Search Results — 2000 specimen records retrieved (1643 records with coordinates)
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 Please cite data retrieved from this page: Data provided by the participants of the Consortium of California Herbaria (ucjeps.berkeley.edu/cch_archive/).
 Records are made available under the CCH Data Use Terms.

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? Specimen ID Determination * Collector Collection Date Collection Number County Locality Elevation in meters Feedback
  HSC5007  Abies concolor J. O. Sawyer 1968-10-12 756 Colusa Colusa/Lake Co. line, Snow Mtn., boundary N of Clear Lake and W of Stony Ford 2134 Comment
  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
  UCD80834  Acer macrophyllum Ellen Dean; G. Harrington, J. Alderson, M. Bibbo, B. Rice 2009-3-25 5291 Colusa BLM Bear Creek (Payne) Ranch, lands to the SW of the jct of Hwys 16 and 20. Canyon to the north of Brophy Canyon. 239 Comment
  CAS-BOT-BC334177  Acer negundo var. californicum Roxana S. Ferris 1917-4-17 618 Colusa Sycamore Slough Comment
  CAS-BOT-BC21712  Achillea millefolium J. Clausen 1939-6-26 1743 Colusa 17 miles west of Williams, just before entering Lake County Comment
  UCD57663  Achillea millefolium Erica A. Smith; with Plant Biology 102 2007-4-29 1 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central/Eastern part of ranch. Craig Canyon. Along unimproved road. 313 Comment
  JEPS75040  Achnatherum lemmonii L. R. Heckard 1972-7-10 3135 Colusa w of Trout Creek; Snow Mt., Trout Creek 1828 Comment
  SEINET223541 Image available Achnatherum lemmonii L. R. Heckard 1972-7-10 3135 Colusa West of Trout Creek Snow Mt. 1829 Comment
  CHSC81215  Achyrachaena mollis Caroline Warren; Jenny Marr, Heidi West, Joyce Lacey-Rickert, Julie 1998-4-14 Colusa Vicinity of Grapevine Creek and Sites-Lodoga Road. 137 Comment
  POM52917  Achyrachaena mollis Roxana S. Ferris 1917-4-12 s.n. Colusa 4 miles east of Williams. 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
  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
  UCD56907  Achyrachaena mollis Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3510 Colusa BLM Payne Ranch. In Craig Canyon. Southwest of intersection of Hwy. 16 and Hwy. 20. 326 Comment
  UCD64421  Achyrachaena mollis Craig D. Thomsen 2000-4-28 2177 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
  HSC92505  Achyrachaena mollis S. Bowie, J. Lopez & D. Riess 1994-4-23 96 Colusa Bear Valley, 2.1 km south from Brimm Rd. and Walker Ridge Rd. jct. on Brimm Rd. 421 Comment
  UCD55456  Acmispon americanus var. americanus Ellen Dean; Gordon Harrington 2006-10-6 3280 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 374 Comment
  CAS-BOT-BC479712  Acmispon brachycarpus Ann Howald 2003-6-9 2367 Colusa Inner North Coast Ranges: Indian Valley, east side of East Park Reservoir, c. 3 mi N of Lodoga, N of Last Chance camping area 378 Comment
  UCSB63635  Acmispon brachycarpus Fukuyama, S. 1986-4-5 Colusa Ca 0.3 mi w of jjct of Hwys 20 & 16, S side of Bear Creek, ca 18 mi SW of Williams 321 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
  UCD72387  Acmispon glaber Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5113 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. 550 Comment
  OBI59416  Acmispon grandiflorus var. grandiflorus L. R. Heckard 1969-5-28 2233 Colusa On rd above and W of Fouts Springs 762 Comment
  SBBG100086  Acmispon grandiflorus var. grandiflorus L. R. Heckard 1969-5-29 2240 Colusa Trough Spring Ridge Rd, 0.2 mi N of its jct with Crackerbox Ridge Rd, ca. 6.5 air mi SE of Stonyford 1127 Comment
  SD247416  Acmispon rubriflorus Ann Howald 2003-6-9 2362 A Colusa Inner North Coast Ranges: Indian Valley, east side of East Park Reservoir, c. 3 miles north of Lodoga, near Rocky Ridge camping area (Lodoga 7.5'Q) 423 Comment
  CHSC27824  Acmispon wrangelianus Catherine Corr 1978-4-8 17 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. 143 Comment
  HSC44246  Acmispon wrangelianus Barbara Kelly 1977-4-24 351 Colusa Along Walker Ridge Rd. above Barrel Springs Campground. 701 Comment
  CAS-BOT-BC107  Adenostegia palmata Roxana Judkins [later Mrs. Ferris q.v.] Stinchfield 1916-6-17 284 Colusa near College City 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
  UC71996  Adenostoma fasciculatum Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  UCD84556  Adenostoma fasciculatum Ellen Dean; C. Thomsen, G. Harrington, Davis Botanical Society 2010-6-5 6081 Colusa Walker Ridge. Along Walker Ridge Road on southern part of the ridge, south of turnoff to Indian Valley Reservoir. 683 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
  CDA1644  Aegilops cylindrica C. Thomsen 1988-5-25 1537 Colusa Indian Creek Drainage, Arrowhead Ranch, Cooks Springs Road, Ladoga. 0 Comment
  CDA4021  Aeschynomene rudis June McCaskill, J. Hill 1990-8-27 s.n. Colusa Near Princeton. 0 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
  CDA4028  Aeschynomene rudis G. D. Barbe, Daryl Brown 1990-8-29 4392 Colusa West side of Boggs Road between Dodge and Fonseca Roads; 5.6 km southwest of Princeton. 0 Comment
  CDA4030  Aeschynomene rudis G. D. Barbe, June McCaskill 1990-9-5 4397 Colusa West side of Boggs Road between Dodge and Fonseca Roads; 5.6 km southwest of Princeton. 0 Comment
  UCD14573  Aeschynomene rudis June McCaskill; with Jim Hill 1990-8-27 s.n. Colusa Colusa Co.; near Princeton in a rice field; 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
  UCD104592  Aeschynomene rudis June McCaskill; G. D. Barbe 1990-9-5 4397 Colusa West side of Boggs Road Between Dodge and Fonseca roads; 5.6 km southwest of Princeton. Comment
  UCD104593  Aeschynomene rudis June McCaskill; G. D. Barbe 1990-9-5 4397 Colusa West side of Boggs Road Between Dodge and Fonseca roads; 5.6 km southwest of Princeton. Comment
  HSC59124  Aesculus californica Terry Roth 1979-5-7 40 Colusa Where Hwy. 20 enters Salt Canyon along Salt Creek 122 Comment
  UCD57716  Agoseris grandiflora Jordan Thompson; with Plant Biology 102 2007-4-29 1 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central/Eastern part of ranch. Craig Canyon. North side of Craig Creek on south side of unimproved road. 335 Comment
  CHSC56746  Agoseris heterophylla Joel Hoskins 1989-4-1 2 Colusa Ca. 0.3 mi W of jct of Hwys 20 and 16, S side of Bear Creek, ca. 18 mi SW of Williams. 321 Comment
  CHSC90228  Agoseris heterophylla Michelle L. Bell 1989-4-1 13 Colusa Ca. 0.3 mi w of jct of Hwys 20 and 16, ca. 18 mi sw of Williams, s side of Bear Creek. 321 Comment
  HSC72163  Agoseris heterophylla J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9538 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  UCD162984  Agoseris heterophylla Craig D. Thomsen 2002-4-4 2582 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
  UCD66469  Agoseris heterophylla Craig D. Thomsen 2001-4-12 2459 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  JEPS36239  Agoseris heterophylla var. cryptopleura W. L. Jepson 1932-5-8 16286 Colusa w Colusa Co Stonyford Comment
  UCSC010468  Agoseris heterophylla var. cryptopleura Dylan M. Neubauer, Tim Forsell 2016-3-31 595 Colusa (NCoRI) Walker Ridge, Walker Ridge Road, 1.78 air-miles sse Cold Spring Mountain 815 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
  JEPS80443  Agrostis exarata L. R. Heckard and J. C. Hickman 1980-9-15 5420 Colusa w of Summit Springs; Snow Mt. 1554 Comment
  RSA724965  Agrostis exarata L. Ahart 2006-8-9 13167 Colusa North side and just east of the bridge across Stony Creek, just north of Stonyford 348 Comment
  CHSC94280  Agrostis viridis Lowell Ahart 2006-8-9 13111 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  CHSC91020  Aira caryophyllea D. Isle 2002-4-18 298 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. N of Chlorinator bldg., Rd. to Bathhouse Trail. 548 Comment
  UCD66472  Aira caryophyllea Craig D. Thomsen 2001-4-24 2476 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  UCR227338  Aira caryophyllea Craig D. Thomsen 2001-4-24 2476 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, south side of Hwy 20, c. 0.25 mi west of Hwy 20/16 intersection, near Colusa Co. milepost 3.0 310 Comment
  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
  CAS-BOT-BC459584  Allium amplectens James Jokerst 1985-4-4 2199 Colusa Wilbur Springs Quad., Near Rail Canyon Comment
  CHSC84321  Allium amplectens Lowell Ahart 2003-7-14 10380 Colusa Along a small drainage, field on the south side of Highway 20, about 2 miles southwest of the intersection of Highway 20 and Bear Valley Road, about 21 miles (by road) southwest of Williams. 520 Comment
  JEPS73487  Allium amplectens L. R. Heckard 1972-7-9 3099 Colusa se slope of East Peak of Snow Mt. East Peak of Snow Mt. 2072 Comment
  POM174568  Allium amplectens Roxana S. Ferris 1926-4-23 6578 Colusa Stonyford. Comment
  UC1299746  Allium amplectens Freed W. Hoffman 1948-6-27 2514 Colusa 8.6 mi sw Fouts Spring; North Coast Ranges, Upper Letts Valley Comment
  UCR261630  Allium amplectens Ann Howald 2003-3-26 2291 A Colusa Inner North Coast Ranges, Indian Valley, East Park Reservoir, Catholic Point peninsula, near Coppermine Road, c. 0.2 mi northwest of intersection with East Ruby King Road 417 Comment
  UCD138461  Allium cratericola Louis K. Mann 1961-3-19 s.n. Colusa Bear Valley. 396 Comment
  UCD141837  Allium cratericola L. K. Mann; M. D. Mann 1961-4-2 s.n. Colusa Bear Valley. 396 Comment
  CDA15775  Allium falcifolium G. F. Hrusa 1993-5-2 10852 Colusa North Coast Ranges; Frenzel Creek Research Natural Area - Mendocino National Forest. Lower Frenzel Creek, tributary of Little Stony Creek. Comment
  CHSC71009  Allium falcifolium Vernon Oswald; Lowell Ahart 1998-5-7 9009 Colusa Bartlett Springs Rd. 2.8 mi west of Bear Valley Rd., 0.1 mi east of Sawtelle Valley and Grapevine Flat roads. 633 Comment
  JEPS73488  Allium falcifolium L. R. Heckard 1972-7-9 3100 Colusa se slope of East Peak of Snow Mt. East Peak of Snow Mt. 2011 Comment
  UCD141854  Allium falcifolium Roman Gankin 1958-4-25 s.n. Colusa 4 miles west of Leesville. Near head of Bear Valley. 304 Comment
  CAS-BOT-BC135887  Allium fimbriatum subsp. purdyi Peter H. Raven 1962-5-31 17908 Colusa State Highway 20, 2.5 miles east of Lake County line. Comment
  CAS-BOT-BC135888  Allium fimbriatum subsp. purdyi David D. Keck 1933-5-30 2398 Colusa Colusa-Lake County line west of Wilbur Springs. Comment
  CHSC32948  Allium fimbriatum var. purdyi Thomas Nelson; Jane Nelson 1978-4-29 3928 Colusa Along Bear Valley Rd. ca. 2 miles from junction with State Route 20. 365 Comment
  HSC42391  Allium fimbriatum var. purdyi Dale McNeal 1977-5-18 2028 Colusa Beside Hwy. 20, 0.9 mi. W of the junction with Hwy. 16 Comment
  HSC47987  Allium fimbriatum var. purdyi Thomas W. Nelson, Jane P. Nelson 1978-4-30 3972 Colusa Along Hwy. 20, E of Colusa-Lake county line 549 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
  UCD66711  Allium fimbriatum var. purdyi Craig D. Thomsen 2001-5-24 2536 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
  UCD66911  Allium fimbriatum var. purdyi Craig D. Thomsen 2008-4-27 s.n. Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Slopes to the northwest of Eula Canyon and WNW of Cowboy Camp on the west side of Bear Creek. 451 Comment
  RSA31856  Allium fimbriatum var. purdyi A. A. Heller 1937-06 s.n. Colusa Lake Landing Comment
  SBBG128800  Allium fimbriatum var. purdyi L. Ahart, J. Dittes, J. Guardino 2013-4-26 18641 Colusa rocky serpentine outcrop on N side of St Hwy 20, just E of Lake County Line, 12.2 mi (air) ENE of Clear Lake (town), 17.1 mi (air) W of Williams 566 Comment
  CDA11415  Allium serra G. F. Hrusa, K. van Katwyk 1995-4-22 12136 Colusa Inner North Coast Ranges; S side of Leesville Rd. approx. 3 m. N of Hwy 20. Comment
  CHSC71010  Allium serra Vernon Oswald; Lowell Ahart 1998-5-7 8992 Colusa Lodoga-Leesville Rd. 4.3 mi south of Cooks Springs Rd. 469 Comment
  CHSC86119  Allium serra Jenny Marr; Caroline Warren 1998-5-4 Colusa Vicinity of Sites, Stone Corral Creek, and Antelope Valley. 106 Comment
  HSC72137  Allium serra J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9569 Colusa Bear Valley Rd., 2.1 mi. from its junction with Hwy. 20 366 Comment
  CAS-BOT-BC475546  Allium serra A. A. Heller 1919-5-10 13112 Colusa Grade east of Leesville in the oak belt on open grassy slopes. 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
  POM269061  Allium serra Lyman Benson 1933-4-16 4327 Colusa 5 miles east of Lake County line. Mt. Range: Inner N. Coast; Watershed: N. Fork Cache Creek. 457 Comment
  SEINET3879172  Allium serra D. W. McNeal, David Isle 1991-5-22 3821 Colusa On a steep road bank above Hwy #162, 4.3 mi E of the Stony Creek Bridge N of Elk Creek.; 0 Comment
  UCD138639  Allium serra C. B. Shah 1960-4-10 11 Colusa Bear Valley, 10 miles northwest of junction of State Highways 16 and 20. 304 Comment
  UCD141825  Allium serra M. Yamaguchi; D. Hughes, D. G. Hunt 1965-4-29 s.n. Colusa 6.6 miles south of Lodoga on Leesville-Lodoga Road, on right side of road. Comment
  UCD15285  Allium serra Claire Warshaw 1985-4-13 9 Colusa along Bear Valley Road, 8 miles northwest from intersection with highway 20; 390 Comment
  CHSC90778  Allophyllum divaricatum D. Isle 2002-4-18 182 Colusa Mendocino National Forest--North Coast Ranges. Upper Lake Watershed. S. of Bathhouse Trail Rd. 17N51, no. of Fouts Springs. 548 Comment
  UC1051499  Allophyllum divaricatum Helen K. Sharsmith 1953-6-19 4280 Colusa 1 mi. n. Trough Springs (on Trough Springs Ridge); Inner N. Coast Ranges, Mendocino Nat'l Forest, Trough Spring 914 Comment
  CHSC62939  Allophyllum gilioides subsp. violaceum Vernon H. Oswald; Lowell Ahart 1994-4-6 6060 Colusa Goat Mtn. Rd. at Sullivan Creek, 1.2 mi SW of Digger Pine Flat, S of Stonyford. On slopes bordering Sullivan Creek. 469 Comment
  CHSC88518  Allophyllum gilioides subsp. violaceum B. Castro 2003-5-15 1438 Colusa Vicinity of Logan Ridge, Sulphur Gap and Lurline Creek. On steep SE-facing slope in opening above dirt rd paralleling a S-trending canyon. 195 Comment
  RSA783325  Allophyllum gilioides subsp. violaceum R. R. Halse 2010-3-25 7849 Colusa Along State Hwy 20 ca. 10.7 miles SW of its junction with Interstate Hwy 5 at Williams. In Salt Canyon. 154 Comment
  SEINET14407744  Allophyllum gilioides subsp. violaceum R. R. Halse 2010-3-25 7849 Colusa Along State Hwy 20 in Salt Canyon, ca 10.7 miles SW of its junction with I-5 at Williams. 154 Comment
  SEINET3872990  Allophyllum gilioides subsp. violaceum Richard R. Halse 2010-3-25 7849 Colusa Along State Hwy. 20 ca 10.7 miles southwest of its junction with Interstate Hwy. 5 at Williams; in Salt Canyon.; 0 154 Comment
  SEINET10510969  Alopecurus californicus Roxana S. Ferris 1917-4-12 Ferris 549 Colusa 4 miles E of Williams. Alkali Plains. Comment
  UCD55944  Alopecurus saccatus A. A. Beetle 1942-5-21 3276 Colusa 12 miles north of Williams. Comment
  UCR201546  Amaranthus blitoides George K. Helmkamp, E. A. Helmkamp 2008-10-14 14264 Colusa Sacramento Valley, along River Road (generally following the Sacramento River), 8.4 miles north of Colusa 17 Comment
  UC727678  Amaranthus californicus Milo S. Baker 1946-9-5 11625 b Colusa 5 mi w Colusa (along hwy towards Williams) Comment
  CDA19687  Ambrosia confertiflora D. Brown 2001-10-17 PDR 024367 Colusa Northern California; Vicinity of Colusa 0 Comment
  CHSC94986  Ambrosia psilostachya Lowell Ahart 2006-10-31 13518 Colusa About 20 yards northeast of the bridge across Stony Creek, just north of Stonyford. 347 Comment
  SEINET8237697  Ammannia coccinea John Thomas Howell 1944-7-18 19837 Colusa 3 miles west of Williams. Comment
  CHSC94478  Ammannia robusta Lowell Ahart 2006-8-9 13142 Colusa North side and just east of the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS110091  Ammannia robusta Lowell Ahart 2006-8-9 13142 Colusa North side and just east of the bridge across Stony Creek, just north of Stonyford 347 Comment
  UC71657  Amsinckia Miss Alice King 1905-1 Colusa College City Comment
  SEINET7096533  Amsinckia intermedia Richard R. Halse 2001-3-22 5944 Colusa Williams; along a vacant lot by 455 - 4th street. 39 9.52 N 122 8.84W (Converted to decimal degrees). Elevation 18 m. 18 Comment
  UC1093628  Amsinckia intermedia Francia Chisaki, Gene B. Newcomb 1958-4-1 1100 Colusa on road to Lodoga (6.6 mi n of junction with Hwy 20) Comment
  UC1093629  Amsinckia intermedia Francia Chisaki, Gene B. Newcomb 1958-4-1 1102 Colusa on road to Lodoga (6.6 mi n of junction with Hwy 20) Comment
  UC71658 Image available Amsinckia intermedia Miss Alice King 1905-1 Colusa College City; ; College City, Colusa Co. Comment
  UCD80900  Amsinckia intermedia Ellen Dean; w/ Destanella Flat Tour 2009-3-28 5300 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
  HSC31598  Amsinckia intermedia Thomas E. Higley 1974-5-5 84 Colusa 0.5 mi. S of N Fork Campground 412 Comment
  UCD119708  Amsinckia intermedia David West 1960-4-10 11 Colusa Southern end of Bear Valley, 5 miles northwest of junction of State Highway 16 and 20. 243 Comment
  UCD80820  Amsinckia lunaris Ellen Dean, G. Harrington; K. Mawdsley, C. Thomsen, G. Walden, E. McDermott 2009-3-18 5276 Colusa BLM Bear Creek (Payne) Ranch, lands to the SW of the jct of Hwys 20 and 16. SW-facing slope above Lynch Canyon on east side of canyon. 517 Comment
  UCD80821  Amsinckia lunaris Ellen Dean, G. Harrington; K. Mawdsley, C. Thomsen, G. Walden, E. McDermott 2009-3-18 5277 Colusa BLM Bear Creek (Payne) Ranch, lands to the SW of the jct of Hwys 20 and 16. SW-facing slope above Lynch Canyon on east side of canyon. 470 Comment
  UC1084529  Amsinckia lycopsoides Peter Kamb 1952-5-25 2291 Colusa 1 mi e Lake County line (on Hwy 20) Comment
  CHSC89871  Amsinckia menziesii B. Castro; S. Innecken 2001-3-26 1219 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, 85 Comment
  UCD163216  Amsinckia menziesii Craig D. Thomsen 2000-4-28 2193 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 0.3 mile west of Hwy 20/16 intersection. 345 Comment
  UCR233359  Amsinckia menziesii var. menziesii George K. Helmkamp, E. A. Helmkamp 2011-4-1 17116 Colusa Western Sacramento Valley, along Maxwell Road, 2.1 miles east of Maxwell, near Delevan Wildlife Refuge 23 Comment
  SEINET7075569  Ancistrocarphus filagineus A. G. Vestal 1955-4-5 s.n. Colusa In mountains [Cortina Ridge] west of Williams on Route 20 at Salt Canyon. 39? deg. 6' 22" North Latitude, -122? deg. 19' 15" West Longitude. UTM Zone 10, 558719mE, 4328566mN. (NAD 27)]. [Coordinate Datum: WGS84/NAD83]. Comment
  UC1111603  Ancistrocarphus filagineus Herbert L. Mason 1941-4-5 12406 Colusa 3 mi s Stonyford 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
  CHSC81290  Androsace elongata subsp. acuta L. P. Janeway; B. Castro 2001-4-19 7025 Colusa Vicinity of Grapevine Creek, Sites-Lodoga Road, and Scotties Spring. 280 Comment
  JEPS75850  Anisocarpus scabridus L. R. Heckard 1974-9-10 3900 Colusa se slope East Peak Snow Mt. 2103 Comment
  SD22373  Anthemis cotula Richard Neil 1938-6-20 Colusa Grimes Comment
  UC726114  Antirrhinum subcordatum A. A. Heller 1940-6-7 15717 Colusa ridge e Lodogo Comment
  JEPS121750  Antirrhinum subcordatum David Isle, Ronda Isle 2013-5-19 2039 Colusa COLUSA County, CA. 01 mi E of Maxwell Grade Summit; burned SW asp. upper drainage slope N of Sites Lodoga Road. Comment
  CHSC110424  Antirrhinum vexillo-calyculatum subsp. breweri David Isle; Rhonda Isle 2012-6-14 1945 Colusa About 2 mi SE of Stonyford; E AspSlope about 250 yds N of E. Park res. S Dam and 100 ft W of shoreline, N of large cusped conglomerate rock with small caves. 390 Comment
  CHSC84191  Antirrhinum vexillo-calyculatum subsp. intermedium Lowell Ahart 2003-7-14 10388 Colusa By a wash, on the east side of Bear Valley Road, about 3 miles northwest of Highway 20. 381 Comment
  UCD70222  Antirrhinum vexillocalyculatum D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. 370 Comment
  JEPS15536  Antirrhinum vexillocalyculatum subsp. breweri G. Thomas Robbins with L. R. Heckard 1956-7-25 3694 Colusa about 1.5 air mi se Snow Mt. summit (on ridge above Fouts Camp and along trail to Snow Mt, on Lake-Colusa County boundary) 1920 Comment
  UCD123477  Antirrhinum virga A. M. Shapiro 1994-6-13 s.n. Colusa just north of Goat Mountain Rd. on Sullivan Ridge. 914 Comment
  CHSC101627  Apiastrum angustifolium David W. Isle 2002-4-18 1656 Colusa Mendocino National Forest; N of Fouts Springs, n of Chlorinator Building on road to Bathhouse Trail (Snow Mtn.) N aspect of E drainage in chamise site burned during 8/8/01 Trough Fire and part of Hydromulch Soil Erosion Study Plot. 524 Comment
  CHSC111647  Apocynum cannabinum David Isle 1988-5-11 2102 Colusa Mendocino National Forest - North Coast Ranges Middle Fork Stony Creek Watershed. Above (S of) 18N01 (M10), ~200 yds NW of jct w/ OHV Trail 17N12; (3/4 mi SW of Fouts Springs Loop Rd, E Side). 670 Comment
  CHSC48685  Aquilegia eximia Vernon Oswald 1984-7-20 1625 Colusa M10, 5.4 mi w of Rd. 306 at Stonyford. 609 Comment
  CAS-BOT-BC392020  Aquilegia eximia G. L. Stebbins 1972-6-25 9000 Colusa Ravine below Black Diamond Glade, 4 miles northwest of Stonyford 411 Comment
  JEPS80851  Arabis eschscholtziana L. R. Heckard and J. C. Hickman 1980-7-3 5370 A Colusa sw slope Snow Mt.; , Summit Springs 1554 Comment
  JEPS75709  Aralia californica Alice Q. Howard 1972-7-10 13 Colusa Paradise Creek at crossing of trail between Fouts Camp and Box Springs; Snow Mt. 1371 Comment
  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
  CDA34806  Arctostaphylos canescens subsp. sonomensis Peter Warner 2010-5-16 153 Colusa Walker Ridge Road, ~18.4 km N of jct. with Hwy. 20, along E (Colusa Co.) side of road, on slopes above Zimory Canyon to the west, Trout Creek to the east, and adjacent slopes on both sides of the road. Comment
  CAS-BOT-BC240291  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
  CDA12247  Arctostaphylos manzanita G. F. Hrusa 1989-2-7 5807 Colusa Inner North Coast Ranges; Road to Cedar Mtn, along Little Stony Creek approx. 3 miles above junction with Stonyford-Lodoga Rd. Comment
  SD53207  Arctostaphylos manzanita Darley F. Howe 1962-5-19 3285 Colusa 11 miles west of Williams on Highway 20. 149 Comment
  UCR206665  Arctostaphylos manzanita subsp. manzanita George K. Helmkamp, E. A. Helmkamp 2009-3-17 14395 Colusa Inner North Coast Ranges Foothills, along CA-16 and Bear Creek, 7.0 miles south of the junction with CA-20; just north of the Yolo County line 194 Comment
  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
  JEPS87758  Arctostaphylos viscida subsp. pulchella Vernon H. Oswald and Lowell Ahart 1994-3-23 6011 Colusa s side Little Stony Creek (in section on e side of Frenzel Creek, s of Stonyford); Frenzel Creek Research Natural Area 518 Comment
  UCD81854  Arctostaphylos viscida subsp. pulchella Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5738 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
  UC1053477  Argemone rotundata Rimo Bacigalupi, Arthur Holmgren 1950-4-26 3178 Colusa just w of base of the grade to Indian Valley (Bartlett Mountain Road), just w of Bear Valley, Inner North Coast Ranges Indian Valley; Inner North Coast Ranges Comment
  CHSC87131  Aristida ternipes var. hamulosa B. Castro; Michelle Cedarborg 2003-5-6 1427 Colusa Vicinity of Logan Ridge, Sites Peak and Lurline Creek. 219 Comment
  CAS-BOT-BC400398  Aristolochia californica Roxana Stinchfield 1916-7-8 377 Colusa Sycamore Slough, Stinchfield Ranch Comment
  JEPS104400  Artemisia douglasiana Lowell Ahart 2003-10-23 10660 Colusa Along Squaw Creek, just south of East Park Reservoir, ca 1/8 mi nw of Sites Lodoga Rd, ca 1 mi n of Lodoga, ca 21 mi w of Maxwell. 368 Comment
  JEPS110139  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
  UCD84440  Asclepias eriocarpa Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6050 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
  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
  CAS-BOT-BC222853  Asclepias solanoana G. L. Stebbins 1966-6-6 6432 Colusa Lovelady Ridge, south of South Fork, Stony Creek, 6.5 miles south of Stony ford [Stonyford] 609 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
  JEPS95651  Asclepias speciosa Vernon H. Oswald and L. Ahart 1999-6-18 9774 Colusa Fouts Springs Rd. (M10) 9.9 mi west of Stonyford-Elk Creek Rd.: T17N R7W Sect. 7, 2050 ft, chaparral, serpentine substrate. From a colony growing along the edge of a roadside seep. 624 Comment
  JEPS73499  Aspidotis densa L. R. Heckard 1972-7-10 3117 Colusa trail e of Foutch Camp Snow Mt (near Trout Creek) 1828 Comment
  UCD104677  Astragalus clevelandii K. Esau; D. Hartmann 1941-7-17 s.n. Colusa Between Williams and Clear Lake, U.S. #20. Comment
  UCD163230  Astragalus clevelandii Craig D. Thomsen 2001-5-24 2535 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 1 mile west of Hwy 20/16 intersection. 345 Comment
  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
  UC638665  Astragalus gambelianus Ethel Crum 1938-5-7 2017 Colusa 4.2 mi n Rumsey (Inner North Coast Range, summit of ridge); Inner North Coast Range, summit of ridge, n of Rumsey 254 Comment
  UC83408  Astragalus gambelianus Katharine Brandegee april 1889 Colusa Colusa Junction Comment
  UCD63028  Astragalus gambelianus Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4680 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. 510 Comment
  HSC47646  Astragalus gambelianus J. P. Smith, J. O. Sawyer 1978-4-29 9790 Colusa Just W of Walker Ridge Rd. intersection with Bartlett Springs Rd. Comment
  UCD104819  Astragalus gambelianus J. M. Tucker 1958-3-7 3363 Colusa State Highway 16, Cache Creek Canyon, 0.1 mile north of Yolo-Colusa County line. Comment
  CHSC26263  Astragalus rattanii var. jepsonianus J. D. Jokerst 1977-4-16 62 Colusa S side of Bear Creek, Hwy. 20, ca. 18 mi sw of Williams, .3 mi w of jct. Hwys. 20 and 16. 321 Comment
  HSC48165  Astragalus rattanii var. jepsonianus Thomas W. Nelson, Jane P. Nelson 1978-4-29 3929 Colusa Along Bear Valley Rd. 2 mi. from junction with State Route 20 366 Comment
  JEPS21844  Astragalus rattanii var. jepsonianus John R. Swanson 1958-4-26 280 Colusa along roadside on Bear Valley - Lodoga road 6.6 mi s Barlett Springs junction; Bear Valley - Lodoga Road 365 Comment
  RSA424724  Astragalus rattanii var. jepsonianus Aaron Liston, M. Blumler 1987-4-26 667 -3 Colusa Bear Valley - Lodoga Road, 6.6 miles S of Bartlett Springs Jct. Comment
  RSA515105  Astragalus rattanii var. jepsonianus Aaron Liston, Sara Meury 1989-4-13 709 -3 Colusa 2.8 miles NE of Middletown. Hwy 29 300 Comment
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Aug 20 2014
  UC1613418  Astragalus rattanii var. jepsonianus Charles M. Belshaw 1937-4-25 2830 Colusa Cooks Spring, Devils Ridge Inner Coast Range, Cooks Spring, Devils Ridge Comment
  UC2029550  Astragalus rattanii var. jepsonianus Richard R. Halse 2013-3-27 8764 Colusa Along State Highway 20 just east of the Colusa/Lake County Line, ca. 14.6 miles east of the junction of State Highway 20 and 53 Comment
  UCD105314  Astragalus rattanii var. jepsonianus J. M. Tucker; Dorothy Dreyfus 1967-4-29 4034 Colusa Bear Valley, 9 miles north of junction of Bear Valley Road with State Highway 20. 403 Comment
  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
  UCD163326  Astragalus rattanii var. jepsonianus Craig D. Thomsen 2009-5-3 2791 Colusa Walker Ridge. Vicinity of Walker Ridge Rd., 0.25 miles north of Hwy 20. Comment
  UCD56661  Astragalus rattanii var. jepsonianus Sam Bledsoe 2007-3-25 3 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
  UCD63037  Astragalus rattanii var. jepsonianus Ellen Dean; Marjorie Phan and Gerald Dickinson 2008-4-27 4883 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Along unnamed tributary of Bear Creek. 322 Comment
  UCR212305  Astragalus rattanii var. jepsonianus Craig D. Thomsen 2000-5-11 2291 B 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
  NY5728  Astragalus tener var. ferrisiae R. S. Ferris 1926-4-21 6281 Colusa 3 Mi W of Colusa. Comment
  RSA0003126  Astragalus tener var. ferrisiae Roxana S. Ferris 1926-4-21 6281 Colusa 3 mi W of Colusa.. Comment
  CAS-BOT-BC17401  Athysanus pusillus Roxana S. Ferris 1917-4-14 551 Colusa Foothills 7 miles west of Arbuckle. Arbuckle-Rumsey Road. Comment
  JEPS80394  Athysanus pusillus L. R. Heckard and J. Hickman 1981-6-22 5627 Colusa below (south of) Dark Hollow Trail (Snow Mountain); Snow Mountain 1981 Comment
  SEINET11193155  Athysanus pusillus R. R. Halse 2013-3-27 8763 Colusa Along Hwy 20 just E of the Colusa/Lake County line, ca 14.6 miles E of the junction of Hwy 20 and Hwy 53. 558 Comment
  SEINET5586423  Athysanus pusillus Richard R. Halse 2013-1 8763 Colusa Along State Hwy. 20 just eat of the Colusa/Lake County Line, ca. 14.6 miles east of the junction of State Hwy. 20 and 53 558 Comment
  UCD114233  Athysanus pusillus Beecher Crampton 1958-4-21 4725 Colusa Colusa-Yolo County line, along State Hwy. 16, junction Bear and Cache Creeks, 7.4 miles northwest of Rumsey. Comment
  UCD165928  Athysanus pusillus Ellen Dean; with T. Starbuck and D. McNair 2016-4-9 8833 Colusa BLM Bear Creek Ranch (formerly Payne Ranch). Southwest of intersection of Highway 20 and Highway 16. Near corral at Highway 20. 479 Comment
  UCSC010467  Athysanus pusillus Dylan M. Neubauer, Tim Forsell 2016-3-31 596 Colusa (NCoRI) Walker Ridge, Walker Ridge Road, 1.78 air-miles sse Cold Spring Mountain 815 Comment
  JEPS59519  Atriplex argentea var. mohavensis W. L. Jepson 1929-9-26 15274 Colusa Maxwell 25 Comment
  CHSC61030  Atriplex coronata var. coronata Vernon H. Oswald; Mike Wolder, Joe Silveira. 1993-7-26 5701 Colusa Colusa National Wildlife Refuge. Tract 18 on the S side of the refuge, ca. 1 mi W of Ohm Rd., ca. 1 mi N of Ware Rd., ca. 5 mi S of Colusa. 15 Comment
  CHSC107968  Atriplex depressa B. Castro; Amy Lyons 2011-8-3 1900 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; approximately I mi southeast of Funks Reservoir and 800 ft northeast of Tehama-Colusa Canal. At SW end of N-trending swale, off northwest corner of large +- alkaline marsh. 49 Comment
  CHSC60279  Atriplex depressa K. R. Stern 1980-6-30 6654 Colusa Vernal Pool, south central border area of Colusa National Wildlife Refuge. 45 Comment
  CHSC61039  Atriplex depressa Vernon H. Oswald; Mike Wolder, Joe Silveira 1993-7-26 5703 Colusa Colusa National Wildlife Refuge. W side of Pool 3 on the S end of the refuge near Ohm Rd., ca. 2 mi N of Ware Rd., ca. 5 mi S of Colusa. 15 Comment
  UC40790  Atriplex semibaccata J. Burtt Davy May 1898 4287 Colusa Maxwell Comment
  UC72556  Atriplex serenana var. serenana H. P. Chandler 1905-9-14 Colusa Princeton Comment
  UCD56224  Avena barbata Beecher Crampton 1958-4-21 4727 Colusa Colusa-Yolo Co. line: 7.4 miles northwest of Rumsey. Along State Hwy. 16. Junction Bear and Cache Creeks. 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
  UCD56362  Avena fatua Beecher Crampton 1962-4-17 6213 Colusa Sycamore. Comment
  UCD82112  Avena fatua Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5640 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 839 Comment
  CHSC98782  Baccharis salicifolia Richard R. Halse 2007-3-25 7134 Colusa Along State Hwy. 20 ca. 7.8 miles northeast of its junction with State Hwy. 16, at base of Salt Canyon. Along Salt Creek. 100 Comment
  UC1585403  Balsamorhiza macrolepis R. Raiche 1989-5-23 90133 Colusa w of, n of Wilber Springs, se end of Walker Ridge, Sulpher Creek Drainage Williams; Sulpher Creek Drainage 610 Comment
  UCD82586  Barbarea vulgaris Craig D. Thomsen; J. Wiegand, S. Harrison, G. Harrington, A. Fulks 2008-4-22 2731 Colusa Walker Ridge. Eaton Springs, 4 mi N of Hwy 20, ca. 1 mi E of Walker Ridge Rd. 609 Comment
  CDA2974  Bassia hyssopifolia Margaret Bellue Oct 1932 Colusa Near Williams. 0 Comment
  CDA396  Bassia hyssopifolia L. Ahart 2003-8-15 10509 Colusa On the south side oof Highway 20, about 1 mile southwest of Williams. Comment
  UC1191425  Bassia hyssopifolia Herbert L. Mason 1946-8-6 12958 Colusa pond on Colusa-Marysville Highway four mi s Colusa (w side of Sacramento River); w side of Sacramento River Comment
  UCD38965  Bassia hyssopifolia Beecher Crampton 1961-7-20 5934 Colusa 4 miles SE of Grimes, along Knight's Landing Road. Comment
  POM312364  Bassia hyssopifolia H. L. Mason 1946-8-6 12958 Colusa Pond on Colusa-Marysville Hwy, 4 miles S of Colusa, west side of Sacramento River. Comment
  UCD97576  Bassia hyssopifolia Herbert L. Mason 1946-8-6 12958 Colusa On Colusa-Marysville Highway, four miles south of Colusa, west side of Sacramento River. Comment
  CHSC85963  Bellardia trixago Jenny Marr; Heidi West, Joyce Lacey-Rickert, Caroline Warren 1998-5-8 Colusa Vicinity of Sites and Antelope Valley. 137 Comment
  CHSC84963  Bergia texana Lowell Ahart 2003-10-23 10670 Colusa On the east strand of East Park Reservoir, about 1/8 mile northwest of Sites Lodoga Road, about 1 mile north of Lodoga, about 21 miles west of Maxwell. 368 Comment
  JEPS104404  Bergia texana Lowell Ahart 2003-10-23 10670 Colusa On the e strand of East Park Reservoir, ca 1/8 mi nw of Sites Lodoga Rd, ca 1 mi n of Lodoga, ca 21 mi w of Maxwell. 368 Comment
  UCR71523  Bergia texana Barbara Ertter, Et al. 1989-10-21 8869 Colusa SE end of East Park Reservoir north of Lodoga 366 Comment
  UC1192266  Bergia texana Herbert L. Mason, Verne Grant 1946-8-6 12967 Colusa Pond 2.7 miles north of Colusa between Sacramento River and Butte Creek Comment
  CHSC42573  Berula erecta Vernon Oswald 1986-6-30 2171 Colusa Fouts Spring Rd. (M10) at Candy Bucket Spring, 6.0 mi w of Rd. 306. 0.4 mi e of jct. John Smith Rd. (M5). 609 Comment
  JEPS18813  Blennosperma nanum var. nanum Ruth Johnson 1915-4-6 Colusa College City Comment
  JEPS73482  Boechera breweri subsp. breweri L. R. Heckard 1972-7-9 3093 Colusa se slope East Peak; Snow Mt. 2072 Comment
  JEPS80111  Boechera platysperma L. R. Heckard with J. Hickman 1980-7-1 5270 Colusa ca 10 mi w Stonyford (cirque between West and East Peaks; Colusa-Lake County line); Snow Mt. 1950 Comment
  JEPS127625  Boehmeria cylindrica B. Castro with Tom Boullion 2009-9-29 1800 G-2 Colusa Ca 8 ai mi SE of Colusa, via Buster Rd off Hwy 45, just W of Ogden Bend on W bank of the Sacramento River at RM 130.8. Comment
  RSA724954  Boisduvalia densiflora var. densiflora L. Ahart 2006-8-9 13140 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
  CHSC101402  Bolboschoenus glaucus David Isle 2006-5-16 1573 Colusa From bank of irrigation canal west of Maxwell cardlock gas station (south end of Maxwell just W of Hwy 99W). On east edge of canal at west end of Jack Barrett's 4th rice check (counting from N to S). 30 Comment
  CHSC101411  Bolboschoenus glaucus David Isle 2007-5-1 1574 Colusa SE of Maxwell about 4 miles in riparian natural area just west of irrigation canal and 'Lakeland' rice fields farmed by William Dirks and Jack Barrett. (Across footbridge S of third Landing curve.) 30 Comment
  CHSC80474  Bolboschoenus glaucus Caroline Warren; Jenny Marr, Heidi West, Natalie Wight 1998-6-11 Colusa Vicinity of Funks Creek and Logan Ridge. 106 Comment
  CHSC84931  Bolboschoenus glaucus Lowell Ahart 2003-10-23 10672 Colusa Along Squaw Creek, just south of East Park Reservoir, about 1/8 mile northwest of Sites Lodoga Road, about 1 mile north of Lodoga, about 21 miles west of Maxwell. 368 Comment
  JEPS101904  Bolboschoenus glaucus Dean W. Taylor 1989-8-4 10420 Colusa Colusa National Wildlife Refuge, along Ohm Road 39 Comment
  UCD72536  Bolboschoenus maritimus Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3827 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. West side of Bear Creek, ca. 0.25 mile downstream of bridge. 251 Comment
  CAS-BOT-BC31370  Bolboschoenus maritimus Roxana S. Ferris 1926-4-22 6283 Colusa Roadside ditch 3 miles west of Colusa. Comment
  JEPS80460  Botrychium crenulatum Alice Q. Howard 1972-7-10 2 Colusa mossy spring area crossing trail from Fouts Camp to Box Springs (highest of 2 such areas on n side of ridge separating Trout and Paradise Creeks); Snow Mt. 1676 Comment
  CAS-BOT-BC106348  Brickellia californica A. J. Bassinger 1927-10-29 s.n. Colusa Sand Creek, Coast Range 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
  RSA718047  Brickellia californica L. Ahart 2006-8-9 13110 Colusa On the south side of Stony Creek, at Mine Camp, about 3.5 miles (air) west of stonyford. 422 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
  RSA724892  Bromus arenarius L. Ahart 2006-8-22 13216 Colusa south side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford. 349 Comment
  UCD57610  Bromus arenarius Beecher Crampton 1958-5-19 4793 Colusa 10.1 miles southeast of Leesville. 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
  UCD81887  Bromus carinatus Ellen Dean; Bear Creek Ranch Grazing Committee 2009-6-19 5771 Colusa BLM Bear Creek (formerly Payne) Ranch. Lands to the SW of the junction of Hwys 16 and 20. Southern portion of Lynch Canyon, just S of building known as Roadkill Cafe. Along Thompson Creek, E of road crossing. 423 Comment
  CAS-BOT-BC155997  Bromus diandrus Roxana S. Ferris 1926-4-21 6277 Colusa Sycamore Slough 2 miles from Sycamore. Comment
  UCD83625  Bromus diandrus Adam Clause; with PLB 102 class 2010-5-2 4 Colusa Walker Ridge. Eaton Springs. 20 meters south of the main road, on the flat valley floor. 709 Comment
  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
  JEPS80197  Bromus hordeaceus L. R. Heckard and J. Hickman 1980-7-3 5351 Colusa 10 mi w of Stonyford (just w of Summit Springs, sw of Snow Mountain) 1548 Comment
  UCD58684  Bromus hordeaceus A. A. Beetle 1942-5-21 3272 Colusa 12 miles north of Williams. Comment
  UCD58711  Bromus hordeaceus Beecher Crampton 1962-4-17 6222 Colusa 3.3 miles north of College City. Comment
  UCR228650  Bromus japonicus Ellen Dean, Gordon Harrington, Craig D. Thomsen, S. Harrison 2008-5-18 4934 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 20 348 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
  HSC31698  Bromus laevipes Thomas E. Higley 1974-5-4 63 Colusa 3/4 mi. N of T junction of Indian Valley. 854 Comment
  JEPS80797  Bromus laevipes L. R. Heckard and J. C. Hickman 1981-7-30 5767 Colusa se side of Snow Mountain, along Trout Creek Trout Creek; Snow Mountain, Trout Creek 1554 Comment
  UC1055952  Bromus laevipes Helen K. Sharsmith 1953-6-19 4266 Colusa near confluence of North and Middle forks of Stoney Creek (Red Bridge Camp, Mendocino National Forest); Inner North Coast Ranges, Mendocino National Forest, Red Bri 548 Comment
  UCD163860  Bromus laevipes Craig D. Thomsen 2001-5-31 2542 Colusa Bear Creek Canyon south of Sulphur Creek confluence. About 3 miles north of Hwy 20. Comment
  UCD57485  Bromus laevipes Helen K. Sharsmith 1953-6-19 4266 Colusa Inner north coast ranges. Mendocino National Forest. Red Bridge Camp. Near confluence of North and Middle forks of Stoney Creek. 548 Comment
  CHSC112028  Bromus laevipes David Isle; Doug Johnson 1988-5-11 2089 Colusa Mendocino National Forest. Little Stony Road (Goat Mtn Rd). 426 Comment
  CDA16100  Bromus madritensis subsp. rubens G. F. Hrusa 1999-5-16 15043 Colusa North Coast Ranges; Slopes above Fouts Springs, on serpentine, immediately below Verbena spring. Few on roadside, scattered here, dominant in a few sites. Annual. 594 Comment
  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
  CHSC94853  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
  JEPS80193  Bromus tectorum L. R. Heckard and J. Hickman 1980-7-3 5346 Colusa 10 mi w of Stonyford (just w of Summit Springs, sw Snow Mountain); Snow Mountain 1548 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
  UC1563672  Cacaliopsis nardosmia Barbara Ertter 1989-7-1 8595 Colusa road to Goat Mt. Lookout 2.2 mi s Rt. M-10 (Bear Creek-Fouts Spring Rd) (at head of creek, ca 12 airmiles wsw of Stonyford); S Fork Stony Creek 1500 Comment
  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
  SBBG128801  Calandrinia breweri L. Ahart 2013-5-1 18673 Colusa N sie of St Hwy 20, just E of Lake County Line, 12.2 mi (air) ENE of Clear Lake (town), 17.1 mi (air) W of Williams 566 Comment
  HSC72159  Calandrinia ciliata J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9534 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  UCD163689  Calandrinia ciliata Craig Thomsen 1999-4-15 1991 Colusa Bear Valley. About 5 miles north of Hwy 20, west of Bear Valley Rd. Comment
  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
  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
  UCD159532  Calendula officinalis D. S. Park 2011-4-11 280 Colusa Disturbed agricultural field off Boles Rd. Comment
  UCD57052  California macrophylla Gordon Harrington; Diana Hickson 2007-4-7 0011 Colusa BLM Payne Ranch, SW of intersection of Hwy 16 and Hwy 20, 3/4 mile west of Roadkill Cafe. Comment
  NY465060  Callitriche marginata A. A. Heller 1902-5-2 5440 Colusa Princeton Comment
  UC1049549  Calochortus amabilis Rimo Bacigalupi 1950-4-16 3110 Colusa e outskirts Stony Ford (town) (vicinity of Colusa-Glenn County line); Inner North Coast Ranges Comment
  UC843630  Calochortus amabilis Lewis S. Rose 1936-4-27 36196 Colusa 22 mi sw Williams 396 Comment
  UCD56677  Calochortus amabilis Jack Alderson 2007-3-25 13 Colusa BLM Payne Ranch. Destinella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 570 Comment
  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
  UCD63617  Calochortus amabilis Craig D. Thomsen 1999-5-12 2030 Colusa BLM Payne Ranch. Approximately 0.5 mile southwest of intersection of Hwy 16 and Hwy 20. On large knoll. Comment
  CHSC85971  Calochortus luteus Jenny Marr; Heidi West, Joyce Lacey-Rickert, Caroline Warren 1998-5-8 Colusa Vicinity of Sites and Antelope Valley. 152 Comment
  JEPS122381  Calochortus luteus Nisrine Machaka-Houri with Gracie Benson-Martin 2014-5-3 NG 1 Colusa Bear Valley Road 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
  CAS-BOT-BC491929  Calochortus luteus J. Clausen 1935-5-20 1011 Colusa 18 miles west of Williams on Bartlett Springs road Comment
  HSC103563  Calochortus luteus J. Carey, A. Hong, J. Leffingwell 1995-5-7 88 Colusa 2.25 mi. SE on Leesville-Williams Rd. from its junction with Bear Valley Rd. 396 Comment
  UCD139535  Calochortus luteus Grady L. Webster 1977-5-15 7679 Colusa Bear Creek, ca. 0.5 mile west of junction of Wilbur Springs Road and Rtw. 20. 350 Comment
  CAS-BOT-BC483486  Calochortus splendens Greg de Nevers; S. Charnley 1995-5-27 10735 Colusa Snow Mountain 914 Comment
  CHSC28483  Calochortus splendens Timothy Spira; Robert Schlising 1978-5-13 3247 Colusa Ca. 0.5 mi NW jct Hwy 20 and Bear Valley (=Wilber Springs) Road, along latter. Comment
  UCD63117  Calochortus splendens Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4948 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. 401 Comment
  UC1051720  Calochortus splendens Helen K. Sharsmith 1953-6-19 4276 Colusa e slope Snow Mountain (on Bonny Doon road); Inner North Coast Ranges, Mendocino National Forest 670 Comment
  UC1187346  Calochortus splendens Herbert L. Mason 1961-5-21 15075 Colusa Mouth of Bear Valley Comment
  UC1051690  Calochortus tolmiei Helen K. Sharsmith 1953-6-19 4289 Colusa Old Mill Campground, Trough Springs Ridge Inner North Coast Ranges, Mendocino National Forest 1219 Comment
  CHSC53987  Calochortus uniflorus Vernon H. Oswald 1991-4-21 4523 Colusa Bear Valley Rd in Bear Valley, 4.6 mi south of Brim Rd (Bartlett Springs Rd), west of Williams. 417 Comment
  HSC83384  Calochortus uniflorus Bob Wych 1975-4-20 16 Colusa 8.7 mi. N of Hwy. 20 on Wilbur Springs Rd. 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
  HSC94037  Calycadenia pauciflora G. Fred Hrusa 1998-6-19 14595 Colusa Along Little Stony Creek, on Goat Mtn. Rd., ~0.5 km W of intersection with Lodoga-Stonyford Rd. 400 Comment
  UCD146725  Calycadenia pauciflora G. F. Hrusa 1998-6-19 14595 Colusa Inner North Coast Ranges. Along Little Stony Creek, on Goat Mountain Road. Around 1/2 km west of intersection with Lodoga-Stonford Road. 400 Comment
  UCD61447  Calycadenia pauciflora Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3892 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1500 ft NW of parking lot. 368 Comment
  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
  CAS-BOT-BC270742  Calycadenia pauciflora Gerald D. Carr 1972-8-2 723 Colusa 0.6 mile W of Leesville - Lodoga Road on road to Cook's Springs Comment
  CAS-BOT-BC270747  Calycadenia pauciflora Gerald D. Carr 1971-7-29 606 Colusa On road to Trout Creek Trail, 0.5 mile NW of driveway to Fout Springs Boy's Ranch 502 Comment
  CAS-BOT-BC270753  Calycadenia pauciflora Gerald D. Carr 1971-9-14 651 Colusa 2.0 miles SW of Leesville on road to Bartlett Spring Comment
  CAS-BOT-BC270815  Calycadenia pauciflora A. A. Heller 1919-6-8 13239 Colusa Near Lodoga Comment
  RSA255608  Calycadenia pauciflora Gerald D. Carr 1971-7-29 605 Colusa 1.7 miles west of Lodoga on road to Stoneyford 412 Comment
  RSA255612  Calycadenia pauciflora Gerald D. Carr 1971-7-29 606 Colusa On road to Trout Creek Trail, 0.5 miles NW of driveway to Fout Spr. Boy's Ranch 503 Comment
  RSA255613  Calycadenia pauciflora Gerald D. Carr 1971-9-14 652 Colusa 3.6 miles southwest of Leesville on Bartlett Spr. Road 518 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
  UC1971691  Calycadenia pauciflora 1978-8-20 2156 Colusa Bear Valley Road, 0.1 mi N of jct with Brim Road (to Bartlett Springs), ca. 2 mi SW of Leesville (=GDC 651) 482 Comment
  UCD129807  Calycadenia pauciflora Gerald D. Carr 1971-7-29 608 Colusa 1 miles south of Stoneyford on road to Lodoga. 365 Comment
  UCD129891  Calycadenia pauciflora Gerald D. Carr 1971-9-14 651 Colusa 2.0 miles southwest o Leesville on road to Bartlett Springs. Comment
  UCD129895  Calycadenia pauciflora Gerald D. Carr 1971-9-15 658 Colusa 6.0 miles north of Yolo County line Hwy 16. Comment
  UCD82572  Calycanthus occidentalis Craig Thomsen 2008-6-12 2763 Colusa Walker Ridge, Elgin Mine area. Comment
  UCR228284  Calycanthus occidentalis Ellen Dean, Gordon Harrington, Craig D. Thomsen, S. Harrison 2008-5-18 4955 Colusa Payne Ranch, owned by BLM, lands to the southwest of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20 437 Comment
  UC1299369  Calyptridium monospermum Freed W. Hoffman 1948-6-26 2512 Colusa western Goat Mountain Goat Mountain Comment
  UCD100385  Calyptridium monospermum M. Vincent 1968-6-6 780 Colusa Goat Mt. Road. 1 mile from Stanford turnoff. Comment
  IRVC29689  Calyptridium umbellatum Mark A. Elvin, Mark S. Brunell, David Isle 2006-8-3 5029 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
  UCD57819  Calystegia collina Gordon Harrington 2007-4-17 31 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Destanella Flat, just south of Hwy 20, approximately 3.4 road miles west of the Hwy 16 intersection. 527 Comment
  CDA39872  Calystegia collina T. C. Fuller 1958-5-27 3670 Colusa South of Highway 20, 1 mile west of junction with Highway 16. 0 Comment
  HSC41916  Calystegia collina subsp. collina M. A. Baker 1977-4-24 225 Colusa Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  UCD66710  Calystegia collina subsp. oxyphylla Craig D. Thomsen 2001-5-24 2533 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UCD164158  Calystegia subacaulis Craig Thomsen 2000-4-28 2266 Colusa Between Bear Creek and Bear Valley Rd. about 0.3 mile north of junction with Hwy 20. Comment
  RSA261450  Camassia leichtlinii subsp. suksdorfii J. M. Tucker, L. K. Mann 1959-5-30 3531 Colusa Small lake in Mill Valley, ca. 1/4 mile northwest of Lower Letts Valley, and ca. 4 miles, airline, north of Goat Mountain Lookout 1220 Comment
  POM271975  Camissonia graciliflora Lyman Benson 1935-3-27 6328 Colusa 8 miles E of Lake County line, inner N coast mt. range, Sacramento River watershed 305 Comment
  CDA15476  Camissoniopsis hirtella G. F. Hrusa, WTD 1998-6-19 14613 Colusa North Coast Ranges; Above upper Little Stony Creek. Goat Mtn. Rd. ~ 1.5 km. W of of campground. Comment
  UCD66822  Campanula griffinii D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley, Destanella Flat-Walker Ridge. 450 Comment
  JEPS80789  Campanula prenanthoides L. R. Heckard and J. C. Hickman 1981-7-30 5762 Colusa se side Snow Mt.; Trout Creek 1569 Comment
  JEPS80202  Capsella bursa-pastoris L. R. Heckard and J. Hickman 1980-7-3 5357 Colusa 10 mi w of Stonyford (around Summit Springs, sw flank of Snow Mountain); Snow Mountain 1548 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
  CHSC78603  Carduus pycnocephalus J. Marr; C. Warren, J. Michaels 1998-5-4 Colusa Vicinity of Sites, Logan Ridge and Golden Gate. 76 Comment
  JEPS120997  Carduus pycnocephalus subsp. pycnocephalus Lowell Ahart 2013-5-1 18660 Colusa Bear Valley Road, about 2.5 road miles NW of intersection of Hwy 20 and Bear Valley Road. Comment
  CHSC94984  Carex amplifolia Lowell Ahart 2006-10-31 13536 Colusa Big Springs, on the south side of Letts Lake, about 13 miles (air) southwest of Stonyford. 1529 Comment
  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
  CHSC92598  Carex bolanderi D. Isle 2005-7-14 1145 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. In first perennial drainage west of junction 17N09 diagonal 17N10 about 40 yards above culvert crossing 17N09. Waypoint BDCMP 1: NAD27 10S 0523113E 4350662N. Comment
  JEPS80864  Carex bolanderi L. R. Heckard and J. C. Hickman 1981-7-30 5754 Colusa Trout creek, SE side of Snow Mountain 1615 Comment
  SEINET7556704 Image available Carex densa Lowell Ahart 2006-8-22 13213 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  CDA15482  Carex feta G. F. Hrusa, T. D. Wilfred 1998-6-19 14619 Colusa North Coast Ranges; Wet area on spring in +- shaded understory of Pinus ponderosa, Abies concolor forest along Goat Mtn. Rd. below intersection with USFS Pacific Ridge Rd. (M5). Short-rhizomatous perennial. Comment
  RSA523879  Carex fracta Barbara Ertter 1989-7-1 8610 Colusa Road to Goat Mountain Lookout 1.7 miles S of Rt. M-10 (Bear Creek-Fouts Spring Road) at head of S Fork Stony Creek, ca. 12 airmiles WSW of Stonyford. 1463 Comment
  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
  CAS-BOT-BC35776  Carex jonesii L. R. Heckard 1974-9-10 3913 Colusa Snow Mt.;northeast slope of West Peak 2072 Comment
  SEINET7563262 Image available Carex klamathensis Unknown 1999-7-5 6497 Colusa At Bear Wallow Spring, on north side of Lovelady Ridge about 0.5 mi northeast of Pacific Point. Hough Springs quad. 1045 Comment
  CAS-BOT-BC31226  Carex lenticularis var. impressa L. R. Heckard 1972-7-8 3059 Colusa Upper reaches of Dark Hollow Creek in saddle between East and West Peaks of Snow Mt. 1981 Comment
  JEPS83819  Carex lenticularis var. impressa L. R. Heckard and J. Hickman 1980-9-16 5461 Colusa cirque area between peaks, ne slope of West Peak, Snow Mt. West Peak; Snow Mt., West Peak 2011 Comment
  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
  UCD84435  Carex nudata Jack Alderson 2009-4-8 31 Colusa BLM Bear Creek Ranch (Previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. Brophy Canyon. 304 Comment
  CAS-BOT-BC119425  Carex obnupta Roxana S. Ferris 1917-4-15 607 Colusa Sycamore Slough. Comment
  JEPS75136  Carex pachystachya L. R. Heckard 1972-7-8 3040 b Colusa n side of ridge running se Snow Mt., West Peak 2011 Comment
  UC1748289  Carex praegracilis L. P. Janeway and B. Castro 1999-7-5 6499 Colusa 0.5 mi NE of Pacific Point ( at Bear Wallow Spring, on N side of Lovelady Ridge) 1045 Comment
  UCD163204  Carex praegracilis Craig D. Thomsen 2000-3-31 2069 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
  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
  UCD82623  Carex praegracilis Craig Thomsen; G. Harrington 2009-5-12 2893 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 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
  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
  UCD83799  Carex serratodens Craig Thomsen; G. Harrington 2009-5-14 2903 Colusa Colusa County on Walker Ridge: about 200 yds. south of spur road, 1/2 mile east of Walker Ridge Road, en route to Eaton Springs. 813 Comment
  HSC36255  Carex serratodens Steven Lagos 1974-5-4 48 Colusa 915 Comment
  JEPS83817  Carex subfusca L. R. Heckard 1972-7-8 3040 a Colusa on n side of ridge running se West Peak; Snow Mt. 2011 Comment
  CHSC82975  Carex tumulicola Barbara Wilson; R. Brainerd, L. Janeway, D. Isle, M. Mooers 2002-6-28 10705 Colusa High North Coast Ranges. Near Ellen Spring; north side of Road 24N02 0.2 km south of junction with Goat Mountain Road. At base of road fill. 1052 Comment
  HSC45686  Castilleja applegatei Patricia Shesgreen 1978-4-22 38 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  UC2014139  Castilleja applegatei Ellen Dean, C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6046 Colusa Colusa County. Walker Ridge. Along Walker Ridge Road, N of turnoff to Indian Valley Reservoir but S of Til Jones Spring. Many old undeveloped roads here. Comment
  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
  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
  CHSC81306  Castilleja applegatei subsp. martinii J. Trizzino 2001-3-31 12 Colusa Bear Valley Road about 2 mi from southern entrance to valley along west side of road. 408 Comment
  HSC44462  Castilleja applegatei subsp. martinii R. York, Advanced Plant Taxonomy Lab 1978-4-22 131 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  CHSC86031  Castilleja attenuata Jenny Marr; H. West, J. Lacey, C. Warren, N. Wight 1998-4-14 Colusa Vicinity of Grapevine Creek, Antelope Valley, and Sites-Lodoga Road. 121 Comment
  HSC47735  Castilleja attenuata Thomas W. Nelson, Jane P. Nelson 1978-4-29 3940 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  RSA0011988  Castilleja attenuata George K. Helmkamp, E. A. Helmkamp 2011-4-1 17122 Colusa Antelope Valley, along Maxwell-Sites Road, 1.8 miles southeast of Sites 77 Comment
  UCD64255  Castilleja attenuata Craig D. Thomsen 2000-3-31 2056 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
  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
  CDA32834  Castilleja exserta P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  UCD15433  Castilleja exserta Lisa Montang 1985-4-13 1 Colusa Colusa Co.; 3.8 miles north of Bear Valley Road and Highway 20 intersection; 390 Comment
  UCD82329  Castilleja exserta Robin McMaster 1973-4-15 320 Colusa 10 mi NW of Rumsey. Comment
  JEPS16218  Castilleja exserta subsp. exserta Rimo Bacigalupi and Arthur Holmgren 1950-4-26 3165 Colusa 8 mi nw Maxwell (along road Sites, on extreme w edge of the Sacramento Valley); Sacramento Valley Comment
  UCR47925  Castilleja exserta subsp. exserta Eugene Tanimoto 1975-4-20 13 Colusa Bear Valley Road, 8.7 mi north of State Hwy 20 Comment
  HSC67098  Castilleja exserta subsp. exserta D. Boyd, M. Eichelberger, Tim Messick, T. Ranker 1980-4-19 42 Colusa Along Bartlett Springs Rd., .6 mi. from Jct. with Hwy. 16 Comment
  CHSC110845  Castilleja foliolosa David Isle; Rhonda Isle 1989-4-29 2000 Colusa Stony Creek Watershed. Just N of 18N01 (Fouts Springs Rd.), ~2 miles W of Jct. w/Co. Rd. 306. (Just E of entrance to Brother Moore's Home). 382 Comment
  CHSC114943  Castilleja foliolosa Lowell Ahart 2015-4-10 20014 Colusa On the northside of Brim Road, about 2 miles west of the intersection of Bear Valley Road and Brim Road, about 17 miles (air) west of Williams. Chaparral. 500 Comment
  HSC45672  Castilleja foliolosa Stephen Plant 1978-4-22 207 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  JEPS124244  Castilleja foliolosa Lowell Ahart 2015-4-10 20014 Colusa About 2 miles west of the intersection of Bear Valley Road and Brim Road, about 17 miles (air) west of Williams. Comment
  JEPS8775  Castilleja foliolosa Alice King May 1906 Colusa College City Comment
  RSA589920  Castilleja foliolosa Michael A. Vincent, Robert M. Rhode 1996-3-30 7297 Colusa Along Brim Rd., 1.9 mi. W jct. Bear Valley Rd. Comment
  SEINET14045906  Castilleja foliolosa R. R. Halse 2011-3-25 8160 Colusa Along State Hwy. 20 just E of the Lake County Line, ca 14.6 miles E of its junction with State Hwy 53. 558 Comment
  UCD66943  Castilleja foliolosa Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5092 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western side of ranch along trail that follows the border of Lake and Colusa counties. South of Dunsfield Flat. 647 Comment
  UCR37888  Castilleja foliolosa K. B. Barrows, C. G. Phillips, L. Cole, S. A. Hautain 1984-4-28 25 Colusa Descend into Bear Valley, Brim Rd., 6.0 mi. east of Bartlett Springs Rd 488 Comment
  JEPS80826  Castilleja miniata L. R. Heckard and J. C. Hickman 1981-7-31 5798 Colusa e side Snow Mt. (Dark Hollow Creek); , Dark Hollow Creek 1615 Comment
  JEPS82554  Castilleja miniata L. R. Heckard 1983-7-27 6101 Colusa ca 2 mi w Stonyford road; Little Stony Creek 411 Comment
  CHSC71451  Castilleja minor subsp. spiralis Vernon H. Oswald; Lowell Ahart 1998-7-15 9271 Colusa Bartlett Springs Rd. 1.6 mi west of Bear Valley Rd. 487 Comment
  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
  UCR40060  Castilleja rubicundula subsp. lithospermoides K. B. Barrows, C. G. Phillips, L. Cole, S. A. Haultain 1984-4-28 27 Colusa Bear Valley, Brim Road, 2.9 mi west of Leesvillle-Lodoga Junction 418 Comment
  CHSC56783  Castilleja rubicundula subsp. rubicundula Peggy Brennan 1980-4-19 107 Colusa Ca 0.3 mi west of junction of Hwy 20 and Hwy 16; south side of Bear Creek, ca 18 mi southwest of Williams. 321 Comment
  JEPS44112  Castilleja rubicundula subsp. rubicundula Barrie Stanfield 1966-4-16 27 Colusa 5 mi n Wilbur Springs turnoff (Bear Valley bottomlands); Bear Valley Comment
  JEPS74818  Castilleja rubicundula subsp. rubicundula L. R. Heckard, T. I. Chuang and R. Bacigalupi 1975-5-8 4026 Colusa 6 mi n (by road) Wilbur Springs junction; Bear Valley 365 Comment
  RSA0118613  Castilleja rubicundula subsp. rubicundula Lowell Ahart 2013-5-1 18687 Colusa Inner North Coast Range. North of the wash and State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  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
  UC1745694  Castilleja rubicundula subsp. rubicundula Annetta M. Carter, Sarah Dyal, Ethel Crum 1938-5-8 1389 Colusa S end of lake 0.4 mi. N of Lodoga. Comment
  UC1745724  Castilleja rubicundula subsp. rubicundula Annetta M. Carter, Sarah Dyal, Ethel Crum 1938-5-8 1395 Colusa Bear Creek Canyon, 4.4 mi. SE of Wilbur Springs. Comment
  UCD163871  Castilleja rubicundula subsp. rubicundula Craig D. Thomsen 2000-3-31 2132 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
  UCD57296  Castilleja rubicundula subsp. rubicundula Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3667 Colusa BLM Payne Ranch. Near origin of Craig Canyon. Close to Thompson Canyon. West of Hwy. 16, ca. 2 road miles south of junction of Hwy. 20 and Hwy. 16. 349 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
  CHSC86876  Caulanthus lasiophyllus B. Castro 2003-3-25 1404 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 182 Comment
  RSA0118787  Caulanthus lasiophyllus Lowell A. Ahart 2013-5-1 18681 Colusa 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
  HSC47566  Ceanothus cuneatus J. P. Smith, J. O. Sawyer 1978-4-29 9768 Colusa Walker Ridge Rd. 3.4 mi. from its jct. with Hwy. 20 Comment
  HSC98203  Ceanothus cuneatus Steven Lagos 1974-5-4 50 Colusa 915 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
  UC80064  Ceanothus cuneatus var. cuneatus T. S. Brandegee Apr 1889 701 Colusa Leesville 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
  UCD146602  Ceanothus integerrimus G. F. Hrusa 1998-6-19 14637 Colusa North Coast Ranges. On Trough Ridge Road. (To Fouts Springs, from Pacific Ridge Road.) 1200 Comment
  UCD170264  Ceanothus integerrimus D. O. Burge 2016-11-3 2188 Colusa Walker Ridge, E of Indian Valley Reservoir, roadside on Bartlett Springs Road. 980 Comment
  UCD170330  Ceanothus integerrimus D. O. Burge 2016-11-3 2189 Colusa Walker Ridge, E of Indian Valley Reservoir, roadside on Bartlett Springs Road. 860 Comment
  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
  UCD58112  Ceanothus jepsonii Ellen Dean; G. Harrington and P. McIntyre 2007-3-16 3376 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
  HSC60452  Ceanothus jepsonii var. albiflorus J. P. Smith 1977-4-24 9036 Colusa Along Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  UC1299512  Ceanothus palmeri Freed W. Hoffman 1947-6-19 1655 Colusa Cook's Springs Cook's Springs (western Colusa County) Comment
  CHSC86117  Centaurea melitensis Jenny Marr; Caroline Warren 1998-5-4 Colusa Vicinity of Sites, Stone Corral Creek, and Antelope Valley. 106 Comment
  UC30927  Centaurea melitensis J. Burtt Davy 1898-5-1 4288 Colusa near Princeton Comment
  CHSC94445  Centaurea solstitialis Lowell Ahart 2006-8-9 13148 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  SEINET251844  Centaurea solstitialis L. Shultz, J. Shultz 1986-9-20 10225 Colusa Ca. 10 miles west of Colusa on Highway 20 Comment
  UCD57443  Centaurea solstitialis Gina Darin; with Plant Biology 102 2007-4-29 2 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central part of ranch. Thompson Canyon. Along trail, north side of Thompson Creek. 374 Comment
  CAS-BOT-BC284462  Centaurea solstitialis Roxana Stinchfield 1916-7-12 474 Colusa Street - College City Comment
  JEPS93803  Centaurium trichanthum Vernon H. Oswald and Lowell Ahart 1998-7-15 9267 A Colusa Bartlett Springs Road 1.6 mi w of Bear Valley Road; Bartlett Springs Road 487 Comment
  UC1051723  Centaurium trichanthum Helen K. Sharsmith 1953-6-19 4273 Colusa e slope Snow Mountain (on Bonny Doon road); Inner North Coast Ranges, Mendocino National Forest 670 Comment
  CAS-BOT-BC281221  Centromadia fitchii Volney Rattan 1877-6-26 s.n. Colusa Sulphur Creek 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
  JEPS118719  Centromadia parryi subsp. rudis B. Castro with Amy Lyons 2011-8-3 1903 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley approximately 1 mi southeast of Funks Reservoir and 800 ft northeast of Tehama-Colusa Canal. Sites 7.5' quad. Comment
  UCD77502  Centromadia parryi subsp. rudis Robert E. Preston 1999-9-24 1242 Colusa Antelope Valley, at head of Salt Canyon. 219 Comment
  CAS-BOT-BC279211  Centromadia pungens subsp. pungens R. F. Hoover 1936-5-22 1218 Colusa Williams Comment
  CAS-BOT-BC279207  Centromadia pungens subsp. pungens A. A. Heller 1916-6-9 12391 Colusa Along the state highway near Colusa Comment
  CAS-BOT-BC279208  Centromadia pungens subsp. pungens A. A. Heller 1916-6-9 12391 Colusa Along the state highway near Colusa 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
  CHSC107943  Centromadia pungens subsp. septentrionalis B. Castro; L. Janeway 2011-4-27 1861 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 5 air mi NW of Maxwell, 0.8 mi southeast of Funks Reservoir and 0.2 mi northeast of Tehama-Colusa Canal. At east side of large +- saline/alkaline wetland/ marsh; in vernal depression in compacted E-W road track that goes through marsh. 49 Comment
  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
  CAS-BOT-BC222990  Cephalanthus occidentalis Roxana Stinchfield 1916-7-8 399 Colusa Sycamore Slough, Stinchfield ranch Comment
  SEINET8730526 Image available Cephalanthus occidentalis Unknown 1946-1 7839 Colusa Butte Creek, 1 mile north of Butte Outing Gun Club, near Colusa, Colusa County. 6 Comment
  UC931956  Cephalanthus occidentalis var. californicus Verne Grant and Alva Grant 1946-8-6 7839 Colusa near Colusa (Butte Creek bank, 1 mi n of Butte Outing Gun Club); Butte Creek Comment
  JEPS80442  Cerastium glomeratum L. R. Heckard and J. Hickman 1980-7-3 5372 A Colusa s.w. slope of Snow Mt. (about Summit Springs) 1554 Comment
  UCD163000  Cerastium glomeratum Craig D. Thomsen 2000-3-31 2164 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
  UCD137756  Ceratophyllum demersum J. S. Jones 1926-7-16 s.n. Colusa Colusa. Comment
  CHSC84633  Cercis occidentalis Matt Quinn 2001-3-31 38 Colusa Found along drainage flowing out of Bear Valley, near Wilbur Hot Springs, north of Highway 20. 405 Comment
  HSC66011  Cercis occidentalis Teri Bartowski, Carol Zimmerer, Ruth Takaki, Shane Feusier 1980-4-19 46 Colusa 5.4 miles from Lodoga, along Little Stony Creek at Digger Pine Campground Comment
  UC1543231  Cercis occidentalis Donald G. Nelson, et al. 1940-6-9 692 Colusa Happy Creek Camp Paradise Creek (nw corner of county, creek empties into middle fork of Stony Creek) 731 Comment
  UCR37606  Cercis occidentalis C. Houseman, M. A. Strull, L. Linstedt 1984-4-29 14 Colusa Bear Valley Rd., 2 mi north of Hwy 20 366 Comment
  RSA590197  Cercocarpus betuloides Michael A. Vincent, Robert M. Rhode 1996-3-30 7299 Colusa Along Brim Rd., 1.9 mi. W jct. Bear Valley Rd. Comment
  UCD113027  Cercocarpus betuloides G. F. Hrusa 1996-2-26 12635 Colusa Inner North Coast Ranges. E side of ridge separating Blanchard Valley from Bear Valley, on Leesville Road. 600 Comment
  UCD83634  Cercocarpus betuloides Fanny Ye; with PLB 102 class 2010-5-2 5 Colusa East slope of Walker Ridge. Along Brim Road, between Bear Valley and Walker Ridge. 493 Comment
  CAS-BOT-BC136987  Cercocarpus betuloides var. betuloides Roxana S. Ferris 1926-4-23 6419 Colusa Grade beyond Mountain House on Williams - Stonyford Road Comment
  UC1543051  Cercocarpus betuloides var. betuloides Donald G. Nelson et. al. 1940-6-8 679 Colusa several mi above Bonnie View (w boundary of Snow Mountain, Snow Mountain Trail); Snow Mountain, Snow Mountain Trail 1066 Comment
  UCD113068  Cercocarpus betuloides var. betuloides G. L. Webster 1989-5-6 7698 Colusa Near border with Lake County. Crest of Walker Ridge, near Cold Springs Mountain. Comment
  UCR206710  Cercocarpus betuloides var. betuloides George K. Helmkamp, E. A. Helmkamp 2009-3-17 14397 Colusa Inner North Coast Ranges Foothills, along CA-16 and Bear Creek, 7.0 miles south of the junction with CA-20; just north of the Yolo County line 194 Comment
  UCD57825  Chaenactis glabriuscula Gordon Harrington 2007-4-17 35 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
  JEPS90921  Chamaesyce hooveri Dean W. Taylor 1993-8-31 14071 Colusa 200 m e of North Fork Logan Creek (Sacramento Valley, Sacramento National Wildlife Refuge); Sacramento Valley, Sacramento National Wildlife Refuge 24 Comment
  CHSC113046  Chamaesyce maculata Lowell Ahart 2013-10-1 19103 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
  JEPS110186  Chamaesyce serpillifolia subsp. hirtula Lowell Ahart 2006-8-9 13115 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  CHSC113045  Chamaesyce serpillifolia subsp. serpillifolia Lowell Ahart 2013-10-1 19104 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
  CHSC61423  Chamaesyce serpillifolia subsp. serpillifolia Vernon H. Oswald; Joseph Silveira 1993-8-16 5803 Colusa Sacramento National Wildlife Refuge. Refuge located ca. 7 mi S of Willows, center N side of Tract 44, near the S boundary of the refuge. On the N bank of Hunters Creek. 24 Comment
  CHSC77333  Chamaesyce serpillifolia subsp. serpillifolia Heidi West; Joyce Lacey-Rickert 1998-10-29 Colusa Vicinity of Antelope Valley and Sites. 109 Comment
  CHSC94456  Chamaesyce serpillifolia subsp. serpillifolia Lowell Ahart 2006-8-9 13115 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UCD83717  Chamomilla suaveolens Joseph Schlottman; with PLB 102 class 2010-5-2 3 Colusa East slope of Walker Ridge. Eaton Springs. Adjacent to main creek. 710 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
  POM312492  Chenopodium album H. L. Mason, Verne Grant 1946-8-7 12978 Colusa 8 miles north of Colusa; Butte Sink. Comment
  CHSC94515  Chenopodium berlandieri Lowell Ahart 2006-8-22 13220 A Colusa South side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford. 349 Comment
  JEPS108912  Chenopodium botrys Lowell Ahart 2006-8-9 13098 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford 455 Comment
  CHSC86515  Chenopodium californicum B. Castro 2003-3-18 1385 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 213 Comment
  UC1053454  Chenopodium californicum Rimo Bacigalupi, Arthur Holmgren 1950-4-26 3167 Colusa 8 mi nw Maxwell (along road to Sites, in canyon through first hills on extreme w edge of valley); Sacramento Valley Comment
  UCD63033  Chenopodium californicum Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4685 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Along west side of Bear Creek, opposite Cowboy Canyon. 312 Comment
  JEPS75836  Chenopodium pumilio L. R. Heckard 1974-9-11 3951 Colusa edge of meadow just e Foutch Camp; Snow Mt. 1859 Comment
  SBBG115907  Chloris gayana B. Crampton 1961-7-20 5932 Colusa ca. 2 mi S of Grimes Comment
  UCD37231  Chloris gayana Beecher Crampton 1958-6-27 4980 Colusa Colusa County, 2.5 miles south of Grimes. Comment
  UCD57927  Chloris gayana Beecher Crampton 1961-7-20 5932 Colusa 2 miles S of Grimes. Comment
  CHSC77630  Chlorogalum pomeridianum Heidi West; Caroline Warren 1998-5-26 Colusa Vicinity of Antelope Valley, Huffmaster Road, and Sites. 152 Comment
  CHSC86996  Chorizanthe membranacea B. Castro 2003-5-14 1433 Colusa Vicinity of Logan Ridge, Sulphur Gap and Lurline Creek. On west edge of Sacramento Valley. 134 Comment
  HSC45743  Chorizanthe membranacea Stephen Plant 1978-4-22 216 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  UCD57280  Chorizanthe membranacea Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3648 Colusa BLM Payne Ranch. Mouth of Craig Canyon. Along unimproved road, about 2 road miles south of junction of Hwy 20 and Hwy 16. . 316 Comment
  UCR138873  Chorizanthe membranacea B. Ellyson, J. Hooke, D. Newman 1996-5-5 43 Colusa Coast Range, Leesville, 9.7 mi NW of Hwy 20 on Leesville Rd.; 70 mi east of Hwy 101 on Hwy 20 445 Comment
  RSA133247  Chrysothamnus nauseosus subsp. albicaulis Peter H. Raven, R. Snow 1959-9-11 14416 Colusa 0.5 mile south of Snow Mt. 1921 Comment
  CAS-BOT-BC279829  Cichorium intybus Roxana Stinchfield 1916-6-18 295 Colusa Near College City Comment
  SEINET3840083  Cirsium cymosum T. C. Fuller 1958-5-27 3667 Colusa south of highway 20, 1 mile west of the junction with highway 16 Comment
  JEPS81831  Cirsium cymosum var. cymosum L. R. Heckard 1969-5-28 2230 Colusa just below Candy Bucket Springs (on Stoneyford-Fouts Spring road) 670 Comment
  UC1299440  Cirsium douglasii var. douglasii Freed W. Hoffman 1947-6-19 1669 Colusa Cooks Springs North Coast Ranges Comment
  UCD159326  Cirsium occidentale D. S. Park 2010-6-5 112 Colusa Walker ridge, Cold Sring Mt. unpaved raodside, on slope. After fire. 656 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
  CHSC79776  Clarkia affinis L. P. Janeway; B. Castro 2000-5-3 6698 Colusa Vicinity of head of Antelope Creek, and Huffmaster Road. 335 Comment
  UCD64519  Clarkia affinis Craig D. Thomsen 2000-4-12 2121 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-BC164150  Clarkia concinna Peter H. Raven 1962-5-31 17909 Colusa State Highway 20, 2.5 miles east of Lake County line Comment
  CAS-BOT-BC164151  Clarkia concinna Roxana S. Ferris 1926-4-23 6408 Colusa On grade beyond the Mountain House, Williams - Stonyford Road Comment
  SD52963  Clarkia concinna Peter H. Raven 1962-5-31 17909 Colusa State Highway 20, 2.5 miles east of Lake County Line. Comment
  CAS-BOT-BC164145  Clarkia concinna David D. Keck 1933-5-30 2401 Colusa 1 mile east of Lake County line, west of Wilbur Springs Comment
  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
  UCD66706  Clarkia concinna subsp. concinna Craig D. Thomsen 2001-5-24 2502 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UC1552828  Clarkia gracilis Frederica Bowcutt 1985-5-5 506 Colusa ca. 1 mi nw Wilbur Springs Comment
  CHSC89611  Clarkia gracilis subsp. gracilis B. Castro; Aric Lester, Shirley Innecken 2004-4-12 1445 Colusa Vicinity of Antelope Valley, Huffmaster Road, and headwaters of Lurline Creek. Near bottom of secluded E-W trending side-canyon. 176 Comment
  UCD63108  Clarkia gracilis subsp. gracilis Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4939 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20. 351 Comment
  UCR228652  Clarkia gracilis subsp. gracilis Ellen Dean, Gordon Harrington, Craig D. Thomsen, S. Harrison 2008-5-18 4939 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 20 351 Comment
  HSC94165  Clarkia gracilis subsp. tracyi G. Fred Hrusa 1998-6-19 14597 Colusa Along Little Stony Creek, on Goat Mtn. Rd., ~0.5 km W of intersection with Lodoga-Stonyford Rd. 400 Comment
  UCR138658  Clarkia purpurea A. Burgard, J. Goldsmith, J. Kalt 1996-5-4 72 Colusa 8.4 mi north of Indian Reservoir Road on Walker Ridge Road; 57 mi east of Hwy 101 on Hwy 20 701 Comment
  HSC86833  Clarkia purpurea S. L. Steinwert 1985-4-13 10 Colusa Salt Canyon, N side of Salt Creek, Hwy. 20, 11 mi. WSW of Williams 143 Comment
  CHSC85962  Clarkia purpurea subsp. quadrivulnera Jenny Marr; Heidi West, Joyce Lacey-Rickert, Caroline Warren 1998-5-8 Colusa Vicinity of Sites and Antelope Valley. 152 Comment
  UC125400  Clarkia purpurea subsp. quadrivulnera Miss M. Alice King 1905-1 Colusa near Arbuckle (near College City); Sacramento Valley Comment
  UC2014170  Clarkia purpurea subsp. quadrivulnera Ellen Dean, G. Harrington, C. Thomsen, Chiao-Yi Cheng, R. Wilmarth 2009-5-20 5650 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
  UCD84560  Clarkia purpurea subsp. quadrivulnera Ellen Dean; C. Thomsen, G. Harrington, Davis Botanical Society 2010-6-5 6085 Colusa Walker Ridge. Along Walker Ridge Road, N of turnoff to Indian Valley Reservoir but S of Til Jones Springs. Many old undeveloped roads here. 817 Comment
  UCR206289  Clarkia purpurea subsp. quadrivulnera George K. Helmkamp, E. A. Helmkamp 2009-5-20 14739 Colusa Central Inner Coast Ranges, along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 320 Comment
  HSC45676  Clarkia purpurea subsp. viminea Stephen Plant 1978-4-23 229 Colusa 1.5 mi. from Bear Valley Rd. on Barlett Springs Rd. 421 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
  UCR206290  Clarkia unguiculata George K. Helmkamp, E. A. Helmkamp 2009-5-20 14738 Colusa Central Inner Coast Ranges, along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 320 Comment
  CDA11391  Claytonia exigua G. F. Hrusa, K. van Katwyk 1995-4-22 12111 Colusa Inner North Coast Ranges; Approximately 5 m. N of intersection of Walker Ridge Road and Highway 20. Comment
  SEINET199010  Claytonia exigua subsp. exigua H. K. Sharsmith 1953-6-19 4281 Colusa Mendocino National Forest ; Near Trough Springs on Trough Springs Ridge 975 Comment
  UCD64520  Claytonia parviflora Craig D. Thomsen 2000-4-12 2126 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  CHSC101069  Claytonia parviflora subsp. parviflora David W. Isle 2002-4-18 1654 Colusa N of Fouts Springs, N of Chlorinator Building and Rd to Bathhouse Trail (Snow Mtn), N aspect of E drainage. In chamise site burned in 8/8/01 Trough Fire and part of Hydromulch Soil Erosion Study Plot. 524 Comment
  CHSC91069  Claytonia parviflora subsp. parviflora D. Isle 2002-4-18 181 Colusa Mendocino National Forest--North Coast Ranges. Upper Lake Watershed. So. of Bathhouse Trail Rd. 17N51, no. of Fonts Springs. 548 Comment
  JEPS87661  Claytonia parviflora subsp. parviflora Vernon H. Oswald and Lowell Ahart 1994-4-6 6055 Colusa Goat Mtn Rd 0.1 mi ne Digger Pine Flat (s of Stonyford) 463 Comment
  SEINET199009  Claytonia parviflora subsp. parviflora H. K. Sharsmith 1953-6-19 4285 Colusa Mendocino National Forest ; Near Trough Springs on Trough Springs Ridge 980 Comment
  UC1745696  Claytonia parviflora subsp. parviflora Annetta M. Carter, Sarah Dyal, Ethel Crum 1938-5-8 1382 Colusa Between Leesville & Stonyford. 6.6 mi. S of Lodoga. 3 mi. N of Leesville. Comment
  UCD56942  Claytonia perfoliata Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3544 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Thompson Canyon. 349 Comment
  CAS-BOT-BC440035  Claytonia perfoliata subsp. perfoliata Roxana S. Ferris 1926-4-21 6311 Colusa Sycamore Slough near Sycamore Comment
  JEPS80200  Claytonia perfoliata subsp. perfoliata L. R. Heckard and J. Hickman 1980-7-3 5355 Colusa ca 10 mi w Stonyford (just w of Summit Springs); Snow Mt. 1548 Comment
  JEPS15557  Claytonia saxosa G. Thomas Robbins with L. R. Heckard 1956-7-25 3724 Colusa 0.25 mi s Snow Mt. West summit (on ridge forming s extension of Snow Mt. West, Lake-Colusa County boundary); Snow Mt. West 2103 Comment
  SFV8355  Clematis lasiantha D. Grau 1972-4-1 4 Colusa Highway 16, 5 miles south of junction with Highway 20. Comment
  UCD81223  Clematis lasiantha Ellen Dean; K. Mawdsley, B. Rice, G. Harrington, and J. Alderson 2009-5-6 5560 Colusa Payne Ranch, lands to the SW of the jct. of Hwys. 16 and 20. Destinella Flat area on the S side of Hwy. 20. Canyon to the south of Destanella Flat. 443 Comment
  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
  UCD61470  Clematis ligusticifolia Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3916 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1000 ft S of parking lot, along Bear Creek. 312 Comment
  CHSC27553  Collinsia grandiflora Scott E. Patton 1978-4-9 8 Colusa Ca. 0.3 m w of jct of Hwys. 20 and 16, s side of Bear Creek, ca. 18 m sw of Williams. 321 Comment
  CHSC39775  Collinsia grandiflora Brian H. McMurtry 1979-3-31 1 Colusa Ca. 0.3 m w of jct of Hwys. 20 and 16, s side of Bear Creek, ca. 18 m sw of Williams. 321 Comment
  SEINET12290591  Collinsia grandiflora L. L. Pate 1978-1 83 Colusa ca 0.3 mi W of jct of Hwy 20 & 16, S side of Bear Creek, ca 18 mi SW of Williams Comment
  UCD66690  Collinsia greenei Craig D. Thomsen 2000-5-11 2321 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
  UC1613286  Collinsia heterophylla Charles M. Belshaw Apr 1937 2884 Colusa vicinity of Cook's Spring (Inner North Coast Range, Devil's Ridge); Inner North Coast Range, Devil's Ridge Comment
  CHSC88866  Collinsia sparsiflora Christine Hantelman 2000-4-1 39 Colusa In Bear Valley. West side of creek. Comment
  CDA34091  Collinsia sparsiflora P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  UCD82370  Collinsia sparsiflora Robin McMaster 1973-4-15 343 Colusa 0.5 mi towards Bartlett Springs from Bear Valley Road. 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
  JEPS80164  Collinsia torreyi var. wrightii L. R. Heckard with J. Hickman 1980-7-2 5315 Colusa ca 10 mi w Stonyford (trail from Frog Pond to Milk Ranch, w of West Peak, Snow Mt.); Snow Mt. 1950 Comment
  HSC31583  Collomia diversifolia Thomas E. Higley 1974-5-4 70 Colusa 3/4 mi. N of T junction of Indian Valley. 854 Comment
  HSC31719  Collomia diversifolia Teresa Prendusi 1974-5-4 51 Colusa Beyond Clyde Mine 1/8 mi. 854 Comment
  UCD81711  Collomia diversifolia Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5717 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones Spring area on W side of road, ca. 6.5 road mi N of junction with Hwy 20. W side of road. 833 Comment
  UCD81856  Collomia diversifolia Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5740 Colusa Walker Ridge. Along Walker Ridge Road. Lookout area with fence and view of Indian Valley Reservoir. North of turnoff to Indian Valley Reservoir and S of turnoff to picnic area. W side of road. 1061 Comment
  UCD73112  Conium maculatum Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3826 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. West side of Bear Creek, ca. 0.25 mile downstream of bridge. 246 Comment
  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
  NY28942  Cordylanthus palmatus D. W. Taylor 1988-8-8 10024 Colusa This specimen represents an endangered or threatened species. The specific locality has been removed from this record to protect this species from over-collection. These data may be supplied to researchers on request. Comment
  RSA0084707  Cordylanthus palmatus Ellen Cypher 2004-9-9 2004 -018 Colusa Delevan National Wildlife Refuge, Tract 33, CNDDB EO# 20 17 Comment
  RSA0084708  Cordylanthus palmatus Ellen Cypher 2005-8-22 2005 -023 Colusa Delevan National Wildlife Refuge, Tract 12, CNDDB EO# 13 18 Comment
  CDA16105  Cordylanthus pilosus G. F. Hrusa, Dmitri Geltman (LE) 1999-8-18 15248 Colusa North Coast Ranges; Cedar Camp- Goat Mtn. Rd. 792 Comment
  UC71772  Cordylanthus pilosus subsp. pilosus H. P. Chandler 1905-10-14 Colusa Princeton Comment
  UCD123117  Cordylanthus pringlei Craig Thomsen; Art Shapiro 2004-9-16 s.n. Colusa along Cool Springs Road. Comment
  SBBG50832  Cornus glabrata J. K. Clark 1966-5-8 23 Colusa Lodoga to Stonyford Rd, 2.5 mi NW of Lodoga 320 Comment
  JEPS118675  Cotula coronopifolia B. Castro, L. P. Janeway 2011-4-27 1863 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; approximately 1 mi southeast of Funks Reservoir and 800 ft northeast of Tehama-Colusa Canal. Sites 7.5' quad. Comment
  RSA730236  Cotula coronopifolia R. R. Halse 2007-3-23 7109 Colusa Williams; by junction of 5th Street and B Street 25 Comment
  UCD159525  Cotula coronopifolia D. S. Park 2011-4-6 274 Colusa On side of Putnam Rd. Along ditch/small creek. Growing in abundance. Flooded. 24 Comment
  UCD64262  Crassula connata Craig D. Thomsen 2000-3-31 2059 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCD38810  Crepis acuminata Beecher Crampton 1958-5-19 4803 Colusa 5.5 miles south of Ladoga. Comment
  HSC72210  Crepis monticola Thomas W. Nelson, Jane P. Nelson 1980-6-24 5874 Colusa Colusa-Lake County line; Along trail to Snow Mtn. ca. 1/2 mi. from trailhead 1616 Comment
  CHSC107292  Cressa truxillensis L. P. Janeway; B. Castro 2011-7-9 10510 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 1.5 km southeast of Funks Reservoir and 0.1-0.6 km northeast of Tehama-Colusa Canal. Just off of the northwest corner of the marsh. 49 Comment
  RSA747233  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
  CAS-BOT-BC190084  Crypsis schoenoides James Jokerst 1985-4-24 2494 Colusa Near Lurline Creek. 41 Comment
  CAS-BOT-BC190085  Crypsis schoenoides Milo S. Baker 1946-9-4 11621 Colusa Butte Sink near locked Gate of Colusa Gun Club. Comment
  CHSC107967  Crypsis schoenoides B. Castro; L. Janeway 2011-7-9 1896 Colusa Sacramento Valley. Extreme W edge of Sacramento Valley; ca 5 air mi NW of Maxwell, 0.8 mi SE of Funks Reservoir and 0.3 mi NE of Tehama-Colusa Canal. In small vernally moist pothole off S edge of a grain field, at NW end of vernally moist swale connected to a large +- saline/alkaline wetland/marsh about 0.2 mi to the S. 49 Comment
  CHSC77404  Crypsis schoenoides Heidi West; Joyce Lacey-Rickert 1998-10-29 Colusa Vicinity of Antelope Valley and Sites. 109 Comment
  CHSC80307  Crypsis schoenoides B. Castro; G. Kuenster 2000-7-19 1205 Colusa Vicinity of Maxwell, Funks Creek, and the Glenn-Colusa canal. 48 Comment
  UC1259361  Crypsis schoenoides Barry Hammel 1976-8-5 427 Colusa e side of Hwy 45 near Colusa Golf Club 30 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
  UCD55460  Crypsis schoenoides Ellen Dean; Gordon Harrington 2006-10-6 3284 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 381 Comment
  CAS-BOT-BC190166  Crypsis vaginiflora H. S. Yates 1936-8-14 6131 Colusa 3 miles south of Colusa. 15 Comment
  RSA126601  Crypsis vaginiflora H. S. Yates 1936-8-14 6136 Colusa 6 miles S. of Grimes 15 Comment
  RSA268076  Crypsis vaginiflora J. R. Reeder, C. G. Reeder 1972-6-6 5657 Colusa ca. 8 miles W of Live Oak, one mile S of Wildlife Area headquarters. 183 Comment
  UC1131372  Crypsis vaginiflora H. S. Yates 1936-8-14 6131 Colusa 3 mi s Colusa; Colusa Quadrangle 15 Comment
  UCD59963  Crypsis vaginiflora Beecher Crampton 1958-6-27 4986 Colusa 3.5 miles south of Colusa. Comment
  UCD56918  Cryptantha Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3521 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. In Craig Canyon. 334 Comment
  RSA216793  Cryptantha excavata Robert F. Hoover 1968-5-27 11099 Colusa Bear Creek canyon N. of Highway 20 (near Wilbur Springs) Comment
  JEPS81272  Cryptantha flaccida L. R. Heckard and J. C. Hickman 1982-7-5 5882 Colusa s of (slope below area) Summit Springs (s side of Snow Mt.); Snow Mt. 1500 Comment
  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
  UC78716  Cryptantha flaccida T. S. Brandegee Apr 1889 Colusa Leesville Comment
  UCD56903  Cryptantha flaccida Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3506 Colusa BLM Payne Ranch. Entrance to Craig Canyon on west side of Hwy. 16. Ca. 2 road miles south of junction of Hwy. 16 and Hwy. 20. 304 Comment
  UCR44920  Cryptantha hendersonii L. F. LaPre 1986-5-30 s.n. Colusa 1.5 mi west of Mendocino National Forest Boundary on Stony Creek Rd [c. 4 mi. west of Stonyford] 671 Comment
  SEINET7881830 Image available Cryptantha hendersonii Helen K. Sharsmith 1953-1 4278 Colusa One mile north of Trough Springs on Trough Springs Ridge; Mendocino National Forest 914 Comment
  CHSC106242  Cryptantha hispidula B. Castro; L. P. Janeway 2001-6-3 1258 B Colusa Inner North Coast Ranges. Spring at Grapevine flat, on top of Walker Ridge about 0.5 mi E of Baldy Mountain. East-facing slope/bench with large springy/meadowy area. At upper edges of meadow. 883 Comment
  HSC48141  Cryptantha hispidula Thomas W. Nelson, Jane P. Nelson 1978-4-30 3969 Colusa Along SR 20 just E of Colusa-Lake County line 549 Comment
  UC1178523  Cryptantha hispidula Leo Koch 1940-4-29 936 A Colusa near Lake and Colusa county line (along Hwy 20) Comment
  UCD63124  Cryptantha hispidula Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4954 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20. 416 Comment
  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
  UCD82527  Cryptantha hispidula Craig Thomsen; G. Harrington 2009-5-12 2883 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
  UCD83811  Cryptantha hispidula Ellen Dean; G. Harrington, K. Mawdsley, J. Shepard 2010-5-1 5958 Colusa Walker Ridge, along Walker Road, just N of main turnoff to Barrel Springs. 712 Comment
  SEINET7883435 Image available Cryptantha hispidula Leo Koch 1940-1 936 a Colusa Serpentine hill near Lake and Colusa county line along Highway 20, Williams Highway Comment
  UC638656  Cryptantha intermedia Ethel Crum 1938-5-8 2027 Colusa 3 mi n Leesville; Inner North Coast Range Comment
  UC971695  Cryptantha intermedia Leo Koch 1940-4-29 936 b Colusa near Lake and Colusa County (along Highway 20; Williams Highway) Comment
  UCR198141  Cryptantha intermedia Ellen Dean, C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3673 Colusa BLM Payne Ranch, lands to the southwest of junction of Hwy 20 and Hwy 16. Thomposon Canyon, near juncture with Craig Canyon, above Thompson Creek 366 Comment
  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
  JEPS120983  Cryptantha intermedia var. intermedia Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18630 Colusa On N side of Hwy 20, just E of Lake County Line, 12.2 air miles ENE of town of Clear Lake, 17.1 air miles W of Williams. Comment
  UCD164048  Cryptantha intermedia var. intermedia Richard Philbrook 2016-4-9 5 Colusa BLM Bear Creek Ranch (Previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. Just southwest of corral at junction of 16 and 20. Summit of hill. 509 Comment
  CHSC79477  Cryptantha microstachys B. Castro; L. P. Janeway 2000-5-4 1142 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 249 Comment
  UC78682  Cryptantha microstachys K. Brandegee Apr 1889 Colusa Epperson's Comment
  UC1051698  Cryptantha milobakeri Helen K. Sharsmith 1953-6-19 4279 Colusa 1 mi n Trough Springs (on Trough Springs Ridge); Inner North Coast Ranges, Mendocino National Forest 914 Comment
  UC1731395  Cryptantha muricata Dean W. Taylor 1998-6-16 16662 Colusa Sulphur Creek canyon 0.5 mi below (e) Wilbur Springs (n-facing shale slide); North Coast Ranges, Walker Ridge and vicinity 381 Comment
  UC596361  Cryptantha nemaclada R. F. Hoover 1938-4-24 3217 Colusa w of Arbuckle (Sand Creek foothills); Sand Creek Comment
  UC78651  Cryptantha nemaclada Katharine Curran 1884-1 Colusa Comment
  UC1299423  Cryptantha simulans Freed W. Hoffman 1947-6-19 1620 Colusa road from Stonyford to Fouts Springs (w Colusa County); North Coast Ranges Comment
  CHSC47984  Cryptantha torreyana Vernon Oswald 1986-6-30 2177 Colusa Northwest side of Lily Pond near Letts Lake. Roadway. 1188 Comment
  RSA589940  Cupressus macnabiana Michael A. Vincent, Robert Rhode 1996-3-30 7307 Colusa Along Walker Ridge Road, 1.0 miles S of junction with Brim Road Comment
  UCD110851  Cupressus macnabiana Christopher Mallek 2008-1 WR- 1 Colusa Walker Ridge. Border of Colusa and Lake Counties. 802 Comment
  CHSC44829  Cupressus sargentii David Isle 1978-5-16 Colusa Frenzel Creek Research Area, about 10 mi SW of Stonyford, on Goat Mountain Road. Comment
  UC1585395  Cupressus sargentii R. Raiche 1989-11-1 90339 Colusa W of Williams, NW of Wilbur Springs, Walker Ridge, Freshwate Branch of E Fork Sulphur Creek between Signal Rock and Oak Grove 730 Comment
  NY16797  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
  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
  SEINET3157202  Cycladenia humilis T. S. Brandegee 1890-6-23 sn Colusa Snow Mountain Comment
  UCD60064  Cynodon dactylon Beecher Crampton 1963-9-9 6891 Colusa 1/4 mile E of Cortena. Comment
  UCD60101  Cynodon dactylon Dorman Sumner 1958-5-27 s. n. Colusa 6.5 miles south of College City, Howard Johnson Ranch. Comment
  UCD72464  Cynodon dactylon Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3798 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. Bank of Bear Creek near north end of bridge, west side of creek. 260 Comment
  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
  HSC62811  Cynoglossum grande Rick Lundquist 1979-4-14 19 Colusa Buck Flat, on Walker Ridge Rd. 884 Comment
  UCD56936  Cynoglossum grande Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3538 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Thompson Canyon. 344 Comment
  CHSC94416  Cyperus difformis Lowell Ahart 2006-8-9 13143 Colusa North side and just east of the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS64066  Cyperus difformis W. L. Jepson 1929-10-1 15343 Colusa Maxwell 25 Comment
  UC1100541  Cyperus difformis Malcolm A. Nobs and S. Galen Smith 1949-9-9 1877 Colusa 3 mi. w. Williams Comment
  SEINET8756311 Image available Cyperus difformis June McCaskill 1954-8-9 362 Colusa ca. 2 miles east of Princeton and 400 yards south of Glenn County line Comment
  CAS-BOT-BC114573  Cyperus eragrostis Roxana Judkins [later Mrs. Ferris q.v.] Stinchfield 1916-7-9 419 Colusa On Phillips ranch, near Sycamore. Comment
  CHSC94430  Cyperus eragrostis Lowell Ahart 2006-8-22 13209 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  CAS-BOT-BC114386  Cyperus erythrorhizos Herbert L. Mason 1945-9-19 12724 Colusa Below causway over Butte Sink spillway, E bank of Sacramento River, 1 mi N of Colusa. Comment
  CHSC61686  Cyperus erythrorhizos Vernon H. Oswald 1993-9-1 5891 Colusa Sacramento National Wildlife Refuge. Refuge located ca. 7 mi S of Willows, E side of Cell 2, Pool 12, near the S boundary of the refuge. 22 Comment
  POM313103  Cyperus erythrorhizos H. L. Mason 1945-9-19 12724 Colusa Below caus[e]way over Butte Sink spillway, East bank of Sacramento River, 1 mile north of Colusa. Comment
  UC1100516  Cyperus erythrorhizos Herbert L. Mason and Verne Grant 1946-8-7 12984 Colusa 8 mi. n. Colusa (Butte Sink); Butte Sink Comment
  CHSC91049  Cystopteris fragilis D. Isle 2003-6-9 361 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. In drainage that feeds Cedar Creek. 1447 Comment
  JEPS73451  Cystopteris fragilis L. R. Heckard 1972-7-8 3048 Colusa n side ridge running se of Snow Mt (West Peak) 2011 Comment
  CAS-BOT-BC445508  Damasonium californicum A. A. Heller; H. E. Brown 1902-5-1 5437 Colusa Near Colusa Comment
  UC194964  Damasonium californicum H. M. Hall 1916-8-10 10265 Colusa Colusa Sacramento Valley, Colusa Comment
  CAS-BOT-BC445507  Damasonium californicum J. Clausen 1935-5-20 1017 Colusa Ca. 27 mi. W. of Williams after having passed the Wilbur Springs road. Along Bear Creek Comment
  CAS-BOT-BC445510  Damasonium californicum H. M. Hall 1916-8-10 10265 Colusa Colusa (4 mi. west). Comment
  POM208489  Damasonium californicum H. M. Hall 1916-8-10 10265 Colusa Sacramento Valley. Comment
  JEPS108890  Datisca glomerata Lowell Ahart 2006-8-9 13146 Colusa North side and just east of the bridge across Stony Creek, just north of Stonyford 347 Comment
  UCD81715  Datisca glomerata Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5721 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones Spring area on W side of road, ca. 6.5 road mi N of junction with Hwy 20. W side of road. 833 Comment
  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
  JEPS81326  Daucus pusillus L. R. Heckard and J. C. Hickman 1982-7-6 5941 Colusa ca. 1/2 mi. n.e. Summit Springs (e. of trail, s. side Snow Mt.); Snow Mt. 1645 Comment
  UCD38811  Daucus pusillus Beecher Crampton 1958-5-19 4797 Colusa 10.1 miles southeast of Leesville. Comment
  POM174571  Daucus pusillus Roxana S. Ferris 1926-4-23 6587 Colusa 2 miles from Stony Ford. Comment
  UCR254940  Delphinium Greg de Nevers 1995-5-27 10732 Colusa Near Lodoga 370 Comment
  JEPS81344  Delphinium antoninum L. R. Heckard and J. C. Hickman 1982-7-7 5957 Colusa Middle Fork of South Fork of Stony Creek Snow Mt. (originating in Veratrom Meadow before Milk Ranch) 1935 Comment
  UCD57667  Delphinium hesperium Erica A. Smith; with Plant Biology 102 2007-4-29 5 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central/Eastern part of ranch. Craig Canyon. Along unimproved road, just west of where road crosses Craig Creek. 313 Comment
  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
  UCD148525  Delphinium hesperium subsp. pallescens G. F. Hrusa; K. van Katwyk 1995-4-22 12137 Colusa on south side of Leesville Road approximately 3 miiles north of Highway 20. 290 Comment
  UCD163698  Delphinium hesperium subsp. pallescens Craig Thomsen 1999-5-10 2004 Colusa Bear Valley. About 8 miles north of Hwy 20. Comment
  JEPS6254  Delphinium hesperium subsp. pallescens W. L. Jepson 1932-5-7 16261 Colusa Venado (2 mi. above, in a little valley), Southwestern Colusa County 304 Comment
  HSC41862  Delphinium nudicaule K. Irwin 1977-4-24 302 Colusa Along Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  CAS-BOT-BC8058  Delphinium nuttallianum Roxana S. Ferris 1917-4-14 550 Colusa Foothills, 7 mi. west of Arbuckle along Arbuckle-Rumsey Road 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-BC17110  Delphinium uliginosum D. E. Breedlove 1963-5-30 5184 Colusa 17 miles E of Bartlett Springs Comment
  POM174567  Delphinium variegatum Roxana S. Ferris 1926-4-23 6582 Colusa 2 miles from Stony Ford. Comment
  SEINET12090857  Delphinium variegatum Unknown 1962-1 651 Colusa ca 200 yards W of road, on road along Bear Creek from State highway 20 north to Leesville, 3.6 mi N 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
  UCD82702  Delphinium variegatum Robin McMaster 1973-4-15 357 Colusa Walker Ridge Hunting Access. 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
  UC583162  Delphinium variegatum subsp. variegatum Lewis S. Rose 1936-4-27 36177 Colusa hills 10 mi nw Rumsey 213 Comment
  CAS-BOT-BC16956  Delphinium variegatum subsp. variegatum Wayne Roderick 1967-5-7 s.n. Colusa Bear Valley 304 Comment
  HSC96712  Delphinium variegatum subsp. variegatum Kay Izlar 2001-4-21 5 Colusa Bear Valley Rd. off Hwy. 20 415 Comment
  UCD61143  Deschampsia cespitosa Freed W. Hoffman 1944-7-13 1949 Colusa Between Indian and Bear valleys. Comment
  JEPS75874  Deschampsia cespitosa subsp. cespitosa L. R. Heckard 1974-9-9 3866 Colusa just n.e. of rocky promontory s.e. of Foutch Camp (Snow Mt.); Snow Mt. 1920 Comment
  JEPS80431  Deschampsia cespitosa subsp. cespitosa L. R. Heckard 1974-9-9 3867 Colusa just n.e. of rocky promontory s.e. of Foutch Camp (Snow Mt.); Snow Mt. 1920 Comment
  CHSC85968  Deschampsia danthonioides Jenny Marr; Heidi West, Joyce Lacey-Rickert, Caroline Warren 1998-5-8 Colusa Vicinity of Sites and Antelope Valley. 91 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
  UCD82860  Deschampsia danthonioides Gordon Harrington 2008-4-13 71 Colusa BLM Payne Ranch. Just SW of the Hwy 20-Hwy 16 intersection, SW of the corral. 324 Comment
  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
  UC1950419  Deschampsia elongata Barbara Ertter 1989-7-1 8609 Colusa road to Goat Mt Lookout 1.7 mi S of Rt M-10 (Bear Creek-Fouts Spring Rd) at head of S Fk Stony Creek, ca 12 airmiles WSW of Stonyford; NE-facing slope Comment
  CHSC79752  Dicentra chrysantha L. P. Janeway; B. Castro 2000-5-1 6686 Colusa Vicinity of Grapevine Creek and Sites-Lodoga Road. 243 Comment
  UC1051506  Dicentra chrysantha Helen K. Sharsmith 1953-6-19 4277 Colusa 1 mi n Trough Springs (on Trough Springs Ridge); Inner North Coast Ranges, Mendocino National Forest 914 Comment
  CHSC27508  Dichelostemma capitatum subsp. capitatum Michael F. Henetz 1978-4-15 4 Colusa Ca. 100 m s of Hwy. 20, ca. 0.5 km w of junction of Hwy 20 and Hwy. 16, ca. 29 km s of Williams. 322 Comment
  HSC31718  Dichelostemma capitatum subsp. capitatum Teresa Prendusi 1974-5-4 50 Colusa Beyond Clyde Mine 1/8 mi. 854 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
  UCD163683  Dichelostemma capitatum subsp. capitatum Craig Thomsen 1999-4-15 1984 Colusa Bear Valley. About 5 miles north of Hwy 20, west of Bear Valley Rd. Comment
  UCR206370  Dichelostemma capitatum subsp. capitatum George K. Helmkamp, E. A. Helmkamp 2009-3-11 14366 Colusa Inner North Coast Range Foothills, along CA-20, 9.7 miles southwest of Williams, on the north side of Salt Creek 162 Comment
  HSC22054  Dichelostemma capitatum subsp. capitatum D. R. Junell 1965-4-18 23 Colusa 2 mi. E on Hwy. 16 from junction with Hwy. 20 Comment
  CAS-BOT-BC502550  Dichelostemma congestum Roxana S. Ferris 1926-4-21 6309 Colusa Sycamore Slough near Sycamore Comment
  UCD139269  Dichelostemma volubile K. Esau 1934-5-5 s.n. Colusa Tahoe-Ukiah Highway, west of Williams. Comment
  CAS-BOT-BC277740  Dichelostemma volubile Mona Bourell 1997-3-29 5808 Colusa Mendocino National Forest along Road near Brittan Ranch, 0.1 mi. N of North Fork Campground Comment
  SEINET8476802  Dichelostemma volubile R. R. Halse 1989-5-7 3826 Colusa Along the Leesville Road, ca 3 miles SE of Leesville. 480 Comment
  JEPS110360  Digitaria sanguinalis Lowell Ahart 2006-8-22 13226 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  CHSC94637  Diplacus layneae Lowell Ahart 2006-6-11 12664 Colusa On the east side of an off road trail (Trail 30), about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford. 613 Comment
  SEINET8235421  Diplacus layneae Unknown 1959-5-27 1338 Colusa by Cooks Creek; about 1/4 mile east of Cooks Spring. 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
  RSA0114870  Distichlis spicata Lowell Ahart 2015-4-28 20116 Colusa North side of Maxwell-Colusa Road, about 5 1/2 miles east of Maxwell. 571 Comment
  UCD61480  Distichlis spicata Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3887 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1000 ft NW of parking lot. 339 Comment
  UCD64488  Distichlis spicata var. stricta K. Esau; D. Hartmann 1941-7-17 Colusa West of Williams. Comment
  SEINET176835 Image available Dodecatheon hendersonii Victor Duran 1933-4-2 3378 Colusa Stonyford. 305 Comment
  UC1192040  Downingia insignis Herbert L. Mason 1953-4-5 14506 Colusa 3 mi e Maxwell Comment
  UC625519  Downingia insignis Frank W. Gould 1938-4-23 295 Colusa between Arbuckle and Williams Comment
  UCD18837  Downingia insignis Vernal Pool Team 2001; Carol Witham and Jennifer Buck 2001-4-30 144 Colusa 2 mi. south of the town of Colusa along Hwy 20, east of Hwy 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001, UTMs: 10S0587786; 4336302. Comment
  UCD81238  Dudleya cymosa Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5402 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Edge of Bear Creek, near mouth of canyon located to the south of Brophy Canyon. 223 Comment
  CHSC112645  Dysphania botrys Lowell Ahart 2013-10-1 19087 Colusa Inner North Coast Range. Strand of East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  JEPS110361  Echinochloa crus-galli Lowell Ahart 2006-8-22 13215 Colusa South side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford 349 Comment
  SEINET241777 Image available Echinochloa crus-galli Beecher Crampton 1965-7-8 7448 Colusa 4.5 miles south of Grimes Comment
  UCD32928  Echinochloa crus-galli Beecher Crampton 1965-7-8 7448 Colusa Colusa County, 4.5 miles south of Grimes. Comment
  UCD32929  Echinochloa crus-galli Beecher Crampton 1965-7-8 7448 a Colusa Colusa County, 4.5 miles south of Grimes. Comment
  UCD60898  Echinochloa crus-galli K. Esau and D. Hartman 1941-7-17 Colusa Near Williams. Comment
  UCD61073  Echinochloa muricata P. B. Kennedy 1925-9-18 Colusa Cortena. Comment
  CAS-BOT-BC197273  Echinochloa muricata var. microstachya Malcom A. Nobs; S. Galen Smith 1949-9-9 1874 Colusa 3 miles west of Williams Comment
  UCD61167  Echinochloa oryzicola P. B. Kennedy 1925-9-18 Colusa Rice Station, Cortena. Comment
  CDA184  Echinochloa oryzoides P. B. Kennedy 1928-9-15 Colusa Rice Station, Cortena. 0 Comment
  UCD61170  Echinochloa oryzoides P. B. Kennedy 1925-9-18 Colusa Rice Station, Cortena. Comment
  UCD61175  Echinochloa oryzoides P. B. Kennedy 1928-9-15 Colusa Cortena. Comment
  CHSC84967  Echinodorus berteroi Lowell Ahart 2003-10-23 10671 Colusa On the east strand of East Park Reservoir, about 1/8 mile northwest of Sites Lodoga Road, about 1 mile north of Lodoga, about 21 miles west of Maxwell. 368 Comment
  UC1562615  Echinodorus berteroi Barbara Ertter with Elizabeth Neese, Laura Fujii, and Dawn Espindola 1989-10-21 8879 Colusa n.w. side East Park reservoir (near end of East Park Rd. from Stonyford) 365 Comment
  CDA19006  Echinodorus berteroi R. Breckenridge 2000-9-25 PDR 958948 Colusa East Park Reservoir, vicinity of Stonyford. 0 Comment
  UCD137955  Echinodorus berteroi June McCaskill; W. A. Harvey 1954-8-9 368 Colusa west side of pete Bartnett's house, Tule Road, around 7 miles east of Arbuckle. Comment
  UCD38843  Echinodorus berteroi Beecher Crampton 1958-6-27 4983 Colusa Colusa County; five miles south of Colusa. Comment
  UCD170084  Ehrendorferia chrysantha Jack Alderson 2016-5-14 s.n. Colusa BLM Bear Creek Ranch (formerly Payne Ranch); 5500 feet (1675 m) south of the intersection of Highway 20 and the Colusa County line. 499 Comment
  UCD95151  Ehrendorferia chrysantha K. Esau 1934-5-5 s.n. Colusa above Williams, Tahoe-Ukiah Highway. Comment
  UC1100601  Eleocharis engelmannii Malcolm A. Nobs, S. Galen Smith 1949-7-18 1006 Colusa 2.5 mi W of Williams Comment
  CAS-BOT-BC113364  Eleocharis engelmannii Malcom A. Nobs; Stanley Galen [S. Galen] Smith 1949-7-18 1006 Colusa West of Williams, 2.5 miles. Comment
  CAS-BOT-BC113365  Eleocharis engelmannii Malcom A. Nobs; Stanley Galen [S. Galen] Smith 1949-7-18 1006 Colusa West of Williams, 2.5 miles. Comment
  UCD49591  Eleocharis engelmannii S. Galen Smith; Malcolm A. Nobs 1949-9-9 1878 Colusa Rice fields 3 miles W of Williams. Comment
  CHSC107160  Eleocharis macrostachya L. P. Janeway; B. Castro 2011-5-19 10288 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 1.8 km southeast of Funks Reservoir and 0.2 km northeast of Tehama-Colusa Canal. Large +- alkaline vernal pool/marsh; mucky clay soil. Mass of this along south edge of the marsh. Occasional patches of this scattered through much of the marsh. 49 Comment
  CHSC79049  Eleocharis macrostachya J. Marr; C. Warren, H. West 1998-7-1 Colusa West of Maxwell, vicinity of Logan Ridge and Funks Creek, in vernal pool in narrow valley bottom west of ridge. 106 Comment
  CHSC79857  Eleocharis macrostachya 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. 628 Comment
  UC1100742  Eleocharis macrostachya Herbert L. Mason, Verne Grant 1946-8-6 12965 B Colusa 4 mi S of Colusa (pond on Colusa - Marysville Highway, W side of Sacamento River) Comment
  UCD57106  Eleocharis macrostachya Gordon Harrington; Diana Hickson 2007-4-7 0026 Colusa Colusa Co. Ca. BLM Payne Ranch, SW intersection of Hwy 16 and Hwy 20, .25 m NW of Roadkill Cafe. 427 Comment
  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
  UCD163346  Eleocharis parishii Craig D. Thomsen 2000-5-11 2352 Colusa Walker Ridge. Buck Flat. 129 Comment
  UCD61458  Eleocharis parishii Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3904 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1 mile SW of parking lot. 390 Comment
  UCD63131  Eleocharis parishii Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4961 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Meadow to the east of Destinella Flat, ca. 3 rd miles west of the junction with Hwy 16 on the south side of Hwy 20. 526 Comment
  UCD82516  Elymus elymoides Craig Thomsen; G. Harrington 2009-5-12 2874 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  JEPS75852  Elymus elymoides subsp. elymoides L. R. Heckard 1974-9-10 3896 Colusa East Peak Snow Mt. (e slope) 2103 Comment
  UC1055953  Elymus elymoides subsp. elymoides Helen K. Sharsmith 1953-6-19 4267 Colusa Red Bridge Camp Inner North Coast Ranges, Mendocino National Forest (near confluence of North and Middle Forks of Stoney Creek) 548 Comment
  JEPS75758  Elymus glaucus subsp. glaucus L. R. Heckard and R. Bacigalupi 1976-9-6 4441 Colusa just e Fouts Camp; Snow Mtn. 1859 Comment
  JEPS75859  Elymus glaucus subsp. jepsonii L. R. Heckard 1974-9-10 3891 Colusa uppe reaches of creek s East Peak; Smow Mtn., Dark Hollow Creek 2011 Comment
  JEPS80218  Elymus multisetus L. R. Heckard and J. Hickman 1980-7-3 5374 Colusa slope above Summit Springs (sw slope of mt.); Snow Mt. 1554 Comment
  UC1146624  Elymus trachycaulus Freed W. Hoffman 1944-7-13 1964 Colusa between Indian Valley and Bear Valley (w Colusa Co,); North Coast Ranges Comment
  UCR257974  Elymus trachycaulus Ellen Dean, Craig D. Thomsen, Gordon Harrington, R. Wilmarth, R. Wenk 2010-6-2 6067 Colusa On Lake County border. Walker Ridge, along Walker Ridge Road, Buck Flat 873 Comment
  UCD62670  Elymus trachycaulus subsp. trachycaulus G. L. Stebbins Jr. 1939-7-11 2957 Colusa 3 miles west of Leesville. Comment
  CHSC110861  Emmenanthe penduliflora David Isle; Rhonda Isle 2013-5-19 2041 Colusa 0.1 mi W of Maxwell Grade Summit; burned NW asp. S of Sites Lodoga Road. 7/12 Sites Fire Area. 10S 0546355E 4355688N. 548 Comment
  SEINET8731329 Image available Emmenanthe penduliflora Helen K. Sharsmith 1953-1 4406 Colusa Among Adenostoma chaparral, edge of road, Trough Springs Ridge, Mendocino National Forest 610 Comment
  CHSC90779  Emmenanthe penduliflora var. penduliflora D. Isle 2002-4-18 183 Colusa Mendocino National Forest--North Coast Ranges. Upper Lake Watershed. S. of Bathhouse Trail Rd. 17N51, N. of Fouts Springs. 548 Comment
  UCD105289  Epilobium brachycarpum C. F. Dunshee 1922-7-28 22 Colusa Cortina. Comment
  UC73325  Epilobium campestre Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  CHSC94526  Epilobium ciliatum subsp. glandulosum Lowell Ahart 2006-8-9 13139 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS75736  Epilobium densiflorum L. R. Heckard 1974-9-9 3878 Colusa about 1/4 mi e Foutch Camp 1828 Comment
  SBBG119942  Epilobium densiflorum L. Ahart 2006-8-9 13140 Colusa N side and under the bridge across Stony Crk, just N of Stonyford 347 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
  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
  JEPS120978  Epilobium minutum Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18649 Colusa On N side of Hwy 20, just E of Lake County Line, 12.2 air miles ENE of town of Clear Lake, 17.1 air miles W of Williams. Comment
  JEPS94775  Epilobium minutum Vernon Oswald and Lowell Ahart 1998-5-7 9005 Colusa Bartlett Springs Road 2.1 mi w of Bear Valley Road (0.8 mi e of Sawtelle Valley and Grapevine Flat Roads); Bartlett Springs Road 524 Comment
  UCD81733  Epilobium minutum Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5735 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
  POM256523  Epilobium minutum E. K. Crum 1938-5-8 2026 Colusa 3 miles north of Leesville. Comment
  CHSC94473  Epilobium torreyi Lowell Ahart 2006-8-9 13117 A Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS80190  Epilobium torreyi L. R. Heckard and J. Hickman 1980-7-3 5341 Colusa just w Summit Springs (ca 10 mi w of Stonyford, Colusa-Lake Co. boundary); southwest Snow Mt. 1548 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
  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
  UCD70303  Equisetum laevigatum D. Sanchez-Mata 1998-7-10 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain Road between Lodoga and Red Rock Cabin. Serpentine riparian alder forests (Alnus rhombifolia) growing on alluvial sands at Stoney Creek. 420 Comment
  RSA724897  Equisetum telmateia var. braunii L. Ahart 2006-8-22 13211 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
  CAS-BOT-BC213552  Eragrostis hypnoides Roxana Stinchfield 1916-7-8 383 Colusa In bed of Sycamore Slough. Comment
  JEPS120803  Eragrostis hypnoides Lowell Ahart 2013-10-1 19077 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
  RSA0105552  Eragrostis hypnoides Lowell Ahart 2013-10-1 19077 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
  RSA129661  Eragrostis hypnoides H. S. Yates 1936-8-14 6139 Colusa 3 miles S. of Grimes 15 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
  CHSC94425  Eragrostis pectinacea var. pectinacea Lowell Ahart 2006-8-22 13206 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS80252  Eremocarpus setiger L. R. Heckard and J. Hickman 1980-9-15 5431 Colusa slopes w Summit Springs; Snow Mt. 1554 Comment
  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
  JEPS83809  Ericameria greenei L. R. Heckard and J. Hickman 1980-9-16 5463 Colusa West Peak Snow Mt. (n slope) 2042 Comment
  RSA589927  Ericameria linearifolia Michael A. Vincent, Robert Rhode 1996-3-30 7310 Colusa Along Walker Ridge Road, 11.5 miles S of junction with Brim Road Comment
  UCR80265  Ericameria linearifolia J. P. Smith, Thomas Nelson, Jane Nelson 1978-4-1 9527 Colusa Walker Ridge Road, 3.2 mi. from its junction with State Route 20. Comment
  UCD131766  Erigeron canadensis P. B. Kennedy 30-31 May 1922 s.n. Colusa near Cortina. Comment
  CHSC91047  Erigeron petrophilus var. petrophilus D. Isle 2003-6-12 372 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. Ridgetop, GPS 10S 524888E 4345370N. 1816 Comment
  JEPS80811  Erigeron petrophilus var. petrophilus L. R. Heckard and J. C. Hickman 1981-7-31 5784 Colusa e side Snow Mt. (rock promontory called Fouts Springs Overlook); , Fouts Springs Overlook 1798 Comment
  CAS-BOT-BC216002  Eriodictyon californicum Roxana S. Ferris 1926-4-23 6431 A Colusa Near summit of grade on Williams - Stonyford Road Comment
  RSA401486B  Eriodictyon californicum Carolyn Sanford 1977-4-24 s.n. Colusa Dry hillsides along Walker Ridge Road above Barrel Springs Campground. 701 Comment
Read comments
Jul 31 2014
  SD53208  Eriodictyon californicum D. F. Howe 1962-5-19 3284 Colusa 13 miles west of Williams on # 20 213 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
  UCR206378  Eriodictyon californicum George K. Helmkamp, E. A. Helmkamp 2009-5-20 14759 Colusa Inner North Coast Ranges, along CA-16, 1.8 miles north of the Yolo County line 271 Comment
  RSA0056304  Eriodictyon californicum James R. Shevock 1971-4-8 938 Colusa Sites Lodge Rd., near Grapevine Pass. 426 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
  CAS-BOT-BC242579  Eriogonum dasyanthemum James L. Reveal 1988-6-2 6986 Colusa Walker Ridge Road along the Lake County line, 4.1 miles south of the Bartlett Springs Road and 3.2 miles south of the northern turnoff to Barrel Springs Campground, about 12.7 miles north of California Highway 20 990 Comment
  CDA15553  Eriogonum dasyanthemum G. F. Hrusa 1998-10-28 14904 Colusa North Coast Ranges; Summit of Walker Ridge. Comment
  CHSC112641  Eriogonum dasyanthemum Lowell Ahart 2013-10-1 19066 Colusa Inner North Coast Range. Near a small drainage, north of the wash and State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  CHSC77614  Eriogonum dasyanthemum Heidi West; Caroline Warren 1998-5-26 Colusa Vicinity of Antelope Valley, Huffmaster Road, and Sites. 167 Comment
  JEPS110262  Eriogonum dasyanthemum Lowell Ahart 2006-6-11 12680 Colusa On the east side of an off road trail (Trail 30), about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford 613 Comment
  RSA216788  Eriogonum dasyanthemum Robert F. Hoover 1968-5-27 11100 Colusa Bear Creek canyon N. of Highway 20 (near Wilbur Springs) Comment
  SEINET8043934 Image available Eriogonum dasyanthemum Ann Howald 2003-1 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
  UC1392809  Eriogonum dasyanthemum R. F. Hoover 1968-5-27 11100 Colusa n, Bear Creek Canyon Highway 20 (near Wilbur Springs); Bear Creek Canyon Comment
  UCD13221  Eriogonum dasyanthemum Charles Martin 1986-5-17 28 Colusa California: Colusa Co. Along Sites-Lodoga Rd, 8.2 mi W of Sites. Comment
  UCD63122  Eriogonum dasyanthemum Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4952 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
  UCD66538  Eriogonum dasyanthemum Craig D. Thomsen 2001-5-24 2498 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
  UCD66684  Eriogonum dasyanthemum Craig D. Thomsen 2000-5-11 2311 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
  CDA22487  Eriogonum dasyanthemum D. Brown 1973-10-19 Colusa Sand Creek, ca. 6 miles west of Arbuckle. 0 Comment
  CAS-BOT-BC250371  Eriogonum gracile Roxana Stinchfield 1916-6-18 307 Colusa Near College City Comment
  UC201699  Eriogonum hirtiflorum Volney Rattan June, 1884 Colusa above Stony Creek Comment
  UC1051504  Eriogonum hirtiflorum Helen K. Sharsmith 1953-6-19 4288 Colusa near Trough Springs (on Trough Springs Ridge); Inner North Coast Ranges, Mendocino National Forest, Trough 975 Comment
  CAS-BOT-BC259384  Eriogonum luteolum P. C. Everett; E. K. Balls 1954-10-17 20336 Colusa West slope Goat Mt., 0.9 mi. s.w. from Linger Longer campsite; road from Stonyford to Upper Lake 1828 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
  CDA11259  Eriogonum luteolum var. luteolum G. F. Hrusa 1994-11-7 11994 Colusa North Coast Biodiversity Arena; N side of Little Stony Creek. Approx. 2.5 miles above Stonyford-Lodoga Rd. on Goat Mtn. Rd. Comment
  UCR88380  Eriogonum luteolum var. luteolum Arthur M. Shapiro 1988-8-24 s.n. Colusa Mendocino National Forest, Near Glenn Co. line, at Goat Mtn Lookout, just below summit of Goat Mtn 1866 Comment
  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
  IRVC29687  Eriogonum nudum var. pubiflorum Mark A. Elvin, Mark S. Brunell, David Isle 2006-8-3 5031 Colusa Snow Mtn; Summit Spring Trail; 1.4km W of Snow Mtn West summit; 800m N of Cedar Camp. Southern Northern Inner Coast Ranges 1989 Comment
  UCR44921  Eriogonum tripodum L. F. LaPre 1986-5-30 s.n. Colusa 1.5 mi west of Mendocino National Forest Boundary on Stony Creek Rd [c. 4 mi. west of Stonyford] 671 Comment
  CAS-BOT-BC267860  Eriogonum umbellatum var. bahiiforme Milo S. Baker 1941-7-8 10113 Colusa Roadside between Stonyford and Lodoga Comment
  HSC41864  Eriophyllum lanatum K. Irwin 1977-4-24 300 Colusa Along Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  SEINET7096744  Eriophyllum lanatum 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
  CAS-BOT-BC308099  Eriophyllum lanatum var. achilleoides Roxana S. Ferris 1926-4-23 6453 Colusa Stonyford 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
  JEPS108812  Eriophyllum lanatum var. achilleoides Lowell Ahart 2006-6-11 12674 Colusa On the east side of an off road trail (Trail 30), about 50 yards south of Fouts Road, about 5 miles (by road) west of Stonyford 613 Comment
  JEPS75857  Eriophyllum lanatum var. achilleoides L. R. Heckard 1974-9-10 3893 Colusa along upper reaches of Dark Hollow Creek (s of East Peak); Snow Mt., Dark Hollow Creek 2042 Comment
  UC1484434  Eriophyllum lanatum var. achilleoides Dale E. Johnson with J. E. Eckenwalder 1974-6-2 128 Colusa On ridge connecting East and West peaks of Snow Mt. 1999 Comment
  UC195369  Eriophyllum lanatum var. achilleoides A. A. Heller 1916-6-6 12353 Colusa on grade about 3 mi w Leesville; Coast Range Comment
  RSA302654  Eriophyllum lanatum var. achilleoides Jim Shevock 1971-4-8 939 Colusa Sites-Lodoga Road 427 Comment
  UC1718073  Eriophyllum lanatum var. achilleoides John S. Mooring 1968-5-24 2066 Colusa Road from Leesville to Bartlett Springs, at lake-Colusa line Comment
  UCD70241  Eriophyllum lanatum var. grandiflorum D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley. Destanella Flat-Walker Ridge. 450 Comment
  POM278144  Erodium botrys Lyman Benson 1933-4-16 4333 Colusa 5 miles south of Arbuckle, Sacramento River Watershed, Sacramento Valley. 91 Comment
  UC109465  Erodium brachycarpum Brandegee Apr 1889 Colusa Colusa Junction Comment
  UCD82123  Erodium cicutarium Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5651 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 839 Comment
  UC21016  Eryngium aristulatum var. aristulatum J. Burtt Davy 1898-5-1 4300 Colusa near Willows Comment
Read comments
Sep 15 2014
  CDA12013  Erysimum capitatum G. F. Hrusa 1990-4-8 7665 Colusa North Coast Biodiversity Arena; Road into Bear Valley from the S, passing Wilbur Springs, and originating at Hwy. 20. Comment
  CDA24852  Erysimum capitatum G. D. Barbe, T. C. Fuller 1986-3-6 4260 Colusa Leesville Grade west of Williams. 0 Comment
  UC1034721  Erysimum capitatum G. B. and R. P. Rossbach 1938-5-31 851 Colusa ravine slope about 18 mi w Williams Comment
  UCD163847  Erysimum capitatum Craig D. Thomsen 2000-5-30 2273 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  CAS-BOT-BC40754  Erysimum capitatum G. B. Rossbach; R. P. Rossbach 1938-5-31 851 Colusa About 18 miles west of Williams. Comment
  SEINET233343  Erysimum capitatum Kathleen R. Robson 1981-5-2 33 Colusa Mendocino National Forest ; Colusa co.: From Stonyford take Fouts Springs Road 12mi W past Fouts Springs to Letts Lake 1219 Comment
  RSA590193  Erysimum capitatum var. capitatum Michael A. Vincent, Robert M. Rhode 1996-3-30 7287 Colusa Along Bear Valley Rd. above Bear Creek, 0.6 mi. N jct. Wilbur Springs Rd. Comment
  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
  CHSC1751  Erythranthe bicolor L. Oliver 1935-5-3 Colusa Comment
  CHSC94638  Erythranthe nudata Lowell Ahart 2006-6-11 12663 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
  CAS-BOT-BC402663  Eschscholzia caespitosa Roxana S. Ferris 1926-4-23 6426 Colusa Summit of grade, Williams - Stonyford Road 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
  UCR233450  Eschscholzia caespitosa George K. Helmkamp, E. A. Helmkamp 2011-4-1 17124 Colusa Eastern Foothills North Coast Ranges, Antelope Valley, along Maxwell-Sites Road, 0.4 miles southeast of Sites 93 Comment
  CAS-BOT-BC5882  Eschscholzia caespitosa Townsend Stith Brandegee 1889-4-1 s.n. Colusa unspecified Comment
  RSA293185  Eschscholzia caespitosa subsp. caespitosa J. P. Smith, Tom Nelson, Jane Nelson 1978-4-2 9560 Colusa Bear Valley Road, 2.1 miles from its junction with State Route 20. 366 Comment
  JEPS51725  Eschscholzia californica Alice King June 1906 Colusa College City Comment
  UC630427  Eschscholzia californica Annetta Carter 1938-5-8 1392 Colusa 5.5 mi s Leesville (on Wilbur Springs rd); Inner North Coast Range, Bear Valley 426 Comment
  CAS-BOT-BC402975  Eschscholzia californica Roxana Stinchfield 1916-7-12 473 Colusa College City Comment
  CAS-BOT-BC5880  Eschscholzia caruifolia Mary Katherine (Mrs.) Brandegee 1889-4-1 s.n. Colusa Leesville Comment
  SDSU6059  Eucrypta chrysanthemifolia D. F Howe 1962-5-19 3284 Colusa 13 miles west of Williams on #2. 213 Comment
  CHSC9537  Euphorbia crenulata L. V. Ritter 1969-4-30 219 Colusa Ca 10 mi. sw of Williams, s side of Highway 20. 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
  UCD66704  Euphorbia crenulata Craig D. Thomsen 2001-4-12 2454 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UCD66937  Euphorbia serpillifolia Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5086 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
  CHSC70979  Euphorbia spathulata Vernon Oswald; Lowell Ahart 1998-5-7 9002 Colusa Bartlett Springs Rd. 2.1 mi west of Bear Valley Rd., 0.8 mi east of Sawtelle Valley and Grapevine Flat roads. 524 Comment
  CHSC79501  Euphorbia spathulata B. Castro; L. P. Janeway 2000-5-2 1110 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 234 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
  UCD61475  Extriplex joaquinana Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3896 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1/4 mile SW of parking lot. 399 Comment
  UCD82584  Extriplex joaquinana Craig Thomsen; J. Wiegand, S. Harrison, G. Harrington, A. Fulks 2008-6-12 2764 Colusa Walker Ridge, near Elgin Mine on Lucientes property. 655 Comment
  CHSC110865  Festuca arundinacea David Isle 1989-5-14 1997 Colusa Pendell Ranch ~2 miles W of Co. Rd. 306 Jct. w/ Fouts Springs Road; In black adobe soil ~150 yds south of Pendell home. 384 Comment
  CAS-BOT-BC63013  Frangula californica subsp. crassifolia A. A. Heller 1916-6-6 12360 Colusa Coast Range on the grade about 3 mi. w. of Leesville. Comment
  CAS-BOT-BC63016  Frangula californica subsp. crassifolia C. B. Wolf; B. D. Stark 1933-9-25 5506 Colusa Inner n. coast range, w. side of Bear Valley, near Mitchell Ranch House. Type Locality. 304 Comment
  CHSC107282  Frankenia salina L. P. Janeway; B. Castro 2011-7-9 10508 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 1.5 km southeast of Funks Reservoir and 0.1-0.6 km northeast of Tehama-Colusa Canal. 54 Comment
  POM135669  Frankenia salina Roxana Stinchfield 1916-6-17 282 Colusa At Tule, College City. Comment
  RSA123211  Frankenia salina H. S. Yates 1936-8-14 6135 Colusa 3 miles S. of Colusa 15 Comment
  UCD81898  Frankenia salina G. Harrington 2009-6-18 81 Colusa BLM Bear Creek (formerly Payne) Ranch. Lands to the SW of the junction of Hwys 16 and 20. S end of Cowboy Camp. E side of Bear Creek. 307 Comment
  HSC66135  Fraxinus dipetala Cathie Goldberg, Lynn Kunstman, Lauren Philbrick, Geoff Walsh 1980-4-19 47 Colusa On Bartlett Springs Rd. Comment
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Aug 13 2014
  UC1051743  Fraxinus dipetala Helen K. Sharsmith 1953-6-20 4299 Colusa Little Stoney Creek Inner North Coast Ranges, Mendocino National Forest 762 Comment
  CAS-BOT-BC223490  Fraxinus latifolia Roxana S. Ferris 1917-4-17 616 Colusa Sycamore Slough Comment
  CAS-BOT-BC383131  Fraxinus latifolia Andrew Townesmith; Karen M. Meyer 2007-8-7 911 Colusa Mendocino National Forest, Grindstone Ranger District. Big Spring Picnic area on Lett's Lake, off Forest Service road 17N02, 3.2 miles SW from intersection with Forest Service route M10 1371 Comment
  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
  CHSC26609  Fritillaria pluriflora D. W. Isle 1978-3-3 1501 Colusa Stonyford Cemetary Lane ca. 1.5 mi w of Stonyford, s of Fouts Springs Road. 365 Comment
  CHSC52363  Fritillaria pluriflora Henricus C. Jansen 1980-3-1 Colusa Along both sides of Lodoga-Leesville, 0.8 mi S of intersection with Stony(?) Sites Rd. 371 Comment
  JEPS100637  Fritillaria pluriflora Dean W. Taylor 1992-4-16 12400 Colusa East Park Reservoir, ca. 0.4 mi due W from spillway into Little Stony Creek Inner North Coast Range 411 Comment
  JEPS100638  Fritillaria pluriflora Dean W. Taylor 1992-3-18 13307 Colusa 1.6 mi S of Stonyford (on road to East Park Reservoir, on NE-facing slope W from the road) 365 Comment
Read comments
Jan 26 2011
  RSA297923  Fritillaria pluriflora W. Roderick 1968-3-10 s.n. Colusa On Hwy 20 (Williams-Clear Lake), 0.5 mile from Lake Co. Line Comment
  RSA481919  Fritillaria pluriflora Aaron Liston 1988-3-16 700 -1 Colusa Bear Valley 400 Comment
  UC1179069  Fritillaria pluriflora Herbert L. Mason 1947-3-30 13165 Colusa 0.5 mi e of Lake County Line (on Williams-Lower Lake Highway, western Colusa County); Williams-Lower Lake Highway Comment
  UCD139706  Fritillaria pluriflora RYB 1965-3-14 8387 Colusa Bear Valley Road, ca. 9-10 miles south of Leesville. Comment
  UCR261614  Fritillaria pluriflora Ann Howald 2003-3-11 2277 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, peninsula c. 2.2 miles north of Lodoga 365 Comment
  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
  CDA15495  Fritillaria recurva G. F. Hrusa, WTD 1998-6-19 14632 Colusa North Coast Ranges; N side of Goat Mtn. summit area. 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
  HSC86894  Galium andrewsii Rudy Galindo, Pat Daly 1988-4-16 50 Colusa 19.6 mi. off Hwy. 20 on Walker Ridge Rd. 762 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
  CDA42141  Galium andrewsii subsp. andrewsii T. C. Fuller 1958-5-27 Colusa South of Highway 20, 1 mile west of junction with Highway 16. 0 Comment
  HSC45711  Galium aparine Sheila Logan 1978-4-22 85 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  JEPS95487  Galium aparine Vernon H. Oswald and L. Ahart 1994-4-6 6062 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
  JEPS80054  Galium bifolium L. R. Heckard with J. Hickman 1979-6-15 5054 Colusa e trail from Frog Pond (cirque between e and w peaks); Snow Mt. 1981 Comment
  CHSC32201  Galium grayanum James Jokerst 1980-8-8 1079 Colusa North Coast Ranges. Near Snow Mountain (west). Comment
  JEPS24234  Galium grayanum var. nanum Peter H. Raven, R. Snow 1959-9-11 14411 Colusa s shoulder Snow Mountain 2042 Comment
  JEPS110109  Galium parisiense Lowell Ahart 2006-8-9 13149 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  UC1051748  Galium parisiense Helen K. Sharsmith 1953-6-18 4259 Colusa near Fouts Springs (above Mill Creek); Inner North Coast Ranges, Mendocino National Forest 609 Comment
  UCD56687  Galium porrigens Gordon Harrington 2007-3-25 6 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. 572 Comment
  UCD66527  Galium porrigens Craig D. Thomsen 2000-4-28 2228 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on north side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 2.80. Comment
  RSA15060  Galium porrigens Daniel Cleveland 1882-6-20 s.n. Colusa Allen Springs. Comment
  UCD163913  Galium porrigens var. porrigens Sara Martin 2016-4-9 5 Colusa BLM Bear Creek Ranch (Previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. Hill to the south of corral at junction of 16 and 20. 464 Comment
  UCD66572  Galium porrigens var. tenue Craig D. Thomsen 2001-5-24 2457 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
  CDA12374  Garrya congdonii G. F. Hrusa 1996-1-2 12627 Colusa Inner North Coast Ranges; N side of Little Stony Creek, about 2 miles W of intersection of Cedar Camp Rd. and Stonyford-Lodoga Rd. Comment
  SBBG34146  Garrya congdonii R. D. Slayback 1959-3-20 2 Colusa near St Hwy 16, 6 mi NW of Rumsey Comment
  UCD121091  Garrya congdonii G. F. Hrusa 1996-2-26 12632 Colusa Above Little Stony Creek, on Goat Mtn. Rd. approx 2.5 miles SE of Stonyford-Lodoga Rd. Inner North Coast Ranges. 475 Comment
  UCD121095  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
  CHSC94472  Gastridium phleoides Lowell Ahart 2006-8-9 13171 A Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS76800  Gayophytum heterozygum L. R. Heckard 1974-9-9 3854 Colusa near Foutch Camp; Snow Mt. 1889 Comment
  JEPS80183  Gayophytum humile L. R. Heckard with J. Hickman 1980-7-3 5335 Colusa just w Summit Springs (sw Snow Mt., ca 10 mi w of Stonyford, Colusa-Lake County boundary); Snow Mt. 1548 Comment
  JEPS81279  Geranium carolinianum L. R. Heckard and J. C. Hickman 1982-7-5 5890 Colusa s of (slope below) Summit Springs (s side of Snow Mt.); Snow Mt. 1500 Comment
  UCD64432  Gilia capitata Craig D. Thomsen 2000-5-11 2323 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  RSA0014386  Gilia capitata Joan Stewart 1998-6-10 757 Colusa Bear Valley Comment
  UC1613303  Gilia capitata Charles M. Belshaw April, 1937 2870 Colusa Inner North Coast Range. Vicinity of Cook's Spring, Devil's Ridge. Comment
  HSC45794  Gilia tricolor J. P. Smith, Thomas W. Nelson 1976-4-14 8581 Colusa Mendocino National Forest, confluence of Stony Creek and N Fork of Stony Creek. 427 Comment
  RSA293157  Gilia tricolor J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9563 Colusa Bear Valley Road, 2.1 miles from its junction with State Route 20. 366 Comment
  RSA469705  Gilia tricolor Michelle Stevens 1979-4-14 18 Colusa Buck Flat on Walker Ridge Road. 884 Comment
  RSA590190  Gilia tricolor Michael A. Vincent, Robert M. Rhode 1996-3-30 7283 Colusa Along Bear Valley Rd. above Bear Creek, 1.4 mi. S jct. Wilbur Springs Rd. Comment
  UCD82484  Gilia tricolor Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5671 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
  HSC72769  Gilia tricolor J. Krajanowski 1981-4-4 4 Colusa .3 mi. W of junction of Hwy. 20 and Hwy. 16, S side of Bear Creek, 18 mi. SW of Williams 322 Comment
  UC106686 Image available Gilia tricolor subsp. tricolor T. S. Brandegee April 1889 Colusa Colusa Junction Comment
  UC719300  Gilia tricolor subsp. tricolor F. G. Meyer 1938-4-5 1356 Colusa about 10 mi w Williams; w of Williams Comment
  HSC85881  Gilia tricolor subsp. tricolor Jon Schroeder 1975-4-26 27 Colusa Bear Valley Rd., 9.7 mi. N of Hwy. 20 Comment
  JEPS86605  Githopsis diffusa subsp. robusta L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-19 6714 Colusa 0.5 mi ne Summit Springs (sw flank of Snow Mountain, Colusa-Lake County line); Snow Mountain 1640 Comment
  UC71621  Githopsis specularioides Miss Alice King 1905-1 Colusa College City Comment
  CHSC113040  Glinus lotoides Lowell Ahart 2013-10-1 19074 Colusa Inner North Coast Range. Strand of East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  UC1191378  Glinus lotoides Herbert L. Mason 1945-7-11 12641 Colusa 3 mi above Colusa (near Butte Creek, Butte Lodge Outing Club); Butte Lodge Outing Club Comment
  UCD67068  Glyceria Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5096 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
  RSA725016  Gnaphalium luteoalbum L. Ahart 2006-8-9 13125 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
  JEPS110101  Gnaphalium palustre Lowell Ahart 2006-8-9 13124 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  UCD66861  Gnaphalium palustre Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5064 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
  POM53845  Grindelia camporum Roxana Stinchfield 1916-6-17 283 Colusa Near Tule - College City. Comment
  CHSC50794  Grindelia camporum var. camporum Vernon Oswald 1990-7-30 4410 Colusa Maxwell-Colusa Rd just east of Two Mile Rd, ca. 2 mi east of Maxwell. Between road and irrigation ditch. 27 Comment
  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
  JEPS113894  Grindelia hirsutula L. P. Janeway 2007-6-17 9058 Colusa Inner North Coast Ranges; Along Bartlett Springs Road between Bear Valley and Walker Ridge Road. 530 Comment
  UCD82539  Grindelia hirsutula Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5692 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
  RSA0016943  Grindelia hirsutula var. davyi C. B. Wolf 1928-5-8 2126 Colusa 3 miles S of Arbuckle, Pacific Hwy. Comment
  UCD66996  Gutierrezia californica Gordon Harrington 2008-8-14 79 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
  UCD85147  Hainardia cylindrica Beecher Crampton 1958-5-19 4795 Colusa 10.1 miles southeast of Leesville, foothill area. Comment
  CAS-BOT-BC230059  Harmonia hallii Ellen Dean; G. Harrington; K. Mawdsley; J. Shepard 2010-5-1 5966 Colusa Walker Ridge on border of Lake and Colusa Counties. Along Walker Ridge Rd., just E of Barrel Springs area 721 Comment
  JEPS94768  Harmonia hallii Vernon Oswald and Lowell Ahart 1998-5-7 9012 Colusa Bartlett Springs Road 2.8 mi w of Bear Valley Road (0.1 mi e of Sawtelle Valley and Grapevine Flat Roads); Bartlett Springs Road 633 Comment
  UCD135766  Harmonia hallii Bruce G. Baldwin 1986-4-13 599 Colusa 2.6 miles west of junction with Bear Valley Road along Bartlett Springs Road. Comment
  UCD82590  Harmonia hallii Craig D. Thomsen; J. Wiegand, S. Harrison, G. Harrington, A. Fulks 2008-4-22 2735 Colusa Walker Ridge. About 3.2 mi N of Hwy 20, adjacent to abandoned road leading back to Walker Ridge Rd. from 'Oak Cove. 822 Comment
  JEPS80276  Hazardia whitneyi var. discoidea L. R. Heckard and J. Hickman 1980-9-16 5462 Colusa n slope West Peak; Snow Mt., West Peak 2042 Comment
  CHSC112644  Helianthus bolanderi Lowell Ahart 2013-10-1 19071 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
  SEINET4008331 Image available Helianthus bolanderi A. Carter 1951-1 3079 Colusa Serpentine hills at west side of Bear Valley, southwest of Leesville. 450 Comment
  UCD72399  Heliotropium curassavicum Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5124 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Confluence of Cache and Bear Creeks at southern tip of ranch. 198 Comment
  CHSC113041  Heliotropium curassavicum var. oculatum Lowell Ahart 2013-10-1 19096 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
  POM64436  Heliotropium curassavicum var. oculatum Roxana Stinchfield 1916-6-17 281 Colusa Near Tule College City. Comment
  CDA20053  Heliotropium europaeum D. Brown 2002-10-4 PDR 019525 Colusa Northern California; Vicinity of Colusa 0 Comment
  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
  JEPS104401  Helminthotheca echioides Lowell Ahart 2003-10-23 10661 Colusa Along Squaw Creek, just south of East Park Reservoir, ca 1/8 mi nw of Sites Lodoga Rd, ca 1 mi n of Lodoga, ca 21 mi w of Maxwell. 368 Comment
  CAS-BOT-BC306027  Hemizonia congesta subsp. clevelandii A. A. Heller 1916-6-6 12358 Colusa Coast Range on the grade about 3 miles west of Leesville Comment
  UC195406  Hemizonia congesta subsp. clevelandii A. A. Heller 1916-6-6 12358 Colusa 3 mi w Leesville (on the grade); Coast Range Comment
  SEINET10797452  Hemizonia congesta subsp. clevelandii Katherine L. Morris, Melvin L. Conrad; David B. Dunn 1973-6-6 Morris 382 Colusa Chaparral woodland and sparse oaks; on Hwy. 20, 0.3 mi. E of Lake County line. Comment
  UCD55445  Hemizonia congesta subsp. luzulifolia Ellen Dean; Gordon Harrington 2006-10-6 3270 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 374 Comment
  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
  CAS-BOT-BC309736  Hemizonia congesta subsp. luzulifolia Bruce G. Baldwin 1985-6-1 477 Colusa 0.7 mile north of California State Highway 20 on Bear Valley Road Comment
  UCR281726  Hemizonia congesta subsp. tracyi David Isle, Frank Pendell 2014-6-16 2136 Colusa North Coast Range, c. 2 miles west of Stonyford on the Pendell Ranch, southeast of the home of Frank and Sheri Pendell c. 0.25 mile and northwest of the Stonyford Cemetary, c. 200 yards 384 Comment
  UCD70224  Hemizonia luzulifolia D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. Annual grasslands growing on ultramafic soils. 370 Comment
  SEINET10758258  Hemizonia parryi subsp. parryi Andrew Townesmith, Karen M. Meyer 2007-8-7 Townesmith 909 Colusa Mendocino National Forest, Grindstone Ranger District. Vicinity of Mill Creek Campground/Davis Flat OHV staging area. Off Forest Service route M10, 8.2 miles west of intersection with Lodoga-Stonyford road in Stonyford. T18N R7W, near edge between sections 4 and 5. 499 Comment
  HSC103568  Hemizonia pungens Thomas W. Nelson, Jane Nelson 1983-8-13 7596 Colusa At rest stop just south of Maxwell Comment
  JEPS75707  Heracleum lanatum Alice Q. Howard 1972-7-10 10 Colusa stream crossing trail between Fouts Camp and Box Springs (lower of 2 wet places along trail on n. side of ridge separating Trout & Paradise Creeks, Snow Mt.); Snow Mt. 1600 Comment
  CHSC76742  Hesperevax caulescens J. Marr; H. West, C. Warren 1998-4-14 Colusa NW of town of Sites, vicinity of Grapevine and Stone Corral Creeks. 158 Comment
  UC88271  Hesperevax caulescens B. 1889-1-1 Colusa Colusa Comment
  SD40656  Hesperocyparis sargentii Carl B. Wolf, E. R. Johnson 1934-10-15 Colusa Cook Springs (western part of county) 550 Comment
  JEPS94735  Hesperolinon californicum Vernon H. Oswald and Lowell Ahart 1998-7-15 9269 Colusa Bartlett Springs Road 1.6 mi w of Bear Valley Road; Bartlett Springs Road 487 Comment
  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
  UCD66457  Hesperolinon californicum Craig D. Thomsen 2000-6-7 2362 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  UC1552829  Hesperolinon californicum Frederica Bowcutt 1985-5-5 511 Colusa nw Wilbur Springs; Big Valley Shale Barrens 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
  RSA700361  Hesperolinon disjunctum L. P. Janeway 2001-6-6 7128 Colusa Deadshot Spring, about 1.9 km (air) east of Walker Ridge Road. 716 Comment
  UC1212470  Hesperolinon disjunctum Helen K. Sharsmith 1959-5-27 4692 Colusa hillslope just beyond Candy Bucket Springs (4 mi beyond Mill Creek on road to Stonyford); Inner North Coast Ranges 853 Comment
  UC1212515  Hesperolinon disjunctum Herbert L. Mason 1952-6-19 14301 Colusa slope between Fouts Springs Red Bridge Public Camp; Inner North Coast Ranges, Mendocino National Forest Comment
  UC1601227  Hesperolinon disjunctum Helen K. Sharsmith 1959-5-27 4693 a Colusa Cook Springs Inner North Coast Ranges 548 Comment
  UCD67005  Hesperolinon disjunctum Craig D. Thomsen 2008-5-23 2741 Colusa BLM Payne Ranch. Lands to the SW of Hwy 16/20 intersection. About 0.75 mile south of Hwy 20 (south of Destanella Flat), 2.5 miles west of Hwy 16. 520 Comment
  UCD67057  Hesperolinon disjunctum Craig D. Thomsen 2008-5-23 2752 Colusa BLM Payne Ranch. Lands to the SW of Hwy 16/20 intersection. About 1 mile south of Hwy 20 (south of Destanella Flat), 2.5 miles west of Hwy 16. 470 Comment
  UCD82139  Hesperolinon disjunctum Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5679 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
  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
  UCR71414  Hesperolinon disjunctum H. K. Sharsmith 1965-6-23 5529 Colusa Inner North Coast Ranges, c. 1/4 mi. east of Cook Springs 534 Comment
  CAS-BOT-BC176220  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
  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
  RSA151803  Hesperolinon disjunctum H. K. Sharsmith 1951-7-13 4031 Colusa Fouts Springs, near Mill Creek at junction with road to Black Diamond Ridge, Mendocino National Forest. 457 Comment
  RSA262575  Hesperolinon disjunctum Marilyn Ivey 1973-5-19 55 Colusa 1.5 miles up Wilbur Springs Road north off of State Highway 20. Comment
  SD51665  Hesperolinon disjunctum Helen K. Sharsmith 1953-6-18 4254 Colusa 1.0 mile beyond Wolf Glade on spusr road, drainage of Stoney Creek, Mendocino National Forest. 609 Comment
  UC1212479  Hesperolinon disjunctum Helen K. Sharsmith 1959-5-27 4693 Colusa 1 mi below Cook Springs; Inner North Coast Ranges 518 Comment
  UC1212304  Hesperolinon drymarioides Helen K. Sharsmith 1952-6-21 4159 Colusa n canyon slope overlooking Cook Springs; Inner North Coast Ranges 548 Comment
  UC1212306  Hesperolinon drymarioides Freed W. Hoffman 1947-6-19 1616 Colusa serpentine slope on n side canyon directly adjacent to Cook Springs (at end of road, ca five mi sw of Ladoga by road); Inner North Coast Ranges Comment
  UC1509752  Hesperolinon drymarioides C. M. Rogers 1969-6-21 13265 Colusa near Cooks Springs Comment
  RSA0049696  Heteranthera dubia Dean Wm. Taylor 2014-5-18 21476 Colusa 3.5 miles southwest of Maxwell; eastern bank of the Glenn-Colusa Canal downstream of the crossing of Fairview Road 36 Comment
  SBBG115923  Heteranthera dubia R. Yeo -Oct-1976 Colusa 3 mi N of Williams, Glenn-Colusa Canal irrigation district Comment
  JEPS75717  Heterocodon rariflorum L. R. Heckard 1974-9-9 3843 Colusa just se Foutch Camp (Snow Mt.); Snow Mt. 1889 Comment
  UC2042506  Heteromeles arbutifolia Holly Forbes and Barbara Keller 2011-7-7 Colusa Walker Ridge Rd, 6.1 miles N from its intersection with Hwy 20 Comment
  UCD72451  Heteromeles arbutifolia Ellen Dean; Gordon Harrington 2006-11-10 3312 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western part of ranch, along ridge trail above Cache Creek. 535 Comment
  JEPS73775  Heuchera micrantha var. pacifica L. R. Heckard 1972-7-10 3126 Colusa 3 mi nw Fouts Springs (on se corner of Snow Mt.); Snow Mt 1828 Comment
  UC931960  Hibiscus lasiocarpos Verne Grant and Alva Grant 1946-8-6 7837 Colusa 1 mi. n. of Butte Outing Gun Club near Colusa (Butte Creek); Butte Creek Comment
  CHSC25319  Hibiscus lasiocarpos var. occidentalis Hayes; Warner, Schlising 1977-8-23 49 Colusa Along Putnam Rd., where this road reaches the Butte Creek Drainage, off of Gridley road 5. 50 Comment
  UCD123736  Hippuris vulgaris J. M. Tucker; L. K. Mann 1959-5-30 3528 Colusa Mill Valley, ca. 1/4 mile northwest of Lower Letts Valley, and ca. 4 miles, airline, north of Goat Mountain Lookout. 1219 Comment
  UCD72479  Hirschfeldia incana Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3813 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. West side of Bear Creek, across from BLM parking lot that is located at south end of bridge. 249 Comment
  CAS-BOT-BC320321  Holocarpha virgata A. A. Heller 1940-6-7 15721 Colusa Near the foot of the grade east of Lodogo on the Sites road Comment
  CAS-BOT-BC320319  Holocarpha virgata H. M. Hall 1930-9-25 12893 Colusa About 4 miles south of Arbuckle 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
  RSA0118629  Holocarpha virgata subsp. virgata Lowell A. Ahart 2013-10-1 19099 Colusa Near strand of East Park Reservoir, about 2 miles (air) southeast of Stonyford, about 3 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 375 Comment
  UC1563895  Holocarpha virgata subsp. virgata Barbara Ertter with Elizabeth Neese, Laura Fujii, and Dawn Espindola 1989-10-21 8875 Colusa near East Park Road from Stonyford (nw side of East Park Reservoir); East Park Reservoir 365 Comment
  UC725605  Holocarpha virgata subsp. virgata A. A. Heller 1940-6-7 15721 Colusa road to Sites; Lodogo Comment
  RSA28813  Holodiscus discolor A. A. Heller 1916-6-6 12362 Colusa Coast Range on the grade 3 miles W of Leesville. Comment
  IRVC29690  Holodiscus microphyllus var. glabrescens Mark A. Elvin, Mark S. Brunell, David Isle 2006-8-3 5028 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
  POM163516  Hordeum Roxana S. Ferris 1926-4-22 6300 Colusa 2 miles west of Colusa Comment
  CHSC110864  Hordeum brachyantherum David Isle 1989-5-14 1995 Colusa Stony Creek Watershed. Pendell Ranch ~2 miles W of Co. Rd. 306 Jct. w/ Fouts Springs Road; ~150 yds south of Pendell home. 384 Comment
  UCD61443  Hordeum brachyantherum Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3888 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek.Approximately 1000 ft NW of parking lot. 339 Comment
  UCD70230  Hordeum brachyantherum D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. Perennial plant communities close to serpentine temporal vernal pools. 370 Comment
  UCD82472  Hordeum brachyantherum Craig Thomsen; G. Harrington 2009-5-12 2848 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  JEPS121772  Hordeum brachyantherum David Isle 1989-5-14 1995 Colusa COLUSA County, CA. Pendell Ranch ~ 2 miles W of Co. Rd. 306 Jct. w/ Fouts Springs Road. Comment
  CAS-BOT-BC284988  Hordeum depressum Roxana S. Ferris 1917-4-12 518 Colusa 4 miles east of Williams Comment
  CHSC112265  Hordeum depressum Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18637 Colusa Inner North Coast Range. North side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  JEPS120993  Hordeum depressum Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18637 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
  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
  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
  JEPS118652  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. Comment
  POM197357  Hordeum marinum subsp. gussoneanum Le Roy Abrams 1928-5-8 12593 Colusa 2 miles south of Arbuckle Comment
  SEINET3271561 Image available Hordeum murinum George K. Helmkamp, E. A. Helmkamp 2009-3-11 14371 Colusa Inner North Coast Range Foothills; along CA-20, 14.3 miles southwest of Williams 375 Comment
  CAS-BOT-BC284750  Hordeum murinum subsp. glaucum Roxana S. Ferris 1917-4-12 515 Colusa 4 miles East of Williams Comment
  UCD57281  Hordeum murinum subsp. glaucum Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3649 Colusa BLM Payne Ranch. Mouth of Craig Canyon. Along unimproved road, about 2 road miles south of junction of Hwy 20 and Hwy 16. . 316 Comment
  CHSC83698  Hordeum murinum subsp. leporinum L. P. Janeway 2002-4-24 7521 Colusa Sacramento Valley/Inner North Coast Ranges border. Vicinity of Logan Ridge, Stone Corral Creek, and Funks Creek. 103 Comment
  CHSC83693  Hordeum vulgare L. P. Janeway 2002-4-24 7522 Colusa Sacramento Valley/Inner North Coast Ranges border. Vicinity of Logan Ridge, Stone Corral Creek, and Funks Creek. 103 Comment
  JEPS88739  Horkelia californica subsp. dissita Dean W. Taylor 1992-6-10 12696 Colusa Highway 162-Alder Springs Road ca 2 mi w from junction with Grindstone Road (Inner North Coast Ranges); Inner North Coast Ranges 1371 Comment
  JEPS93802  Horkelia californica var. elata Vernon H. Oswald and Lowell Ahart 1998-7-15 9270 Colusa Bartlett Springs Road 1.6 mi west of Bear Valley Road 487 Comment
  CHSC62925  Hornungia procumbens Vernon H. Oswald; Lowell Ahart 1994-4-6 6075 Colusa Goat Mtn. Rd. 0.3 mi S of Little Stony Creek Bridge, SW of Digger Pine Flat, SSW of Stonyford. Along a drainage. 548 Comment
  UCD106062  Hosackia crassifolia Freed W. Hoffman 1948-6-27 2515 Colusa Upper Letts Valley, 8.6 miles south of Fouts Springs, western part of county. Comment
  UCD146730  Hosackia crassifolia var. crassifolia G. F. Hrusa 1998-6-19 14617 Colusa North Coast Ranges. Along USFS Pacific Ridge Road. (M5) Above intersection with Goat Mountain Road. 1120 Comment
  UCD110369  Hypericum perforatum subsp. perforatum Jack Booth 1973-6-14 s.n. Colusa State Highway 20, 2 miles west of junction with State Highway 16. Comment
  CHSC105470  Hypochaeris glabra Richard R. Halse 2007-3-25 7122 Colusa Along State Hwy. 20 ca. 7.8 miles northeast of its junction with State Hwy. 16, at base of Salt Canyon. 100 Comment
  HSC48199  Hypochaeris glabra Thomas W. Nelson, Jane P. Nelson 1978-4-29 3957 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  SEINET11259792 Image available Hypochaeris glabra R. 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
  CHSC71008  Iris macrosiphon Vernon Oswald; Lowell Ahart 1998-5-7 9008 Colusa Bartlett Springs Rd. 2.2 mi west of Bear Valley Rd., 0.7 mi east of Sawtelle Valley and Grapevine Flat roads. 524 Comment
  RSA256676  Iris macrosiphon Maralyn O'Meara, Gary S. Lester 1974-5-4 342 Colusa Walker Ridge Road, ca. 0.7 mile from junction with Little Indian Valley Road 854 Comment
  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
  UCD57305  Iva axillaris Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3676 Colusa BLM Payne Ranch. Lands to the southwest of junction of Hwy. 20 and Hwy. 16. Thompson Canyon, near juncture with Craig Canyon. 362 Comment
  JEPS80386  Juncus L. R. Heckard, and J. Hickman 1981-6-22 5619 Colusa Dark Hollow Creek Snow Mt. 1889 Comment
  UCR212366  Juncus balticus Craig D. Thomsen 2000-4-28 2178 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
  CHSC107947  Juncus balticus subsp. ater B. Castro; Amy Lyons 2011-2-9 1830 A Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 5 air mi NW of Maxwell, 0.8 mi southeast of Funks Reservoir and 400 ft northeast of Tehama-Colusa Canal. Large +- saline/alkaline wetland/ seasonal marsh. Western of the two Juncus patches at the south edge of the marsh. 49 Comment
  CHSC86963  Juncus bufonius var. congestus B. Castro; Michelle Cedarborg 2003-5-1 1425 Colusa Vicinity of Logan Ridge, Sites Peak and Lurline Creek. In wet mud just downstream of pond at creek headwaters. 205 Comment
  JEPS80259  Juncus covillei L. R. Heckard and J. Hickman 1980-9-15 5439 Colusa n of road at Summit Springs (Snow Mountain, Lake-Colusa County Boundary); Snow Mountain, Summit Springs 1524 Comment
  CHSC94441  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
  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
  JEPS75719  Juncus ensifolius L. R. Heckard 1974-9-9 3850 Colusa just se Foutch Camp; Snow Mt. 1889 Comment
  JEPS73444  Juncus howellii L. R. Heckard 1972-7-8 3039 Colusa ridge running se of Snow Mt., West Peak 2011 Comment
  JEPS80285  Juncus howellii L. R. Heckard, and J. Hickman 1980-9-16 5459 Colusa ne slope West Peak (cirque area between peaks); Snow Mt. 2011 Comment
  JEPS80257  Juncus occidentalis L. R. Heckard, and J. Hickman 1980-9-15 5435 Colusa n of Summit Springs (n side of road); Snow Mt. 1524 Comment
  CHSC79616  Juncus patens L. P. Janeway 2000-5-31 6777 Colusa Inner North Coast Ranges. At Candy Bucket Springs, on the south side of canyon of Stony Creek. 628 Comment
  UCD82439  Juncus patens Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5665 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 869 Comment
  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
  CHSC97128  Juncus usitatus Lowell Ahart 2007-7-7 14258 Colusa South of the wire fence, on the south side of the Gridley Colusa Highway, about 1 1/4 miles east of River Road, about 17 miles west of Gridley. 20 Comment
  HSC100768  Juncus usitatus Lowell Ahart 2007-7-7 14258 Colusa S side of the Gridley-Colusa Hwy., ~1 1/4 mi. E of River Rd. and 17 mi. W of Gridley. 20 Comment
  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
  UCD63130  Juncus xiphioides Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4960 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Meadow to the east of Destinella Flat, ca. 3 rd miles west of the junction with Hwy 16 on the south side of Hwy 20. 526 Comment
  UCR280794  Juncus xiphioides var. xiphioides David Isle 2014-6-7 2133 Colusa North Coast Range, c. 1 mile south of Stonyford, David and Rhonda Isle property. West bank of Salt Creek, just north of second curve north of bridge on Dennis Drive 366 Comment
  CHSC79433  Juniperus californica B. Castro; L. P. Janeway 2000-5-1 1102 Colusa Vicinity of Sites, hills S of the Sites-Lodoga Rd, and Grapevine Creek. 204 Comment
  CHSC81201  Juniperus californica L. P. Janeway; B. Castro 2001-4-12 7017 Colusa Vicinity of Grapevine Creek, Funks Creek, and Antelope Valley. 158 Comment
  POM163455  Juniperus californica Roxana S. Ferris 1926-4-23 6456 Colusa 4 miles from [south of] Stonyford on the Leesville Road Comment
  UC1221795  Juniperus californica Beecher Crampton 1958-5-19 4804 Colusa 1.3 mi s of Lodoga Comment
  UCD163315  Juniperus californica Craig D. Thomsen 1997-4-13 1904 Colusa Bear Valley. About 6 miles north of Hwy 20. Vicinity of Trout Creek, north of Deadshot Canyon. 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
  CHSC94282  Keckiella corymbosa Lowell Ahart 2006-8-9 13102 Colusa On the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 422 Comment
  JEPS110095  Kickxia elatine Lowell Ahart 2006-8-9 13134 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  UC637057  Kickxia elatine Edward Lee 1934-8-9 1011 Colusa 4 mi n Willows; Sacramento Valley Comment
  CHSC107962  Koeleria phleoides B. Castro; Robin Carter, Jessica Boyt 2011-4-25 1851 Colusa Sacramento Valley. Extreme W edge of Sacramento Valley; 5 air mi NW of Maxwell, 1 mi southeast of Funks Reservoir and 170 ft northeast of Tehama-Colusa Canal. Ca 0.15 mi S of large +- saline/alkaline wetland/marsh, on dry grassy hillside just downslope from canal. 59 Comment
  UCD82476  Lactuca Craig Thomsen; G. Harrington 2009-5-12 2854 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  RSA746963  Lactuca serriola George K. Helmkamp, E. A. Helmkamp 2008-10-14 14244 Colusa Sacramento Valley: along CA-20, 0.2 mile east of the Sutter County Line 9 Comment
  UC33049  Lactuca serriola J. Burtt Davy 1898-5-1 4275 Colusa near Willows Comment
  CHSC27635  Lagophylla minor Timothy Spira; Robert Schlising 1978-5-13 3240 Colusa Just E of Lake County line, along Hwy 20. 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
  UC638652  Lagophylla minor Ethel Crum 1938-5-8 2033 Colusa 3 mi n Leesville; Inner North Coast Range Comment
  UCD66601  Lagophylla minor Craig D. Thomsen 2000-5-11 2276 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UCR227339  Lagophylla minor Craig D. Thomsen 2000-5-11 2303 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
  JEPS38990  Lagophylla minor W. L. Jepson 1938-6-9 18959 Colusa mts. betw. Indian Valley (Lake Co.) and Bear Valley (Colusa Co.) 579 Comment
  CAS-BOT-BC341472  Lagophylla ramosissima Roxana Stinchfield 1916-6-22 313 Colusa College City Comment
  POM50993  Lagophylla ramosissima Roxana Stinchfield 1916-6-22 313 Colusa College City. Comment
  UCR238928  Lamium amplexicaule George K. Helmkamp, E. A. Helmkamp 2012-2-9 18533 Colusa Sacramento Valley, River Road, 7.1 miles north of Colusa; east side of Sacramento River 18 Comment
  CHSC77734  Lasthenia californica B. Castro 1999-4-12 Colusa About 9 air miles NW of Maxwell, vicinity of Peterson Rd and Logan Ridge. 100 Comment
  UCD163305  Lasthenia californica Craig D. Thomsen 1997-4-7 1896 Colusa Bear Valley. About 5 miles north of Hwy 20. 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-BC353480  Lasthenia fremontii A. A. Heller 1921-4-10 13546 Colusa Near Colusa Comment
  CAS-BOT-BC353481  Lasthenia fremontii Roxana S. Ferris 1917-4-12 531 Colusa 4 miles E of Williams Comment
  UCR47942  Lasthenia glaberrima J. M. Tucker 1978-5-6 4408 Colusa W side of Ber Valley Rd., 11 mi north of jct with State Hwy 20 396 Comment
  CHSC27622  Lasthenia glabrata Timothy Spira; Robert Schlising 1978-5-13 3250 Colusa Bear Valley, about 5 mi S of Leesville, on Bear Valley (=Wilber Springs) Road. Comment
  HSC90077  Lasthenia glabrata C. Baldwin, A. Hiss, P. Reynolds 1990-4-14 45 Colusa 100 m off Bear Valley Rd., 1.2 mi. S of junction with Walker Ridge Rd. 409 Comment
  CAS-BOT-BC328109  Lasthenia glabrata subsp. coulteri Roxana S. Ferris 1917-4-12 503 Colusa 4 miles E of Williams Comment
  JEPS35399  Lasthenia glabrata subsp. glabrata W. L. Jepson 1932-5-8 16283 Colusa Stonyford 365 Comment
  RSA293117  Lasthenia glabrata subsp. glabrata J. P. Smith, Jane P. Nelson, Thomas W. Nelson 1978-4-2 9529 Colusa Bear Valley Road, 5 miles from its junction with State Route 20. 390 Comment
  POM914476  Lasthenia glabrata subsp. glabrata L. S. Rose 1936-4-27 36184 Colusa 15 miles NW of Rumsey. 305 Comment
  JEPS74813  Lasthenia gracilis L. R. Heckard, T. I. Chuang, and R. Bacigalupi 1975-5-7 4021 Colusa just sw of site old Kowalski ranch ((below upper dam road), sw of Leesville); Upper Indian Valley 396 Comment
  UC71630  Lasthenia gracilis Miss Alice King 1905-1-1 Colusa College City Comment
  JEPS9958  Lasthenia platycarpha W. I. Follett 1935-3-31 23 Colusa 1.7 mi s Williams (from a point on the main highway) Comment
  UCD81710  Lathyrus jepsonii var. californicus Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5716 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones Spring area on W side of road, ca. 6.5 road mi N of junction with Hwy 20. W side of road. 833 Comment
  HSC95475  Lathyrus vestitus subsp. vestitus A. Skelly, B. Bletcher, G. McCabe 1996-3-30 10 Colusa 1.6 mi. W of Bear Valley Rd. and Brim Rd. on Brim Rd., 14.7 mi. on Walker Ridge Rd. to Brim Rd., 57 mi. E of Hwy. 101 on Hwy. 20, Leesville Comment
  CHSC62933  Lathyrus vestitus var. vestitus Vernon H. Oswald; Lowell Ahart 1994-4-6 6070 Colusa Goat Mtn. Rd. 0.3 mi S of Sullivan Creek Bridge, SW of Digger Pine Flat, S of Stonyford. 487 Comment
  CAS-BOT-BC323887  Layia chrysanthemoides Alice Eastwood 1922-4-24 11191 Colusa Road between Princeton & Norman. Comment
  CDA11406  Layia chrysanthemoides G. F. Hrusa, K. van Katwyk 1995-4-22 12127 Colusa Inner North Coast Ranges; Bear Valley, 15 m. N of Hwy. 20. Comment
  UC89163  Layia chrysanthemoides K. Brandegee Apr 1889 Colusa Leesville Comment
  UCD162975  Layia chrysanthemoides Jack Major 1963-5-4 s.n. Colusa Bear Valley. (Exact location unknown. Coordinates estimated by label maker.) 396 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
  HSC90060  Layia fremontii C. Baldwin, A. Hiss, P. Reynolds 1990-4-15 51 Colusa Bear Valley 409 Comment
  CHSC27623  Layia platyglossa Timothy Spira; Robert Schlising 1978-5-13 3249 Colusa Bear Valley, about 5 mi S of Leesville, on Bear Valley (= Wilber Springs) Road. Field. Comment
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May 24 2013
  CHSC65801  Layia platyglossa L. P. Janeway; B. Castro, Linnea Hanson, Beth Corbin, Kim Earl 1995-4-28 4761 Colusa Southern end of Bear Valley just west of where the road crosses Bear Creek. 396 Comment
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May 24 2013
  HSC85935  Layia platyglossa Michalski, Hopson, Raum 1987-4-12 62 Colusa Bear Valley Comment
  JEPS39673  Layia platyglossa Rimo Bacigalupi, T. Crovello, and L. Heckard 1965-4-26 9044 Colusa 5.5 mi n of Wilbur Springs turnoff; Tout Creek, Bear valley 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
  HSC85783  Layia platyglossa Bobbi Schnell, Leonel Arguello, Andrea Begnoche 1987-4-12 35 Colusa Off to the side of the Road in Bear Valley Comment
  SEINET11447842 Image available Layia platyglossa M. J. Williams 1967-5-7 s.n. Colusa Bear Valley 396 Comment
  CAS-BOT-BC329325  Layia septentrionalis R. F. Hoover 1938-4-23 3206 Colusa Grade on Rumsey--Arbuckle Road (both sides of summit) 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
  JEPS13436  Layia septentrionalis R. F. Hoover 1938-4-24 3213 Colusa Upper Sand Creek Comment
  RSA60887  Layia septentrionalis Frank W. Gould 1938-4-22 282 Colusa Head of Capay Valley, west of Arbuckle. Comment
  UCR261621  Layia septentrionalis Ann Howald 2003-3-25 2284 Colusa Inner North Coast Ranges, Indian Valley, west side of East Park Reservoir, near dam, west of Little Stony Creek 355 Comment
  UCR261678  Layia septentrionalis Ann Howald 2003-4-24 2315 Colusa Inner North Coast Ranges, Indian Valley, west side of East Park Reservoir, west side Little Stony Creek, opposite the dam 350 Comment
  UCR261679  Layia septentrionalis Ann Howald 2003-4-24 2316 Colusa Inner North Coast Ranges, Indian Valley, west side of East Park Reservoir, south side of road to spillway 367 Comment
  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-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
  CAS-BOT-BC527264  Lemna gibba A. A. Heller; H. E. Brown 1902-5-19 5571 Colusa Near Colusa Comment
  CHSC116673  Lemna minuta Lowell Ahart; John Dittes, Josephine Guardino 2016-2-14 20723 Colusa Small pond on the east side of the graveel road, about 1/2 mile north of Letts Lake, about 1/2 mile south of the large campground, about 13 miles (air) southwest of Stonyford. 966 Comment
  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
  CAS-BOT-BC534910  Lemna turionifera Verne Grant; Herbert L. Mason 1946-8-6 12966 Colusa Pond on Colusa-Marysville Highway, four miles south of Colusa, west side Sacramento River Comment
  HSC72170  Lepidium lasiocarpum J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9542 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  SEINET2033409 Image available Lepidium latifolium George K. Helmkamp, E. A. Helmkamp 2008-1 14257 Colusa Sacramento Valley; along River Road (generally following the Sacramento River), 1.1 miles north of Colusa (Meridian 7.5' Q.: 39 deg. 13'33''N, 121 deg. 59'43''W, +/- 1000m). 18 Comment
  POM143190  Lepidium latipes Roxana S. Ferris 1917-4-12 532 Colusa 4 miles east of Williams. Comment
  CHSC52006  Lepidium nitidum Camille M. Corda 1982-4-12 17 Colusa Ca. 0.3 mi w of jct of Hwys 20 and 16, s side of Bear Creek, 100 ft from n side of Hwy 20, ca. 18 mi sw of Williams. 321 Comment
  CHSC86962  Lepidium strictum B. Castro 2003-4-10 1424 Colusa Vicinity of Logan Ridge, Sulphur Gap and Lurline Creek. In bed of dirt road near confluence of small creeks, on west edge of Sacramento Valley. 85 Comment
  UC596488  Leptochloa fascicularis R. F. Hoover 1936-7-31 1590 Colusa Maxwell Comment
  CAS-BOT-BC273929  Leptochloa fusca subsp. fascicularis James Moffett 1928-10-1 s.n. Colusa 5 miles north of Colusa Comment
  RSA424704B  Leptosiphon bicolor Aaron Liston, M. A. Blumler 1987-4-26 667 -6 Colusa Bear Valley - Lodoga Road, 6.6 miles S of Bartlett Springs Jct. Comment
  UCD163206  Leptosiphon bicolor Craig D. Thomsen 2000-3-31 2048 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 0.3 mile west of Hwy 20/16 intersection. 345 Comment
  UCD64434  Leptosiphon bicolor Craig D. Thomsen 2001-4-12 2460 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  CHSC79791  Leptosiphon bolanderi L. P. Janeway; B. Castro 2000-5-4 6706 Colusa Vicinity of Grapevine Creek and Sites-Lodoga Road. 262 Comment
  CHSC25156  Leptosiphon ciliatus J. D. Sagray 1970-4-4 4 Colusa 15 mi w of Williams at the junction of Hwy 20 and 16. 350 Comment
  CHSC86028  Leptosiphon ciliatus Jenny Marr; H. West, J. Lacey, C. Warren, N. Wight 1998-4-14 Colusa Vicinity of Grapevine Creek, Antelope Valley, and Sites-Lodoga Road. 121 Comment
  UCR261753  Leptosiphon ciliatus Ann Howald 2003-5-29 2348 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3.6 miles north of Lodoga, 0.1 mi south of Chisolm Cove Group Campground 385 Comment
  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
  CHSC19694  Leptosiphon parviflorus L. A. Wright Jr. 1971-3-27 10 Colusa Ca. 7 mi w of Williams on Hwy 20, off the s side of the road about 150 ft, in a meadow next to a stream. 91 Comment
  UCR261672  Leptosiphon pygmaeus subsp. continentalis Ann Howald 2003-3-26 2294 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3.1 miles north of Lodoga, near shore of reservoir 370 Comment
  CHSC91040  Lesquerella occidentalis subsp. occidentalis D. Isle 2003-6-24 376 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. On Colusa/Lake County line, 1/8 mi. SE of Goat Mt. Lookout. 1841 Comment
  UCD70252  Lessingia micradenia D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley. Destanella Flat-Walker Ridge. 450 Comment
  POM51466  Lessingia nemaclada Katherine Brandegee 1889-04 s.n. Colusa Leesville 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
  UCD66691  Lessingia nemaclada Craig D. Thomsen 2000-6-23 2372 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UCR227341  Lessingia nemaclada Craig D. Thomsen 2000-6-23 2400 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
  CAS-BOT-BC341802  Lessingia nemaclada Walter Knight; Irja Knight 1963-9-23 113 Colusa Between Leesville and Wilbur Springs Comment
  RSA134705  Lessingia nemaclada P. H. Raven, R. Snow 1959-9-11 14425 Colusa About 2 miles south-east of Happy Camp 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
  CHSC88557  Lessingia ramulosa L. P. Janeway 2001-6-6 7126 Colusa Inner North Coast Ranges. Deadshot Spring; about 1.9 km (air) east of Walker Ridge Road. 716 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
  UC2014145  Lessingia ramulosa Ellen Dean, C. Thomsen, T. Hansen, windfarm meeting 2010-6-11 6145 Colusa Colusa County. Walker Ridge. Along Walker Ridge Road, N of turnoff to Indian Valley Reservoir but S of Til Jones Spring. Many old undeveloped roads here. Comment
  UCD55454  Lessingia ramulosa Ellen Dean; Gordon Harrington 2006-10-6 3278 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 374 Comment
  UCD134101  Lessingia ramulosa Vernon H. Oswald; Lowell Ahart 1998-7-15 9276 Colusa west side of county on Sawtelle Valley Road 0.4 mile north of Bartlett Springs Road. 670 Comment
  UC1146611  Leymus triticoides Freed W. Hoffman 1944-7-14 1954 Colusa Wilbur Springs North Coast Ranges Comment
  UC38247  Leymus triticoides J. Burtt Davy May, 1898 4290 Colusa near Princeton Comment
  UCD164157  Leymus triticoides Craig Thomsen 2008-4-7 2424 Colusa Between Bear Creek and Bear Valley Rd. about 0.3 mile north of junction with Hwy 20. Comment
  JEPS75708  Lilium pardalinum Alice Q. Howard 1972-7-10 11 Colusa along trail between Fouts Camp and Box Springs (on n side of ridge separating Trout Creek and Paradise Creek); Snow Mountain 1600 Comment
  CHSC75651  Lilium pardalinum subsp. pardalinum Vernon H. Oswald; Lowell Ahart 1999-6-22 9789 Colusa 2.2 mi west of Stonyford-Lodoga Road on County Road 42 paralleling Little Stony Creek. 426 Comment
  JEPS96000  Lilium pardalinum subsp. pardalinum Vernon H. Oswald and L. Ahart 1999-6-22 9789 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 426 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
  UCD33941  Limnanthes douglasii subsp. nivea Beecher Crampton 1958-4-21 9173 Colusa Colusa County, 4 miles N.W. of Lodoga by road. Comment
  UCD82495  Linanthus Craig Thomsen; G. Harrington 2009-5-12 2845 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  IRVC29626  Linanthus Mark A. Elvin, Mark S. Brunell, David Isle 2006-8-3 5023 Colusa Snow Mtn; Summit Spring Trail; 1.4km W of Snow Mtn West summit; 800m N of Cedar Camp. Southern Northern Inner Coast Ranges 1989 Comment
  JEPS58265  Linanthus bolanderi W. L. Jepson 1932-5-8 16269 Colusa Lodoga, w Colusa Co. Lodoga 457 Comment
  UC971715  Linanthus bolanderi Herbert L. Mason 1941-4-5 12404 Colusa 3 mi s Stonyford Comment
  UC73621  Linanthus ciliatus Miss Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  UCD33940  Linanthus dichotomus Beecher Crampton 1958-4-21 9172 Colusa 4 miles NW of Lodoga (by road). Comment
  JEPS94194  Linanthus parviflorus Vernon Oswald and Lowell Ahart 1998-5-7 9006 .1 Colusa Bartlett Springs Rd. 2.1 mi. w. of Bear Valley Rd. and 0.8 m,i. e. of Sawtelle Valley & Grapevine Flat rds. 524 Comment
  JEPS39670  Linanthus parviflorus Rimo Bacigalupi, and T. Crovello, and L. Heckard 1965-4-26 9047 Colusa 2.5 mi from Ladoga junction (at summit w of Bear Valley on road to Bartlett Springs, Colusa-Lake County boundary) 670 Comment
  UCD163884  Lithophragma affine Craig D. Thomsen 2002-4-10 2596 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 0.75 mile west of Hwy 20/16 instersection. Comment
  CDA34090  Lithophragma affine P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  UC71648  Lithophragma bolanderi Miss Alice King 1905-1 Colusa College City Comment
  CHSC79454  Logfia filaginoides B. Castro; L. P. Janeway 2000-5-2 1119 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 249 Comment
  UCD15294  Lomatium Claire Warshaw 1985-4-10 13 Colusa along Bear Valley Road, 4.5 miles northwest form intersection with Highway 20. 390 Comment
  UCD82548  Lomatium californicum Ellen Dean; G. Harrington, C. Thomsen,R. Wilmarth,Chiao-Yi Cheng 2009-5-20 5703 Colusa Walker Ridge. Along Walker Ridge just S of turn-off to picnic area near Cold Spring. 1007 Comment
  POM287962  Lomatium caruifolium Lyman Benson 1935-3-27 6342 Colusa Williams. 61 Comment
  SEINET13944350 Image available Lomatium ciliolatum Bonnie Prange 1974-1 sn Colusa Wilbur Springs Quad. Near Clyde Mine. Elev 2800 ft 853 Comment
  HSC60362  Lomatium ciliolatum var. hooveri Phyllis Krieg 1979-4-14 Colusa 1067 Comment
  UCR261661  Lomatium dasycarpum Ann Howald 2003-5-5 2330 Colusa Inner North Coast Ranges, Goat Mountain Road, c. 0.25 mile west of intersection with Lodoga-Stonyford Road 394 Comment
  LA90233  Lomatium hooveri Lincoln Constance; 1965-4-13 3756 Colusa Between Clear Lake Oaks and Williams, Highway 20, 2.7 mi. W of Highway 16 548 Comment
  UC1049547  Lomatium hooveri Rimo Bacigalupi 1950-4-16 3117 Colusa Bartlett Mt. Road, base of grade just W of Bear Valley, near Colusa-Lake County line 426 Comment
  UC765513  Lomatium hooveri R. F. Hoover 1941-5-2 4987 Colusa just e. Lake Co. line (on Williams-Clear Lake hwy.) 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
  UCD58105  Lomatium hooveri Ellen Dean; G. Harrington and P. McIntyre 2007-3-16 3352 Colusa Payne Ranch. Along Hwy. 20, just E of Lake Co. border. Ca. 3 road miles west of juncture with Hwy. 16, ca. 0.4 road mile east of Destanella Flat. South side of road. 556 Comment
  CDA33687  Lomatium macrocarpum P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  SEINET196147  Lomatium marginatum Robert F. Hoover 1941-5-2 4987 Colusa Just east of lake Coutny line on Williams Clear Lake highway Comment
  SEINET199389  Lomatium marginatum Rimo Bacigalupi, Arthur Holmgren 1950-4-26 3172 Colusa 'Grapevine Grade' to Lodoga 7.7 miles west of Sites Comment
  CHSC81211  Lomatium utriculatum Caroline Warren; Jenny Marr, Heidi West, Joyce Lacey-Rickert, Julie 1998-4-14 Colusa Vicinity of Grapevine Creek and Sites-Lodoga Road. 137 Comment
  JEPS17548  Lomatium utriculatum Alice King May, 1906 Colusa College City Comment
  UC1053478  Lomatium utriculatum Rimo Bacigalupi and Arthur Holmgren 1950-4-25 3177 Colusa 10 mi. n.w. Sites (Grapevine Grade to Lodoga) 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
  UCD56921  Lomatium utriculatum Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3524 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. In Craig Canyon. 334 Comment
  UCD56934  Lomatium utriculatum Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3536 Colusa BLM Payne Ranch. Southwest of intersection of Hwy 16 and Hwy 20. Thompson Canyon. 344 Comment
  UCD57818  Lomatium utriculatum Gordon Harrington 2007-4-17 30 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Destanella Flat, just south of Hwy 20, approximately 3.4 road miles west of the Hwy 16 intersection. 527 Comment
  UCD66539  Lonicera interrupta Craig D. Thomsen 2001-5-24 2516 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UCD70235  Lonicera interrupta D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. 450 Comment
  UCD67120  Lonicera involucrata Ellen Dean; Davis Botanical Society 2008-5-31 5053 Colusa west of I-5 at Maxwell, north slope of Goat Mountain, along Letts Valley Rd. between Goat Mountain Summit and Fouts Springs, east side of road. Comment
  JEPS80212  Lotus corniculatus L. R. Heckard and J. Hickman 1980-7-3 5366 Colusa sw slope Snow Mt. (about Summit Springs); , Summit Springs 1554 Comment
  UCR228657  Lotus crassifolius Ellen Dean, Davis Botanical Society 2008-5-31 5004 Colusa West of Hwy I-5 at Maxwell, east slope of Goat Mountain along Goat Mountain Road 1152 Comment
  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
  JEPS86626  Lotus denticulatus L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-19 6706 Colusa 0.5 km w Summit Springs (sw flank of Snow Mountain, Colusa-Lake County line); Snow Mountain 1500 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
  UC1423455  Lotus grandiflorus K. E. Bradshaw 1953-5 Colusa Lovelady Ridge Mendocino National Forest 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
  HSC72211  Lotus humistratus Thomas W. Nelson, Jane P. Nelson 1980-6-24 5879 Colusa Along road to Snow Mtn. trail head at Summit Springs 1585 Comment
  JEPS80180  Lotus humistratus L. R. Heckard with J. Hickman 1980-7-3 5332 Colusa just w Summit Springs (sw Snow Mt., ca 10 mi w of Stonyford, Colusa-Lake County boundary); Snow Mt. 1548 Comment
  POM163464  Lotus humistratus Roxana S. Ferris 1926-4-23 6417 Colusa At Mountain House on the Williams-Stonyford Road. Comment
  JEPS110105  Lotus purshianus var. purshianus Lowell Ahart 2006-8-9 13150 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  RSA746969  Lotus purshianus var. purshianus George K. Helmkamp, E. A. Helmkamp 2008-10-14 14242 Colusa along River Road (generally following the Sacramento River), 1.1 miles north of Colusa 18 Comment
  JEPS75753  Lotus purshianus var. purshianus L. R. Heckard, and R. Bacigalupi 1976-9-6 4434 Colusa just e Fout's Camp; Snow Mt. 1859 Comment
  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
Read comments
Aug 9 2017
  UC726672  Lupinus A. A. Heller 1940-4-21 15542 Colusa along U.S. Highway #99W, 2 mi s Williams Comment
  UCD66958  Lupinus adsurgens Ellen Dean; Davis Botanical Society 2008-5-31 5002 Colusa west of I-5 at Maxwell, east slope of Goat Mountain, along Goat Mountain Road. 1099 Comment
  UC71651  Lupinus affinis Miss Alice King 1905-1 Colusa College City Comment
  HSC89790  Lupinus albifrons L. Blackford, S. Branch, D. Malm 1988-4-16 71 Colusa 15.3 mi. off Hwy. 20 on Walker Ridge Rd. 915 Comment
Read comments
Aug 20 2014
  HSC91367  Lupinus albifrons A. Smith, A. Eller, B. Hoffman 1989-4-15 23 Colusa 3 mi. SW of Digger Pine Campground, on Goat Mtn. Rd. 152 Comment
  CAS-BOT-BC198400  Lupinus albifrons var. albifrons Mrs. H. C. Cantelow 1940-3-10 3832 Colusa W. of Williams Comment
  CAS-BOT-BC198401  Lupinus albifrons var. albifrons Mrs. H. C. Cantelow 1940-3-10 s.n. Colusa 11 miles west of Williams Comment
  HSC44466  Lupinus bicolor R. York 1978-4-22 138 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  SEINET5328111  Lupinus bicolor R. R. Halse 2002-3-21 6131 Colusa Williams; by junction 5th St. and B St. 24 Comment
  UCD163666  Lupinus bicolor Craig Thomsen 1999-4-15 1966 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCD64419  Lupinus bicolor Craig D. Thomsen 2000-4-12 2170 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  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
  SEINET10484945  Lupinus bicolor subsp. tridentatus Thomas W. Nelson, Jane P. Nelson 1978-4-29 Nelson 3938 Colusa Colusa co. T149,r5w,sec. 35; Elev. 1200'. Along bear valley rd. 2.5 Miles From junction with state route 20. Oak woodland. 366 Comment
  SEINET12164083  Lupinus densiflorus Unknown 1984-1 11 Colusa ca Salt Canyon, N side of Salt Crk, Hwy 20, 11miWSW of Williams. Wilbur Springs Quad 143 Comment
  HSC14822  Lupinus densiflorus var. aureus D. R. Junell 1965-4-18 29 Colusa 2 mi. E on Hwy. 16 from junction with Hwy. 20 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-BC8380  Lupinus formosus subsp. formosus Amos Arthur Heller 1940-4-21 15543 Colusa US Hwy 99W, 2 miles S of Williams Comment
  CAS-BOT-BC8485  Lupinus formosus var. robustus Amos Arthur Heller; H. E. Brown 1902-5-20 5573 Colusa Near College City Comment
  CAS-BOT-BC8379  Lupinus formosus var. robustus Amos Arthur Heller 1940-4-21 15543 Colusa US Hwy 99W, 2 miles S of Williams 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
  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
  UC1543161  Lupinus microcarpus var. densiflorus Charlotte G. Nast 1936-4-17 137 Colusa Williams to Lake Co. Road 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
  UCR206292  Lupinus microcarpus var. densiflorus George K. Helmkamp, E. A. Helmkamp 2009-5-20 14736 Colusa Central Inner Coast Ranges, along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 320 Comment
  JEPS108050  Lupinus microcarpus var. densiflorus Rhonda Riggins 1982-5-30 1448 Colusa Roadside Ladoga-Leesville Road, 4.4 mi N Leesville. 457 Comment
  OBI56805  Lupinus microcarpus var. densiflorus Rhonda Riggins 1982-5-30 1448 Colusa Roadside Ladoga-Leesville Rd, 4.4 mi N Leesville 457 Comment
  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
  SEINET12165154  Lupinus milo-bakeri Unknown 1985-1 50656 Colusa Bear Vly. W of Williams 404 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
  SEINET5320953  Lupinus nanus Unknown 2002-3-21 6129 Colusa Williams; By junction of 5th Street and B Street 20 Comment
  SEINET8056973  Lupinus nanus R. R. Halse 2002-3-21 6129 Colusa Williams, by junction of 5th Street and B Street. 24 Comment
  UCD33935  Lupinus nanus Beecher Crampton 1958-4-21 9166 Colusa 1 mile west of Lodoga. Comment
  HSC45690  Lupinus succulentus Patricia Shesgreen 1978-4-22 28 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  UCD56925  Lupinus succulentus Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3528 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Near headwaters of Craig Canyon. 359 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
  SEINET10489004  Lupinus succulentus Thomas W. Nelson, Jane P. Nelson 1978-4-2 Nelson 9550 Colusa Bear valley road, 1.3 mi from its jct with state route 20. Serpentine Chaparral with digger pine. 366 Comment
  RSA276282  Lupinus vallicola subsp. apricus Lyman D. Benson 1935-3-27 6333 Colusa 2 mi W of Williams. Inner N Coast mtn range, Sacramento River watershed. 122 Comment
  SEINET10490294  Lupinus vallicola subsp. apricus Thomas W. Nelson, Jane P. Nelson 1978-4-29 Nelson 3963 Colusa Along bear valley rd. 2.5 Mi from jct with state route 20. Oak woodland. 366 Comment
  RSA74314  Lycopus americanus Milo S. Baker 1946-9-5 11628 Colusa Along Hwy in water ditch betw Colusa & Williams. Comment
  CHSC47439  Lythrum californicum Lowell Ahart 1980-6-11 2371 Colusa On the east side of River Road, where the road dips and floods during high water, about 9 1/2 miles north of Colusa. 30 Comment
  CHSC78980  Lythrum californicum Vernon H. Oswald 2000-9-29 9973 Colusa Colusa National Wildlife Refuge. 13 Comment
  JEPS110112  Lythrum californicum Lowell Ahart 2006-8-9 13160 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  CHSC94454  Lythrum hyssopifolia Lowell Ahart 2006-8-9 13161 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UCD66929  Lythrum hyssopifolia Craig D. Thomsen; G. Harrington 2008-7-6 2773 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
  UCD67076  Lythrum hyssopifolia E. Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5101 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
  UCR225655  Lythrum hyssopifolia Craig D. Thomsen, Gordon Harrington 2008-7-6 2773 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 20 and 16. Western edge of ranch, near ridge trail that follows the border of Colusa/Lake Counties. Dunsfield Flat stock pond 610 Comment
  RSA0015853  Lythrum hyssopifolia Roxana Stinchfield 1916-6-17 286 Colusa At Tule levee, College City. Comment
  CDA34965  Lythrum tribracteatum Barbara Ertter, Elizabeth Neese, Laura Fujii, Dawn Espindola 1989-10-21 8870 Colusa Southeast end of East Park Reservoir, north of Lodoga. Comment
  OBI71983  Lythrum tribracteatum Barbara Ertter, Elizabeth Neese, Laura Fujii, Dawn Espindola 1989-10-21 8870 Colusa SE end of East Park Reservoir N of Lodoga 366 Comment
  SBBG122988  Lythrum tribracteatum B. Ertter et al. 1989-10-21 8870 Colusa SE end of East Park Reservoir, N of Lodoga 365 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
  JEPS4791  Madia elegans Rimo Bacigalupi with L. R. Heckard 1951-8-6 3472 Colusa 1 mi se Sites (in canyon near stone quarry) Comment
  JEPS80798  Madia elegans L. R. Heckard and J. C. Hickman 1981-7-30 5768 Colusa about 100 ft above on n side Trout Creek (se side of mountain); Snow Mt. 1554 Comment
  CHSC27631  Madia exigua Timothy Spira; Robert Schlising 1978-5-13 3239 Colusa Just E of Lake County line, along Hwy 20. Comment
  CHSC94677  Madia exigua Lowell Ahart 2006-6-11 12665 Colusa On the east side of an off road trail (Trail 30), about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford. 613 Comment
  UCD57855  Madia exigua Gordon Harrington; Diana Hickson, Jack Alderson 2007-4-29 43 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
  CHSC101633  Madia gracilis David W. Isle; Rhonda Isle, Ann Isle 2003-5-15 1631 Colusa About 6 miles W of Stonyford; N aspect of serpentine chaparral slope S of M-10 (18N01.2) and just W of OHV Trail 30 (18N78) jct. On 8 August 2001 Trough Fire burn site. MDB and M. 585 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
  UCD67039  Madia gracilis Ellen Dean; Davis Botanical Society 2008-5-31 5019 Colusa west of I-5 at Maxwell, Goat Mountain, ridge below summit off of Goat Mountain Road. 1734 Comment
  JEPS83808  Madia gracilis L. R. Heckard with J. Hickman 1980-7-1 5283 Colusa just above trail entrance to roadless area (above Summit Springs) (Summit Springs to Frog Lake, Colusa-Lake Co. boundary, ca. 10 mi w of Stonyford); Snow Mt. 1645 Comment
  SEINET7075568  Madia nutans A. G. Vestal 1955-4-5 s.n. Colusa In mountains [Cortina Ridge] west of Williams on Route 20 at Salt Canyon. 39? deg. 6' 22" North Latitude, -122? deg. 19' 15" West Longitude. UTM Zone 10, 558719mE, 4328566mN. (NAD 27)]. [Coordinate Datum: WGS84/NAD83]. Comment
  CAS-BOT-BC206317  Malacothamnus fremontii A. A. Heller 1940-6-7 15719 Colusa Wash below the road near the foot of the grade east of Lodogo on the Sites-Lodogo Road Comment
  UC725449  Malacothamnus fremontii A. A. Heller 1940-6-7 15719 Colusa below the road near the foot of the grade e Lodoga; Sites-Lodoga road Comment
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Sep 25 2006
  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
  UCD83450  Malacothrix clevelandii Craig Thomsen; G. Harrington 2009-5-12 2826 Colusa Colusa County on Walker Ridge: About 200 yards south of spur road enroute to Eaton Springs from Walker Ridge Rd. ( About 1/2 mile east of Walker Ridge Road) 822 Comment
  JEPS16207  Malacothrix floccifera Rimo Bacigalupi and Arthur Holmgren 1950-4-26 3185 Colusa just w Bear Valley (just w of base of the grade to Indian Valley (Bartlett Mt. Grade)); Inner North Coast Ranges Comment
  UC1053472  Malacothrix floccifera Rimo Bacigalupi and Arthur Holmgren 1950-4-26 3185 Colusa just w Bear Valley (just w of base of the grade to Indian Valley (Bartlett Mt. Road)); Inner North Coast Ranges Comment
  UC1212583  Malacothrix floccifera Francia Chisaki and Helen Sharsmith 1959-5-27 1336 Colusa 1.6 mi e Cooks Spring (on road to Cooks Spring); Inner North Coast Ranges Comment
  RSA669479  Malva parviflora R. R. Halse 2001-3-22 5945 Colusa Williams; along a vacant lot by 455-4th Street. 18 Comment
  JEPS113503  Malvella leprosa Lowell Ahart 2007-7-7 14261 Colusa On north side of the Gridley Colusa Highway, about 1 1/4 miles east of River Road, about 17 miles west of Gridley 20 Comment
  UCD169735  Marah fabacea Richard R. Halse 2014-3-25 9029 Colusa Along the Sites-Logoda Road ca. 4.7 miles northeast of Logoda; on the west end of Grapevine Pass. 527 Comment
  SEINET11990999  Marah oregana R. A. DeMartile 1983-1 106 Colusa Goat Mountain Rd 914 Comment
  CAS-BOT-BC361307  Marah watsonii Richard R. Halse 2013-3-26 8744 Colusa Along the Leesville-Logoda Road ca 5.5 miles S of Logoda, or 3.2 miles N of the junction of the Leesville and Bear Valley Roads; Indian Valley 426 Comment
  JEPS95245  Marah watsonii Steve Edwards 1996-4-26 Colusa Walker Ridge NE of Barrel Springs, on serpentinite scree visible immediately S of Brim Grade, E of Walker Ridge Road and not far below the latter in elevation Comment
  RSA0010481  Marah watsonii Richard R. Halse 2014-3-25 9031 Colusa Along the Sites-Logoda Road ca. 4.7 miles northeast of Logoda; on the west end of Grapevine Pass. 527 Comment
  SEINET8551368  Marah watsonii R. R. Halse 2014-3-25 9031 Colusa W end of Grapevine Pass, along the Sites-Logoda Road, ca 4.7 miles NE of Logoda. 527 Comment
  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
  UCR206379  Marrubium vulgare George K. Helmkamp, E. A. Helmkamp 2009-5-20 14757 Colusa Inner North Coast Ranges, along CA-16, 1.8 miles north of the Yolo County line 271 Comment
  UCD58123  Matricaria discoidea Ellen Dean; PLB 102 Class 2007-4-29 3719 Colusa Payne Ranch. West of Hwy. 16. Ca. 2 road miles S of junction of Hwy. 20 and Hwy. 16. Through Craig Canyon. Near 'Roadkill Cafe. 414 Comment
  UCD107748  Medicago lupulina Helen K. Sharsmith 1953-6-20 4298 Colusa Slopes of Little Stoney Creek, Mendocino National Forest. Inner north coast ranges. 762 Comment
  UCR233452  Medicago polymorpha George K. Helmkamp, E. A. Helmkamp 2011-4-1 17118 Colusa Eastern Foothills North Coast Ranges, Antelope Valley, along Maxwell-Sites Road, 1.8 miles southeast of Sites 77 Comment
  POM276582  Medicago polymorpha Lyman D. Benson 1933-4-16 4337 Colusa 5 miles south of Arbuckle, Sacramento River Watershed, Sacramento Valley. 91 Comment
  CHSC100246  Melica californica D. Isle 1988-4-13 1507 Colusa Mendocino National Forest - North Coast Ranges. Middle Fork Stony Creek Watershed. West of Fouts Springs youth facility; Approx. 1 mile west of current gate on Rd to Bathhouse Trail; East of road and E of Trout Ck Trailhead; Within fenced exclosure burned during 1987 Fouts Fire. 609 Comment
  CHSC112266  Melica californica Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18639 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
  UCD87699  Melica californica Beecher Crampton 1958-5-19 4817 Colusa West of Lodoga. Comment
  UCR119121  Melica californica Beecher Crampton 1958-4-21 4730 Colusa Inner North Coast Ranges, 7.8 miles northwest of Rumsey, along Highway 16, just above junction of Bear Creek with Cache Creek. 381 Comment
  SEINET11684249  Melica californica Unknown 1971-1 908 Colusa 3.3 mi N of Stony Ford on Elk Creek Road 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
  CHSC100265  Melica harfordii D. Isle 1988-4-13 1510 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
  CAS-BOT-BC247101  Melica torreyana Craig D. Thomsen; J. Wiegand; S. Harrison; G. Harrington; A. Fulks 2008-4-22 2732 Colusa Walker Ridge. Eaten Springs, 4 mi N of Hwy 20, ca. 1.5 mi E of Walker Ridge Rd. 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
  CHSC94465  Melilotus indicus Lowell Ahart 2006-8-9 13168 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS108889  Melilotus indicus Lowell Ahart 2006-8-9 13168 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  UCD66910  Melilotus indicus Craig D. Thomsen 2008-4-27 s.n. Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Saddle southwest of Cowboy Camp on the west side of Bear Creek. 365 Comment
  CDA16093  Melilotus officinalis G. F. Hrusa 1999-5-16 15050 Colusa North Coast Ranges; Little Stony Creek 457 Comment
  UCD107985  Melilotus officinalis G. F. Hrusa 1999-5-16 15050 Colusa Little Stony Creek. 457 Comment
  CHSC94289  Mentha canadensis Lowell Ahart 2006-8-9 13090 Colusa On the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  JEPS108913  Mentha canadensis Lowell Ahart 2006-8-9 13090 Colusa On the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford 455 Comment
  JEPS110099  Mentha canadensis Lowell Ahart 2006-8-9 13166 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  CHSC75615  Mentzelia dispersa Vernon H. Oswald; Lowell Ahart 1999-6-22 9778 Colusa Lily Pond near upper Letts Lake west of Stonyford. 1243 Comment
  UCD117224  Mentzelia dispersa G. Ledyard Stebbins Jr. 1964-7-4 6168 Colusa Northeast side of Mt. St. John, west of Stonyford. 1524 Comment
  CDA36623  Mentzelia laevicaulis R. Lawley Colusa Mendocino National Forest, Stonyford. 0 Comment
  UCD38806  Mentzelia micrantha Beecher Crampton 1958-5-19 4821 Colusa Colusa County, 6.3 miles northeast of Ladoga. Comment
  UCD163868  Micranthes californica Craig D. Thomsen 2001-4-12 2465 Colusa Bear Creek Canyon, first tributary above Sulphur Creek confluence with Bear Creek. About 3 miles north of Hwy 20. Comment
  POM174563  Micropus californicus Roxana S. Ferris 1926-4-23 6431 Colusa Near summit on grade. Williams- Stonyford Road Comment
  UCD163688  Micropus californicus Craig Thomsen 1999-4-15 1990 Colusa Bear Valley. About 5 miles north of Hwy 20, west of Bear Valley Rd. 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
  JEPS40619  Micropus californicus var. californicus W. L. Jepson 1932-5-7 16257 Colusa Valley above Venado Comment
  JEPS87665  Micropus californicus var. californicus Vernon H. Oswald and Lowell Ahart 1994-4-6 6067 B Colusa s. Stonyford (Goat Mt. Rd. at Sullivan Creek, 1.2 mi. s.w. of Digger Pine Flat); Sullivan Creek 469 Comment
  UCD82822  Micropus californicus var. californicus Craig Thomsen; G. Harrington 2009-5-12 2844 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  UC71639  Microseris campestris Miss Alice King 1905-1 Colusa College City Comment
  JEPS120972  Microseris douglasii Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18628 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
  CHSC114968  Microseris douglasii subsp. douglasii Lowell Ahart 2015-4-1 20001 Colusa Along Bear Valley Road, in Bear Valley, about 50 yards west of Bear Creek, about 6 miles south of Leesville, about 6 miles south of Highway 20. 395 Comment
  UC133492  Microseris douglasii subsp. douglasii Katharine Brandegee April 1889 Colusa Leesville Comment
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Aug 28 2012
  UCD57294  Microseris douglasii subsp. douglasii Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3665 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
  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
  UCD56919  Microseris douglasii subsp. tenella Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3522 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. In Craig Canyon. 334 Comment
  CHSC86599  Microseris elegans Jenny Marr; Heidi West, Joyce Lacey-Rickert, Caroline Warren 1998-5-8 Colusa Vicinity of Sites and Antelope Valley. 121 Comment
  UCR261654  Microseris paludosa Ann Howald 2003-4-24 2322 Colusa Inner North Coast Ranges, Indian Valley, west side of East Park Reservoir, near Pinto Point camping area 368 Comment
  UC638687  Microseris sylvatica Ethel Crum 1938-5-8 2032 Colusa 3 mi n Leesville 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
  UCD143422  Microsteris gracilis Oren Pollak 1987-4-10 s.n. Colusa Bear Valley. Comment
  UCD57339  Microsteris gracilis Robin Testa 2007-3-25 2 Colusa BLM Payne Ranch. Destinella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 560 Comment
  UCD64436  Microsteris gracilis Craig D. Thomsen 2000-3-31 2068 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  CHSC112646  Mimetanthe pilosa Lowell Ahart 2013-10-1 19072 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
  JEPS86644  Mimulus arvensis L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-19 6715 Colusa 0.5 mi w Summit Springs (sw flank of mountain); Snow Mountain, Colusa-Lake County line 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
  RSA535823  Mimulus douglasii David M. Thompson 1988-3-28 860 Colusa 2.0 mi W of Bear Valley Road along Bartlett Springs Road. 0.25 mi W of a road culvert for a small stream. 534 Comment
  RSA724956  Mimulus floribundus L. Ahart 2006-8-9 13151 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
  RSA0118612  Mimulus guttatus Lowell Ahart 2013-5-1 18688 Colusa Inner North Coast Range. North of the wash and State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  UCD82512  Mimulus guttatus Craig Thomsen; G. Harrington 2009-5-12 2870 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  UCD82574  Mimulus guttatus Craig Thomsen 2008-6-12 2765 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
  RSA114162  Mimulus layneae H. K. Sharsmith 1953-6-20 4290 Colusa 5 miles beyond Trough Springs on road to Goat Mountain, Mendocino National Forest. 1280 Comment
  SEINET7881836 Image available Mimulus layneae Helen K. Sharsmith 1953-6-20 4290 Colusa Mendocino Nat For ; In metamorphic rubble of forest clearing 5 mi beyond Trough Springs on rd to Goat Mt. 1280 Comment
  JEPS10504  Mimulus microphyllus W. L. Jepson 1932-5-7 16259 Colusa valley 1 mi above Venado 274 Comment
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Jun 15 2007
  UC71647  Mimulus microphyllus Miss Alice King 1905-1 Colusa College City Comment
  JEPS11151  Mimulus nudatus R. F. Hoover 1941-5-2 4982 Colusa just e Lake County line (on Williams-Clear Lake highway, about 6 mi s of Wilbur Springs) 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
  JEPS79794  Mimulus nudatus R. F. Hoover 1941-5-2 4982 Colusa just e Lake County line (on Williams-Clear Lake highway, about 6 mi s of Wilbur Springs); Williams-Clear Lake highway Comment
  RSA296392  Mimulus nudatus Robert F. Hoover 1941-5-2 4982 Colusa Just east (about 6 miles S of Wilbur Springs) of Lake Co. line on Williams-Clear Lake Hwy Comment
  UCD82576  Mimulus nudatus Craig Thomsen 2008-6-12 2766 Colusa Bear Creek (formerly Payne) Ranch. South side of Hwy 20, ca. 0.25 mi W of Hwy 16. West and SW of the corral that is located at the junction of Hwy 16 and 20. Comment
  RSA0118631  Mimulus pilosus Lowell A. Ahart 2013-10-1 19072 Colusa Strand of East Park Reservoir, about 2.5 miles (air) southeast of Stonyford, about 2.5 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 365 Comment
  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
  JEPS60201  Mimulus rattanii L. R. Heckard 1969-5-29 2237 Colusa about 6 1/2 air mi se Stonyford (along Trough Spring Ridge road, 0.2 mi n of its junction with Crackerbox Ridge road) 1127 Comment
  UCD81729  Mimulus rattanii Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5731 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones Spring area on W side of road, ca. 6.5 road mi N of junction with Hwy 20. W side of road. 864 Comment
  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
  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
  UCD82737  Minuartia douglasii Craig Thomsen; G. Harrington 2009-5-14 2918 Colusa Colusa County on Walker Ridge: south of spur road about 1/2 mile east of Walker Ridge Road, en route to Eaton Springs. 762 Comment
  POM256528  Minuartia douglasii Annetta Carter 1938-5-7 1377 Colusa Comanche Hills, 4 miles N of Rumsey, Inner North Coast Range. 259 Comment
  UCD15429  Minuartia douglasii Margit Sands 1985-4-13 33 Colusa in Bear Valley, 7.4 miles north of Wilbur Hot Springs rd., a quarter of a mile form the west side of the road; 396 Comment
  UC903048  Mirabilis greenei Ethel Crum 1932-5-8 1454 Colusa Stonyford North Coast Ranges (southern extension of ranges) 426 Comment
  UC637082  Mollugo verticillata Edward Lee 1934-8-9 1010 Colusa 4 mi n of willows (Sacramento Valley); Sacramento Valley Comment
  JEPS89251  Moluccella laevis Frank A. Leach 1919-1-1 Colusa w of Williams (Elbert Brim ranch) Comment
  UCD84445  Monardella Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6053 Colusa Walker Ridge. Along Walker Ridge Road, N of turnoff to Indian Valley Reservoir but S of Til Jones Spring. Many old undeveloped roads here. 817 Comment
  CHSC92639  Monardella odoratissima subsp. odoratissima D. Isle 2005-9-14 1174 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. Meadow west of Angel Spring, Snow Mountain Wilderness. 10S 0522348E 4358185N = Angel Springs. Comment
  CHSC48491  Monardella odoratissima subsp. pallida Vernon Oswald 1984-7-20 1611 Colusa Near the Lily Pond n of Letts Lake in the Mendocino National Forest. 1280 Comment
  CAS-BOT-BC220676  Monardella villosa A. A. Heller 1916-6-6 12355 Colusa Coast Range on the grade about 3 miles west of Leesville Comment
  CHSC106248  Monardella villosa B. Castro; L. P. Janeway 2001-6-3 1261 Colusa Inner North Coast Ranges. 'Til Jones Spring' at headwaters of Freshwater Branch of E. Fork Sulphur Ck, 0.6 mi E of top of Walker Ridge. Ca 3 air mi W of S end of Bear Valley, and 1.75 air mi SSE of Cold Spring Mtn. Just downslope from Walker Ridge Rd., in opening in surrounding serpentine chaparral. 822 Comment
  SEINET10582138  Monardella villosa A. Graff 1993-7-25 Graff 367 Colusa Bear Valley Rd., 2.2 miles north of Rte. 20, on right road cut. Locally infrequent on sandstone cliff, beneath Pinus coulteri, Quercus agrifolia, Arctostaphylos, sp. Past bloom. Comment
  IRVC29847  Monardella villosa subsp. villosa Mark A. Elvin, David Isle, Mark S. Brunell 2006-8-3 4991 Colusa Mendocino Nat. Forest; E face of Snow Mtn., Stony Creek along M10. Southern Northern Inner Coast Ranges 610 Comment
  JEPS108809  Monardella villosa subsp. villosa Lowell Ahart 2006-6-11 12672 Colusa On the east side of an off road trail (Trail 30), about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford 613 Comment
  SD241081  Monardella villosa subsp. villosa Mark A. Elvin, David Isle, Mark Brunell 2006-8-3 4991 Colusa Southern Northern Inner Coast Ranges: Mendocino Nat. Forest; E face of Snow Mountain, Stony Creek along M10. 609 Comment
  CAS-BOT-BC349575  Monolopia major Ethel Crum 1938-5-8 2035 Colusa Bear Valley, four miles south of Leesville 426 Comment
  UC1049535  Monolopia major Rimo Bacigalupi 1950-4-16 3118 Colusa just w Bear Valley (along base of grade (Bartlett Mt. road), near Colusa-Lake County line); Inner North Coast Ranges 426 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
  UCD50183  Muhlenbergia andina Craig D. Thomsen; Art Shapiro 2004-9-16 s. n. Colusa In large patch in roadcut along Goat Mountain Road, Colusa County. Comment
  JEPS15550  Muhlenbergia filiformis G. Thomas Robbins with L. R. Heckard 1956-7-25 3707 Colusa in meadow along trail due s Snow Mt. East (skirting eastern base of ridge forming Snow Mt. West) 1981 Comment
  CHSC29715  Muilla maritima K. R. Stern 1980-6-1 6642 Colusa South central border area of Colusa National Wildlife Refuge. 45 Comment
  UC719170  Muilla maritima F. G. Meyer 1938-4-5 1346 Colusa in meadow about 20 mi n Williams Comment
  CAS-BOT-BC83274  Myosurus minimus Herbert L. Mason 1953-4-5 14508 Colusa Three miles east of Maxwell. Comment
  CAS-BOT-BC83282  Myosurus minimus James Jokerst 1986-5-6 2299 Colusa Near Lurline Creek. 41 Comment
  UC1114806  Myosurus minimus Donald E. Stone Oct 26 1954-Sep 18 1955 7 -13 Colusa 3 mi e of city of Maxwell (on the Maxwell Road) Comment
  UC1738123  Myosurus minimus D. E. Stone 1955-5-2 7 -13 Colusa 3 mi E of Maxwell ( on Maxwell Rd.) Comment
  POM312444  Myosurus minimus var. filiformis H. L. Mason 1953-4-5 1459 Colusa 3 miles east of Maxwell Comment
  CHSC28129  Myosurus sessilis K. R. Stern 1979-5-5 Colusa Ca. 0.25 mi w of intersection of Hwy 20 and Int. Hwy 5. Vernal pool on n side of road, ca. 0.5 mi nw of Williams. 152 Comment
  UC1101348  Myosurus sessilis Herbert L. Mason 1953-4-5 14510 b Colusa 3 mi e of Maxwell Comment
  UCD96289  Myosurus sessilis H. L. Mason 1953-4-5 14508 Colusa Three miles east of Maxwell. Comment
  CHSC48457  Myriophyllum hippuroides Vernon Oswald 1984-7-20 1621 Colusa Letts Lake in Mendocino National Forest. 1402 Comment
  UCD67084  Najas gracillima Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5106 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western edge of ranch on ridge above Cache Creek Canyon. Spring-fed stock pond at base of uphill climb east side of ridge trail. 510 Comment
  UCR227337  Najas graminea Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5106 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20. Western edge of ranch on ridge above Cache Creek Canyon 511 Comment
  CAS-BOT-BC456162  Najas guadalupensis Herbert L. Mason; Verne Grant 1946-8-15 13008 Colusa Two miles west of Colusa on Williams highway by bridge Comment
  SEINET3237610  Najas guadalupensis subsp. guadalupensis Herbert L. Mason, Verne Grant 1946-9-5 13120 Colusa Road to Lake County, 1.6 miles west of Williams. Comment
  UCD138157  Najas guadalupensis subsp. guadalupensis Herbert L. Mason; Verne Grant 1946-8-15 13008 Colusa 2 miles west of Colusa on Williams highway by bridge. Comment
  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
  UCD63742  Nassella lepida Craig D. Thomsen 2008-5-23 2751 Colusa BLM Payne Ranch. Southwest of intersection of Hwy 16 and Hwy 20. About 1 mile south of Hwy 20 (south of Destanella Flat) and 2.5 miles west of Hwy 16. 420 Comment
  CHSC112917  Navarretia heterandra B. Castro; Robin Carter, Amy Lyons 2010-5-13 1808 Colusa Vicinity of Golden Gate in Logan Ridge, Road 69 and the Tehama-colusa canal, in disturbed, grazed annual grassland. 131 Comment
  JEPS80209  Navarretia intertexta L. R. Heckard and J. C. Hickman 1980-7-3 5363 Colusa Across road (north of) from Summit Springs, southwest slope of Snow Mt. 1548 Comment
  CAS-BOT-BC230316  Navarretia jepsonii Katharine Brandegee 1916-8-10 s.n. Colusa Bear Valley, near Eppersons Comment
  UC908621  Navarretia jepsonii Herbert L. Mason 1946-5-30 12814 Colusa about 1 mi e Lake County line (w Colusa County); Leesville Grade Comment
  UCD164150  Navarretia jepsonii Craig Thomsen 2000-5-12 2328 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  RSA537266  Navarretia leptalea P. H. Raven, Richard Snow 1959-9-11 14421 Colusa Openings in forest of Pinus ponderosa, Dark Hollow Creek. 1860 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
  CHSC86785  Navarretia leucocephala subsp. leucocephala Jenny Marr; Heidi West, Caroline Warren 1998-7-1 Colusa Vicinity of Sites, Golden Gate, Stone Corral Creek, and Funks Creek. 103 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
  UCR225393  Navarretia nigelliformis Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5082 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20. Northwestern part of ranch, along trail that follows the border of Lake and Colusa counties. South of junction with trail that heads down to the headwaters of Thompson Creek 429 Comment
  CHSC112918  Navarretia nigelliformis subsp. nigelliformis B. Castro; Robin Carter, Amy Lyons 2010-5-13 1807 Colusa Vicinity of Golden Gate in Logan Ridge, Road 69 and the Tehama-colusa canal, in disturbed, grazed annual grassland. 121 Comment
  CHSC89835  Navarretia nigelliformis subsp. nigelliformis B. Castro; L. Janeway 2001-5-10 1250 Colusa Vicinity of Grapevine Creek, Antelope Creek, and Pence Mtn. Near dirt road paralleling N-S-trending perennial creek. 381 Comment
  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
  UCR261750  Navarretia tagetina Ann Howald 2003-5-29 2349 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3.6 miles north of Lodoga, 0.1 mi south of Chisolm Cove Group Campground 385 Comment
  POM64859  Navarretia viscidula Roxana Stinchfield 1916-6-18 301 Colusa Timber near College City 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
  CHSC62937  Nemophila heterophylla Vernon H. Oswald; Lowell Ahart 1994-4-6 6058 Colusa Goat Mtn. Rd. 0.1 mi NE of Digger Pine Flat, S of Stonyford. Growing in gravelly soil of a roadside bank. 463 Comment
  CHSC77935  Nemophila heterophylla Beth Hendrickson; Heidi West 1999-3-23 Colusa Vicinity of Antelope Valley, Funks Creek, and Golden Gate. 137 Comment
  SEINET5585803  Nemophila heterophylla Richard R. Halse 2013-1 8738 Colusa Along the Leesville Road ca. 5.6 miles northwest of its junction with State Hwy. 20, west of Williams. 157 Comment
  UC72014  Nemophila heterophylla Miss M. Alice King 1905-1 Colusa near College City (Sacramento Valley); , near College City Comment
  CHSC110841  Nemophila heterophylla David Isle 1989-4-14 2010 Colusa Stony Creek Watershed. Charlotte Roush Ranch, S of Cook Springs Road. Comment
  RSA589947  Nemophila heterophylla Michael A. Vincent, Robert M. Rhode 1996-3-30 7272 Colusa Along St Hwy 16, near mile marker 6/65, a little N of the Yolo Co. line; 6.65 mi S jct St Hwy 20. Comment
  HSC87763  Nemophila menziesii Stephen Westergaard 1967-4-29 12 Colusa Bear Valley, 5 mi. N of Hwy. 20 91 Comment
  CHSC62938  Nemophila pedunculata Vernon H. Oswald; Lowell Ahart 1994-4-6 6076 Colusa Goat Mtn. Rd. 0.3 mi S of Little Stony Creek Bridge, SW of Digger Pine Flat, SSW of Stonyford. 548 Comment
  UC595048  Nemophila pedunculata Annetta Carter 1938-5-8 1381 Colusa 6.6 mi s Lodoga; s of Lodoga Comment
  UCD162986  Nemophila pedunculata Craig D. Thomsen 2002-4-4 2588 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
  RSA141313  Nemophila pedunculata J. M. Tucker, Theodore F. Niehaus 1960-4-3 3584 Colusa 9.1 miles above State Highway 20, Bear Valley (Wilbur Springs) Road. Comment
  CAS-BOT-BC231532  Nicotiana glauca J. H. Thomas 1960-8-29 8846 Colusa About 11 miles SW of Williams along highway 20 Comment
  CHSC62851  Nicotiana glauca Vernon H. Oswald; Lowell Ahart 1994-3-23 6024 Colusa Goat Mtn. Rd. 1.8 mi W of Stonyford-Lodoga Rd., S of Stonyford. Between the road and Little Stony Creek. 487 Comment
  JEPS87759  Nicotiana glauca Vernon H. Oswald and Lowell Ahart 1994-3-23 6024 Colusa 1.8 mi w Stonyford-Lodoga Rd. (Goat Mtn Rd, s of Stonyford, between the road and Little Stony Creek) 487 Comment
  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
  UC194932  Nicotiana quadrivalvis H. M. Hall 1916-6-16 10269 Colusa near Arbuckle (Colusa to Woodland) Comment
  CHSC101616  Nuttallanthus canadensis David W. Isle; Teal Richards 2002-4-18 1652 Colusa Mendocino National Forest. N of Fouts Springs, S of Chlorinator Building on road to Bathhouse Trail (Snow Mountain). SE aspect drainage in chamise chamassal site burned during 8/8/01 Trough Fire. Teal Richards-DI Reveg. Study Plot. MDB and M. 524 Comment
  UC71628  Nuttallanthus texanus Miss Alice King 1905-1 Colusa College City Comment
  UC1229784  Orobanche bulbosa G. Newcomb, F. Chisaki 1958-6-23 1165 Colusa North Coast Range, on John Smith Road John Smith Road; North Coast Range, John Smith Road Comment
  JEPS75712  Orobanche californica subsp. jepsonii L. R. Heckard 1974-9-9 Colusa Trail up from Summit Springs, Snow Mt. Comment
  UC71766 Image available Orobanche californica subsp. jepsonii H. P. Chandler Oct 1905 Colusa Princeton. Comment
  RSA0006070  Orobanche comosa H. P. Chandler 1905-10 s.n. Colusa Princeton Comment
  UCD84573  Orobanche fasciculata Ellen Dean; C. Thomsen, G. Harrington, Davis Botanical Society 2010-6-5 6098 Colusa Walker Ridge on border of Lake and Colusa counties. Just E of Barrel springs area along Walker Ridge Road. 721 Comment
  SEINET4854289  Orobanche grayana var. jepsonii H. P. Chandler s.n. Colusa Princeton. Comment
  CAS-BOT-BC238372  Orthocarpus Wayne Roderick 1967-5-7 s.n. Colusa Bear Valley 304 Comment
  RSA516500  Orthocarpus lithospermoides var. bicolor W. L. Jepson 1938-6-9 18964 Colusa Mts. between Indian Valley and Bear Valley. Btw. Lake Co. and Colusa Co. Comment
  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
  UCD34848  Oryza sativa Beecher Crampton 1963-9-9 6894 Colusa 1/4 mile E of Cortena. Comment
  CHSC75683  Packera clevelandii Vernon H. Oswald; Lowell Ahart 1999-6-22 9783 Colusa 1.5 mi west of Stonyford-Lodoga Road on County Road 42 paralleling Little Stony Creek. 359 Comment
  JEPS105741  Packera clevelandii David Gowen 2004-6-24 134 Colusa South of Stonyford. Approx. 1.8 miles along Goat Mt. Road from its junction with the paved road to Stonyford. 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
  UCD110512  Packera clevelandii Daniel Slakey; CNPS volunteers 2011-6-12 6 Colusa Walker Ridge. Wet meadow area on E side of Walker Ridge Rd. About 18 km N of Hwy.20 by road. 876 Comment
  UCD63126  Packera clevelandii Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4956 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
  JEPS118690  Packera eurycephala var. eurycephala David Isle 2011-5-8 1902 Colusa E of Isle home, concen. W of E fenceline. 2253 Dennis Dr, Stonyford in W 5 Ac of S 1/2 of NW 1/4 of SW 1/4 of SE 1/4. Gilmore Peak 7.5' quad. Comment
  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
  UCD88625  Parapholis incurva Beecher Crampton 1958-5-19 4825 A Colusa 4 miles south of Maxwell, along U.S. Highway 99W. Comment
  CDA11258  Parnassia californica G. F. Hrusa 1994-11-7 11993 Colusa North Coast Biodiversity Arena; Banks of Little Stony Creek, approx. 2.5 miles above Stonyford-Lodoga Rd. on Goat Mtn. Rd. Comment
  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
  CHSC94712  Paspalum distichum Lowell Ahart 2006-9-26 13352 Colusa Along the deep ditch, south side of the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell. 24 Comment
  POM198505  Paspalum distichum Roxana Stinchfield 1916-7-11 454 Colusa Williams Road-the 'Trough' Comment
  UCD88913  Paspalum distichum C. F. Dunshee 1942-1 2 Colusa Rice fields. Comment
  CHSC62921  Pectocarya pusilla Vernon H. Oswald; Lowell Ahart 1994-4-6 6071 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
  UC1177895  Pectocarya pusilla Peter M. Ray 1950-4-16 1738 Colusa 2 mi s Lodoga (on rd to Leesville) 381 Comment
  UCR261665  Pectocarya setosa Ann Howald 2003-5-5 2329 Colusa Inner North Coast Ranges, Goat Mountain Road, c. 0.25 mile west of intersection with Lodoga-Stonyford Road 394 Comment
  CHSC90083  Pedicularis densiflora Ross Rowland 2001-3-30 17 Colusa On hillside at the junction of Walker Ridge Road and Bear Valley Road. 545090mE/4334280mN/zone 10N. 663 Comment
  UCD165931  Pedicularis densiflora Ellen Dean; with Tom Starbuck 2016-4-24 8842 Colusa BLM Bear Creek Ranch (formerly Payne Ranch). Lands to the southwest of the intersection of Highway 16 and Highway 20. On north-facing slope of knoll that is just south of corral area (corral at junction of Highways 16 and 20). 398 Comment
  RSA401941B  Pedicularis densiflora Terry Roth 1979-4-14 9 Colusa [No location data on label] 1067 Comment
  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
  HSC94208  Pellaea andromedifolia D. Haskamp, E. Sonnenblick, M. Taft 1995-4-1 22 Colusa On Brim Rd. 1.6 mi. W of Jct. with Bear Valley Rd. 488 Comment
  RSA590198  Pellaea mucronata Michael A. Vincent, Robert Road 1996-3-30 7281 Colusa Along Bear Valley Road above Bear Creek, 1.4 miles south junction Wilber Springs Road. Comment
  CHSC86960  Pellaea mucronata var. mucronata B. Castro 2003-4-10 1423 Colusa Vicinity of Logan Ridge, Sulphur Gap and Lurline Creek. In E-trending small side canyon tributary. 146 Comment
  UC1212587  Penstemon heterophyllus Francia Chisaki, Helen K. Sharsmith 1959-5-26 1330 Colusa on road to Red Bridge Camp at North Fork of Stony Creek crossing; Inner North Coast Ranges, North Fork Stony Creek Comment
  UCR37571  Penstemon heterophyllus Michelle A. Strull, Et al. 1984-4-28 12 Colusa Brim Road 1.6 mi west of Leesville-Lodoga Jct. 419 Comment
  UCSB6183  Penstemon heterophyllus Keator, Glenn 1958-6-17 Colusa Near Bartlett Springs Comment
  HSC97535  Penstemon heterophyllus subsp. heterophyllus J. Carey, A. Hong, J. Leffingwell 1995-5-7 89 Colusa 2.25 mi. SE on Leesville-Williams Rd. from its junction with Bear Valley Rd. 396 Comment
  POM231095  Penstemon heterophyllus subsp. purdyi Jens Clausen 1935-5-20 1015 Colusa 18 mi W of Williams on Bartlett Springs Road. Past the Stonyford road. Comment
  CAS-BOT-BC240290  Penstemon heterophyllus var. purdyi Ellen Dean; G. Harrington; C. Thomsen; Chiao-Yi Cheng; R. Wilmarth 2009-5-20 5674 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road 853 Comment
  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
  CDA20255  Penstemon heterophyllus var. purdyi G. D. Barbe, Nola Parmer 1982-6-4 3636 B Colusa North Coast Ranges; Goat Mountain Rd, w of Lodoga-Stonyford Rd, Mendocino National Forest. 0 Comment
  UC76098  Penstemon heterophyllus var. purdyi Miss M. Alice King 1905-1 Colusa near College City (hills beyond Arbuckle); Sacramento Valley, near College City, Arbuckle Comment
  JEPS15552  Penstemon purpusii G. Thomas Robbins with L. R. Heckard 1956-7-25 3709 Colusa above Dark Hollow Creek (a trib. of Middle Fork Stony Creek, along trail due s of Snow Mt. East, at lower edge of cirque between Snow Mt. West and Snow Mt. East); Snow Mt. East, Dark Hollow Crk trib. Middle Fork Stony Creek 1981 Comment
  JEPS94162  Pentachaeta exilis Vernon Oswald and Lowell Ahart 1998-4-21 8947 Colusa bordering Goat Mt. Rd. 0.2 mi. s.w. of Stonyford-Lodoga Rd. 390 Comment
  CDA8447  Pentachaeta exilis N. van Kleeck, Willa May Lowary 1970-4-18 Colusa Bear Valley, just south of Ladoga. 0 Comment
  UCD56673  Pentagramma triangularis Jack Alderson 2007-3-25 9 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
  UCD82501  Perideridia kelloggii Craig Thomsen; G. Harrington 2009-5-12 2860 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  UCR261734  Perideridia kelloggii Ann Howald 2003-5-30 2357 A 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
  UCSB4567  Perideridia kelloggii Keator, Glenn 1958-6-16 Colusa Alogn road from Lower Lake to Sacramento valley just east of the Lake-Colusa county line Comment
  JEPS73489  Perideridia oregana L. R. Heckard 1972-7-9 3101 Colusa East Peak Snow Mt. (scree slope on se slope) 2011 Comment
  JEPS80375  Perideridia oregana L. R. Heckard and J. Hickman 1981-6-22 5608 Colusa East Peak Snow Mt. (s side of e ridge) 1950 Comment
  CHSC107483  Persicaria amphibia Jeanne Pendell 2010-7-17 1918 Colusa Mendocino National Forest - North Coast Ranges Middle Fork Stony Creek Watershed. East arm of East Park Reservoir, in the lake. 365 Comment
  CHSC84960  Persicaria amphibia Lowell Ahart 2003-10-23 10656 Colusa In 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
  CHSC61435  Persicaria punctata Vernon H. Oswald 1993-8-16 5807 Colusa Sacramento National Wildlife Refuge located ca. 7 mi S of Willows, W1/4 of Tract 44, near the S boundary of the refuge. Growing in shallow water on the N edge of Hunters Creek. 24 Comment
  UCD72534  Petrorhagia dubia Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3825 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
  JEPS73516  Phacelia corymbosa L. R. Heckard 1972-7-10 3134 Colusa w Trout Creek; Snow Mt. 1828 Comment
  UCR44932  Phacelia corymbosa L. F. LaPre 1986-5-30 s.n. Colusa Stony Creek Rd, 2.2 mi. west of Mendocino National Forest boundary, NE of Clear Lake 678 Comment
  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
  HSC35373  Phacelia distans Robert M. Specht 1975-5-4 169 Colusa 1/2 mi. NE of Fouts Springs along Stoney Creek 488 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
  RSA794842  Phacelia distans D. Isle 2008-4-9 1934 Colusa Reese Place Duck Club (4498 2 Mile Road); approx. 4 miles northeast of Maxwell. 30 Comment
  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
  RSA133612  Phacelia egena L. R. Heckard, C. Ritchie Bell 1951-6-14 176 Colusa Near Stonyford. 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
  UC1051762  Phacelia egena L. R. Heckard 1953-4-12 S- 136 Colusa University of California Botanical Garden Comment
  HSC45747  Phacelia heterophylla Stephen Plant 1978-4-22 205 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  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
  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
  CHSC60747  Phacelia imbricata subsp. imbricata Vernon H. Oswald; Lowell Ahart 1993-5-27 5430 Colusa Sites-Lodoga Rd. ca. 0.4 mi W of Grapevine Pass (4.6 road mi E of Lodoga). 481 Comment
  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
  HSC69910  Phacelia tanacetifolia Thomas W. Nelson, Jane P. Nelson 1978-4-2 3876 Colusa Along Bear Valley Rd., 2 mi. N of Jct. with Hwy. 20 Comment
  HSC45512  Phacelia tanacetifolia M. Alcasas 1978-4-22 48 Colusa Bear Valley Rd., 2.3 mi. from Hwy. 20 419 Comment
  UCR225399  Phalaris aquatica Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5100 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20. Western part of ranch along ridge trail at Cache Creek Canyon, just south of junction with trail that leads east to Brophy Canyon and Thompson Creek 488 Comment
  POM198501  Phalaris lemmonii Roxana S. Ferris 1917-4-12 547 Colusa 4 miles east of Williams. Comment
  CAS-BOT-BC265956  Phalaris minor Roxana S. Ferris 1917-4-12 508 Colusa 4 miles east of Williams Comment
  UC50462  Phalaris paradoxa J. Burtt Davy May, 1898 4264 Colusa near Princeton; near Princeton Comment
  JEPS71108  Phlox gracilis Alice King May 1906 Colusa College City Comment
  SEINET7096814  Phlox gracilis A. G. Vestal 1985-4-5 s.n. Colusa Along Route 16 about .2 mile south of Route 20 and near Bear Creek. NAD27, 39? deg. 00'36ao , -122?_ 21'22ao (converted to WGS84 decimal degrees). Comment
  UCR206810  Phlox gracilis George K. Helmkamp, E. A. Helmkamp 2009-3-17 14389 Colusa Inner North Coast Ranges Foothills, along CA-16 and Bear Creek, 4.3 miles south of the junction with CA-20 261 Comment
  HSC103841  Phoradendron bolleanum G. Fred Hrusa, K. van Katwyk 1995-4-22 12109 Colusa North end of Walker Ridge, ~1 mi. south of intersection with Bartlett Springs Rd. Parasite on Cupressus macnabiana 1000 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
  JEPS80199  Phoradendron libocedri L. R. Heckard and J. Hickman 1980-7-3 5354 Colusa n. side of rd. across from Summit Springs (Snow Mt., Colusa-Lake Co. boundary); Snow Mt. Comment
  UCR257578  Phoradendron macrophyllum George K. Helmkamp, Elizabeth Helmkamp 2014-1-4 22508 Colusa Sacramento Valley, along CA-20 at the junction with Alameda Court, 0.2 mile west of the Sacramento River crossing at Meridian 20 Comment
  CAS-BOT-BC135298  Phoradendron serotinum subsp. macrophyllum Roxana Stinchfield 1918-7-12 461 Colusa Sycamore Slough, Stinchfield Ranch Comment
  UC1124395  Phyla caespitosa H. S. Yates 1936-8-14 6134 Colusa 3 mi S of Colusa 15 Comment
  UCD72398  Phyla nodiflora Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5123 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Confluence of Cache and Bear Creeks at southern tip of ranch. 198 Comment
  UCD126735  Physalis acutifolia P. B. Kennedy 1922-1 s.n. Colusa Cortena. Comment
  CHSC80450  Physalis lancifolia Caroline Warren; Jenny Marr, Heidi West 1998-7-1 Colusa Vicinity of Peterson Road and Funks Creek. 91 Comment
  UC985936  Physalis lancifolia Herbert L. Mason and Verne Grant 1946-8-7 12979 Colusa 8 mi n Colusa; Butte Sink Comment
  UCD126760  Physalis lancifolia P. B. Kennedy 1925-9-18 s.n. Colusa Cortena. Comment
  UCD126762  Physalis lancifolia June McCaskill 1954-8-9 364 Colusa Butte Creek Farms, on east side of Sacramento River, around 4 miles east of Colusa. Comment
  CDA18788  Phytolacca americana J. D. 2000-4-28 PDR 019976 Colusa 2505 Zumwalt Rd., Williams. 30 Comment
  CHSC88510  Pilularia americana 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
  CAS-BOT-BC72814  Pinus sabiniana Roxana S. Ferris 1917-4-14 578 Colusa Arbuckle-Rumsey road, 7 mi. west of Arbuckle foothills. Comment
  CHSC94297  Piptatherum miliaceum Lowell Ahart 2006-8-9 13106 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  CHSC89829  Plagiobothrys austiniae B. Castro; S. Innecken 2001-3-20 1215 Colusa Vicinity of Maxwell, Golden Gate in Logan Ridge, Funks Reservoir, and the Glenn-Colusa canal. 39 Comment
  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
  CHSC77920  Plagiobothrys canescens Beth Hendrickson; Jean Witzman 1999-4-21 Colusa Vicinity of Antelope Valley and Sites. 137 Comment
  UCD163690  Plagiobothrys fulvus var. campestris Craig Thomsen 1999-4-15 1992 Colusa Bear Valley. About 5 miles north of Hwy 20, west of Bear Valley Rd. Comment
  CHSC112920  Plagiobothrys greenei B. Castro; L. Janeway, Robin Carter 2010-3-23 1804 Colusa Vicinity of Golden Gate in Logan Ridge, Funks Reservoir, and the Tehama-Colusa canal in disturbed, grazed annual grassland. 121 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
  SD180603  Plagiobothrys leptocladus Carol Witham, Jennifer Buck 2001-4-30 151 A Colusa 2.0 miles south of the town of Colusa along Highway 20, east of Highway 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001. Comment
  UCD18843  Plagiobothrys leptocladus Vernal Pool Team 2001; Carol Witham and Jennifer Buck 2001-4-30 151 A 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
  UCD120933  Plagiobothrys nothofulvus E. Witharm 1998-4-17 5 Colusa Bear Vly., Leesville-Lodoga Rd., 2 road miles NE from Bear Vly Rd. -- Leesville-Lodoga Rd. junction. Comment
  CHSC29711  Plagiobothrys scriptus K. R. Stern 1980-4-3 6622 Colusa North central portion of Delevan National Wildlife Refuge. 48 Comment
  CHSC89828  Plagiobothrys scriptus B. Castro; L. Janeway 2001-5-2 1243 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
  UC78102  Plagiobothrys shastensis unknown May 1886 Colusa Stites Comment
  POM63665  Plagiobothrys stipitatus Roxana S. Ferris 1917-4-12 533 Colusa 4 miles east of Williams. Comment
  UC78205  Plagiobothrys stipitatus K. Brandegee Apr 1889 Colusa Colusa Junction Comment
  CHSC52671  Plagiobothrys stipitatus var. micranthus James Jokerst 1986-5-6 2304 Colusa Near Lurline Creek. Vernal pool. 41 Comment
  CHSC77923  Plagiobothrys stipitatus var. micranthus Beth Hendrickson; Natalie Wight, Heidi West 1999-3-25 Colusa Vicinity of Antelope Valley and Sites. 121 Comment
  JEPS123890  Plagiobothrys stipitatus var. micranthus Lowell Ahart 2015-4-28 20115 Colusa About 5 1/2 miles east of Maxwell. Comment
  OBI6032  Plagiobothrys stipitatus var. micranthus Carl B. Wolf 1928-5-8 2123 Colusa Sacramento Valley, 3 mi S of Arbuckle 43 Comment
  SD28155  Plagiobothrys stipitatus var. micranthus Carl B. Wolf 1928-5-8 2124 Colusa 3.0 miles south of Arbuckle 42 Comment
  UCD58097  Plagiobothrys stipitatus var. micranthus Ellen Dean; C. Thomsen, S. Bledsoe, G. Harrington, D. Hickson 2007-3-25 3474 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
  JEPS20848  Plantago coronopus B. Crampton 1953-5-7 1219 Colusa 4 mi n Williams Comment
  JEPS123891  Plantago elongata Lowell Ahart 2015-4-28 20114 Colusa About 5 1/2 miles east of Maxwell. Comment
  CAS-BOT-BC366913  Plantago erecta Richard R. Halse 2013-3-27 8761 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
  CHSC59997  Plantago erecta Linda A. Bell 1975-4-19 44 Colusa Bear Valley Road, 1 mile north of State Highway 20. Comment
  CHSC81283  Plantago erecta J. Trizzino 2001-3-31 18 Colusa Bear Valley Meadow along east side of Bear Balley Road. 396 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
  POM61338  Plantago erecta Roxana S. Ferris 1917-4-12 496 Colusa 4 miles east of Williams. Comment
  SEINET8665581  Plantago erecta R. R. Halse 2013-3-27 8761 Colusa Along State Hwy. 20 just east of the Colusa/Lake County Line, ca 14.6 miles east of the junction of state Hwys. 20 and 53 558 Comment
  UCD64289  Plantago erecta Craig D. Thomsen 2000-3-31 2122 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCD72478  Plantago lanceolata Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3812 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. West side of Bear Creek, across from BLM parking lot that is located at south end of bridge. 249 Comment
  CHSC113049  Plantago major Lowell Ahart 2013-10-1 19094 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
  CHSC23889  Platystemon californicus D. Joley 1968-3-30 Colusa Found on hwy. 20 ca. 20 mi e of Clearlake. Comment
  CHSC27552  Platystemon californicus Scott E. Patton 1978-4-9 9 Colusa Ca. 0.3 m w of jct of Hwys 20 and 16, s side of Bear Creek, ca 18 sw of Williams. 321 Comment
  UCD164029  Platystemon californicus Indya Messier 2016-4-9 3 Colusa BLM Bear Creek Ranch (previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. Just southwest of corral at junction of 16 and 20. 324 Comment
  CAS-BOT-BC6406  Platystemon californicus Mary Katherine (Mrs.) Brandegee 1889-4-1 s.n. Colusa unspecified Comment
  CDA34082  Platystemon californicus P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  HSC72768  Platystemon californicus J. Krajanowski 1981-4-4 3 Colusa .3 mi. W of junction of Hwy. 20 and Hwy. 16, S side of Bear Creek, 18 mi. SW of Williams 322 Comment
  SEINET12091618  Platystemon californicus C. M. Corda 1982-1 4 Colusa Ca 0.3 mi W of jct Hwys 20 and 16, S side Bear Cr., ca 100 yds from S side Hwy 20, ca 18 mi SW of 322 Comment
  UCD82392  Plectritis ciliosa Craig Thomsen; G. Harrington 2009-5-12 2835 Colusa Colusa County. Walker Ridge. South of spur road en route to Eaton Springs, about 1/2 mile east of Walker Ridge Rd. About 200 yds south of road (ravine with spring below). 822 Comment
  UC1018914  Plectritis ciliosa subsp. ciliosa S. C. Dyal, A. Carter, E. Crum 1938-5-7 712 Colusa Colusa County Comment
  HSC65997  Plectritis congesta D. Boyd, M. Eichelberger, Tim Messick, T. Ranker 1980-4-20 45 Colusa Leesville Rd. from Leesville to Williams, 3.8 mi. E of Leesville. Comment
  JEPS16219  Plectritis macrocera Rimo Bacigalupi, Arthur Holmgren 1950-4-26 3171 Colusa 7.7 mi w of Sites (Grapevine Grade to Lodoga) 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
  UCD162996  Plectritis macrocera Craig D. Thomsen 2000-3-31 2085 Colusa Bear Creek Botanical Management Area. Roadside shoulder of Hwy 20 (south side), about 0.75 mile west of Hwy 20/16 intersection. 345 Comment
  CAS-BOT-BC244355  Poa annua Roxana S. Ferris 1926-4-21 6304 Colusa Near Sycamore Comment
  RSA31153  Poa annua A. A. Heller, H. E. Brown 1902-5-2 5439 Colusa Princeton. Comment
  SEINET3411984 Image available Poa annua George K. Helmkamp, E. A. Helmkamp 2012-2-9 18535 Colusa Sacramento Valley: River Road, 7.1 miles N of Colusa; east side of Sacramento River 18 Comment
  UCR206852  Poa annua George K. Helmkamp, E. A. Helmkamp 2009-3-11 14360 Colusa Sacramento Valley, along CA-20, 1.6 miles southwest of Colusa and just north of Colusa National Wildlife Refuge 15 Comment
  CHSC35776  Poa bulbosa Gail B. Phillips 1982-3-27 3 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. 143 Comment
  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
  UCD97127  Poa bulbosa Ellen Dean; G. Harrington, J. Alderson 2011-4-10 6911 Colusa Along Bear Valley Road at the Cal Fire station. 335 Comment
  UCD84517  Poa pratensis Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6068 Colusa Colusa County. On Lake County border. Walker Ridge. Along Walker Ridge Road. Buck Flat. 872 Comment
  JEPS120977  Poa secunda Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18643 Colusa On N side of Hwy 20, just E of Lake County Line, 12.2 air miles ENE of town of Clear Lake, 17.1 air miles W of Williams. Comment
  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
  CHSC33326  Poa secunda subsp. secunda P. Reynolds 1980-4-12 15 Colusa Ca. 0.3 mi. w of jct of Hwys. 20 and 16, s side of Bear Creek, ca. 18 mi. sw of Williams. 321 Comment
  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
  UCD90806  Poa secunda subsp. secunda Beecher Crampton 1958-4-21 4729 Colusa Southwestern Colusa County. 7.8 miles NW of Rumsey, along Hwy 16, just above junction of Bear Creek with Cache Creek. Comment
  JEPS127600  Polanisia dodecandra subsp. trachysperma David Isle 2014-7-27 2137 Colusa N side of Maxwell road, ca 2 miles W of Sites and 5.8 miles E of summit of Maxwell Grade. Comment
  JEPS104398  Polygonum amphibium var. emersum Lowell Ahart 2003-10-23 10656 Colusa In East Park Reservoir, ca 1/8 mi nw of Sites Lodoga Rd, ca 1 mi n of Lodoga, ca 21 mi w of Maxwell. 368 Comment
  CDA22742  Polygonum amphibium var. emersum P. Steinbaugh, Goodwin 1932-10-1 Colusa Near Grand Island. 0 Comment
  CHSC85960  Polygonum aviculare Jenny Marr; Caroline Warren 1998-5-4 Colusa Vicinity of Sites, Stone Corral Creek, and Antelope Valley. 106 Comment
  CHSC86836  Polygonum aviculare 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
  POM165592  Polygonum aviculare Roxana Stinchfield 1916-7-11 457 Colusa Sycamore Comment
  JEPS80124  Polygonum bistortoides L. R. Heckard and J. Hickman 1980-7-1 5282 Colusa cirque between East Peak and West Peak (ca 10 mi w of Stonyford); Snow Mt. 2042 Comment
  JEPS80203  Polygonum douglasii subsp. douglasii L. R. Heckard and J. Hickman 1980-7-3 5358 Colusa just w Summit Springs (ca 10 mi w of Stonyford, Colusa-Lake Co. boundary); Snow Mt. 1548 Comment
  JEPS80764  Polygonum parryi L. R. Heckard and J. C. Hickman 1981-7-30 5731 Colusa meadow n Trout Creek (se side of mt.); Snow Mt. 1828 Comment
  JEPS110100  Polygonum punctatum Lowell Ahart 2006-8-9 13133 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  JEPS118671  Polypogon australis L. P. Janeway, B. Castro 2011-5-19 10282 Colusa Sacramento Valley. Extreme west edge of SacramentoValley; 1.8 km southeast of Funks Reservoir and 0.1 km northeast of Tehama-Colusa Canal. Comment
  CDA28167  Polypogon interruptus L. Ahart 2006-8-9 13159 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. Comment
  CHSC107161  Polypogon monspeliensis L. P. Janeway; B. Castro 2011-5-19 10281 B Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 1.8 km southeast of Funks Reservoir and 0.1 km northeast of Tehama-Colusa Canal. Large +- alkaline vernal pool/marsh; mucky clay soil. At edge of deepest west end of the marsh in a large patch of Juncus balticus, at the edge of the water line. 49 Comment
  CHSC77637  Polypogon monspeliensis Heidi West; Caroline Warren, Julie Cunningham, Jenny Marr 1998-5-27 Colusa Vicinity of Antelope Valley, Huffmaster Road, and Sites. 121 Comment
  JEPS75438  Polypogon monspeliensis W. L. Jepson 1934-5-4 16604 Colusa Princeton Comment
  HSC97043  Polypogon viridis L. Ahart 2006-8-9 13159 Colusa N side and under the bridge across Stony Creek, just N of Stonyford. 348 Comment
  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
  SEINET10333351  Populus fremontii R. 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
  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
  UCR225261  Potamogeton diversifolius Ellen Dean, Gordon Harrington, J. Anderson, E. Bayon, R. Willmarth 2008-6-8 5107 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
  UCD35976  Potamogeton nodosus Beecher Crampton 1963-8-5 6870 Colusa 1/4 mile E Cortena. Comment
  UCD39221  Potamogeton nodosus Beecher Crampton 1963-8-5 6870 Colusa 1/4 mile E of Cortena. Comment
  UCD67086  Potamogeton pusillus Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5108 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
  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
  RSA666315  Potentilla drummondii Barbara Ertter 1989-7-2 8627 Colusa Long Glade, a V shaped meadow S of Milk Ranch just W of snow Mt West, about 11 airmiles due W of Stonyford. 1957 Comment
  JEPS27878  Proboscidea louisianica subsp. louisianica Richard Snow 1958-8-3 672 Colusa on road to Leesville near Hwy 20 Comment
  JEPS101449  Proboscidea lutea Dean W. Taylor 1999-8-10 17295 Colusa 1 mile South of Williams, field between Interstate 5 and Delphos Road (old highway), 150 meters southeast of Husted Road freeway overcrossing 29 Comment
  JEPS27877  Proboscidea lutea Richard Snow 1958-8-3 671 Colusa on road to Leesville near Highway 20 Comment
  JEPS80440  Prunella vulgaris var. lanceolata L. R. Heckard and J. Hickman 1980-7-3 5369 Colusa sw slope Snow Mt. (about Summit Springs); sw slope Snow Mt., Summit Springs 1554 Comment
  UCD163849  Prunus subcordata Craig D. Thomsen 2000-6-7 2366 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  CHSC79456  Pseudognaphalium californicum B. Castro; L. P. Janeway 2000-5-4 1140 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 249 Comment
  UCD58168  Pseudognaphalium luteoalbum Gordon Harrington 2007-5-15 58 Colusa BLM Payne Ranch. Sandy north side of Cache Creek, about 1/2 mile upstream from the confluence of Cache Creek and Bear Creek. 190 Comment
  UCD133714  Psilocarphus brevissimus Beecher Crampton 1953-4-29 1146 Colusa 3 miles east of Maxwell. Comment
  JEPS18022  Psilocarphus brevissimus var. brevissimus George B. Rossbach 1955-4-9 558 Colusa 3 mi e Maxwell; Sacramento Valley 18 Comment
  UC1601294  Psilocarphus oregonus T. S. Brandegee Colusa Williams Comment
  CHSC86029  Psilocarphus tenellus var. tenellus Jenny Marr; H. West, J. Lacey, C. Warren, N. Wight 1998-4-14 Colusa Vicinity of Grapevine Creek, Antelope Valley, and Sites-Lodoga Road. 121 Comment
  UCD116917  Ptelea crenulata K. Esau; D. Hartmann 1941-7-17 s.n. Colusa Between Williams and Clear Lake, U.S. #20. Comment
  JEPS73504  Pterospora andromedea L. R. Heckard 1972-7-10 3121 A Colusa near Trout Creek crossing of trail to Box Springs; Snow Mt. 1828 Comment
  CHSC80413  Pterostegia drymarioides Caroline Warren; Jenny Marr 1998-5-4 Colusa Viciniy of Sites and Stone Corral Creek. 91 Comment
  HSC45682  Pterostegia drymarioides Sheila Logan 1978-4-22 63 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  JEPS80463  Pyrola aphylla Alice Q. Howard 1972-7-10 8 B Colusa Crossing trail from Fouts Camp to Box Springs, the highest of the two such areas on the north side of the ridge separating Trout and Paradise Creek. Snow Mountain 1676 Comment
  UC1562605  Pyrola picta Barbara Ertter 1989-7-1 8593 Colusa 12 air wsw of Stonyford (road to Goat Mountain Lookout 2.2 mi s of Rte M-10 (Bear Creek-Fouts Spring Rd) at head of South Fork Stony Creek); South Fork Stony Creek 1500 Comment
  UCD84509  Quercus X morehus Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6060 Colusa Colusa County. On Lake County border. Walker Ridge. Along Walker Ridge Road, between Cold Spring and Buck Flat. 971 Comment
  CDA15472  Quercus berberidifolia G. F. Hrusa, T. D. Wilfred 1998-6-19 14609 Colusa North Coast Ranges; Above upper Little Stony Creek. Goat Mtn. Rd. ~ 1.5 km. W of of campground. Comment
  UCD146596  Quercus berberidifolia G. F. Hrusa 1998-6-19 14609 Colusa Inner North Coast Ranges. Above upper Little Stony Creek. Goat Mountain Road. Around 1.5 km west of campground. 485 Comment
  CHSC90879  Quercus chrysolepis D. Isle 2003-6-25 215 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. 1767 Comment
  UCD144417  Quercus chrysolepis G. F. Hrusa 1998-10-28 14897 Colusa Inner North Coast Ranges. Above Fouts Springs. Through Springs Road mile 2.7. 750 Comment
  UCD83754  Quercus chrysolepis Ellen Dean; G. Harrington, K. Mawdsley, J. Shepard 2010-5-1 5951 Colusa Walker Ridge. Along Walker Ridge Road. 10 road miles N of intersection with Hwy 20. Just N of radio tower at Cold Spring Mountain on border with Lake County. 971 Comment
  UC993122  Quercus douglasii J. M. Tucker 1948-9-22 1869 Colusa 11.3 mi w Williams (beside road to Venado) Comment
  UCD45869  Quercus dumosa Hans G. Jung 1976-4-17 6 Colusa California, Colusa County: 2 miles west of Bear Valley, on north end of Walker Ridge, T15N, R6W, sec. 11. Elevation 1800 feet. 548 Comment
Read comments
Apr 18 2009
  UCD163843  Quercus durata Craig D. Thomsen 2000-6-1 s.n. Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCD55461  Quercus durata Ellen Dean; Gordon Harrington 2006-10-6 3285 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 381 Comment
  SEINET13953266 Image available Quercus durata Steven Lagos 1974-1 51 Colusa Wilbur Springs Quad., 3000 ft. 914 Comment
  CDA21886  Quercus durata var. durata L. P. Janeway 2000-5-31 6774 Colusa Inner North Coast Ranges.; On top of Hornet Nest Ridge, between Hornet Nest Spring and Hornet Nest Hill; about 6.4 km southwest of Stonyford. 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
  UCSC010369  Quercus durata var. durata Dylan M. Neubauer, Tim Forsell 2016-3-30 593 Colusa (NCoRI) Walker Ridge, Bartlett Springs Road, 1.22 air-miles sse Baldy Mountain 899 Comment
  CHSC92580  Quercus garryana var. breweri D. Isle 2005-7-14 1154 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. In saddle of Board Camp Ridge on 17N10, SE of the Homesites about 1 mile. SE of Boardcamp gate at the junction with OHV Trail 06 and road 17N10. 1633 Comment
  HSC90026  Quercus lobata Andrew Enberg, Brad Penkala, Dan Scofield 1990-4-14 49 Colusa Bear Valley Rd. 1.5 mi NW of Lambert Hill 427 Comment
  SEINET10881720  Quercus lobata Andrew Townesmith, Karen M. Meyer 2007-8-7 Townesmith 908 Colusa Mendocino National Forest, Grindstone Ranger District. Vicinity of Mill Creek Campground/Davis Flat OHV staging area. Off Forest Service route M10, 8.2 miles west of intersection with Lodoga-Stonyford road in Stonyford. T18N R7W, near edge between sections 4 and 5. 499 Comment
  UCD46857  Quercus lobata Herbert L. Mason 1947-3-29 13153 Colusa Butte Sink, along Butte Creek, ca. 3 miles northeast of Colusa. Comment
  UCD14524  Quercus palmeri Roger Raiche 1990-12-2 A Colusa California, Colusa Co.; across Sulphur Creek from Wilbur Springs; Comment
  UCD14526  Quercus palmeri Roger Raiche 1990-12-2 C Colusa California, Colusa Co.; across Sulphur Creek from Wilbur Springs; Comment
  UCD14530  Quercus palmeri John M. Tucker 1991-8-19 4496 -B Colusa California, Colusa Co.; across Sulphur Creek from, and southeast of, the hotel at Wilbur Springs; Comment
  JEPS73455  Quercus vacciniifolia L. R. Heckard 1972-7-8 3056 Colusa se of Snow Mt.; West Peak 1981 Comment
  UCD144336  Quercus wislizeni var. frutescens G. F. Hrusa 1998-11-7 14905 Colusa Inner North Coast Ranges. Above Fouts Springs. Through Springs Road mile 2.7. 750 Comment
  UCD84513  Quercus wislizeni var. frutescens Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6064 Colusa Colusa County. On Lake County border. Walker Ridge. Along Walker Ridge Road, between Cold Spring and Buck Flat. 971 Comment
  CHSC45699  Rafinesquia californica Vernon Oswald 1986-5-12 2004 Colusa Sites-Lodoga Rd. 0.2 mi w of Grapevine Pass. Roadside. 487 Comment
  SEINET11587858  Ranunculus canus Unknown 2009-3-11 14373 Colusa Williams Comment
  SEINET4208544  Ranunculus canus var. canus Richard R. Halse 2013-3-26 8740 Colusa Along the Leesville Road ca. 5.6 miles northwest of its junction with State Hwy. 20, west of Williams.; 0 157 Comment
  CAS-BOT-BC378805  Ranunculus canus var. canus A. A. Heller 1919-5-10 13113 Colusa grade east of Leesville in the oak belt Comment
  CHSC79555  Ranunculus hebecarpus B. Castro; L. P. Janeway 2000-5-4 1127 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 246 Comment
  SEINET4208857  Ranunculus hebecarpus Richard R. Halse 2013-3-26 8739 Colusa Along the Leesville Road ca. 5.6 miles northwest of its junction with Stat Hwy. 20, west of Williams.; 0 157 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
  CHSC32949  Ranunculus muricatus Thomas Nelson; Jane Nelson 1978-4-29 3948 Colusa Along Bear Valley Rd. 2.5 miles from junction with State Route 20. 365 Comment
  UCD163699  Ranunculus occidentalis Craig Thomsen 1999-5-10 2005 Colusa Bear Valley. About 8 miles north of Hwy 20. Comment
  UCD163875  Ranunculus occidentalis Craig D. Thomsen 2000-4-12 2453 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 1 mile west of Hwy 20/16 instersection. Comment
  UCD64518  Ranunculus occidentalis Craig D. Thomsen 2000-4-12 2117 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
  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
  UC1191437  Ranunculus orthorhynchus var. bloomeri G. Thomas Robbins and S. Galen Smith 1950-4-15 1907 Colusa Bear Valley Comment
  UC1952501  Raphanus Richard Halse 2007-3-22 7105 Colusa Williams, by the junction of 5th Street and B Street 25 Comment
  UCD13218  Raphanus sativus Steve Daniel 1986-4-13 9 Colusa California: Colusa Co. Bear Valley, 7.6 mi N of hwy 20 along Bear Valley rd. elev. ca. 1300 ft. 396 Comment
  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
  CDA16114  Rhamnus tomentella subsp. crassifolia G. F. Hrusa, Dmitri Geltman (LE) 1999-8-18 15239 Colusa North Coast Ranges; Along Little Stony Creek. 0 Comment
  JEPS79008  Rhamnus tomentella subsp. crassifolia Edward Lee with C. Belshaw 1936-12-13 2612 Colusa Stoneyford to Lodoga Road Comment
  RSA28824  Rhamnus tomentella subsp. crassifolia A. A. Heller 1916-6-6 12359 Colusa Coast Range on the grade 3 miles W of Leesville. 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
  CDA38890  Rhododendron occidentale var. californicum A. T. Leiser 1985-5-19 s.n. Colusa Between 3-4 miles along Frenzel Creek as it parallels the road M5 from Lodoga to Goat Mtn. Frenzel Creek is on south side of road and down 30-40 ft. 0 Comment
  HSC62926  Rhus aromatica Marla J. Carollo 1979-4-14 26 Colusa Buch Flat on Walker Ridge Rd. 884 Comment
  JEPS75853  Ribes lobbii L. R. Heckard 1974-9-10 3901 Colusa ne slope West Peak; Snow Mt. 2103 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
  UCD102432  Ribes quercetorum Mr. A. Jones 1934-2-11 s.n. Colusa Above Williams. Comment
  UCD108151  Ribes quercetorum Ellen Dean; G. Harrington, J. Alderson 2011-4-10 6900 Colusa Along Bear Valley Rd on west and east sides of road. 355 Comment
  UCD119994  Ribes quercetorum Ellen Dean; G. Harrington, J. Alderson 2011-12-30 7270 Colusa N side of Hwy 20 and Salt Creek Canyon between Hwy 16 and the Central Valley. Bear Valley Ranch property. Top of small canyon. 306 Comment
  UCD120073  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. Top of small canyon. 306 Comment
  SEINET12217802  Ribes quercetorum Unknown 1987-1 70029 Colusa W of Williams, Bear Valley, Bear Valley Rd, ca 0.5 mi NE of intersection with Brim Rd 433 Comment
  CHSC90878  Ribes roezlii D. Isle 2003-6-24 214 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. UTM's: 10S 0523825E 4346753N. 1767 Comment
  LA97624  Ribes roezlii J. M. Tucker; 1959-5-30 3524 Colusa Goat Mountain, ca. 1.25 mi. NW of Goat Mountain Lookout 1767 Comment
  UCD66967  Ribes roezlii Ellen Dean; Davis Botanical Society 2008-5-31 5011 Colusa west of I-5 at Maxwell, between Cedar grove campground and the summit, along Goat Mountain Road. 1658 Comment
  CHSC85967  Rigiopappus leptocladus Jenny Marr; Heidi West, Joyce Lacey-Rickert, Caroline Warren 1998-5-8 Colusa Vicinity of Sites and Antelope Valley. 121 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
  UC1613352  Rigiopappus leptocladus Charles M. Belshaw 1937-4-1 2878 Colusa vicinity Cook's Spring (Devil's Ridge); Inner N. Coast Range, Devil's Ridge Comment
  UCD57111  Rigiopappus leptocladus Gordon Harrington; Diana Hickson 2007-4-7 0023 Colusa Colusa Co. Ca. BLM Payne Ranch, SW intersection of Hwy 16 and Hwy 20, W of Roadkill Cafe, N of Thompson Creek. 434 Comment
  UCD66448  Rigiopappus leptocladus Craig D. Thomsen 2000-5-11 2293 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
  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
  CHSC84969  Rorippa curvisiliqua var. orientalis Lowell Ahart 2003-10-23 10664 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
  CHSC86881  Rorippa nasturtium-aquaticum B. Castro; S. Innecken 2003-4-2 1412 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Grapevine Creek. In bottom of small stream. 167 Comment
  JEPS80824  Rubus parviflorus L. R. Heckard and J. C. Hickman 1981-7-31 5794 Colusa e side Snow Mt.; e side Snow Mt., Dark Hollow Creek 1584 Comment
  CAS-BOT-BC158727  Rubus ursinus Roxana S. Ferris 1926-4-21 6310 Colusa Oak Graove Sycamore Slough, near Sycamore Comment
  CAS-BOT-BC158728  Rubus ursinus Roxana Stinchfield 1916-7-8 381 Colusa Sycamore Slough, Stinchfield Ranch Comment
  POM163497  Rubus vitifolius Roxana S. Ferris 1926-4-21 6310 Colusa Sycamore Slough/ Near Sycamore. Comment
  JEPS75734  Rumex acetosella L. R. Heckard 1974-9-9 3876 Colusa se of Foutch Camp (just ne of rocky promontory); Snow Mt. 1798 Comment
  CAS-BOT-BC421589  Rumex crispus Roxana S. Ferris 1926-4-22 6284 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
  UCD163344  Rumex salicifolius Craig D. Thomsen 2007-7-31 s.n. Colusa Walker Ridge. East of Eaton Springs en route to Rathburn Mine. Comment
  CHSC77928  Sagina decumbens subsp. occidentalis Beth Hendrickson; Jean Witzman 1999-4-22 Colusa Vicinity of Antelope Valley and Sites. 152 Comment
  UCR146703  Sagittaria June McCaskill, Et al. 1954-8-9 363 Colusa c. 1 mi east of Princeton and 500 yds. south of Glenn County line 23 Comment
  UCD138022  Sagittaria longiloba June McCaskill 1954-8-9 367 Colusa Grimes - Knights Landing Highway, ca. 3 miles south of Grimes. Comment
  CAS-BOT-BC445794  Sagittaria montevidensis Herbert L. Mason; Verne Grant 1946-8-7 12981 Colusa Eight miles north of Colusa Comment
  CAS-BOT-BC445795  Sagittaria montevidensis Milo S. Baker 1946-9-5 11632 Colusa Along Hiwy. between Colusa and Williams 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
  CHSC61041  Salicornia subterminalis Vernon H. Oswald; Mike Wolder, Joe Silveira 1993-7-26 5704 Colusa Colusa National Wildlife Refuge. Tract 7 just SW of the headquarters complex on O'Hair Rd., ca. 2 mi SW of Colusa. 12 Comment
  CAS-BOT-BC102859  Salix breweri C. Hart Merriam 1907-7-23 s.n. Colusa Cook Springs Comment
  CHSC70904  Salix breweri Vernon H. Oswald; Lowell Ahart 1998-4-21 8944 Colusa Stonyford-Lodoga Rd. 3.7 mi south of Stonyford. 384 Comment
  HSC71300  Salix breweri Thomas W. Nelson, Jane Nelson 1979-4-12 4626 Colusa Along Stony Creek below Digger Pine Campground Comment
  HSC71301  Salix breweri Thomas W. Nelson, Jane Nelson 1979-4-12 4525 Colusa Along Stony Creek below Digger Pine Campground Comment
  JEPS80787  Salix exigua L. R. Heckard and J. C. Hickman 1981-7-30 5760 Colusa se side Snow Mt. (Trout Creek) 1600 Comment
  UCD163351  Salix exigua Craig D. Thomsen 2000-5-12 2359 Colusa Walker Ridge. Along road to Elgin Mine. Comment
  UCD163863  Salix exigua Craig D. Thomsen 2001-5-31 2548 Colusa Bear Creek Canyon south of Sulphur Creek confluence. About 3 miles north of Hwy 20. Comment
  CAS-BOT-BC107839  Salix gooddingii Gordon H. True 1968-8-6 4576 Colusa In roadside ditch, on Hwy. between Maxwell and Delevan, ca. 1 mile N of Maxwell 30 Comment
  CAS-BOT-BC107840  Salix gooddingii Alice Eastwood 1921-4-11 10235 Colusa Colusa Comment
  CAS-BOT-BC107841  Salix gooddingii Alice Eastwood 1921-4-11 10237 Colusa Bear Valley 7.3 miles north of junction with California State Highway 20 along Bear Valley Road Comment
  CAS-BOT-BC104036  Salix hindsiana Roxana Stinchfield 1916-7-7 396 Colusa Sycamore Slough near Sycamore Comment
  UCD16133  Salix laevigata G. Robinson 1984-4-21 8 Colusa California. Colusa County: Bear Valley, 3.3 mi N of hwy 20, about 80-90 m W of Wilbur Springs Rd., top of rise above creek flood plain. 390 Comment
  UCD164152  Salix laevigata Craig Thomsen 1999-4-27 2002 Colusa Bear Creek Canyon. About 5 miles north of Hwy 20, 0.25 mile south of Wilbur Bridge. Comment
  UCD164153  Salix laevigata Craig Thomsen 1999-4-27 1999 Colusa Bear Creek Canyon. Along Bear Creek, just north of Sulphur Creek confluence, next to Wilbur Bridge. Comment
  JEPS80250  Salix lasiolepis L. R. Heckard and J. Hickman 1980-9-15 5429 Colusa slopes below Summit Springs; Snow Mt., <Lake-Colusa Co. boundary> 1524 Comment
  UC1179060  Salix lasiolepis Herbert L. Mason 1947-3-29 13161 Colusa ca. 3 mi ne Colusa; Butte Sink, Butte Creek Comment
  UCD81257  Salix lasiolepis Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5422 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
  CHSC112002  Salix lasiolepis David Isle; David Toren 2003-6-24 2128 Colusa NE border of Veratrum spring and mdw, 1/4 mi E of Goat Mtn Rd 16N03 jct w/Horse Glade rd; (with flowing water). 1670 Comment
  CHSC94432  Salix lasiolepis var. lasiolepis Lowell Ahart 2006-8-9 13147 Colusa Gravel bar, north side and 30 yards west of the bridge across Stony Creek, just north of Stonyford. 347 Comment
  CDA5812  Salpichroa origanifolia Agricultural Commissioner 1960-3-29 Colusa 0 Comment
  JEPS118679  Salsola soda B. Castro with Dave Bogener 2011-9-1 1913 Colusa Sacramento Valley. 10 air mi W of the Sacramento River and 800 ft N of the northern boundary of Delevan NWR. Near where Hunters and Logan Creeks empty into the Colusa Basin Drain. Moulton Weir 7.5' quad. Comment
  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
  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
  CHSC79524  Salvia columbariae B. Castro; L. P. Janeway 2000-5-4 1137 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 249 Comment
  SEINET12318609  Salvia columbariae K. A. Smail 1978-1 s.n. Colusa Salt Canyon, N side of Salt Creek, Hwy 20, 11 mi WSW of Williams. Wilbur Springs Quadrangle, 15'* 143 Comment
  SEINET12326928  Salvia columbariae E. M. Kelly 1977-1 9 Colusa Salt Canyon, N side of Salt Creek, Hwy 20, 10 mi WSW of Williams. Wilbur Springs Quadrangle, 15'.* 143 Comment
  JEPS73506  Sambucus mexicana L. R. Heckard 1972-7-10 3123 Colusa e Trout Creek crossing (on trail to Box Springs); Snow Mt. 1828 Comment
  JEPS80782  Sambucus mexicana L. R. Heckard and J. C. Hickman 1981-7-30 5755 Colusa Trout Creek Snow Mt. (se side of mt.) 1600 Comment
  UCD57658  Sambucus nigra subsp. caerulea Hildegarde Durkin; 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. North side of Thompson creek. Along trail above Thompson Creek 362 Comment
  UC2029557  Sanicula bipinnata Richard R. Halse 2013-3-26 8741 Colusa Along the Leesville Road ca. 8.3 miles northwest of its junction with State Highway 20 west of Williams, or 4.8 miles southeast of the junction with Bear Valley Road Comment
  JEPS228  Sanicula bipinnatifida W. L. Jepson 1932-5-8 16273 Colusa Lodoga; w Colusa Co. Comment
  UCD56944  Sanicula bipinnatifida Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3546 Colusa BLM Payne Ranch. On west side of Hwy. 16. 2 road miles south of intersection with Hwy. 20. 312 Comment
  CDA38531  Sanicula bipinnatifida T. C. Fuller 1958-4-17 s.n. Colusa 1 mile south of Lodoga. 0 Comment
  JEPS73498  Sanicula graveolens L. R. Heckard 1972-7-10 3116 Colusa near Trout Creek crossing of trail to Box Springs (Snow Mountain); Snow Mountain 1828 Comment
  UCD163232  Sanicula tuberosa Craig D. Thomsen 2001-4-12 2437 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 1 mile west of Hwy 20/16 intersection (about 1/8 mile east of vista point). 345 Comment
  UCD82861  Sanicula tuberosa Gordon Harrington 2008-4-13 72 Colusa BLM Payne Ranch. Slopes to the SW of junction of Hwy 16 and Hwy 20. E of unnamed creek (flowing now). 385 Comment
  UCD163867  Schedonorus arundinaceus Craig D. Thomsen 2001-5-31 2555 Colusa Bear Creek Canyon, south of Bear Valley. About 4 miles north of Hwy 20. Comment
  RSA714648  Schedonorus pratensis Daisie Huang 2006-4-15 6041503 Colusa Maxwell rest stop on I-5. Flat meadow. 25 Comment
  UCR225397  Schoenoplectus acutus Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5109 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
  CHSC75646  Schoenoplectus pungens Vernon H. Oswald 1999-6-22 9772 Colusa Fouts Springs Rd. (M10) 6.7 mi west of Stonyford-Elk Creek Rd. 597 Comment
  UCD50161  Schoenoplectus pungens D. Sanchez-Mata 1998-7-10 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain between Lodoga and Red Rock Cabin. 420 Comment
  CAS-BOT-BC111672  Schoenoplectus pungens var. longispicatus A. A. Heller 1916-6-9 s.n. Colusa Coast Range about 8 miles west of Williams in the blue oak belt along a stream. Comment
  SEINET9769686 Image available Schoenoplectus tabernaemontani Richard Carter 2006-7-31 Colusa 3.7 mi SSE Colusa, jct. Hwy CA 20 and Hwy CA 45 Comment
  UCD83760  Scribneria bolanderi Ellen Dean; G. Harrington, K. Mawdsley, J. Shepard 2010-5-1 5956 Colusa Colusa County. Walker Ridge. Along Walker Ridge Road, Buck Flat. 875 Comment
  RSA589943  Scrophularia californica Michael A. Vincent, Robert M. Rhode 1996-3-30 7278 Colusa Along Bear Valley Rd. above Bear Creek, 1.4 mi. S jct. Wilbur Springs Rd. Comment
  JEPS83803  Scutellaria californica L. R. Heckard and J. C. Hickman 1981-7-30 5772 Colusa heading up East Ridge of Snow Mountain, West Peak 1950 Comment
  UCD81706  Scutellaria californica Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5714 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones Spring area on W side of road, ca. 6.5 road mi N of junction with Hwy 20. W side of road. 833 Comment
  UCD82582  Scutellaria californica Craig D. Thomsen; J. Wiegand, S. Harrison, G. Harrington, A. Fulks 2008-4-22 2727 Colusa Walker Ridge. Eaton Springs, 4 mi N of Hwy 20, ca. 1.5 mi E of Walker Ridge Rd. 609 Comment
  UCD81728  Scutellaria siphocampyloides Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5730 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
  SEINET7042567  Scutellaria siphocampyloides A. G. Vestal 1938-9-1 s.n. Colusa Along top of trough, Springs Ridge near Foxtrap Springs. Fouts Spring quadrangle UTM Zone 10, 530960mE, 4350980mN. Comment
  SFV10451  Scutellaria tuberosa M. L. Vincent 1968-6-8 779 Colusa Goat Mountain Road, 1 mile from Stanford turnoff. Comment
  UC1085313  Sedum laxum subsp. laxum Freed Hoffman July, 1947 Colusa rocky outcrops at summit Goat Mountain (western Colusa or eastern Lake County); summit Goat Mountain 1859 Comment
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Oct 29 2020
  RSA700356  Senecio clevelandii L. P. Janeway, B. Castro 2001-6-3 7103 Colusa At Buck Flat: East side of Walker Ridge at head of Gaither Canyon; about 1.3 km. south-southeast of Baldy Mountain. 872 Comment
  POM174569  Senecio eurycephalus Roxana S. Ferris 1926-4-23 6454 Colusa Stonyford 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
  CHSC94470  Setaria viridis Lowell Ahart 2006-8-9 13137 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  HSC87050  Sidalcea diploscypha L. Blackford, S. Branch, D. Malm 1988-4-16 67 Colusa 2 mi. W on Brim Rd. from corner of Brim Rd. and Bear Valley Rd. 518 Comment
  JEPS120911  Sidalcea diploscypha Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18647 Colusa Rocky serpentine outcrop on the N side of Hwy 20, just E of the Lake County line, 12.2 air miles ENE of the town of Clear Lake, 17.1 air miles W of Williams Comment
  JEPS94196  Sidalcea diploscypha Vernon Oswald and Lowell Ahart 1998-5-7 9003 Colusa Bartlett Springs Rd. 2.1 mi. w. of Bear Valley Rd., 0.8 mi. e. of Sawtelle Valley and Grapevine Flat Rds. 524 Comment
  SFV17852  Sidalcea diploscypha J. M. Tucker 1980-5-3 4443 Colusa Bear Valley. 4.3 miles south of junction of Brim Road and Bear Valley Road. 396 Comment
  UCD57851  Sidalcea diploscypha Gordon Harrington; Diana Hickson, Jack Alderson 2007-4-29 41 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
  JEPS116995  Sidalcea diploscypha David Gowen 2008-5-24 919 Colusa Bear Valley Road about 5.4 miles north of Hwy 20. Comment
  UCD163840  Sidalcea hartwegii Craig D. Thomsen 2001-4-12 2470 Colusa Bear Valley. About 7 miles north of 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
  JEPS116996  Sidalcea keckii David Gowen 2008-5-24 922 Colusa Sites Ladoga Rd., northeast of Ladoga, ca. 1.9 miles southwest of Grapevine Pass. Comment
  JEPS50071  Sidalcea keckii W. L. Jepson 1932-5-7 16260 Colusa valley 2 mi above Venado (w Colusa Co.); Venado (valley 2 mi above) Comment
  CHSC91809  Sidalcea oregana subsp. hydrophila G. F. Hrusa; S. Winterton 2004-6-6 16385 Colusa Northern California. Inner North Coast Ranges. Mendocino National Forest. Rd 21N06D off 21N06 off Forest Rd. M3. Lower Markham Ridge at small pond site. Pond visible on 7.5' topo. 1348 Comment
  JEPS75834  Silene californica L. R. Heckard 1974-9-11 3950 Colusa on Foutch Camp--Box Spring trail just w Trout Creek crossing (Snow Mt.); , w of Trout Creek crossing on Foutch Camp-Box Sprin 1828 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
  UC1299502  Silene campanulata Freed W. Hoffman 1947-6-19 1674 Colusa Cooks Springs North Coast Ranges, Cooks Springs 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
  UCD23381  Silene laciniata subsp. californica Beverly Ortiz 1978-4-8 16 Colusa Rhizomes spreading horizontally beneath the ground, stems pubescent, flowers red. Moist soil, growing in a litter layer, partially shaded by shrubs, growing on flat on slope. 2 miles north of the intersection of Highway 16 and Highway 20. 408 Comment
  HSC29849  Sinapis arvensis Thomas W. Nelson 1972-4-8 605 Colusa Beside Bear Valley Rd., 2 mi. N of Hwy. 20 Comment
  RSA249346  Sinapis arvensis Thomas W. Nelson 1972-4-8 605 Colusa Beside the Bear Valley road ca 2 mi N of Hwy 20. 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
  JEPS124249  Sisymbrium orientale Lowell Ahart 2015-4-1 19993 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
  CHSC58404  Sisyrinchium bellum Clinton C. Shock 1980-5-3 58 Colusa Bear Valley, ca. 12 miles northwest of Highway 20. 384 Comment
  CHSC118887  Sisyrinchium bellum David Isle; Frank Pendell 2017-5-17 2173 Colusa Foothils E edge of N Coast Range: W of Stonyford ~1.5 miles on 18N01.1 to Frank and Sheri Pendell Ranch; in black adobe pasture S of house ~1/8 mile. 381 Comment
  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
  NY821006  Solanum nodiflorum R. J. Stinchfield 1916-7-7 385 Colusa Stinchfield Ranch. Sycamore Slough bed Comment
  CHSC114061  Solanum parishii Richard R. Halse 2012-3-29 8456 Colusa Along State Hwy. 20 ca. 6.8 miles northeast of its junction with State Hwy16 176 Comment
  CHSC77963  Solanum parishii Beth Hendrickson; Jean Witzman 1999-3-17 Colusa Vicnity of Antelope Valley, Grapevine Creek, and Sites-Lodoga Road. 152 Comment
  HSC41467  Solanum parishii Richard Runyon 1977-4-24 35 Colusa Along Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  HSC42017  Solanum parishii M. A. Baker 1977-4-24 222 Colusa Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  HSC62930  Solanum parishii Kenneth Clark 1979-4-14 103 Colusa Bear Valley Rd. 3.9 mi. N of State Rte. 20 412 Comment
  NY821173  Solanum parishii R. J. Stinchfield 1916-6-18 299 Colusa Near College City 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
  CHSC45991  Solanum rostratum Lowell Ahart 1980-6-11 2370 Colusa Along the edge of the River Road, where the road dips and floods during high water, about 9 1/2 miles north of Colusa. 30 Comment
  NY723192  Solanum rostratum L. Ahart 1980-6-11 2370 Colusa 9¼ miles north of Colusa 35 Comment
  CAS-BOT-BC157050  Solanum umbelliferum R. S. Ferris 1917-4-14 590 Colusa Along Sand Creek, Arbuckle - Rumsey Road Comment
  CAS-BOT-BC157051  Solanum umbelliferum R. J. Stinchfield 1916-6-18 299 Colusa Timber near College City Comment
  JEPS16203  Solanum umbelliferum Rimo Bacigalupi, Arthur Holmgren 1950-4-25 3175 Colusa 10 mi nw of Sites (Grapevine Grade to Lodoga); Grapevine Grade Comment
  UC1733755  Solanum umbelliferum Kay H. Beach 1940-5-16 658 Colusa Colusa and Lake county line Comment
  CDA15549  Solidago californica G. F. Hrusa 1998-10-28 14900 Colusa North Coast Ranges; along Cedar Camp Rd. as it enters Little Stony Ck. Cyn., approx. 1 mi. from Lodoga/Stonyford Rd. Comment
  CHSC101399  Solidago elongata David Isle 2001-7-26 1576 Colusa SW side of Letts Lake; N of day use area; N of trail between swamp thistle and tule patch. 1377 Comment
  CHSC91068  Solidago velutina subsp. californica D. Isle 2002-8-12 180 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. 585 Comment
  UCD72466  Sonchus asper Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3800 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. Bank of Bear Creek near north end of bridge, west side of creek. 260 Comment
  CAS-BOT-BC236519  Sorghum bicolor J. H. Thomas 1960-8-29 8845 Colusa About 5.3 miles east of Lake-Colusa County line along Highway 20 between Clearlake and Williams Comment
  CAS-BOT-BC236520  Sorghum bicolor Mary L. Bowerman 1940-1-1 3836 Colusa Wall Point Trail, Mount Diablo Comment
  CAS-BOT-BC235304  Sorghum halepense Herbert L. Mason 1945-9-19 12723 Colusa Below causway over Butte Sink spillway, east bank of Sacramento River, 1 mile north of Colusa Comment
  UCR206354  Spergularia George K. Helmkamp, E. A. Helmkamp 2009-3-11 14382 Colusa Sacramento Valley, along CA-20, 0.1 mile east of its junction with I-5, north end of Williams 49 Comment
  CAS-BOT-BC390067  Spergularia atrosperma Roxana S. Ferris 1917-4-12 509 Colusa 4 miles East of Williams Comment
  CAS-BOT-BC390769  Spergularia marina G. B. Rossbach; R. P. Rossbach 1938-5-31 637 Colusa 2 mi. so. of Maxwell Comment
  CHSC94290  Stachys ajugoides var. rigida Lowell Ahart 2006-8-9 13091 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  JEPS110534  Stachys ajugoides var. rigida Lowell Ahart 2006-10-31 13539 Colusa On the south side of road M 10, about 6 miles by road west of Stonyford 583 Comment
  CHSC88559  Stachys albens L. P. Janeway 2001-6-6 7116 Colusa Inner North Coast Ranges. Malaney Flat, about 4.8 km (air) east of Walker Ridge Road. Large open meadow. 610 Comment
  JEPS94680  Stachys albens Vernon H. Oswald and Lowell Ahart 1998-7-15 9268 Colusa Bartlett Springs Rd. 1.6 mi w Bear Valley Rd. 487 Comment
  JEPS94742  Stachys albens Vernon H. Oswald and Lowell Ahart 1998-7-15 9268 Colusa Bartlett Springs Road 1.6 mi w of Bear Valley Road; Bartlett Springs Road 487 Comment
  JEPS95820  Stachys albens Vernon H. Oswald and L. Ahart 1999-6-22 9784 Colusa 1.5 mi west of Stonyford-Lodoga Road on County Road 42 paralleling Little Stony Creek: T17N R6W Sect. 29, ca. 1400 ft, 1180 ft, chaparral, serpentine substrate 426 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
  UCD64039  Stachys albens Craig D. Thomsen 2000-6-23 2417 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, Colusa Co. milepost 2.63. 304 Comment
  UCD70231  Stachys albens D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley Road. Bear Valley Creek. 370 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
  JEPS120802  Stachys rigida var. rigida Lowell Ahart 2013-10-1 19080 Colusa Strand of East Park Reservoir, about 2.5 air miles SE of Stonyford, about 2.5 miles NW of Lodoga, about 10 air miles NW of Sites. Comment
  CHSC61429  Stachys stricta Vernon H. Oswald 1993-8-16 5806 Colusa Sacramento National Wildlife Refuge. Refuge located ca. 7 mi S of Willows, W 1/4 of Tracts 44, near the S boundary of the refuge. Growing on N bank of Hunters Creek. 24 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
  CAS-BOT-BC374775  Stebbinsoseris heterocarpa Roxana S. Ferris 1917-4-14 570 Colusa 7 mi west of Arbuckle, Arbuckle - Rumsey Road 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
  UCD84552  Stephanomeria Ellen Dean; C. Thomsen, T. Hansen, and windfarm meeting 2010-6-11 6150 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones spring area on W side of road. Ca 6.5 road miles N of junction with Hwy 20. W side of road. 833 Comment
  CHSC94316  Stephanomeria paniculata Lowell Ahart 2006-8-9 13099 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  JEPS96910  Streptanthus breweri Dean W. Taylor 1998-6-23 16706 Colusa Walker Ridge, along BLM access road 929 Comment
  UCD115959  Streptanthus breweri D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. 370 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
  CAS-BOT-BC61234  Streptanthus breweri Roger Raiche 1985-5-25 RR 50459 Colusa West of Williams, Bear Valley, Bear Valley Road about 1 mile from its origin at Route 20. 365 Comment
  SEINET11993713  Streptanthus breweri Unknown 1985-1 50459 Colusa W of Williams, Bear Valley, on Bear Valley Rd about 1 mi from its origina at Rt. 20 366 Comment
  UC1051693  Streptanthus breweri var. breweri Helen K. Sharsmith 1953-6-18 4256 Colusa Candy Bucket Spring Inner North Coast Ranges, Mendocino National Forest (road from Stoneyford to Mill Spring) 609 Comment
  UC1051749  Streptanthus breweri var. breweri Helen K. Sharsmith 1953-6-17 4251 Colusa above Wilbur Springs; Inner North Coast Ranges, Wide Awake Mercury Mine 462 Comment
  UC956510  Streptanthus breweri var. breweri Freed W. Hoffman 1947-6-18 1019 Colusa Wilbur Springs Road Comment
  UC956511  Streptanthus breweri var. breweri Freed W. Hoffman 1947-6-19 1021 Colusa Cook Springs Comment
  UC956515  Streptanthus breweri var. breweri Freed W. Hoffman 1948-6-28 Colusa 1.8 mi n Fouts Springs; Red Bridge 441 Comment
  UCD57659  Streptanthus breweri var. breweri Madeline Christopher; with Plant Biology 102 2007-4-29 2 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Eastern/Central part of ranch. Craig Canyon. North side of unimproved road. 335 Comment
  CHSC35582  Streptanthus glandulosus J. P. Smith; Tom Nelson, Jane Nelson 1978-4-2 9565 Colusa Bear Valley Road, 2.1 miles from its junction with State Route 20. 365 Comment
  UC1178879  Streptanthus glandulosus subsp. glandulosus Herbert L. Mason 1941-4-5 12408 Colusa on road between Maxwell and Stonyford just w summit of grade Comment
  UC1552823  Streptanthus glandulosus subsp. glandulosus Frederica Bowcutt 1985-5-10 513 Colusa about 3 mi se Wilbur Springs (1 mi w of Hwy 20, base of steep s-facing hillsides); Wilbur Springs 15' Quad, Big Valley Shale Barrens Comment
  SEINET11993700  Streptanthus morrisonii Unknown 1984-1 RR 40259 Colusa W of Ladoga, Goat Mt Rd, along Little Stonyford Cr (2 mi W of origin of road at Ladoga-Stonyford Rd) 427 Comment
  HSC60473  Styrax redivivus J. P. Smith 1977-4-24 9039 Colusa Along Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  UCD119103  Styrax redivivus Roman Gankin 1965-5-5 518 Colusa On Bartlett Springs Road from Bear Valley, ca. 2 miles west of junction with Lodoga Road. Comment
  UCD119113  Styrax redivivus D. Sanchez-Mata; P. Rodriguez-Rojo 1997-7-25 s.n. Colusa Williams (c. 15 miles West). Blue Ridge near Bear Creek. 350 Comment
  UCD18644  Styrax redivivus Roman Gankin 1959-4-19 330 Colusa along road to Walker Ridge from Bear Valley. Comment
  UCD80818  Styrax redivivus Ellen Dean, G. Harrington; K. Mawdsley, C. Thomsen, G. Walden, E. McDermott 2009-3-18 5274 Colusa BLM Bear Creek (Payne) Ranch, lands to the SW of the jct of Hwys 20 and 16. E-facing slope above Eula Canyon and top of formation known as the Blue Ridge in the NE corner of the ranch. 529 Comment
  HSC47644  Styrax redivivus J. P. Smith, J. O. Sawyer 1978-4-29 9792 Colusa 640 Comment
  UCD163324  Suaeda nigra Craig D. Thomsen 1997-4-19 1906 Colusa Wilbur Springs. About 4 miles north of Hwy 20. Comment
  CAS-BOT-BC97650  Symphyotrichum chilense Milo S. Baker 1946-9-4 11618 Colusa Butte Sink, near locked gate of Colusa Gun Club Comment
  CHSC92638  Symphyotrichum spathulatum D. Isle 2005-9-14 1172 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. Meadow west of Angel Spring, Snow Mountain Wilderness. 10S 0522348E 4358185N = Angel Springs. Comment
  JEPS75858  Symphyotrichum spathulatum L. R. Heckard 1974-9-10 3892 Colusa south of, ( upper reaches of Dark Hollow Creek East Peak; Snow Mt., Dark Hollow Creek 2011 Comment