562  Allium serra W. L. Jepson 1932-5-7 16262 Colusa valley 2 mi above Venado 304 Comment
  UC630432  Allium serra Annetta Carter 1938-5-7 1373 Colusa 4 mi n Rumsey; Inner North Coast Range, Comanche Hills 243 Comment
  CAS-BOT-BC475549  Allium serra James R. Shevock 1973-4-14 2551 Colusa Occasional along Leesville Road; Northern Coast Ranges Comment
  HSC103590  Allium serra Thomas W. Nelson, Jane Nelson 1981-4-16 6413 Colusa Along Bartlet Springs-Bear Valley Rd., ~ 100 yds. from Bear Valley 610 Comment
  HSC47565  Allium serra J. P. Smith, J. O. Sawyer 1978-4-29 9793 Colusa Bear Valley Rd., 5.9 mi. from its junction with Hwy. 20 366 Comment
  HSC71314  Allium serra Thomas W. Nelson, Jane P. Nelson 1979-4-11 4611 Colusa Along Leesville to SR 20 cutoff 5 mi. E of Leesville Comment
  UCD141801  Allium serra L. K. Mann 1960-4-10 s.n. Colusa along State Highway #16 at south end of Bear Valley. Comment
  UCD141823  Allium serra L. K. Mann; A. Saghir 1963-5-15 s.n. Colusa 1/2 mile east of Sites toward Maxwell. Comment
  UCD141829  Allium serra M. Yamaguchi; D. Hughes, D. G. Hunt 1965-4-29 s.n. Colusa along road 3.2 miles past junction of California 16 and 20, toward Rumsey, SW part of county. Comment
  CAS-BOT-BC230055  Allophyllum gilioides Ellen Dean; G. Harrington; C. Thomsen; Chiao-Yi Cheng; R. Wilmarth 2009-5-20 5675 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road 853 Comment
  CHSC36827  Allophyllum gilioides B. Castro 1982-3-27 3 Colusa On roadcut on n side of Hwy 20 at Salt Canyon, n side of Salt Ck, 11 mi wsw of Williams. 143 Comment
  UCD82489  Allophyllum gilioides Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5675 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 853 Comment
  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
  JEPS73496  Alnus incana subsp. tenuifolia L. R. Heckard 1972-7-10 3112 Colusa Trout Creek Snow Mt. (at crossing of trail to Box Springs (ca 10 mi w of Stonyford)) 1828 Comment
  JEPS75837  Alnus incana subsp. tenuifolia L. R. Heckard 1974-9-11 3942 Colusa e. Foutch Camp (near upper crossing of Trout Creek, Snow Mt.); Snow Mt. 1859 Comment
  JEPS80786  Alnus incana subsp. tenuifolia L. R. Heckard and J. C. Hickman 1981-7-30 5759 Colusa s.e. side Snow Mt. (Trout Creek); , Trout Creek 1584 Comment
  RSA714650  Alopecurus pratensis Daisie Huang 2006-4-15 6041501 Colusa Maxwell rest stop on I-5. 25 Comment
  CAS-BOT-BC137972  Alopecurus saccatus Roxana S. Ferris 1917-4-12 549 Colusa 4 miles east of Williams. 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
  CHSC112624  Amaranthus californicus Lowell Ahart 2013-10-1 19089 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
  CDA32033  Ambrosia psilostachya D. Isle, Rhonda Isle 2007-9-9 1624 Colusa Mendocino National Forest- North Coast Ranges Middle Fork Stony Creek Watershed; Stonyford Park at NW edge of Indian VA Elementary School; about 100 yds SE of Co. Rd 306 Stony Creek Bridge; about 1/4 mile S of Glenn Co. line. 0 Comment
  JEPS108783  Ambrosia psilostachya Lowell Ahart 2006-9-26 13350 Colusa Between the deep ditch and the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell 24 Comment
  POM50992  Ambrosia psilostachya Roxana Stinchfield 1916-7-8 376 Colusa Truck garden Stinchfield Ranch - Sycamore Slough. Comment
  CDA20509  Ambrosia psilostachya D. Isle 2004-11-17 DI 2 -04 Colusa Northwestern California; Just N of Stony Creek, N of Stonyford and S of the Glenn county line. 344 Comment
  UC75674  Ammannia coccinea Ray Schirber 1905-1 Colusa near Grimes (Sacramento Valley); Sacramento Valley 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
  CHSC30012  Amsinckia intermedia John Griffith 1980-4-16 1 Colusa Ca. 7 mi s of Stonyford. 402 Comment
  JEPS81300  Amsinckia intermedia L. R. Heckard and J. C. Hickman 1982-7-5 5914 Colusa slope below Summit Springs (s side Snow Mountain); Snow Mountain 1524 Comment
  CHSC117804  Amsinckia lunaris Jake Schweitzer 2010-4-1 Colusa Inner North Coast Rnages. On BLM parcel, approx. 265 m W of Walker Ridge Road (Bartlett Springs Rd on some maps) 120 m SE of Til Jones Spring. 853 Comment
  CHSC81225  Amsinckia lunaris L. P. Janeway; B. Castro 2001-4-18 7024 Colusa Vicinity of Grapevine Creek, Sites-Lodoga Road, and Scotties Spring. 274 Comment
  UC1093626  Amsinckia lunaris Francia Chisaki, Gene B. Newcomb 1958-4-1 1097 Colusa on road to Lodoga (0.7 mi nw of junction with Hwy 20) Comment
  UC1199518  Amsinckia lunaris Annetta Carter 1938-5-8 1385 Colusa 3 mi n Leesville (on Lodoga Road) Comment
  UCD80836  Amsinckia lunaris Ellen Dean; G. Harrington, J. Alderson, M. Bibbo, B. Rice 2009-3-25 5293 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. 366 Comment
  UCR206368  Amsinckia lunaris George K. Helmkamp, E. A. Helmkamp 2009-3-11 14368 Colusa Inner North Coast Range Foothills, along CA-20, 9.7 miles southwest of Williams, on the north side of Salt Creek 162 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
  UC1084529  Amsinckia lycopsoides Peter Kamb 1952-5-25 2291 Colusa 1 mi e Lake County line (on Hwy 20) Comment
  CAS-BOT-BC537220  Amsinckia menziesii George K. Helmkamp; E. A. Helmkamp 2011-4-1 17116 Colusa Western Sacramento Valley; along Maxwell Road 2.1 mi E of Maxwell, near Delevan Wildlife Refuge 22 Comment
  HSC94205  Amsinckia menziesii D. Haskamp, E. Sonnenblick, M. Taft 1995-4-1 13 Colusa On Bear Valley Rd., 1.2 mi. S of the junction with Brim Rd. 415 Comment
  UCD67070  Amsinckia menziesii Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5098 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western part of ranch along ridge trail at Cache Creek Canyon. Just south of junction with trail that leads east to Brophy Canyon and Thompson Creek. 494 Comment
  UC1178293  Amsinckia tessellata var. gloriosa Ray and Chisaki 1952-3-29 K 125 Colusa Cache Creek Comment
  CHSC101640  Ancistrocarphus filagineus David W. Isle 2002-4-18 1658 Colusa Mendocino National Forest. N of Fouts Springs, N of Chlorinator Building and road to Bathhouse Trailhead. Edge of E-flowing ephemeral drainage. MDB and M. In chamise site burned in 8/8/01 Trough Fire and part of Helicopter Hydromulch Study Plot. 524 Comment
  CHSC78593  Ancistrocarphus filagineus J. Marr; H. West, C. Warren, J. Lacey-Rickert, N. Wight 1998-4-14 Colusa Vicinity of Antelope Valley. 137 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
  CHSC76775  Androsace elongata subsp. acuta J. Marr; B. Hendrickson 1999-3-30 Colusa About 11 air miles W of Willows, vicinity of Squaw Flat and Logan Creek. 152 Comment
  CHSC86874  Androsace elongata subsp. acuta B. Castro 2003-4-1 1409 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek, on low N-facing cutbank of dirt road which contours along hillside. 280 Comment
  CHSC89861  Androsace elongata subsp. acuta B. Castro; L. P. Janeway 2001-4-18 1235 Colusa Vicinity of Grapevine Creek, Sites-Lodoga Road, and Scotties Spring. On low terrace just above riparian corridor paralleling dirt road adja-ent to perennial N-S-trending creek. 274 Comment
  JEPS91078  Androsace elongata subsp. acuta Dean W. Taylor 1992-4-16 12401 Colusa hillsides 0.4 mi due w from spillway into Little Stony Creek (Inner North Coast Ranges, East Park Reservoir); Inner North Coast Ranges, East Park Reservoir 411 Comment
  CHSC42571  Angelica tomentosa Vernon Oswald 1984-7-20 1612 Colusa Near the Lily Pond n of Letts Lake in the Mendocino Nat. Forest. 1280 Comment
  CHSC42572  Angelica tomentosa Vernon Oswald 1986-6-30 2178 Colusa Northwest side of Lily Pond near Letts Lake. 1188 Comment
  UCD163218  Anthemis cotula Craig D. Thomsen 2000-5-11 2325 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 0.3 mile west of Hwy 20/16 intersection. 345 Comment
  UCD164035  Anthriscus caucalis Amber Flores 2016-4-9 1 Colusa BLM Bear Creek Ranch (previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. Just west of Cowboy Camp on east side of Bear Creek. 312 Comment
  CHSC111700  Antirrhinum subcordatum David Isle; F. Thomas Griggs 1979-5-23 2064 Colusa Little Stony Creek Watershed. 1/5 mile W of Goat Mtn. Rd/Lodoga Rd. Jct. on N side of Goat Mtn. Rd. Near I-7 fire pre-attack triangular sign on T-post. (Just past Ruby King Mine and small eph. drainage that joins Little Stony Creek from N. 414 Comment
  RSA161328  Antirrhinum vexillocalyculatum subsp. breweri Peter H. Raven, Richard Snow 1959-9-11 14420 Colusa Openings in forest of Pinus ponderosa, Dark Hollow Creek. 1860 Comment
  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
  CHSC115753  Antirrhinum virga David Isle 2015-6-20 2155 Colusa 10S -0533810E, 435732N . North Coast Range: 3.75 miles W of Stonyford and 100 yds S of road 8N01; S of Bob Angulo mobile home; on E edge of old 4x4 road/firebreak in chaparral. 427 Comment
  UCD64506  Aphanes occidentalis Craig D. Thomsen 2000-3-31 2093 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  JEPS87723  Apiastrum angustifolium Vernon H. Oswald and Lowell Ahart 1994-3-23 6017 Colusa just w of bridge over Sullivan Creek (s of Stonyford, Goat Mountain Road); Goat Mountain Road 505 Comment
  UCD82387  Apiastrum angustifolium Craig Thomsen; G. Harrington 2009-5-12 2830 b Colusa Colusa County. Walker Ridge. South of spur road en route to Eaton Springs, about 1/2 mile east of Walker Ridge Rd. About 200 yds south of road (ravine with spring below). 822 Comment
  CHSC86964  Apocynum cannabinum B. Castro; Michelle Cedarborg 2003-5-1 1426 Colusa Vicinity of Logan Ridge, Sites Peak and Lurline Creek. By creek not far downstream of pond at creek headwaters 204 Comment
  JEPS80780  Arceuthobium abietinum L. R. Heckard and J. C. Hickman 1981-7-30 5753 Colusa se side of Snow Mountain, Trout Creek Trout Creek; Snow Mountain, Trout Creek 1600 Comment
  CHSC28034  Arceuthobium campylopodum J. D. Jokerst 1979-3-24 180 Colusa Comment
  CHSC83138  Arctostaphylos G. L. Webster 1989-5-6 7700 Colusa Near border with Lake Co., on crest of Walker Ridge, near Cold Springs Mt. Comment
  JEPS81346  Arctostaphylos L. R. Heckard and J. C. Hickman 1982-7-6 5943 Colusa about 1/2 mi ne Summit Springs (e of trail, s side of mt.); Snow Mt. 1645 Comment
  SEINET11989661  Arctostaphylos canescens R. A. DeMartile 1982-1 s.n. Colusa 10 mi from Ladoga on road between Ladoga & Goat Mountain lookout 701 Comment
  CAS-BOT-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
  UC1051740  Arctostaphylos canescens subsp. canescens Helen K. Sharsmith 1953-6-20 4296 Colusa n slope Goat Mountain; Inner North Coast Ranges, Mendocino National Forest 1828 Comment
  JEPS117095  Arctostaphylos canescens subsp. sonomensis Peter Warner 2010-5-16 153 Colusa Walker Ridge Road, ~18.4 km N of jct. with Hwy. 20, along E (Colusa Co.) side of road, scattered on slopes above Zimory Canyon to the west, Trout Creek to east, and adjacent slopes on both sides of road Comment
  RSA670065  Arctostaphylos canescens subsp. sonomensis G. L. Webster 1989-5-6 7700 Colusa Walker Ridge, near Cold Springs Mt. Near border with Lake County. 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
  SEINET11989688  Arctostaphylos manzanita R. A. DeMartile 1982-1 s.n. Colusa between Ladoga & Goat Mt. lookout 792 Comment
  CHSC92603  Arctostaphylos manzanita subsp. elegans D. Isle 2005-7-14 1153 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. In saddle of Board Camp Ridge on 17N10, SE of the Homesites about 1 mile. SE of Boardcamp gate at the junction with OHV Trail 06 and road 17N10. 1633 Comment
  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
  SD247411  Arctostaphylos manzanita subsp. manzanita Ann Howald 2003-3-11 2278 Colusa Inner North Coast Ranges: Indian Valley, east side of East Park Reservoir, peninsula ca. 2.2 miles north of Lodoga (Lodoga 7.5'Q) 365 Comment
  SEINET7258424  Arctostaphylos manzanita subsp. roofii R. R. Halse 2014-3-25 9034 Colusa Along the Bear Valley Road ca. 1.8 mi WNW of its junction with State Hwy. 20. 378 Comment
  SEINET7760675 Image available Arctostaphylos manzanita subsp. roofii Richard R. Halse 2014-3-25 9034 Colusa Along the Bear Valley Road ca. 1.8 mi WNW of its junction with State Hwy. 20. 378 Comment
  CAS-BOT-BC46195  Arctostaphylos stanfordiana Richard A. DeMartile 1982-10-10 s.n. Colusa Road between Ladoga and Goat Mountain Lookout. 914 Comment
  UCD163861  Arctostaphylos viscida Craig D. Thomsen 2001-5-31 2543 Colusa Bear Creek Canyon south of Sulphur Creek confluence. About 3 miles north of Hwy 20. Comment
  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
  CHSC62844  Arctostaphylos viscida subsp. pulchella Vernon H. Oswald 1994-3-23 6011 Colusa Frenzel Creek Research Natural Area on the S side of Little Stony Creek, in the section on the E side of Frenzel Creek, S of Stonyford. 518 Comment
  RSA589937  Arctostaphylos viscida subsp. viscida Michael A. Vincent, Robert Rhode, Karl Vincent 1996-3-30 7301 Colusa Along Brim Rd., 1.9 mi. W juct . Bear Valley Rd. Comment
  SBBG114895  Arctostaphylos viscida subsp. viscida C. Bornstein 1999-3-19 Colusa Brim Rd 396 Comment
Read comments
Dec 10 2014
  CAS-BOT-BC401743  Argemone munita subsp. rotundata L. Constance 1939-5-14 2490 Colusa 1 mile east of Mill Creek Ranger Station, Inner North Coast Ranges 548 Comment
  UCR119181  Aristida ternipes var. gentilis Beecher Crampton 1963-6-11 6851 Colusa Sacramento Valley, About 10 miles west of Williams on Leesville Road, Three Sisters Mountain area. 198 Comment
  CHSC86126  Aristida ternipes var. hamulosa Jenny Marr; Julie Cunningham, Heidi West, Caroline Warren 1998-5-27 Colusa Vicinity of Antelope Valley, Antelope Creek, and Huffmaster Road. 137 Comment
  UC650323  Aristida ternipes var. hamulosa Paul Pattengale 1940-12-17 Colusa approximately 12 mi w Williams Comment
  CAS-BOT-BC400399  Aristolochia californica Roxana S. Ferris 1926-4-22 6308 Colusa Sycamore Slough near Sycamore Comment
  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
  UC71769  Artemisia douglasiana H. P. Chandler 1905-9-14 Colusa Princeton Comment
  UC1609127  Arthrocnemum subterminale Vernon H. Oswald, Mike Wolder and Joe Silveira 1993-7-26 5704 Colusa National Wildlife Refuge. Tract 7, just SW of the headquarters complex on O'Hair Rd, ca 2 mi SW of Colusa. 12 Comment
  UC1299578  Asclepias cordifolia Freed W. Hoffman 1947-6-19 1671 Colusa Cooks Springs North Coast Ranges Comment
  UCD121262  Asclepias cordifolia Jack Major 1966-6-6 s.n. Colusa At junction of Frenzel Creek with Stony Creek. 426 Comment
  CHSC60872  Asclepias fascicularis Vernon H. Oswald 1993-6-23 5573 Colusa Sacramento National Wildlife Refuge. Refuge located ca. 7 mi S of Willows, along the NE edge of Tract 41. 22 Comment
  UCD121317  Asclepias fascicularis V. C. Bryant 1926-6-8 s.n. Colusa Colusa. Comment
  UCD72531  Asclepias fascicularis Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3822 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. West side of Bear Creek, ca. 0.5 mile downstream of bridge. 246 Comment
  JEPS80258  Asclepias fascicularis L. R. Heckard and J. Hickman 1980-9-15 5437 Colusa Summit Springs, n of road Snow Mt., Lake-Colusa County Boundary 1524 Comment
  UCD121316  Asclepias fascicularis Roy Y. Berg 1964-6-27 RYB 8179 Colusa Stonyford. Comment
  UCR270712  Asclepias solanoana John F. Emmel 2002-7-30 1775 Colusa North Coast Range, Summit Springs area, south of Snow Mountain, 0.3-0.4 air mile NE of Summit Spring 1616 Comment
  JEPS82548  Asclepias speciosa L. R. Heckard 1983-7-27 6111 Colusa slopes around Summit Springs (s flank of Snow Mt.); Snow Mt. Comment
  UC1051712  Asclepias speciosa Helen K. Sharsmith 1953-6-19 4262 Colusa near confluence of North and Middle Forks of Stoney Creek (Red Bridge Camp); Inner North Coast Ranges, Mendocino National Forest 548 Comment
  JEPS80758  Asclepias speciosa L. R. Heckard and J. C. Hickman 1981-7-29 5725 Colusa above Summit Springs (s side of mountain); Snow Mt., Colusa-Lake County Boundary 1554 Comment
  CAS-BOT-BC478060  Asteraceae Mark A. Elvin; Mark S. Brunell; David Isle 2006-8-3 5035 Colusa Southern Northern Inner Coast Ranges, Snow Mountain, Summit Spring Trail, 1.4 km W of Snow Mtn West summit, 800 m N of Cedar Camp 1988 Comment
  UC1049537  Astragalus breweri Rimo Bacigalupi 1950-4-16 3112 Colusa four mi s Ladoga (6 mi nnw of Leesville, in Indian Valley (not the one in Lake County) along Little Indian Creek, eastern base of Inner North Coast Ranges); eastern base Inner North Coast Ranges, Little Indian Creek 396 Comment
  SEINET3142827  Astragalus clevelandii Unknown 1985-6-19 sn Colusa Just SW of Bear Valley, on ridge NW of Wilbur Hot Spring ca 2 air mi. Comment
  UCD64032  Astragalus clevelandii Craig D. Thomsen 2000-6-23 2411 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
  HSC72171  Astragalus gambelianus Thomas W. Nelson, Jane P. Nelson 1978-4-2 9548 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  SEINET7096743  Astragalus gambelianus A. G. Vestal 1955-4-5 3673 Colusa Steep south of facing bank ca. 1/3 mile into Colusa National Wildlife Refuge on Route 20.NAD27, 39? deg. 09' 09ao, -122?_ 11ao (converted to WGS84 decimal degrees) UTM Zone 10, 570301mE, 4333799mN. Comment
  UCD169698  Astragalus gambelianus Richard R. Halse 2013-3-27 8765 Colusa Along Highway 20 just east of the Colusa/Lake County Line ca. 14.6 miles east of the junction of State Highways 20 and 53. 558 Comment
  CAS-BOT-BC193115  Astragalus rattanii var. jepsonianus Alice Eastwood; John Thomas Howell 1938-5-16 5634 Colusa Lake - Colusa Co. line on road to Williams Comment
  CHSC26305  Astragalus rattanii var. jepsonianus Pauleen Broyles 1977-4-16 119 Colusa Ca. .5 km w of Hwys 20 and 16, s side of Bear Creek, ca. 30 km sw of Williams. 316 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
  UC1181547  Astragalus rattanii var. jepsonianus R. F. Hoover 1941-5-2 4986 Colusa on Williams--Clear Lake Highway just e Lake Co. line; Williams--Clear Lake Highway Comment
  UCD163214  Astragalus rattanii var. jepsonianus Craig D. Thomsen 2000-4-28 2254 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
  UCD56928  Astragalus rattanii var. jepsonianus Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3531 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Saddle between Craig and Thompson Canyons. 394 Comment
  UCD57293  Astragalus rattanii var. jepsonianus Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3664 Colusa BLM Payne Ranch. Near origin of Craig Canyon. West of Hwy. 16, ca. 2 road miles south of junction of Hwy. 20 and Hwy. 16. 359 Comment
  UCD63032  Astragalus rattanii var. jepsonianus Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4684 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Along west side of Bear Creek, just north of Eula Canyon. 312 Comment
  UCD66446  Astragalus rattanii var. jepsonianus Craig D. Thomsen 2000-5-11 2291 -b Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  UC82603  Astragalus tener var. ferrisiae Katharine Brandegee May 1884 Colusa Mountain House (=Mountain Home road sta.) Comment
Read comments
Feb 28 2006
  CAS-BOT-BC17401  Athysanus pusillus Roxana S. Ferris 1917-4-14 551 Colusa Foothills 7 miles west of Arbuckle. Arbuckle-Rumsey Road. Comment
  UCD58109  Athysanus pusillus Ellen Dean; G. Harrington and P. McIntyre 2007-3-16 3361 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. Grassland area to the SSE of Destanella Flat. 572 Comment
  UCD64044  Athysanus pusillus Craig D. Thomsen 2000-3-8 2036 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
  CAS-BOT-BC17403  Athysanus pusillus Volney Rattan 1884-1-1 s.n. Colusa Unspecified. Comment
  UCD63023  Athysanus unilateralis Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4675 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
  UCR225263  Atriplex Craig D. Thomsen 2008-4-27 s.n. Colusa BLM Payne Ranch, lands to the southwest of the intersection of Hwys 20 and 16. Southwest of Cowboy Camp on the west side of Bear Creek 366 Comment
  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
  JEPS59519  Atriplex argentea var. mohavensis W. L. Jepson 1929-9-26 15274 Colusa Maxwell 25 Comment
  JEPS59412  Atriplex argentea var. mohavensis W. L. Jepson 1924-10-27 10661 Colusa Alkali goose lands near Maxwell; near Maxwell Comment
  UC1609126  Atriplex coronata Vernon H. Oswald, Mike Wolder and Joe Silveira 1993-7-26 5701 Colusa ca 5 mi s Colusa (ca 1 mi n of Ware Rd., ca 1 mi w of Ohm Rd., Tract 18 on the s side of the Colusa National Wildlife Refuge); s side Colusa National Wildlife Refuge, s of Colusa 15 Comment
  JEPS90596  Atriplex depressa Dean W. Taylor 1993-8-31 14069 Colusa dry vernal pool ca 200 mi e North Fork Logan Creek (Logandale 7 1/2' USGS quadrangle); Sacramento Valley, Sacramento National Wildlife Refuge 24 Comment
  CHSC79494  Atriplex fruticulosa L. P. Janeway; B. Castro 2000-3-23 6637 A Colusa Vicinity of Funks Creek and Glenn-Colusa Canal. 47 Comment
  CHSC80184  Atriplex joaquinana B. Castro; G. Kuenster 2000-7-19 1210 Colusa Vicinity of Maxwell, Funks Creek, and the Glenn-Colusa canal, on low terrace beside S edge of shallow ephmeral stream channel draining eastward out of the hills east of Golden Gate. 54 Comment
  CHSC83634  Atriplex joaquinana L. P. Janeway 2002-4-25 7526 Colusa Sacramento Valley. Vicinity of Funks Creek and Tehama-Colusa Canal. Drainage bottoms. 51 Comment
  UCD97461  Atriplex joaquinana A. A. Heller 1916-6-9 12394 Colusa near Williams. Comment
  JEPS90603  Atriplex rosea Dean W. Taylor 1989-8-4 10422 Colusa Colusa National Wildlife Refuge Great Central Valley (along Ohm Road) 39 Comment
  CHSC78973  Atriplex triangularis Vernon H. Oswald; Joseph G. Silveira 2000-10-12 9977 Colusa Delevan National Wildlife Refuge. 18 Comment
  HSC45723  Avena barbata Catherine Chin 1978-4-22 27 Colusa Bear Valley Rd., 1.5 miles from its junction with State Rte. 20 412 Comment
  UCD57056  Avena barbata Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3644 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
  SEINET3919645  Avena barbata Patricia Shesgreen 1978-4-22 33 Colusa Wilbur Springs Quad. Bear Valley Road, 1.5 miles from its junction with State Route 20.; 0 411 Comment
  UCD56362  Avena fatua Beecher Crampton 1962-4-17 6213 Colusa Sycamore. Comment
  CHSC46039  Azolla microphylla Lowell Ahart 1975-1-25 699 Colusa On the south side of Norman Road, about 1 mile west of Princeton. 30 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
  SBBG119875  Bassia hyssopifolia L. Ahart 2003-8-15 10509 Colusa S side of St Hwy 20, ca. 1 mi SW of Williams 27 Comment
  UCD97545  Bassia hyssopifolia Beecher Crampton 1963-8-3 6868 Colusa 1/4 mile east of Cortena. Comment
  UCD97560  Bassia hyssopifolia P. B. Kennedy 1928-9-15 s.n. Colusa Cortena. Comment
  JEPS18813  Blennosperma nanum var. nanum Ruth Johnson 1915-4-6 Colusa College City Comment
  JEPS15272  Boechera breweri subsp. shastaensis Rimo Bacigalupi G. L. Stebbins and Peter Kamb 1950-4-16 3106 Colusa ridge n Red Bridge Camp (between and above the confluence of the N and Middle Forks of Stony Creek, nw Colusa Co., very close to Glenn Co. line); Inner North Coast Ranges, Mendocino National Forest 579 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
  RSA0046899  Bolboschoenus glaucus Richard Carter 2006-7-31 17122 Colusa 3.7 mi SSE Colusa, jct. Hwy CA 20 and Hwy CA 45. Comment
  UCD18527  Bolboschoenus glaucus June McCaskill; with Mr. Harvey and Loren Davis 1954-8-9 361 Colusa ca. 2 mi. east of Princeton and 400 yds. south of Glenn County line. Comment
  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
  CDA16108  Brickellia californica G. F. Hrusa, Dmitri Geltman (LE) 1999-8-18 15245 Colusa North Coast Ranges; Along Leesville Rd. 365 Comment
  JEPS108909  Brickellia californica Lowell Ahart 2006-8-9 13110 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford 422 Comment
  SEINET9368833  Brickellia californica Unknown 1999-8-18 15245 Colusa Colusa Comment
  JEPS80803  Brickellia grandiflora L. R. Heckard and J. C. Hickman 1981-7-30 5773 A Colusa at e summit of ridge running e of (about 1.7 km. air miles from) West Peak (Snow Mt); Snow Mt. 2042 Comment
  UCD72482  Brodiaea elegans subsp. elegans Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3816 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
  HSC3023  Brodiaea elegans subsp. elegans Annetta Carter 1953-6-20 3240 Colusa Near summit E of Hough Springs on Bartlett Springs Rd. Comment
  HSC45669  Bromus arenarius Stephen Plant 1978-4-22 204 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 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
  UCR119114  Bromus arenarius Beecher Crampton 1958-4-21 4733 Colusa Inner North Coast Ranges, 12 miles northwest of Rumsey, along Highway 16. 381 Comment
  UCD59156  Bromus carinatus var. marginatus Beecher Crampton 1958-5-19 4800 Colusa 5.8 miles south of Lodoga. Comment
  UCD66931  Bromus caroli-henrici Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5080 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Northwestern part of ranch, along ridge trail on border of Lake and Colusa Counties. South of junction with trail that heads down to the headwaters of Thompson Creek. 633 Comment
  CHSC117405  Bromus catharticus B. Castro; Tom Boullion 2008-7-10 1765 Colusa Sacramento Valley. Ca 3 air mi SE of Colusa, on W bank of the Sacramento River near Moon Bend Rd. at RM 141.4, just off Moon Bend Rd. 18 Comment
  SEINET3922244  Bromus diandrus S. Bowie, J. Lopez; D. Riess 1994-4-23 171 Colusa Leesville Quadrangle, Walker Ridge (BLM property). Collected along Bear Valley Road in Bear Valley, approx. 2.1 km south of intersection with Brimm Road.; 0 663 Comment
  CAS-BOT-BC155496  Bromus hordeaceus Roxana S. Ferris 1917-4-12 527 Colusa 4 miles east of Williams. Comment
  UCD57554  Bromus hordeaceus Cindy Yip; 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. 304 Comment
  POM92520  Bromus hordeaceus Roxana S. Ferris 1917-04 527 Colusa 4 miles east of Williams. Comment
  SEINET10514562  Bromus hordeaceus Roxana S. Ferris 1917-4-12 Ferris 527 Colusa 4 miles E of Williams. Alkali Plains. Comment
  CHSC100264  Bromus laevipes D. Isle 1988-4-13 1512 Colusa Mendocino National Forest - North Coast Ranges. Middle Fork Stony Creek Watershed. Mellow-D Ranch meadow just north of 1st bad erosion channel in area burned during 1987 Fouts Fire. 731 Comment
  CHSC71012  Bromus laevipes Vernon Oswald; Lowell Ahart 1998-5-7 8997 Colusa On a roadside bank. 487 Comment
  CHSC86613  Bromus madritensis subsp. rubens Jenny Marr; Heidi West, Joyce Lacey, Caroline Warren, N. Wight 1998-4-14 Colusa Vicinity of Grapevine Creek, Antelope Valley, and Sites-Lodoga Road. 121 Comment
  JEPS80793  Bromus orcuttianus L. R. Heckard and J. C. Hickman 1981-7-30 5763 Colusa se Snow Mountain, going down Trout Creek Trout Creek; Snow Mountain, Trout Creek 1569 Comment
  JEPS110259  Bromus pseudolaevipes Lowell Ahart 2006-6-11 12670 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
  UCD58602  Bromus pseudolaevipes Beecher Crampton 1958-5-19 4814 Colusa Above Little Stony Creek. West of Lodoga. Comment
  SEINET3923292  Bromus rubens Christopher Knopp 1978-4-22 17 Colusa Wilbur Springs Quad. Bear Valley Road 1.5 miles from its junction with State Route 20.; 0 411 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
  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
  RSA141301  Cacaliopsis nardosmia J. M. Tucker, John Tothill 1959-5-30 3527 Colusa Road between Goat Mountain Lookout and Upper Letts Valley (ca. 2.5 miles, airline, north of the lookout), Goat Mountain. 1448 Comment
  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
  UCD169351  Calandrinia breweri Lowell Ahart 2013-5-1 18673 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. 566 Comment
  JEPS52594  Calandrinia ciliata Ruth Johnson 1915-4-6 Colusa College City Comment
  UCD163910  Calandrinia ciliata Sara Martin 2016-4-9 3 Colusa BLM Bear Creek Ranch (Previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. Southwest of corral at junction of 16 and 20, junction of meadow and hill. 325 Comment
  UCD57308  Calandrinia ciliata Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3679 Colusa BLM Payne Ranch. Lands to the southwest of junction of Hwy. 20 and Hwy. 16. Thompson Canyon, near juncture with Craig Canyon. 362 Comment
  UCD64251  Calandrinia ciliata Craig D. Thomsen 2000-3-31 2053 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
  HSC72115  Calandrinia ciliata J. P. Smith, Jane P. Nelson, Thomas W. Nelson 1978-4-2 9530 Colusa Bear Valley Rd., 5 mi. from its junction with Hwy. 20 390 Comment
  UCD100196  Calandrinia ciliata Mark Hershkovitz 1991-5-3 s.n. Colusa Walker Ridge, along Walker Ridge Rd. nr. Turn-off to Bear Valley on north end; serpentine. Comment
  UCD103570  California macrophylla Craig Thomsen 2011-3-28 s.n. Colusa BLM Bear Creek (formerly Payne) Ranch. W of intersection of Hwys 16 and 20; E side of 'Serpentine Creek.' Drainage runs north from Bear Creek Ranch flowing under pull out along Hwy 20. 335 Comment
  UCD57817  California macrophylla Gordon Harrington 2007-3-22 1 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central part of ranch. 472 Comment
  NY465060  Callitriche marginata A. A. Heller 1902-5-2 5440 Colusa Princeton Comment
  RSA135689  Callitriche marginata A. A. Heller, H. E. Brown 1902-5-2 9382 Colusa Princeton. Comment
  JEPS80389  Calocedrus decurrens L. R. Heckard and J. Hickman 1981-6-22 5622 Colusa at edge Veratrum meadow; Snow Mt., Dark Hollow Creek, Big Meadow, Veratrum meadow 1889 Comment
  CHSC79618  Calochortus amabilis B. Castro; L. P. Janeway 2000-5-3 1126 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 313 Comment
  JEPS122382  Calochortus amabilis Nisrine Machaka-Houri with Gracie Benson-Martin 2014-5-3 NG 2 Colusa Bear Valley Road 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
  JEPS61681  Calochortus luteus W. L. Jepson 1920-5-23 8969 Colusa 2-3 mi sw Leewville (at foot of Bartlett grade, w side of Bear Valley); Bear Valley, Bartlett Grade 426 Comment
  JEPS61682  Calochortus luteus Alice King May 1906 Colusa College City Comment
  UC1733772  Calochortus luteus Kay H. Beach 1940-5-16 659 Colusa Colusa and Lake county line Comment
  UCD139532  Calochortus luteus K. Esau 1934-5-6 s.n. Colusa West of Williams, Ukiah-Tahoe Highway. Comment
  CAS-BOT-BC483486  Calochortus splendens Greg de Nevers; S. Charnley 1995-5-27 10735 Colusa Snow Mountain 914 Comment
  CHSC80106  Calochortus splendens L. P. Janeway; Joyce Lacey-Rickert 2000-6-1 6779 Colusa Vicinity of Grapevine Creek, Scotties Canyon, and Rena Canyon. 243 Comment
  UC1562881  Calochortus splendens Barbara Ertter 1989-7-1 8600 Colusa ca 12 air mi wsw Stonyford (road to Goat Mt Lookout, 2.2 mi s of Rt M-10 (Bear Creek-Fouts Spring Rd), at head of South Fork Stony Creek, s.w. side of ridge); South Fork Stony Creek 1500 Comment
  UCD146722  Calochortus splendens G. F. Hrusa 1998-6-19 14612 Colusa above upper Little Stony Creek. Goat Mountain Road around 1.5 km west of campground. 485 Comment
  CAS-BOT-BC483484  Calochortus splendens Volney Rattan 1884-6-1 s.n. Colusa Above Fouts Springs, Coast Mts. north of San Francisco Bay Comment
  JEPS80134  Calochortus tolmiei L. R. Heckard with J. Hickman 1980-7-2 5294 Colusa ca 10 mi w Stonyford (just above (ne of) Summit Springs, sw of Snow Mt. peaks, Colusa-Lake County boundary) 1584 Comment
  CAS-BOT-BC132571  Calochortus uniflorus Wayne Roderick 1967-5-7 s.n. Colusa Bear Valley nr. Leesville 304 Comment
  CHSC42778  Calochortus uniflorus Deborah Grobman 1975-5-11 13 Colusa 3.6 miles east of Leesville on Leesville Grade. Comment
  JEPS39672  Calochortus uniflorus Rimo Bacigalupi, T. Crovello and L. Heckard 1965-4-26 9045 Colusa 4.0 mi s point where road takes off w to Bartlett Springs; Bear Valley Comment
  RSA304209  Calochortus uniflorus James R. Shevock 1972-3-25 1449 Colusa Bear Valley. 396 Comment
  SEINET8369630  Calochortus uniflorus Christine C. Lorain 1993-4-20 2235 Colusa 7.1 mi s of Leesville alogn Bear Valley Road near shart 90o turn in road (cattle yard). 427 Comment
  HSC65993  Calochortus vestae D. Boyd, M. Eichelberger, Tim Messick, Tom Ranker 1980-4-20 46 Colusa Leesville Rd. from Leesville to Williams, 3.8 mi. E of Leesville. Comment
  UCD63912  Calycadenia fremontii Craig D. Thomsen 2000-6-23 2401 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection (between Colusa Co. mileposts 2.17 and 2.25). 342 Comment
  UCR212336  Calycadenia fremontii Craig D. Thomsen 2000-6-23 2401 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, south side of Hwy 20, c. 0.5 mi west of Hwy 20/16 intersection (between mileposts 2.17 and 2.25). 342 Comment
  UC1876638  Calycadenia pauciflora Gerald D. Carr 1972-6-14 703 Colusa At the Lake Co. line on Hwy 20. Comment
  UCD66946  Calycadenia pauciflora Ellen Dean; Davis Botanical Society 2008-5-31 4992 Colusa west of I-5 at Maxwell, along Goat Mountain Road, immediately west of the junction with Lodoga-Stonyford Road. 382 Comment
  UCD70217  Calycadenia pauciflora D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. Serpentine annual grasslands in serpentine chaparral edges. 370 Comment
  UCR200665  Calycadenia pauciflora Craig D. Thomsen 2008-5-23 2737 Colusa BLM Payne Ranch, southwest of intersection between Hwy 16 and Hwy 20, 0.5 mile south of Hwy 20 (south of Destanella Flat), c. 2.5 miles west of Hwy 16 542 Comment
  UCR261752  Calycadenia pauciflora Ann Howald 2003-5-29 2351 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3.7 miles north of Lodoga, near Chisolm Cove Group Campground 378 Comment
  CAS-BOT-BC270743  Calycadenia pauciflora Gerald D. Carr 1972-7-29 717 Colusa 8.7 miles N of Highway 20 on Bear Valley Road, along banks of Bear Creek Comment
  CAS-BOT-BC270749  Calycadenia pauciflora Gerald D. Carr 1971-7-29 607 Colusa 5.2 miles N of Stoneyford on road to Fout Springs 609 Comment
  CAS-BOT-BC270754  Calycadenia pauciflora Gerald D. Carr 1971-9-14 652 Colusa 3.6 miles SW of Leesville on Bartlett Springs Road 518 Comment
  CAS-BOT-BC270756  Calycadenia pauciflora H. M. Hall 1930-10-3 12936 Colusa 2 miles S of Stoneyford 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
  UC1876227  Calycadenia pauciflora Gerald D. Carr 1972-7-29 717 Colusa 8.7 mi N of Hwy 20 on Bear Valley Rd., along banks of Bear Cr. Comment
  UC1876245  Calycadenia pauciflora Gerald D. Carr 1972-7-29 721 Colusa 3.1 mi S of Bartlett Springs Rd. on Walker Ridge Rd., Buck Flat. 868 Comment
  UC1876261  Calycadenia pauciflora Gerald D. Carr 1971-7-29 606 Colusa On road to Trout Cr. Trail, 0.5 mi NW of driveway to Fout Spr. Boys Ranch 502 Comment
  UC1876262  Calycadenia pauciflora Gerald D. Carr 1971-7-23 605 Colusa 1.7 mi W of Lodoga on road to Stoneyford. 411 Comment
  UCD129806  Calycadenia pauciflora Gerald D. Carr 1971-7-29 607 Colusa 5.2 miles west of Stoneyford on road to Fout Spr. 609 Comment
  UCD129807  Calycadenia pauciflora Gerald D. Carr 1971-7-29 608 Colusa 1 miles south of Stoneyford on road to Lodoga. 365 Comment
  UCD129870  Calycadenia pauciflora R. L. Carr 1978-8-20 2155 Colusa Brim Road (to Bartlett Spring), 1.5 miles west of junction with Bear Valley Road, around 3.6 miles southwest of Leesville. 482 Comment
  UCD129891  Calycadenia pauciflora Gerald D. Carr 1971-9-14 651 Colusa 2.0 miles southwest o Leesville on road to Bartlett Springs. 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
  UCD67591  Calycanthus occidentalis Charles Martin 1986-5-17 29 Colusa Along Fouts Spring Rd., 2.8 miles W of Stonyford, along roadside. Growing along small stream, soil dry. Large shrub, ca. 10 ft tall, flowers large, reddish. Comment
  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
  UCD63111  Calystegia collina subsp. collina Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4942 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
  RSA0059895  Calystegia collina subsp. collina Gloria R. Campbell 1948-6-18 653 Colusa 2 miles west of junction of Highways 16 and 20. Comment
  UCSB4973  Calystegia occidentalis Keator, Glenn 1958-6-16 Colusa Foothills west of Bartlett Springs Comment
  UCD81718  Calystegia occidentalis subsp. occidentalis Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5723 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
  CHSC79775  Camissonia contorta L. P. Janeway; B. Castro 2000-5-4 6704 Colusa Vicinity of Grapevine Creek and Sites-Lodoga Road. 262 Comment
  HSC45729  Camissonia ignota Mark Flippo 1978-4-22 15 Colusa Bear Valley Rd., 1.5 mi. from its jct. with Hwy. 20 412 Comment
  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
  UCD56906  Capsella bursa-pastoris Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3509 Colusa BLM Payne Ranch. In Craig Canyon. Southwest of intersection of Hwy. 16 and Hwy. 20. 326 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
  UCR238927  Capsella bursa-pastoris George K. Helmkamp, E. A. Helmkamp 2012-2-9 18532 Colusa Sacramento Valley, River Road, 7.1 miles north of Colusa; east side of Sacramento River 18 Comment
  UCD164043  Cardamine hirsuta Richard Philbrook 2016-4-9 1 Colusa BLM Bear Creek Ranch (Previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. Just west of Cowboy Camp on east side of Bear Creek. 312 Comment
  CHSC62923  Cardamine oligosperma Vernon H. Oswald; Lowell Ahart 1994-4-6 6056 Colusa Goat Mtn. Rd. 0.1 mi NE of Digger Pine Flat, S of Stonyford. On a roadside bank. 463 Comment
  UCD162983  Cardamine oligosperma Craig D. Thomsen 2002-2-7 2570 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
  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
  UCR200671  Cardaria draba Craig D. Thomsen 2008-4-7 2724 Colusa BLM Payne Ranch, southwest of intersection between Hwy 16 and Hwy 20, along entry road into Cowboy Camp from Hwy 16, 1 mile south of Hwy 20 Comment
  CDA6843  Carduus acanthoides G. D. Barbe, N. Palmer 1982-6-4 3639 Colusa 1.7 miles north of Pacific Ridge Forest Station, Mendocino National Forest. Comment
  CHSC107961  Carduus pycnocephalus B. Castro; Robin Carter, Jessica Boyt 2011-4-25 1848 Colusa Sacramento Valley. Extreme W edge of Sacramento Valley; 5 air mi NW of Maxwell, 0.6 mi southeast of Funks Reservoir and 130 ft east of Tehama-Colusa Canal. Ca 0.3 mi NW of large +- saline/alkaline wetland/marsh, next to large transmission-line towers. 54 Comment
  CDA33019  Carex angustata P. T. Zwanck 1964-4-28 Colusa 5 miles north of Colusa, on levee. 0 Comment
  CAS-BOT-BC19165  Carex barbarae Roxana S. Ferris 1926-4-22 6315 Colusa Near Sycamore. Comment
  UC596489  Carex barbarae R. F. Hoover 1938-4-23 3210 Colusa Upper Sand Creek 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
  JEPS80035  Carex densa L. R. Heckard and R. Bacigalupi 1976-9-6 4426 Colusa Along trail from Summit Springs to Fouts Camp, Snow Mountain. 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
  JEPS80383  Carex hoodii L. R. Heckard and J. Hickman 1981-6-22 5616 Colusa along Dark Hollow Creek Snow Mt., Dark Hollow Creek 1889 Comment
  JEPS80866  Carex hoodii L. R. Heckard and J. C. Hickman 1981-7-31 5778 Colusa near Fouts Springs Overlook (e side of Snow Mt.); Snow Mt. 1798 Comment
  JEPS75123  Carex jonesii L. R. Heckard 1974-9-10 3913 Colusa ne slope of West Peak Snow Mt., West Peak 2072 Comment
  CHSC76352  Carex klamathensis L. P. Janeway; B. Castro 1999-7-5 6497 Colusa At Bear Wallow Spring; on north side of Lovelady Ridge about 0.5 mi northeast of Pacific Point. 1045 Comment
  JEPS80275  Carex lenticularis var. impressa L. R. Heckard and J. Hickman 1980-9-16 5461 Colusa cirque area between peaks, ne slope of West Peak, Snow Mt. West Peak; Snow Mt., West Peak 2011 Comment
  JEPS75130  Carex luzulina var. luzulina L. R. Heckard 1972-7-8 3041 Colusa north side of ridge running southeast of Snow Mt., West Peak 2011 Comment
  JEPS80879  Carex luzulina var. luzulina L. R. Heckard and J. C. Hickman 1980-9-16 5456 Colusa Northeast slope of West Peak, cirque area between peaks, Snow Mt. 2011 Comment
  CDA12170  Carex nudata G. F. Hrusa 1993-5-2 10866 Colusa North Coast Ranges; USFS Frenzel Creek Research Natural Area.Little Stony Creek at confluence with Frenzel Creek. Comment
  CAS-BOT-BC119425  Carex obnupta Roxana S. Ferris 1917-4-15 607 Colusa Sycamore Slough. Comment
  JEPS80867  Carex pachystachya L. R. Heckard and J. C. Hickman 1981-7-31 5795 Colusa Dark Hollow Creek, e side of Snow Mt. Snow Mt., Dark Hollow Creek 1584 Comment
  UCD163311  Carex praegracilis Craig D. Thomsen 1997-4-13 1899 Colusa Bear Valley. About 6 miles north of Hwy 20. Southwest of old corral area (USGS Topo Map), where road takes a 90 degree turn to the north. Comment
  UCD163855  Carex praegracilis Craig D. Thomsen 2001-4-12 2472 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCD82620  Carex praegracilis Craig Thomsen; G. Harrington 2009-5-12 2889 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  RSA262496  Carex praegracilis Sam Olusuyi 1967-4-29 35 Colusa 9 miles north of junction of Wilbur Springs Road and State Highway 20, Bear Valley. 396 Comment
  CHSC79853  Carex serratodens L. P. Janeway 2000-5-31 6771 Colusa High North Coast Ranges. At Trough Spring; about 8.9 km southwest of Stonyford. 1049 Comment
  JEPS110261  Carex serratodens Lowell Ahart 2006-6-11 12669 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
  JEPS81328  Carex serratodens L. R. Heckard and J. C. Hickman 1982-7-6 5942 Colusa about 1/2 mi ne Summit Springs (e of trail, s side Snow Mt.); Snow Mt. 1645 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
  UCD83755  Carex serratodens Ellen Dean; G. Harrington, K. Mawdsley, J. Shepard 2010-5-1 5952 Colusa Colusa County. Walker Ridge. Along Walker Ridge Road, Buck Flat. 875 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
  HSC36255  Carex serratodens Steven Lagos 1974-5-4 48 Colusa 915 Comment
  JEPS75137  Carex subfusca L. R. Heckard 1972-7-8 3040 c Colusa n side of ridge running se Snow Mt., West Peak 2011 Comment
  JEPS80860  Carex subfusca L. R. Heckard and J. C. Hickman 1981-7-30 5740 Colusa along Trout Creek trail, se side of Snow Mt. Snow Mt., Trout Creek trail 1676 Comment
  CDA15498  Carex tumulicola G. F. Hrusa, T. D. Wilfred 1998-6-19 14635 Colusa North Coast Ranges; Near Goat Mtn. summit, adj. to intersection at Lake Co. boundary. NW side of summit area. Comment
  UCD23340  Castilleja A. M. Shapiro 2003-8-19 s.n. Colusa Little Stony Creek. Comment
  CAS-BOT-BC249071  Castilleja affinis Roxana S. Ferris 1917-4-19 574 Colusa 7 mi west of Arbuckle, Arbuckle - Rumsey Road Comment
  JEPS74811  Castilleja affinis subsp. affinis L. R. Heckard, T. I. Chuang and R. Bacigalupi 1975-5-7 4019 Colusa 4.5 mi se (by road) Leesville Comment
  UCD84431  Castilleja applegatei Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, 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. Many old undeveloped roads here. 817 Comment
  CDA12181  Castilleja applegatei subsp. martinii G. F. Hrusa 1993-5-2 10863 Colusa Frenzel Creek Research Natural Area; Point of ridge above mouth of Frenzel Creek, tributary of Little Stony Creek. S. side of creek. Comment
  CHSC114942  Castilleja applegatei subsp. martinii Lowell Ahart 2015-4-10 20013 Colusa Road cut, 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. Chapararal. 500 Comment
  CHSC1709  Castilleja applegatei subsp. martinii V. Holt 1946-4-18 Colusa Cache Creek. Comment
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Mar 2 2015
  CHSC71000  Castilleja applegatei subsp. martinii Vernon Oswald; Lowell Ahart 1998-5-7 8995 Colusa Bartlett Springs Rd. 1.6 mi west of Bear Valley Rd. 487 Comment
  CHSC88871  Castilleja applegatei subsp. martinii Christine Hantelman 2000-4-1 46 Colusa At side of Bear Valley Road. 365 Comment
  UCD13389  Castilleja applegatei subsp. martinii Steve Daniel 1986-4-13 86 -6 Colusa Colusa Co., 3.1 miles west of Rumsey on Hwy 16. N. facing slope. Comment
  JEPS81324  Castilleja applegatei subsp. pinetorum L. R. Heckard and J. C. Hickman 1982-7-6 5939 Colusa slope 1/2 mi NE of Summit Springs (E of trail); Snow Mountain, S side 1645 Comment
  CHSC115341  Castilleja attenuata Lowell Ahart 2015-4-10 20005 Colusa Normal size plants, on dark damp soil, along the south edge of Leesville Road. 445 Comment
  JEPS124209  Castilleja attenuata Lowell Ahart 2015-4-10 20005 Colusa About 1/2 mile east of Leesville, about 12 miles (air) northwest of Williams. Comment
  CHSC27851  Castilleja exserta Susan Perkins 1978-4-8 33 Colusa Meadow ca. 3 mi w of jct. of Hwys 20 and 16, s side of Bear Creek, ca. 18 mi sw of Williams. 321 Comment
  UCD81230  Castilleja exserta Ellen Dean; K. Mawdsley, B. Rice 2009-5-6 5567 Colusa Payne Ranch, lands to the SW of the jct. of Hwys. 16 and 20. Along Bear Creek south of Brophy Canyon, near old access road that leaves Hwy. 16 near milepost 6. 218 Comment
  CDA32834  Castilleja exserta P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  UCD15677  Castilleja exserta Anne B. Overturf 1989-4-8 13 Colusa Lake County border. Walker Ridge. 658 Comment
  UCD82329  Castilleja exserta Robin McMaster 1973-4-15 320 Colusa 10 mi NW of Rumsey. 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
  JEPS10302  Castilleja exserta subsp. exserta W. L. Jepson 1932-5-7 16255 Colusa 1 mi above Venado (sw Colusa County) 274 Comment
  UCR47925  Castilleja exserta subsp. exserta Eugene Tanimoto 1975-4-20 13 Colusa Bear Valley Road, 8.7 mi north of State Hwy 20 Comment
  CHSC27852  Castilleja exserta subsp. latifolia Phil Bulmert 1978-4-8 2 Colusa 5.1 mi w of Walker Ridge Rd., Hwy 20. 457 Comment
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Apr 23 2020
  CHSC81309  Castilleja foliolosa L. P. Janeway; B. Castro 2001-4-18 7023 Colusa Vicinity of Grapevine Creek, Sites-Lodoga Road, and Scotties Spring. 274 Comment
  JEPS124251  Castilleja foliolosa Lowell Ahart 2015-4-1 19988 Colusa Inner North Coast Range. 1/2 mile east of Lake County Line, 12 miles (air) east-northeast of Clear Lake (town), 17 miles (air) west of Williams. Comment
  JEPS81325  Castilleja miniata L. R. Heckard and J. C. Hickman 1982-7-6 5940 Colusa about 0.5 mi ne Summit Springs (s side of Snow Mt, e of trail); Snow Mt. 1645 Comment
  JEPS82554  Castilleja miniata L. R. Heckard 1983-7-27 6101 Colusa ca 2 mi w Stonyford road; Little Stony Creek 411 Comment
  CDA11256  Castilleja miniata subsp. miniata G. F. Hrusa 1994-11-7 11991 Colusa North Coast Biodiversity Arena; Frenzel Creek Research Natural Area, USFS. on banks of Frenzel Creek, a tributary of Little Stony Creek, approx. 2 miles above Stonyford-Lodoga Rd. on Goat Mtn. Rd. Comment
  CHSC111212  Castilleja miniata subsp. miniata David Isle 2013-8-23 2049 Colusa Stony Creek Watershed. W bank Salt Ck, ~ 150'NE of Dennis Dr Bridge on Isle Property. 374 Comment
  RSA0037133  Castilleja miniata subsp. miniata David W. Isle 2013-8-23 2049 Colusa W bank Salt Ck, ~150'NE of Dennis Dr Bridge on Isle Property. 374 Comment
  UCD163307  Castilleja rubicundula Craig D. Thomsen 1997-4-7 1897 Colusa Bear Valley. About 5 miles north of Hwy 20. Comment
  JEPS82742  Castilleja rubicundula subsp. lithospermoides L. R. Heckard and J. C. Hickman 1984-4-6 6150 Colusa near Bear Valley road junction with Route 20 (along Bear Valley road, e of Clear Lake Oaks) Comment
  CHSC112315  Castilleja rubicundula subsp. rubicundula Lowell Ahart 2013-5-1 18687 Colusa Inner North Coast Range. Near a small drainage, north of the wash and State Highway 20, just east of Lake County Line, 12.2 mile (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  JEPS81972  Castilleja rubicundula subsp. rubicundula Rimo Bacigalupi, T. Crovello and L. Heckard 1965-4-26 9042 Colusa 0.7 mi w Wilbur Springs and Bear Valley junction (on Blue Ridge along Bear Creek Road); Blue Ridge 341 Comment
  RSA182037  Castilleja rubicundula subsp. rubicundula Annetta Carter, Louise Kellogg 1953-6-20 3239 Colusa Road to Leesville, 6 miles north of Wilbur Springs Junction 400 Comment
  UCD82498  Castilleja rubicundula subsp. rubicundula Craig Thomsen; G. Harrington 2009-5-12 2857 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  SBBG128766  Castilleja rubicundula subsp. rubicundula L. Ahart 2013-5-1 18687 Colusa near a small drainage, N of the wash and 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
  CDA11400  Castilleja tenuis G. F. Hrusa, K. van Katwyk 1995-4-22 12120 Colusa Inner North Coast Ranges; flat on Walker Ridge Road, approx. 6 m. S of intersection with Bartlett Springs Rd. Comment
  RSA0121887  Caulanthus flavescens Roxana S. Ferris 1926-4-23 6405 Colusa Near Mountain House on the Williams-Stonyford Road. Comment
  UCD114214  Caulanthus flavescens W. C. Overton Jr. 1980-4-14 s.n. Colusa Into Bear Valley, ca. 1 mile N of junction of State Highway 16 and 20. Comment
  UCD114215  Caulanthus flavescens J. M. Tucker 1958-3-7 3364 Colusa State Highway 16, Cache Creek Canyon, 0.1 mile north of Yolo-Colusa County line. Comment
  CAS-BOT-BC40506  Caulanthus lasiophyllus Mrs. H. C. Cantelow 1936-4-11 1163 Colusa Bear Creek Canyon. 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
  UCD21573  Caulanthus lasiophyllus Craig D. Thomsen 2003-5-8 s.n. Colusa En route to Wilbur Hot Springs, approx 1/8 mile west of Bear Valley Rd on Wilbur Springs Rd. Open grassland at base of slope. 396 Comment
  CAS-BOT-BC48829  Ceanothus cuneatus Roxana S. Ferris 1926-4-23 6580 Colusa Stonyford Comment
  RSA399079  Ceanothus cuneatus Carolyn Sanford 1977-4-24 352 Colusa Above Barrel Springs Campground. 701 Comment
  UCD22472  Ceanothus cuneatus Brian Vanden Heuvel 2003-2-20 201 Colusa 6.7 miles west of Stonyford on Fouts Spring Road. Comment
  UCR206372  Ceanothus cuneatus subsp. cuneatus George K. Helmkamp, E. A. Helmkamp 2009-3-11 14369 Colusa Inner North Coast Range Foothills, along CA-20, 9.7 miles southwest of Williams, on the north side of Salt Creek 162 Comment
  JEPS82411  Ceanothus integerrimus L. R. Heckard 1969-5-28 Colusa ca 6 air mi w Stonyford (along Soney Creek near Fouts Springs) Comment
  UC2014137  Ceanothus integerrimus Ellen Dean, C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6059 Colusa Colusa County. On Lake County border. Along Walker Ridge Road, between Cold Spring and Buck Flat. Comment
  UCD170263  Ceanothus integerrimus D. O. Burge 2016-11-3 2187 Colusa Little Stony Creek watershed, roadside on Goat Mountain Road. 415 Comment
  UCD84451  Ceanothus integerrimus Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6059 Colusa Colusa County. On Lake County border. Walker Ridge. Along Walker Ridge Road, between Cold Spring and Buck Flat. 971 Comment
  UCD84453  Ceanothus integerrimus Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6059 Colusa Colusa County. On Lake County border. Walker Ridge. Along Walker Ridge Road, between Cold Spring and Buck Flat. 971 Comment
  CAS-BOT-BC83779  Ceanothus jepsonii D. O. Burge; V. Church 2007-12-28 972 b Colusa Mendocino National Forest, roadside on Goat Mountain Road 430 Comment
  HSC90415  Ceanothus jepsonii C. Wilson, P. Kittelson, M. Hardig 1992-4-11 42 Colusa Walker Ridge Rd., 1.0 mi S of Blue Oak Recreation Site 76 Comment
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Aug 18 2014
  UCD112067  Ceanothus jepsonii D. Sanchez-Mata 1996-7-3 s.n. Colusa Williams. Walker Ridge. Wilburg Springs-Wintun Camp. 850 Comment
  HSC43201  Ceanothus jepsonii var. albiflorus J. Walker 1977-4-24 27 Colusa Along Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  UCD81262  Ceanothus oliganthus var. sorediatus Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5427 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
  HSC98207  Ceanothus oliganthus var. sorediatus Steven Lagos 1974-5-4 43 Colusa 747 Comment
  CDA15500  Ceanothus parryi G. F. Hrusa, WTD 1998-6-19 14637 Colusa North Coast Ranges; Trough Ridge Rd. (to Fouts Springs, from Pacific Ridge Rd.) Comment
  CHSC84199  Centaurea melitensis Lowell Ahart 2003-7-14 10387 Colusa By a wash, on the east side of Bear Valley Road, about 3 miles northwest of Highway 20. 381 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
  UC73978  Centaurea solstitialis H. P. Chandler 1905-9-14 Colusa Princeton Comment
  UCR201558  Centaurea solstitialis George K. Helmkamp, E. A. Helmkamp 2008-10-14 14255 Colusa Sacramento Valley, along CA-20, 0.2 mile east of the Sutter County line 9 Comment
  UCR227905  Centaurium trichanthum Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5060 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20, area of ranch west of Hwy 16, near bridge that spans Bear Creek, c. 4.5 road miles south of junction of Hwy 16/20. Bank of Bear Creek near south end of bridge, east side of creek 555 Comment
  CAS-BOT-BC271546  Centromadia parryi subsp. rudis A. A. Heller 1941-9-22 16331 Colusa Along U.S. Highway #99W between Williams and Maxwell 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
  CHSC84391  Centromadia parryi subsp. rudis Lowell Ahart 2003-8-15 10510 Colusa On the south side of Highway 20, about 1 mile southwest of Williams. 27 Comment
  UC727676  Centromadia parryi subsp. rudis Milo S. Baker 1946-9-5 11624 Colusa 3 mi w of Colusa; Williams Comment
  UCD130150  Centromadia parryi subsp. rudis P. B. Kennedy 30-31 May 1922 s.n. Colusa Near Colusa. Comment
  UCD16094  Centromadia pungens J. Schmierer 1999-4-27 s.n. Colusa Exact location unknown. Comment
  CAS-BOT-BC279209  Centromadia pungens subsp. pungens Roxana Stinchfield 1916-7-8 380 Colusa Along Sycamore Slough - Stinchfield Ranch Comment
  JEPS12580  Centromadia pungens subsp. pungens R. F. Hoover 1936-5-22 1218 Colusa Williams 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
  CAS-BOT-BC279212  Centromadia pungens subsp. pungens David D. Keck 1933-5-30 2402 Colusa 1.8 miles west of Colusa on road to Williams Comment
  JEPS105679  Centromadia pungens subsp. pungens L. P. Janeway 2002-4-25 7525 Colusa Sacramento Valley; vicinity of Funks Creek and Tehama - Colusa Canal 51 Comment
  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
  UC1299375  Cephalanthera austiniae Freed W. Hoffman 1948-6-27 2525 Colusa 8.6 mi. s.w. Fouts Springs (Upper Letts Valley); w. Colusa Co., Upper Letts Valley 1310 Comment
  RSA46869  Cerastium arvense Doris K. Kildale 1927-04 3245 Colusa Stony Ford. Comment
  CHSC81263  Cercis occidentalis J. Trizzino 2001-3-31 13 Colusa Bear Valley Road about 2 mi from southern entrance to valley along east side of road. 408 Comment
  RSA670064  Cercocarpus betuloides G. L. Webster 1989-5-6 7698 Colusa Walker Ridge, near Cold Springs Mt. Near border with Lake County. Comment
  UCD58111  Cercocarpus betuloides Ellen Dean; G. Harrington and P. McIntyre 2007-3-16 3375 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. East of Destanella. 576 Comment
  UCD57299  Chaenactis glabriuscula Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3670 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
  CAS-BOT-BC284537  Chaenactis glabriuscula var. heterocarpha Annetta Carter 1938-5-8 1394 Colusa Bear Creek Canyon, 4 miles southeast of Wilbur Springs, Inner North Coast Range Comment
  CAS-BOT-BC284538  Chaenactis glabriuscula var. heterocarpha A. A. Heller 1940-5-6 15580 Colusa A few yards east of the Lake County line 232 Comment
  UCD130361  Chaenactis glabriuscula var. heterocarpha John M. Tucker 1969-4-26 4163 Colusa east of road, in middle part of Bear Valley. Comment
  CAS-BOT-BC277632  Chaenactis glabriuscula var. megacephala James Jokerst 1985-4-4 220 Colusa Near Rail Canyon Comment
  UCD74341  Chaenactis glabriuscula var. megacephala G. Ledyard Stebbins 1968-5-10 6685 Colusa Summit of Walker Ridge, on Lake- Colusa County line, between Hwy 20 and Leesville - Bartlett Springs Rd. South of Leesville at summit of Cold Spring Mtn. (Note: date in notebook is 10 May, but labels made by Stebbins at CAS say 15 May.) 1091 Comment
  CHSC94455  Chamaesyce maculata Lowell Ahart 2006-8-9 13170 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS2596  Chamaesyce ocellata subsp. rattanii Volney Rattan June 1884 Colusa n San Francisco Bay; Coast Mts., Stony Creek; Stony Creek, Colusa Co., N of San Francisco Bay Comment
  CHSC84965  Chamaesyce serpillifolia subsp. serpillifolia Lowell Ahart 2003-10-23 10665 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
  JEPS104407  Chamaesyce serpillifolia subsp. serpillifolia Lowell Ahart 2003-10-23 10665 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
  SBBG67773  Chamaesyce serpillifolia subsp. serpillifolia Mrs. H. P. Bracelin 1931-10-1 565 Colusa Indian Crk, Lodoga Comment
  JEPS75724  Cheilanthes gracillima L. R. Heckard 1974-9-9 3859 Colusa ca. 1/4 mi se Foutch Camp; Snow Mt 1828 Comment
  CHSC62917  Cheilanthes intertexta Vernon H. Oswald; Lowell Ahart 1994-4-6 6061 Colusa Goat Mtn. Rd. at Sullivan Creek, 1.2 mi SW of Digger Pine Flat, S of Stonyford. 469 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
  CDA1337  Chenopodium album L. Ahart 2004-10-4 11430 Colusa East side of Leesville Road, about 4.7 miles by road southeast of the intersection of Bear Valley Road, Leesville Ladoga Road and Leesville Road, northeast of Bear Valley. Comment
  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
  RSA724893  Chenopodium album L. Ahart 2006-8-22 13221 -A Colusa south side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford. 349 Comment
  JEPS75836  Chenopodium pumilio L. R. Heckard 1974-9-11 3951 Colusa edge of meadow just e Foutch Camp; Snow Mt. 1859 Comment
  JEPS80466  Chimaphila menziesii Alice Q. Howard 1972-7-10 8 Colusa wet mossy spring area crossing trail from Fouts Camp to Box Springs (highest of 2 areas on n. side of ridge separating Trout & Paradise Creeks); Snow Mt. 1676 Comment
  UCD37706  Chloris virgata Beecher Crampton 1961-7-20 5932 Colusa 2 miles S of Grimes. Comment
  CHSC77613  Chorizanthe membranacea Heidi West; Caroline Warren 1998-5-26 Colusa Vicinity of Antelope Valley, Huffmaster Road, and Sites. Shale slope in blue oak woodland. 167 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
  CHSC86996  Chorizanthe membranacea B. Castro 2003-5-14 1433 Colusa Vicinity of Logan Ridge, Sulphur Gap and Lurline Creek. On west edge of Sacramento Valley. 134 Comment
  RSA133247  Chrysothamnus nauseosus subsp. albicaulis Peter H. Raven, R. Snow 1959-9-11 14416 Colusa 0.5 mile south of Snow Mt. 1921 Comment
  SEINET7042721  Chrysothamnus parryi A. G. Vestal 1938-9-1 s.n. Colusa Along the top of a trough, Springs Ridge near Foxtrap Springs. Fouts Spring quadrangle UTM Zone 10, 530960mE, 4350980mN. Comment
  UC1532347  Cicuta Vernon Oswald 1986-6-30 2176 Colusa North end of Lily Pond near Letts Lake. 1188 Comment
  CDA1157  Cirsium cymosum T. C. Fuller 1958-5-27 3667 -A Colusa South of Highway 20, 1 mile west of junction with Highway 16. 0 Comment
  JEPS82545  Cirsium cymosum var. cymosum L. R. Heckard 1983-7-27 6116 Colusa about 1/4 mi w Summit Springs (s side of mt.); Snow Mt. 1500 Comment
  UC1299440  Cirsium douglasii var. douglasii Freed W. Hoffman 1947-6-19 1669 Colusa Cooks Springs North Coast Ranges Comment
  UCD57628  Cirsium occidentale var. venustum Michele Lanctot; with Plant Biology 102 2007-4-29 4 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central part of ranch. Thompson Canyon. Northern edge of trail. 361 Comment
  UC71781  Citrullus colocynthis var. lanatus H. P. Chandler Oct. 1905 Colusa Princeton 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-BC164146  Clarkia concinna David D. Keck 1933-5-30 2401 Colusa 1 mile east of Lake County line, west of Wilbur Springs Comment
  JEPS108811  Clarkia concinna subsp. concinna Lowell Ahart 2006-6-11 12668 Colusa On the west 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
  SJSU11006  Clarkia concinna subsp. concinna J. B. Willis Jr 1969-5-31 200 Colusa by State Hwy 20, 0.5 mi W of junction with Hwy16 c. midway between Williams & Clear Lake Comment
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Aug 26 2011
  UC1234600  Clarkia concinna subsp. concinna Peter H. Raven 1962-5-31 17909 Colusa 2.5 mi e Lake County line (State Highway 20) Comment
  SEINET12193550  Clarkia gracilis subsp. albicaulis R. A. DeMartile 1983-1 107 Colusa Bartlett Springs Road N of Baldy Mountain 762 Comment
  CAS-BOT-BC172035  Clarkia gracilis subsp. gracilis Tamara Gedik; Thom Heinz; Rebecca Siegle 1996-5-4 52 Colusa 8.4 mi. north of Indian Reservoir Rd. on Walker Ridge Rd., campground. 670 Comment
  UC903259  Clarkia modesta Ethel Crum 1932-5-7 1462 Colusa Lodoga Inner North Coast Ranges 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
  CHSC89878  Clarkia purpurea subsp. quadrivulnera B. Castro; L. Janeway 2001-5-10 1247 Colusa Vicinity of Grapevine Creek, Antelope Creek, and Andys Canyon. Near dirt road paralleling N-S-trending perennial creek, on moderately steep NNE-facing slope, just down from blue oaks in grassy opening. 390 Comment
  UCD66864  Clarkia purpurea subsp. quadrivulnera Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5067 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
  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
  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
  HSC94112  Clarkia rhomboidea G. Fred Hrusa 1998-6-19 14604 Colusa Above Upper Little Stony Creek, Goat Mtn. Rd., about 2 km W of campground 490 Comment
  UC1585901  Clarkia rhomboidea Barbara Ertter 1989-7-1 8597 Colusa 2.2 mi s of Rt. M-10 (Bear Creek-Fouts Spring Rd.) (road to Goat Mt. Lookout, at head of S. Fk. Stony Creek, ca. 12 air mi wsw of Stonyford) 1500 Comment
  RSA537479  Clarkia rhomboidea Barbara Ertter 1989-7-1 8597 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
  SBBG122897  Clarkia rhomboidea B. Ertter 1989-7-1 8597 Colusa rd to Goat Mtn lookout, 2.2 mi S of Bear Crk-Fouts Spring Rd, head of S Fk of Stony Crk 1500 Comment
  CDA14915  Claytonia exigua G. F. Hrusa 1993-5-2 10855 Colusa North Coast Ranges; Frenzel Creek Research Natural Area. Mendocino National Forest. Mouth of Frenzel Creek. Comment
  CHSC62848  Claytonia exigua subsp. exigua Vernon H. Oswald; Lowell Ahart 1994-3-23 6015 Colusa Frenzel Creek Research Natural Area on the S side of Liitle Stony Creek, in the section on the E side of Frenzel Creek, S of Stonyford. 518 Comment
  RSA614426  Claytonia exigua subsp. exigua K. L. Chambers 1988-3-24 5405 Colusa Hwy 20., ca. 22 mi. west of Williams, Inner Coast Range. 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
  UCD162997  Claytonia parviflora Craig D. Thomsen 2000-3-31 2086 Colusa Bear Creek Botanical Management Area. Roadside shoulder of Hwy 20 (south side), about 0.2 mile west of Hwy 20/16 intersection. 345 Comment
  UCD66466  Claytonia parviflora Craig D. Thomsen 2001-4-12 2458 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  UCD67063  Claytonia parviflora Craig D. Thomsen 2008-3-20 2717 Colusa BLM Payne Ranch. Lands to the SW of Hwy 20/16 intersection. South side of Hwy 20, about 0.5 mile west of Hwy 16/20 intersection, at Colusa Co. milepost 2.63. 450 Comment
  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
  RSA590192  Claytonia parviflora subsp. parviflora Michael A. Vincent, Robert M. Rhode 1996-3-30 7285 Colusa Along Bear Valley Rd. above Bear Creek, 1.4 mi. S jct. Wilbur Springs Rd. Comment
  UC638661  Claytonia parviflora subsp. parviflora Ethel Crum 1938-5-8 2022 Colusa 3 mi n Leesville; Inner North Coast Range 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
  UCD67098  Claytonia saxosa Ellen Dean; Davis Botanical Society 2008-5-31 5026 Colusa west of I-5 at Maxwell, Goat Mountain, ridge below summit off of Goat Mountain Road. 1734 Comment
  CHSC81292  Clematis lasiantha L. P. Janeway; B. Castro 2001-4-26 7027 Colusa Vicinity of Grapevine Creek, Sites-Lodoga Road, and Scotties Canyon. 286 Comment
  JEPS108908  Clematis ligusticifolia Lowell Ahart 2006-8-9 13094 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford 455 Comment
  JEPS121782  Clematis ligusticifolia B. Castro 2008-7-10 1773 Colusa Sacramento Valley. Along S bank of Sacramento River, ca 5 mi N of town of Colusa, just N of Reervation Road; in undesignated Section near Colusa Rancheria. Comment
  SBBG27284  Collinsia bartsiifolia var. bartsiifolia E. Crum 1938-5-8 2020 Colusa 3 mi N of Leesville Comment
  UCSB63619  Collinsia grandiflora Maslin, Linyi 1981-4-15 Colusa Ca. 0.5 km w of jct of Hwys 20 & 16; s side of Bear Creek; Ca. 27 km sw of Williams; Wilbur Springs Quadrangle, 15'; S central border of Sect. 36. T14N, R5W 319 Comment
  UCD123553  Collinsia greenei G. Ledyard Stebbins Jr. 1964-7-4 6170 Colusa northeast side of Mt. St. John, west of Stonyford. 1524 Comment
  UCD57100  Collinsia heterophylla Gordon Harrington; Diana Hickson 2007-4-7 0015 Colusa BLM Payne Ranch, SW of intersection of Hwy 16 and Hwy 20, 3/4 mile WNW of Roadkill Cafe. 470 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
  UCR104588  Collinsia heterophylla Peter S. Lathrop 1993-4-15 s.n. Colusa North Coastal Range, along California State Highway 16, 5 miles south of State Highway 20 305 Comment
  UCD162990  Collinsia sparsiflora Craig D. Thomsen 2000-3-8 2035 Colusa Bear Creek Botanical Management Area. Roadside shoulder of Hwy 20 (south side), about 0.5 mile west of Hwy 20/16 intersection. 345 Comment
  RSA0016802  Collinsia sparsiflora Aaron Liston, M. Blumler 1987-4-26 667 -4 Colusa Bear Valley - Lodoga Road, 6.6 miles S of Bartlett Springs Jct. Comment
  CHSC70908  Collinsia sparsiflora var. arvensis Vernon Oswald; Lowell Ahart 1998-4-21 8946 Colusa Stonyford-Lodga Rd. 4.2 mi south of Stonyford. 384 Comment
  JEPS6657  Collinsia sparsiflora var. arvensis A. A. Heller 1937-4-24 15352 Colusa 15 m w Williams (Hwy 20) Comment
  JEPS94165  Collinsia sparsiflora var. arvensis Vernon Oswald and Lowell Ahart 1998-4-21 8946 Colusa Stonyford-Lodoga Rd. 4.2 mi. s. Stonyford 384 Comment
  UCD57726  Collinsia sparsiflora var. arvensis Jordan Thompson; with Plant Biology 102 2007-4-29 5 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central/Eastern part of ranch. Craig Canyon. North side of Craig Creek on south side of unimproved road. 335 Comment
  UCD58120  Collinsia sparsiflora var. arvensis Ellen Dean; PLB 102 Class 2007-4-29 3716 Colusa Payne Ranch. West of Hwy. 16. Ca. 2 road miles S of junction of Hwy. 20 and Hwy. 16. Through Craig Canyon. 304 Comment
  POM273490  Collinsia sparsiflora var. arvensis Lyman D. Benson 1933-4-16 4332 Colusa 5 miles east of Lake County line. Mt. Range: Inner N. Coast; Watershed: N. Fork Cache Creek. 457 Comment
  HSC44465  Collinsia sparsiflora var. collina R. York 1978-4-22 140 Colusa Bear Valley Rd., 1.5 mi. from its junction with S.R. 20 409 Comment
  UC1049530  Collinsia sparsiflora var. collina Rimo Bacigalupi 1950-4-16 3114 Colusa 4 mi s Ladoga (and 6 mi nnw of Leesville, along Little Indian Creek); Indian Valley, Little Indian Creek 396 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
  UC725811  Collinsia sparsiflora var. sparsiflora A. A. Heller 1937-4-24 Colusa 15 mi w of Williams Comment
  JEPS17960  Collinsia sparsiflora var. sparsiflora George B. Rossbach 1955-4-9 491 Colusa w edge Colusa Co., Rt 20 w edge Colusa Co. 563 Comment
  JEPS81340  Collinsia torreyi var. wrightii L. R. Heckard and J. C. Hickman 1982-7-6 5953 Colusa West Peak Snow Mt (second meadow from Cedar Camp to Dark Hollow Cirque) 1981 Comment
  HSC42333  Collomia diversifolia M. A. Baker 1977-4-24 223 Colusa Walker Ridge Rd. above Barrel Springs Campground 701 Comment
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Jul 31 2014
  CDA40008  Collomia diversifolia Vernon H. Oswald & Lowell Ahart 1998-5-7 9006 Colusa Bartlett Springs Road 2.1 miles west of Bear Valley Road, 0.8 mile east of Sawtelle Valley and Grapevine Flat roads. Comment
  JEPS80138  Collomia tinctoria L. R. Heckard with J. Hickman 1980-7-2 5298 Colusa just above Summit Spring entrance to Snow Mt. trail (ca 10 mi w of Stonyford, Colusa-Lake County boundary); Snow Mt. 1630 Comment
  RSA113933  Collomia tinctoria H. K. Sharsmith 1953-7-1 4402 Colusa Linger Longer Camp, Goat Mountain, Mendocino National Forest 1585 Comment
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Jun 30 2012
  UCD57550  Convolvulus arvensis Andrew Pedersen; 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. 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. 304 Comment
  UCR201548  Convolvulus arvensis George K. Helmkamp, E. A. Helmkamp 2008-10-14 14266 Colusa Sacramento Valley, along River Road (generally following the Sacramento River), 8.4 miles north of Colusa 17 Comment
  UCR205139  Conyza canadensis George K. Helmkamp, E. A. Helmkamp 2008-10-14 14243 Colusa Sacramento Valley, along CA-20, 0.2 mile east of the Sutter County line 9 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
  CHSC67608  Cordylanthus palmatus James D. Jokerst 1988-8-23 3038 Colusa Colusa National Wildlife Refuge S of Willows, in Tract 7 ca. 150 m NE of Colusa Trough. 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
  JEPS66469  Cordylanthus pilosus subsp. pilosus G. D. Carr 1971-7-29 604 Colusa Lodoga, Lodoga-Stoneyford Rd 396 Comment
  JEPS75706  Cordylanthus pilosus subsp. pilosus L. R. Heckard and R. Bacigalupi 1976-9-6 4456 Colusa 6 airmiles se Fouts Springs (along road to Summit Springs, below and w of Summit Springs, 1 mi n of junction with Stoneyford Rd., Colusa-Lake County line); Snow Mt. 1219 Comment
  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
  UCD123116  Cordylanthus pringlei Craig Thomsen; Art Shapiro 2004-9-16 s.n. Colusa along Cool Springs Road. Comment
  UCD123117  Cordylanthus pringlei Craig Thomsen; Art Shapiro 2004-9-16 s.n. Colusa along Cool Springs Road. Comment
  UCD13381  Cornus glabrata Charles Martin 1986-5-17 30 Colusa Along roadside, 2.8 miles west of Stonyford. Along Foot Springs Rd. Comment
  CHSC75703  Cornus sericea subsp. occidentalis Vernon H. Oswald; Lowell Ahart 1999-6-22 9777 Colusa Lily Pond near Upper Letts Lake west of Stonyford. 1243 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
  UCD101846  Crassula connata Sam Olusuyi 1967-4-29 37 Colusa Bear Valley, 4.3 miles north of junction of State Highway 20 and Wilbur Springs Road. 396 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
  UCD38810  Crepis acuminata Beecher Crampton 1958-5-19 4803 Colusa 5.5 miles south of Ladoga. Comment
  JEPS15561  Crepis monticola G. Thomas Robbins with L. R. Heckard 1956-7-25 3719 Colusa Snow Mt. West; summit, Lake-Colusa Co. boundary 2145 Comment
  UC572539  Cressa truxillensis H. S. Yates 1936-8-14 6133 Colusa 3 mi. s. Colusa; Colusa Quad. 15 Comment
  UCD126230  Cressa truxillensis H. S. Yates 1936-8-14 6133 Colusa 3 miles south of Colusa. 15 Comment
  UCD84428  Crocanthemum scoparium Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6043 Colusa Walker Ridge. Along Walker Ridge Road on southern part of the ridge, south of turnoff to Indian Valley Reservoir. 683 Comment
  CHSC61424  Croton setiger Vernon H. Oswald 1993-8-16 5805 Colusa Sacramento National Wildlife Refuge. Refuge located ca. 7 mi S of Willows, W1/4 of Tract 44, near the S boundary of the refuge. Field on the N side of Hunters Creek. 24 Comment
  UCR205144  Croton setiger George K. Helmkamp, E. A. Helmkamp 2008-10-14 14249 Colusa Sacramento Valley, along CA-20, 0.2 mile east of the Sutter County line 9 Comment
  CHSC77404  Crypsis schoenoides Heidi West; Joyce Lacey-Rickert 1998-10-29 Colusa Vicinity of Antelope Valley and Sites. 109 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
  SEINET12765117  Crypsis schoenoides Lowell Ahart 2006-8-9 13116 Colusa North side and under the bridge across Stony Creek, just north of Stonyford.; 0 347 Comment
  UC1618176  Crypsis schoenoides Barbara Ertter with Elizabeth Neese, Laura Fujii, Dawn Espindola 1989-10-21 8827 a Colusa n of Lodoga (se end of East Park Reservoir); East Park Reservoir 365 Comment
  UCD145274  Crypsis schoenoides Barry Hammel 1976-8-5 427 Colusa east side of Highway 45 near Colusa Golf Club. 30 Comment
  CAS-BOT-BC190165  Crypsis vaginiflora Herbert L. Mason 1945-7-11 12643 Colusa Butte Lodge Outing Club, three miles above Colusa. Near Butte Creek. Comment
  POM198510  Crypsis vaginiflora Roxana Stinchfield 1916-7-11 466 Colusa Davis Tule, near Sycamore Slough. Comment
  UCD66867  Crypsis vaginiflora Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5070 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
  CHSC14127  Cryptantha L. V. Ritter 1969-4-30 236 Colusa Ca 100 yds. w of the junction of Highway 20 and 16, ca 50 yds. n of Highway 20. 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
  SBBG40520  Cryptantha excavata R. F. Hoover 1968-5-27 11099 Colusa Bear Crk cyn N of Hwy 20 (near Wilbur Springs) Comment
  UC79296 Image available Cryptantha excavata Katharine Brandegee Colusa Stites [Sites], Colusa Co. Comment
  CHSC79095  Cryptantha flaccida B. Castro; C. Warren 2000-4-3 1048 Colusa Vicinity of Antelope Valley, Sites-Lodoga Rd, and Grapevine Ck. 179 Comment
  UC1177897  Cryptantha flaccida Peter M. Ray 1950-4-16 1715 Colusa junction of North Fork and Big Stony Creek (on n side of canyon) 548 Comment
  UC1613300  Cryptantha flaccida Charles M. Belshaw April 1937 2881 Colusa vicinity of Cook's Spring (Inner North Coast Ranges, Devil's Ridge); Inner North Coast Ranges, Devil's Ridge Comment
  HSC3611  Cryptantha hispidula Leo Koch 1940-4-29 936 Colusa Near Lake and Colusa county line along Hwy. 20, Williams Hwy. Comment
  UC763082  Cryptantha hispidula R. F. Hoover 1941-5-2 4983 Colusa just e Lake County line (on Williams-Clear Lake highway) Comment
  UCD66686  Cryptantha hispidula Craig D. Thomsen 2000-5-11 2313 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
  CDA15300  Cryptantha intermedia G. F. Hrusa 1993-5-2 10865 Colusa North Coast Ranges; Frenzel Creek Research Natural Area-Mendocino Natl. Forest. Mouth of Frenzel Creek at confluence with Little Stony Creek. Comment
  CHSC146  Cryptantha intermedia V. Holt 1935-5-17 Colusa Stonyford. Comment
  RSA128429  Cryptantha intermedia Robert F. Hoover 1941-5-2 4984 Colusa Just east of Lake County line on Williams-Clear Lake Highway. Comment
  SDSU19615  Cryptantha intermedia Michael G. Simpson, Sean Ryan 2010-6-21 3366 Colusa Mendocino National Forest. Forest road 16N03 (to Goat Mtn.), ca. 0.2 miles south of junction with 16N18, 1.1 miles line-of-sight northwest of Goat Mountain peak. 1735 Comment
  UC1051711  Cryptantha intermedia Helen K. Sharsmith 1953-6-19 4278 Colusa 1 mi n Trough Springs (on Trough Springs Ridge); Inner North Coast Ranges, Mendocino National Forest 914 Comment
  UC1212064  Cryptantha intermedia Ethel Crum 1938-5-8 2027 Colusa 3 mi n Leesville; Inner North Coast Range Comment
  UC638656  Cryptantha intermedia Ethel Crum 1938-5-8 2027 Colusa 3 mi n Leesville; Inner North Coast Range Comment
  UC857152  Cryptantha intermedia Alice Eastwood and John Thomas Howell 1938-5-16 5629 Colusa Lake-Colusa county line on road to Williams Comment
  UCD63120  Cryptantha intermedia Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4950 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20. 405 Comment
  UCD82532  Cryptantha intermedia Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5684 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
  UCR80860  Cryptantha intermedia G. Fred Hrusa 1993-5-2 10865 Colusa Frenzel Creek Research Natural Area, Mendocino National Forest. Point of ridge on south side of mouth of Frenzel Creek at confluence with Little Stony Creek. 450 Comment
  RSA114163  Cryptantha intermedia H. K. Sharsmith 1953-6-19 4278 Colusa One mile north of Trough Springs on Trough Springs Ridge. Mendocino National Forest 915 Comment
  UCD37192  Cryptantha intermedia Beecher Crampton 1958-5-19 4820 Colusa Colusa County, 4-8 miles south of Lodoga, Little Stony Creek Canyon. Comment
  HSC3610  Cryptantha intermedia var. hendersonii Leo Koch 1940-4-29 936 Colusa Near Lake and Colusa county line along Hwy. 20, Williams Hwy. Comment
  UCD163839  Cryptantha intermedia var. intermedia Craig D. Thomsen 2001-4-12 2469 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UC638663  Cryptantha microstachys Ethel Crum 1938-5-7 2019 Colusa 4.2 mi n Rumsey; Inner North Coast Range, Comanche Hills 254 Comment
  UCD84446  Cryptantha muricata Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6054 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
  UC1731392  Cryptantha nemaclada Dean W. Taylor 1998-6-16 16661 Colusa Sulphur Creek canyon 0.5 mi below (e) Wilbur Springs (n-facing shale slide); North Coast Ranges, Walker Ridge and vicinity 381 Comment
  UC763256  Cryptantha nemaclada R. F. Hoover 1938-4-24 3229 Colusa ridge between Venado and Leesville Comment
  JEPS80390  Cryptantha simulans L. R. Heckard and J. Hickman 1981-6-22 5623 Colusa Dark Hollow trail Snow Mt. 1935 Comment
  CHSC47984  Cryptantha torreyana Vernon Oswald 1986-6-30 2177 Colusa Northwest side of Lily Pond near Letts Lake. Roadway. 1188 Comment
  JEPS80034  Cryptantha torreyana L. R. Heckard 1974-9-10 3900 A Colusa top of East Peak Snow Mt., East Peak 2148 Comment
  UC1177889  Cryptantha torreyana Peter M. Ray 1950-4-16 1733 Colusa canyon of North Fork Big Stony Creek ca 1 mi below crossing of the stream North Fork Big Stony Creek Comment
  UCD110847  Cupressus macnabiana Christopher Mallek 2008-1 FC- 1 Colusa Frenzel Creek. 654 Comment
  CAS-BOT-BC80806  Cupressus sargentii C. B. Wolf; E. R. Johnson 1934-10-15 6189 Colusa [Cook] Cooks Springs, western part of county 548 Comment
  RSA17616  Cupressus sargentii C. B. Wolf, E. R. Johnson 1934-10-15 6189 Colusa Cooks Springs, western part of county 549 Comment
  NY16798  Cupressus sargentii C. B. Wolf 1934-10-15 6189 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
  CDA35676  Cuscuta approximata CDFA Staff 2011-11-5 PDR# 1552505 Colusa Maxwell. 0 Comment
  UCD38966  Cuscuta brachycalyx Beecher Crampton 1961-7-20 5935 Colusa 4 miles SE of Grimes, along Knight's Landing Road. Comment
  JEPS80873  Cuscuta californica L. R. Heckard and J. C. Hickman 1980-9-15 5436 Colusa n of road at Summit Springs, Lake-Colusa County boundary Snow Mt., Summit Springs 1524 Comment
  RSA133250  Cuscuta ceanothi P. H. Raven 1959-9-11 14423 Colusa Bonnie View 915 Comment
  JEPS90814  Cuscuta salina Dean W. Taylor 1993-8-31 14072 Colusa 200 m e of North Fork Logan Creek (Sacramento Valley, Sacramento National Wildlife Refuge); Sacramento Valley, Sacramento National Wildlife Refuge 24 Comment
  CAS-BOT-BC190176  Cynodon dactylon Beecher Crampton 1958-6-26 4975 Colusa 5.5 miles south of College City. 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
  UCD60063  Cynodon dactylon Beecher Crampton 1958-6-26 4975 Colusa 5.5 miles south of College City, along Grieve road. Comment
  CHSC116060  Cynoglossum grande Richard R. Halse 2014-3-25 9032 Colusa Along the Sites-Logoda Road ca. 4.7 miles northeast of Logoda; on the west end of Grapevine Pass. 527 Comment
  CHSC62839  Cynoglossum grande Vernon H. Oswald; Lowell Ahart 1994-3-23 6023 Colusa Little Stony Creek just W of Digger Pine Campground on Goat Mtn. Rd., S of Stonyford. On slopes along the creek. 490 Comment
  CHSC112020  Cynoglossum grande David Isle 1977-4-5 2069 Colusa Mendocino National Forest. About 1.3 mile NE of Fouts Springon Upper Davis Flat. 493 Comment
  JEPS30814  Cyperus difformis John Thomas Howell 1944-7-18 19838 Colusa 3 mi. w. Williams 30 Comment
  CDA38928  Cyperus difformis J. T. Howell 1944-7-18 19838 Colusa 3 miles west of Williams. Comment
  UCD141016  Cyperus difformis P. B. Kennedy 9-10 Aug 1921 s.n. Colusa exact location unknown. Comment
  SEINET9753686 Image available Cyperus eragrostis Richard Carter 2006-7-31 Colusa 3.7 mi SSE Colusa, jct. Hwy CA 20 and Hwy CA 45 Comment
  UC1100528  Cyperus eragrostis Herbert L. Mason and Verne Grant 1946-9-5 13113 Colusa 1.6 mi. w. Williams (rd. to Lake Co.) Comment
  UCD141052  Cyperus erythrorhizos P. B. Kennedy 30-31 May 1922 s.n. Colusa Exact location unknown. Comment
  CHSC112619  Cypselea humifusa Lowell Ahart 2013-10-1 19073 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
  JEPS73451  Cystopteris fragilis L. R. Heckard 1972-7-8 3048 Colusa n side ridge running se of Snow Mt (West Peak) 2011 Comment
  RSA714647  Dactylis glomerata Daisie Huang 2006-4-15 6041502 Colusa Maxwell rest stop on I-5. 25 Comment
  JEPS95650  Datisca glomerata Vernon H. Oswald and L. Ahart 1999-6-22 9787 Colusa 2.2 mi west of Stonyford-Lodoga Road on County Road 42 paralleling Little Stony Creek: T17N R6W Sect. 30, ca. 1400 ft, chaparral, serpentine substrate. Herbaceous perennial ca. 1 m tall on the rocky bank of Little Stony Creek. 426 Comment
  RSA724964  Datisca glomerata L. Ahart 2006-8-9 13146 Colusa North side and just east of the bridge across Stony Creek, just north of Stonyford 348 Comment
  UCD57616  Datisca glomerata Jill Poloske; with Plant Biology 102 2007-4-29 3 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central part of ranch. Thompson Canyon. In bed of Thompson Creek. 304 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
  JEPS120797  Datura stramonium var. tatula Lowell Ahart 2013-10-1 19083 Colusa Strand of East Park Reservoir, about 2.5 air miles SE of Stonyford, about 2.5 miles NW of Lodoga, about 10 air miles NW of Sites. Comment
  CHSC112274  Daucus pusillus Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18625 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
  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
  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
  JEPS80053  Delphinium antoninum L. R. Heckard and J. Hickman 1979-6-15 5053 Colusa ne slope West Peak ridge (cirque between peaks); Snow Mt. 1981 Comment
  UCD163887  Delphinium hesperium Craig D. Thomsen 2002-4-12 2439 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 1 mile west of Hwy 20/16 instersection. Comment
  UCD18513  Delphinium hesperium Roman Gaukin 1958-5-4 s.n. Colusa Bear Valley. Comment
  CDA15469  Delphinium hesperium subsp. pallescens G. F. Hrusa, T. D. Wilfred 1998-6-19 14606 Colusa North Coast Ranges; Scattered perennial on steep slope within chaparral above upper Little Stony Creek. Goat Mtn. Rd. ~ 1.5 km. W of of campground. Non-serpentine. Flowers blue, other plants nearby range to light blue and pinkish. Crown attachment firm. Comment
  UC1607881  Delphinium hesperium subsp. pallescens C. G. Nast 1936-4-17 144 Colusa Williams to Lake county Highway Comment
  HSC45441  Delphinium hesperium subsp. pallescens M. Alcasas 1978-4-23 58 Colusa Bartlett Springs Rd., 0.5 mi. from junction with Bear Valley Rd 457 Comment
  HSC87027  Delphinium hesperium subsp. pallescens Terry Hines, Ellen Purcell, N. Williams 1988-4-16 55 Colusa 4.2 mi. W on Goat Mtn. Rd., along Stony Creek 0.5 mi. W of Digger Pine Campground 450 Comment
  HSC71332  Delphinium patens Thomas W. Nelson, Jane P. Nelson 1979-4-11 4613 Colusa Along Leesville to SR 20 cutoff 5 mi. E of Leesville Comment
  CHSC35564  Delphinium patens subsp. patens J. P. Smith; Tom Nelson, Jane Nelson 1978-4-2 9567 Colusa Bear Valley Road, 2.1 miles from its junction with State Route 20. 365 Comment
  CAS-BOT-BC33189  Delphinium uliginosum M. K. Curran 1884-7-1 s.n. Colusa Epperson's Comment
  UCD82510  Delphinium uliginosum Craig Thomsen; G. Harrington 2008-5-12 2868 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  UCD96738  Delphinium variegatum Clinton C. Shock 1980-5-3 65 Colusa Bear Valley, west side, ca 12 miles north of State Highway 20. 384 Comment
  HSC95711  Delphinium variegatum A. Bebensee 1984-4-21 10 Colusa 9.8 mi. N of Hwy. 20 on Bear Valley Rd., 0.5 mi. into field on E side of rd. Comment
  POM174567  Delphinium variegatum Roxana S. Ferris 1926-4-23 6582 Colusa 2 miles from Stony Ford. 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
  UCD15287  Delphinium variegatum Claire Warshaw 1985-4-13 7 Colusa along Bear Valley Road, 8 miles norhtwest from intersection with highway 20; 390 Comment
  UCD15427  Delphinium variegatum Margit Sands 1985-4-13 30 Colusa in Bear Valley, 7.4 miles north of Wilbur Hot Springs rd.; 390 Comment
  CHSC1465  Delphinium variegatum subsp. variegatum 1946-4-18 Colusa Cache Creek. Comment
  CHSC89827  Delphinium variegatum subsp. variegatum B. Castro; L. Janeway 2001-5-2 1244 Colusa Vicinity of Grapevine Creek, Antelope Creek, and Pence Mtn. In flat to undulating open grazed grassland between hills of blue oak woodland. Adjacent to dirt road paralleling N-S-trending creek. 335 Comment
  HSC87075  Delphinium variegatum subsp. variegatum L. Blackford, S. Branch, D. Malm 1988-4-17 77 Colusa 1.3 mi. S of Bear Valley Rd. from corner of Brim Rd. and Bear Valley Rd. Comment
  UCR261612  Delphinium variegatum subsp. variegatum Ann Howald 2003-3-12 2280 Colusa Inner North Coast Ranges, Indian Valley, west side of East Park Reservoir, c. 2 miles southeast of Stonyford 379 Comment
  JEPS80182  Deschampsia danthonioides L. R. Heckard with J. Hickman 1980-7-3 5334 Colusa ca. 10 mi. w. Stonyford (just w. of Summit Springs, s.w. Snow Mt.); Colusa-Lake Co. Boundary 1548 Comment
  SD27858  Deschampsia danthonioides Carl B. Wolf 1928-5-8 2127 Colusa Sacramento Valley; 3 miles south of Arbuckle 42 Comment
  UCD163709  Deschampsia danthonioides Craig Thomsen 1999-5-10 2021 Colusa Colusa County. At confluence of Sulphur Creek and Bear Creek. About 3 miles north of Hwy 20. Comment
  SEINET10524208  Deschampsia danthonioides A. Arthur Heller 1902-5-1 Heller 5435 Colusa Near College City. Comment
  UCD62774  Deschampsia danthonioides var. gracilis A. A. Beetle 1942-5-21 3275 Colusa 12 miles north of Williams. 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
  CAS-BOT-BC500072  Dichelostemma capitatum Roxana S. Ferris 1917-4-17 614 Colusa Sycamore Slough Comment
  HSC31688  Dichelostemma capitatum subsp. capitatum Bonnie Prange 1974-5-4 Colusa Near Clyde Mine 854 Comment
  HSC45714  Dichelostemma capitatum subsp. capitatum Sheila Logan 1978-4-2 69 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  HSC47745  Dichelostemma capitatum subsp. capitatum Thomas W. Nelson, Jane P. Nelson 1978-4-29 3950 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  HSC72165  Dichelostemma capitatum subsp. capitatum J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9540 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  CAS-BOT-BC502550  Dichelostemma congestum Roxana S. Ferris 1926-4-21 6309 Colusa Sycamore Slough near Sycamore Comment
  SD72213  Dichelostemma congestum Eugene Memmler 1969-5-8 105 Colusa Between Williams and Clear Lake, Highway 20. Coastal valley hills. 152 Comment
  UC1053449  Dichelostemma volubile Rimo Bacigalupi and Arthur Holmgren 1950-4-26 3173 Colusa 7.7 mi w Sites (Grapevine Grade to Lodoga); Grapevine Grade Comment
  SEINET3885768  Dichelostemma volubile Richard R. Halse 1989-5-7 3826 Colusa Along the Leesville Road, 3 miles southeast of Leesville; just below the summit of the pass on the east side.; 0 480 Comment
  CHSC94391  Digitaria sanguinalis Lowell Ahart 2006-8-22 13226 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 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
  SEINET199008  Diplacus layneae Helen K. Sharsmith 1953-1 4290 Colusa Mendocino Nat For; In metamorphic rubble of forest clearing, 5 mi beyond Trough Springs on rd to Goat Mt. 1280 Comment
  CHSC60689  Diplacus tricolor Vernon H. Oswald 1993-4-14 5263 Colusa N. side of O'Hair Rd., just E of the headquarters buildings, Colusa National Wildlife Refuge, SW of Colusa. 18 Comment
  CHSC84346  Distichlis spicata Lowell Ahart 2003-8-15 10508 Colusa Road (disked) that bordered a rice field, on the south side of Highway 20, about 1 mile southwest of Williams. 27 Comment
  JEPS108780  Distichlis spicata Lowell Ahart 2006-9-26 13353 Colusa Between the deep ditch and the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell 24 Comment
  JEPS123889  Distichlis spicata Lowell Ahart 2015-4-28 20116 Colusa About 5 1/2 miles east of Maxwell. Comment
  SBBG119745  Distichlis spicata L. Ahart 2006-9-26 13353 Colusa N side of Maxwell Rd, between the deep ditch and the Delevan Nat Wildlife Refuge, ca. 3 mi W of Colusa Princeton Rd, ca. 5.5 mi E of Maxwell 24 Comment
  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
  UCD61442  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
  UCD64488  Distichlis spicata var. stricta K. Esau; D. Hartmann 1941-7-17 Colusa West of Williams. Comment
  CHSC116063  Dodecatheon hendersonii Richard R. Halse 2014-3-25 9030 Colusa Along the Sites-Logoda Road ca. 4.7 miles northeast of Logoda; on the west end of Grapevine Pass. 527 Comment
  SEINET8561748  Dodecatheon hendersonii R. R. Halse 2014-3-25 9030 Colusa W end of Grapevine Pass, along the Sites-Logoda Road, ca 4.7 miles NE of Logoda. 527 Comment
  SEINET215100 Image available Dodecatheon hendersonii Laurie E. Miller 1973-4-15 15 Colusa Walker Ridge hunting access road, 1 mile from State Highway 20. Comment
  UCD118842  Dodecatheon hendersonii subsp. hendersonii Victor Duran 1933-4-3 3378 Colusa Stonyford. 304 Comment
  CHSC60732  Downingia insignis Vernon H. Oswald; Lowell Ahart 1993-5-27 5428 Colusa Sites-Logoda Rd. ca. 0.5 mi NW of Sites in the rolling, grass covered hills bordering the W side of the Sacramento Valley. 121 Comment
  CHSC83635  Downingia insignis L. P. Janeway 2002-4-25 7527 Colusa Sacramento Valley. Vicinity of Funks Creek and Tehama-Colusa Canal. Bottom of drainage. 60 Comment
  UC1609312  Downingia insignis Vernon H. Oswald and Lowell Ahart 1993-5-27 5428 Colusa ca 0.5 mi nw Sites (Sites-Lodoga Rd, Sacramento Valley); Sacramento Valley 121 Comment
  UC76662  Downingia insignis Miss M. Alice King 1905-1-1 Colusa near College City; Sacramento Valley Comment
  UCD55041  Downingia insignis Herbert L. Mason 1953-4-5 14506 Colusa Three miles east of Maxwell. Comment
  UCD55129  Downingia pulchella L. L. Ferwerda 1968-5-4 17 Colusa In Bear Valley; ca. 11 miles northwest of State Highway 20. 408 Comment
  CAS-BOT-BC159697  Drymocallis glandulosa var. glandulosa H. H. Keifer 1928-5-2 s.n. Colusa North Peak, Marysville Buttes Comment
  UCD81726  Dudleya cymosa Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5729 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones Spring area on W side of road, ca. 6.5 road mi N of junction with Hwy 20. W side of road. 864 Comment
  CHSC113133  Dysphania ambrosioides Lowell Ahart 2013-10-1 19088 Colusa Inner North Coast Range. Strand of East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  CHSC94749  Dysphania ambrosioides Lowell Ahart 2006-9-26 13355 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
  CHSC112622  Dysphania pumilio Lowell Ahart 2013-10-1 19086 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
  UCD34847  Echinochloa crus-galli Beecher Crampton 1963-9-9 6893 Colusa 1/4 mile E of Cortena. Comment
  UCD60931  Echinochloa crus-galli Beecher Crampton 1963-9-9 6889 Colusa 1/4 mile E of Cortena, site of UC temporary rice experiment station 1923-1928. Comment
  UCD34845  Echinochloa crus-galli var. crus-galli Beecher Crampton 1963-9-9 6890 Colusa 1/4 mile E of Cortena. Comment
  UCD61064  Echinochloa muricata P. B. Kennedy 30-31 May 1922 Colusa Colusa. Comment
  UCD61073  Echinochloa muricata P. B. Kennedy 1925-9-18 Colusa Cortena. Comment
  UCD61169  Echinochloa oryzoides Hursh 1919-11-12 X 3342 Colusa Williams. Comment
  UCD61170  Echinochloa oryzoides P. B. Kennedy 1925-9-18 Colusa Rice Station, Cortena. Comment
  UCD61175  Echinochloa oryzoides P. B. Kennedy 1928-9-15 Colusa Cortena. Comment
  UCD61177  Echinochloa oryzoides P. B. Kennedy 30-31 May 1922 Colusa Colusa. Comment
  CAS-BOT-BC445569  Echinodorus berteroi Gordon H. True 1974-11-15 7840 Colusa On Delevan Road just west of Four Mile Road, 4 mi. east of Delevan 27 Comment
  UC1245141  Elatine ambigua June McCaskill 1954-8-9 357 Colusa ca 2 mi e Princeton (300 yards s of Glenn Co. line) Comment
  UC1613357  Eleocharis bolanderi Charles M. Belshaw Apr 1937 2888 Colusa vicinity of Cooks Spring, Devils Ridge Inner North Coast Range Comment
  UC1100591  Eleocharis engelmannii Malcolm A. Nobs, S. Galen Smith 1949-9-9 1878 Colusa rice fields 3 mi W of Williams Comment
  CHSC79049  Eleocharis macrostachya J. Marr; C. Warren, H. West 1998-7-1 Colusa West of Maxwell, vicinity of Logan Ridge and Funks Creek, in vernal pool in narrow valley bottom west of ridge. 106 Comment
  SD225710  Eleocharis macrostachya Carol Witham, Jennifer Buck 2001-4-30 156 Colusa 2 miles south of the town of Clusa alng Hwy 20, east of Hwy 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001 Comment
  UCD49740  Eleocharis macrostachya L. P. Janeway 2000-5-31 6776 Colusa Colusa County, California. Inner North Coast Ranges. At Candy Bucket Springs, on the south side of canyon of Stony Creek. 628 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
  CDA38994  Eleocharis parishii L. P. Janeway 2000-5-31 6776 Colusa Inner North Coast Ranges; At Candy Bucket Springs, on the south side of canyon of Stony Creek. Comment
  UCD163346  Eleocharis parishii Craig D. Thomsen 2000-5-11 2352 Colusa Walker Ridge. Buck Flat. 129 Comment
  JEPS75852  Elymus elymoides subsp. elymoides L. R. Heckard 1974-9-10 3896 Colusa East Peak Snow Mt. (e slope) 2103 Comment
  JEPS80181  Elymus elymoides subsp. elymoides L. R. Heckard with J. Hickman 1980-7-3 5333 Colusa just w Summit Springs (ca 10 mi w of Stonyford, sw Snow Mt., Colusa-Lake Co. boundary); Snow Mt. 1548 Comment
  CAS-BOT-BC247093  Elymus glaucus Ellen Dean; G. Harrington; C. Thomsen; Chiao-Yi Cheng; R. Wilmarth 2009-5-20 5673 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
  JEPS76125  Elymus glaucus subsp. glaucus W. L. Jepson 1938-6-11 18991 Colusa on creek 4 mi se Wilbur Springs; Bear Creek Comment
  JEPS80219  Elymus glaucus subsp. jepsonii L. R. Heckard and J. Hickman 1980-7-3 5375 Colusa dry slope above Summit Springs (sw slope of mt.); Snow Mt. 1554 Comment
  UCD67001  Elymus multisetus Craig D. Thomsen 2008-5-23 2738 Colusa BLM Payne Ranch. 0.5 mile south of Hwy 20 (south of Destanella Flat), about 2.5 miles west of Hwy 16. 542 Comment
  POM146492  Elymus multisetus A. A. Heller 1916-6-6 12357 Colusa [No locality specified] Comment
  CDA15477  Elytrigia intermedia subsp. intermedia G. F. Hrusa, T. D. Wilfred 1998-6-19 14614 Colusa North Coast Ranges; Small colony on roadside and up into edge of Adenostoma/Quercus berberidifolia chaparral, above upper Little Stony Creek. Goat Mtn. Rd. ~ 1.5 km. W of of campground. Non-serpentine. Infestation in distinct clumps. Comment
  UCD170129  Emmenanthe penduliflora 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
  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
  CHSC79516  Emmenanthe penduliflora var. penduliflora B. Castro; L. P. Janeway 2000-5-2 1117 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 249 Comment
  JEPS121111  Emmenanthe penduliflora var. penduliflora Lowell Ahart 2013-5-1 18686 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
  JEPS80822  Epilobium L. R. Heckard and J. C. Hickman 1981-7-31 5792 A Colusa e side of mt. Snow Mt., Dark Hollow Creek 1584 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
  CHSC113043  Epilobium ciliatum subsp. ciliatum Lowell Ahart 2013-10-1 19101 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
  SBBG120018  Epilobium ciliatum subsp. glandulosum L. Ahart 2006-8-9 13139 Colusa N side and under the bridge across Stony Crk, just N of Stonyford 347 Comment
  CHSC86819  Epilobium cleistogamum Jenny Marr; Heidi West, Caroline Warren 1998-7-1 Colusa Vicinity of Sites, Golden Gate, Stone Corral Creek, and Funks Creek. Vernal pools. 103 Comment
  CHSC71440  Epilobium densiflorum Vernon H. Oswald; Lowell Ahart 1998-7-15 9303 Colusa West side of county on Walker Ridge Rd. 8.2 mi south of Bartlett Springs Rd., 6.3 mi north of Hwy. 20. In a meadow. 792 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
  JEPS94756  Epilobium densiflorum Vernon H. Oswald and Lowell Ahart 1998-7-15 9303 Colusa 6.3 mi n of Highway 20 (w side of Walker Ridge Road 8.2 mi s of Bartlett Springs Road); Walker Ridge Road 792 Comment
  JEPS80262  Epilobium densiflorum L. R. Heckard and J. Hickman 1980-9-15 5442 Colusa n Summit Springs (n side of road, Lake-Colusa Co. boundary); Snow Mt. 1524 Comment
  UCD82627  Epilobium foliosum Craig Thomsen; G. Harrington 2009-5-12 2898 Colusa Colusa County on Walker Ridge: from spur road about 1/2 mile east of Walker Ridge Road, en route to Eaton Springs. 813 Comment
  UC980843  Epilobium hallianum Kenneth Bradshaw 1953-9-9 Colusa near Board Camp Ridge (w Colusa Co.); Mendocino National Forest, Summit Valley 1676 Comment
  CHSC115385  Epilobium minutum Lowell Ahart 2015-4-1 19998 Colusa Near a small drainage, burned over in 2012, rocky serpentine outcrop on the north side of State Highway 20, 1/2 mile east of Lake County Line, 12 miles (air) east-northeast of Clear Lake (town), 17 miles (air) west of Williams. Inner Coast Range. 520 Comment
  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
  CHSC89862  Epilobium minutum B. Castro; L. P. Janeway 2001-4-18 1236 Colusa Vicinity of Grapevine Creek, Sites-Lodoga Road, and Scotties Spring. On edges of low terrace just above riparian corridor paralleling dirt road, adjacent to perennial N-S-trending creek. 274 Comment
  CHSC91051  Epilobium minutum D. Isle 2003-6-12 365 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. Goat Mt.--meadow 1/4 mi. below road N80 E from jct. of Rd. to Goat Mt. lookout and Horse Glade Rd. GPS: 10S 0524032E 4346780N. 1645 Comment
  CDA38115  Epilobium minutum T. C. Fuller 1958-5-27 s.n. Colusa South of Highway 20, 1 mile west of junction with Highway 16. 0 Comment
  JEPS79752  Epilobium minutum L. R. Heckard and J. C. Hickman 1980-7-2 5302 Colusa trail from Summit Springs to Snow Mt. Peaks (ca 10 mi w of Stonyford, Colusa-Lake Co. boundary); Snow Mtn. 1661 Comment
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Feb 26 2013
  UCD106510  Epilobium minutum Linda A. Bell 1975-4-27 79 Colusa Barlett Springs Road, 1.5 miles E of Bear Valley Road. 609 Comment
  JEPS74981  Epilobium nivium L. R. Heckard 1974-9-11 3953 Colusa along Summit Springs trail Snow Mt. 1737 Comment
  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
  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
  UC1051746  Epipactis gigantea Helen K. Sharsmith 1953-6-21 4302 Colusa Little Stoney Creek Inner North Coast Ranges, Mendocino National Forest (slopes ca 1 mi within boundary of Forest) 670 Comment
  CHSC112010  Epipactis gigantea David Isle 1977-4-23 2079 Colusa Mendocino National Forest. Goat Mtn. Rd. ~1.5 miles W of jct. w/ Lodoga-Stonyford Rd (Co. Rd. 306). On N edge Little Stony Creek. Comment
  CHSC94404  Eragrostis cilianensis Lowell Ahart 2006-8-9 13138 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
  CHSC113050  Eragrostis hypnoides Lowell Ahart 2013-10-1 19077 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
  RSA129661  Eragrostis hypnoides H. S. Yates 1936-8-14 6139 Colusa 3 miles S. of Grimes 15 Comment
  SD262162  Eragrostis hypnoides David Isle, Rhonda Isle 2014-9-27 2143 Colusa Sacramento Valley Foothills: west side East Park Reservoir, 0.3 mile south of boatlaunch. Drying lake bed, c 100 yds east of normal lake edge. 49 Comment
  SEINET200142 Image available Eragrostis hypnoides Herbert L. Mason 1945-9-19 12717 Colusa Below causway over Butte Sink spillway east bank of Sacramento River 1 mile above Colusa Comment
  UCR281728  Eragrostis hypnoides David Isle, Rhonda Isle 2014-9-27 2143 Colusa Sacramento Valley Foothills, west side East Park Reservoir, 0.3 mile south of boatlaunch 49 Comment
  JEPS127604  Eragrostis hypnoides David Isle with Rhonda Isle 2014-9-27 2143 Colusa W side of East Park Reservoir, ca 0.3 miles S of boat launch, ca 100 yards E of normal lake edge. Comment
  UCD63437  Eragrostis minor Tom Aldrich 1968-5-28 Colusa College City area. Comment
  UCR261669  Eriastrum abramsii Ann Howald 2003-5-29 2343 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3.7 miles north of Lodoga, near Chisolm Cove Group Campground 378 Comment
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Dec 15 2016
  UCR261751  Eriastrum abramsii Ann Howald 2003-5-29 2350 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3.7 miles north of Lodoga, near Chisolm Cove Group Campground 378 Comment
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Dec 15 2016
  UC1212582  Eriastrum brandegeeae Francia Chisaki and Helen Sharsmith 1959-5-27 1332 Colusa at Mill Creek crossing on road out of Red Bridge Camp Inner North Coast Ranges Comment
  JEPS123252  Eriastrum tracyi David Gowen 2004-6-23 130 Colusa West of Stonyford near Fouts Springs. Toward the western edge of Davis Flat. Comment
  CHSC89854  Ericameria linearifolia B. Castro; L. P. Janeway 2001-4-18 1238 Colusa Vicinity of Grapevine Creek, Sites-Lodoga Road, and Scotties Spring. On edges of low terrace just above riparian corridor paralleling dirt road, adjacent to perennial N-S-trending creek. 268 Comment
  JEPS31350  Ericameria linearifolia W. L. Jepson 1932-5-9 16294 Colusa n of Stonyford 365 Comment
  JEPS95505  Ericameria linearifolia Vernon H. Oswald and L. Ahart 1994-3-23 6019 Colusa just W of the bridge over Sullivan Creek, S of Stonyford; Goat Mtn. Rd; T16N R7W NE1/4 NW1/4 Sec. 1, 1660 ft, Chaparral. Goat Mtn. Rd. just W of the bridge over Sullivan Creek, S of Stonyford 505 Comment
  RSA293106  Ericameria linearifolia Thomas W. Nelson, Jane P. Nelson 1978-4-1 9527 Colusa Walker Ridge Road, 3.2 miles from its junction with State Route 20 Comment
  JEPS75829  Ericameria nauseosa var. speciosa L. R. Heckard 1974-9-9 3837 Colusa trail up from Summit Springs, Snow Mt., Colusa-Lake County line Snow Mt. 1645 Comment
  JEPS75830  Ericameria nauseosa var. speciosa L. R. Heckard 1974-9-11 3947 Colusa rocky promontory overlooking Fouts Springs, se corner of Snow Mt. Snow Mt., Fouts Springs 1889 Comment
  CHSC94392  Erigeron bonariensis Lowell Ahart 2006-8-22 13225 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS80754  Erigeron inornatus var. inornatus L. R. Heckard and J. C. Hickman 1981-7-29 5721 Colusa Spur, about .75 km se Summit Springs; Snow Mt., Summit Springs 1554 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
  CAS-BOT-BC216003  Eriodictyon californicum L. Constance 1939-5-14 2488 Colusa Above Middle Fork of Stony Creek 2.5 miles east of Bonnie View, Inner North Coast Ranges 518 Comment
  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
  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
  UCD84550  Eriodictyon californicum Ellen Dean; C. Thomsen, T. Hansen, and windfarm meeting 2010-6-11 6148 Colusa Walker Ridge. Along Walker Ridge Road at Cold Spring Mountain radio tower area. 1082 Comment
  CHSC92834  Eriogonum covilleanum D. Isle 2000-6-7 1246 Colusa Mendocino National Forest -- North Coast Ranges Little Stony Creek Watershed. Junction of Frenzel Creek with Little Stony Creek Road. 426 Comment
  CHSC92835  Eriogonum dasyanthemum D. Isle 2000-6-7 1245 Colusa Mendocino National Forest -- North Coast Ranges Little Stony Creek Watershed. Junction of Frenzel Creek with Little Stony Creek Road. 426 Comment
  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
  UC1392809  Eriogonum dasyanthemum R. F. Hoover 1968-5-27 11100 Colusa n, Bear Creek Canyon Highway 20 (near Wilbur Springs); Bear Creek Canyon Comment
  UCD61450  Eriogonum dasyanthemum Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3894 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
  UCR261730  Eriogonum dasyanthemum Ann Howald 2003-5-29 2353 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3.7 miles north of Lodoga, near Chisolm Cove Group Campground 378 Comment
  UCD67672  Eriogonum fasciculatum var. fasciculatum D. Sanchez-Mata 1996-6-20 s.n. Colusa Williams. Blue Ridge. Bear Valley. Bear Creek. Serpentine chaparral. 350 Comment
  CAS-BOT-BC250371  Eriogonum gracile Roxana Stinchfield 1916-6-18 307 Colusa Near College City Comment
  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
  JEPS15558  Eriogonum nervulosum G. Thomas Robbins with L. R. Heckard 1956-7-25 3723 Colusa 1/4 mi s summit Snow Mt. West (ridge forming s extension of Snow Mt. West); Snow Mt. West, Lake-Colusa County Boundary 2103 Comment
  UC1520695  Eriogonum nervulosum R. Raiche 1985-7-27 50667 Colusa Goat Mt. Rd. area Frenzel Creek (headwaters of creek, w of Lodoga) 707 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
  UCD100642  Eriogonum nudum var. nudum Arthur M. Shapiro 1988-8-24 s.n. Colusa near Glenn County Line, at Goat Mountain Lookout, just below summit of Goat Mountain. In Mendocino National Forest. 1865 Comment
  RSA133246  Eriogonum spergulinum var. reddingianum Peter H. Raven, Richard Snow 1959-9-11 14419 Colusa Openings in forest of Pinus ponderosa, Dark Hollow Creek. 1860 Comment
  JEPS75747  Eriogonum strictum var. greenei L. R. Heckard, and R. Bacigalupi 1976-9-6 4422 Colusa above Summit Springs (along trail to Fout's Camp); Colusa-Lake County Line, Snow Mt. 1645 Comment
  UCR44921  Eriogonum tripodum L. F. LaPre 1986-5-30 s.n. Colusa 1.5 mi west of Mendocino National Forest Boundary on Stony Creek Rd [c. 4 mi. west of Stonyford] 671 Comment
  JEPS75864  Eriogonum umbellatum var. bahiiforme L. R. Heckard 1974-9-10 3884 Colusa base of rocky cliff along spur running se West Peak (East Circle Trail); Snow Mt. 2011 Comment
  UCR261723  Eriogonum umbellatum var. smallianum Ann Howald 2003-5-30 2357 B Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, peninsula c. 2 miles north of Lodoga, Big Boot camping area 365 Comment
  UCD101578  Eriogonum wrightii var. subscaposum Arthur M. Shapiro 1988-8-24 s.n. Colusa at the base of Goat Mountain Road, 3.2 miles west of Lodoga. 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
  UCD57823  Eriophyllum lanatum Gordon Harrington 2007-4-17 34 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Destanella Flat, just south of Hwy 20, approximately 3.4 road miles west of the Hwy 16 intersection. 526 Comment
  CAS-BOT-BC308099  Eriophyllum lanatum var. achilleoides Roxana S. Ferris 1926-4-23 6453 Colusa Stonyford Comment
  HSC44471  Eriophyllum lanatum var. achilleoides R. York 1978-4-22 132 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  HSC66004  Eriophyllum lanatum var. achilleoides Teri Bartowski, Shane Feusier, Ruth Takaki, Carol Zimmerer 1980-4-19 39 Colusa 5.4 miles from Lodoga, along Little Stony Creek at Digger Pine Campground Comment
  POM174581  Eriophyllum lanatum var. achilleoides Roxana S. Ferris 1926-4-23 6453 Colusa Stonyford. Comment
  RSA755891  Eriophyllum lanatum var. achilleoides George K. Helmkamp, E. A. Helmkamp 2009-5-20 14755 Colusa Along CA-16, 1.8 miles north of the Yolo County line 271 Comment
  SDSU4094  Eriophyllum lanatum var. achilleoides D. F. Howe 1962-5-19 3283 Colusa 20 miles west of Williams on #20. 396 Comment
  UC896387  Eriophyllum lanatum var. achilleoides A. A. Heller 1916-6-6 12353 Colusa 3 mi w of Leesville (on open gravelly slopes); Coast Range Comment
  UCD132205  Eriophyllum lanatum var. achilleoides Ted C. MacRae 1994-4-30 940430 -1 Colusa 1-1.5 miles northeast of junction of Hwys 20 and 16 along Bear Creek. Comment
  SEINET11850784  Eriophyllum staechadifolium C. L. Abbott 1926-1 s.n. Colusa Colusa Comment
  SEINET8526911  Erodium brachycarpum R. R. Halse 2007-3-22 7107 Colusa Williams; by junction of 5th Street and B Street 25 Comment
  UC35202  Erodium cicutarium J. Burtt Davy May 1898 4281 Colusa near Willows Comment
  UCD57557  Erodium cicutarium Cindy Yip; 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. 304 Comment
  UC73462  Erodium macrophyllum Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley 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
  CAS-BOT-BC211070  Eryngium Roxana Stinchfield 1916-7-9 404 Colusa Along Sacramento River near Sycamore Comment
  CAS-BOT-BC211071  Eryngium Roxana Stinchfield 1916-6-18 309 Colusa R.R. embankment near College City Comment
  CHSC91560  Eryngium aristulatum D. Isle 1995-7-12 397 Colusa Mendocino National Forest--North Coast Ranges. Bear Creek Watershed. BLM land S off Cook Springs. 548 Comment
  UCD82579  Eryngium aristulatum Craig Thomsen 2008-6-12 2769 Colusa Bear Creek (formerly Payne) Ranch. South side of Hwy 20, ca. 0.25 mi W of Hwy 16. West and SW of the corral that is located at the junction of Hwy 16 and 20. Comment
  UC660108  Eryngium aristulatum var. aristulatum Milo S. Baker 1941-7-8 10110 Colusa s. Stony Ford (Valley along Bear Creek); Valley along Bear Creek Comment
  UCD58163  Eryngium aristulatum var. aristulatum Gordon Harrington 2007-6-29 70 Colusa BLM Payne Ranch. Just west of the Hwy 20-Hwy 16 intersection, about 300 feet uphill to the west of the corral. 326 Comment
  UCD61476  Eryngium aristulatum var. aristulatum Gordon Harrington 2007-6-29 70 Colusa BLM Payne Ranch. Just west of the Hwy 20-Hwy 16 intersection, about 300 feet uphill to the west of the corral. 326 Comment
  UCD38844  Eryngium castrense Beecher Crampton 1958-6-26 4976 Colusa along Grieve road, just northeast Hershey R.R. siding, 5.5 miles south of College City. Comment
  CHSC97866  Erysimum capitatum T. C. Fuller; G. D. Barbe 1986-3-6 4260 Colusa Leesville Grade west of Williams. Comment
  UCD64435  Erysimum capitatum Craig D. Thomsen 2001-4-24 2474 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
  CDA34089  Erysimum capitatum P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  SEINET9356866  Erysimum capitatum Unknown 1993-5-2 10856 Colusa Common on open, dry, S facing slopes at mouth of Frenzel Creek, tributary of Little Stony Creek. Comment
  UCD68111  Erysimum capitatum Kathleen A. Robson 1981-5-23 33 Colusa From Stonyford, take Fouts Springs Road 12 miles West, past Fouts Springs to Letts Lake, Mendocino National Forest. Growing on a steep roadcut bank at entrance to lake, on loose dry soil, in full sunlight, individual plants not very abundant in area. Flowers, bright orange. 1219 Comment
  RSA101910  Erysimum capitatum var. capitatum G. B. Rossbach, Ruth P. Rossbach 1938-5-31 851 Colusa About 18 miles W of Williams. Comment
  JEPS120998  Erysimum cheiranthoides Lowell Ahart 2013-5-1 18665 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
  HSC62925  Eschscholzia caespitosa Marla J. Carollo 1979-4-14 36 Colusa Bear Valley Rd., 3.9 mi. N of Hwy. 20 412 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
  CAS-BOT-BC402979  Eschscholzia californica Roxana S. Ferris 1926-4-21 6271 Colusa 2 miles west of Sycamore Comment
  UC71635  Eschscholzia lobbii Miss Alice King 1905-1 Colusa College City Comment
  CHSC70978  Euphorbia crenulata Vernon Oswald; Lowell Ahart 1998-5-7 8994 Colusa Bartlett Springs Rd. 1.6 mi west of Bear Valley Rd. Roadside bank. 487 Comment
  UC1053473  Euphorbia crenulata Rimo Bacigalupi and Arthur Holmgren 1950-4-26 3184 Colusa just w Bear Valley (slope just w of base of grade to Indian Valley (Bartlett Mt. Road)); Inner North Coast Ranges Comment
  UCD163848  Euphorbia crenulata Craig D. Thomsen 2000-5-30 2275 b Colusa Bear Valley. About 7 miles north of Hwy 20. 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
  CHSC59969  Euphorbia spathulata J. M. Tucker 1978-5-6 4407 Colusa In field on east side of Bear Valley Road, 10.6 miles (by road) north of junction with State Highway 20. Valley floor of Bear Valley. 381 Comment
  CHSC79501  Euphorbia spathulata B. Castro; L. P. Janeway 2000-5-2 1110 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 234 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
  UCD58096  Euphorbia spathulata Ellen Dean; C. Thomsen, S. Bledsoe, G. Harrington, D. Hickson 2007-3-25 3473 Colusa BLM Payne Ranch. Lands to the southwest of the intersection of Hwy. 16 and Hwy. 20. Destinella Flat, just E of the Lake County Border. Ca. 3.4 miles along Hwy. 20 from junction of Hwy. 20 and Hwy. 16. 560 Comment
  UCD66873  Euphorbia spathulata Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5076 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. South of junction with trail that heads down to the headwaters of Thompson Creek, upslope of very large stock pond. 629 Comment
  CDA35306  Euphorbia spathulata Vernon H. Oswald & Lowell Ahart 1998-5-7 9002 Colusa Bartlett Springs Road, 2.1 miles west of Bear Valley Road, 0.8 mile east of Sawtelle Valley and Grapevine Flat Roads. Comment
  UCD82371  Euphorbia spathulata Robin McMaster 1973-4-15 344 Colusa 0.5 mi towards Bartlett Springs from Bear Valley Road. Comment
  UCD81254  Euthamia occidentalis Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5419 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. 312 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
  UCD82573  Extriplex joaquinana Craig Thomsen 2008-6-12 2764 Colusa Walker Ridge, near Elgin Mine on Lucientes property. 655 Comment
  UC2016538  Festuca bromoides Richard Olmstead 1984-4-29 530 Colusa On slopes by Walker Ridge Road 2.4 mi N of Calif. 20. Road follows ridge that is Lake/Colusa Co. line. Comment
  JEPS80815  Festuca elmeri L. R. Heckard and J. C. Hickman 1981-7-31 5788 Colusa e side Snow Mt. (trail from Foutch Camp to Box Springs) 1524 Comment
  CHSC112208  Festuca microstachys var. microstachys Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18696 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
  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
  JEPS81295  Festuca roemeri L. R. Heckard and J. C. Hickman 1982-7-5 5909 Colusa below Summit Springs; Snow Mt. 1524 Comment
  HSC48195  Frangula californica subsp. californica Thomas W. Nelson, Jane P. Nelson 1978-4-29 3961 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  SEINET7417533 Image available Frangula californica subsp. crassifolia E. Lee 1936-12-13 2612 Colusa Stonyford-Lodoga Road Comment
  UCD146604  Frangula californica subsp. crassifolia G. F. Hrusa 1998-6-19 14599 Colusa North Coast Ranges. Along Little Stony Creek. Goat Mountain Road, around 1 km west of intersection with Lodoga-Stonyford Road. 415 Comment
  CAS-BOT-BC62918  Frangula californica subsp. tomentella C. Hart Merriam 1919-9-15 s.n. Colusa Stony Ford, nw. Colusa Co. Comment
  CAS-BOT-BC62920  Frangula californica subsp. tomentella C. Hart Merriam 1907-7-23 s.n. Colusa Cook Spgs. Comment
  HSC48172  Frangula californica subsp. tomentella Thomas W. Nelson, Jane P. Nelson 1978-4-29 3936 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  UCD163874  Frangula californica subsp. tomentella Craig D. Thomsen 2000-5-11 2395 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
  UCD58175  Frangula californica subsp. tomentella Gordon Harrington 2007-5-31 67 Colusa BLM Payne Ranch. Lands to the SW of the intersection of Hwy 16 and Hwy 20. Along Thompson Creek, approximately 3/4 mile downstream from Road Kill Cafe. 357 Comment
  CHSC46874  Frankenia salina Vernon Oswald 1989-9-12 4011 Colusa Maxwell-Colusa Rd 1.9 mi e of Maxwell, just w of Two-Mile Rd. On upper bank of roadside ditch. 33 Comment
  CHSC36175  Fraxinus dipetala Robert A. Schlising 1978-4-10 3218 Colusa Grapevine Pass, on Sites--Lodoga Road. 562 Comment
  JEPS15265  Fritillaria affinis Rimo Bacigalupi 1950-4-16 3102 Colusa above and n of Red Bridge Camp (between and above the confluence of the North and Middle Forks of Stony Creek, very close to Glenn County Line, easternmostr ridges of the Inner); Inner North Coast Ranges, Mendocino National Forest 579 Comment
  UCD110806  Fritillaria affinis Christopher Mallek 2008-1 s.n. Colusa Pacific Ridge. Border of Colusa and Lake Counties. 1101 Comment
  UCD112596  Fritillaria affinis Christopher Mallek 2008-4-17 WR2- 6 Colusa Walker Ridge. Border of Colusa and Lake Counties. 802 Comment
  UCSC010486  Fritillaria affinis Dylan M. Neubauer, Tim Forsell 2016-3-31 598 Colusa (NCoRI) Walker Ridge, Walker Ridge Road, 1.96 air-miles sse Cold Spring Mountain 820 Comment
  CAS-BOT-BC130339  Fritillaria glauca Donald V. Hemphill 1956-5-26 s.n. Colusa 1/4 mi. south of Snow Mt. East 2103 Comment
  CAS-BOT-BC130437  Fritillaria pluriflora Arthur Menzies; Barbara Menzies 1968-3-22 s.n. Colusa Bear Valley (Between Wilbur Springs & Leesville) Comment
  JEPS42811  Fritillaria pluriflora Wayne Roderick 1966-3-26 Colusa 1/2 mi e of Robbers Flat (adjacent to Bartlett Springs Road, Bear Valley); Bear Valley 417 Comment
  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
  UCR261676  Fritillaria pluriflora Ann Howald 2003-3-25 2283 Colusa Inner North Coast Ranges, Indian Valley, west side of East Park Reservoir, c. 1.5 miles southeast of Stonyford, just south of cattle guard at entrance to recreation area 364 Comment
  UCR261677  Fritillaria pluriflora Ann Howald 2003-3-25 2282 Colusa Inner North Coast Ranges, Indian Valley, west side of East Park Reservoir, c. 2 miles southeast of Stonyford, near turnoff to boat launch 374 Comment
  SEINET10469567  Fritillaria pluriflora Mary Susan Taylor, J. Lacey 1982-4-14 Taylor 4344 Colusa In deep adobe clay, both sides of Stonyford Cemetary Lane, ca. 1.5 mi w of Stonyford, s of Fouts Springs Rd. 1200 ft. 365 Comment
  UCSB24339  Fritillaria pluriflora Roderick, Wayne 1966-3-26 Colusa Bear Valley, beside Bartlett Springs Road, 1/2 mile east of Robbers Flat Comment
  JEPS15271  Fritillaria purdyi Rimo Bacigalupi with G. L. Stebbins, C. McMillan and Peter Kamb 1950-4-16 3107 Colusa between and above confluence of the North and Middle Forks of Stony Creek, very close to Glenn Co. line, above and n of Red Bridge Camp [Mend. Nat. Forest] Stony Creek; innermost ridges of Inner North Coast Ranges 579 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
  HSC48146  Galium andrewsii Thomas W. Nelson, Jane P. Nelson 1978-4-30 3967 Colusa Along Hwy. 20, E of Colusa-Lake county line 549 Comment
  UCD66537  Galium andrewsii Craig D. Thomsen 2001-5-24 2496 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  JEPS52784  Galium andrewsii subsp. andrewsii Lauramay T. Dempster and G. L. Stebbins 1967-4-8 4356 Colusa Bartlett Springs road 2.5 mi w Leesville (1.8 mi w of junction with Bear Valley Rd, w-facing slope) 530 Comment
  JEPS80799  Galium andrewsii subsp. andrewsii L. R. Heckard and J. C. Hickman 1981-7-30 5769 Colusa about 100 ft above on n side Trout Creek (se side of mt); Snow Mt. 1554 Comment
  JEPS52810  Galium andrewsii subsp. intermedium Lauramay T. Dempster and G. L. Stebbins 1967-4-8 4357 Colusa 2.7 mi by road ne Lodoga (s-facing roadbank) 396 Comment
  UCD64437  Galium aparine Craig D. Thomsen 2000-3-31 2070 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
  JEPS80809  Galium bolanderi L. R. Heckard and J. C. Hickman 1981-7-31 5781 Colusa rocky promontory called Fouts Spring Overlook Snow Mt. (e side of mt) 1783 Comment
  UC1562568  Galium californicum subsp. californicum Barbara Ertter 1989-7-1 8604 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
  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
  RSA170254  Galium nuttallii subsp. nuttallii J. T. Gregory 1936-3-29 1068 Colusa Climbing over oaks, SE side Cobb Mt. near top on road from Middletown Comment
  CHSC79906  Galium parisiense B. Castro; L. P. Janeway 2000-5-4 1130 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 246 Comment
  CHSC94525  Galium parisiense Lowell Ahart 2006-8-9 13149 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS21477  Galium parisiense Francia Chisaki and Gene B. Newcomb 1958-6-19 1134 Colusa ca 3 mi w Stonyford (along path leading to the dam); Diversion Dam Camp Comment
  UCD56666  Galium porrigens Jack Alderson 2007-3-25 2 Colusa BLM Payne Ranch. Destinella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 555 Comment
  UCD81242  Galium porrigens var. tenue Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5406 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Inside canyon that is located to the south of Brophy Canyon. 292 Comment
  UCR227343  Galium porrigens var. tenue Craig D. Thomsen 2001-5-24 2457 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, south side of Hwy 20, c. 0.5 mi west of Hwy 20/16 intersection (between mileposts 2.17 and 2.63) 325 Comment
  UCD121911  Galium porrigens var. tenue Elaine J. Imada 1971-4-10 15 Colusa East side of ridge; Bear Valley, Walker Ridge. Comment
  POM96840  Galium tricornutum E. Johnson 1926-5-5 s.n. Colusa [Unspecified] Comment
  CDA34117  Galium trifidum P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 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
  CHSC22851  Garrya congdonii Robert A. Schlising 1962-1-31 2031 Colusa Coast Ranges. Along Stoney Creek. 441 Comment
  UCD121094  Garrya congdonii D. Sanchez-Mata 1998-7-9 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain Road between Lodoga and Red Rock Cabin. 450 Comment
  OBI14152  Garrya veatchii Rimo Bacigalupi, G. T. Robbins 1954-6-25 4623 Colusa 1/2 mi E of summit (Lake-Colusa County line) on rd from Indian Valley (Lake County) to Bear Valley (Colusa County) 549 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
  UCD103294  Geranium carolinianum Beecher Crampton 1958-5-19 4806 Colusa west of Lodoga, Little Stony Creek Canyon. 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
  UC1613427  Gilia Charles M. Belshaw April 1937 2869 Colusa vicinity Cook's Spring (Devil's Ridge); Inner Coast Range, Devil's Ridge Comment
  CDA15474  Gilia capitata subsp. mediomontana G. F. Hrusa, WTD 1998-6-19 14611 Colusa North Coast Ranges; Above upper Little Stony Creek. Goat Mtn. Rd. ~ 1.5 km. W of of campground. Comment
  UC73637  Gilia clivorum Miss M. Alice King 1905-1 Colusa near College City (Sacramento Valley); , near College City Comment
  CHSC27514  Gilia tricolor Michael F. Henetz 1978-4-15 10 Colusa Field ca. 150 m s of Hwy. 20, ca. .5 km w of junction of Hwy. 20 and Hwy. 16, ca. 29 km s of Williams 322 Comment
  POM282251  Gilia tricolor Lyman Benson 1929-3-26 1043 Colusa Wilbur Springs Comment
  HSC71310  Gilia tricolor Thomas W. Nelson, Jane P. Nelson 1979-4-11 4615 Colusa Along Leesville to SR 20 cutoff 5 mi. E of Leesville Comment
  UCD14374  Gilia tricolor L. Coats 1983-4-24 11 Colusa Colusa Co.; in the hills at the south end of Bear Valley, along Bear Valley Road, 6.3 miles south of Bartlett Springs Road; 487 Comment
  UC1563931  Glinus lotoides Barbara Ertter with Elizabeth Neese, Laura Fujii, Dawn Espindola 1989-10-21 8871 Colusa n of Lodoga (se end of East Park Reservoir); East Park Reservoir 365 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
  JEPS75872  Glyceria elata L. R. Heckard 1974-9-9 3874 Colusa se of Foutch Camp (just ne of rock promontory); Snow Mt. 1920 Comment
  RSA724833  Gnaphalium californicum L. Ahart 2006-6-15 12791 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
  UCR225394  Gnaphalium californicum Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5099 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20. Western part of ranch along ridge trail at Cache Creek Canyon, just south of junction with trail that leads east to Brophy Canyon and Thompson Creek 495 Comment
  CAS-BOT-BC303890  Gnaphalium palustre Roxana Stinchfield 1916-7-9 409 Colusa Phillips Ranch Comment
  CHSC94475  Gnaphalium palustre Lowell Ahart 2006-8-9 13124 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  POM53851  Gnaphalium palustre Roxana Stinchfield 1916-6-17 289 Colusa At Tule levee, College City. Comment
  UCR227904  Gnaphalium palustre Ellen Dean 2008-6-8 5064 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20. Northwest corner of ranch, along ridge trail on the border of Lake and Colusa counties. East side of trail around stock pond 610 Comment
  UCD58174  Grindelia camporum var. camporum Gordon Harrington 2007-5-31 66 Colusa BLM Payne Ranch. Lands to the SW of the intersection of Hwy 16 and Hwy 20. Along Thompson Creek, approximately 3/4 mile downstream from Road Kill Cafe. 357 Comment
  JEPS113893  Grindelia hirsutula L. P. Janeway 2007-6-17 9059 Colusa Inner North Coast Ranges; Along Bear Valley Road and Bear Creek near Hwy 20. 325 Comment
  UC71784  Grindelia hirsutula H. P. Chandler 1905-9-14 Colusa Princeton Comment
  CHSC97316  Grindelia hirsutula var. davyi L. P. Janeway 2007-6-17 9059 Colusa Inner North Coast Ranges. Along Bear Valley Road and Bear Creek near Hwy 20. 325 Comment
  CHSC97317  Grindelia hirsutula var. davyi L. P. Janeway 2007-6-17 9058 Colusa Inner North Coast Ranges. Along Bartlett Springs Road between Bear Valley and Walker Ridge Road. 530 Comment
  JEPS80118  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
  UCD37233  Hainardia cylindrica Beecher Crampton 1958-6-27 4988 Colusa Colusa County, 3.5 miles south of Colusa. Comment
  UCD85141  Hainardia cylindrica Beecher Crampton 1953-4-29 1143 A Colusa Colusa County, 2 miles east of Maxwell. Comment
  JEPS94706  Harmonia hallii Vernon Oswald and Lowell Ahart 1998-5-7 9012 Colusa Bartlett Springs Road 2.8 mi w of Bear Valley Road (0.1 mi e of Sawtelle Vallyy and Grapevine Flat Roads); Bartlett Springs Road 633 Comment
  UC1731328  Harmonia hallii Dean W. Taylor 1998-6-23 16703 Colusa Walker Ridge North Coast Ranges (along access road) 929 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
  UCD70304  Helenium puberulum D. Sanchez-Mata 1998-7-10 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain Road between Lodoga and Red Rock Cabin. 420 Comment
  CAS-BOT-BC309381  Helenium puberulum Roxana Stinchfield 1916-7-8 393 Colusa Bed of Sycamore Slough near Sycamore Comment
  CAS-BOT-BC309382  Helenium puberulum Volney Rattan 1877-6-26 s.n. Colusa Sulphur Creek Comment
  UC924977  Helianthus bolanderi Annetta Carter 1951-8-26 3079 Colusa Southwest of Leesville (hills at the w side of Bear Valley); North Coast Ranges, Bear Valley 450 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
  UCD61457  Helianthus bolanderi Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3903 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1 mile SW of parking lot. 390 Comment
  CHSC89839  Heliotropium curassavicum B. Castro; L. Janeway 2001-5-10 1250 A Colusa Vicinity of Grapevine Creek, Antelope Creek, and Pence Mtn. At side of dirt road paralleling N-S-trending perennial creek. 381 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
  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
  UCD70229  Heliotropium curassavicum var. oculatum 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
  CHSC107283  Helminthotheca echioides L. P. Janeway; B. Castro 2011-7-9 10507 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 1.5 km southeast of Funks Reservoir and 0.1-0.6 km northeast of Te-hama-Colusa Canal. 50 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
  UCD163661  Hemizonia congesta Craig Thomsen 1998-6-10 1958 Colusa Bear Valley. About 6 miles north of Hwy 20. Comment
  JEPS12555  Hemizonia congesta subsp. clevelandii R. F. Hoover 1938-6-11 3596 Colusa Williams-Lake Co. hwy at junction Wilbur Sprs. road 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
  UC725797  Hemizonia congesta subsp. luzulifolia A. A. Heller 1939-10-1 15482 Colusa between Williams Maxwell Comment
  UCD159329  Hemizonia congesta subsp. luzulifolia D. S. Park 2010-6-5 113 Colusa Colusa County.: Walker ridge, Cold Spring Mt. roadside, grassland. 781 Comment
  UCD61435  Hemizonia congesta subsp. luzulifolia Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3880 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
  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
  UCD61455  Hemizonia congesta subsp. luzulifolia Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3901 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Just north of the headwaters of Eula Canyon. 339 Comment
  UCD64038  Hemizonia congesta subsp. luzulifolia Craig D. Thomsen 2000-6-23 2415 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
  CHSC80150  Hemizonia parryi subsp. parryi B. Castro; G. Kuenster 2000-7-19 1202 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. 41 Comment
  HSC103568  Hemizonia pungens Thomas W. Nelson, Jane Nelson 1983-8-13 7596 Colusa At rest stop just south of Maxwell Comment
  JEPS80774  Heracleum lanatum L. R. Heckard and J. C. Hickman 1981-7-30 5747 Colusa s.e. slope Snow Mt. (Trout Creek trail); , Trout Creek trail 1645 Comment
  UCR261650  Herniaria hirsuta var. cinerea Ann Howald 2003-4-24 2317 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
  UC88271  Hesperevax caulescens B. 1889-1-1 Colusa Colusa Comment
  UCD82529  Hesperolinon Craig Thomsen; G. Harrington 2009-5-12 2885 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. East-facing hillslope above (west border) Eaton Springs meadow complex. 710 Comment
  UCD82619  Hesperolinon Craig Thomsen; G. Harrington 2009-5-12 2887 b Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  CHSC48598  Hesperolinon californicum Vernon Oswald 1986-5-12 2010 Colusa Brim Rd. (Bartlett Springs Rd.) 2.1 mi w of Bear Valley Rd. Common in a grassy opening on a serpentine slope. 487 Comment
  UC1212442  Hesperolinon californicum Herbert L. Mason 1946-5-31 12815 Colusa 1 mi e Lake County line (Bartlett Springs to Williams road, western Colusa County); Inner North Coast Ranges Comment
  UC1212465  Hesperolinon californicum Helen K. Sharsmith 1959-5-27 4695 Colusa foot grade on Lower Lake to Williams road (w side of valley); Inner North Coast Ranges, Bear Valley 426 Comment
  UCD63908  Hesperolinon californicum Craig D. Thomsen 2000-6-23 2382 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection (between Colusa Co. mileposts 2.17 and 2.25). 342 Comment
  CAS-BOT-BC175983  Hesperolinon californicum T. S. Brandegee 1884-6-1 s.n. Colusa Unspecified Comment
  CDA28489  Hesperolinon californicum T. C. Fuller 1958-6-16 Colusa Hillside above Highway 20, 2 miles west of Cache Creek Bridge. 0 Comment
  CHSC106245  Hesperolinon disjunctum B. Castro; L. P. Janeway 2001-6-3 1258 A 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
  CHSC112217  Hesperolinon disjunctum Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18635 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
  JEPS110118  Hesperolinon disjunctum Lowell Ahart 2006-6-11 12675 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
  UC1212497  Hesperolinon disjunctum Helen K. Sharsmith 1951-7-13 4031 Colusa near Mill Creek at junction with road to Black Diamond Ridge; Inner North Coast Ranges, Mendocino National Forest, Fouts S 457 Comment
  UC1212515  Hesperolinon disjunctum Herbert L. Mason 1952-6-19 14301 Colusa slope between Fouts Springs Red Bridge Public Camp; Inner North Coast Ranges, Mendocino National Forest Comment
  UCR148797  Hesperolinon disjunctum Daniel Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley, Bear Valley Road, Bear Valley Creek 372 Comment
  UCR263626  Hesperolinon disjunctum Lowell Ahart 2006-6-11 12675 Colusa east side of an off road trail (Trail 30), c. 100 yards south of Fouts Road, c. 5 road miles west of Stonyford 613 Comment
  CAS-BOT-BC176221  Hesperolinon disjunctum Helen K. Sharsmith 1953-6-18 4254 Colusa One mile beyond Wolf Glade on spur road, drainage of Stoney Creek, Mendocino National Forest 609 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
  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
  JEPS81347  Heuchera micrantha var. pacifica L. R. Heckard and J. C. Hickman 1982-7-7 5958 Colusa nw side Snow Mt (Crooked Tree Ridge) 1935 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
  POM312312  Hibiscus H. L. Mason 1945-7-11 12649 Colusa Alkali plains near Butte Creek; Butte Lodge Outing Club, three miles above Colusa Comment
  RSA63370  Hibiscus lasiocarpos Milo S. Baker 1946-9-4 11608 Colusa Butte Sink, near gate of Colusa Gun Club Comment
  RSA93450  Hibiscus lasiocarpos Milo S. Baker 1946-9-4 11608 Colusa Butte Sink, near gate of Colusa Gun Club Comment
  CDA38628  Hibiscus trionum Ken Flagor 2012-8-28 PDR# 060 P089080 Colusa North of Maxwell; north of Lenahan Road, south of Delevan Road, west of Sutton Road, east of McDermott Road. 0 Comment
  JEPS73514  Hieracium albiflorum L. R. Heckard 1972-7-10 3132 Colusa 3 mi nw Fouts Springs (near promontory on se corner of Snow Mt.); Snow Mt. 1828 Comment
  UC1183425  Hippuris vulgaris J. M. Tucker and L. K. Mann 1959-5-30 3528 Colusa ca. 1/4 mi. n.w. Lower Letts Valley (and ca. 4 mi. (airline) n. of Goat Mt. Lookout, Mill Valley); Mill Valley 1219 Comment
  UCD163858  Hoita macrostachya Craig D. Thomsen 2001-5-31 2538 Colusa Bear Creek Canyon south of Sulphur Creek confluence. About 3 miles north of Hwy 20. Comment
  UCD164149  Hoita macrostachya Craig Thomsen 1997-6-21 1930 Colusa Bear Valley. About 8 miles north of Hwy 20. Comment
  CAS-BOT-BC320320  Holocarpha virgata Volney Rattan 1884-6-1 s.n. Colusa Stony Creek Colusa. Coast Mts. North of San Francisco Bay Comment
  CAS-BOT-BC320322  Holocarpha virgata Gordon H. True 1962-12-8 1128 Colusa 7 miles west of Arbuckle 152 Comment
  HSC10153  Hordeum brachyantherum C. R. Phillips 1964-3-30 Colusa Colusa, vacant lot Comment
  UCD164138  Hordeum brachyantherum Craig Thomsen 1997-4-20 1927 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCD20203  Hordeum brachyantherum J. McCaskill 1963-5-12 s.n. Colusa Bear Valley, on road from State Hwy 20 to Leesville, 12.2 miles north of junction of Hwys 20 and 16. Comment
  CHSC106241  Hordeum brachyantherum subsp. californicum B. Castro; L. P. Janeway 2001-6-3 1260 Colusa Inner North Coast Ranges. 'Til Jones Spring' at headwaters of Freshwater Branch of E. Fork Sulphur Ck, 0.6 mi E of top of Walker Ridge. Ca 3 air mi W of S end of Bear Valley, and 1.75 air mi SSE of Cold Spring Mtn. Just downslope from Walker Ridge Rd., in opening in surrounding serpentine chaparral. 822 Comment
  JEPS475  Hordeum brachyantherum subsp. californicum W. L. Jepson 1938-6-9 18956 Colusa w slope of mountains between Indian Valley, Lake County and Bear Valley, Colusa County; Indian Valley, Bear Valley 579 Comment
  UCD18853  Hordeum depressum Vernal Pool Team 2001; Carol Witham and Jennifer Buck 2001-4-30 161 Colusa 2 mi. south of the town of Colusa along Hwy 20, east of Hwy 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001, UTMs: 10S0587786; 4336302. Comment
  CHSC53989  Hordeum jubatum Vernon H. Oswald 1991-4-21 4526 Colusa Four Mile Rd, 1.9 mi north of Maxwell Colusa Rd. Roadside ditches in area of rice fields. 27 Comment
  SEINET9320843  Hordeum jubatum Unknown 1998-7-9 Colusa Bear Valley Comment
  CHSC107159  Hordeum marinum subsp. gussoneanum L. P. Janeway; B. Castro 2011-4-27 10244 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. North edge of large wetland. 49 Comment
  CHSC107165  Hordeum marinum subsp. gussoneanum L. P. Janeway; B. Castro 2011-4-27 10243 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. North edge of large wetland. 49 Comment
  CHSC83705  Hordeum marinum subsp. gussoneanum L. P. Janeway 2002-4-24 7520 Colusa Sacramento Valley/Inner North Coast Ranges border. Vicinity of Logan Ridge, Stone Corral Creek, and Funks Creek. 103 Comment
  CAS-BOT-BC284750  Hordeum murinum subsp. glaucum Roxana S. Ferris 1917-4-12 515 Colusa 4 miles East of Williams Comment
  JEPS80245  Horkelia californica subsp. dissita L. R. Heckard and J. Hickman 1980-9-15 5420 Colusa w Summit Springs (Snow Mt.); , w of Summit Springs 1554 Comment
  CAS-BOT-BC383133  Horkelia tenuiloba Andrew Townesmith; Karen M. Meyer 2007-8-7 915 Colusa Mendocino National Forest, Grindstone Ranger District. Lily Pond, off Forest Service road 17N02, 1.7 miles SW of intersection with Forest Service route M10 1264 Comment
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Aug 17 2018
  SEINET10947309  Horkelia tenuiloba Andrew Townesmith, Karen M. Meyer 2007-8-7 Townesmith 915 Colusa Mendocino National Forest, Grindstone Ranger District. Lily Pond, off Forest Service road 17N02, 1.7 miles SW ofinteresection with Forest Service route M10. T17N R8W S24. 1264 Comment
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Aug 17 2018
  UCD67123  Hosackia oblongifolia Ellen Dean; Davis Botanical Society 2008-5-31 5055 Colusa west of I-5 at Maxwell, north slope of Goat Mountain, along Letts Valley Rd. between Goat Mountain Summit and Fouts Springs. 787 Comment
  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
  SEINET255491  Hypochaeris glabra Richard R. Halse 2007-3-25 7122 Colusa Along State Hwy. 20 ca. 7.8 miles northeast of its junction with State Hwy. 16, at base of Salt Canyon. 100 Comment
  UCD57282  Hypochaeris glabra Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3650 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
  RSA0013871  Ibicella lutea Richard Snow 1958-8-3 671 Colusa Near State Highway 20, on the road to Leesville. Comment
  HSC31612  Iris macrosiphon Maralyn O'Meara, Gary S. Lester 1974-5-4 342 Colusa Walker Ridge Rd., 0.7 mi. from junction with Little Indian Valley Rd. 854 Comment
  JEPS94211  Iris macrosiphon Vernon Oswald and Lowell Ahart 1998-5-7 9008 Colusa Bartlett Springs Road 2.2 mi w of Bear Valley Road (0.7 mi e of Sawtelle Valley and Grapevine Flat Roads); Bartlett Springs Road 524 Comment
  RSA256676  Iris macrosiphon Maralyn O'Meara, Gary S. Lester 1974-5-4 342 Colusa Walker Ridge Road, ca. 0.7 mile from junction with Little Indian Valley Road 854 Comment
  UCD82523  Iris macrosiphon Craig Thomsen; G. Harrington 2009-5-12 2880 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. East- facing hillslope above (west border) Eaton Springs meadow complex. 722 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
  JEPS80778  Iris missouriensis L. R. Heckard and J. C. Hickman 1981-7-30 5751 Colusa se side Snow Mt. (Trout Creek trail); , Trout Creek 1615 Comment
  UCD163714  Iva axillaris Craig Thomsen 1999-5-10 2007 Colusa Colusa County. In canyon between Wilbur Springs Bridge and Bear Valley. About 4 miles north of Hwy 20. Comment
  UCD63772  Iva axillaris Craig D. Thomsen 2008-3-30 2723 Colusa BLM Payne Ranch. Southwest of intersection of Hwy 16 and Hwy 20, 0.25 mile west of Hwy 16, about 1 mile south of Hwy 20. Comment
  CHSC86845  Juglans californica var. hindsii B. Castro 2003-4-3 1414 Colusa Vicinity of Sites, Golden Gate, and Funks Ck. In bottom of old channel of creek, near farm buildings. 79 Comment
  UCD61468  Juncus balticus subsp. ater Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3914 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1/2 mile south of parking lot, along Bear Creek. 312 Comment
  CHSC88538  Juncus bufonius var. congestus B. Castro 2003-5-15 1437 Colusa Vicinity of Logan Ridge, Sulphur Gap and Lurline Creek. At edge of stock pond. 196 Comment
  JEPS110176  Juncus ensifolius Lowell Ahart 2006-8-9 13145 Colusa North side and just east of the bridge across Stony Creek, just north of Stonyford 347 Comment
  UCD18851  Juncus mexicanus Vernal Pool Team 2001; Carol Witham and Jennifer Buck 2001-4-30 159 Colusa 2 mi. south of the town of Colusa along Hwy 20, east of Hwy 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001, UTMs: 10S0587786; 4336302. Comment
  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
  CHSC90870  Juncus phaeocephalus D. Isle 2002-6-28 176 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. Below a 4x4 Rd. 17N31 (Lovelady Ridge Jeep Rd.). 1060 Comment
  CDA31986  Juncus usitatus L. Ahart 2007-7-7 14258 Colusa South of the wire fence, on the south side of the Gridley Colusa Highway, about 1 1/4 miles east of River Road, about 17 miles west of Gridley. Comment
  HSC100768  Juncus usitatus Lowell Ahart 2007-7-7 14258 Colusa S side of the Gridley-Colusa Hwy., ~1 1/4 mi. E of River Rd. and 17 mi. W of Gridley. 20 Comment
  UCD169280  Juncus usitatus Lowell Ahart 2007-7-7 14258 Colusa About 17 miles west of Gridley, About 1 1/4 miles east of River Road, on the south side of the Gridley Colusa Highway, south of the wire fence. 20 Comment
  CHSC91664  Juncus xiphioides G. D. Barbe; Nola Parmer 1982-6-4 3638 Colusa Sacramento Valley. Along Goat Mountain Road, w of Lodoga-Stonyford Rd., Mendocino National Forest. Comment
  JEPS118670  Juncus xiphioides L. P. Janeway and B. Castro 2011-5-19 10289 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 1.9 km southeast of Funks Reservoir and 0.2 km northeast of Tehama-Colusa Canal. Comment
  UCD163648  Juncus xiphioides Craig Thomsen 1998-6-19 1944 Colusa Bear Valley. About 8.5 miles north of Hwy 20. Comment
  CAS-BOT-BC80913  Juniperus californica Roxana S. Ferris 1926-4-23 6456 Colusa 4 miles from Stanford on the Leesville Road Comment
  CHSC43541  Juniperus californica Lowell Ahart 1976-2-14 1005 Colusa About 3 miles west of Sites. 365 Comment
  UCD63029  Juniperus californica Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4681 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. 501 Comment
  CHSC65613  Juniperus occidentalis J. Ingraham 1995-4-13 6 Colusa 1 mi N of Davis Creek on hwy 395, 100 yds. E of junction of Co. Rd. 133B and Hwy 395, 100 yds E. 1487 Comment
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Jul 25 2018
  CHSC94282  Keckiella corymbosa Lowell Ahart 2006-8-9 13102 Colusa On the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 422 Comment
  JEPS73509  Keckiella corymbosa L. R. Heckard 1972-7-10 3127 Colusa 3 mi nw and overlooking Fouts Springs (se corner of Snow Mt); Snow Mt. 1828 Comment
  UCD72539  Keckiella lemmonii Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3830 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. East side of Bear Creek, just south of BLM parking lot (ca. 10 miles). 252 Comment
  JEPS73503  Kelloggia galioides L. R. Heckard 1972-7-10 3121 Colusa near Trout Crossing of trail to Box Springs (Snow Mt.); Snow Mt. 1828 Comment
  UC637057  Kickxia elatine Edward Lee 1934-8-9 1011 Colusa 4 mi n Willows; Sacramento Valley Comment
  UCD164166  Koeleria macrantha Craig Thomsen 2001-5-6 2558 Colusa Wilbur Hot Springs. Comment
  CHSC107936  Lactuca saligna B. Castro; L. Janeway 2011-7-9 1892 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; approximately 1 mi southeast of Funks Reservoir and 0.25 mi northeast of Tehama-Colusa Canal. In N end of swale about 700 ft north of large +- alkaline marsh. 49 Comment
  RSA724937  Lagophylla minor L. Ahart 2006-6-11 12667 Colusa On the east side of an off road trail (Trail 30) about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford 613 Comment
  UC596300  Lagophylla minor R. F. Hoover 1938-4-24 3226 Colusa ridge between Venado and Leesville Comment
  UC89194  Lagophylla minor K. Brandegee Apr 1889 Colusa near Leesville Comment
  UCD163715  Lagophylla minor Craig Thomsen 1999-5-10 2027 Colusa Colusa County. BLM Bear Creek Ranch. Near intersection of Hwy 16 and Hwy 20. About 0.5 miles south of Hwy 20. Comment
  UCD82162  Lagophylla minor Ellen Dean; G. Harrington, C. Thomsen,R. Wilmarth,Chiao-Yi Cheng 2009-5-20 5694 Colusa Walker Ridge. Til Jones Spring area along Walker Ridge Road. 833 Comment
  CAS-BOT-BC341397  Lagophylla minor A. A. Heller 1940-5-6 15578 Colusa On State Highway #20, 2 miles west of the junction with Highway #16 Comment
  JEPS38990  Lagophylla minor W. L. Jepson 1938-6-9 18959 Colusa mts. betw. Indian Valley (Lake Co.) and Bear Valley (Colusa Co.) 579 Comment
  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
  SBBG128767  Lagophylla minor L. Ahart 2013-5-1 18680 Colusa near a small drainage, N of the wash and 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
  JEPS80244  Lagophylla ramosissima L. R. Heckard and J. Hickman 1980-9-15 5419 Colusa slopes w of Summit Springs; Snow Mt. 1554 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
  HSC48034  Lasthenia californica Thomas W. Nelson, Jane P. Nelson 1978-4-29 3939 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  UCD23380  Lasthenia californica subsp. californica George C. Ziobro 1978-4-8 2 Colusa collected off of Bear Valley Road 10.3 miles north of the junction with State Route 20. 396 Comment
  CAS-BOT-BC352923  Lasthenia glaberrima J. M. Tucker 1978-5-6 4408 Colusa West side of Bear Valley Road, 11 miles (by road) north of junction with State Hwy 20 396 Comment
  SEINET5712846  Lasthenia glaberrima J. M. Tucker 1978-1 4408 Colusa West side of Bear Valley Road, 11 miles (by road) north of junction with State Hwy 20. 366 Comment
  UCD163703  Lasthenia glabrata Craig Thomsen 1999-5-10 2015 Colusa Bear Valley. About 9 miles north of Hwy 20. Comment
  UCR261737  Lasthenia glabrata Ann Howald 2003-4-23 2306 Colusa Inner North Coast Ranges, Bear Valley Road, c. 1.5 miles north of intersection with Bear Valley Grade/Old Wilbur Road 395 Comment
  CDA32830  Lasthenia glabrata P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 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
  POM914476  Lasthenia glabrata subsp. glabrata L. S. Rose 1936-4-27 36184 Colusa 15 miles NW of Rumsey. 305 Comment
  UC90075  Lasthenia gracilis K. C. Brandegee May 1883 Colusa Sulphur Creek Comment
  UCD64253  Lasthenia gracilis Craig D. Thomsen 2000-3-31 2054 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
  UC90010  Lasthenia platycarpha T. S. Brandegee 1889-4-12 Colusa Colusa Junction Comment
  JEPS95647  Lathyrus jepsonii var. californicus Vernon H. Oswald and L. Ahart 1999-6-22 9782 Colusa West of Stonyford and 0.7 mi south of Letts Lake Road on FS 17N02: T17N R8W Sect. 25, 4440 ft, mixed coniferous forest 1353 Comment
  CAS-BOT-BC323902  Layia chrysanthemoides Ethel Crum 1938-5-8 2038 Colusa Bear Valley, 4 miles S of Leesville. 426 Comment
  CHSC53936  Layia chrysanthemoides Vernon H. Oswald 1991-4-21 4521 Colusa Bear Valley Rd in Bear Valley, 1.0 mi south of Brim Rd (Bartlett Springs Rd), west of Williams. Roadside. 417 Comment
  CHSC62858  Layia chrysanthemoides Vernon H. Oswald 1994-4-11 6103 Colusa Sacramento National Wildlife Refuge. Refuge located ca. 7 mi S of Willows, on the E side of Pool 10 between levee road and Logan Creek. 21 Comment
  CHSC81247  Layia chrysanthemoides J. Trizzino 2001-3-31 14 Colusa Bear Valley Meadow along east side of Bear Valley Road. 396 Comment
  CHSC83299  Layia chrysanthemoides Jenny Marr; Heidi West, Joyce Lacey-Rickert, Caroline Warren 1998-5-8 Colusa Vicinity of Sites and Antelope Valley. 152 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
  UCD63010  Layia chrysanthemoides Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4663 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Near corral on west side of Bear Creek just south of Hwy 20. 319 Comment
  HSC62779  Layia chrysanthemoides Thomas Wood 1979-4-14 109 Colusa Bear Valley 396 Comment
  HSC95341  Layia chrysanthemoides A. Hove, A. Poteet, C. Sanville 1999-5-1 40 Colusa Bear Bear Valley Rd., 2 km S of Brim Rd. 415 Comment
  POM284945  Layia chrysanthemoides Lyman Benson 1935-3-27 6341 Colusa Williams; Mt. Range: Inner N Coast; Watershed: Sacramento River 61 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
  UCD135673  Layia chrysanthemoides Bruce G. Baldwin 1986-4-13 596 Colusa Bear Valley, immediately west of Bear Valley Road, 7.3 miles north of junction with California State Highway 20. Comment
  UCR37887  Layia chrysanthemoides subsp. chrysanthemoides C. G. Phillips, L. Cole, SA. Haultain, K. B. Barrows 1984-4-29 32 Colusa Bear Valley road Comment
  UCR7836  Layia fremontii Marilyn Malin 1968-3-30 243 Colusa Coast Range, north side of Hwy 16, between Hwy 16 and Cache Creek at jct of Hwy 16 and Hwy 20 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
  CDA11407  Layia platyglossa G. F. Hrusa, K. van Katwyk 1995-4-22 12128 Colusa Inner North Coast Ranges; Bear Valley, 15 m. N of Hwy. 20. Comment
  CHSC53937  Layia platyglossa Vernon H. Oswald 1991-4-21 4522 Colusa Bear Valley Rd in Bear Valley, 3.3 mi south of Brim Rd (Bartlett Springs Rd), west of Williams. Roadside. 417 Comment
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May 24 2013
  UCD163306  Layia platyglossa Craig D. Thomsen 1997-4-20 1909 Colusa Bear Valley. About 5 miles north of Hwy 20. Comment
  UCD163693  Layia platyglossa Craig Thomsen 1999-4-27 1995 Colusa Bear Valley. About 6 miles north of Hwy 20, west of Bear Valley Rd. Comment
  CAS-BOT-BC329324  Layia septentrionalis R. F. Hoover 1938-4-24 3213 Colusa Upper Sand Creek Comment
  CHSC91503  Layia septentrionalis D. Isle 1995-4-27 390 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. East Park Reservoir Spillway Rd., just SE of spillway and on both sides of road just before spillway summit. 365 Comment
  CHSC91515  Layia septentrionalis D. Isle 1995-4-30 391 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. Goat Mt. Rd. (Little Stony Rd.), 5.1 mi. out from jct. with Stonyford-Lodoga Rd. and just W of Sullivan Creek Bridge. 487 Comment
  UC75946  Layia septentrionalis Miss M. Alice King 1905-1-1 Colusa near College City Comment
  UCR261646  Layia septentrionalis Ann Howald 2003-4-23 2313 Colusa Inner North Coast Ranges, Indian Valley, East Park Reservoir, Catholic Point peninsula, east of Coppermine Road, c. 1.1 mi north of intersection with East Ruby King Road 403 Comment
  UCR261647  Layia septentrionalis Ann Howald 2003-4-23 2309 Colusa Inner North Coast Ranges, Indian Valley, East Park Reservoir, Catholic Point peninsula, west of Coppermine Road, c. 0.05 mi north of intersection with East Ruby King Road 428 Comment
  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-BC274325  Leersia oryzoides Herbert L. Mason 1945-9-19 12715 Colusa Below causway over Butte Sink spillway, east bank of Sacramento River, 1 mile above Colusa Comment
  CAS-BOT-BC534351  Lemna aequinoctialis Herbert L. Mason 1946-8-15 13009 Colusa Two miles west of Calousa on Wlliams highway by bridge Comment
  POM185961  Lemna gibba A. A. Heller, H. E. Brown 1902-5-19 5571 Colusa Near Colusa. Comment
  JEPS127105  Lemna minuta Lowell Ahart, John Dittes, Josephine Guardino 2016-2-14 20723 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
  CHSC116664  Lemna trisulca Lowell Ahart; John Dittes, Josephine Guardino 2016-2-14 20722 Colusa Small pond on the east side of the gravel 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
  UC1107309  Lemna trisulca J. M. Tucker and L. K. Mann and John Tothill 1959-5-30 3532 Colusa 1/4 mi nw of Lower Letts Valley (and 4 air mi n of Goat Mountain Lookout, in Mill Valley); Mill Valley Comment
  SEINET8201321 Image available Lemna trisulca J. M. Tucker, L. K. Mann, John Tothill 1959-1 3532 Colusa Mill Valley Comment
  UC1101262  Lemna trisulca C. Richie Bell 1951-6-13 1167 Colusa just below Letts Meadow (on road from Bear Creek to Foutes Spring) 914 Comment
  UC1101274  Lemna turionifera Herbert L. Mason, Verne Grant 1946-8-6 12966 Colusa 4 mi s of Colusa (w side of Sacramento River, on Colusa-Marysville Highway); Sacramento River Comment
  CHSC107952  Lepidium dictyotum var. acutidens B. Castro; T. Boullion 2011-4-20 1834 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 vernally moist flats, vernal pools and large bald patch of bare whitish soil. 49 Comment
  CHSC79481  Lepidium dictyotum var. acutidens L. P. Janeway; B. Castro 2000-3-23 6636 Colusa Vicinity of Funks Creek and Glenn-Colusa Canal. 47 Comment
  CHSC101071  Lepidium draba David W. Isle 2007-4-13 1633 Colusa East of Maxwell about 1 mile; south of Maxwell Rd. and east of Lyons Rd. in ditch between rice field east of Williams Dirk's shop. 30 Comment
  CHSC91136  Lepidium latifolium D. Isle 1997-7-31 333 Colusa Mendocino National Forest--North Coast Ranges. Bear Creek Watershed. 3 mi. S of jct. Bartlett Springs/Bear Valley Rd. 304 Comment
  SEINET1908437  Lepidium latifolium G. K. Helmkamp, E. A. Helmkamp 2008-1 14257 Colusa Sacramento Valley: along River Road (generally following the Sacramento River), 1.1 miles north of Colusa 18 Comment
  CAS-BOT-BC89762  Lepidium latipes M. K. Curran 1885-1-1 s.n. Colusa Williams. Comment
  POM143190  Lepidium latipes Roxana S. Ferris 1917-4-12 532 Colusa 4 miles east of Williams. Comment
  CAS-BOT-BC89887  Lepidium nitidum Roxana S. Ferris 1917-4-19 694 Colusa Sycamore Slough, roadside. Comment
  UCD57342  Lepidium nitidum Sergio Testa 2007-3-25 2 Colusa BLM Payne Ranch. Destinella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 560 Comment
  CHSC115390  Lepidium nitidum var. nitidum Lowell Ahart 2015-4-1 19990 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
  UC1100306  Leptochloa fascicularis Herbert L. Mason 1945-9-19 12720 A Colusa e bank of river 1 mi n Colusa (below causeway); Sacramento River Comment
  UCD82365  Leptosiphon androsaceus Robin McMaster 1973-4-15 335 Colusa 1/2 mi towards Bartlett Springs from Bear Valley Road. Comment
  UCD118630  Leptosiphon bicolor Clinton C. Shock 1980-5-3 57 B Colusa Bear Valley, about 12 miles north of State Highway 20. 384 Comment
  UCD57330  Leptosiphon bicolor Amy Whitcomb 2007-3-25 2 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
  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
  UCD163880  Leptosiphon ciliatus Craig D. Thomsen 2002-3-27 2575 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
  HSC47564  Leptosiphon ciliatus J. P. Smith, J. O. Sawyer 1978-4-29 9796 Colusa Bear Valley Rd., 5.9 mi. from its junction with Hwy. 20 366 Comment
  RSA589923  Leptosiphon ciliatus Michael A. Vincent, Robert M. Rhode 1996-3-30 7288 Colusa Along Bear Valley Rd. above Bear Creek, 0.6 mi. N jct. Wilbur Springs Rd. Comment
  HSC90410  Leptosiphon latisectus Joe Doyle, Gayle Honeycutt, Ethan Freid 1992-4-11 64 Colusa 6 mi. E of intersection between Walker Ridge Rd. and Bear Valley Rd. 293 Comment
  UCD163234  Leptosiphon parviflorus Craig D. Thomsen 2001-4-12 2440 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 1 mile west of Hwy 20/16 intersection. 345 Comment
  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
  UCD81858  Leptosiphon parviflorus Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5742 Colusa Walker Ridge. Along Walker Ridge Road. Lookout area with fence and view of Indian Valley Reservoir. North of turnoff to Indian Valley Reservoir and S of turnoff to picnic area. W side of road. 1061 Comment
  UCD82545  Leptosiphon parviflorus Ellen Dean; G. Harrington, C. Thomsen,R. Wilmarth,Chiao-Yi Cheng 2009-5-20 5700 Colusa Walker Ridge. Along Walker Ridge just S of turn-off to picnic area near Cold Spring. 1007 Comment
  CHSC32205  Lesquerella occidentalis subsp. occidentalis James Jokerst 1980-8-7 1067 Colusa North Coast Ranges. Near Snow Mountain (west). Comment
  UCD70252  Lessingia micradenia D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley. Destanella Flat-Walker Ridge. 450 Comment
  NY180585  Lessingia nemaclada M. K. Curran 1884-1 s.n. Colusa At Epperson's Comment
  UC1563853  Lessingia nemaclada Barbara Ertter with Elizabeth Neese, Laura Fujii, and Dawn Espindola 1989-10-21 8877 Colusa near end East Park Road from Stonyford (nw side of reservoir); East Park Reservoir 365 Comment
  UCD66535  Lessingia nemaclada Craig D. Thomsen 2001-5-24 2487 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
  JEPS24542  Lessingia nemaclada Peter H. Raven and R. Snow 1959-9-11 14425 Colusa about 2 mi se Happy 762 Comment
  CHSC112640  Lessingia ramulosa Lowell Ahart 2013-10-1 19068 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
  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
  UCD163655  Lessingia ramulosa Craig Thomsen 1998-6-10 1953 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCD58177  Lessingia ramulosa Gordon Harrington 2007-5-31 68 Colusa BLM Payne Ranch. Lands to the SW of the intersection of Hwy 16 and Hwy 20. Along Thompson Creek, approximately 3/4 mile downstream from Road Kill Cafe. 357 Comment
  HSC49866  Lewisia rediviva J. P. Smith, J. O. Sawyer 1978-4-29 9779 Colusa Lake/Colusa County Line; Walker Ridge Rd., 4.8 mi. N from the T-intersection to Indian Valley Reservoir Comment
  JEPS73452  Lewisia triphylla L. R. Heckard 1972-7-8 3052 Colusa n side of ridge running se of Snow Mt. West 2011 Comment
  UCD163658  Leymus triticoides Craig Thomsen 1998-6-10 1956 Colusa Bear Valley. About 7 miles north of Hwy 20. 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
  UCR118966  Limnanthes douglasii subsp. nivea Beecher Crampton 1975-4-21 9167 Colusa Inner North Coast Ranges, Mendocino National Forest, 1 mile west of Lodoga 396 Comment
  CHSC84972  Limosella acaulis Lowell Ahart 2003-10-23 10678 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
  UC963759  Linanthus bolanderi Herbert L. Mason 1941-4-5 12405 Colusa 3 mi s Stonyford Comment
  UC201776  Linanthus bolanderi Volney Rattan 1884-5-20 Colusa summit above Foute's Springs Comment
  CHSC112227  Linanthus ciliatus Lowell Ahart 2013-5-1 18668 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
  SEINET12318341  Linanthus ciliatus K. D. Whitney, Stern, K. R. 1978-1 21 Colusa 11 mi WSW of Williams, Salt Canyon, N side of Salt Creek, Hwy 20 143 Comment
  UC907804  Linanthus dichotomus Herbert L. Mason 1941-4-5 12407 Colusa 1 mi s Stonyford Comment
  HSC89699  Linanthus dichotomus Eric German, Klara Varga, Michele Cardinaux 1989-4-15 35 Colusa Goat Mtn. Rd. .2 mi. from Lodoga/Stonyford jct. 152 Comment
  UCD118534  Linanthus dichotomus Beecher Crampton 1958-4-21 9172 Colusa 4 miles NW of Lodoga (by road). Comment
  UCR198147  Linanthus jepsonii Ellen Dean, C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3681 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
  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
  JEPS15252  Lithophragma affine Rimo Bacigalupi with G. Ledyard Stebbins and Peter Kamb 1950-4-16 3111 Colusa 4 mi s Ladoga (and 6 mi nnw of Leesville, along Little Indian Creek); Indian Valley, Little Indian Creek 396 Comment
  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
  CHSC42597  Lomatium californicum Vernon Oswald 1986-6-4 2080 Colusa M10, 0.2 mi w of its jct. with M5. 609 Comment
  UC1409830  Lomatium ciliolatum var. ciliolatum James E. Eckenwalder and Dale E. Johnson 1974-6-2 358 Colusa below summit of East Peak Snow Mt. (on divide between East & West Peaks); , East Peak Comment
  CDA12080  Lomatium ciliolatum var. hooveri G. F. Hrusa 1989-4-8 5913 Colusa North Coast Biodiversity Arena; Bartlett Springs road immediately to W of Bear Valley, lower slopes of Walker Ridge. Comment
  UCD57548  Lomatium dasycarpum subsp. dasycarpum Cindy Yip; 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. Meadow on the west side of State Route 16, ca. 2 road miles south of intersection with State Route 20. 304 Comment
  UCD163350  Lomatium dissectum Craig D. Thomsen 2000-5-12 2332 Colusa Walker Ridge. Along road to Elgin Mine. Comment
  SD70547  Lomatium hooveri Linclon Constance 1965-4-13 3756 Colusa Between Clear Lake, Oaks and Williams, Highway 20, 2.7 miles west of Highway 16 550 Comment
  UC903739  Lomatium hooveri Milo S. Baker 1947-4-6 11646 Colusa near Hwy. 20 ca. 1 mi. e. Lake-Colusa Co. line Comment
  UCD148573  Lomatium hooveri G. Ledyard Stebbins 1985-5-19 C 529 Colusa Southeast of Goat Mountain peak. Pacific Point along Goat Rock Ridge, east of Goat Rock. (Exact location unknown; coordinates estimated by label maker. Note, Pacific Point at 3700 ft does not quite fall into Section 25.) 1127 Comment
  UCD163312  Lomatium hooveri Craig D. Thomsen 1997-4-18 1901 Colusa Bear Valley. About 6 miles north of Hwy 20. Vicinity of Trout Creek, north of Deadshot Canyon. Comment
  UCD56686  Lomatium hooveri Gordon Harrington 2007-3-25 5 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. 558 Comment
  UCSC010456  Lomatium hooveri Dylan M. Neubauer, Tim Forsell 2016-3-31 601 Colusa (NCoRI) Walker Ridge, Walker Ridge Road, 1.96 air-miles sse Cold Spring Mountain 820 Comment
  RSA0060080  Lomatium macrocarpum Richard R. Halse 2014-3-25 9033 Colusa Along the Leesville-Logoda Road ca. 5.6 miles south of Logoda; Indian Valley. 425 Comment
  SEINET11263259  Lomatium macrocarpum Richard R. Halse 2014-3-25 9033 Colusa Along the Leesville-Logoda Road ca. 5.6 miles S of Logoda. Indian Valley.; 0 425 Comment
  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
  UC1094589  Lomatium macrocarpum C. R. Bell 1953-3-22 1405 Colusa ca. 2 mi. from Indian Valley (on rd. to Bartlett Springs, e. slope of rirst ridge) Comment
  SEINET199389  Lomatium marginatum Rimo Bacigalupi, Arthur Holmgren 1950-4-26 3172 Colusa 'Grapevine Grade' to Lodoga 7.7 miles west of Sites Comment
  CHSC77910  Lomatium marginatum var. purpureum Beth Hendrickson; Heidi West 1999-3-23 Colusa Vicinity of Sites and Stone Corral Creek. 121 Comment
  JEPS17548  Lomatium utriculatum Alice King May, 1906 Colusa College City Comment
  JEPS17580  Lomatium utriculatum W. L. Jepson 1932-5-8 16281 Colusa w. Colusa Co., Stonyford Comment
  UC875215  Lomatium utriculatum Lewis S. Rose 1936-4-27 36180 Colusa 11 mi. n.w. Rumsey Comment
  UCD163680  Lomatium utriculatum Craig Thomsen 1999-4-15 1981 Colusa Bear Valley. About 5 miles north of Hwy 20, west of Bear Valley Rd. Comment
  UCR243135  Lomatium utriculatum A. Bebensee 1984-4-21 6 Colusa Inner North Coast Range, 9 miles north of Hwy 20 on Bear Valley Road 405 Comment
  HSC47643  Lomatium utriculatum J. P. Smith, J. O. Sawyer 1978-4-29 9795 Colusa Bear Valley Rd., 5.9 mi. from its junction with Hwy. 20 366 Comment
  UCD40910  Lomatium utriculatum Kathi A. Zurakowski 1984-5-21 s.n. Colusa Bear Valley. 3.2 miles north of turnoff to Wilbur Springs. In field, west of road. 381 Comment
  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
  SEINET11262797  Lomatium vaginatum Richard R. Halse 2014-3-25 9028 Colusa Along the Sites Logoda Road ca. 5.2 miles NW of Sites.; 0 175 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
  SEINET9672754  Lomatium vaginatum R. R. Halse 2014-3-25 9028 Colusa Along the Sites-Logoda Road, ca. 5.2 mi NW of Sites. 175 Comment
  UCD57666  Lonicera interrupta Erica A. Smith; with Plant Biology 102 2007-4-29 4 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central/Eastern part of ranch. Craig Canyon. Along unimproved road, 100 yards west of where road crosses Craig Creek. 313 Comment
  CAS-BOT-BC198625  Lotus Roxana S. Ferris 1917-4-14 577 Colusa Foothills 7 miles west of Arbuckle, Arbuckle-Rumsey Road. 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
  CHSC94444  Lotus corniculatus Lowell Ahart 2006-8-9 13129 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS60203  Lotus crassifolius var. crassifolius L. R. Heckard 1969-5-29 2239 Colusa about 6.5 mi se Stonyford (along Trough Spring Ridge road, 0.2 mi n of its junction with Crackerbox Ridge road) 1127 Comment
  UC1299188  Lotus crassifolius var. crassifolius Freed W. Hoffman 1948-6-27 2515 Colusa 8.6 mi s Fouts Springs (w Colusa Co.); Upper Letts Valley Comment
  JEPS80208  Lotus denticulatus L. R. Heckard and J. Hickman 1980-7-3 5362 Colusa n of (across road) Summit Springs (sw slope of Snow Mt., Lake-Colusa County boundary); Snow Mt. 1548 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
  HSC48166  Lotus humistratus Thomas W. Nelson, Jane P. Nelson 1978-4-29 3930 Colusa Along Bear Valley Rd., 2 mi. from the junction with State Route 20. 366 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
  UC725836  Lotus purshianus var. purshianus A. A. Heller 1919-6-8 13243 Colusa Ladoga Comment
  UCR225395  Lotus scoparius Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5113 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20. Southwestern edge of ranch above Cache Creek Canyon along ridge trail 551 Comment
  RSA725014  Lotus unifoliolatus L. Ahart 2006-8-9 13150 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
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Aug 9 2017
  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
  HSC66007  Lupinus albifrons Teri Bartowski, Shane Feusier, Ruth Takaki, Carol Zimmerer 1980-4-19 42 Colusa 5.4 miles from Lodoga, along Little Stony Creek at Digger Pine Campground Comment
  HSC89790  Lupinus albifrons L. Blackford, S. Branch, D. Malm 1988-4-16 71 Colusa 15.3 mi. off Hwy. 20 on Walker Ridge Rd. 915 Comment
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Aug 20 2014
  UCD56933  Lupinus albifrons Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3535 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Thompson Canyon. 344 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
  POM163513  Lupinus albifrons var. albifrons Roxana S. Ferris 1926-4-23 6422 Colusa Near summit on grade. Williams- Stonyford Road. 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
  RSA799177  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, 0.4 mi southeast of Sites. 77 Comment
  UCD66966  Lupinus albifrons var. collinus Ellen Dean; Davis Botanical Society 2008-5-31 5010 Colusa west of I-5 at Maxwell, east slope of Goat Mountian, along Goat Mountain Road, between Cedar grove campground and the summit, near crossing of tributary of Little Stoney Creek. 1309 Comment
  UCD83748  Lupinus albifrons var. collinus Ellen Dean; G. Harrington, K. Mawdsley, J. Shepard 2010-5-1 5945 b Colusa Walker Ridge. Along Walker Ridge Road at intersection with road to Eaton Springs. Roadside, on E side of road. 927 Comment
  UCR212293  Lupinus albifrons var. collinus Ellen Dean, Davis Botanical Society 2008-5-31 5010 Colusa West of I-5 at Maxwell, east slope of Goat Mountain, along Goat Mountain Road, between Cedar Grove Campground and the summit, near crossing of tributary of Little Stoney Creek 1309 Comment
  UCR224884  Lupinus albifrons var. collinus Ellen Dean, Gordon Harrington, Kate F. Mawdsley, Jean V. Shepard 2010-5-1 5945 A Colusa Walker Ridge, along Walker Ridge Road at intersection with road to Eaton Springs, east side of road 927 Comment
  HSC85823  Lupinus albifrons var. collinus David Munger, Tallchief Comet, Jeff Dunk 1987-4-12 77 Colusa 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
  SEINET5320895  Lupinus bicolor Unknown 2002-3-21 6131 Colusa Williams; By junction of 5th Street and B Street 20 Comment
  UCD163686  Lupinus bicolor Craig Thomsen 1999-4-15 1988 Colusa Bear Valley. About 5 miles north of Hwy 20, west of Bear Valley Rd. Comment
  UCD58101  Lupinus bicolor Ellen Dean; C. Thomsen, S. Bledsoe, G. Harrington, D. Hickson 2007-3-25 3478 Colusa BLM Payne Ranch. Lands to the southwest of the intersection of Hwy. 16 and Hwy. 20. Destanella Flat, just E of the Lake County Border. Ca. 3.4 miles along Hwy. 20 from junction of Hwy. 20 and Hwy. 16. 560 Comment
  UCD83718  Lupinus bicolor Joseph Schlottman; with PLB 102 class 2010-5-2 4 Colusa East slope of Walker Ridge. Eaton Springs. Adjacent to main creek. 710 Comment
  UCR233443  Lupinus bicolor George K. Helmkamp, E. A. Helmkamp 2011-4-1 17131 Colusa Eastern Foothills North Coast Ranges, Antelope Valley, along Maxwell-Sites Road, 0.4 miles southeast of Sites 93 Comment
  HSC89739  Lupinus bicolor A. Eller, A. Smith, B. Hoffman 1989-4-15 20 Colusa Brim Rd., 3 mi. W of Bear Valley Rd. 457 Comment
  POM278280  Lupinus bicolor subsp. tridentatus Lyman D. Benson 1935-3-27 6329 Colusa 8 miles E of Lake County line, inner N coast mt. range, Sacramento River watershed 305 Comment
  HSC45663  Lupinus densiflorus var. aureus Howee Barban 1978-4-22 16 Colusa Bear Valley Rd., 1.5 mi. from its junction with State Route 20 412 Comment
  POM163463  Lupinus densiflorus var. aureus Roxana S. Ferris 1926-4-23 6415 Colusa At Mountain House on the Williams-Stonyford Road. Comment
  RSA10439  Lupinus densiflorus var. aureus Carl B. Wolf 1928-5-8 2129 Colusa Sacramento Valley. 2 miles north of Dunnigans. Comment
  RSA424727  Lupinus densiflorus var. aureus Aaron Liston, M. Blumler 1987-4-26 617 -1 Colusa 15.7 miles south of Stonyford. Lessville - Lodoga Road. Comment
  SEINET10838182  Lupinus densiflorus var. aureus J. P. Kroessig 1977-4-16 Kroessig 9 Colusa Corolla yellow-white, pleasantly scented. Large population ca. 0.3 Mi. Sw of Jct of hwys 20 and 16, s side of bear creek, ca 18 mi. Sw of williams. Wilbur Springs quad, 15'. S central border of sec 36, t14n, r5w. Open foothill Woodlands. 322 Comment
  RSA424726  Lupinus densiflorus var. palustris Aaron Liston, M. Blumler 1987-4-26 668 -1 Colusa East Park Reservoir, 3.2 miles E of Stonyford Comment
  CAS-BOT-BC8485  Lupinus formosus var. robustus Amos Arthur Heller; H. E. Brown 1902-5-20 5573 Colusa Near College City Comment
  JEPS86629  Lupinus latifolius var. latifolius L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-19 6696 Colusa 0.5 km w Summit Springs (sw flank of Snow Mountain, Colusa lake Co.-Line); sw flank Snow Mountain 1500 Comment
  JEPS98385  Lupinus luteolus Vernon H. Oswald 2000-8-21 9950 Colusa Bear Valley near the junction of Bear Valley and Brim roads 411 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
  CDA27487  Lupinus microcarpus var. densiflorus L. Ahart 2003-7-14 10390 Colusa On the east and west sides of Bear Valley Road, about 1/4 mile north of the intersection of Bear Valley Road and Wilber Springs Road and bridge. Comment
  CHSC90508  Lupinus microcarpus var. densiflorus Martin Polsan 1988-4-9 14 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. 143 Comment
  CHSC91566  Lupinus microcarpus var. densiflorus D. Isle 1995-4-28 402 Colusa Mendocino National Forest--North Coast Ranges. Bear Creek Watershed. Lodoga Rd. just N of Leesville Rd. jct., 1/8 mi., at road edge. 304 Comment
  UC1053479  Lupinus microcarpus var. densiflorus Rimo Bacigalupi, Arthur Holmgren 1950-4-26 3176 Colusa 10 mi nw Sites (Grapevine Grade to Lodoga); Grapevine Grade to Lodoga Comment
  UC726766  Lupinus microcarpus var. densiflorus A. A. Heller 1940-5-6 15576 Colusa on steep clay banks along State Hwy #20 about 3 mi e junction with Highway #16 Comment
  UCD163886  Lupinus microcarpus var. densiflorus Craig D. Thomsen 2002-4-26 2600 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 0.75 mile west of Hwy 20/16 instersection. Comment
  JEPS108050  Lupinus microcarpus var. densiflorus Rhonda Riggins 1982-5-30 1448 Colusa Roadside Ladoga-Leesville Road, 4.4 mi N Leesville. 457 Comment
  OBI56806  Lupinus microcarpus var. densiflorus Rhonda Riggins 1982-5-30 1448 Colusa Roadside Ladoga-Leesville Rd, 4.4 mi N Leesville 457 Comment
  SD52958  Lupinus microcarpus var. densiflorus Peter H. Raven 1962-5-31 17910 Colusa Stae Hwy 20, 2.5 miles east of Lake County line Comment
  CHSC107948  Lupinus microcarpus var. microcarpus B. Castro; Robin Carter, Jessica Boyt 2011-4-25 1849 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 5 air mi NW of Maxwell, 1 mi southeast of Funks Reservoir and 170 ft northeast of Tehama-Colusa Canal. Ca 0.15 mi S of large +- saline/alkaline wetland/ marsh, on dry grassy hillside just downslope from canal. 59 Comment
  UCD166301  Lupinus microcarpus var. microcarpus Jack Major 1962-4-28 804 Colusa At entrance to Bear Valley. (Exact location unknown. Coordinates estimated by label maker.) 381 Comment
  UCR212341  Lupinus microcarpus var. microcarpus Craig D. Thomsen 2000-4-28 2199 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mi west of Hwy 20/16 intersection, milepost 2.80-3.00 310 Comment
  HSC91380  Lupinus nanus Robin Bencie, James Jones, Rich Dwerlkotte 1989-4-15 19 Colusa 3 times SW of Digger Pine Campground on Goat Rd. 152 Comment
  HSC86906  Lupinus subvexus var. subvexus Terry Hines, Ellen Purcell, N. Williams 1988-4-17 58 Colusa 1.3 mi. S on Bear Valley Rd. from corner of Brim Rd. 396 Comment
  CHSC114063  Lupinus succulentus Richard R. Halse 2013-3-26 8736 Colusa Along the Leesville Road ca 1.8 miles northwest of its junction with State Hwy 20, west of Williams. 85 Comment
  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
  SEINET5586445  Lupinus succulentus Richard R. Halse 2013-1 8736 Colusa Along the Leesville Road ca. 1. 8 miles northwest of its junction with State Hwy. 20, west of Williams. 85 Comment
  UCR206293  Lupinus succulentus George K. Helmkamp, E. A. Helmkamp 2009-5-20 14735 Colusa Central Inner Coast Ranges, along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 320 Comment
  UCR233449  Lupinus succulentus George K. Helmkamp, E. A. Helmkamp 2011-4-1 17123 Colusa Eastern Foothills North Coast Ranges, Antelope Valley, along Maxwell-Sites Road, 0.4 miles southeast of Sites 93 Comment
  CHSC115620  Lupinus succulentus David Isle; Jeff Lynch, Terril Wolt 2015-4-18 2152 Colusa Sacramento Valley Foothills: North side of Canyon Creek, just west of road crossing in Cortina Rancheria. 17 miles SE of Williams and 15 miles W of Arbuckle. 10S -056228E, 431874N. GPS taken at lunch spot ~100 years below (E of) road crossing of Canyon Creek. Collection taken ~50 yards above (W of) road crossing. Comment
  SEINET12161340  Lupinus succulentus D. M. Burk 1978-1 87 Colusa 5.1miW of Walker Ridge Rd, Hwy 20. Wilbur Springs Quad 15'. S35 T14N R6W 457 Comment
  UCD163325  Lycium barbarum Craig D. Thomsen 1997-4-19 1908 Colusa Wilbur Springs. About 4 miles north of Hwy 20. Vicinity of Blank Spring, about 0.75 miles west of Wilbur Hot Springs hotel, adjacent to Sulphur Creek. Comment
  CHSC61752  Lythrum californicum Vernon H. Oswald 1993-9-1 5890 Colusa Sacramento Wildlife Refuge. Refuge located ca. 7 mi S of Willows, N side of Hunters Creek in Tract 44, near the S boundary of the refuge. Growing along tules in a ditch along the levee road bordering the N side of Tract 44, S of Cell 1, Pool 12. 22 Comment
  JEPS98324  Lythrum californicum Vernon H. Oswald 2000-9-29 9973 Colusa Colusa National Wildlife Refuge, between the hiking trail and Powell Slough 13 Comment
  UC1191570  Lythrum californicum Herbert L. Mason, Verne Grant 1946-8-7 12977 Colusa 8 mi n of Colusa (Butte Sink); Butte Sink Comment
  UCD102989  Lythrum californicum Dick Johnson 1977-6-15 s.n. Colusa West of Williams rangeland. 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
  CHSC94480  Lythrum tribracteatum Lowell Ahart 2006-8-9 13162 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS104406  Lythrum tribracteatum Lowell Ahart 2003-10-23 10667 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
  UC1609445  Lythrum tribracteatum Vernon H. Oswald and Lowell Ahart 1993-5-27 5429 Colusa 0.5 mi nw of Sites (bordering the w side of Sacramento Valley, Sites-Lodoga Road); Sacramento Valley, Sites-Lodoga Road 121 Comment
  UCD67069  Lythrum tribracteatum Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5097 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western part of ranch along ridge trail at Cache Creek Canyon. Just south of junction with trail that leads east to Brophy Canyon and Thompson Creek. 494 Comment
  JEPS117019  Lythrum tribracteatum David Gowen 2008-5-24 925 Colusa West of Sites on north side of road. Comment
  JEPS4791  Madia elegans Rimo Bacigalupi with L. R. Heckard 1951-8-6 3472 Colusa 1 mi se Sites (in canyon near stone quarry) Comment
  CAS-BOT-BC342679  Madia elegans Walter Knight; Irja Knight 1963-9-23 103 Colusa Near Stony Ford 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
  CHSC79466  Madia exigua B. Castro; L. P. Janeway 2000-5-2 1106 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 216 Comment
  RSA755624  Madia exigua George K. Helmkamp, E. A. Helmkamp 2009-5-20 14741 Colusa Along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 320 Comment
  UCD66678  Madia exigua Craig D. Thomsen 2000-5-11 2302 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
  CHSC86127  Madia gracilis Jenny Marr; Julie Cunningham, Heidi West, Caroline Warren 1998-5-27 Colusa Vicinity of Antelope Valley, Antelope Creek, and Huffmaster Road. 121 Comment
  JEPS80755  Madia gracilis L. R. Heckard and J. C. Hickman 1981-7-29 5722 Colusa spur about 1 km se Summit Springs (s side of mountain); Snow Mt. 1554 Comment
  UCD57858  Madia gracilis Gordon Harrington; Diana Hickson, Jack Alderson 2007-4-29 45 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. 412 Comment
  UCR206383  Madia gracilis George K. Helmkamp, E. A. Helmkamp 2009-5-20 14753 Colusa Inner North Coast Ranges, along CA-16, 1.8 miles north of the Yolo County line 271 Comment
  JEPS121749  Malacothamnus fremontii David Isle, Ronda Isle 2013-6-23 2044 Colusa COLUSA County, CA. Just E of Maxwell Grade Summit and pass; hot burned S aspect slope N of Sites Lodoga Road. (At Grapevine Pass). Comment
  RSA0118715  Malacothamnus fremontii David Isle, Rhonda Isle 2013-6-23 2044 Colusa Just E of Maxwell Grade Summit and pass; N of sites Lodoga Road. In July 2012 Sites Fire Area. 562 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
  CDA11410  Malacothrix floccifera G. F. Hrusa, K. van Katwyk 1995-4-22 12131 Colusa Inner North Coast Ranges; Leesville Rd. at summit of ridge immed. E of N end of Bear Valley. Comment
  CHSC27868  Malacothrix floccifera Robin Ondricek 1978-4-8 5 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. 143 Comment
  JEPS16207  Malacothrix floccifera Rimo Bacigalupi and Arthur Holmgren 1950-4-26 3185 Colusa just w Bear Valley (just w of base of the grade to Indian Valley (Bartlett Mt. Grade)); Inner North Coast Ranges Comment
  UCD63101  Malacothrix floccifera Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4932 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
  CAS-BOT-BC347386  Malacothrix floccifera Volney Rattan 1884-1-1 s.n. Colusa Unspecified Comment
  RSA135416  Malacothrix floccifera Volney Rattan 1884-1 s.n. Colusa [no location specified] Comment
  UC1174491  Malacothrix floccifera Volney Rattan 1884-1 Colusa Comment
  RSA669479  Malva parviflora R. R. Halse 2001-3-22 5945 Colusa Williams; along a vacant lot by 455-4th Street. 18 Comment
  UCD63127  Malvella leprosa Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4957 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Destinella Flat on the south side of Hwy 20, just east of the Lake County line, ca 3.4 rd miles west of junction with Hwy 16. 551 Comment
  UCR205148  Malvella leprosa George K. Helmkamp, E. A. Helmkamp 2008-10-14 14254 Colusa Sacramento Valley, along CA-20, 0.2 mile east of the Sutter County line 9 Comment
  SBBG121613  Malvella leprosa L. Ahart 2007-7-7 14261 Colusa N side of the Gridley Colusa Hwy ca. 1.25 mi E of River Rd, ca. 17 mi W of Gridley 20 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
  SEINET4208912  Marah watsonii Richard R. Halse 2013-3-26 8744 Colusa Along the Leesville-Logoda, or 3.2 miles north of the junction of Leesville and Bear Valley Roads; Indian Valley.; 0 426 Comment
  RSA63685  Marah watsonii Milo S. Baker 1947-4-6 11644 Colusa 1 mile E of Lake - Colusa boundary along hwy 20, Serpentine area. Comment
  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
  UCD67083  Marsilea vestita subsp. vestita Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5105 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
  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
  CHSC112216  Medicago polymorpha Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18651 Colusa Inner North Coast Range. On the north side of State Highway 20, just east of Lake County Line, 12.2 mile (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  HSC45689  Medicago polymorpha Patricia Shesgreen 1978-4-22 30 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  UCD163222  Medicago polymorpha Craig D. Thomsen 2000-3-31 2081 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
  UCD107923  Medicago sativa Beecher Crampton 1963-8-5 6872 Colusa 3.5 miles south of Grimes. Comment
  CHSC79529  Melia azedarach B. Castro; L. P. Janeway 2000-5-1 1101 Colusa Vicinity of Sites, hills S of the Sites-Lodoga Rd, and Grapevine Creek. 205 Comment
  HSC45732  Melica californica M. Alcasas 1978-4-22 34 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  UCD86457  Melica californica Beecher Crampton 1958-4-21 4730 Colusa 7.8 miles NW of Rumsey, along Hwy 16, just above junction of Bear Creek with Cache Creek. Comment
  UCD87699  Melica californica Beecher Crampton 1958-5-19 4817 Colusa West of Lodoga. Comment
  UCR206351  Melica californica George K. Helmkamp, E. A. Helmkamp 2009-5-20 14742 Colusa Central Inner Coast Ranges, along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 320 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
  CHSC112269  Melica torreyana Lowell Ahart 2013-5-1 18692 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
  UCD56672  Melica torreyana Jack Alderson 2007-3-25 8 Colusa BLM Payne Ranch. Destinella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 555 Comment
  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
  UCD82587  Melica torreyana Craig D. Thomsen; J. Wiegand, S. Harrison, G. Harrington, A. Fulks 2008-4-22 2732 Colusa Walker Ridge. Eaton Springs, 4 mi N of Hwy 20, ca. 1.5 mi E of Walker Ridge Rd. 609 Comment
  JEPS108722  Melilotus albus Lowell Ahart 2006-9-26 13349 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
  RSA724820  Melilotus albus L. Ahart 2006-9-26 13349 Colusa South side of the Delevan National Wildlife Refuge, north side of Maxwell Road about 3 miles west of Colusa Princeton Road, about 5 1/2 mils east of Maxwell. 24 Comment
  UCD72468  Melilotus albus Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3802 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. Bank of Bear Creek near north end of bridge, west side of creek. 260 Comment
  UCD72476  Melilotus albus Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3810 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. West side of Bear Creek, across from BLM parking lot that is located at south end of bridge. 249 Comment
  UCD64430  Melilotus indicus Craig D. Thomsen 2000-4-28 2211 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
  UC1051549  Mentzelia laevicaulis var. laevicaulis Helen K. Sharsmith 1953-6-21 4306 Colusa ca 1 mi within boundary of Mendocino National Forest (Slopes of Little Stoney Creek); Inner North Coast Ranges 670 Comment
  UCD82738  Mentzelia micrantha Craig Thomsen; G. Harrington 2009-5-14 2919 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. 822 Comment
  CHSC79254  Micropus californicus var. californicus B. Castro; L. P. Janeway 2000-4-10 1065 Colusa Vicinity of Sites in rolling hills near Sulphur Gap, among un-named tributaries to Lurline Creek. 106 Comment
  HSC40247  Micropus californicus var. californicus J. P. Smith, Thomas W. Nelson 1976-4-14 8584 Colusa Mendocino National Forest, confluence of Stony Creek and N Fork of Stony Creek. 427 Comment
  HSC47740  Micropus californicus var. californicus Thomas W. Nelson, Jane P. Nelson 1978-4-29 3946 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  JEPS40618  Micropus californicus var. californicus W. L. Jepson 1932-5-8 16279 Colusa Lodoga Comment
  UC1049551  Micropus californicus var. californicus Rimo Bacigalupi 1950-4-16 3104 Colusa vicinity Colusa-Glenn County line (ridge above Red Bridge Camp and the confluence of the North amd Middle Forks of Stony Creek); Inner North Coast Ranges, Mendocino National Forest 579 Comment
  UC71655  Micropus californicus var. californicus Miss Alice King 1905-4-7 Colusa College City Comment
  JEPS86623  Microseris L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-19 6703 Colusa sw flank of mountain 0.5 km w Summit Springs (Colusa-Lake County line); Snow Mountain 1500 Comment
  CHSC112209  Microseris douglasii subsp. douglasii 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
  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
  UCD66860  Microseris douglasii subsp. douglasii Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5063 Colusa BLM Payne Ranch. Lands to the southwest of the intersection of Hwy 16 and Hwy 20. Northwest corner of ranch. Along ridge trail on the border of Lake and Colusa counties, upslope of stock pond. 615 Comment
  CHSC81250  Microseris sylvatica L. P. Janeway; B. Castro 2001-4-26 7028 Colusa Vicinity of Grapevine Creek, Sites-Lodoga Road, and Eggman Canyon. 286 Comment
  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
  CHSC86524  Microsteris gracilis B. Castro; Beth Hendrickson 2003-3-19 1391 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 198 Comment
  RSA46870  Mimulus aurantiacus var. aurantiacus Doris K. Kildale 1927-04 3244 Colusa [Unspecified] Comment
  UCD163654  Mimulus cardinalis Craig Thomsen 1998-6-10 1952 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  CDA41441  Mimulus douglasii S. E. Schoenig 1998-4-24 98 -8 Colusa Adjacent to clearing east of Brim Road, 1.5 miles west of Bear Valley Road. Comment
  JEPS110093  Mimulus floribundus Lowell Ahart 2006-8-9 13151 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  JEPS80762  Mimulus floribundus L. R. Heckard and J. C. Hickman 1981-7-30 5729 Colusa crossing Trout Creek (se side of mt.); Snow Mt. 1828 Comment
  UCD82504  Mimulus guttatus Craig Thomsen; G. Harrington 2009-5-12 2864 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  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
  JEPS14629  Mimulus layneae Helen K. Sharsmith 1953-6-20 4290 Colusa 5 mi beyond Trough Springs (on road to Goat Mountain); Inner North Coast Ranges, Mendocino National Forest 1280 Comment
  UC1212581  Mimulus layneae Francia Chisaki, Helen K. Sharsmith 1959-5-27 1338 Colusa about 1/4 mi e Cooks Spring; Inner North Coast Ranges, Cooks Creek Comment
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Nov 19 2007
  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
  JEPS3633  Mimulus microphyllus H. L. Mason 1953-5-5 14518 Colusa 1/4 mi above confluence of Little Stony Creek and Trout Creek; Little Stony Creek drainage 670 Comment
  JEPS86637  Mimulus microphyllus L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-18 6685 Colusa along trail from Frog Pond to East Peak (sw flank of mtn.); Snow Mtn. 1900 Comment
  JEPS74812  Mimulus nudatus L. R. Heckard, T. I. Chuang, and R. Bacigalupi 1975-5-7 4020 Colusa just sw of site Old Kowalski ranch (below upper dam road, sw of Leesville); Upper Indian Valley 396 Comment
  UCD66858  Mimulus nudatus Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5061 Colusa BLM Payne Ranch. Lands to the southwest of the intersection of Hwy 16 and Hwy 20. Destinella Flat. Serpentine meadow on the east side of main drainage. 554 Comment
  JEPS108933  Mimulus pilosus Lowell Ahart 2006-8-9 13113 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  JEPS2941  Mimulus rattanii Volney Rattan Colusa trail above Fout's Spr. (n of San Francisco Bay); Coast Mts.; trail above Fout's Spring (?), Colusa Co. Comment
  NY90769  Mimulus rattanii V. Rattan 06 1882 s.n. Colusa Above Font's Spr. Coast Mts. North of San Francisco Bay. Comment
  JEPS10517  Mimulus tricolor Ruth Johnson 1915-4-6 Colusa College City Comment
  CAS-BOT-BC388583  Minuartia douglasii Annetta Carter 1938-5-7 1377 Colusa Comanche Hills, 4 miles north of Rumsey, Inner North Coast Range 259 Comment
  UC1613426  Minuartia douglasii Charles M. Belshaw 1937-4-25 2876 Colusa vicinity of Cook's Spring (Devil's Ridge); Inner N. Coast Range, Devil's Ridge Comment
  UCD57104  Minuartia douglasii Gordon Harrington; Diana Hickson 2007-4-7 0025 Colusa BLM Payne Ranch, SW of intersection of Hwy 16 and Hwy 20, ca .5 mi. W of Roadkill Cafe, N. of Thompson Creek. 439 Comment
  UCD82137  Minuartia douglasii Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5670 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
  UCD82385  Minuartia douglasii Craig Thomsen; G. Harrington 2009-5-12 2827 Colusa Colusa County. Walker Ridge. South of spur road en route to Eaton Springs, about 1/2 mile east of Walker Ridge Rd. About 100 yds south of road (ravine with spring below). 822 Comment
  UCD82364  Minuartia douglasii Robin McMaster 1973-4-15 334 Colusa middle of Bear Valley. Comment
  JEPS81413  Minuartia nuttallii subsp. gregaria L. R. Heckard and J. C. Hickman 1982-7-9 6021 Colusa just e Lookout (Colusa-Lake Co. boundary); Goat Mt. 1859 Comment
  CHSC64094  Monardella glauca David Isle 1992-8-3 Colusa Snow Mountain. Comment
  JEPS73483  Monardella odoratissima subsp. glauca L. R. Heckard 1972-7-9 3094 Colusa On southeast slope East Peak; Snow Mt. 2072 Comment
  JEPS81404  Monardella odoratissima subsp. glauca L. R. Heckard and J. C. Hickman 1982-7-9 6017 Colusa near junction Horse Glade (along road to Lookout, Colusa-Lake County boundary); Goat Mt. 1737 Comment
  UCD70238  Monardella sheltonii D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley, Bear Valley Road. Bear Valley Creek. 350 Comment
  SEINET9336472  Monardella villosa Mark Elvin, Isle, David; Brunell, Mark 2006-8-3 4991 Colusa Southern Northern Inner Coast Ranges 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
  CHSC94886  Monardella villosa subsp. villosa Lowell Ahart 2006-6-11 12672 Colusa On the east side of an off road trail (Trail 30), about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford. 613 Comment
  UC883639  Monardella villosa subsp. villosa A. A. Heller 1916-6-6 12355 Colusa Coast Range on the grade about 3 miles west of Leesville Comment
  UCD81712  Monardella villosa subsp. villosa Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5718 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
  CDA20256  Monardella villosa subsp. villosa G. D. Barbe, Nola Parmer 1982-6-4 3637 Colusa North Coast Ranges; Goat Mountain Rd, w of Lodoga-Stonyford Rd, Mendocino National Forest. 0 Comment
  CAS-BOT-BC349577  Monolopia major Ethel Crum 1938-5-8 2035 Colusa Bear Valley, four miles south of Leesville 426 Comment
  CHSC78236  Monolopia major Vernon H. Oswald 2000-4-20 9915 Colusa Bear Valley Road. 2.5 mi south of Rim Rd. (to Bartlett Springs). 402 Comment
  JEPS34944  Monolopia major R. F. Hoover 1938-4-24 3223 Colusa Venado Comment
  JEPS35229  Monolopia major W. L. Jepson 1932-5-7 16254 Colusa valley above Venado 274 Comment
  UC1484326  Monolopia major G. Hannan 1977-4-22 204 Colusa 12.4 mi n CA Hwy 20 (between Clearlake Oaks and Williams, 1.6 mi s of Brim Rd.) 411 Comment
  JEPS80371  Montia fontana L. R. Heckard and J. Hickman 1981-6-22 5605 Colusa s side of east ridge of East Peak, Snow Mountain East Peak; Snow Mountain, East Peak 1950 Comment
  UC719170  Muilla maritima F. G. Meyer 1938-4-5 1346 Colusa in meadow about 20 mi n Williams Comment
  CAS-BOT-BC83282  Myosurus minimus James Jokerst 1986-5-6 2299 Colusa Near Lurline Creek. 41 Comment
  POM312444  Myosurus minimus var. filiformis H. L. Mason 1953-4-5 1459 Colusa 3 miles east of Maxwell Comment
  UC1101351  Myosurus sessilis Herbert L. Mason 1953-4-5 14508 Colusa 3 mi e of Maxwell Comment
  POM312445  Myosurus sessilis H. L. Mason 1953-4-5 14508 Colusa 3 miles east of Maxwell Comment
  CHSC85969  Nassella cernua Jenny Marr; Julie Cunningham, Heidi West, Caroline Warren 1998-5-27 Colusa Vicinity of Antelope Valley, Antelope Creek, and Huffmaster Road. 137 Comment
  POM174566  Nassella cernua Roxana S. Ferris 1926-4-23 6424 Colusa Summit of grade of Williams-Strongford Road Comment
  UC1146671  Nassella cernua Freed W. Hoffman 1944-7-13 1957 Colusa between Indian Valley and Bear Valley; North Coast Ranges Comment
  CHSC85970  Nassella pulchra Jenny Marr; Caroline Warren 1998-5-4 Colusa Vicinity of Sites, Stone Corral Creek, and Antelope Valley. 106 Comment
  UCSB6643  Navarretia G. Keator 1958-6-17 S.N. Colusa JUST W OF BARTLETT SPRINGS Comment
  JEPS117022  Navarretia heterandra David Gowen 2008-5-24 920 Colusa West side of Bear Valley Road, about 6.7 miles north of Hwy 20. Comment
  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
  UCR197901  Navarretia jepsonii Calvin McMillan, Beecher Crampton (494F) 1949-9-25 s.n. Colusa 18 miles east of Bartlett Springs Comment
  UCR261670  Navarretia jepsonii Ann Howald 2003-5-29 2346 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
  CHSC107942  Navarretia leucocephala subsp. leucocephala B. Castro; L. Janeway 2011-4-27 1866 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 5 air mi NW of Maxwell, 0.8 mi southeast of Funks Reservoir and 0.3 mi northeast of Tehama-Colusa Canal. At SW end of vernally moist swale which extends northeast of large +- saline/alkaline wetland/ marsh, in drying vernal pool bottom. 48 Comment
  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
  UCD66933  Navarretia nigelliformis Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5082 Colusa BLM Payne Ranch. Lands to the SW of jct of Hwys 16 and 20. Northwestern part of ranch, along trail that follows the border of Lake and Colusa Counties. South of junction with trail that heads down to the headwaters of Thompson Creek. 428 Comment
  UCD57871  Navarretia nigelliformis subsp. nigelliformis Gordon Harrington; Diana Hickson, Jack Alderson 2007-4-29 51 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
  CAS-BOT-BC233594  Navarretia pubescens J. Clausen 1935-5-20 1014 Colusa 18 miles W of Williams on Bartlett Springs Road Comment
  CHSC1298  Navarretia pubescens V. Holt 1935-5-12 Colusa Stonyford. 365 Comment
  JEPS70419  Navarretia pubescens W. L. Jepson 1932-5-7 16256 Colusa 1 mi above Venado Comment
  SJSU6292  Navarretia pubescens E. O. Hass 1956-5-12 Colusa 10 mi SW of Arbuckle Comment
  UCD82118  Navarretia pubescens Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5646 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 839 Comment
  POM64859  Navarretia viscidula Roxana Stinchfield 1916-6-18 301 Colusa Timber near College City Comment
  JEPS22942  Nemacladus capillaris Volney Rattan 1884-1 Colusa above Stony Creek Comment
  JEPS80198  Nemacladus capillaris L. R. Heckard and J. C. Hickman 1980-7-3 5352 Colusa just w Summit Springs (ca 10 mi w of Stonyford, Colusa-Lake county boundary); Snow Mt. 1548 Comment
  UC1585893  Nemacladus capillaris Barbara Ertter 1989-7-1 8599 Colusa ca 12 air mi wsw Stonyford (road to Goat Mt. Lookout, 2.2 mi s of Rt M-10 (Bear Creek-Fouts Spring Rd) at head of South Fork Stony Creek); Stony Creek 1500 Comment
  UCD81730  Nemacladus capillaris Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5732 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
  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
  CHSC62937  Nemophila heterophylla Vernon H. Oswald; Lowell Ahart 1994-4-6 6058 Colusa Goat Mtn. Rd. 0.1 mi NE of Digger Pine Flat, S of Stonyford. Growing in gravelly soil of a roadside bank. 463 Comment
  CHSC77936  Nemophila heterophylla Beth Hendrickson; Jean Witzman 1999-4-21 Colusa Vicinity of Antelope Valley and Sites. 137 Comment
  RSA758531  Nemophila heterophylla George K. Helmkamp, E. A. Helmkamp 2009-3-11 14372 Colusa along CA-20, 14.3 miles southwest of Williams 375 Comment
  UC107269  Nemophila heterophylla K. Brandegee April 1889 Colusa Stites 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
  JEPS94183  Nemophila menziesii var. menziesii Vernon Oswald and Lowell Ahart 1998-4-21 8949 Colusa Rd. 401 1.8 mi. n. Grapevine Pass (on the Sites-Lodoga Rd.) 472 Comment
  UC1586079  Nemophila parviflora var. parviflora Barbara Ertter 1989-7-1 8614 Colusa ca 12 air mi wsw Stonyford (road to Goat Mt. Lookout, at bend in road, 1.7 mi s of Rt M-10 (Bear Creek-Fouts Spring Rd), at head of South Fork of Stony Creek); South Fork of Stony Creek, rd to Goat Mt. Lookout 1463 Comment
  CDA16097  Nemophila pedunculata G. F. Hrusa 1999-5-16 15046 Colusa North Coast Ranges; Summit of Goat Mtn on N side, on road to Young's Corral, +/- 1/4 mi N of intersection to Goat Mtn Lookout. 1706 Comment
  RSA0000499  Neostapfia colusana Jos Burtt Davy 1898-05 s.n. Colusa Near Princeton. Comment
  JEPS120705  Nicotiana acuminata var. multiflora Lowell Ahart 2013-10-1 19084 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
  RSA0118880  Nicotiana acuminata var. multiflora Lowell Ahart 2013-10-1 19084 Colusa Inner North Coast Range. Strand of East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  UC71879  Nicotiana acuminata var. multiflora H. P. Chandler 1905-9-14 Colusa Princeton Comment
  CAS-BOT-BC231533  Nicotiana glauca Roxana S. Ferris 1926-4-23 6400 Colusa Williams - Stonyford Road near Mountain House Comment
  RSA140854  Nicotiana glauca John H. Thomas 1960-8-29 8846 Colusa About 11 miles SW of Williams along Hwy 20. Comment
  RSA730238  Nicotiana glauca Richard R. Halse 2007-3-25 7123 Colusa Along State Hwy 20, ca 7.8 miles northeast of its junction with State Hwy 16, at base of Salt Canyon. (WGS84) 100 Comment
  CHSC94439  Nicotiana quadrivalvis Lowell Ahart 2006-8-9 13141 Colusa North side and west of the bridge across Stony Creek, just north of Stonyford. 347 Comment
  CAS-BOT-BC227679  Oemleria cerasiformis Craig Thomsen 2008-6-12 2762 Colusa Walker Ridge, vicinity of Elgin Mine. Lucientes Property 655 Comment
  UCD82571  Oemleria cerasiformis Craig Thomsen 2008-6-12 2762 Colusa Walker Ridge, vicinity of Elgin Mine. Lucientes Property. 655 Comment
  UC1187361  Orobanche californica subsp. grayana Herbert L. Mason 1945-7-11 12647 Colusa Near Butte Creek; Butte Lodge Outing Club, 3 miles above Colusa. Comment
  JEPS75712  Orobanche californica subsp. jepsonii L. R. Heckard 1974-9-9 Colusa Trail up from Summit Springs, Snow Mt. Comment
  CAS-BOT-BC502598  Orobanche californica subsp. jepsonii Roxana Stinchfield 1916-7-11 451 Colusa Colusa--Williams Road at trough Comment
  RSA0006070  Orobanche comosa H. P. Chandler 1905-10 s.n. Colusa Princeton Comment
  RSA0076585  Orobanche fasciculata Frank W. Gould 1938-4-22 283 Colusa At head of Capay Valley, west of Arbuckle. Comment
  UCD123224  Orobanche uniflora Betty Hess 1973-4-15 s.n. Colusa 0.5 mile north of State Highway 20 on Bartlett Springs Road. Comment
  SEINET10549723  Orthocarpus purpurascens Houseman 1984-4-28 HOUSEMAN 11 Colusa T15n, r5w, s7. Sw 1/4, 2.9 m w of leesville lodoga junction, brim rd in bear Valley. Collected in moist, open, grassy meadow. Growing with layia, Convolvulus, and lupinus. Flowers pale purple. 418 Comment
  UCD40886  Orthocarpus purpurascens G. Robinson 1984-4-21 3 Colusa About 50 yards west of Wilbur Springs Road on Bear Valley Road. 3.2 miles north of Hwy 20. 390 Comment
  UCD88428  Oryza rufipogon P. B. Kennedy 30-31 May 1922 s.n. Colusa Cortina. Comment
  UCD57070  Oryza sativa Beecher Crampton 1963-9-9 6894 Colusa 1/4 mile E of Cortena. Comment
  UCD70305  Packera breweri D. Sanchez-Mata 1998-7-10 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain Road between Lodoga and Red Rock Cabin. 420 Comment
  JEPS95998  Packera clevelandii Vernon H. Oswald and L. Ahart 1999-6-22 9783 Colusa 1.5 mi west of Stonyford-Lodoga Road on County Road 42 paralleling Little Stony Creek: T17N R6W Sect. 29, ca. 1400 ft, 1180 ft, chaparral, serpentine substrate 426 Comment
  UC1299450  Packera clevelandii Freed W. Hoffman 1947-6-19 1672 Colusa Cooks Springs North Coast Ranges Comment
  UC1552843  Packera clevelandii Frederica Bowcutt 1985-6-19 598 Colusa about 2 mi nw Wilbur Hot Springs (just sw of Bear Valley); Wilbur Springs Quad. 15' Comment
  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
  UCD64040  Packera clevelandii Craig D. Thomsen 2000-6-23 2425 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
  UCD134779  Packera eurycephala John M. Tucker 1968-5-4 4108 Colusa Bear Valley, 8.6 miles (by Bear Valley Road) northwest of junction with State Highway 20. 396 Comment
  CAS-BOT-BC231236  Packera eurycephala var. eurycephala Roxana Stinchfield Ferris 1926-4-23 6454 Colusa Stonyford. Comment
  CHSC70785  Packera eurycephala var. eurycephala B. Castro; D. Isle, L. Hanson, L. Janeway 1995-4-28 565 A Colusa Stonyford area, along the west bank of Salt Creek, beginning ca 20 yds N of Dennis Drive, extending into fenced field to the W and into property to the N of field. 371 Comment
  JEPS118687  Packera eurycephala var. eurycephala David Isle 2011-5-8 1902 Colusa E of Isle home, concen. W of E fenceline. 2253 Dennis Dr, Stonyford in W 5 Ac of S 1/2 of NW 1/4 of SW 1/4 of SE 1/4. Gilmore Peak 7.5' quad. Comment
  UC91676  Packera eurycephala var. eurycephala Brandegee May 1887 Colusa Epperson's Comment
  UCD159330  Packera greenei D. S. Park 2010-6-5 114 Colusa Walker ridge, Cold Spring Mt. roadside, grassland. 760 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
  UC1299386  Paeonia brownii Freed W. Hoffman 1948-6-27 2493 Colusa 8.6 mi sw Fouts Springs (w Colusa Co.); upper Letts Valley 1310 Comment
  CAS-BOT-BC253663  Panicum capillare Roxana Stinchfield 1916-7-10 479 Colusa Davis Tule near Sycamore Slough Comment
  UCD36222  Parapholis incurva Beecher Crampton 1953-4-29 1143 Colusa Colusa County, 2 miles east of Maxwell. Comment
  CAS-BOT-BC413468  Parietaria pensylvanica Roxana Stinchfield 1916-7-8 378 Colusa Sycamore Slough. Stinchfield ranch 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
  UC71653  Pectocarya penicillata Miss Alice King 1905-1 Colusa College City Comment
  UC766200  Pectocarya penicillata R. F. Hoover 1938-4-24 3220 Colusa w Arbuckle; Sand Creek foothills Comment
  UCD57114  Pectocarya pusilla Gordon Harrington; Diana Hickson 2007-4-7 0018 Colusa BLM Payne Ranch, SW of intersection of Hwy 16 and Hwy 20, 3/4 mile WNW of Roadkill Cafe. 470 Comment
  UC1051747  Pediomelum californicum Helen K. Sharsmith 1953-6-21 4304 Colusa ca 1 mi within boundary of Mendocino National Forest (slopes of Little Stoney Creek); Mendocino Nat For, Little Stoney Creek, Inner N Coast Ranges 670 Comment
  UCD161828  Pediomelum californicum James A. Neilson Jr. 1980-6-15 3426 Colusa Wilbur Hot Springs. (Exact location unknown. Coordinates estimated by label maker.) Comment
  UCD66694  Pediomelum californicum Craig D. Thomsen 2000-6-23 2379 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17, about 1/8 of a mile east of Vista Point. 325 Comment
  UCD84548  Pediomelum californicum Ellen Dean; C. Thomsen, T. Hansen, and windfarm meeting 2010-6-11 6146 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
  CHSC43542  Pellaea andromedifolia Lowell Ahart 1976-11-14 1003 Colusa About 3 miles west of Sites. 365 Comment
  CHSC46033  Pellaea mucronata Lowell Ahart 1976-11-14 1004 Colusa On the north side of the Sites Lodoga Road, about 3 miles north-west of Sites. 365 Comment
  HSC44460  Pellaea mucronata R. York 1978-4-22 130 Colusa Bear Valley Rd. 1.5 mi. from its jct. with Hwy. 20 412 Comment
  UCD70232  Pellaea mucronata D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. 350 Comment
  CAS-BOT-BC77156  Pellaea mucronata subsp. mucronata Josh Suchocki; Charlene Vullo; Kyle Wear 1995-4-1 39 Colusa Along Brim Rd. 1.6 miles west of the junction with Bear ValleyRd. (Robber's Flat) 487 Comment
  SEINET3873302  Pellaea mucronata subsp. mucronata Stephen Plant 1978-4-22 212 Colusa Wilber Springs Quad. Bear Valley Road, 1.5 miles from its junction with State Route 20.; 0 411 Comment
  CHSC1851  Penstemon centranthifolius E. Walker 1932-4-18 Colusa Stonyford. 365 Comment
  POM231385  Penstemon heterophyllus subsp. purdyi M. S. Baker 1937-5-17 8659 Colusa Hwy 20, soon after entering hills from Williams. Comment
  NY601769  Penstemon heterophyllus var. purdyi L. Constance 1938-4-22 2148 Colusa Above Salt Creek, Lower Lake-Williams road, 11 miles northeast of Lake-Colusa line, Inner North Coast Ranges. 152.4 Comment
  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
  CHSC42649  Perideridia howellii Vernon Oswald 1986-6-30 2180 Colusa Mill Valley Campground near Letts Lake and Lily Pond. 1188 Comment
  UCD61454  Perideridia kelloggii Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3900 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Just north of the headwaters of Eula Canyon. 339 Comment
  UCD63109  Perideridia kelloggii Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4940 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
  CHSC116397  Perideridia kelloggii David Isle; Frank Pendell 2014-6-16 2135 Colusa North Coast Range. About 2 miles west of Stonyford on the Pendell Ranch. Southeast of the home of Frank and Sheri Pendell about 1/4 mile and northwest of the Stonyford Cemetery about 200 yards (GPS is Pendell home S of Fouts Springs Rd. ~50 yds. 10S -0536687E, 4357699N. Comment
  JEPS73489  Perideridia oregana L. R. Heckard 1972-7-9 3101 Colusa East Peak Snow Mt. (scree slope on se slope) 2011 Comment
  JEPS120701  Persicaria lapathifolia Lowell Ahart 2013-10-1 19090 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
  CHSC80251  Persicaria punctata B. Castro; G. Kuenster 2000-7-19 1201 Colusa Vicinity of Maxwell, Golden Gate in Logan Ridge, Funks Creek, and the Glenn-Colusa canal. 39 Comment
  UC1047026  Phacelia L. R. Heckard and C. R. Bell 1951-6-14 176 Colusa w-facing slope near Stonyford Comment
  UC1047027  Phacelia L. R. Heckard and C. R. Bell 1951-6-14 180 Colusa s-facing slope near Stonyford Comment
  UC71625  Phacelia ciliata var. ciliata Miss Alice King 1905-1 Colusa College City Comment
  UC73691  Phacelia ciliata var. ciliata Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  CHSC62845  Phacelia distans Vernon H. Oswald; Lowell Ahart 1994-3-23 6021 Colusa Goat Mtn. Rd. just W of the bridge over Sullivan Creek, S of Stonyford. Locally common in gravelly serpentine soil on the bank between the road and Little Stony Creek. 505 Comment
  JEPS95504  Phacelia distans Vernon H. Oswald and L. Ahart 1994-3-23 6021 Colusa T16N R7W NE1/4 NW1/4 Sec. 1, 1660 ft, Chaparral. Goat Mtn. Rd. just W of the bridge over Sullivan Creek, S of Stonyford 505 Comment
  CAS-BOT-BC278171  Phacelia distans Mona Bourell 1997-3-29 5807 Colusa Mendocino National Forest along Road near Brittan Ranch, 0.1 mi. N of North Fork Campground Comment
  RSA0021579  Phacelia distans M. Bourell 1997-3-29 5807 Colusa Mendocino National Forest along Road near Brittan Ranch, 0.1 mi. N of North Fork Campground. Comment
  JEPS2352  Phacelia divaricata W. I. Follette 1935-3-31 25 Colusa Tahoe-Ukiah hwy 19.3 mi sw Williams (2.3 mi e of the Colusa-Lake Co. line. on or near Bear Creek, 3 1/2 mi se of Wilbur Spr.) Comment
  CHSC12748  Phacelia egena L. V. Ritter 1969-4-30 227 Colusa Ca 10 mi. sw of Williams, s side of Highway 20. Comment
  UC901824  Phacelia egena L. Constance, R. Bacigalupi, C. R. Bell, and A. H. Holmgren 1950-4-26 3320 Colusa road cut 1 mi se Sites; Stone Corral Creek 76 Comment
  HSC45747  Phacelia heterophylla Stephen Plant 1978-4-22 205 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  HSC47567  Phacelia imbricata Sheila Logan 1978-4-22 67 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  HSC66010  Phacelia imbricata Teri Bartowski, Shane Feusier, Ruth Takaki, Carol Zimmerer 1980-4-19 45 Colusa 5.4 mi. from Lodoga along little Stony Creek at Digger Pine Campground 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
  UCD66695  Phacelia imbricata Craig D. Thomsen 2000-6-23 2381 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  HSC44464  Phacelia tanacetifolia R. York 1978-4-22 141 Colusa Bear Valley Rd., 1.5 mi. from its junction with S.R. 20 409 Comment
  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
  UCR227636  Phalaris aquatica Craig D. Thomsen, Gordon Harrington 2008-7-6 2779 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 20 and 16. Western edge of ranch on ridge above Cache Creek Canyon, along ridge trail 511 Comment
  POM163470  Phalaris lemmonii Roxana S. Ferris 1926-4-21 6282 Colusa 3 mi W of Colusa.. Comment
  CAS-BOT-BC265956  Phalaris minor Roxana S. Ferris 1917-4-12 508 Colusa 4 miles east of Williams Comment
  POM207817  Phalaris paradoxa Jos Burtt Davy 1898-05 s.n. Colusa Near Princeton. Comment
  JEPS71082  Phlox gracilis W. L. Jepson 1932-5-8 16276 Colusa Lodoga, w Colusa Co Lodoga 457 Comment
  SEINET11587800  Phlox gracilis Unknown 2009-3-11 14370 Colusa Williams Comment
  UC83659  Phlox gracilis Katharine Brandegee Apr 1889 Colusa Leesville Comment
  UCR206397  Phlox gracilis George K. Helmkamp, E. A. Helmkamp 2009-3-11 14370 Colusa Inner North Coast Range Foothills, along CA-20, 9.7 miles southwest of Williams, on the north side of Salt Creek 162 Comment
  UCD83810  Phoradendron bolleanum Ellen Dean; G. Harrington, K. Mawdsley, J. Shepard 2010-5-1 5957 Colusa Walker Ridge, along Walker Ridge Road, at intersection with road/trail to Mount Baldy. 880 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
  CAS-BOT-BC135298  Phoradendron serotinum subsp. macrophyllum Roxana Stinchfield 1918-7-12 461 Colusa Sycamore Slough, Stinchfield Ranch Comment
  CHSC85956  Phyla nodiflora var. nodiflora Jenny Marr; Caroline Warren 1998-5-4 Colusa Vicinity of Sites, Stone Corral Creek, and Antelope Valley. 106 Comment
  CHSC80450  Physalis lancifolia Caroline Warren; Jenny Marr, Heidi West 1998-7-1 Colusa Vicinity of Peterson Road and Funks Creek. 91 Comment
  JEPS101225  Physalis lancifolia Dean W. Taylor 1989-8-4 10419 Colusa Colusa National Wildlife Refuge, along Ohm Road 39 Comment
  RSA140862  Physalis lancifolia John H. Thomas 1960-8-30 8866 Colusa About 5 miles northwest of College City along road to Sycamore. Comment
  SD236433  Physalis lancifolia G. K. Helmkamp, E. A. Helmkamp 2008-10-14 14270 Colusa Sacramento Valley: along CA-20, 2 miles west of Meridian 14 Comment
  UCD81734  Pickeringia montana Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5736 Colusa Walker Ridge. Along Walker Ridge Road, just S of turn off to Indian Valley Reservoir. 840 Comment
  CAS-BOT-BC242677  Piptatherum miliaceum Ellen Dean; C. Thomsen; G. Harrington; Davis Botanical Society 2010-6-5 6082 Colusa Walker Ridge. Along Walker Ridge Road on southern part of the ridge, south of turnoff to Indian Valley Reservoir 683 Comment
  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
  CHSC29710  Plagiobothrys bracteatus K. R. Stern 1980-6-1 6636 Colusa Vernal pool, south central border area of Colusa National Wildlife Refuge. 45 Comment
  UCD82474  Plagiobothrys bracteatus Craig Thomsen; G. Harrington 2009-5-12 2852 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  CAS-BOT-BC230037  Plagiobothrys canescens Stephanie Castle; 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. 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, north of Craig Creek 304 Comment
  CHSC86878  Plagiobothrys canescens B. Castro 2003-3-28 1406 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 256 Comment
  UCD120813  Plagiobothrys canescens Alpaslun Ongun 1961-4-16 37 Colusa Bear Valley, 8 miles north of State Highway 20. Comment
  UCD80898  Plagiobothrys fulvus Ellen Dean; w/ Destanella Flat Tour 2009-3-28 5298 Colusa BLM Bear Creek (Payne) Ranch, lands to the SW of the jct of Hwys 16 and 20. Destanella Flat, just E of the Lake County border, ca. 3.4 road miles west of Hwy 16 along Hwy 20, south side of Hwy 20. 560 Comment
  UCD163215  Plagiobothrys fulvus var. campestris Craig D. Thomsen 2000-3-31 2167 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
  CHSC81232  Plagiobothrys greenei Jenny Marr; Heidi West, Caroline Warren 1998-4-16 Colusa Vicinity of Grapevine Creek and Antelope Valley. 134 Comment
  CHSC89833  Plagiobothrys greenei B. Castro; S. Innecken 2001-3-19 1214 Colusa Vicinity of Maxwell, Golden Gate in Logan Ridge, Funks Reservoir, and the Glenn-Colusa canal. 48 Comment
  UCD66939  Plagiobothrys greenei Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5088 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
  CHSC112921  Plagiobothrys humistratus B. Castro; L. Janeway, Robin Carter 2010-3-23 1803 Colusa Vicinity of Golden Gate in Logan Ridge, Funks Reservoir, and the Tehama-Colusa canal in distrubed, grazed annual grassland. 121 Comment
  UC78046  Plagiobothrys infectivus Katharine Brandegee Apr 1889 Colusa Leesville Comment
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  JEPS80194  Plagiobothrys nothofulvus L. R. Heckard and J. Hickman 1980-7-3 5347 Colusa ca 10 mi w Stonyford (just w of Summit Springs, sw of Snow Mt., Colusa-Lake County boundary) 1548 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
  POM63665  Plagiobothrys stipitatus Roxana S. Ferris 1917-4-12 533 Colusa 4 miles east of Williams. Comment
  RSA10708  Plagiobothrys stipitatus C. B. Wolf 1928-5-8 2123 Colusa Sacramento Valley. 3 mi. S of Arbuckle Comment
  UC71649  Plagiobothrys stipitatus Miss Alice King 1905-1 Colusa College City Comment
  CHSC107154  Plagiobothrys stipitatus var. micranthus L. P. Janeway; B. Castro 2011-5-19 10283 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 1.8 km southeast of Funks Reservoir and 0.1 km northeast of Tehama-Colusa Canal. Large +- alkaline vernal pool/marsh; mucky clay soil. Occasional groups of this in some parts of the marsh (no standing water now, but still mucky). 49 Comment
  POM63664  Plagiobothrys stipitatus var. micranthus Roxana S. Ferris 1917-4-12 534 Colusa 4 miles east of Williams. Comment
  SEINET3287497 Image available Plagiobothrys stipitatus var. micranthus George K. Helmkamp, E. A. Helmkamp 2009-3-11 14359 Colusa Sacramento Valley; along CA-20, 1.6 miles southwest of Colusa and just north of Colusa National Wildlife Refuge. 15 Comment
  UCR212317  Plagiobothrys stipitatus var. micranthus Craig D. Thomsen 2000-4-12 2096 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mi west of Hwy 20/16 intersection, milepost 3.00 310 Comment
  JEPS61053  Plagiobothrys stipitatus var. stipitatus Alice King May 1906 Colusa College City Comment
  HSC31306  Plagiobothrys tenellus Carter Schleicher 1974-5-4 23 Colusa 0.75 mi. from T junction of Walker Ridge Rd. and Indian Valley, near Clyde Mine 854 Comment
  JEPS90081  Plagiobothrys tenellus Dean W. Taylor 1992-4-16 12402 Colusa hillsides ca. 0.4 mi. due w. from spillway into Little Stony Creek (East Park Reservoir); Inner N. Coast Range, Gilmore Peak Quad. 411 Comment
  JEPS95520  Plagiobothrys tenellus Vernon H. Oswald and L. Ahart 1994-4-6 6069 Colusa T17N R7W SE1/4 SW1/4 Sec. 36, 1540 ft, Chaparral. Goat Mtn. Rd. at Sullivan Creek, 1.2 mi SW of Digger Pine Flat, S of Stonyford. Occasional populations in openings in brush on the rocky slopes (serpentine) bordering Sullivan Creek. 469 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
  CHSC94420  Plantago coronopus Lowell Ahart 2006-8-9 13154 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UC1584634  Plantago coronopus Dean W. Taylor 1988-3-24 9460 Colusa ca 0.5 mi n Ware Road (on Ohm Road); Sacramento Valley, Colusa National Wildlife Refuge 24 Comment
  SD225882  Plantago elongata Carol Witham, Jennifer Buck and Vernal Pool Team 2001 2001-4-30 153 Colusa 2 mi south of the town of Colus along Hwy 20, east of Hwy 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001, UTMs: 10S0587786;4336302 Comment
  UCSC009428  Plantago elongata Lowell Ahart 2015-4-28 20114 Colusa On the north side of Maxwell-Colusa Road, about 5 1/2 miles east of Maxwell 53 Comment
  CHSC86027  Plantago erecta Jenny Marr; H. West, J. Lacey, C. Warren, N. Wight 1998-4-14 Colusa Vicinity of Grapevine Creek, Antelope Valley, and Sites-Lodoga Road. Pasture. 121 Comment
  CHSC86120  Plantago erecta Jenny Marr; Heidi West, Joyce Lacey-Rickert, Caroline Warren 1998-5-8 Colusa Vicinity of Sites and Antelope Valley. 152 Comment
  HSC72167  Plantago erecta J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9542 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  JEPS120973  Plantago erecta Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18632 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
  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
  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
  CHSC23889  Platystemon californicus D. Joley 1968-3-30 Colusa Found on hwy. 20 ca. 20 mi e of Clearlake. Comment
  CHSC79537  Platystemon californicus Simona Altman 1999-4-3 53 Colusa Bear Valley, Bear Valley Rd. 396 Comment
  UCD56922  Platystemon californicus Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3525 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Near headwaters of Craig Canyon. 359 Comment
  UCR52384  Platystemon californicus R. Earing, C. Cavanaugh, C. Collins 1987-4-12 80 Colusa Bear Valley Comment
  CAS-BOT-BC91597  Platystemon californicus K. Brandegee 1889-4-1 s.n. Colusa Unspecified. Comment
  HSC72768  Platystemon californicus J. Krajanowski 1981-4-4 3 Colusa .3 mi. W of junction of Hwy. 20 and Hwy. 16, S side of Bear Creek, 18 mi. SW of Williams 322 Comment
  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
  SFV8387  Platystemon californicus L. E. Miller 1973-4-15 12 Colusa Middle of Bear Valley, north of State Highway 20. Roadside. Comment
  UCD14423  Platystemon californicus R. M. Rhode 1984-4-21 s.n. Colusa Colusa Co.; Bear Valley, 10 miles north of Intersection of Highways 16 and 20; 426 Comment
  UCD67939  Platystemon californicus D. Rhode 1977-4-30 2 Colusa 0.6 mi. W. Bear Creek, pasture near roadside. 403 Comment
  CHSC115381  Platystemon californicus var. californicus Lowell Ahart 2015-4-1 20002 Colusa Along Bear Valley Road, in Bear Valley, about 50 yards west of Bear Creek, about 6 miles south of Leesville, about 6 miles north of Highway 20. Inner North Coast Range. 395 Comment
  POM158154  Platystemon californicus var. californicus Lyman Benson 1935-3-27 6335 Colusa 2 mi W of Williams. Inner N Coast mtn range, Sacramento River watershed. 122 Comment
  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
  CDA34081  Plectritis ciliosa P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  JEPS87663  Plectritis ciliosa subsp. ciliosa Vernon H. Oswald and Lowell Ahart 1994-4-6 6066 Colusa 1.2 mi sw of Digger Pine Flat (s of Stonyford, Goat Mountain Road at Sullivan Creek); Sullivan Creek, Goat Mountain Road 469 Comment
  UC1018914  Plectritis ciliosa subsp. ciliosa S. C. Dyal, A. Carter, E. Crum 1938-5-7 712 Colusa Colusa County Comment
  UCD81235  Plectritis congesta subsp. brachystemon Barry Rice; E. Dean, G. Harrington, J. Alderson, M. Bibbo 2009-3-25 s.n. Colusa Bear Creek (formally Payne) Ranch. Lands to the SW of the jct of Hwys 20 and 16. Southern part of the ranch on the south side of a canyon that is immediately north of Brophy Canyon. 274 Comment
  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
  CHSC86875  Plectritis macrocera B. Castro 2003-4-1 1410 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. On cutbank of dirt road which contours along hillside. 185 Comment
  JEPS95488  Plectritis macrocera Vernon H. Oswald and L. Ahart 1994-4-6 6067 A Colusa T17N R7W SE1/4 SW1/4 Sec. 36, 1540 ft, Chaparral. Goat Mtn. Rd. at Sullivan Creek, 1.2 mi SW of Digger Pine Flat, S of Stonyford 469 Comment
  UC1053421  Plectritis macrocera Rimo Bacigalupi, Arthur Holmgren 1950-4-26 3171 Colusa 7.7 mi w of Sites (Grapevine Grade to Lodoga); Grapevine Grade Comment
  UC999822  Plectritis macrocera S. C. Dyal, A. Carter, E. Crum 1938-5-7 696 Colusa south central Colusa County Comment
  UCD63007  Poa annua Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4660 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Near corral on west side of Bear Creek just south of Hwy 20. 319 Comment
  UCD57879  Poa bulbosa Gordon Harrington; Diana Hickson, Jack Alderson 2007-4-29 54 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
  UCD64418  Poa bulbosa Craig D. Thomsen 2000-3-11 2166 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
  UCD82624  Poa pratensis Craig Thomsen; G. Harrington 2009-5-12 2894 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  UCD163221  Poa secunda Craig D. Thomsen 2000-4-12 2142 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
  UCD57110  Poa secunda Gordon Harrington; Diana Hickson 2007-4-7 0020 Colusa Colusa Co. Ca. BLM Payne Ranch, SW intersection of Hwy 16 and Hwy 20, approx. 1/2 m WNW of Roadkill Cafe. 463 Comment
  CAS-BOT-BC236332  Poa secunda subsp. secunda Roxana S. Ferris 1926-4-23 6583 Colusa Field 2 miles from Stonyford Comment
  CHSC77408  Poa secunda subsp. secunda Heidi West; Beth Hendrickson, Natalie Wight 1999-3-25 Colusa Vicinity of Antelope Valley and Sites. 121 Comment
  JEPS80396  Poa secunda subsp. secunda L. R. Heckard and J. Hickman 1981-6-22 5629 Colusa below (s of) Dark Hollow trail Snow Mt 1981 Comment
  UC883695  Pogogyne douglasii A. A. Heller 1916-6-9 12387 Colusa Coast Range about 2 miles west of Leesville Comment
  CHSC107975  Pogogyne zizyphoroides B. Castro; Robin Carter, Jessica Boyt 2011-4-25 1858 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; ca I mi southeast of Funks Reservoir and 0.2 mi northeast of Tehama-Colusa Canal. Large +- alkaline vernal pool/marsh. In vernal pool in compacted E-W road track that goes through marsh. 49 Comment
  CAS-BOT-BC110510  Polygonum Roxana Stinchfield 1916-7-11 468 Colusa Davis Tule near Sycamore Slough. Comment
  CDA22742  Polygonum amphibium var. emersum P. Steinbaugh, Goodwin 1932-10-1 Colusa Near Grand Island. 0 Comment
  CDA2777  Polygonum persicaria L. Ahart 2006-8-9 13132 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 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
  RSA724951  Polypogon interruptus L. Ahart 2006-8-9 13159 Colusa between the southwest 1/4 and southeast 1/4; under the bridge across Stony Creek, just north of Stonyford. 348 Comment
  CHSC94413  Polypogon maritimus Lowell Ahart 2006-8-9 13171 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS75436  Polypogon monspeliensis W. L. Jepson 1934-5-3 16602 Colusa n Colusa (Stegeman Sta.) 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
  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
  JEPS80814  Polystichum imbricans subsp. imbricans L. R. Heckard and J. C. Hickman 1981-7-31 5787 Colusa e side Snow Mt. (Fouts Springs Overlook) 1783 Comment
  CAS-BOT-BC102381  Populus fremontii Roxana S. Ferris 1917-4-17 624 Colusa Sycamore, Sycamore Slough Comment
  RSA724221  Populus fremontii Richard R. Halse 1988-2-14 3536 Colusa Along State Hwy 20 where it crosses over Salt Creek at the E end of Salt Canyon. 100 Comment
  UCD81255  Populus fremontii Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5420 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
  SEINET3892428  Potamogeton diversifolius 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.; 0 511 Comment
  UCD35976  Potamogeton nodosus Beecher Crampton 1963-8-5 6870 Colusa 1/4 mile E Cortena. Comment
  UCR225398  Potamogeton pusillus Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5108 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
  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
  UCD82732  Potentilla Craig Thomsen; G. Harrington 2009-5-14 2911 Colusa Colusa County on Walker Ridge: south of spur road about 1/2 mile east of Walker Ridge Road, en route to Eaton Springs. 813 Comment
  JEPS27878  Proboscidea louisianica subsp. louisianica Richard Snow 1958-8-3 672 Colusa on road to Leesville near Hwy 20 Comment
  UC914241  Proboscidea louisianica subsp. louisianica Verne Grant and Alva Grant 1946-8-6 7842 Colusa 4 mi nw Colusa (e Colusa Co.); West Butte Ranch Comment
  JEPS24495  Proboscidea lutea J. H. Thomas 1960-8-29 8847 Colusa along Hwy 20 about 11 mi sw Williams Comment
  UCD67100  Prunus emarginata Ellen Dean; Davis Botanical Society 2008-5-31 5027 Colusa west of I-5 at Maxwell, Goat Mountain, ridge below summit off of Goat Mountain Road. 1734 Comment
  CHSC91164  Prunus virginiana var. demissa D. Isle 2003-6-24 377 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. GPS: 10S 0523825E 4346753N. 1767 Comment
  UC1299163  Prunus virginiana var. demissa Freed W. Hoffman 1948-6-27 2523 Colusa 8.5 mi sw of Fauts Springs (western Colusa County); North Coast Ranges Comment
  JEPS108724  Pseudognaphalium californicum Lowell Ahart 2006-6-15 12791 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
  UCD159336  Pseudognaphalium californicum D. S. Park; E. Dean 2010-6-5 120 Colusa Walker ridge, Cold Spring Mt. roadside on exposed slope. 935 Comment
  CHSC113053  Pseudognaphalium luteoalbum Lowell Ahart 2013-10-1 19097 Colusa Inner North Coast Range. Strand of East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  JEPS120796  Pseudognaphalium stramineum Lowell Ahart 2013-10-1 19070 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
  JEPS40460  Psilocarphus brevissimus var. brevissimus W. L. Jepson 1934-5-3 16598 Colusa College City Comment
  UCD58125  Psilocarphus tenellus Ellen Dean; PLB 102 Class 2007-4-29 3721 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
  UCD116917  Ptelea crenulata K. Esau; D. Hartmann 1941-7-17 s.n. Colusa Between Williams and Clear Lake, U.S. #20. Comment
  UC1738833  Puccinellia simplex Dean W. Taylor 1988-3-24 9462 Colusa Colusa National Wildlife Refuge, on Ohm Road ca. 0.5 miles North of Ware Road 24 Comment
  JEPS15216  Purshia tridentata var. tridentata Rimo Bacigalupi with L. T. Dempster, Mrs. P. A. Munz and G. T. Robbins 1956-7-25 5747 Colusa about 0.75 mi w Fouts Camp (s shoulder of Snow Mountains, Colusa-Lake County boundary); Snow Mountains 1905 Comment
  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
  UCD83633  Quercus berberidifolia Fanny Ye; with PLB 102 class 2010-5-2 4 Colusa East slope of Walker Ridge. Along Brim Road, between Bear Valley and Walker Ridge. 493 Comment
  UC993116  Quercus douglasii J. M. Tucker 1948-9-22 1869 Colusa 11.3 mi w Williams (beside road to Venado) Comment
  UC993122  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
  UCD13383  Quercus durata Charles Martin 1986-5-17 31 Colusa 5.7 miles west of Stonyford, along Foot Springs Rd. 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
  HSC71305  Quercus durata var. durata Thomas W. Nelson, Jane P. Nelson 1979-4-12 4621 Colusa Along Stony Creek below Digger Pine Campground Comment
  UC1299701  Quercus garryana Freed W. Hoffman 1948-6-26 2517 Colusa n side Goat Mt. (near forks of Stonyford and Goat Mt. roads, w Colusa County) 1653 Comment
  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
  SBBG111415  Quercus palmeri J. M. Tucker 1991-8-19 4496 -a Colusa across Sulphur Crk from and SE of the hotel at Wilbur Springs 426 Comment
  UCD14524  Quercus palmeri Roger Raiche 1990-12-2 A Colusa California, Colusa Co.; across Sulphur Creek from Wilbur Springs; Comment
  UCD14525  Quercus palmeri Roger Raiche 1990-12-2 B Colusa California, Colusa Co.; across Sulphur Creek from Wilbur Springs; Comment
  UCD14527  Quercus palmeri Roger Raiche 1990-12-2 D Colusa California, Colusa Co.; across Sulphur Creek from Wilbur Springs; Comment
  JEPS80372  Quercus vacciniifolia L. R. Heckard and J. Hickman 1981-6-22 5604 Colusa s side East Ridge of East Peak; Snow Mt. 1920 Comment
  JEPS80248  Quercus wislizeni L. R. Heckard, and J. Hickman 1980-9-15 5427 Colusa below Summit Springs (Lake-Colusa County boundary); Snow Mt. 1524 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
  UCD55459  Quercus wislizeni Ellen Dean; Gordon Harrington 2006-10-6 3283 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
  UCD72390  Quercus wislizeni var. frutescens Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5116 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Southwestern edge of ranch above Cache Creek Canyon along ridge trail. 548 Comment
  UCD84512  Quercus wislizeni var. frutescens Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6063 Colusa Colusa County. On Lake County border. Walker Ridge. Along Walker Ridge Road, between Cold Spring and Buck Flat. 971 Comment
  UC768665  Rafinesquia californica R. F. Hoover 1938-4-24 3211 Colusa Upper Sand Creek Comment
  UCD159337  Rafinesquia californica D. S. Park; E. Dean 2010-6-5 121 Colusa Walker ridge, Cold Spring Mt. roadside on exposed slope. 935 Comment
  POM312419  Ranunculus bongardii G. Thomas Robbins, S. Galen Smith 1950-4-15 1907 Colusa Colusa County: In wet mud and vernal pool, Bear Valley Comment
  SEINET8699529  Ranunculus hebecarpus R. R. Halse 2013-3-26 8739 Colusa Along the Leesville Road ca 5.6 miles NW of its junction with CA Hwy 20, W of Williams. 157 Comment
  UCD169733  Ranunculus hebecarpus Richard R. Halse 2013-3-26 8739 Colusa Along the Leesville Road ca. 5.6 miles northwest of its junction with State Hwy. 20, west of Williams. 157 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
  UCSB63942  Ranunculus hebecarpus McBride, Marjorie 1986-4-5 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. Wilbur Springs Quadrangle, 15'. E central border of Sect, 32. T15N, R4W. 143 Comment
  UCD163699  Ranunculus occidentalis Craig Thomsen 1999-5-10 2005 Colusa Bear Valley. About 8 miles north of Hwy 20. Comment
  UCD82500  Ranunculus occidentalis Craig Thomsen; G. Harrington 2009-5-12 2859 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 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
  UCR206694  Raphanus raphanistrum George K. Helmkamp, E. A. Helmkamp 2009-3-11 14364 Colusa Inner North Coast Range Foothills, along CA-20, 9.7 miles southwest of Williams, on the north side of Salt Creek 162 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
  UCR257577  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
  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
  CDA15463  Rhamnus tomentella subsp. crassifolia G. F. Hrusa, WTD 1998-6-19 14599 Colusa North Coast Ranges; Little Stony Creek. Goat Mtn. Rd. ~ 1 km. W of intersection with Lodoga-Stonyford Rd. Comment
  CHSC88560  Rhamnus tomentella subsp. crassifolia L. P. Janeway; B. Castro 2001-6-3 7096 Colusa Inner North Coast Ranges. Spring near head of Doyle Canyon on east side of Walker Ridge, about 2.7 km (air) south of Bartlett Springs Road. 799 Comment
  CDA21477  Rhododendron occidentale G. F. Hrusa 1989-5-7 6047 Colusa North Coast Ranges; Confluence of Little Stony Creek and Frenzel Creek at the Frenzel Ck. Research Natural Area. Mendocino National Forest. Comment
  UCD117976  Rhododendron occidentale A. T. Leiser 1985-5-19 LO Colusa Between 3-4 miles along Frenzel Creek as it parallels the road M5 from Lodoga to Goat Mtn. Frenzel Creek is on S. side of road and down 30-40 ft. Populations are scattered in full sun on both sides of the creek. Comment
  HSC71304  Rhus aromatica Thomas W. Nelson, Jane Nelson 1979-4-12 4622 Colusa Along Stony Creek below Digger Pine Campground Comment
  UCD82135  Rhus aromatica Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5667 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 869 Comment
  POM174573  Rhus trilobata var. quinata Roxana S. Ferris 1926-4-23 6590 Colusa 2 miles from Stony Ford. Comment
  CAS-BOT-BC108891  Ribes divaricatum var. pubiflorum F. G. Renner 1924-6-25 653 Colusa Upper Letts Valley. 1371 Comment
  JEPS15562  Ribes lobbii G. Thomas Robbins with L. R. Heckard 1956-7-25 3718 Colusa about 50 yards below summit Snow Mt. West (ridge between east and west peaks of Snow Mt.); Snow Mt. 2133 Comment
  CAS-BOT-BC168901  Ribes malvaceum Eric Peterson; Matt Foruria; Tom Ward 1995-4-2 59 Colusa 4.3 north on Walker Ridge Road from jct with Hwy 20 822 Comment
  UCD80841  Ribes malvaceum Jack Alderson 2009-2-21 22 Colusa BLM Payne Ranch (Bear Creek Ranch), lands to the SW of intersection of Hwys 16 and 20. South side of Brophy Canyon. 426 Comment
  UCD97118  Ribes malvaceum Ellen Dean; G. Harrington, J. Alderson 2011-4-10 6901 Colusa Along Brim Rd on east slope of Walker Ridge (Brim Rd becomes Bartlett Springs Rd). 438 Comment
  UCR281724  Ribes malvaceum David Isle 2015-6-20 2156 Colusa North Coast Range, c. 4 miles west of Stonyford, southeast of curve at culvert crossing just east of old dumpsite road junciton, uphill c. 200 ft south of 18N01 439 Comment
  HSC31993  Ribes malvaceum Steven Lagos 1974-5-4 59 Colusa Along roadside 747 Comment
  UCR243003  Ribes quercetorum Gordon Harrington 2012-2-14 s.n. Colusa N side of Hwy 20 and Salt Creek Canyon between Hwy 16 and the Central Valley. Bear Valley Ranch property 306 Comment
  CAS-BOT-BC293684  Ribes roezlii Mona Bourell 1997-3-29 5770 Colusa Mendocino National Forest. Dixie Glade Campground 918 Comment
  SFV14515  Ribes roezlii M. L. Vincent 1968-6-6 786 Colusa Goat Mountain Road, 1 mile from Stony Ford turnoff. 1825 Comment
  JEPS75851  Ribes roezlii var. cruentum L. R. Heckard 1974-9-10 3897 Colusa e slope East Peak; Snow Mt. 2103 Comment
  CAS-BOT-BC173957  Ribes viscosissimum Volney Rattan 1884-6-1 s.n. Colusa Black Butte. Coast Mts. North of San Francisco Bay Comment
  CAS-BOT-BC362902  Rigiopappus leptocladus James Jokerst 1985-4-4 2202 Colusa Near Rail Canyon Comment
  CHSC86965  Rigiopappus leptocladus B. Castro; Michelle Cedarborg 2003-5-6 1428 Colusa Vicinity of Logan Ridge, Sites Peak and Lurline Creek. 188 Comment
  HSC62787  Rigiopappus leptocladus J. M. DiTomaso 1979-4-14 876 Colusa Bear Valley Rd., 3.9 mi. N of S.R. 20, next to Bear Creek. 412 Comment
  UC903228  Rigiopappus leptocladus Ethel Crum 1932-5-8 1452 Colusa Stonyford Inner North Coast Ranges 426 Comment
  UCD163332  Rigiopappus leptocladus Craig D. Thomsen 2009-5-3 2801 Colusa Walker Ridge. Vicinity of Walker Ridge Rd., about 0.5 miles north of Hwy 20. 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
  UCR212316  Rigiopappus leptocladus Craig D. Thomsen 2000-4-12 2131 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mi west of Hwy 20/16 intersection, milepost 3.00 310 Comment
  UCR261656  Rigiopappus leptocladus Ann Howald 2003-4-24 2324 Colusa Inner North Coast Ranges, Indian Valley, west side of East Park Reservoir, west side of Little Stony Creek, near service road 356 Comment
  JEPS80179  Rigiopappus leptocladus L. R. Heckard with J. Hickman 1980-7-3 5331 Colusa just w Summit Springs (sw <side of?> mt., ca 10 mi w of Stonyford, Colusa-Lake Co. boundary); Snow Mt. 1548 Comment
  CAS-BOT-BC147382  Rosa californica Roxana Stinchfield 1916-7-8 384 Colusa Sycamore Slough, Stinchfield Ranch 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
  UC1051706  Rosa gymnocarpa Helen K. Sharsmith 1953-7-1 4405 Colusa near Old Mill Camp; Inner North Coast Ranges, Mendocino National Forest, Trough 1036 Comment
  CAS-BOT-BC110478  Rumex Roxana Stinchfield 1916-7-9 418 Colusa Overflow land on Sacramento River - Phillips Ranch. Comment
  UCD82155  Rumex conglomeratus Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5681 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 843 Comment
  UCD61462  Rumex crispus Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3908 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1 mile SW of parking lot. 390 Comment
  UCD61482  Rumex crispus Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3908 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1 mile SW of parking lot. 390 Comment
  CAS-BOT-BC433469  Rumex dentatus Roxana S. Ferris 1926-4-21 6285 Colusa 3 miles west of Colusa 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
  UCR206365  Rumex pulcher George K. Helmkamp, E. A. Helmkamp 2009-5-20 14745 Colusa Inner North Coast Ranges, along CA-16 at 'Cowboy Camp' 1.0 mile south of the junction with CA-20, adjacent to Bear Creek 332 Comment
  CHSC79280  Sagina apetala B. Castro; L. P. Janeway 2000-4-10 1063 Colusa Vicinity of Sites in rolling hills near Sulphur Gap, among un-named tributaries to Lurline Creek. 91 Comment
  JEPS80761  Sagina saginoides L. R. Heckard and J. C. Hickman 1981-7-30 5728 Colusa s.e. side Snow Mt. (Trout Creek crossing) 1828 Comment
  POM313039  Sagittaria calycina H. L. Mason, Verne Grant 1946-8-6 12961 Colusa Pond on Colusa-Marysville Hwy, 4 miles S of Colusa, west side of Sacramento River. Comment
  SBBG115378  Sagittaria latifolia J. McCaskill, Mr. Harvey, L. Davis 1954-8-9 365 Colusa Butte Crk, ca. 4 mi E of Colusa, on E side of Sacramento River Comment
  UCD138041  Sagittaria latifolia Herbert L. Mason 1945-9-19 12713 Colusa Sacramento river, 1 mile north of Colusa on east side, below causeway. Comment
  UCD138036  Sagittaria montevidensis subsp. calycina Herbert L. Mason; Verne Grant 1946-8-7 12981 Colusa 8 miles north of Colusa. Comment
  UCD138042  Sagittaria montevidensis subsp. calycina June McCaskill; W. A. Harvey 1954-8-9 366 Colusa Grimes - Knights Landing Highway, ca. 3 miles south of Grimes. Comment
  CAS-BOT-BC102859  Salix breweri C. Hart Merriam 1907-7-23 s.n. Colusa Cook Springs Comment
  CHSC70904  Salix breweri Vernon H. Oswald; Lowell Ahart 1998-4-21 8944 Colusa Stonyford-Lodoga Rd. 3.7 mi south of Stonyford. 384 Comment
  HSC71300  Salix breweri Thomas W. Nelson, Jane Nelson 1979-4-12 4626 Colusa Along Stony Creek below Digger Pine Campground Comment
  UCD63618  Salix breweri Craig D. Thomsen 1999-5-12 2032 Colusa BLM Payne Ranch. Approximately 0.5 mile southwest of intersection of Hwy 16 and Hwy 20. Along ephemeral drainage west of large hillslope/peak. Comment
  JEPS80787  Salix exigua L. R. Heckard and J. C. Hickman 1981-7-30 5760 Colusa se side Snow Mt. (Trout Creek) 1600 Comment
  UC1786437  Salix exigua var. hindsiana Edward L. Smith 1965-4-16 659 Colusa One mile east of Colusa. 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
  CDA16094  Salix lasiolepis G. F. Hrusa 1999-5-16 15049 Colusa North Coast Ranges; Goat Mountain on S side. 1722 Comment
  JEPS122457  Salix lasiolepis David Isle with David Toren 2003-6-24 2128 Colusa Mendocino National Forest. NE border of Veratrum spring & meadow, 1/4 mi E of Goat Mtn Rd 16N03 junction w/Horse Glade Rd; (with flowing water) Comment
  JEPS86636  Salix lasiolepis L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-18 6686 Colusa sw flank Snow Mt. (n side of West Peak) 2000 Comment
  UCD111629  Salix lasiolepis G. F. Hrusa 1996-2-26 12636 Colusa Little Stony Creek, Goat Mtn. Rd. approx. 3 miles SW of intersection with Stonyford-Lodoga Rd. 475 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
  CHSC101023  Salix lasiolepis var. lasiolepis John Dittes; Josephine Guardino 2008-3-14 1515 Colusa Great Central Valley; Sacramento Valley; butween Butte Sink and Sacramento River, north of Sutter Buttes; ca. 1.6 air mile south of Gridley Road, ca. 1.1 air mile west of Drumheller Slough. 17 Comment
  JEPS110140  Salix lasiolepis var. lasiolepis Lowell Ahart 2006-8-9 13147 Colusa Gravel bar, north side and 30 yards west of the bridge across Stony Creek, just north of Stonyford 347 Comment
  CDA5812  Salpichroa origanifolia Agricultural Commissioner 1960-3-29 Colusa 0 Comment
  JEPS98267  Salsola soda Vernon H. Oswald and Joseph G. Silveira 2000-10-12 9978 Colusa Delevan National Wildlife Refuge; adjacent to the main refuge road 0.2 mi N of Maxwell-Colusa Road 18 Comment
  RSA718219  Salsola soda L. Ahart 2006-9-26 13348 Colusa Between the deep ditch and the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5.5 miles east of Maxwell. 24 Comment
  CDA12015  Salvia columbariae G. F. Hrusa 1990-4-8 7667 Colusa North Coast Biodiversity Arena; Road into Bear Valley from the S, passing Wilbur Springs, and originating at Hwy. 20. 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
  HSC44458  Salvia columbariae R. York 1978-4-22 128 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  HSC66000  Salvia columbariae C. Macdonald, P. Powers, C. Raley, J. Spitler, D. Stamp 1980-4-19 51 Colusa Leesville Rd. from Leesville to Williams, 3.8 mi. E of Leesville Comment
  HSC87083  Salvia columbariae L. Blackford, S. Branch, D. Malm 1988-4-16 48 Colusa 6.1 mi. on Walker Ridge Road off Hwy 20 at Blue Oak campground 732 Comment
  JEPS62672  Salvia columbariae R. F. Hoover 1938-4-24 3228 Colusa ridge between Venado and Leesville (e of Leesville) Comment
  UCD41199  Salvia columbariae James Salyards 1986-5-17 86 - Colusa Along Sites-Lodoga Road, 8.2 mi. west of Sites. Comment
  CAS-BOT-BC238630  Sambucus nigra subsp. caerulea Roxana Stinchfield 1916-7-8 389 Colusa Sycamore Slough, Stinchfield ranch Comment
  SEINET13945139 Image available Sanicula bipinnatifida Jack Major, Eilif Dahl 1962-1 sn Colusa Bear Valley Comment
  UCD66530  Sanicula crassicaulis Craig D. Thomsen 2000-4-12 2153 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  CHSC42673  Sanicula tuberosa Vernon Oswald 1986-3-25 1052 Colusa Fouts Spring Rd. (M10) 0.5 mi e of John Smith Rd. (M5). 548 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
  UCR206666  Scandix pecten-veneris George K. Helmkamp, E. A. Helmkamp 2009-3-17 14390 Colusa Inner North Coast Ranges Foothills, along CA-16 and Bear Creek, 4.3 miles south of the junction with CA-20 261 Comment
  CHSC110853  Schoenoplectus acutus var. occidentalis David Isle; Rhonda Isle 2013-6-27 2046 Colusa Above (S of) 18N01, ~200 yards NW of jct with OHV Trail 17N12; (~3/4 mi SW of Fouts Springs Loop Rd, E side). 670 Comment
  UCD163662  Schoenoplectus acutus var. occidentalis Craig Thomsen 1998-6-10 1960 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  HSC79767  Schoenoplectus acutus var. occidentalis E. Parreno 1968-3-29 45 Colusa Below turnoff on Hwy. 20, 1 mi. W of intersection of Hwy. 20 and Hwy. 16 Comment
  CHSC83435  Schoenoplectus americanus Bill Maslach 2001-6-6 13 Colusa About 17 km east of Hwy. 5 along Hwy 20. Intersection of Salt Cr. and Hwy. 20; about 50 m downstream of bridge marked '1930.' On creek bank and in creek. 175 Comment
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Jul 20 2006
  CHSC83466  Schoenoplectus americanus Bill Maslach 2001-6-6 11 Colusa Intersection of Salt Cr. and Hwy. 20; downstream of bridge marked '1930.' On creek bank. 175 Comment
  SEINET9763234 Image available Schoenoplectus glaucus Richard Carter 2006-7-31 Colusa 3.7 mi SSE Colusa, jct. Hwy CA 20 and Hwy CA 45 Comment
  UCD49961  Schoenoplectus mucronatus June McCaskill 1954-8-9 359 Colusa Ca. 2 miles E of Princeton and 300 yards S of Glenn County line. Comment
  UCD163854  Schoenoplectus pungens var. longispicatus Craig D. Thomsen 2001-4-12 2471 Colusa Bear Valley. About 7 miles north of Hwy 20. 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
  UC1100923  Scirpus maritimus Herbert L. Mason, Verne Grant 1946-8-6 12965 -A Colusa four mi s Colusa (w side Sacramento River, pond on Colusa-Marysville Highway); w side Sacramento River, s of Colusa Comment
  CHSC62952  Scribneria bolanderi Vernon H. Oswald; Lowell Ahart 1994-4-6 6059 Colusa Goat Mtn. Rd. 0.8 mi SW of Digger Pine Flat, S of Stonyford. Flat bordering the road. 481 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
  JEPS80261  Scutellaria californica L. R. Heckard and J. Hickman 1980-9-15 5441 Colusa n of road at Summit Springs; Snow Mountain, Summit Springs 1524 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
  UCD66959  Scutellaria tuberosa Ellen Dean; Davis Botanical Society 2008-5-31 5003 Colusa west of I-5 at Maxwell, east slope of Goat Mountain, along Goat Mountain Road. 1152 Comment
  CAS-BOT-BC417046  Sedella pentandra Herbert L. Mason 1953-5-4 s.n. Colusa Little Stony Creek road 0.25 miles above junction of Little Stony Creek and Trout Creek,Inner North Coast Ranges 609 Comment
  RSA114112  Sedella pentandra H. L. Mason 1953-5-4 s.n. Colusa Little Stony Creek Road 0.25 miles above junction of Little Stony Creek and Trout Creek, Inner North Coast Ranges. 610 Comment
  UCD21584  Senecio flaccidus var. douglasii Craig D. Thomsen 2002-11-7 s. n. Colusa N. of Wilbur Hot Springs between Hot Springs gate and hotel. Confluence of Bear and Sulfur Creeks. Comment
  CDA11923  Senecio greenei G. F. Hrusa 1989-5-7 6078 Colusa North Coast Biodiversity Arena; N side of Little Stony Creek, approx. 3.7 miles upstream from intersection of Cedar Mtn. Rd. and Stonyford-Lodoga Rd. Comment
  JEPS110106  Senecio sylvaticus Lowell Ahart 2006-8-9 13158 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  CHSC6689  Senecio vulgaris Marilyn Lee 1968-3-30 119 Colusa North side of Hwy. 16 at junction of Hwy. 16 and Hwy. 20. Between Hwy. 16 and Cache Creek. Comment
  UCR206873  Senecio vulgaris George K. Helmkamp, E. A. Helmkamp 2009-1-31 14316 Colusa Sacramento Valley, along River Road, 0.9 mile north of the city of Colusa 17 Comment
  SEINET3876301 Image available Sequoia sempervirens James H. Smith 1976-1 s.n. Colusa Williams.; 0 Comment
  UC727668  Setaria pumila Milo S. Baker 1946-9-4 11602 Colusa West Gridley Rd. Butte Sink Comment
  HSC48139  Sidalcea calycosa subsp. calycosa Thomas W. Nelson, Jane Nelson 1978-4-29 3951 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 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
  UCD57860  Sidalcea diploscypha Gordon Harrington 2007-4-17 28 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
  JEPS116995  Sidalcea diploscypha David Gowen 2008-5-24 919 Colusa Bear Valley Road about 5.4 miles north of Hwy 20. 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
  POM174579  Silene californica Roxana S. Ferris 1926-4-23 6444 Colusa Near top of Grapevine Grade on Stonyford-Sites Road. Comment
  RSA477841  Silene californica D. A. Young 1969-5-4 P- 377 Colusa Approx. 10 mi W. of Wilbur Springs along Hwy 16. 610 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
  JEPS86785  Silene campanulata subsp. campanulata Craig D. Thompson 1989-6-3 1564 Colusa ca 1/2 mi e Cook Springs; e of Cook Springs Comment
  HSC62780  Silene campanulata subsp. glandulosa Thomas Wood 1979-4-14 108 Colusa 1067 Comment
  HSC48194  Silene gallica Thomas W. Nelson, Jane P. Nelson 1978-4-29 3962 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  UCR37946  Silene gallica Brian Kearney, Mike Malamus, Peter Williams 1984-4-29 10 Colusa Bear Valley Road, 2 mi. north of Hwy 20. 366 Comment
  CAS-BOT-BC388980  Silene laciniata subsp. californica Lewis S. Rose 1936-4-27 36179 Colusa 11 mi. NW. of Rumsey 304 Comment
  CAS-BOT-BC388982  Silene laciniata subsp. californica Lewis S. Rose 1936-4-27 36179 Colusa 11 mi. NW. of Rumsey 304 Comment
  JEPS124241  Silene laciniata subsp. californica Lowell Ahart 2015-4-1 19992 Colusa Inner North Coast Range. 1/2 mile east of Lake County Line, 12 miles (air) east-northeast of Clear Lake (town), 17 miles (air) west of Williams. Comment
  SEINET8879658  Silene laciniata subsp. californica R. R. Halse 2014-3-25 9036 Colusa Along the Bear Valley Road, ca 1.8 miles WNW of its junction with State Hwy 20. 378 Comment
  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
  CAS-BOT-BC389256  Silene lemmonii Volney Rattan 1884-6-1 s.n. Colusa Summit above Fouts Sp. Coast Mts. North of San Francisco Bay Comment
  CHSC32220  Silene verecunda James Jokerst 1980-8-6 1053 Colusa North Coast Ranges. Near Snow Mountain (west). Ridge top. Comment
  SD22372  Silybum marianum Richard Neil 1938-6-20 Colusa Grimes 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
  HSC72140  Sinapis arvensis J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9572 Colusa Bear Valley Rd., 2.1 mi. from its junction with Hwy. 20 366 Comment
  RSA783303  Sinapis arvensis R. R. Halse 2010-3-20 7826 Colusa Along State Hwy 20 ca. 5.4 miles W of Colusa (junction of State Hwys 20 & 45). 17 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
  HSC72145  Sisymbrium altissimum J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9558 Colusa Bear Valley Rd., 2.1 mi. from its junction with Hwy. 20 366 Comment
  UCD81234  Sisymbrium irio Ellen Dean; K. Mawdsley and B. Rice 2009-5-6 5571 Colusa Payne Ranch, lands to the SW of the jct. of Hwys. 16 and 20. Along Bear Creek south of Brophy Canyon, near old access road that leaves Hwy. 16 near milepost 6. 218 Comment
  CAS-BOT-BC75280  Sisymbrium officinale Roxana S. Ferris 1926-4-21 6272 Colusa On Sycamore Slough 2 miles west of Sycamore. Comment
  UC10834  Sisymbrium officinale J. Burtt Davy May 1898 4273 Colusa near Willows 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
  JEPS120994  Sisyrinchium bellum Lowell Ahart 2013-4-26 18644 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
  POM163504  Sisyrinchium bellum Roxana S. Ferris 1926-4-21 6307 Colusa Near Sycamore Comment
  HSC59568  Sisyrinchium bellum Rick Lundquist 1979-4-14 22 Colusa Bear Valley Rd., 13 mi. N of Hwy. 20 396 Comment
  UCD15596  Sisyrinchium bellum Lisa Montany 1985-4-13 10 Colusa Bear Valley, 8.6 miles north of Wilbur Springs Rd and Hwy 20 intersection. 390 Comment
  JEPS80059  Smilacina racemosa L. R. Heckard with J. Hickman 1979-6-15 5059 Colusa saddle trail between east peak and west peak Snow Mt 2103 Comment
  SEINET3887835  Smilacina racemosa var. amplexicaulis Barbara Bogert 1970-5-23 16 Colusa Bear Valley Road 2.5 miles north of State Highway 20.; 0 183 Comment
  JEPS120808  Solanum americanum Lowell Ahart 2013-10-1 19082 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
  UCR201554  Solanum americanum George K. Helmkamp, E. A. Helmkamp 2008-10-14 14256 Colusa Sacramento Valley, along CA-20, 0.2 mile east of the Sutter County line 9 Comment
  NY821006  Solanum nodiflorum R. J. Stinchfield 1916-7-7 385 Colusa Stinchfield Ranch. Sycamore Slough bed Comment
  HSC41467  Solanum parishii Richard Runyon 1977-4-24 35 Colusa Along Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  HSC42017  Solanum parishii M. A. Baker 1977-4-24 222 Colusa Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  HSC66005  Solanum parishii Teri Bartowski, Shane Feusier, Ruth Takaki, Carol Zimmerer 1980-4-19 40 Colusa 5.4 mi. from Lodoga along little Stony Creek at Digger Pine Campground 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
  UCD57832  Solanum parishii Gordon Harrington; Diana Hickson, Jack Alderson 2007-4-29 38 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Along Thompson Creek, upstream (going roughly west) from Road Kill Cafe, about 1/2 mile upstream from the breached dam. 398 Comment
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May 13 2013
  CDA6240  Solanum pseudocapsicum M. H. Handley 1961-7-24 Colusa 0 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
  UCD82441  Solidago velutina subsp. californica Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5668 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
  UC1613356  Soliva sessilis Charles M. Belshaw Apr 1937 2873 Colusa vicinity Cook's Spring; Inner North Coast Range, Devil's Ridge Comment
  UCR238926  Sonchus oleraceus George K. Helmkamp, E. A. Helmkamp 2012-2-9 18531 Colusa Sacramento Valley, River Road, 7.1 miles north of Colusa; east side of Sacramento River 18 Comment
  CDA32941  Sonchus oleraceus Doug Barbe & Phyllis Hiatt 1979-5-2 Colusa Williams; waste ground by Shell station. 0 Comment
  CAS-BOT-BC235306  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
  UC1100454  Sorghum halepense Herbert L. Mason 1945-9-10 12723 Colusa 1 mi. n. Colusa (below causeway over Butte Sink spillway, e. bank Sacramento R.); Sacramento R. Comment
  CHSC29847  Spergularia macrotheca var. leucantha K. R. Stern 1980-6-30 6658 Colusa Vernal pool area, south border Colusa National Wildlife Refuge. 45 Comment
  UC8724  Spergularia macrotheca var. leucantha J. Burtt Davy May, 1898 4272 Colusa near Willows; near Willows Comment
  CAS-BOT-BC390767  Spergularia marina G. B. Rossbach; R. P. Rossbach 1938-5-31 632 Colusa 3 mi. e. of Williams Comment
  CAS-BOT-BC390768  Spergularia marina G. B. Rossbach; R. P. Rossbach 1938-5-31 639 Colusa 6 mi. west of Colusa Comment
  CDA32689  Sporobolus cryptandrus Howard Johnson 1958-12-14 Colusa Arbuckle, Howard Johnson Property, Route 1, Box 91 0 Comment
  CDA41022  Stachys ajugoides var. ajugoides D. Brown 1972-6-16 s.n. Colusa Geo. Lodi Prop., Grimes. 0 Comment
  JEPS75731  Stachys ajugoides var. rigida L. R. Heckard 1974-9-9 3869 Colusa se Foutch Camp (just ne of rocky promontory); Snow Mt. 1798 Comment
  CHSC88559  Stachys albens L. P. Janeway 2001-6-6 7116 Colusa Inner North Coast Ranges. Malaney Flat, about 4.8 km (air) east of Walker Ridge Road. Large open meadow. 610 Comment
  RSA0118630  Stachys albens Lowell A. Ahart 2013-10-1 19079 Colusa Strand of East Park Reservoir, about 2.5 miles (air) southeast of Stonyford, about 2.5 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 365 Comment
  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
  CDA16112  Stachys rigida G. F. Hrusa, Dmitri Geltman (LE) 1999-8-18 15241 Colusa North Coast Ranges; Leesville Rd. On E side of main ridge from Bear Valley. 213 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
  UCD66928  Stachys stricta Craig D. Thomsen; G. Harrington 2008-7-6 2772 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
  SEINET10836144  Stapfia colusana Davy 1898-5-26 DAVY s.n. Colusa Near Princeton, on road to Norman Comment
  CAS-BOT-BC374775  Stebbinsoseris heterocarpa Roxana S. Ferris 1917-4-14 570 Colusa 7 mi west of Arbuckle, Arbuckle - Rumsey Road Comment
  JEPS80121  Stellaria calycantha L. R. Heckard with J. Hickman 1980-7-1 5277 Colusa ca 10 mi w Stonyford (Snow Mt., cirque between East and West Peaks); Snow Mt. 2042 Comment
  UCR212364  Stellaria media Craig D. Thomsen 2000-3-31 2074 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mi west of Hwy 20/16 intersection, milepost 3.00 310 Comment
  CHSC62930  Stellaria nitens Vernon H. Oswald; Lowell Ahart 1994-4-6 6072 Colusa Goat Mtn. Rd. 0.8 mi S of Sullivan Creek Bridge, SW of Digger Pine Flat, S of Stonyford. On the edge of the road. 487 Comment
  UCD164038  Stellaria nitens Amber Flores 2016-4-9 4 Colusa BLM Bear Creek Ranch (previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. On lower slopes of hill just south of corral at 16 and 20. 343 Comment
  UCD65628  Stellaria nitens Craig D. Thomsen 2000-4-12 2128 -b Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  UCD63014  Stellaria pallida Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4666 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. South of corral on west side of Bear Creek, just south of Hwy 20. 321 Comment
  CHSC79473  Stephanomeria virgata subsp. pleurocarpa G. F. Hrusa 1998-10-28 14899 Colusa Inner North Coast Ranges. Slope along Cedar Camp Rd. as it enters Little Stony Ck. Cyn., approx. 1 mi. from Lodoga/Stonyford Rd. 400 Comment
  CDA15504  Streptanthus breweri G. F. Hrusa, WTD 1998-6-19 14642 Colusa North Coast Ranges; Above Fouts Springs (overlooking settlement) on Trough Ridge Rd. to Stonyford. Comment
  CHSC107538  Streptanthus breweri G. F. Hrusa 1998-6-19 14600 Colusa North Coast Ranges. Roadcut above Little Stony Creek. Goat Mtn. Rd. ~ 1 km. W of intersection with Lodoga-Stonyford Rd. 415 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
  UC1492724  Streptanthus breweri Freed W. Hoffman 1957-6-26 4264 Colusa 6 mi w Stonyford 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
  UCD110407  Streptanthus breweri Daniel Slakey; CNPS volunteers 2011-6-12 3 Colusa Walker Ridge. Brim Rd., 1/4 mile E of Walker Ridge Rd. Population extends about 1 mile farther east. 647 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
  UCD164316  Streptanthus breweri Ryan O'Dell 2010-7-1 s.n. Colusa UTM zone 10, 545440 4334598. [UTM coordinates place this location on east side of Walker Ridge along Bartlett Springs Road.] Comment
  HSC62796  Streptanthus breweri M. A. Ericksen 1979-4-14 207 Colusa Adjacent to Bear Valley Rd., 3.9 mi. from Hwy. 20 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
  UCD58119  Streptanthus breweri var. breweri Ellen Dean; PLB 102 Class 2007-4-29 3714 Colusa Payne Ranch. West of Hwy. 16. Ca. 2 road miles S of junction of Hwy. 20 and Hwy. 16. Craig Canyon. Along unimproved road. 328 Comment
  CHSC40533  Streptanthus glandulosus Jordan Detzer 1977-4-16 19 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 10 mi wsw of Williams. 143 Comment