Search Results — 2000 specimen records retrieved (1608 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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A yellow cell in the column headed "?", for records with coordinates, indicates a discrepancy with respect to range as specified in the eFlora. Read more ...
? Specimen ID Determination * Collector Collection Date Collection Number County Locality Elevation in meters Feedback
  CDA25791  Abutilon theophrasti G. K. Helmkamp, E. A. Helmkamp 2008-10-14 14263 Colusa Sacramento Valley; Along River Road (generally following the Sacramento River), 8.4 miles north of Colusa. Comment
  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-BC334173  Acer negundo var. californicum Roxana Stinchfield 1916-7-8 398 Colusa Sycamore Slough, Stinchfield Ranch Comment
  CHSC25965  Achillea millefolium L. V. Ritter 1969-4-30 220 Colusa Ca 10 mi sw of Williams, s side of Highway 20. 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
  HSC45717  Achyrachaena mollis Sheila Logan 1978-4-22 60 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  POM52917  Achyrachaena mollis Roxana S. Ferris 1917-4-12 s.n. Colusa 4 miles east of Williams. Comment
  UCD64428  Achyrachaena mollis Craig D. Thomsen 2000-4-28 2204 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCSC001480  Achyrachaena mollis Peter Kamb 1950-1 1691 Colusa Stony ford Comment
  CHSC79733  Acmispon brachycarpus L. P. Janeway; B. Castro 2000-5-3 6699 Colusa Vicinity of Antelope Creek and Grapevine Creek. 426 Comment
  UCD66677  Acmispon denticulatus Craig D. Thomsen 2000-5-11 2290 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  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
  UCR261727  Acmispon rubriflorus Ann Howald 2003-6-9 2363 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3 miles north of Lodoga, east of Sleepy Hollow camping area 383 Comment
  UCR261740  Acmispon rubriflorus Ann Howald 2003-6-9 2364 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3 miles north of Lodoga, just north of Eagle Eye camping area 377 Comment
  CHSC71112  Acmispon wrangelianus Jan Monelo 1989-4-1 13 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. 143 Comment
  HSC44246  Acmispon wrangelianus Barbara Kelly 1977-4-24 351 Colusa Along Walker Ridge Rd. above Barrel Springs Campground. 701 Comment
  HSC72174  Acmispon wrangelianus J. P. Smith, Jane P. Nelson, Thomas W. Nelson 1978-4-2 9551 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  UCD163209  Acmispon wrangelianus Craig D. Thomsen 2000-4-28 2200 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 0.3 mile west of Hwy 20/16 intersection. 345 Comment
  UCD57278  Acmispon wrangelianus Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3646 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
  CAS-BOT-BC29713  Acroptilon repens F. L. Shanks 1931-10-1 s.n. Colusa Mills Orchard, near Maxwell Comment
  CAS-BOT-BC29714  Acroptilon repens F. L. Shanks 1931-10-1 s.n. Colusa Mills Orchard, near Maxwell Comment
  CAS-BOT-BC107  Adenostegia palmata Roxana Judkins [later Mrs. Ferris q.v.] Stinchfield 1916-6-17 284 Colusa near College City Comment
  CAS-BOT-BC133152  Adenostoma fasciculatum Roxana Stinchfield 1916-6-18 304 Colusa College City Comment
  CAS-BOT-BC133153  Adenostoma fasciculatum Roxana Stinchfield 1916-6-18 304 Colusa Near College City Comment
  UC205569  Adenostoma fasciculatum H. M. Hall 1919-10-5 Colusa on plains e. of R.R. Hershey Comment
  UC217393  Adenostoma fasciculatum H. M. Hall 1919-10-5 Colusa on plains n. of town and e. of R.R. Hershey Comment
  CHSC80490  Aegilops cylindrica Caroline Warren; Joyce Lacey-Rickert 1998-5-8 Colusa Vicinity of Sites and Antelope Creek. 91 Comment
  UCR206362  Aegilops triuncialis George K. Helmkamp, E. A. Helmkamp 2009-5-20 14749 Colusa Inner North Coast Ranges, along CA-16 at 'Cowboy Camp' 1.0 mile south of the junction with CA-20, adjacent to Bear Creek 332 Comment
  CDA4026  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
  UCD14572  Aeschynomene rudis June McCaskill; with Jim Hill 1990-9-5 s.n. Colusa Colusa Co.; near Princeton in a rice field; Comment
  SFV15098  Aeschynomene rudis B. J. McCaskill, G. D. Barbe (4397) 1990-9-5 s. n. Colusa West side of Boggs Road between Dodge and Fonseca Roads. MDB&M. Comment
  UCD104589  Aeschynomene rudis June McCaskill; with Jim Hill 1990-8-27 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
  UCD14547  Aesculus californica Rob Ickel 1989-5-27 12 Colusa California, Colusa Co.; along Highway 16, 1.5 mi south of junction with Highway 20; 316 Comment
  CHSC48483  Agastache urticifolia Vernon Oswald 1984-7-20 1613 Colusa Near the Lily Pond n of Letts Lake in Mendocino Nat. Forest. 1280 Comment
  CHSC32211  Ageratina occidentalis James Jokerst 1980-8-7 1062 Colusa North Coast Ranges. Near Snow Mountain (West). Comment
  UCD66705  Agoseris grandiflora Craig D. Thomsen 2001-4-12 2490 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
  JEPS80139  Agoseris grandiflora var. grandiflora L. R. Heckard with J. Hickman 1980-7-2 5299 Colusa ca 10 mi w, above Summit Spring entrance to Snow Mt trail Stonyford; Snow Mt. 1630 Comment
  UCD66857  Agoseris heterophylla Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5060 -a Colusa BLM Payne Ranch. Lands to the southwest of the intersection of Hwy 16 and Hwy 20. Destanella Flat. Serpentine meadow on the east side of main drainage. 554 Comment
  JEPS80135  Agoseris heterophylla var. heterophylla L. R. Heckard with J. Hickman 1980-7-2 5295 Colusa 10 mi w, just above Summit Spring entrance to Snow Mt. trail Stonyford; Lake County boundary 1630 Comment
  POM292576  Agoseris heterophylla var. heterophylla Lyman Benson 1933-4-16 4328 Colusa 5 miles east of Lake County line. Mt. Range: Inner N. Coast; Watershed: N. Fork Cache Creek. 457 Comment
  JEPS80446  Agrostis alba L. R. Heckard and J. Hickman 1980-9-15 5426 Colusa w Summit Springs (upper margin of moist seep on slope); Snow Mt. 1554 Comment
  CHSC94532  Agrostis avenacea Lowell Ahart 2006-8-22 13227 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UCD51826  Agrostis avenacea A. A. Beetle 1942-5-21 3274 Colusa 12 miles north of Williams. Comment
  UCD162995  Aira caryophyllea Craig D. Thomsen 2000-4-12 2169 Colusa Bear Creek Botanical Management Area. Roadside shoulder of Hwy 20 (south side), about 0.5 mile west of Hwy 20/16 intersection. 345 Comment
  UCD82469  Aira caryophyllea Craig Thomsen; G. Harrington 2009-5-12 2846 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  SEINET3917542  Aira caryophyllea Donald Spalinger 1974-5-4 47 Colusa St. John Mt. quad. North fork Campground on Stony Creek. 1600.; 0 Comment
  UC985647  Alisma lanceolatum Herbert L. Mason and Verne Grant 1946-9-5 13119 Colusa 1.6 mi w Williams (road to Lake County) Comment
  CAS-BOT-BC445355  Alisma plantago-aquatica Roxana Stinchfield 1916-7-11 469 Colusa Davis tule - Sycamore Slough Comment
  CHSC94417  Alisma triviale Lowell Ahart 2006-8-22 13231 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UCD66951  Alisma triviale Gordon Harrington 2008-6-16 s.n. Colusa BLM Payne Ranch. Lands to the SW of the jct of Hwys 20 and 16. Along Brophy Canyon Creek upstream of trail crossing. 457 Comment
  UCD82470  Allium Craig Thomsen; G. Harrington 2009-5-12 2847 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. About 100 yds south of road (ravine with spring below). 707 Comment
  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
  UCD66451  Allium amplectens Craig D. Thomsen 2000-5-11 2297 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  UCD82518  Allium amplectens Craig Thomsen; G. Harrington 2009-5-12 2875 b Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 713 Comment
  UCD82863  Allium amplectens Gordon Harrington 2008-4-13 76 Colusa BLM Payne Ranch. Slopes to the SW of junction of Hwy 16 and Hwy 20. E of unnamed creek (flowing now). 349 Comment
  UC119994  Allium amplectens T. S. Brandegee 1890-6-22 Colusa Snow Mt. 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
  CHSC90866  Allium falcifolium D. Isle 2003-6-25 217 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. Rd. 16N03. 1767 Comment
  JEPS15563  Allium falcifolium G. Thomas Robbins with L. R. Heckard 1956-7-25 3717 Colusa slope above Dark Hollow Creek (a tributary of Middle Fork Stony Creek) (on s flank of Snow Mt. at lower end of cirque between Snow Mt. West and Snow Mt. East); Snow Mt. 1981 Comment
  UCD63019  Allium falcifolium Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4671 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Slopes to the west of Cowboy Camp on the west side of Bear Creek. 419 Comment
  CAS-BOT-BC467302  Allium falcifolium Roxana S. Ferris 1926-4-23 6570 Colusa Dry Creek near Stonyford Comment
  CAS-BOT-BC467305  Allium falcifolium A. Burgard; J. Goldsmith; J. Kalt 1996-5-4 71 Colusa 8.4 miles north of Indian Resevoir Rd. 57 miles east of Hwy. 101 on Hwy 20 701 Comment
  POM174570  Allium falcifolium Roxana S. Ferris 1926-4-23 6570 Colusa Dry Creek near Stonyford. Comment
  SEINET12043975  Allium fimbriatum A. Eastwood, Howell, J. T. 1938-1 5626 Colusa Lake-- Colusa county line on road to Williams Comment
  SEINET12051857  Allium fimbriatum Unknown 1986-1 60124 Colusa W of Williams, Bear Valley area, Bear Valley Rd, ca .7 mi N of its origin at Rt.20 323 Comment
  CAS-BOT-BC135888  Allium fimbriatum subsp. purdyi David D. Keck 1933-5-30 2398 Colusa Colusa-Lake County line west of Wilbur Springs. Comment
  CAS-BOT-BC135891  Allium fimbriatum subsp. purdyi Lewis S. Rose 1936-4-27 36194 Colusa 22 mi. SW of Williams, Lake Co. - Colusa Co. boundary. 396 Comment
  CHSC112220  Allium fimbriatum var. purdyi Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18641 Colusa Inner North Coast Range. On the north side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  CHSC27630  Allium fimbriatum var. purdyi Robert A. Schlising 1978-5-13 3231 Colusa Just E of Lake County line, along Hwy 20. Comment
  JEPS120995  Allium fimbriatum var. purdyi Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18641 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
  RSA161099  Allium fimbriatum var. purdyi Peter H. Raven 1962-5-31 17908 Colusa Highway 20, 2.5 miles east of Lake County Line Comment
  RSA32757  Allium fimbriatum var. purdyi A. A. Heller 1940-5-6 s.n. Colusa Summit of the grade on Hwy 20, at the Lake Co. line 232 Comment
  UC518939  Allium fimbriatum var. purdyi David D. Keck 1933-5-30 2398 Colusa Colusa-Lake county line w Wilbur Springs Comment
  UC726499  Allium fimbriatum var. purdyi A. A. Heller 1942-5-29 16484 Colusa 1/2 mi e Lake County Line Comment
  UCD138532  Allium fimbriatum var. purdyi G. L. Stebbins Jr. 1962-5-6 6026 Colusa along Highway No. 20, Bear Creek, between Williams and Lower Lake, at Colusa-Lake County line. Comment
  UCD138533  Allium fimbriatum var. purdyi L. K. Mann 1958-5-3 s.n. Colusa about 0.8 mile toward Wilbur Springs from Junction of California Highway #16 and #20. Comment
  UCD57626  Allium fimbriatum var. purdyi Michele Lanctot; 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. Bottom of serpentine slope in the middle of the path. 356 Comment
  UCD82740  Allium fimbriatum var. purdyi Craig Thomsen; G. Harrington 2009-5-14 2921 Colusa Colusa County on Walker Ridge: southeast of Methany flat. 579 Comment
  SEINET3884500  Allium fimbriatum var. purdyi Thomas Nelson, Jane P. Nelson 1978-4-30 3972 Colusa State Route 20 just east of Colusa-Lake county line.; 0 549 Comment
  SEINET3884502  Allium fimbriatum var. purdyi D. W. McNeal 1980-4-26 2318 Colusa On an open slope above Bear Valley Rd., 1.4 mi. n. of its jct. with Hwy #20.; 0 Comment
  SEINET194974  Allium purdyi A. A. Heller 1940-5-6 15579 Colusa Summit of the grade on State Highway # 20 , at the Lake County line, 232 Comment
  CHSC42240  Allium serra Curtis Williges 1986-4-5 20 Colusa Hwy 20, 3 mi e of jct Hwy 16. 335 Comment
  CHSC71010  Allium serra Vernon Oswald; Lowell Ahart 1998-5-7 8992 Colusa Lodoga-Leesville Rd. 4.3 mi south of Cooks Springs Rd. 469 Comment
  HSC66002  Allium serra Cathie Goldberg, Lynn Kunstman, Lauren Philbrick, Geoff Walsh 1980-4-19 53 Colusa Leesville Rd. from Leesville to Williams, 3.8 mi. E of Leesville Comment
  JEPS47562  Allium serra W. L. Jepson 1932-5-7 16262 Colusa valley 2 mi above Venado 304 Comment
  UCD163211  Allium serra Craig D. Thomsen 2000-4-12 2145 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 0.3 mile west of Hwy 20/16 intersection. 345 Comment
  CAS-BOT-BC475547  Allium serra A. A. Heller 1919-5-10 13112 Colusa Grade east of Leesville in the oak belt on open grassy slopes. Comment
  CAS-BOT-BC475549  Allium serra James R. Shevock 1973-4-14 2551 Colusa Occasional along Leesville Road; Northern Coast Ranges Comment
  CDA39419  Allium serra Vernon H. Oswald & Lowell Ahart 1998-5-7 8992 Colusa Lodoga-Leesville Road 4.3 miles south of Cooks Springs Rd. Comment
  HSC47565  Allium serra J. P. Smith, J. O. Sawyer 1978-4-29 9793 Colusa Bear Valley Rd., 5.9 mi. from its junction with Hwy. 20 366 Comment
  UCD141823  Allium serra L. K. Mann; A. Saghir 1963-5-15 s.n. Colusa 1/2 mile east of Sites toward Maxwell. Comment
  HSC45664  Allophyllum gilioides Sheila Logan 1978-4-22 84 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  RSA293146  Allophyllum gilioides J. P. Smith, James Nelson, Thomas W. Nelson 1978-4-2 9561 Colusa Bear Valley Road, 2.1 miles from its junction with State Route 20. 366 Comment
  JEPS80795  Alnus incana subsp. tenuifolia L. R. Heckard and J. C. Hickman 1981-7-30 5765 Colusa Trout Creek Snow Mt. (se side of mt.) Comment
  UC1051700  Alnus rhombifolia Helen K. Sharsmith 1953-6-21 4310 Colusa near Stonyford; Inner North Coast Ranges, Big Stoney Creek 518 Comment
  CDA11421  Alopecurus saccatus G. F. Hrusa, K. van Katwyk 1995-4-22 12142 Colusa Inner North Coast Ranges; Low wet site in full sun along N side of Leesville Rd. approx. 4 m. NW of Hwy. 20. Annual. Comment
  RSA198503  Alopecurus saccatus Roxana S. Ferris 1917-8-12 549 Colusa 4 miles east of Williams, alkali plains. Comment
  UCD55944  Alopecurus saccatus A. A. Beetle 1942-5-21 3276 Colusa 12 miles north of Williams. Comment
  CAS-BOT-BC55587  Ambrosia psilostachya Roxana Stinchfield 1916-7-8 376 Colusa Along Sycamore Slough. Stinchfield Ranch Comment
  CDA32033  Ambrosia psilostachya D. Isle, Rhonda Isle 2007-9-9 1624 Colusa Mendocino National Forest- North Coast Ranges Middle Fork Stony Creek Watershed; Stonyford Park at NW edge of Indian VA Elementary School; about 100 yds SE of Co. Rd 306 Stony Creek Bridge; about 1/4 mile S of Glenn Co. line. 0 Comment
  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
  RSA718532  Ambrosia psilostachya L. Ahart 2006-10-31 13518 Colusa 20 yards northeast of the bridge across Stony creek, just north of Stonyford. 348 Comment
  UC71776  Ambrosia psilostachya H. P. Chandler 1905-9-14 Colusa Princeton Comment
  RSA78613  Ammannia coccinea J. T. Howell 1944-7-18 19837 Colusa 3 miles west of Williams. 30 Comment
  UC75674  Ammannia coccinea Ray Schirber 1905-1 Colusa near Grimes (Sacramento Valley); Sacramento Valley Comment
  UCD102899  Ammannia coccinea June McCaskill 1954-8-9 358 Colusa Ca. 2 miles E of Princeton and 300 yards S of Glenn County line. Comment
  CHSC29712  Ammannia robusta K. R. Stern 1980-6-30 6650 Colusa South central border area of Colusa National Wildlife Refuge. 45 Comment
  UC71657  Amsinckia Miss Alice King 1905-1 Colusa College City Comment
  CAS-BOT-BC213951  Amsinckia Roxana S. Ferris 1926-4-23 6414 Colusa At mountain house on the Williams-Stonyford Road Comment
  CDA43231  Amsinckia intermedia Richard R. Halse 2012-3-29 8457 Colusa Along State Highway 20 ca. 6.8 miles northeast of its junction with State Highway 16. 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
  POM287422  Amsinckia intermedia Lyman Benson 1935-3-27 6331 Colusa 6 miles west of Williams. 213 Comment
  SEINET12519076  Amsinckia intermedia Christine Laning 1973-1 108 -14 Colusa 10.0 miles northwest of Rumsey on Route 16, near Yolo/Colusa county line. Comment
  SFV3062  Amsinckia intermedia D. West 1960-4-10 11 Colusa Southern end of Bear Valley, 5 miles northwest of junction of State Highways 16 and 20. 244 Comment
  CHSC81225  Amsinckia lunaris L. P. Janeway; B. Castro 2001-4-18 7024 Colusa Vicinity of Grapevine Creek, Sites-Lodoga Road, and Scotties Spring. 274 Comment
  CHSC86529  Amsinckia lunaris B. Castro 2003-3-18 1384 a Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 213 Comment
  UC1093626  Amsinckia lunaris Francia Chisaki, Gene B. Newcomb 1958-4-1 1097 Colusa on road to Lodoga (0.7 mi nw of junction with Hwy 20) Comment
  UCD80836  Amsinckia lunaris Ellen Dean; G. Harrington, J. Alderson, M. Bibbo, B. Rice 2009-3-25 5293 Colusa BLM Bear Creek (Payne) Ranch, lands to the SW of the jct of Hwys 16 and 20. Ridge between Brophy Canyon and the canyon to its north. 366 Comment
  UCR206368  Amsinckia lunaris George K. Helmkamp, E. A. Helmkamp 2009-3-11 14368 Colusa Inner North Coast Range Foothills, along CA-20, 9.7 miles southwest of Williams, on the north side of Salt Creek 162 Comment
  UC1093625  Amsinckia lycopsoides Francia Chisaki, Gene B. Newcomb 1958-4-1 1096 Colusa on road to Lodoga and Wilbur Springs (0.5 mi nw of junction with Hwy 20) Comment
  RSA0089738  Amsinckia lycopsoides Roxana S. Ferris 1926-4-23 6414 Colusa At Mountain House on the Williams-Stonyford Road. Comment
  CHSC34508  Ancistrocarphus filagineus J. D. Prouty 1980-4-12 80 .66 Colusa Roadbank of Hwy 20 ca. 0.3 mi W of junction with Hwy 16 near Bear Creek Bridge. 320 Comment
  HSC72168  Ancistrocarphus filagineus J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9543 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  UCD166309  Ancistrocarphus filagineus Jack Major 1962-4-28 805 Colusa At entrance to Bear Valley. (Exact location unknown. Coordinates estimated by label maker.) 381 Comment
  RSA256677  Ancistrocarphus filagineus J. L. Hobson 1974-5-4 63 Colusa 0.75 mile from the junction to Indian Valley on Walker Ridge Road. 854 Comment
  JEPS91078  Androsace elongata subsp. acuta Dean W. Taylor 1992-4-16 12401 Colusa hillsides 0.4 mi due w from spillway into Little Stony Creek (Inner North Coast Ranges, East Park Reservoir); Inner North Coast Ranges, East Park Reservoir 411 Comment
  CHSC105170  Angelica tomentosa B. Castro; L. P. Janeway 1999-7-5 1013 Colusa Ca 11 air mi SSW of Stonyford, 5 mi NW of Indian Valley Reservoir, just N of Colusa/Lake Co line, at Bear Wallow Spring. In serpentine substrate on NNW-facing slope W of Lovelady Ridge rd ca 0.5 mi N of its jcn with USFS Rd 16N06, 0.5 mi NE of Pacific Point. 1045 Comment
  CHSC42572  Angelica tomentosa Vernon Oswald 1986-6-30 2178 Colusa Northwest side of Lily Pond near Letts Lake. 1188 Comment
  UCD66932  Anthemis cotula Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5081 Colusa BLM Payne Ranch. Lands to the SW of jct of Hwys 16 and 20. Northwestern part of ranch, along ridge trail on border of Lake and Colusa Counties. South of junction with trail that heads down to the headwaters of Thompson Creek. 633 Comment
  CHSC94883  Antirrhinum subcordatum Lowell Ahart 2006-6-11 12673 Colusa On the west side of an off road trail (Trail 30), about 50 yards south of Fouts Road, about 5 miles (by road) west of Stonyford. 613 Comment
  CHSC94710  Antirrhinum virga Lowell Ahart 2006-6-15 12792 Colusa On the west side of Forest Road 18N03, about 100 yards north of Mill Creek, near Fouts, Mill Creek Campgrounds, about 5 3/4 miles (air) west-southwest of Stonyford. 500 Comment
  CHSC79556  Aphanes occidentalis B. Castro; L. P. Janeway 2000-5-4 1127 A Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 246 Comment
  CHSC91007  Aphanes occidentalis D. Isle 2002-4-18 299 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. N of Chlorinator bldg., Rd. to Bath House Trail. 548 Comment
  UCD162982  Aphanes occidentalis Craig D. Thomsen 2002-2-7 2569 Colusa Bear Creek Botanical Management Area. Roadside shoulder of Hwy 20 (south side), about 0.3 mile west of Hwy 20/16 intersection. 345 Comment
  UCD64506  Aphanes occidentalis Craig D. Thomsen 2000-3-31 2093 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  CHSC62836  Apiastrum angustifolium Vernon H. Oswald; Lowell Ahart 1994-3-23 6017 Colusa Goat Mtn. Rd. just W of the bridge over Sullivan Creek, S of Stonyford. 505 Comment
  CHSC86964  Apocynum cannabinum B. Castro; Michelle Cedarborg 2003-5-1 1426 Colusa Vicinity of Logan Ridge, Sites Peak and Lurline Creek. By creek not far downstream of pond at creek headwaters 204 Comment
  CHSC48685  Aquilegia eximia Vernon Oswald 1984-7-20 1625 Colusa M10, 5.4 mi w of Rd. 306 at Stonyford. 609 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
  UCD63730  Arceuthobium campylopodum Craig D. Thomsen 2008-5-23 2739 Colusa BLM Payne Ranch. Southwest of intersection of Hwy 16 and Hwy 20. 0.75 mile south of Hwy 20 (south of Destanella Flat) and 2.5 miles west of Hwy 16. 520 Comment
  UC1078808  Arceuthobium campylopodum Job Kuijt 1957-4-30 1278 Colusa 1/2 mi towards Stonyford (blew the Old Mill Campground on the Stonyford Upper Lake Rd) 1127 Comment
  SEINET3239841  Arceuthobium occidentale R. L. Mathiasen 2009-1 2009 -21 Colusa 3.2 km E of Summit County line at vista point on St. Rte. 20. 400 Comment
  UCD163030  Arctostaphylos canescens D. O. Burge 2015-7-11 1754 Colusa Summit Springs area. 1480 Comment
  CHSC31970  Arctostaphylos manzanita L. Ahart 1976-2-14 1002 Colusa Ca. 3 mi W of sites. 365 Comment
  HSC67141  Arctostaphylos manzanita J. P. Smith, Thomas W. Nelson 1976-4-14 8587 Colusa Mendocino National Forest, confluence of Stony Creek and N Fork of Stony Creek. 427 Comment
  UCD163029  Arctostaphylos manzanita D. O. Burge 2015-7-11 1753 Colusa Summit Springs area. 1480 Comment
  UCD67000  Arctostaphylos manzanita Craig D. Thomsen; Gordon Harrington 2008-7-6 2781 -c Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western side of ranch along trail that follows the border of Lake and Colusa counties. South of Dunsfield Flat, along ridge trail above Cache Creek Canyon. 640 Comment
  CHSC92611  Arctostaphylos manzanita subsp. elegans D. Isle 2005-7-14 1152 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. In saddle of Boardcamp Ridge on 17N10, SE of the Homesites about 1 mile. SE of Boardcamp gate at the junction with OHV Trail 06 and road 17N10. 1633 Comment
  CAS-BOT-BC24376  Arctostaphylos manzanita subsp. manzanita Walter Knight; Irja Knight 1964-4-11 814 Colusa Between Lewisville and Ladoga. Comment
  JEPS80051  Arctostaphylos nevadensis L. R. Heckard with J. Hickman 1979-6-15 5051 Colusa east trail from Frog Pond to cirque of east and west peaks (ne slope of West Peak ridge); Snow Mt. 1981 Comment
  CAS-BOT-BC46195  Arctostaphylos stanfordiana Richard A. DeMartile 1982-10-10 s.n. Colusa Road between Ladoga and Goat Mountain Lookout. 914 Comment
  HSC67142  Arctostaphylos viscida J. P. Smith, Thomas W. Nelson 1976-4-14 8586 Colusa Mendocino National Forest, confluence of Stony Creek and N Fork of Stony Creek. 427 Comment
  HSC72176  Arctostaphylos viscida J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9554 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  SEINET9328832  Arctostaphylos viscida Unknown 1989-2-11 5821 Colusa Common on serpentine slopes above Bear Creek, on Bear Valley Rd. approx. 1 mi N of Hwy 20. W/ Quercus durata. Comment
  SBBG118100  Arctostaphylos viscida subsp. pulchella C. Bornstein, E. Collins, R. Lutsko 2004-6-18 Colusa Bartlett Springs Rd, ca. 1.3 mi E of jct with Bear Valley Rd 432 Comment
  UCD56680  Arctostaphylos viscida subsp. pulchella Jack Alderson 2007-3-25 s.n. Colusa BLM Payne Ranch. Destinella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 570 Comment
  UCD63712  Arctostaphylos viscida subsp. pulchella Craig D. Thomsen 2008-3-21 2721 Colusa BLM Payne Ranch. In narrow canyon just south of Hwy 20 (at Colusa Co. milepost 2.63), 0.5 mile west of intersection of Hwy 16 and Hwy 20. Comment
  UCSC010367  Arctostaphylos viscida subsp. pulchella Dylan M. Neubauer, Tim Forsell 2016-3-30 591 Colusa (NCoRI) Walker Ridge, Bartlett Springs Road, 1.22 air-miles sse Baldy Mountain 899 Comment
  SEINET5731548 Image available Arctostaphylos viscida subsp. pulchella Bruce Hartsough 1973-1 17 Colusa 7 mi. N of Hwy 20 on Walker Ridge Rd. 853 Comment
  CAS-BOT-BC44549  Arctostaphylos viscida subsp. viscida Eric B. Peterson; Thomas Ward; Matt Foruria 1995-4-1 47 Colusa Walker Ridge Rd., 0.9 mile NE of junction with Indian Valley Access Rd., adjacent to Freshwater Branch Creek. 810 Comment
  RSA589937  Arctostaphylos viscida subsp. viscida Michael A. Vincent, Robert Rhode, Karl Vincent 1996-3-30 7301 Colusa Along Brim Rd., 1.9 mi. W juct . Bear Valley Rd. Comment
  SBBG114894  Arctostaphylos viscida subsp. viscida C. Bornstein 1999-3-19 Colusa Brim Rd 396 Comment
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Dec 10 2014
  JEPS81416  Arenaria congesta var. crassula L. R. Heckard and J. C. Hickman 1982-7-9 6024 Colusa Goat Mt Goat Mt. (just east of Lookout) 1859 Comment
  UCD82434  Argemone munita Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5659 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 839 Comment
  SBBG29992  Argemone munita L. Constance 1939-5-14 2490 Colusa 1 mi E of Mill Crk Ranger Station 548 Comment
  UCD95197  Argemone munita K. Esau 1934-5-5 s.n. Colusa above Williams, Tahoe-Ukiah Highway. Comment
  JEPS16204  Argemone rotundata Rimo Bacigalupi, Arthur Holmgren 1950-4-26 3178 Colusa just w of base of the grade to Indian Valley (Bartlett Mountain Road), just w of Bear Valley, Inner North Coast Ranges, Bear Valley; Inner North Coast Ranges Comment
  CAS-BOT-BC400399  Aristolochia californica Roxana S. Ferris 1926-4-22 6308 Colusa Sycamore Slough near Sycamore Comment
  UCD146598  Arnica discoidea G. F. Hrusa 1998-6-19 14615 Colusa North Coast Ranges. USFS Pacific Ridge Road, 4-5 km northwest of intersecion with Colus County Goat Mountain Road. 1200 Comment
  CAS-BOT-BC82672  Arnica longifolia G. Thomas Robbins; L. R. Heckard 1956-7-25 3712 Colusa Along edge of Dark Hollow Creek (a tributary of Middle Fork Stony Creek), on southern flank of Snow Mt. East, 2011 Comment
  UC971989  Asclepias cordifolia Herbert L. Mason 1952-6-19 14302 Colusa Black Diamond Ridge Mendocino National Forest 822 Comment
  UCD82491  Asclepias fascicularis Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5677 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
  HSC72214  Asclepias solanoana Thomas W. Nelson, Jane P. Nelson 1980-6-24 5876 Colusa Along road to Snow Mtn. trail head at Summit Springs 1585 Comment
  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
  UC1051712  Asclepias speciosa Helen K. Sharsmith 1953-6-19 4262 Colusa near confluence of North and Middle Forks of Stoney Creek (Red Bridge Camp); Inner North Coast Ranges, Mendocino National Forest 548 Comment
  CHSC62834  Aspidotis densa Vernon H. Oswald; Lowell Ahart 1994-3-23 6014 Colusa Frenzel Creek Research Natural Area on the S side of Little Stony Creek, in the section on the E side of Frenzel Creek, S of Stonyford. 518 Comment
  RSA74062  Aster sonomensis Milo S. Baker 1946-9-4 11618 Colusa Butte Sink, near gate of Colusa Gun Club Comment
  SEINET12319578  Asteraceae K. A. Smail 1978-1 s.n. Colusa ca 0.3 mi W of jct Hwy 20 & 16, S side of Bear Creek, ca 18 mi SW of Williams 322 Comment
  UCD64032  Astragalus clevelandii Craig D. Thomsen 2000-6-23 2411 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, Colusa Co. milepost 2.63. 304 Comment
  CAS-BOT-BC178664  Astragalus clevelandii G. L. Stebbins 1972-6-25 8099 Colusa Ravine below Black Diamond Glade, 4 miles northwest of Stonyford 411 Comment
  SEINET4208041  Astragalus gambelianus Richard R. Halse 2013-3-27 8765 Colusa Along State Hwy. 20 just east of the Colusa/Lake County Line, ca. 14.6 miles east of the junction of the junction of State Hwys. 20 and 53.; 0 558 Comment
  UC83408  Astragalus gambelianus Katharine Brandegee april 1889 Colusa Colusa Junction Comment
  UCD163330  Astragalus gambelianus Craig D. Thomsen 2009-5-3 2799 Colusa Walker Ridge. Vicinity of Walker Ridge Rd., 0.5 miles north of Hwy 20. Comment
  UCSC0010466  Astragalus gambelianus Dylan M. Neubauer, Tim Forsell 2016-3-31 597 Colusa (NCoRI) Walker Ridge, Walker Ridge Road, 1.78 air-miles sse Cold Spring Mountain 815 Comment
  RSA475236  Astragalus gambelianus Aaron Liston 1988-3-16 699 -2 Colusa 3.3 miles N of Stonyford on Elk Creek Road. 300 Comment
  CHSC26305  Astragalus rattanii var. jepsonianus Pauleen Broyles 1977-4-16 119 Colusa Ca. .5 km w of Hwys 20 and 16, s side of Bear Creek, ca. 30 km sw of Williams. 316 Comment
  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
  UCD163317  Astragalus rattanii var. jepsonianus Craig D. Thomsen 1997-4-20 1914 Colusa Bear Valley. About 6 miles north of Hwy 20. Comment
  UCD169731  Astragalus rattanii var. jepsonianus Richard R. Halse 2013-3-27 8764 Colusa Along State Hwy. 20 just east of the Colusa/Lake County Line, ca. 14.6 miles east of the junction of State Hwys. 20 and 53. 558 Comment
  UCD63923  Astragalus rattanii var. jepsonianus Craig D. Thomsen 2002-2-27 2576 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  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
  UC82603  Astragalus tener var. ferrisiae Katharine Brandegee May 1884 Colusa Mountain House (=Mountain Home road sta.) Comment
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Feb 28 2006
  CDA11922  Athysanus pusillus G. F. Hrusa 1989-5-7 6088 Colusa North Coast Biodiversity Arena; Cedar Mtn. Rd. along Little Stony Creek, approx. 4 miles above intersection with Stonyford-Lodoga Rd. Comment
  JEPS53235  Athysanus pusillus Alice King May, 1906 Colusa College City 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
  UC2029560  Athysanus pusillus Richard R. Halse 2013-3-27 8763 Colusa Along State Highway 20 just east of the Colusa/Lake County Line, ca. 14.6 miles east of the junction of State Highway 20 and 53 Comment
  UCD114233  Athysanus pusillus Beecher Crampton 1958-4-21 4725 Colusa Colusa-Yolo County line, along State Hwy. 16, junction Bear and Cache Creeks, 7.4 miles northwest of Rumsey. Comment
  CHSC94745  Atriplex argentea var. mohavensis Lowell Ahart 2006-9-26 13346 Colusa Between the deep ditch and the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell. 24 Comment
  CHSC60279  Atriplex depressa K. R. Stern 1980-6-30 6654 Colusa Vernal Pool, south central border area of Colusa National Wildlife Refuge. 45 Comment
  JEPS90586  Atriplex depressa Dean W. Taylor 1993-7-9 13849 Colusa along Ohm Rd. 1 mi n Ware Road (se corner of Refuge); Sacramento Valley, Colusa National Wildlife Refuge 22 Comment
  RSA747234  Atriplex fruticulosa George K. Helmkamp, E. Helmkamp 2008-10-14 14250 Colusa Sacramento Valley: along CA-20, 0.2 mile east of the Sutter County Line 9 Comment
  CHSC61038  Atriplex joaquinana Vernon H. Oswald; Mike Wolder, Joe Silveira 1993-7-26 5702 Colusa Colusa National Wildlife Refuge. W side of Pool 3 on the S end of the refuge near Ohm Rd., ca. 2 mi N of Ware Rd., ca. 5 mi S of Colusa. 15 Comment
  CHSC108070  Atriplex micrantha B. Castro; Dave Boegner 2011-9-1 1911 Colusa Sacramento Valley. Larkins Childrens Rancho. 10 air mi NW of Colusa, 3 mi W of the Sacramento River and 600 ft N of the northern boundary of Delevan NWR. Near where Hunters and Logan Creeks empty into the Colusa Basin Drain. Common around outer western edges of managed +- saline wetland of Gunnersfeld Ranch duck hunting club, among patches of tules and cattails. On and just below berms. 17 Comment
  JEPS100804  Atriplex persistens Dean W. Taylor 1993-7-9 13853 Colusa 300 m S of Sacramento National Wildlife Refuge headquarters; Sacramento National Wildlife Refuge 30 Comment
  RSA724831  Atriplex prostrata L. Ahart 2006-9-26 13347 Colusa South side of the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5.5 miles east of Maxwell. 24 Comment
  JEPS90638  Atriplex rosea Dean W. Taylor 1989-8-4 10422 Colusa Colusa National Wildlife Refuge Great Central Valley (along Ohm Rd., along ditchbank) 39 Comment
  UC72556  Atriplex serenana var. serenana H. P. Chandler 1905-9-14 Colusa Princeton Comment
  HSC45723  Avena barbata Catherine Chin 1978-4-22 27 Colusa Bear Valley Rd., 1.5 miles from its junction with State Rte. 20 412 Comment
  UCD65638  Avena barbata Craig D. Thomsen 2000-4-12 2172 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
  SEINET3919631  Avena barbata J. P. Smith, Thomas Nelson; Jane P. Nelson 1978-4-2 9559 Colusa Bear Valley Road, 2.1 miles from its junction with State Route 20.; 0 366 Comment
  CHSC86015  Avena fatua 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
  RSA726847  Azolla filiculoides Lowell A. Ahart 2007-7-7 14260 Colusa About 1.25 miles east of River Road, about 17 miles west of Gridley. 20 Comment
  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
  CAS-BOT-BC100066  Balsamorhiza macrolepis James Jokerst 1985-4-5 2210 Colusa Wilbur Springs Quad. Near Coyote Peak 456 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
  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
  JEPS80794  Berberis aquifolium var. repens L. R. Heckard and J. C. Hickman 1981-7-30 5764 Colusa se Snow Mt (along Trout Creek) 1539 Comment
  SD131864  Bergia texana Barbara Ertter, Elizabeth Neese, et al. 1989-10-21 8869 Colusa Southeast end of East Park Reservoir north of Lodoga. 365 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
  JEPS73484  Boechera repanda L. R. Heckard 1972-7-9 3095 Colusa se slope Snow Mt. East Peak; Snow Mt. 2072 Comment
  POM262502  Boisduvalia densiflora var. densiflora Milo S. Baker 1941-7-8 10114 Colusa Colusa County: roadside ditch Bear Valley in adobe, S of Lodoga 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
  RSA0046899  Bolboschoenus glaucus Richard Carter 2006-7-31 17122 Colusa 3.7 mi SSE Colusa, jct. Hwy CA 20 and Hwy CA 45. Comment
  CAS-BOT-BC28201  Bolboschoenus glaucus Maxine Wilkes 1929-8-1 s.n. Colusa Unspecified Comment
  CAS-BOT-BC75491  Bolboschoenus glaucus B. Crampton 1953-4-29 1149 Colusa 4 miles east of Norman. Comment
  CAS-BOT-BC322142  Bolboschoenus maritimus Peter Rubtzoff 1965-9-14 5651 Colusa 4.5 miles from Hwy. 20 on the road to Wilbur Springs. Comment
  UCD140026  Bolboschoenus maritimus subsp. paludosus P. B. Kennedy 30-31 May 1922 s.n. Colusa Near Cortina. Comment
  CAS-BOT-BC418408  Boykinia occidentalis Volney Rattan 1877-6-26 s.n. Colusa Sulphur Creek Comment
  CHSC94321  Brickellia californica Lowell Ahart 2006-8-9 13110 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 422 Comment
  UCD55472  Brickellia californica Ellen Dean; Gordon Harrington 2006-10-6 3296 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 362 Comment
  IRVC29685  Brickellia grandiflora Mark A. Elvin, Mark S. Brunell, David Isle 2006-8-3 5033 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
  JEPS80803  Brickellia grandiflora L. R. Heckard and J. C. Hickman 1981-7-30 5773 A Colusa at e summit of ridge running e of (about 1.7 km. air miles from) West Peak (Snow Mt); Snow Mt. 2042 Comment
  CAS-BOT-BC127866  Brickellia greenei Mark A. Elvin; Mark S. Brunell; David Isle 2006-8-3 5034 Colusa Southern Northern Inner Coast Ranges: Snow Mtn; Summit Spring Trail; 1.4km W of Snow Mtn West summit; 800m N of Cedar Camp. 1989 Comment
  IRVC29684  Brickellia greenei Mark A. Elvin, Mark S. Brunell, David Isle 2006-8-3 5034 Colusa Snow Mtn; Summit Spring Trail; 1.4km W of Snow Mtn West summit; 800m N of Cedar Camp. Southern Northern Inner Coast Ranges 1989 Comment
  UCD82536  Briza maxima Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5688 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
  CHSC112031  Briza minor David Isle 1988-5-11 2100 Colusa Moon Glade (E of Trout Ck Trailhead) 1/2 mi W of Fouts Springs; Middle Fork Stony Creek Watershed, Mendocino National Forest. 621 Comment
  SEINET198872  Brodiaea capitata J. A. Riegel 1954-3-12 1 Colusa Above Cache Creek 6.8 miles northwest of Rumsey. Comment
  HSC3023  Brodiaea elegans subsp. elegans Annetta Carter 1953-6-20 3240 Colusa Near summit E of Hough Springs on Bartlett Springs Rd. Comment
  RSA724892  Bromus arenarius L. Ahart 2006-8-22 13216 Colusa south side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford. 349 Comment
  SBBG115860  Bromus arenarius B. Crampton 1958-5-19 4793 Colusa ca. 10.1 mi SE of Leesville, E of foothills known as Three Sisters Comment
  UCD37188  Bromus arenarius Beecher Crampton 1958-5-19 4793 Colusa Colusa County, 10.1 miles southeast of Leesville, east of foothills known as Three Sisters. Comment
  SEINET3921515  Bromus arenarius Beecher Crampton 1958-5-19 4793 Colusa Colusa County, 10.1 miles southeast of Leesville, east of foothills known as Three Sisters.; 0 Comment
  UCD66931  Bromus caroli-henrici Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5080 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Northwestern part of ranch, along ridge trail on border of Lake and Colusa Counties. South of junction with trail that heads down to the headwaters of Thompson Creek. 633 Comment
  CAS-BOT-BC155997  Bromus diandrus Roxana S. Ferris 1926-4-21 6277 Colusa Sycamore Slough 2 miles from Sycamore. Comment
  RSA163468  Bromus diandrus Roxana S. Ferris 1926-4-21 6217 Colusa On Sycamore slough, 2 miles from Sycamore Comment
  CAS-BOT-BC155496  Bromus hordeaceus Roxana S. Ferris 1917-4-12 527 Colusa 4 miles east of Williams. Comment
  UCD57554  Bromus hordeaceus Cindy Yip; with Plant Biology 102 2007-4-29 4 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Meadow on the west side of State Route 16, ca. 2 road miles south of intersection with State Route 20. 304 Comment
  POM92520  Bromus hordeaceus Roxana S. Ferris 1917-04 527 Colusa 4 miles east of Williams. Comment
  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
  UCD58884  Bromus laevipes Helen K. Sharsmith 1953-6-19 4266 Colusa Inner North Coast Ranges. Mendocino National Forest. Red Bridge Camp. Near confluence of North and Middle forks of Stoney Creek. 548 Comment
  UCD58941  Bromus laevipes R. Tofsrud 1948-7-1 s.n. Colusa Colusa Co. Comment
  UCD81719  Bromus laevipes Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5724 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
  UCR212307  Bromus laevipes Craig D. Thomsen 2001-5-24 2531 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
  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
  JEPS110259  Bromus pseudolaevipes Lowell Ahart 2006-6-11 12670 Colusa On the east side of an off road trail (Trail 30), about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford 613 Comment
  CAS-BOT-BC273300  Cacaliopsis nardosmia J. M. Tucker; John Tothill 1959-5-30 3527 Colusa Road between Goat Mountain Lookout and Upper Letts Valley (ca. 2 1/2 miles, airline, north of the lookout), Goat Mountain 1524 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
  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
  UCR73129  Calandrinia ciliata Mark Hershkovitz 1991-5-3 s.n. Colusa Bear Valley, along Bear Valley Rd. Near fenceline in central region of valley Comment
  HSC47509  Calandrinia ciliata Sheila Logan 1978-4-21 51 Colusa N of Bear Valley Rd. Comment
  UCD100196  Calandrinia ciliata Mark Hershkovitz 1991-5-3 s.n. Colusa Walker Ridge, along Walker Ridge Rd. nr. Turn-off to Bear Valley on north end; serpentine. Comment
  SEINET9097491  Calandrinia ciliata var. menziesii R. R. Halse 2010-3-20 7825 Colusa Along State Hwy 45 ca 10 miles N of Colusa (junction of State Hwys 45 & 20). 22 Comment
  CAS-BOT-BC167285  California macrophylla Roxana S. Ferris 1926-4-23 6406 Colusa Grade beyond the Mountain House on Williams - Stonyford Road Comment
  CHSC86517  California macrophylla B. Castro; Beth Hendrickson 2003-3-24 1398 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. On and along dirt road. 289 Comment
  UC1101520  Callitriche marginata S. Galen Smith and G. T. Robbins 1950-4-15 1906 Colusa Bear Valley Comment
  CHSC2225  Calochortus amabilis V. Holt 1946-4-18 Colusa Cache Creek. 243 Comment
  CHSC49642  Calochortus amabilis Vernon Oswald 1986-5-12 2007 Colusa Brim Rd, (Bartlett Springs Rd.) 1.8 mi w of Bear Valley Rd. 502 Comment
  UC843630  Calochortus amabilis Lewis S. Rose 1936-4-27 36196 Colusa 22 mi sw Williams 396 Comment
  UCR198059  Calochortus amabilis E. Jacqueline Garcia 1986-4-13 s.n. Colusa Bear Valley, 2.6 mi west of the junction of Bear Valley Road and Bartlett Springs Road, on Bartlett Springs Road 664 Comment
  CAS-BOT-BC492124  Calochortus amabilis Roxana S. Ferris 1926-4-23 6447 Colusa Grapevine grade between Stonyford and Sites 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
  SJSU9982  Calochortus luteus E. O. Haas 1956-5-12 69 Colusa Salt Creek c. 10 mi SW of Arbuckle Comment
  UCD57617  Calochortus luteus Jill Poloske; with Plant Biology 102 2007-4-29 1 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central part of ranch. Near the intersection of Thompson Canyon and Craig Canyon. West of spring, the headwaters of Craig Creek. 365 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
  CHSC112206  Calochortus splendens Lowell Ahart 2013-5-1 18683 Colusa Inner North Coast Range. On the north side of the wash, north side of State Highway 20, just east of Lake County Line, 12.2 mile (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  CHSC2243  Calochortus splendens D. Smith 1935-5-12 Colusa Stonyford Hills. Comment
  UC1562598  Calochortus splendens Barbara Ertter 1989-7-1 8600 Colusa ca 12 air mi wsw Stonyford (road to Goat Mt Lookout, 2.2 mi s of Rt M-10 (Bear Creek-Fouts Spring Rd), at head of South Fork Stony Creek, s.w. side of ridge); South Fork Stony Creek 1500 Comment
  UC1562881  Calochortus splendens Barbara Ertter 1989-7-1 8600 Colusa ca 12 air mi wsw Stonyford (road to Goat Mt Lookout, 2.2 mi s of Rt M-10 (Bear Creek-Fouts Spring Rd), at head of South Fork Stony Creek, s.w. side of ridge); South Fork Stony Creek 1500 Comment
  UCD82156  Calochortus splendens Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5688 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
  CAS-BOT-BC483485  Calochortus splendens Ella D. Cantelow 1957-5-31 s.n. Colusa 4 miles west of Leesville on grade above Bear Valley Comment
  JEPS80134  Calochortus tolmiei L. R. Heckard with J. Hickman 1980-7-2 5294 Colusa ca 10 mi w Stonyford (just above (ne of) Summit Springs, sw of Snow Mt. peaks, Colusa-Lake County boundary) 1584 Comment
  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
  UCD14317  Calochortus uniflorus H. Bebensee 1984-4-21 9 Colusa 9.8 miles north of Highway 20 along the east side of Bear Valley Road. Comment
  UCD82499  Calochortus uniflorus Craig Thomsen; G. Harrington 2009-5-12 2858 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  RSA789275  Calycadenia micrantha R. L. Carr 1994-9-23 2656 Colusa Wilson Camp, southwest of Stoneyford, near the Colusa/Lake County line, ca. 3 air miles southeast of Goat Mountain. 1400 Comment
  CAS-BOT-BC270758  Calycadenia pauciflora K. C. 1884-7-1 s.n. Colusa Mountain House Comment
  UCD129829  Calycadenia pauciflora Gerald D. Carr 1972-6-14 703 Colusa at the Lake County line on Highway 20. 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
  UCR44924  Calycadenia pauciflora L. F. LaPre 1986-5-30 s.n. Colusa Stony Creek Road, Mendocino Natl Forest 474 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-BC270749  Calycadenia pauciflora Gerald D. Carr 1971-7-29 607 Colusa 5.2 miles N of Stoneyford on road to Fout Springs 609 Comment
  CAS-BOT-BC270754  Calycadenia pauciflora Gerald D. Carr 1971-9-14 652 Colusa 3.6 miles SW of Leesville on Bartlett Springs Road 518 Comment
  RSA255558  Calycadenia pauciflora Gerald D. Carr 1972-7-29 720 Colusa 0.3 miles east of Lake County line on Bartlett Springs Road Comment
  RSA255613  Calycadenia pauciflora Gerald D. Carr 1971-9-14 652 Colusa 3.6 miles southwest of Leesville on Bartlett Spr. Road 518 Comment
  UC1971710  Calycadenia pauciflora 1978-8-20 2155 Colusa Brim Road (to Bartlett Springs), 1.5 mi W of jct with Bear Valley Road, ca. 3.6 mi SW of Leesville (=GDC 652) 482 Comment
  UC1971757  Calycadenia pauciflora R. L. Carr 1997-7-18 3352 Colusa E of Clearlake Oaks, 1.8 mi E of Lake/Colusa Co. line on Hwy 20 Comment
  UCD129840  Calycadenia pauciflora Gerald D. Carr 1972-8-2 723 Colusa 0.6 miles west of Leesville-Lodoga Road on road to Cook's Springs. Comment
  UCD129870  Calycadenia pauciflora R. L. Carr 1978-8-20 2155 Colusa Brim Road (to Bartlett Spring), 1.5 miles west of junction with Bear Valley Road, around 3.6 miles southwest of Leesville. 482 Comment
  UCD129895  Calycadenia pauciflora Gerald D. Carr 1971-9-15 658 Colusa 6.0 miles north of Yolo County line Hwy 16. Comment
  UCD63125  Calycanthus occidentalis Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4955 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20. 436 Comment
  UC1299369  Calyptridium monospermum Freed W. Hoffman 1948-6-26 2512 Colusa western Goat Mountain Goat Mountain Comment
  UCD68099  Calyptridium monospermum Kathleen A. Robson 1981-5-23 37 Colusa From Stonyford, take Fouts Spring Road 12 miles West, past Fouts Springs to Letts Lake, Mendocino National Forest. 1219 Comment
  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
  HSC41916  Calystegia collina subsp. collina M. A. Baker 1977-4-24 225 Colusa Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  HSC48190  Calystegia collina subsp. collina Thomas W. Nelson, Jane Nelson 1978-4-29 3965 Colusa Along Hwy. 20 just E of Colusa-Lake Co. line 549 Comment
  UCD163873  Calystegia collina subsp. collina Craig D. Thomsen 2000-5-11 2307 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 1.5 mile west of Hwy 20/16 instersection. Comment
  RSA394936  Calystegia collina subsp. collina Eugene Memmler 1969-5-8 106 Colusa Hwy 20, Between Williams and Clear Lake. 152 Comment
  CHSC70976  Calystegia collina subsp. oxyphylla Vernon Oswald; Lowell Ahart 1998-5-7 9000 Colusa Barlett Springs Rod. 2.1 mi west of Bear Valley Rd., 0.8 mi east of Sawtelle Valley and Grapevine Flat roads. 524 Comment
  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
  UC1614405  Camissonia Charles M. Belshaw 1937-4-25 2831 Colusa Inner North Coast Range, Cooks Springs, Devils Ridge Devils Ridge; Inner North Coast Range, Cooks Springs, Devils Ridge Comment
  HSC72149  Camissonia micrantha J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9562 Colusa Bear Valley Rd., 2.1 mi. from its junction with Hwy. 20 366 Comment
  CDA38025  Camissoniopsis hirtella Vernon H. Oswald & Lowell Ahart 1998-5-7 9004 Colusa Bartlett Springs Road, 2.1 miles west of Bear Valley Road, 0.8 mile east of Sawtelle Valley and Grapevine Flat Roads. Comment
  UCD37191  Camissoniopsis hirtella Beecher Crampton 1958-5-19 4807 Colusa 4-8 miles south of Lodoga, Little Stony Creek Canyon. 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
  UCD162983  Cardamine oligosperma Craig D. Thomsen 2002-2-7 2570 Colusa Bear Creek Botanical Management Area. Roadside shoulder of Hwy 20 (south side), about 0.3 mile west of Hwy 20/16 intersection. 345 Comment
  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
  CAS-BOT-BC17885  Carex angustata P. T. Zwanck 1964-4-28 s.n. Colusa On levee at water line, ca. 5 miles north of Colusa. Comment
  UC767029  Carex barbarae R. F. Hoover 1938-4-23 3210 Colusa Upper Sand Creek Comment
  JEPS63533  Carex barbarae W. L. Jepson 1934-7-28 14747 Colusa Cortina Velly, hills SE of Colusa county 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
  UC1563912  Carex bolanderi Barbara Ertter 1989-7-1 8607 Colusa road to Goat Mt. Lookout 1.7 mi s Rt. M-10 (Bear Creek-Fouts Spring Rd.) (at head of S Fk Stony Creek, ca. 12 air mi wsw of Stonyford); S. Fk. Stony Creek 1463 Comment
  CHSC94429  Carex densa Lowell Ahart 2006-8-22 13213 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  CHSC91548  Carex fracta Barbara L. Wilson; Richard Brainerd, David Isles, Lawrence Janeway 2002-6-28 10706 Colusa Ford Spring, on eastern end of Pine Ridge, overlooking Trout Creek; on Goat Mountain Road above the Trout Creek Bridge on the Pine Ridge grade, within 1/2 mile of Trout Creek. In roadside ditch. UTM: 10S 533575e 4343812n. 630 Comment
  JEPS75128  Carex fracta Alice Q. Howard 1972-7-10 7 Colusa n side of the ridge separating Trout Creek and Paradise Creek (the highest of two mossy spring areas crossing trail from Fouts Camp to Box Springs); Snow Mountain 1676 Comment
  UC1563913  Carex fracta Barbara Ertter 1989-7-1 8610 Colusa road to Goat Mt. Lookout 1.7 mi s Rt. M-10 (Bear Creek-Fouts Spring Rd.) (at head of S Fk Stony Creek, ca. 12 air mi wsw of Stonyford); S. Fk. Stony Creek 1463 Comment
  JEPS75122  Carex hoodii L. R. Heckard 1972-7-10 3114 Colusa Trout Creek crossing of trail to Box Spring; Snow Mt., Trout Creek 1828 Comment
  JEPS80866  Carex hoodii L. R. Heckard and J. C. Hickman 1981-7-31 5778 Colusa near Fouts Springs Overlook (e side of Snow Mt.); Snow Mt. 1798 Comment
  JEPS75123  Carex jonesii L. R. Heckard 1974-9-10 3913 Colusa ne slope of West Peak Snow Mt., West Peak 2072 Comment
  JEPS80857  Carex jonesii L. R. Heckard and J. C. Hickman 1980-9-16 5458 Colusa cirque area between peaks, ne slope of West Peak Snow Mt., West Peak 2011 Comment
  JEPS80275  Carex lenticularis var. impressa L. R. Heckard and J. Hickman 1980-9-16 5461 Colusa cirque area between peaks, ne slope of West Peak, Snow Mt. West Peak; Snow Mt., West Peak 2011 Comment
  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
  JEPS75131  Carex luzulina var. ablata L. R. Heckard 1974-9-9 3845 Colusa on slope in red fir-Jeffrey opening, just southeast of Foutch Camp; Snow Mt. 1889 Comment
  JEPS80879  Carex luzulina var. luzulina L. R. Heckard and J. C. Hickman 1980-9-16 5456 Colusa Northeast slope of West Peak, cirque area between peaks, Snow Mt. 2011 Comment
  JEPS80867  Carex pachystachya L. R. Heckard and J. C. Hickman 1981-7-31 5795 Colusa Dark Hollow Creek, e side of Snow Mt. Snow Mt., Dark Hollow Creek 1584 Comment
  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
  UCD63116  Carex praegracilis Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4947 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20. 398 Comment
  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
  JEPS81282  Carex serratodens L. R. Heckard and J. C. Hickman 1982-7-5 5893 Colusa s. side Snow Mt. (Summit Springs, slope below (s. of) area); Summit Springs 1500 Comment
  UCD82864  Carex serratodens Gordon Harrington 2008-4-13 78 Colusa BLM Payne Ranch. Slopes to the SW of junction of Hwy 16 and Hwy 20. E of unnamed creek (flowing now). Upstream from collection #77. 403 Comment
  UCD83755  Carex serratodens Ellen Dean; G. Harrington, K. Mawdsley, J. Shepard 2010-5-1 5952 Colusa Colusa County. Walker Ridge. Along Walker Ridge Road, Buck Flat. 875 Comment
  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
  UCR228280  Carex serratodens Ellen Dean, Gordon Harrington, Craig D. Thomsen, S. Harrison 2008-5-18 4946 Colusa Payne Ranch, owned by BLM, lands to the southwest of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20 399 Comment
  JEPS80854  Carex subfusca L. R. Heckard and R. C. Bacigalupi 1976-9-6 4443 Colusa ne side of Fouts Camp promontory Snow Mt., Fouts Camp promontory 1859 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
  UCD72514  Carex vulpinoidea Jack Alderson 2008-6-1 s. n. Colusa southwest of Williams, intersection of Walnut Drive and Stovall Road. Comment
  CAS-BOT-BC249071  Castilleja affinis Roxana S. Ferris 1917-4-19 574 Colusa 7 mi west of Arbuckle, Arbuckle - Rumsey Road Comment
  CHSC77956  Castilleja affinis subsp. affinis Beth Hendrickson; Jean Witzman 1999-3-17 Colusa Vicinity of Antelope Valley, Grapevine Creek, and Sites-Lodoga Road. 158 Comment
  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
  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
  UCD163329  Castilleja applegatei subsp. martinii Craig D. Thomsen 2009-5-3 2797 Colusa Walker Ridge. Vicinity of Walker Ridge Rd., 0.25 miles north of Hwy 20. Comment
  CHSC81307  Castilleja attenuata J. Trizzino 2001-3-31 16 Colusa Bear Valley Meadow along east side of Bear Valley Road. 396 Comment
  SBBG128982  Castilleja attenuata G. K. Helmkamp, E. A. Helmkamp 2011-4-1 17122 Colusa Antelope Valley, along Maxwell-Sites Rd, 1.8 mi SE of Sites 77 Comment
  UC76125  Castilleja attenuata Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  UCD163675  Castilleja attenuata Craig Thomsen 1999-4-15 1976 Colusa Bear Valley. About 5 miles north of Hwy 20, west of Bear Valley Rd. Comment
  UCR233448  Castilleja attenuata George K. Helmkamp, E. A. Helmkamp 2011-4-1 17122 Colusa Eastern Foothills North Coast Ranges, Antelope Valley, along Maxwell-Sites Road, 1.8 miles southeast of Sites 77 Comment
  CHSC27537  Castilleja exserta Greg C. Halcomb 1978-4-9 12 Colusa 5.1 mi w of Walker Ridge Rd., Hwy 20. 457 Comment
  UCD122410  Castilleja exserta Clinton C. Shock 1980-5-3 66 Colusa Bear Valley, about 12 miles northwest of Highway 20. 384 Comment
  UCD81230  Castilleja exserta Ellen Dean; K. Mawdsley, B. Rice 2009-5-6 5567 Colusa Payne Ranch, lands to the SW of the jct. of Hwys. 16 and 20. Along Bear Creek south of Brophy Canyon, near old access road that leaves Hwy. 16 near milepost 6. 218 Comment
  CDA32834  Castilleja exserta P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  HSC96792  Castilleja exserta subsp. exserta J. Carey, A. Hong, J. Leffingwell 1995-4-1 29 Colusa Bear Valley Rd., 1.2 mi. S of its junction with Brim Rd. 415 Comment
  JEPS124238  Castilleja exserta subsp. exserta Lowell Ahart 2015-4-1 20000 Colusa Inner North Coast Range. About 50 yards west of Bear Creek, about 6 miles south of Leesville, about 6 miles north of Highway 20. Comment
  JEPS124296  Castilleja exserta subsp. exserta Lowell Ahart 2015-4-10 20026 Colusa About 4 mile south of Lodoga. Comment
  SEINET3079797 Image available Castilleja exserta subsp. exserta L. Blackford, S. Branch, D. Malm 1988-4-17 73 Colusa 1.3 miles south of Bear Valley Rd. from corner of Brim Rd. and Bear Valley Rd. 396 Comment
  CHSC81309  Castilleja foliolosa L. P. Janeway; B. Castro 2001-4-18 7023 Colusa Vicinity of Grapevine Creek, Sites-Lodoga Road, and Scotties Spring. 274 Comment
  HSC72142  Castilleja foliolosa J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9574 Colusa Bear Valley Rd., 2.1 mi. from its junction with Hwy. 20 366 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
  JEPS124251  Castilleja foliolosa Lowell Ahart 2015-4-1 19988 Colusa Inner North Coast Range. 1/2 mile east of Lake County Line, 12 miles (air) east-northeast of Clear Lake (town), 17 miles (air) west of Williams. Comment
  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
  SEINET3873225  Castilleja foliolosa Richard R. Halse 2011-3-25 8160 Colusa Along State Hwy. 20 just east of the Lake County Line; ca 14.6 miles east of its junction with State Hwy. 53.; 0 558 Comment
  HSC97523  Castilleja foliolosa Maria-Elena Heizen 2001-4-21 25 Colusa Walker Ridge 671 Comment
  CHSC27625  Castilleja rubicundula subsp. rubicundula Timothy Spora; Robert Schlising 1978-5-13 3246 Colusa Ca 0.5 mi NW jct Hwy 20 and Bear Valley (= Wilber Springs) Road, along latter. 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
  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
  CDA11400  Castilleja tenuis G. F. Hrusa, K. van Katwyk 1995-4-22 12120 Colusa Inner North Coast Ranges; flat on Walker Ridge Road, approx. 6 m. S of intersection with Bartlett Springs Rd. Comment
  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
  UCD170130  Caulanthus lasiophyllus Jack Alderson 2016-5-1 s.n. Colusa BLM Bear Creek Ranch (formerly Payne Ranch); 2400 feet (730 m) west of the confluence of Brophy Creek with Bear Creek. 341 Comment
  UCD22472  Ceanothus cuneatus Brian Vanden Heuvel 2003-2-20 201 Colusa 6.7 miles west of Stonyford on Fouts Spring Road. Comment
  UCD33934  Ceanothus cuneatus Beecher Crampton 1975-4-21 9165 Colusa Colusa County, 4 miles N.N.E. of Lodoga, grapevine summit. 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
  HSC47467  Ceanothus integerrimus J. P. Smith, J. O. Sawyer 1978-4-29 9769 Colusa Walker Ridge Rd. 3.4 mi. from its jct. with Hwy. 20 Comment
  UCD170260  Ceanothus integerrimus D. O. Burge 2016-11-3 2185 Colusa Fouts Springs area, roadside on Forest Road M10, E of Fouts Springs. 630 Comment
  CAS-BOT-BC83779  Ceanothus jepsonii D. O. Burge; V. Church 2007-12-28 972 b Colusa Mendocino National Forest, roadside on Goat Mountain Road 430 Comment
  HSC90415  Ceanothus jepsonii C. Wilson, P. Kittelson, M. Hardig 1992-4-11 42 Colusa Walker Ridge Rd., 1.0 mi S of Blue Oak Recreation Site 76 Comment
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Aug 18 2014
  UCD112067  Ceanothus jepsonii D. Sanchez-Mata 1996-7-3 s.n. Colusa Williams. Walker Ridge. Wilburg Springs-Wintun Camp. 850 Comment
  UCD56664  Ceanothus jepsonii Sam Bledsoe 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. 576 Comment
  UCD56667  Ceanothus jepsonii Jack Alderson 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. 556 Comment
  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
  CAS-BOT-BC83782  Ceanothus jepsonii var. albiflorus D. O. Burge; Steven Kembel 2008-5-27 997 b Colusa Rathburn-Petray Mine complex, E of Eaton Springs 700 Comment
  CHSC79559  Ceanothus jepsonii var. albiflorus L. P. Janeway 2000-5-31 6775 Colusa Inner North Coast Ranges. On top of Hornet Nest Ridge, between Hornet Nest Spring and Hornet Nest Hill; about 6.4 km southwest of Stonyford. 884 Comment
  HSC98207  Ceanothus oliganthus var. sorediatus Steven Lagos 1974-5-4 43 Colusa 747 Comment
  UCD72460  Centaurea melitensis Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3794 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. Near north end of bridge, west side of creek. 281 Comment
  CDA36217  Centaurea solstitialis G. K. Helmkamp, E. A. Helmkamp 2009-5-2 14758 Colusa Inner North Coast Ranges; Along CA-16, 1.8 miles north of the Yolo County line. Comment
  UC73978  Centaurea solstitialis H. P. Chandler 1905-9-14 Colusa Princeton Comment
  POM53290  Centaurea solstitialis W. R. Mumma 1897-9-3 s.n. Colusa Grand Island Comment
  JEPS80256  Centaurium muehlenbergii L. R. Heckard and J. Hickman 1980-9-15 5434 Colusa n of Summit Springs (n side of road, Lake-Colusa County boundary); Snow Mt. 1539 Comment
  RSA135479  Centaurium trichanthum Volney Rattan 1884-1 s.n. Colusa Stony Creek. 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
  CHSC107285  Centromadia fitchii L. P. Janeway; B. Castro 2011-7-9 10505 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 1.5 km southeast of Funks Reservoir and 0.1-0.6 km northeast of Tehama-Colusa Canal. Generally natural area centered around a shallow ephemeral alkaline marsh and adjacent wetland swales. In an area that is not quite a vernal pool near the eastern boundary of the area. 49 Comment
  UCD163657  Centromadia parryi subsp. parryi Craig Thomsen 1998-6-10 1955 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCD63776  Centromadia parryi subsp. parryi Craig D. Thomsen 2008-5-31 2757 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 20 and 16. Cowboy Camp area, west side of Hwy 16, 1 mile south of Hwy 20. In meadow, west of public viewing area between Bear Creek and hillslopes to the west. 279 Comment
  CHSC107937  Centromadia parryi subsp. rudis B. Castro; L. Janeway 2011-7-9 1898 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; approximately 1 mi southeast of Funks Reservoir and 900 ft northeast of Tehama-Colusa Canal. Off northern edge of large +- alkaline marsh. 49 Comment
  CHSC84391  Centromadia parryi subsp. rudis Lowell Ahart 2003-8-15 10510 Colusa On the south side of Highway 20, about 1 mile southwest of Williams. 27 Comment
  CAS-BOT-BC279208  Centromadia pungens subsp. pungens A. A. Heller 1916-6-9 12391 Colusa Along the state highway near Colusa Comment
  CAS-BOT-BC279212  Centromadia pungens subsp. pungens David D. Keck 1933-5-30 2402 Colusa 1.8 miles west of Colusa on road to Williams Comment
  UC195398  Centromadia pungens subsp. pungens A. A. Heller 1916-6-9 12391 Colusa along the state hwy near Colusa 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
  UCD137756  Ceratophyllum demersum J. S. Jones 1926-7-16 s.n. Colusa Colusa. Comment
  UCD137767  Ceratophyllum demersum Franklin Raney 1957-9-3 s.n. Colusa Colusa. Comment
  UC1618010  Cercocarpus betuloides Donald G. Nelson 1940-6-8 679 Colusa w of Stoneyford (on e slopes of Snow Mountain, nw boundary of the county, trail several miles above Bonnie View); Snow Mountain 1066 Comment
  UCD58111  Cercocarpus betuloides Ellen Dean; G. Harrington and P. McIntyre 2007-3-16 3375 Colusa Payne Ranch. Along Hwy. 20, Destanella Flat area just E of Lake Co. border. Ca. 3.4 road miles west of junction with Hwy. 16. South side of road. East of Destanella. 576 Comment
  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
  JEPS81415  Chaenactis douglasii var. douglasii L. R. Heckard and J. C. Hickman 1982-7-9 6023 Colusa near summit of, Lookout Goat Mt. (Colusa-Lake Counties boundary) Comment
  UCD159334  Chaenactis glabriuscula D. S. Park; E. Dean 2010-6-5 118 Colusa Walker ridge, Cold Spring Mt. Exposed serpentine outcrop. 1032 Comment
  CHSC70964  Chaenactis glabriuscula var. heterocarpha Vernon Oswald; Lowell Ahart 1998-5-7 9011 Colusa Bartlett Springs Rd. 2.8 mi west of Bear Valley Rd., 0.1 mi east of Sawtelle Valley and Grapevine Flat roads. Roadside banks. 633 Comment
  HSC48143  Chaenactis glabriuscula var. heterocarpha Thomas W. Nelson, Jane P. Nelson 1978-4-30 3971 Colusa Along SR 20 just E of Colusa-Lake County line 549 Comment
  UC630425  Chaenactis glabriuscula var. heterocarpha Annetta Carter 1938-5-8 1394 Colusa 4 mi se of Wilbur Springs; Inner North Coast Ranges, Bear Creek Canyon Comment
  UC638668  Chaenactis glabriuscula var. heterocarpha Ethel Crum 1938-5-7 2014 Colusa 4.2 mi n of Rumsey; Inner North Coast Ranges, Comanche Hills 254 Comment
  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
  CHSC94311  Chamaesyce serpillifolia subsp. serpillifolia Lowell Ahart 2006-8-9 13104 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 422 Comment
  SBBG28500  Chamaesyce serpillifolia subsp. serpillifolia Mrs. H. P. Bracelin 1931-10-1 564 Colusa Indian Crk, ca. 7 mi N of Leesville 289 Comment
  UC535095  Chamaesyce serpyllifolia Mrs. H. P. Bracelin 1931-10-1 565 Colusa Indian Creek Lodoga Comment
  IRVC29631  Cheilanthes Mark A. Elvin, Mark S. Brunell, David Isle 2006-8-3 5027 Colusa Snow Mtn; Summit Spring Trail; 1.4km W of Snow Mtn West summit; 800m N of Cedar Camp. Southern Northern Inner Coast Ranges 1989 Comment
  JEPS87672  Cheilanthes covillei Vernon H. Oswald and Lowell Ahart 1994-4-6 6061 Colusa 1.2 mi sw of Digger Pine Flat (s of Stonyford, Goat Mt Rd at Sullivan Creek) 469 Comment
  UC1415295  Cheilanthes gracillima Dale E. Johnson and J. E. Eckenwalder 1974-6-2 127 Colusa ridge connecting E and W Peaks Snow Mt 2150 Comment
  RSA724893  Chenopodium album L. Ahart 2006-8-22 13221 -A Colusa south side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford. 349 Comment
  CHSC32207  Chenopodium hians James Jokerst 1980-8-7 1065 Colusa North Coast Range. Near Snow Mountain. Comment
  UCD168861  Chenopodium strictum var. glaucophyllum John Anderson 2015-1 s.n. Colusa about 0.5 mile north of Colusa Casino west of Highway 45. Comment
  JEPS80466  Chimaphila menziesii Alice Q. Howard 1972-7-10 8 Colusa wet mossy spring area crossing trail from Fouts Camp to Box Springs (highest of 2 areas on n. side of ridge separating Trout & Paradise Creeks); Snow Mt. 1676 Comment
  SFV10852  Chimaphila menziesii M. L. Vincent 1968-6-6 788 Colusa 1 mile east of sign of 16 miles to Stony Ford on trip back from Goat Mountain. 550 Comment
  UCD37231  Chloris gayana Beecher Crampton 1958-6-27 4980 Colusa Colusa County, 2.5 miles south of Grimes. Comment
  SEINET4565689  Chloris virgata M. J. Williams 1981-9-2 81- 162 -1 Colusa Near an almond orchard on Wisconsin Avenue, south of Arbuckle Comment
  CDA11411  Chorizanthe membranacea G. F. Hrusa, K. van Katwyk 1995-4-22 12132 Colusa Inner North Coast Ranges; Along Leesville Rd. at summit of ridge immed. E of N end of Bear Valley. Comment
  CHSC32967  Chorizanthe membranacea C. Macdonald; P. Powers, C. Raley, J. Spitler, D. Stamp 1980-4-19 52 Colusa Leesville Road, road from Leesville to Williams, 3.8 miles east of Leesville. Comment
  CHSC80410  Chorizanthe membranacea Caroline Warren; Jenny Marr 1998-5-4 Colusa Vicinity of Sites and Stone Corral Creek. 91 Comment
  CHSC86966  Chorizanthe membranacea B. Castro; Michelle Cedarborg 2003-5-6 1430 Colusa Vicinity of Logan Ridge, Sites Peak and Lurline Creek. 219 Comment
  CHSC92836  Chorizanthe membranacea D. Isle 2000-6-7 1244 Colusa Mendocino National Forest -- North Coast Ranges Little Stony Creek Watershed. 50 yards west of Little Stony Road (42). 382 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
  HSC65996  Chorizanthe membranacea D. Boyd, M. Eichelberger, Tim Messick, T. Ranker 1980-4-20 43 Colusa Leesville Rd. from Leesville to Williams, 3.8 mi. E of Leesville. 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-BC277955  Cirsium cymosum James Jokerst 1985-4-5 2228 Colusa Near Coyote Peak 608 Comment
  UCD66565  Cirsium cymosum Craig D. Thomsen 2001-5-24 2520 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  CDA1157  Cirsium cymosum T. C. Fuller 1958-5-27 3667 -A Colusa South of Highway 20, 1 mile west of junction with Highway 16. 0 Comment
  JEPS81288  Cirsium cymosum var. cymosum L. R. Heckard and J. C. Hickman 1982-7-5 Colusa s side Snow Mt. (Summit Springs, slope below (s of) area); , Summit Springs 1500 Comment
  UCD159335  Cirsium douglasii var. breweri D. S. Park; E. Dean 2010-6-5 119 Colusa Walker ridge, Cold Spring Mt. 886 Comment
  CDA15471  Cirsium occidentale var. venustum G. F. Hrusa, WTD 1998-6-19 14608 Colusa North Coast Ranges; Above upper Little Stony Creek. Goat Mtn. Rd. ~ 1.5 km. W of of campground. Comment
  CHSC86959  Clarkia affinis B. Castro 2003-4-10 1421 Colusa Vicinity of Logan Ridge, Sulphur Gap and Lurline Creek. In E-trending small side canyon tributary. 158 Comment
  UC762214  Clarkia affinis R. F. Hoover 1938-4-24 3231 Colusa below Sites; Stone Corral Canyon Comment
  UCD57561  Clarkia affinis Stephanie Castle; with Plant Biology 102 2007-4-29 4 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Meadow on the west side of State Route 16, ca. 2 road miles south of intersection with State Route 20. West side of Bear Creek, on small rise south of Craig Creek. 304 Comment
  UCD72458  Clarkia affinis Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3792 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. Near north end of bridge, west side of creek. 281 Comment
  CAS-BOT-BC164146  Clarkia concinna David D. Keck 1933-5-30 2401 Colusa 1 mile east of Lake County line, west of Wilbur Springs Comment
  RSA0020963  Clarkia concinna Joan Stewart 1998-6-10 758 Colusa Bear Valley 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
  UCD66707  Clarkia concinna subsp. concinna Craig D. Thomsen 2001-5-24 2503 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.17 and 2.25. 342 Comment
  RSA0060004  Clarkia concinna subsp. concinna G. R. Campbell 1948-6-18 654 Colusa 2 miles west of junction of Highway 16 and Highway 20 Comment
  SBBG4972  Clarkia gracilis H. and M. Dearing 1939-5-12 3330 Colusa 20 mi N of Williams Comment
  CAS-BOT-BC164526  Clarkia gracilis subsp. albicaulis A. A. Heller 1916-6-6 12354 Colusa Coast Range on the grade about 3 miles west of Leesville Comment
  JEPS105736  Clarkia gracilis subsp. albicaulis David Gowen 2004-5-18 88 Colusa South of Stonyford. Approx. 7/10 mile along Goat Mt. Road from its junction with the paved road to Stonyford. Comment
  UC1053452  Clarkia gracilis subsp. gracilis Rimo Bacigalupi, Arthur Holmgren 1950-4-26 3169 Colusa 7.7 mi w Sites (Grapevine Grade to Lodoga) 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
  UCD70216  Clarkia gracilis subsp. tracyi D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. 370 Comment
  UC903259  Clarkia modesta Ethel Crum 1932-5-7 1462 Colusa Lodoga Inner North Coast Ranges Comment
  UCD104881  Clarkia purpurea Karen Rose 1985-4-13 4 Colusa Salt Canyon, N side of Salt Creek, Highway 20, 11 miles WSW of Williams. 143 Comment
  JEPS43724  Clarkia purpurea subsp. purpurea Alice King 1906-1-1 Colusa College City 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
  UCR257973  Clarkia purpurea subsp. quadrivulnera Craig D. Thomsen, Gordon Harrington 2009-5-12 2840 Colusa Walker Ridge. Eaton Springs, c. 1 mi east of Walker Ridge Road 707 Comment
  CHSC72453  Clarkia rhomboidea L. P. Janeway; Dave Isle 1998-7-3 5707 Colusa Along Pacific Ridge Road (16N06) 0.5 mi east of road to Spanish Ridge and Hough Springs; about 50 ft below ridge top on north-facing slope. On road cutbank. 1051 Comment
  CAS-BOT-BC164757  Clarkia rhomboidea Freed W. Hoffman 1948-6-28 2541 Colusa Between Upper and Lower Letts valleys Comment
  CDA14915  Claytonia exigua G. F. Hrusa 1993-5-2 10855 Colusa North Coast Ranges; Frenzel Creek Research Natural Area. Mendocino National Forest. Mouth of Frenzel Creek. Comment
  CAS-BOT-BC439113  Claytonia exigua subsp. exigua James Jokerst 1985-4-5 2207 Colusa Near Coyote Peak. 456 Comment
  RSA614426  Claytonia exigua subsp. exigua K. L. Chambers 1988-3-24 5405 Colusa Hwy 20., ca. 22 mi. west of Williams, Inner Coast Range. Comment
  SBBG106814  Claytonia exigua subsp. exigua K. L. Chambers 1988-3-24 5405 Colusa Hwy 20 ca. 22 mi W of Williams Comment
  UCD162997  Claytonia parviflora Craig D. Thomsen 2000-3-31 2086 Colusa Bear Creek Botanical Management Area. Roadside shoulder of Hwy 20 (south side), about 0.2 mile west of Hwy 20/16 intersection. 345 Comment
  UCD66466  Claytonia parviflora Craig D. Thomsen 2001-4-12 2458 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  JEPS87662  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
  JEPS97385  Claytonia parviflora subsp. parviflora Vernon H. Oswald and L. Ahart 1994-4-6 6055 Colusa T17N R6W NW1/4 Sec. 31, 1520 ft, Chaparral. Goat Mtn. Rd. 0.1 mi NE of Digger Pine Flat, S of Stonyford 463 Comment
  RSA590192  Claytonia parviflora subsp. parviflora Michael A. Vincent, Robert M. Rhode 1996-3-30 7285 Colusa Along Bear Valley Rd. above Bear Creek, 1.4 mi. S jct. Wilbur Springs Rd. Comment
  UCD56942  Claytonia perfoliata Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3544 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Thompson Canyon. 349 Comment
  UCD66965  Claytonia perfoliata Ellen Dean; Davis Botanical Society 2008-5-31 5009 Colusa west of I-5 at Maxwell, east slope of Goat Mountain, along Goat Mountain Road, Cedar Grove Campground. 1311 Comment
  SEINET199005  Claytonia saxosa H. K. Sharsmith 1953-6-20 4292 Colusa Mendocino National Forest ; Summit of Goat Mt. Lake-Colusa boundary 1864 Comment
  UCD67098  Claytonia saxosa Ellen Dean; Davis Botanical Society 2008-5-31 5026 Colusa west of I-5 at Maxwell, Goat Mountain, ridge below summit off of Goat Mountain Road. 1734 Comment
  CHSC55589  Collinsia grandiflora Jennie J. Dubose 1991-4-6 20 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
  UCD81721  Collinsia greenei Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5725 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones Spring area on W side of road, ca. 6.5 road mi N of junction with Hwy 20. W side of road. 833 Comment
  CHSC9540  Collinsia heterophylla L. V. Ritter 1969-4-30 222 Colusa Ca. 10 mi sw of Williams, s side of Hwy 20. Comment
  JEPS7323  Collinsia heterophylla Alice King Apr 1906 Colusa College City Comment
  UCD66532  Collinsia heterophylla Craig D. Thomsen 2003-5-30 2257 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
  UCR212362  Collinsia heterophylla Craig D. Thomsen 2000-4-12 2139 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mi west of Hwy 20/16 intersection, milepost 3.00 310 Comment
  CDA34126  Collinsia heterophylla P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  UC204795  Collinsia rattanii Volney Rattan 1884-6-15 Colusa w slope of Black Butte Black Butte Comment
  UCD82370  Collinsia sparsiflora Robin McMaster 1973-4-15 343 Colusa 0.5 mi towards Bartlett Springs from Bear Valley Road. Comment
  CHSC48984  Collinsia sparsiflora var. arvensis Vernon Oswald 1983-3-28 223 Colusa About 3.2 mi s of Stonyford on the Lodoga-Stonyford Rd. 365 Comment
  CHSC70908  Collinsia sparsiflora var. arvensis Vernon Oswald; Lowell Ahart 1998-4-21 8946 Colusa Stonyford-Lodga Rd. 4.2 mi south of Stonyford. 384 Comment
  CHSC77468  Collinsia sparsiflora var. arvensis Vernon H. Oswald 2000-3-29 9905 Colusa Hwy. 20 600 ft west of Bear Creek, 0.25 mi west of Hwy. 16. 323 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
  JEPS15270  Collinsia sparsiflora var. collina Rimo Bacigalupi with G. T. Robbins, G. L. Stebbins, C. McMillan, S. Galen Smith and Peter Kamb 1950-4-16 3114 Colusa 4 mi s Ladoga (and 6 mi nnw of Leesville, along Little Indian Creek); Indian Valley, Little Indian Creek 396 Comment
  JEPS81380  Collinsia torreyi var. wrightii L. R. Heckard and J. C. Hickman 1982-7-8 5991 Colusa trail from saddle between E and W Peaks towards Signal Peak, Snow Mt. Snow Mt. 2042 Comment
  CAS-BOT-BC230058  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
  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
  HSC42333  Collomia diversifolia M. A. Baker 1977-4-24 223 Colusa Walker Ridge Rd. above Barrel Springs Campground 701 Comment
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Jul 31 2014
  JEPS94201  Collomia diversifolia Vernon Oswald and Lowell Ahart 1998-5-7 9006 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
  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
  UCD73112  Conium maculatum Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3826 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. West side of Bear Creek, ca. 0.25 mile downstream of bridge. 246 Comment
  CHSC13499  Convolvulus arvensis L. V. Ritter 1969-4-30 217 Colusa Ca 6 mi. sw of Williams, w side of Highway 20. Comment
  CHSC67606  Cordylanthus palmatus James D. Jokerst 1988-8-23 3036 Colusa Delevan National Wildlife Refuge S of Willows, in Cell 12. Comment
  JEPS83552  Cordylanthus palmatus R. D. Stone 1987-8-26 850 Colusa w side of Ohm Rd ca 0.5 mi n jct. w/ Ware Rd.; Colusa Nat'l Wildlife Refuge, Arbuckle 7.5' quad. 13 Comment
  RSA0084707  Cordylanthus palmatus Ellen Cypher 2004-9-9 2004 -018 Colusa Delevan National Wildlife Refuge, Tract 33, CNDDB EO# 20 17 Comment
  RSA516504  Cordylanthus palmatus R. D. Stone 1987-8-29 850 Colusa Corner of Colusa Nat'l Wildlife Refuge, W side of Ohm Road, 0.5 mile N of its jct. with Ware Road. 14 Comment
  UC2042496  Cordylanthus pilosus Holly Forbes and Barbara Keller 2009-7-1 Colusa Walker Ridge Rd about 6.2 mi. N of junction with Highway 20. Comment
  JEPS80717  Cordylanthus pilosus subsp. pilosus L. R. Heckard and J. C. Hickman 1981-7-28 5677 Colusa 3.7 km e Ladoga Bridge (w of Maxwell, along roadside) Comment
  JEPS68402  Cordylanthus pilosus subsp. pilosus L. R. Heckard 1972-7-10 3146 Colusa above Happy Camp (e end of Snow Mt.) 731 Comment
  JEPS75706  Cordylanthus pilosus subsp. pilosus L. R. Heckard and R. Bacigalupi 1976-9-6 4456 Colusa 6 airmiles se Fouts Springs (along road to Summit Springs, below and w of Summit Springs, 1 mi n of junction with Stoneyford Rd., Colusa-Lake County line); Snow Mt. 1219 Comment
  RSA500440  Cordylanthus pringlei Vernon H. Oswald 1989-4-12 4008 Colusa Goat Mtn Rd. 2.1 mi wsw of Lodoga-Stonyford Rd, ca. 6 mi (air) s of Stonyford. On the n side of Little Stony Creek. 412 Comment
  UCD123114  Cordylanthus pringlei A. M. Shapiro 1994-8-16 s.n. Colusa Letts Valley Road, Canyon of Stony Creek. 1432 Comment
  UCD123116  Cordylanthus pringlei Craig Thomsen; Art Shapiro 2004-9-16 s.n. Colusa along Cool Springs Road. Comment
  UCD123117  Cordylanthus pringlei Craig Thomsen; Art Shapiro 2004-9-16 s.n. Colusa along Cool Springs Road. Comment
  JEPS95819  Cornus sericea subsp. occidentalis Vernon H. Oswald and L. Ahart 1999-6-22 9777 Colusa Lily Pond near Upper Letts Lake west of Stonyford: T17N R8W Sect. 24, ca. 4080 ft, mixed coniferous forest. Twigs of a shrub ca. 3 m tall growing in wet soil along the edge of the meadow at the Lily Pond. 1243 Comment
  CHSC53932  Cotula coronopifolia Vernon H. Oswald 1991-4-21 4524 Colusa Two Mile Rd, 3.7 mi south of Maxwell Colusa Rd. Along road through rice fields. 27 Comment
  CHSC60648  Cotula coronopifolia Vernon H. Oswald 1993-4-14 5266 Colusa S side of the Tour Route just W of Headquarters, Colusa National Wildlife Refuge, SW of Colusa. Bordering a pond. 18 Comment
  SD225728  Cotula coronopifolia Carol Witham, Jennifer Buck 2001-4-30 158 Colusa 2 mi. south of the town of Colusa along Hwy 20, east of Hwy 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001 Comment
  RSA0096943  Crassula connata R. R. Halse 2010-3-20 7827 Colusa Williams. By junction of 5th Street and B Street. 25 Comment
  UCD101846  Crassula connata Sam Olusuyi 1967-4-29 37 Colusa Bear Valley, 4.3 miles north of junction of State Highway 20 and Wilbur Springs Road. 396 Comment
  UC1221796  Crepis intermedia Beecher Crampton 1958-5-19 4803 Colusa 5.5 mi s Lodega 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
  POM66160  Cressa truxillensis Roxana Stinchfield 1916-7-11 143 Colusa Willaims Road at theTrough Comment
  UCD18838  Cressa truxillensis Vernal Pool Team 2001; Carol Witham and Jennifer Buck 2001-4-30 145 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
  CHSC61424  Croton setiger Vernon H. Oswald 1993-8-16 5805 Colusa Sacramento National Wildlife Refuge. Refuge located ca. 7 mi S of Willows, W1/4 of Tract 44, near the S boundary of the refuge. Field on the N side of Hunters Creek. 24 Comment
  CHSC113136  Crypsis alopecuroides Lowell Ahart 2013-10-1 19075 Colusa Inner North Coast Range. Strand of East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  CHSC52702  Crypsis schoenoides James Jokerst 1985-4-24 2494 Colusa Near Lurline Creek. 41 Comment
  CHSC77404  Crypsis schoenoides Heidi West; Joyce Lacey-Rickert 1998-10-29 Colusa Vicinity of Antelope Valley and Sites. 109 Comment
  CHSC84961  Crypsis schoenoides Lowell Ahart 2003-10-23 10675 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
  JEPS120801  Crypsis schoenoides Lowell Ahart 2013-10-1 19076 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
  UCD59814  Crypsis schoenoides H. L. Mason 1945-7-11 12642 Colusa Near Butte Creek; Butte Lodge Outing Club, 3 miles above Colusa. Comment
  CHSC115632  Crypsis schoenoides David Isle; Rhonda Isle 2014-9-27 2145 Colusa Northern Sacramento Valley foothills: W side East Park Reservoir, ~0.3 mi S of boatlaunch; within ~ 20 yards of normal lake edge in drying clay soil. (Gilmore Peak California: 10S -0541629E, 4355225N). 353 Comment
  RSA126602  Crypsis vaginiflora H. S. Yates 1936-8-14 6131 Colusa Three miles south of Colusa. 15 Comment
  UCD59989  Crypsis vaginiflora H. S. Yates 1936-8-14 6131 Colusa 3 miles south of Colusa. 15 Comment
  UCD84442  Cryptantha Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6047 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
  JEPS90300  Cryptantha flaccida Dean W. Taylor 1992-4-16 12408 Colusa on hillsides 0.4 mi due w from spillway into Little Stony Creek (East Park Reservoir); Inner North Coast Range, East Park Reservoir 411 Comment
  UC1053453  Cryptantha flaccida Rimo Bacigalupi and Arthur Holmgren 1950-4-26 3168 Colusa 8 mi nw Maxwell (along road to Sites, through first hills on extreme w edge of the Sacramento Valley); Sacramento Valley Comment
  UC78716  Cryptantha flaccida T. S. Brandegee Apr 1889 Colusa Leesville Comment
  HSC3611  Cryptantha hispidula Leo Koch 1940-4-29 936 Colusa Near Lake and Colusa county line along Hwy. 20, Williams Hwy. Comment
  POM311071  Cryptantha hispidula Leo Koch 1940-4-29 936 a Colusa Serpentine hill near Lake and Colusa county line along highway 20, Williams Highway. Comment
  UC763082  Cryptantha hispidula R. F. Hoover 1941-5-2 4983 Colusa just e Lake County line (on Williams-Clear Lake highway) Comment
  UC857088  Cryptantha hispidula Alice Eastwood and John Thomas Howell 1938-5-16 5632 Colusa Lake-Colusa county on road to Williams Comment
  UC971694  Cryptantha hispidula Leo F. Koch 1940-4-29 936 a Colusa near Colusa and Lake county line (along Highway 20, Williams Highway) Comment
  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
  CHSC146  Cryptantha intermedia V. Holt 1935-5-17 Colusa Stonyford. Comment
  UC857152  Cryptantha intermedia Alice Eastwood and John Thomas Howell 1938-5-16 5629 Colusa Lake-Colusa county line on road to Williams Comment
  UC971695  Cryptantha intermedia Leo Koch 1940-4-29 936 b Colusa near Lake and Colusa County (along Highway 20; Williams Highway) Comment
  UCD61451  Cryptantha intermedia Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3895 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
  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
  UCD119838  Cryptantha intermedia Beecher Crampton 1958-5-19 4820 Colusa Little Stony Creek Canyon. Comment
  UCD37192  Cryptantha intermedia Beecher Crampton 1958-5-19 4820 Colusa Colusa County, 4-8 miles south of Lodoga, Little Stony Creek Canyon. Comment
  SDSU20616  Cryptantha intermedia var. intermedia Ronald B. Kelley 2008-5-6 1540 Colusa On north side of Bear Valley Road in Bear Valley, 5.8 miles south of Brim Road junction. 387 Comment
  UC726039  Cryptantha microstachys A. A. Heller 1940-6-7 15713 Colusa ridge e of Lodogo (just above the road leading to Sites) Comment
  UCD84450  Cryptantha muricata Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6058 Colusa Walker Ridge. Along Walker Ridge Rd, E side of road in turnout. Just past Pinus attenuata groves. 981 Comment
  UC78651  Cryptantha nemaclada Katharine Curran 1884-1 Colusa Comment
  UC78654  Cryptantha rostellata Katharine Curran May 1884 Colusa Leesville Comment
  UC1299423  Cryptantha simulans Freed W. Hoffman 1947-6-19 1620 Colusa road from Stonyford to Fouts Springs (w Colusa County); North Coast Ranges Comment
  CHSC32209  Cryptantha torreyana James Jokerst 1980-8-7 1064 Colusa North Coast Ranges. Near Snow Mountain (west). Ridge top. Comment
  CHSC47984  Cryptantha torreyana Vernon Oswald 1986-6-30 2177 Colusa Northwest side of Lily Pond near Letts Lake. Roadway. 1188 Comment
  UCD66964  Cryptantha torreyana Ellen Dean; Davis Botanical Society 2008-5-31 5008 Colusa west of I-5 at Maxwell, east slope of Goat Mountain, along Goat Mountain Road, Cedar Grove Campground. 1311 Comment
  UC1051501  Cryptantha torreyana Helen K. Sharsmith 1953-6-19 4282 Colusa near Trough Springs (on Trough Springs Ridge); Inner North Coast Ranges, Mendocino National Forest 975 Comment
  CHSC91063  Cupressus macnabiana D. Isle 1996-11-26 190 Colusa Mendocino National Forest--North Coast Ranges. Bear Creek Watershed. 1.1 mi so. of jct. of Lovelady 4x4 Rd. with portion of 24N02, on east side of 24N02, near Kanaka Glade. 1018 Comment
  JEPS13746  Cupressus macnabiana Frank W. Gould 1939-4-8 631 Colusa 1.5 mi w of Colusa County line (on road to Lucerne) Comment
  UCD110851  Cupressus macnabiana Christopher Mallek 2008-1 WR- 1 Colusa Walker Ridge. Border of Colusa and Lake Counties. 802 Comment
  CHSC62835  Cupressus sargentii Vernon H. Oswald; Lowell Ahart 1994-3-23 6010 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
  RSA17616  Cupressus sargentii C. B. Wolf, E. R. Johnson 1934-10-15 6189 Colusa Cooks Springs, western part of county 549 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
  UCD125755  Cuscuta brachycalyx Beecher Crampton 1961-7-20 5935 Colusa 4 miles SE of Grimes, along Knight's Landing Road. Comment
  SBBG115554  Cuscuta californica var. californica B. Crampton 1961-7-20 5935 Colusa 4 mi SE of Grimes, along Knight's Landing Rd Comment
  UCD163659  Cuscuta indecora var. indecora Craig Thomsen 1998-6-10 1957 Colusa Bear Valley. About 8.5 miles north of Hwy 20. Comment
  UCD126319  Cuscuta indecora var. indecora Herbert L. Mason; Verne Grant 1946-8-6 12974 Colusa 2.7 miles north of Colusa between Sacramento River and Butte Creek. Comment
  UCR152111  Cynodon dactylon Beecher Crampton 1958-6-26 4975 Colusa 5.5 mi south of College City, just NE of Hershey Railroad siding; Grieve Road (Country Road 88) Comment
  CHSC62839  Cynoglossum grande Vernon H. Oswald; Lowell Ahart 1994-3-23 6023 Colusa Little Stony Creek just W of Digger Pine Campground on Goat Mtn. Rd., S of Stonyford. On slopes along the creek. 490 Comment
  RSA0060513  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
  UCD61465  Cynosurus echinatus Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3911 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 1.5 miles SW of parking lot in Eula Canyon. 310 Comment
  UCD63773  Cynosurus echinatus Craig D. Thomsen 2008-5-23 2753 Colusa BLM Payne Ranch. Southwest of intersection of Hwy 16 and Hwy 20. About 1 mile south of Hwy 20 (south of Destanella Flat) and 2.5 miles west of Hwy 16. 420 Comment
  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
  RSA40155  Cyperus difformis J. T. Howell 1944-7-18 19838 Colusa 3 miles west of Williams 30 Comment
  UC710614  Cyperus difformis John Thomas Howell 1944-7-18 19838 Colusa 3 mi. w. Williams 30 Comment
  UCD141008  Cyperus difformis John Thomas Howell 1944-7-18 19838 Colusa 3 miles west of Williams. Comment
  UCD141020  Cyperus difformis June McCaskill 1954-8-9 362 Colusa ca. 2 mi. east of Princeton and 400 yds. south of Glenn County line. Comment
  CHSC94430  Cyperus eragrostis Lowell Ahart 2006-8-22 13209 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UC1100527  Cyperus eragrostis Herbert L. Mason and Verne Grant 1946-9-5 13117 Colusa 1.6 mi. w. Williams (rd. to Lake Co.) Comment
  CAS-BOT-BC114385  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
  UC1100515  Cyperus erythrorhizos Herbert L. Mason and Verne Grant 1946-8-13 13012 Colusa 2 mi. w. Colusa (on Williams hwy. by gridge); Butte Sink Comment
  UC1100516  Cyperus erythrorhizos Herbert L. Mason and Verne Grant 1946-8-7 12984 Colusa 8 mi. n. Colusa (Butte Sink); Butte Sink Comment
  UC1100519  Cyperus erythrorhizos Herbert L. Mason 1945-9-19 12724 Colusa 1 mi. n. Colusa (e. bank Sacramento R., below causeway over Butte Sink spillway,); Sacramento R. Comment
  UCD141054  Cyperus erythrorhizos H. L. Mason 1945-9-19 12724 Colusa 1 mile N of Colusa. Below causeway over Butte Sink spillway, E bank of Sacramento River. Comment
  CHSC94790  Cyperus odoratus Lowell Ahart 2006-9-26 13356 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
  POM313098  Cyperus odoratus H. L. Mason 1945-9-19 12721 Colusa Below caus[e]way over Butte Sink spillway, East bank of Sacramento River, 1 mile north of Colusa. Comment
  JEPS73451  Cystopteris fragilis L. R. Heckard 1972-7-8 3048 Colusa n side ridge running se of Snow Mt (West Peak) 2011 Comment
  CHSC80454  Damasonium californicum Caroline Warren; Jenny Marr, Heidi West 1998-7-1 Colusa Vicinity of Peterson Road and Funks Creek. 91 Comment
  UCD35946  Damasonium californicum Beecher Crampton 1953-4-29 1148 Colusa 7 miles east of Maxwell. Comment
  CHSC75705  Datisca glomerata Vernon H. Oswald; Lowell Ahart 1999-6-22 9787 Colusa 2.2 mi west of Stonyford-Lodoga Road on County Road 42 paralleling Little Stony Creek. 426 Comment
  UCD57616  Datisca glomerata Jill Poloske; with Plant Biology 102 2007-4-29 3 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central part of ranch. Thompson Canyon. In bed of Thompson Creek. 304 Comment
  JEPS110408  Datura wrightii Lowell Ahart 2006-8-22 13205 Colusa At the intersection of Sites Lodoga Road and a dirt road to Elk Creek, about 1 1/2 miles (air) east of East Park Reservoir, about 4 1/2 miles (air) northeast of Lodoga 545 Comment
  JEPS121115  Daucus pusillus Lowell Ahart 2013-5-1 18675 Colusa On the N side of the wash, N side of Hwy 20, just E of Lake County line, 12.2 air miles ENE of the town of Clear Lake, 17.1 air miles W of Williams. Comment
  UCD57059  Daucus pusillus Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3653 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
  UCD63774  Daucus pusillus Craig D. Thomsen 2008-5-23 2754 Colusa BLM Payne Ranch. Southwest of intersection of Hwy 16 and Hwy 20. About 1 mile south of Hwy 20 (south of Destanella Flat) and 2.5 miles west of Hwy 16. 420 Comment
  UC424843  Delphinium antoninum unknown 1929-7-1 3509 b Colusa between peaks Snow Mt. 2133 Comment
  CHSC86969  Delphinium hesperium subsp. pallescens B. Castro 2003-5-14 1434 Colusa Vicinity of Logan Ridge, Sulphur Gap and Lurline Creek. 158 Comment
  HSC45441  Delphinium hesperium subsp. pallescens M. Alcasas 1978-4-23 58 Colusa Bartlett Springs Rd., 0.5 mi. from junction with Bear Valley Rd 457 Comment
  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
  HSC71332  Delphinium patens Thomas W. Nelson, Jane P. Nelson 1979-4-11 4613 Colusa Along Leesville to SR 20 cutoff 5 mi. E of Leesville Comment
  CAS-BOT-BC17043  Delphinium recurvatum A. A. Heller 1940-5-6 15574 Colusa State Highway #20, about 3 miles east of the junction with Highway #16. Comment
  CAS-BOT-BC17044  Delphinium recurvatum Mrs. H. C. Cantelow 1936-4-11 1208 Colusa Bear Creek Canyon. Comment
  CAS-BOT-BC17110  Delphinium uliginosum D. E. Breedlove 1963-5-30 5184 Colusa 17 miles E of Bartlett Springs Comment
  CAS-BOT-BC33189  Delphinium uliginosum M. K. Curran 1884-7-1 s.n. Colusa Epperson's Comment
  CHSC46049  Delphinium variegatum June McCaskill 1962-5-2 651 Colusa Ca. 200 yards west of road; on road along Bear Creek from State Highway 20 north to Leesville, 3.6 miles north of Wilbur Springs turnoff. Comment
  CHSC69829  Delphinium variegatum June McCaskill 1962-5-2 651 Colusa Ca. 200 yards west of road; on road along Bear Creek from State Highway 20 north to Leesville, 3.6 miles north of Wilbur Springs turnoff. Comment
  UCR47948  Delphinium variegatum C. Pauls 1975-4-20 4 Colusa Bear Valley Rd., 8.7 mi north of State Hwy 20 Comment
  CDA32828  Delphinium variegatum P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  RSA158040  Delphinium variegatum June McCaskill 1962-5-2 651 Colusa Colusa County: road along Beaar Creek from Hwy 20 N to Leesville, 3.6 miles N of Wilbur Springs turnoff 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
  SEINET5338170  Delphinium variegatum W. Roderick 1967-5-7 s.n. Colusa Bear Valley. 305 Comment
  UCD15427  Delphinium variegatum Margit Sands 1985-4-13 30 Colusa in Bear Valley, 7.4 miles north of Wilbur Hot Springs rd.; 390 Comment
  UCD18512  Delphinium variegatum Roman Gaukin 1958-5-4 s.n. Colusa Bear Valley. Comment
  CHSC1465  Delphinium variegatum subsp. variegatum 1946-4-18 Colusa Cache Creek. Comment
  CHSC89827  Delphinium variegatum subsp. variegatum B. Castro; L. Janeway 2001-5-2 1244 Colusa Vicinity of Grapevine Creek, Antelope Creek, and Pence Mtn. In flat to undulating open grazed grassland between hills of blue oak woodland. Adjacent to dirt road paralleling N-S-trending creek. 335 Comment
  UC1093630  Delphinium variegatum subsp. variegatum Francia Chisaki, Gene B. Newcomb 1958-4-1 1103 Colusa On road to Lodoga, 6.6 miles North of junction with Highway #20 Comment
  CAS-BOT-BC16954  Delphinium variegatum subsp. variegatum L. S. Rose 1936-4-27 36177 Colusa 10 mi. NW of Rumsey 213 Comment
  CAS-BOT-BC192668  Deschampsia danthonioides Doris K. Kildale 1928-5-8 5019 Colusa 3 miles south of Arbuckle Comment
  CAS-BOT-BC192670  Deschampsia danthonioides A. A. Heller 1902-5-1 5435 Colusa Near College City Comment
  CHSC107972  Deschampsia danthonioides B. Castro; Robin Carter, Jessica Boyt 2011-4-25 1855 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; ca 5 air mi NW of Maxwell, 0.8 mi southeast of Funks Reservoir and 0.3 mi northeast of Tehama-Colusa Canal. Towards north end of vernally moist swale which extends northeast of large +- saline/alkaline wetland/marsh, in drying vernapool bottom. 49 Comment
  SEINET10524208  Deschampsia danthonioides A. Arthur Heller 1902-5-1 Heller 5435 Colusa Near College City. Comment
  UCD164163  Descurainia sophia Craig Thomsen 2008-3-20 2719 Colusa Payne Ranch (Bear Creek Ranch) BLM. Hwy 16 about 0.25 mile south of junction with Hwy 20. Comment
  CAS-BOT-BC402210  Dicentra chrysantha A. A. Heller 1940-6-5 15713 a Colusa Near the foot of the grade east of Lodogo, on the Lodogo-Sites road Comment
  CHSC79752  Dicentra chrysantha L. P. Janeway; B. Castro 2000-5-1 6686 Colusa Vicinity of Grapevine Creek and Sites-Lodoga Road. 243 Comment
  JEPS80089  Dicentra formosa L. R. Heckard with J. Hickman 1979-6-16 5097 Colusa s of Milk Ranch (nw of West Peak, Snow Mt.); Snow Mt. 2011 Comment
  JEPS80086  Dicentra uniflora L. R. Heckard with J. Hickman 1979-6-16 5093 Colusa about 0.5 mi s Milk Ranch (nw of Snow Mt. West Peak) 2011 Comment
  UC1093627  Dichelostemma capitatum Francia Chisaki and Gene B. Newcomb 1958-4-1 1098 Colusa 0.7 mi nw Highway 20 junction with road to Lodoga (on road to Lodoga) Comment
  CAS-BOT-BC500074  Dichelostemma capitatum Roxana S. Ferris 1917-4-12 521 Colusa 4 mi east of Williams. Alkali Plains. Comment
  JEPS80436  Dichelostemma capitatum L. R. Heckard, and J. Hickman 1980-7-1 5290 Colusa trail from Summit Springs to Frog Pond (Colusa-Lake County boundary); Snow Mt. 91 Comment
  SEINET10533987  Dichelostemma capitatum Roxana S. Ferris 1917-4-14 Ferris 600 Colusa in gulch. 5 miles west of Arbuckle-Rumsey Road. 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
  HSC31688  Dichelostemma capitatum subsp. capitatum Bonnie Prange 1974-5-4 Colusa Near Clyde Mine 854 Comment
  HSC45714  Dichelostemma capitatum subsp. capitatum Sheila Logan 1978-4-2 69 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  HSC72112  Dichelostemma capitatum subsp. capitatum J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9532 Colusa Bear Valley Rd, 3 mi. from its junction with SR 20 366 Comment
  UC1334721  Dichelostemma congestum Eugene Memmler 1969-5-8 105 Colusa between Williams and Clear Lake (Hwy 20) 152 Comment
  UCD139269  Dichelostemma volubile K. Esau 1934-5-5 s.n. Colusa Tahoe-Ukiah Highway, west of Williams. Comment
  CAS-BOT-BC503142  Dichelostemma volubile Roxana S. Ferris 1926-4-23 6413 Colusa On grade beyond the Mountain House on the Williams-Stonford Road Comment
  CDA39450  Dichelostemma volubile T. C. Fuller 1958-5-27 3665 Colusa South of Highway 20, 1 mile west of junction with Highway 16. 0 Comment
  SEINET3885768  Dichelostemma volubile Richard R. Halse 1989-5-7 3826 Colusa Along the Leesville Road, 3 miles southeast of Leesville; just below the summit of the pass on the east side.; 0 480 Comment
  SEINET8476802  Dichelostemma volubile R. R. Halse 1989-5-7 3826 Colusa Along the Leesville Road, ca 3 miles SE of Leesville. 480 Comment
  CHSC94391  Digitaria sanguinalis Lowell Ahart 2006-8-22 13226 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  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
  POM313166  Digitaria sanguinalis H. L. Mason 1945-9-19 12722 b Colusa Below causway over Butte Sink spillway, east bank of Sacramento River, 1 mile north of Colusa. Comment
  RSA126969  Digitaria sanguinalis H. S. Yates 1936-8-14 6138 Colusa 3 miles S. of Grimes 15 Comment
  CAS-BOT-BC152170  Diplacus bolanderi V. Rattan 1884-6-1 s.n. Colusa Unspecified Comment
  CHSC86525  Diplacus douglasii B. Castro 2003-3-18 1389 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 243 Comment
  SEINET199008  Diplacus layneae Helen K. Sharsmith 1953-1 4290 Colusa Mendocino Nat For; In metamorphic rubble of forest clearing, 5 mi beyond Trough Springs on rd to Goat Mt. 1280 Comment
  SEINET8235421  Diplacus layneae Unknown 1959-5-27 1338 Colusa by Cooks Creek; about 1/4 mile east of Cooks Spring. Comment
  CAS-BOT-BC208651  Distichlis spicata A. A. Heller 1902-5-19 5569 Colusa Near Colusa. Comment
  CHSC114987  Distichlis spicata Lowell Ahart 2015-5-5 20116 Colusa On the north side of Maxwell-Colusa Road, about 5 1/2 miles east of Maxwell. 53 Comment
  CHSC94744  Distichlis spicata Lowell Ahart 2006-9-26 13353 Colusa Between the deep ditch and the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell. 24 Comment
  JEPS104128  Distichlis spicata Lowell Ahart 2003-8-15 10508 Colusa Rd (disked) that bordered a rice field, on the south side of Highway 20, ca 1 mi sw of Williams. 27 Comment
  JEPS108780  Distichlis spicata Lowell Ahart 2006-9-26 13353 Colusa Between the deep ditch and the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell 24 Comment
  UCD18846  Distichlis spicata Vernal Pool Team 2001; Carol Witham and Jennifer Buck 2001-4-30 154 Colusa 2 mi. south of the town of Colusa along Hwy 20, east of Hwy 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001, UTMs: 10S0587786; 4336302. Comment
  UCD61480  Distichlis spicata Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3887 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1000 ft NW of parking lot. 339 Comment
  UCD64555  Distichlis spicata A. A. Beetle 1942-5-21 3270 Colusa 12 miles north of Williams. Comment
  CDA32963  Distichlis spicata Doug Barbe & Phyllis Hiatt 1979-5-2 Colusa Williams; waste ground by Shell station. 0 Comment
  UCD64348  Distichlis spicata var. stricta K. Esau 1932-6-29 Colusa Sutter Basin, near Colusa. Comment
  UCD64488  Distichlis spicata var. stricta K. Esau; D. Hartmann 1941-7-17 Colusa West of Williams. Comment
  RSA0060085  Dodecatheon hendersonii Richard R. Halse 2014-3-25 9030 Colusa Along the Sites-Logoda Road ca. 4.7 miles northeast of Logoda; on the west end of Grapevine Pass. 527 Comment
  SEINET176835 Image available Dodecatheon hendersonii Victor Duran 1933-4-2 3378 Colusa Stonyford. 305 Comment
  UCD56911  Dodecatheon hendersonii Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3514 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. In Craig Canyon. 318 Comment
  UCR70827  Dodecatheon hendersonii Victor Duran 1933-4-2 3378 Colusa Stonyford 305 Comment
  JEPS18023  Downingia insignis George B. Rossbach 1955-4-9 512 Colusa 3 mi e Maxwell; Sacramento Valley 18 Comment
  UC1609312  Downingia insignis Vernon H. Oswald and Lowell Ahart 1993-5-27 5428 Colusa ca 0.5 mi nw Sites (Sites-Lodoga Rd, Sacramento Valley); Sacramento Valley 121 Comment
  UCD55041  Downingia insignis Herbert L. Mason 1953-4-5 14506 Colusa Three miles east of Maxwell. Comment
  RSA60889  Downingia insignis Frank W. Gould 1938-4-23 295 Colusa Roadside between Arbuckle and Williams. Comment
  UCD35944  Downingia insignis Beecher Crampton 1953-4-29 1145 Colusa 3 miles east of Maxwell. Comment
  POM59020  Downingia pulchella A. A. Heller, H. E. Brown 1902-5-1 s.n. Colusa Near College City. Comment
  HSC45678  Dudleya cymosa Stephen Plant 1978-4-22 203 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  CHSC94749  Dysphania ambrosioides Lowell Ahart 2006-9-26 13355 Colusa Along the deep ditch, south side of the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell. 24 Comment
  JEPS120799  Dysphania ambrosioides Lowell Ahart 2013-10-1 19088 Colusa Strand of East Park Reservoir, about 2.5 air miles SE of Stonyford, about 2.5 miles NW of Lodoga, about 10 air miles NW of Sites. Comment
  UCD60898  Echinochloa crus-galli K. Esau and D. Hartman 1941-7-17 Colusa Near Williams. Comment
  UCR201570  Echinochloa crus-galli George K. Helmkamp, E. A. Helmkamp 2008-10-14 14269 Colusa Sacramento Valley, along CA-20, 2 miles west of Meridian 14 Comment
  CAS-BOT-BC197272  Echinochloa muricata var. microstachya Roxana Stinchfield 1916-7-11 472 Colusa Davis tule near Sycamore Slough 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
  POM198499  Echinochloa muricata var. microstachya Roxana Stinchfield 1916-7-11 472 Colusa Davis Tule, near Sycamore Slough. Comment
  UCD61165  Echinochloa oryzicola Beecher Crampton 1963-9-9 6892 Colusa 1/4 mile E of Cortena, site of UC temporary experimental rice station 1923 - 1928. Comment
  UCD61167  Echinochloa oryzicola P. B. Kennedy 1925-9-18 Colusa Rice Station, Cortena. Comment
  UCD61166  Echinochloa oryzicola var. mutica P. B. Kennedy 1928-9-15 Colusa Rice Station, Cortena. Comment
  UCD137951  Echinodorus berteroi C. F. Dunshee 1922-1 3 Colusa Cortina. Comment
  POM312496  Eclipta alba H. L. Mason 1945-9-19 12725 Colusa Below caus[e]way over Butte Sink spillway, East bank of Sacramento River, 1 mile north of Colusa. Comment
  CAS-BOT-BC291141  Eclipta prostrata Herbert L. Mason 1945-9-19 12725 Colusa Below causway over Butte Sink spillway, east bank of Sacramento River, 1 mile north of Colusa Comment
  UCD49598  Eleocharis engelmannii John M. Tucker 1953-8-28 2676 Colusa In rice field; 7 miles east of Arbuckle, Colusa County, California. 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
  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
  POM198509  Eleocharis palustris Roxana Stinchfield 1916-7-11 453 Colusa Colusa - Williams Road at Trough Comment
  CHSC84216  Eleocharis parishii Lowell Ahart 2003-7-14 10382 Colusa Along a stream, field on the south side of Highway 20, about 2 miles southwest of the intersection of Highway 20 and Bear Valley Road, about 21 miles (by road) southwest of Williams. 520 Comment
  JEPS80393  Elymus L. R. Heckard and J. Hickman 1981-6-22 5626 Colusa below (s of) Dark Hollow Trail; Snow Mt. 1981 Comment
  UCD61431  Elymus elymoides Beecher Crampton 1958-5-19 4815 Colusa Little Stony Creek Canyon 4-8 miles west of Lodoga. Comment
  JEPS80181  Elymus elymoides subsp. elymoides L. R. Heckard with J. Hickman 1980-7-3 5333 Colusa just w Summit Springs (ca 10 mi w of Stonyford, sw Snow Mt., Colusa-Lake Co. boundary); Snow Mt. 1548 Comment
  CHSC91005  Elymus glaucus D. Isle 2002-6-28 177 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. Below 4x4 Rd. 17N31 (Lovelady Ridge Jeep Rd.). 1060 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
  UC1146624  Elymus trachycaulus Freed W. Hoffman 1944-7-13 1964 Colusa between Indian Valley and Bear Valley (w Colusa Co,); North Coast Ranges 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
  JEPS16205  Emmenanthe penduliflora Rimo Bacigalupi and Arthur Holmgren 1950-4-26 3180 Colusa Just west of base of the grade to Indian Valley (Bartlett Mt. Road), just west of Bear Valley, Inner North Coast Ranges Comment
  UCD170129  Emmenanthe penduliflora Jack Alderson 2016-5-1 s.n. Colusa BLM Bear Creek Ranch (formerly Payne Ranch); 2400 feet (730 m) west of the confluence of Brophy Creek with Bear Creek. 341 Comment
  CDA40328  Emmenanthe penduliflora D. Brown 1974-8-8 s.n. Colusa Mendocino National Forest, Stonyford. 0 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
  UC1614404  Epilobium Charles M. Belshaw 1937-4-25 2828 Colusa Inner North Coast Range, Cooks Spring, Devils Ridge Devils Ridge; Inner North Coast Range, Cooks Spring, Devils Ridge Comment
  UC71878  Epilobium brachycarpum H. P. Chandler 1905-9-14 Colusa Princeton Comment
  UCD105385  Epilobium brachycarpum P. B. Kennedy 30-31 May 1922 s.n. Colusa Near Colusa. Comment
  UCD82133  Epilobium brachycarpum Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5663 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 861 Comment
  JEPS94756  Epilobium densiflorum Vernon H. Oswald and Lowell Ahart 1998-7-15 9303 Colusa 6.3 mi n of Highway 20 (w side of Walker Ridge Road 8.2 mi s of Bartlett Springs Road); Walker Ridge Road 792 Comment
  CHSC80234  Epilobium foliosum B. Castro; L. P. Janeway 2000-5-2 1118 Colusa Vicinity of Sites-Lodoga Rd, and Grapevine Creek. On W-facing slope by dirt road just E of creek. 249 Comment
  CHSC27709  Epilobium minutum Tim Spira; Robert A. Schlising 1978-5-13 3232 Colusa Just E of Lake County line, along Hwy 20. Comment
  HSC72213  Epilobium minutum Thomas W. Nelson, Jane P. Nelson 1980-6-24 5877 Colusa Along road to Snow Mtn. trail head at Summit Springs 1585 Comment
  JEPS73520  Epilobium minutum L. R. Heckard 1972-7-10 3138 Colusa between Foutch Camp and Trout Creek crossing; Snow Mt. 1828 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
  CDA38111  Epilobium minutum Vernon H. Oswald & Lowell Ahart 1998-5-7 9005 Colusa Bartlett Springs Road, 2.1 miles west of Bear Valley Road, 0.8 mile east of Sawtelle Valley and Grapevine Flat Roads. Comment
  JEPS79752  Epilobium minutum L. R. Heckard and J. C. Hickman 1980-7-2 5302 Colusa trail from Summit Springs to Snow Mt. Peaks (ca 10 mi w of Stonyford, Colusa-Lake Co. boundary); Snow Mtn. 1661 Comment
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Feb 26 2013
  CHSC101430  Epilobium nivium David Isle 1990-6-6 1527 Colusa On Lower Summit Valley Rock Outcrop W of Rd 17N10. 1682 Comment
  CHSC32221  Epilobium nivium James Jokerst 1980-8-6 1049 Colusa North Coast Ranges. Near Snow Mountain. 484 Comment
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Dec 23 2008
  JEPS118602  Epipactis gigantea B. Castro, L. P. Janeway 2001-6-3 1257 Colusa Inner North Coast Ranges. Spring at Grapevine flat, on top of Walker Ridge about 0.5 mi E of Baldy Mountain. Leesville 7.5' quad. Comment
  JEPS110233  Equisetum laevigatum Lowell Ahart 2006-8-22 13210 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  RSA129661  Eragrostis hypnoides H. S. Yates 1936-8-14 6139 Colusa 3 miles S. of Grimes 15 Comment
  CHSC94401  Eragrostis pectinacea var. pectinacea Lowell Ahart 2006-8-9 13164 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  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
  CAS-BOT-BC479710  Eriastrum abramsii Ann Howald 2003-5-29 2345 Colusa Inner North Coast Ranges: Indian Valley, east side of East Park Reservoir, c. 3.1 mi N of Lodoga, near shore of reservoir 370 Comment
  UCR261668  Eriastrum abramsii Ann Howald 2003-5-29 2345 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3.1 miles north of Lodoga, near shore of reservoir 370 Comment
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Dec 15 2016
  CHSC35579  Ericameria linearifolia J. P. Smith; Tom Nelson, Jane Nelson 1978-4-1 9527 Colusa Walker Ridge road, 3.2 miles from its junction with State Route 20. Comment
  HSC72122  Ericameria linearifolia J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-1 9527 Colusa Walker Ridge Road, 3.2 mi. from its junction with State Route 20. Comment
  JEPS95505  Ericameria linearifolia Vernon H. Oswald and L. Ahart 1994-3-23 6019 Colusa just W of the bridge over Sullivan Creek, S of Stonyford; Goat Mtn. Rd; T16N R7W NE1/4 NW1/4 Sec. 1, 1660 ft, Chaparral. Goat Mtn. Rd. just W of the bridge over Sullivan Creek, S of Stonyford 505 Comment
  UCD131145  Ericameria linearifolia G. F. Hrusa; K. Van Katwyk 1995-4-22 12107 Colusa Inner North Coast Ranges. 950 Comment
  RSA14917  Ericameria linearifolia L. S. Rose 1934-3-13 34054 Colusa 2 miles E Clayton. Comment
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Jul 30 2014
  CHSC92605  Erigeron inornatus var. inornatus D. Isle 2005-8-2 1159 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. West end of Board Camp Ridge. 1554 Comment
  HSC65994  Eriodictyon californicum Cathie Goldberg, Lynn Kunstman, Lauren Philbrick, Geoff Walsh 1980-1 49 Colusa Leesville Rd. from Leesville to Williams, 3.8 mi. E of Leesville Comment
  RSA23083  Eriodictyon californicum Lincoln Constance 1939-5-14 2488 Colusa Above Middle Fork of Stony creek 2.5 miles E of Bonnie View, Inner N Coast Ranges 518 Comment
  UC2042511  Eriodictyon californicum Holly Forbes and Barbara Keller 2011-7-7 Colusa Walker Ridge Rd, 4.4 miles N from its intersection with Highway 20. 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
  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
  CHSC92835  Eriogonum dasyanthemum D. Isle 2000-6-7 1245 Colusa Mendocino National Forest -- North Coast Ranges Little Stony Creek Watershed. Junction of Frenzel Creek with Little Stony Creek Road. 426 Comment
  RSA0118881  Eriogonum dasyanthemum Lowell Ahart 2013-10-1 19066 Colusa Inner North Coast Range. North of the wash and State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  SBBG83903  Eriogonum dasyanthemum L. F. LaPre 1986-5-30 Colusa 1.5 mi W of Mendocino Nat Forest boundary on Stony Crk Rd; T18N, R7W, S34 670 Comment
  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
  UC1552830  Eriogonum dasyanthemum Frederica Bowcutt 1985-5-5 509 Colusa ca. 1 mi nw Wilbur Springs Comment
  UCD41208  Eriogonum dasyanthemum John Snelling 1986-5-17 3 - Colusa 8.2 mi. west of Sites on Sites-Lodoga Road. Comment
  UCR212378  Eriogonum dasyanthemum Ellen Dean, Craig D. Thomsen, N. Voegtly, J. Alderson, Gordon Harrington 2008-3-30 4677 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Slopes to the NW of Eula Canyon and west of Cowboy Camp on the west side of Bear Creek 513 Comment
  UCR261730  Eriogonum dasyanthemum Ann Howald 2003-5-29 2353 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3.7 miles north of Lodoga, near Chisolm Cove Group Campground 378 Comment
  CAS-BOT-BC242578  Eriogonum dasyanthemum A. J. Bassinger 1920-10-29 s.n. Colusa Sand Creek Comment
  CAS-BOT-BC242581  Eriogonum dasyanthemum James L. Reveal 1975-7-27 3902 Colusa Along the Leesville Road west of Williams, on a steep road grade about 3.2 miles southeast of Leesville, and about 1 mile below the summit of the grade Comment
  CDA22487  Eriogonum dasyanthemum D. Brown 1973-10-19 Colusa Sand Creek, ca. 6 miles west of Arbuckle. 0 Comment
  OBI47577  Eriogonum dasyanthemum L. F. LaPre 1986-5-30 s.n. Colusa 1.5 mi W of Mendocino NF boundary on Stony Crk rd 671 Comment
  RSA0115043  Eriogonum dasyanthemum Lyman Benson 1948-7-16 12922 Colusa Road between Williams and Clear Lake just east of Lake Co. line. Mt. Range: Inner North Coast. 548 Comment
  UCD100311  Eriogonum luteolum Arthur M. Shapiro 1988-8-24 s.n. Colusa near Glenn County line, at Goat Mountain Lookout, just below summit of Goat Mountain. 1865 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
  UCR88379  Eriogonum nudum var. nudum 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
  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
  RSA133246  Eriogonum spergulinum var. reddingianum Peter H. Raven, Richard Snow 1959-9-11 14419 Colusa Openings in forest of Pinus ponderosa, Dark Hollow Creek. 1860 Comment
  CHSC32206  Eriogonum strictum var. greenei James Jokerst 1980-8-8 1077 Colusa North Coast Ranges. Near Snow Mountain (west). Comment
  CHSC33915  Eriogonum strictum var. greenei James Jokerst 1980-8-6 1048 Colusa North Coast Ranges. Near Snow Mountain. 484 Comment
  SBBG83902  Eriogonum tripodum L. F. LaPre 1986-5-30 Colusa 1.5 mi W of Mendocino Nat Forest boundary on Stony Crk Rd; T18N, R7W, S34 670 Comment
  UCD163314  Eriogonum wrightii Craig D. Thomsen 1997-4-13 1903 Colusa Bear Valley. About 6 miles north of Hwy 20. Vicinity of Trout Creek, north of Deadshot Canyon. Comment
  CHSC106367  Eriogonum wrightii var. trachygonum David Isle 1992-9-24 1807 Colusa Mendocino National Forest - North Coast Ranges, Little Stony Creek watershed. Little Stony Road ~0.1 miles W of jct. w/ Co. Rd 306 (~5.8 miles S of Stonyford Store). 402 Comment
  HSC39241  Eriophyllum lanatum J. P. Smith, Thomas W. Nelson 1976-4-14 8578 Colusa Mendocino National Forest, confluence of Stony Creek and N Fork of Stony Creek. 427 Comment
  CAS-BOT-BC308097  Eriophyllum lanatum var. achilleoides A. A. Heller 1916-6-6 12353 Colusa Coast Range on the grade about 3 miles west of Leesville Comment
  CAS-BOT-BC308099  Eriophyllum lanatum var. achilleoides Roxana S. Ferris 1926-4-23 6453 Colusa Stonyford Comment
  CHSC94882  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
  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
  SDSU4094  Eriophyllum lanatum var. achilleoides D. F. Howe 1962-5-19 3283 Colusa 20 miles west of Williams on #20. 396 Comment
  CAS-BOT-BC308100  Eriophyllum lanatum var. achilleoides Roxana S. Ferris 1926-4-23 6445 Colusa Near top of Grapevine Grade between Stonyford and Sites Comment
  UCD57557  Erodium cicutarium Cindy Yip; with Plant Biology 102 2007-4-29 5 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Meadow on the west side of State Route 16, ca. 2 road miles south of intersection with State Route 20. 304 Comment
  UCR212363  Erodium cicutarium Craig D. Thomsen 2000-3-31 2083 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mi west of Hwy 20/16 intersection, milepost 3.00 310 Comment
  POM163436  Erodium macrophyllum Roxana S. Ferris 1926-4-23 6406 Colusa Grade beyond the Mountain House on the Williams-Stonyford Road. Comment
  UC1487274  Eryngium aristulatum var. aristulatum Yusuf Sheikh and Lincoln Constance 1973-5-12 542 Colusa s. Leesville (on Bear Valley Rd. toward Clear Lake, 1 mi. s. of Brim Rd., 13.3 mi. n. of State Hwy. 20) Comment
  UCD38844  Eryngium castrense Beecher Crampton 1958-6-26 4976 Colusa along Grieve road, just northeast Hershey R.R. siding, 5.5 miles south of College City. Comment
  CDA38319  Eryngium castrense Kingwell 1930-5-2 s.n. Colusa [no additional data] 0 Comment
  CDA21063  Erysimum capitatum G. F. Hrusa 1993-5-2 10856 Colusa North Coast Ranges; Frenzel Creek Research Natural Area, Mendocino National Forest. Mouth of Frenzel Creek, tributary of Little Stony Creek. Comment
  UCD64435  Erysimum capitatum Craig D. Thomsen 2001-4-24 2474 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCR198118  Erysimum capitatum K. A. Bear 1978-4-9 24 Colusa 5 mi north of Hwy 20 on Bear Valley Road 401 Comment
  CAS-BOT-BC40755  Erysimum capitatum G. B. Rossbach; R. P. Rossbach 1938-5-31 851 Colusa About 18 miles west of Williams. Comment
  CDA34089  Erysimum capitatum P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  HSC6769  Erysimum capitatum var. capitatum M. Dole 1963-4-15 67 Colusa 6 mi. S of the junction of Hwys. 16 and 20 on Hwy. 16 Comment
  POM143091  Erysimum capitatum var. capitatum Roxana S. Ferris 1917-4-14 576 Colusa 7 miles W of Arbuckle, Arbuckle - Rumsey Road Comment
  RSA590193  Erysimum capitatum var. capitatum Michael A. Vincent, Robert M. Rhode 1996-3-30 7287 Colusa Along Bear Valley Rd. above Bear Creek, 0.6 mi. N jct. Wilbur Springs Rd. Comment
  CHSC80446  Erythranthe latidens Caroline Warren; Jenny Marr 1998-5-4 Colusa Vicinity of Sites and Stone Corral Creek. 91 Comment
  CHSC84196  Erythranthe microphylla Lowell Ahart 2003-7-14 10383 Colusa Along a stream, field on the south side of Highway 20, about 2 miles southwest of the intersection of Highway 20 and Bear Valley Road, about 21 miles (by road) southwest of Williams. 520 Comment
  CAS-BOT-BC376186  Erythranthe moschata Andrew Townesmith; Karen M. Meyer 2007-8-7 912 Colusa Mendocino National Forest, Grindstone Ranger District. Big Spring Picnic area on Lett's Lake, off Forest Service road 17N02, 3.2 miles SW from intersection with Forest Service route M10 1371 Comment
  CHSC100950  Eschscholzia caespitosa Rodney Lacey 2008-4-1 Colusa Inner North Coast Ranges. Little Stony Creek; on private dirt road adjacent to Goat Mountain Road, near Lodoga-Stonyford Road, approximately 3.2 km west of Lodoga. 398 Comment
  HSC62925  Eschscholzia caespitosa Marla J. Carollo 1979-4-14 36 Colusa Bear Valley Rd., 3.9 mi. N of Hwy. 20 412 Comment
  RSA794942  Eschscholzia caespitosa George K. Helmkamp, E. A. Helmkamp 2011-4-1 17124 Colusa Antelope Valley, along Maxwell-Sites Road, 0.4 miles southeast of Sites 93 Comment
  UCD63022  Eschscholzia caespitosa Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4674 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Slopes to the northwest of Eula Canyon and west of Cowboy Camp on the west side of Bear Creek. 451 Comment
  UCD82626  Eschscholzia caespitosa Craig Thomsen; G. Harrington 2009-5-12 2896 Colusa Colusa County on Walker Ridge: from spur road about 1/2 mile east of Walker Ridge Road, en route to Eaton Springs. 813 Comment
  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
  UCD57627  Eschscholzia californica Michele Lanctot; 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. Bottom of serpentine slope in the middle of the path. 356 Comment
  CAS-BOT-BC402976  Eschscholzia californica A. A. Heller 1919-5-10 13115 Colusa Valley west of Leesville Comment
  CAS-BOT-BC5884  Eschscholzia californica Townsend Stith Brandegee 1889-4-1 s.n. Colusa unspecified 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
  CHSC64613  Euphorbia spathulata Vernon H. Oswald; Margie McNairn 1995-4-23 6680 Colusa Inner North Coast Ranges. Along a roadside ditch bordering Bear Valley Rd. s of Brim Rd. (Bartlett Springs Rd.), w of Williams. 417 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
  JEPS120975  Euphorbia spathulata Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18645 Colusa On N side of Hwy 20, just E of Lake County Line, 12.2 air miles ENE of town of Clear Lake, 17.1 air miles W of Williams. Comment
  UCD65626  Euphorbia spathulata Craig D. Thomsen 2000-4-12 2128 -a 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
  UCD82503  Euphorbia spathulata Craig Thomsen; G. Harrington 2009-5-12 2863 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  UCD57295  Extriplex joaquinana Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3666 Colusa BLM Payne Ranch. Near origin of Craig Canyon. West of Hwy. 16, ca. 2 road miles south of junction of Hwy. 20 and Hwy. 16. 359 Comment
  UCD58122  Extriplex joaquinana Ellen Dean; PLB 102 Class 2007-4-29 3718 Colusa Payne Ranch. West of Hwy. 16. Ca. 2 road miles S of junction of Hwy. 20 and Hwy. 16. Near origin of Craig Canyon. 359 Comment
  UCD66909  Extriplex joaquinana 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. Southwest of Cowboy Camp on the west side of Bear Creek. Ridge to the north of spring box. 365 Comment
  JEPS75748  Festuca californica L. R. Heckard and R. Bacigalupi 1976-9-6 4423 Colusa above Summit Springs (along trail to Fouts Camp, Colusa-Lake County line); Snow Mt. 1645 Comment
  JEPS120970  Festuca microstachys var. pauciflora Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18636 Colusa On N side of Hwy 20, just E of Lake County Line, 12.2 air miles ENE of town of Clear Lake, 17.1 air miles W of Williams. Comment
  JEPS81295  Festuca roemeri L. R. Heckard and J. C. Hickman 1982-7-5 5909 Colusa below Summit Springs; Snow Mt. 1524 Comment
  CAS-BOT-BC77677  Ficus carica J. H. Thomas 1960-8-30 8867 Colusa Edge of College City Comment
  UCD146604  Frangula californica subsp. crassifolia G. F. Hrusa 1998-6-19 14599 Colusa North Coast Ranges. Along Little Stony Creek. Goat Mountain Road, around 1 km west of intersection with Lodoga-Stonyford Road. 415 Comment
  CAS-BOT-BC62920  Frangula californica subsp. tomentella C. Hart Merriam 1907-7-23 s.n. Colusa Cook Spgs. Comment
  HSC48172  Frangula californica subsp. tomentella Thomas W. Nelson, Jane P. Nelson 1978-4-29 3936 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  UCD58175  Frangula californica subsp. tomentella Gordon Harrington 2007-5-31 67 Colusa BLM Payne Ranch. Lands to the SW of the intersection of Hwy 16 and Hwy 20. Along Thompson Creek, approximately 3/4 mile downstream from Road Kill Cafe. 357 Comment
  CAS-BOT-BC223844  Frankenia palmeri Roxana Stinchfield 1916-6-17 282 Colusa College City Comment
  CHSC80203  Frankenia salina B. Castro; G. Kuenster 2000-7-19 1207 Colusa Vicinity of Maxwell, Funks Creek, and the Glenn-Colusa canal, on low terrace beside S edge of shallow intermittent steam channel draining eastwasrd out of the hills east of Golden Gate. 54 Comment
  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
  CHSC36175  Fraxinus dipetala Robert A. Schlising 1978-4-10 3218 Colusa Grapevine Pass, on Sites--Lodoga Road. 562 Comment
  UCD163233  Fraxinus dipetala Craig D. Thomsen 2000-4-12 2156 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 1 mile west of Hwy 20/16 intersection. 345 Comment
  SEINET5735298 Image available Fraxinus dipetala Dorothy E. Schmidt 1960-1 20 Colusa North side of road, Hwy 20, north side of Capay.; Capay Comment
  CAS-BOT-BC223489  Fraxinus latifolia Roxana Stinchfield 1916-7-8 391 Colusa Sycamore Slough Comment
  CHSC75732  Fraxinus latifolia Vernon H. Oswald; Lowell Ahart 1999-6-22 9779 Colusa Lily Pond near Upper Letts Lake west of Stonyford. 1243 Comment
  UC1178025  Fraxinus latifolia Herbert L. Mason 1947-3-29 13156 Colusa ca 3 mi ne Colusa (along Butte Creek); Butte Creek Comment
  RSA589939  Fritillaria Michael A. Vincent, Robert Rhode 1996-3-30 7305 Colusa Along Brim Road, 2.9 mi W jct Bear Valley Rd. Comment
  CAS-BOT-BC130432  Fritillaria pluriflora Gladys L. Smith 1978-3-18 4800 Colusa Bear Valley, on Wilbur Springs Road Comment
  CAS-BOT-BC130433  Fritillaria pluriflora James Jokerst 1985-4-10 2229 Colusa Near Walker Ridge Comment
  CAS-BOT-BC130435  Fritillaria pluriflora Robert F. Hoover 1939-3-5 3901 Colusa Two miles south of Stonyford 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
  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
  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
  UCSB24339  Fritillaria pluriflora Roderick, Wayne 1966-3-26 Colusa Bear Valley, beside Bartlett Springs Road, 1/2 mile east of Robbers Flat Comment
  HSC62768  Fritillaria purdyi M. Dean Griswold Jr. 1979-4-14 16 Colusa 1067 Comment
  HSC62800  Fritillaria purdyi Michelle Stevens 1979-4-14 32 Colusa 1067 Comment
  CDA14917  Galium andrewsii G. F. Hrusa 1993-5-2 10862 Colusa North Coast Ranges; Frenzel Creek Research Natural Area. Mendocino National Forest. Above Frenzel Creek, tributary of Little Stony Creek. Comment
  UCD66703  Galium andrewsii Craig D. Thomsen 2001-4-12 2451 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  JEPS120712  Galium andrewsii subsp. andrewsii Lowell Ahart 2013-10-1 19067 Colusa Near a small drainage, north of the wash and State Highway 20, just east of Lake County line, 12.2 air miles ENE of the town of Clear Lake, 17.1 air miles west of Williams. Comment
  JEPS52790  Galium andrewsii subsp. andrewsii Lauramay T. Dempster and G. L. Stebbins 1965-5-21 4096 Colusa Hwy 20 along creek 1 mi w junction with Hwy 16; Bear Creek 335 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
  UCSC010370  Galium andrewsii subsp. andrewsii Dylan M. Neubauer, Tim Forsell 2016-3-30 594 Colusa (NCoRI) Walker Ridge, Bartlett Springs Road, 1.22 air-miles sse Baldy Mountain 899 Comment
  JEPS80392  Galium aparine L. R. Heckard and J. Hickman 1981-6-22 5625 Colusa Dark Hollow Trail Snow Mt. 1965 Comment
  UCD64437  Galium aparine Craig D. Thomsen 2000-3-31 2070 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  CDA15479  Galium californicum subsp. flaccidum G. F. Hrusa, WTD 1998-6-19 14616 Colusa North Coast Ranges; Goat Mtn. Rd. approx. 1 km. below intersection with USFS Pacific Ridge Rd. (M5). Comment
  JEPS27422  Galium grayanum var. nanum Peter H. Raven and Richard Snow 1959-9-11 14411 Colusa s shoulder Snow Mountain (w-facing scree slope) 2042 Comment
  RSA133259  Galium grayanum var. nanum Peter H. Raven, Richard Snow 1959-9-11 14411 Colusa S shoulder of Snow Mtn. 2043 Comment
  JEPS80877  Galium parisiense L. R. Heckard and J. C. Hickman 1980-7-3 5364 A Colusa slopes about Summit Springs (sw slope of mt); Snow Mt. 1554 Comment
  UCR212309  Galium parisiense Craig D. Thomsen 2000-3-31 2080 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mi west of Hwy 20/16 intersection, milepost 3.00 310 Comment
  UCD56666  Galium porrigens Jack Alderson 2007-3-25 2 Colusa BLM Payne Ranch. Destinella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 555 Comment
  UCD81242  Galium porrigens var. tenue Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5406 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Inside canyon that is located to the south of Brophy Canyon. 292 Comment
  CDA42204  Galium trifidum var. pacificum G. D. Barbe, Daryl Brown 1982-7-2 3891 Colusa Mill Valley Campground, Lower Letts Lake, Mendocino National Forest. Comment
  UCR261662  Galium triflorum Ann Howald 2003-5-5 2331 Colusa Inner North Coast Ranges, Little Stony Creek at crossing of Lodoga-Stonyford Road 379 Comment
  CAS-BOT-BC199032  Garrya congdonii Milo S. Baker 1947-4-6 11645 Colusa Along Hwy. 20 just E of the Lake-Colusa boundary. 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
  UCD163842  Garrya congdonii Craig D. Thomsen 2000-6-1 s.n. Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  CHSC107496  Garrya veatchii Ralph Minto 2010-1-29 1919 Colusa Mendocino National Forest - North Coast Ranges Middle Fork Stony Creek Watershed. Fouts Springs road. 609 Comment
  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
  CHSC85961  Gastridium phleoides Jenny Marr; Heidi West, Joyce Lacey-Rickert, Caroline Warren 1998-5-8 Colusa Vicinity of Sites and Antelope Valley. 106 Comment
  CHSC77934  Geranium carolinianum Beth Hendrickson; Jean Witzman 1999-4-22 Colusa Vicinity of Antelope Valley and Sites. 152 Comment
  UCD111675  Gilia capitata Christopher Mallek 2008-1 s.n. Colusa Frenzel Creek. 654 Comment
  UCD66681  Gilia capitata Craig D. Thomsen 2000-5-11 2308 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
  RSA537483  Gilia capitata Barbara Ertter 1989-7-1 8601 Colusa Road to Goat Mt Lookout 2.2 mi S of Rt M-10 (Bear Creek, ca 12 airmiles WSW of Stonyford 1500 Comment
  CHSC87237  Gilia clivorum B. Castro; Beth Hendrickson 2003-3-24 1399 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 310 Comment
  UC73637  Gilia clivorum Miss M. Alice King 1905-1 Colusa near College City (Sacramento Valley); , near College City Comment
  HSC66136  Gilia tricolor S. Harris, B. Ferguson, M. Moble, M. Smith 1980-4-19 Colusa Bartlett Springs Rd. Comment
  POM282251  Gilia tricolor Lyman Benson 1929-3-26 1043 Colusa Wilbur Springs 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
  UCD64267  Gilia tricolor Craig D. Thomsen 2000-3-31 2065 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  HSC71310  Gilia tricolor Thomas W. Nelson, Jane P. Nelson 1979-4-11 4615 Colusa Along Leesville to SR 20 cutoff 5 mi. E of Leesville Comment
  RSA0118785  Gilia tricolor subsp. diffusa Lowell A. Ahart 2013-5-1 18684 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
  JEPS86015  Gilia tricolor subsp. tricolor Alice King May 1906 Colusa College City 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
  CHSC79484  Githopsis specularioides B. Castro; L. P. Janeway 2000-5-4 1141 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 248 Comment
  HSC45716  Githopsis specularioides Sheila Logan 1978-4-22 61 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  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
  JEPS75039  Glyceria elata L. R. Heckard 1972-7-10 3110 Colusa Trout Creek Snow Mt. (at crossing of trail to Box Spring, Snow Mt.) 1828 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
  UCD162346  Grindelia camporum Chuck Hughes 2015-1-13 414 Colusa North side of Highway 20, just east of the I-5 interchange. 20 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
  JEPS108720  Grindelia hirsutula Lowell Ahart 2006-9-26 13345 Colusa Between the deep ditch and the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell 24 Comment
  JEPS113893  Grindelia hirsutula L. P. Janeway 2007-6-17 9059 Colusa Inner North Coast Ranges; Along Bear Valley Road and Bear Creek near Hwy 20. 325 Comment
  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
  UC727696  Grindelia hirsutula Milo S. Baker 1946-9-3 11582 Colusa towards Williams on Hwy 3 mi w Colusa 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
  CHSC80500  Hainardia cylindrica Caroline Warren; Jenny Marr, Heidi West, Natalie Wight 1998-6-11 Colusa Vicinity of Funks Creek and Logan Ridge. 106 Comment
  JEPS120990  Hainardia cylindrica Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18638 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
  UCD36223  Hainardia cylindrica Beecher Crampton 1953-4-29 1143 A Colusa Colusa County, 2 miles east of Maxwell. Comment
  UCD85141  Hainardia cylindrica Beecher Crampton 1953-4-29 1143 A Colusa Colusa County, 2 miles east of Maxwell. Comment
  UCD85150  Hainardia cylindrica Beecher Crampton 1958-6-27 4988 Colusa 3.5 miles south of Colusa. Comment
  CHSC32204  Hazardia whitneyi var. discoidea James Jokerst 1980-8-7 1068 Colusa North Coast Ranges. Near Snow Mountain (west). 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
  CHSC106249  Helenium bigelovii B. Castro; L. P. Janeway 2001-6-3 1258 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. 882 Comment
  CDA15546  Helianthus bolanderi G. F. Hrusa 1998-10-28 14897 Colusa North Coast Ranges; along Cedar Camp Rd. as it enters Little Stony Ck. Cyn., approx. 1/2 mi. from Lodoga/Stonyford Rd. 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
  UC71768  Helianthus bolanderi H. P. Chandler 1905-9-14 Colusa Princeton Comment
  UCD144347  Helianthus bolanderi G. F. Hrusa 1998-10-28 14897 Colusa Inner North Coast Ranges. Along Cedar Camp Road as it enters Little Stony Creek Canyon. Approximately 1/2 mile from Lodoga/Stonyford Road. 400 Comment
  JEPS120804  Heliotropium curassavicum Lowell Ahart 2013-10-1 19096 Colusa Strand of East Park Reservoir, about 2.5 air miles SE of Stonyford, about 2.5 miles NW of Lodoga, about 10 air miles NW of Sites. Comment
  UC1552825  Heliotropium curassavicum Frederica Bowcutt 1985-5-20 527 Colusa 10 air miles w. Williams (n.e. of Wilbur Springs ca. 7 mi., along Hwy. 20 and Salt Creek) Comment
  JEPS104401  Helminthotheca echioides Lowell Ahart 2003-10-23 10661 Colusa Along Squaw Creek, just south of East Park Reservoir, ca 1/8 mi nw of Sites Lodoga Rd, ca 1 mi n of Lodoga, ca 21 mi w of Maxwell. 368 Comment
  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
  CDA15460  Hemizonia congesta subsp. clevelandii G. F. Hrusa, WTD 1998-6-19 14596 Colusa North Coast Ranges; Along Little Stony Creek, on Goat Mtn. Rd. ~ 1/2 km. W of intersection with Lodoga-Stonyford Rd. Comment
  UCD146726  Hemizonia congesta subsp. clevelandii G. F. Hrusa 1998-6-19 14596 Colusa Inner North Coast Ranges. Along Little Stony Creek, on Goat Mountain Road. Around 1/2 km west of intersection with Lodoga-Stonford Road. 400 Comment
  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
  UCD72483  Hemizonia congesta subsp. luzulifolia Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3817 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. West side of Bear Creek, along trail that beings approximately across from BLM parking lot, located at south end of bridge. 256 Comment
  UCD82492  Hemizonia congesta subsp. luzulifolia Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5680 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
  UC194238  Hemizonia congesta subsp. luzulifolia H. M. Hall 1916-8-16 10268 Colusa near Williams (s to Vacaville) Comment
  JEPS127571  Hemizonia congesta subsp. tracyi David Isle with Frank Pendell 2014-6-16 2136 Colusa North Coast Range: ~2 miles W of Stonyford on Pendell Ranch. SE of Pendell home ~1/4 mile; NW of Cemetery ~200 yards. Gilmore 7.5' Quad. 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
  UC88280  Hesperevax acaulis var. acaulis B. 1885-5-1 Colusa Williams Comment
  CHSC89860  Hesperevax acaulis var. robustior B. Castro; L. P. Janeway 2001-4-19 1234 Colusa Vicinity of Grapevine Creek, Sites-Lodoga Road, and Scotties Spring. In revegetating dirt road bed at edge of chaparral and riparian vegetation. At upper edge of corridor along perennial N-S-trending creek. 278 Comment
  UCR261648  Hesperevax caulescens Ann Howald 2003-4-23 2314 Colusa Inner North Coast Ranges, Indian Valley, East Park Reservoir, Catholic Point peninsula, east of Coppermine Road, c. 1.1 mi north of intersection with East Ruby King Road 403 Comment
  UCD57051  Hesperevax sparsiflora var. sparsiflora Gordon Harrington; Diana Hickson 2007-4-7 0012 Colusa BLM Payne Ranch, SW of intersection of Hwy 16 and Hwy 20, 3/4 mile west of Roadkill Cafe. 499 Comment
  JEPS94735  Hesperolinon californicum Vernon H. Oswald and Lowell Ahart 1998-7-15 9269 Colusa Bartlett Springs Road 1.6 mi w of Bear Valley Road; Bartlett Springs Road 487 Comment
  UC1212442  Hesperolinon californicum Herbert L. Mason 1946-5-31 12815 Colusa 1 mi e Lake County line (Bartlett Springs to Williams road, western Colusa County); Inner North Coast Ranges Comment
  UCD61439  Hesperolinon californicum Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3884 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1/4 mile NW of parking lot in hills to the west of Bear Creek. 356 Comment
  UCD63873  Hesperolinon californicum Craig D. Thomsen 2008-5-31 2759 Colusa BLM Payne Ranch. Lands to the southwest of the intersection of Hwys 16 and 20. Cowboy Camp area on the west side of Hwy 16, 1 mile south of Hwy 20. 0.25 mile west of public viewing area and Bear Creek. 305 Comment
  UCD63908  Hesperolinon californicum Craig D. Thomsen 2000-6-23 2382 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection (between Colusa Co. mileposts 2.17 and 2.25). 342 Comment
  UCD63917  Hesperolinon californicum Craig D. Thomsen 2001-5-24 2506 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection (between Colusa Co. mileposts 2.17 and 2.25). 342 Comment
  UC1552829  Hesperolinon californicum Frederica Bowcutt 1985-5-5 511 Colusa nw Wilbur Springs; Big Valley Shale Barrens Comment
  UC1212480  Hesperolinon disjunctum Helen K. Sharsmith 1953-6-17 4250 Colusa above Wide Awake Mercury Mine (abandoned) (above Wilbur Springs (3 mi w of State Hwy 20)); Inner North Coast Ranges 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
  UCD63114  Hesperolinon disjunctum Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4945 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20. 398 Comment
  OBI47609  Hesperolinon disjunctum L. F. LaPre 1986-5-30 s.n. Colusa 1.5 mi W of Mendocino Nat. Forest boundary on Stony Crk rd (Stonford 15' Quad 671 Comment
  SBBG128806  Hesperolinon disjunctum L. Ahart, J. Dittes, J. Guardino 2013-4-26 18635 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
  CHSC111651  Hesperolinon drymarioides David Isle; Niall McCarten, Roxanne Bittman 1987-5-26 2062 Colusa Mendocino National Forest - North Coast Ranges Little Stony Creek Watershed. On N slope openings in serpentine chaparral N of Cook Springs (at end of rd). 463 Comment
  RSA151706  Hesperolinon drymarioides H. K. Sharsmith 1952-6-21 4159 Colusa North canyon slope overlooking Cook Springs 549 Comment
  UC1212301  Hesperolinon drymarioides Helen K. Sharsmith 1953-7-1 4407 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
  RSA0069334  Heteranthera dubia Dean W. Taylor 2014-5-18 21476 Colusa 3.5 miles southwest of Maxwell; eastern bank of the Glenn-Colusa Canal downstream of the crossing of Fairview Road. 36 Comment
  CDA16130  Heteromeles arbutifolia G. F. Hrusa 1999-2-13 14913 Colusa North Coast Ranges; Along Little Stony Creek, on road to Cedar Camp and Goat Mtn. 0 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
  UCR206401  Heteromeles arbutifolia George K. Helmkamp, E. A. Helmkamp 2009-3-11 14376 Colusa Inner North Coast Range Foothills, along CA-20, 14.3 miles southwest of Williams 375 Comment
  SEINET6710046  Heteromeles arbutifolia var. macrocarpa R. R. Halse 2012-3-29 8458 Colusa Along State HWY 20, just east of the Lake County Line about 14.6 miles east of the junction with State HWY 558 Comment
  UC1192277  Hibiscus lasiocarpos Herbert L. Mason 1945-7-11 12649 Colusa 3 mi above Colusa (plains near Butte Creek, Butte Lodge Outing Club) Comment
  UC914092  Hibiscus lasiocarpos Milo S. Baker 1946-9-4 11608 Colusa near locked gate of Colusa Gun Club Butte Sink Comment
  RSA93450  Hibiscus lasiocarpos Milo S. Baker 1946-9-4 11608 Colusa Butte Sink, near gate of Colusa Gun Club Comment
  CHSC25319  Hibiscus lasiocarpos var. occidentalis Hayes; Warner, Schlising 1977-8-23 49 Colusa Along Putnam Rd., where this road reaches the Butte Creek Drainage, off of Gridley road 5. 50 Comment
  UC1183425  Hippuris vulgaris J. M. Tucker and L. K. Mann 1959-5-30 3528 Colusa ca. 1/4 mi. n.w. Lower Letts Valley (and ca. 4 mi. (airline) n. of Goat Mt. Lookout, Mill Valley); Mill Valley 1219 Comment
  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-BC383129  Holocarpha virgata subsp. virgata Andrew Townesmith; Karen M. Meyer 2007-8-7 907 Colusa Mendocino National Forest, Grindstone Ranger District. Vicinity of Wolf Creek OHV staging area, off Forest Service route M10, 4.2 miles west of intersection with Lodoga-Stonyford road in Stonyford 452 Comment
  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
  UCD55458  Holocarpha virgata subsp. virgata Ellen Dean; Gordon Harrington 2006-10-6 3282 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 374 Comment
  LA207941  Holodiscus discolor A. A. Heller; 1916-6-6 12362 Colusa Coast Range on the grade about 3 mi. W. of Leesville Comment
  CAS-BOT-BC152577  Holodiscus discolor var. discolor A. A. Heller 1916-6-6 12362 Colusa Coast Range on the grade about 3 miels west of Leesville Comment
  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
  UCD164138  Hordeum brachyantherum Craig Thomsen 1997-4-20 1927 Colusa Bear Valley. About 7 miles north of Hwy 20. 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
  UC1745700  Hordeum brachyantherum subsp. brachyantherum Annetta M. Carter, Sarah Dyal, Ethel Crum 1938-5-8 1391 Colusa 5.5 mi. S of Leesville. Bear Valley. 426 Comment
  CAS-BOT-BC284931  Hordeum brachyantherum subsp. californicum Roxana S. Ferris 1926-4-22 6300 Colusa 2 miles west of Colusa Comment
  SD225718  Hordeum depressum Carol Witham, Jennifer Buck 2001-4-30 161 Colusa 2 mi. south of the town of Colusa along Hwy 20, east east of Hwy 20 and the Colusa Airpo9rt, Dolan Ranch site, pool # DOL001 Comment
  UCD85779  Hordeum marinum subsp. gussoneanum A. A. Beetle 1942-5-21 3273 Colusa 12 miles north of Williams. Comment
  CHSC110839  Hordeum marinum subsp. gussoneanum David Isle 1989-5-14 1999 Colusa Stony Creek Watershed. Pendell Ranch--2 miles W of Co. Rd. 306 Jct w/ Fouts Ssprings Road. 150 yards south of Pendell home. 384 Comment
  SEINET241543 Image available Hordeum murinum subsp. glaucum Richard R. Halse 2001-3-22 5946 Colusa Williams 18 Comment
  CHSC83698  Hordeum murinum subsp. leporinum L. P. Janeway 2002-4-24 7521 Colusa Sacramento Valley/Inner North Coast Ranges border. Vicinity of Logan Ridge, Stone Corral Creek, and Funks Creek. 103 Comment
  JEPS80220  Hordeum murinum subsp. leporinum L. R. Heckard and J. Hickman 1980-7-3 5376 Colusa w Summit Springs (sw slope Snow Mountain); sw slope Snow Mountain 1554 Comment
  CHSC83693  Hordeum vulgare L. P. Janeway 2002-4-24 7522 Colusa Sacramento Valley/Inner North Coast Ranges border. Vicinity of Logan Ridge, Stone Corral Creek, and Funks Creek. 103 Comment
  JEPS80245  Horkelia californica subsp. dissita L. R. Heckard and J. Hickman 1980-9-15 5420 Colusa w Summit Springs (Snow Mt.); , w of Summit Springs 1554 Comment
  RSA700357  Horkelia californica subsp. dissita L. P. Janeway, B. Castro 2001-6-3 7100 Colusa Inner N Coast Ranges, Spring at Grapevine Flat, on top of Walker Ridge 0.8km E of Baldy Mtn. Comment
  JEPS95511  Hornungia procumbens Vernon H. Oswald and L. Ahart 1994-4-6 6075 Colusa T16N R7W SW1/4 Sec. 11, 1800 ft, Chaparral. Goat Mtn. Rd. 0.3 mi S of Little Stony Creek Bridge, SW of Digger Pine Flat, SSW of Stonyford 548 Comment
  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
  JEPS81321  Iris fernaldii L. R. Heckard and J. C. Hickman 1982-7-6 5936 Colusa wilderness area above Summit Springs (s side of Snow Mt, near entrance and parking to Snow Mt); Snow Mt. 1584 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
  SEINET3875317  Iris macrosiphon Thomas E. Higley 1974-5-4 066 Colusa 3/4 miles north of T junction of Indian Valley.; 0 853 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
  CDA19079  Isatis tinctoria R. Breckenridge, Kratville 2001-4-3 PDR 958964 Colusa Sacramento Valley; Near the junction of I-5 Southbound and Husted Rd, Williams. 0 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
  RSA30188  Juglans hindsii E. K. Balls, Percy C. Everett 1953-10-14 18670 Colusa Hwy 20, 10.5 miles SW of Williams on road to Clear Lake 183 Comment
Read comments
Jun 18 2011
  JEPS80386  Juncus L. R. Heckard, and J. Hickman 1981-6-22 5619 Colusa Dark Hollow Creek Snow Mt. 1889 Comment
  CHSC62909  Juncus balticus Vernon H. Oswald 1994-4-11 6104 Colusa Sacramento National Wildlife Refuge. Refuge located ca. 7 mi S of Willows, at the SW corner of Tract 39. 25 Comment
  JEPS80274  Juncus balticus L. R. Heckard, and J. Hickman 1980-9-16 5460 Colusa nw slope West Peak (cirque area between peaks, Snow Mt.); Snow Mt., West Peak 2011 Comment
  HSC62947  Juncus balticus subsp. ater Marla J. Carollo 1979-4-14 32 Colusa Bear Valley Rd., 3.9 mi. N of Hwy. 20, next to Bear Creek. 412 Comment
  CHSC49606  Juncus bolanderi Vernon Oswald 1984-7-20 1619 Colusa Letts Lake in Mendocino National Forest. 1402 Comment
  JEPS80247  Juncus bolanderi L. R. Heckard and J. C. Hickman 1980-9-15 5425 Colusa w of Summit Springs; Snow Mt. 1554 Comment
  CHSC112219  Juncus bufonius Lowell Ahart 2013-5-1 18691 Colusa Inner North Coast Range. In a small drainage, north of the wash and State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  CHSC101403  Juncus bufonius var. congestus David Isle 2006-5-6 1571 Colusa East of Maxwell abt 1 mile; S of Maxwell Rd and e of Lyons Rd in north Dirk's organic rice field (check). 30 Comment
  JEPS80387  Juncus covillei L. R. Heckard and J. Hickman 1981-6-22 5620 Colusa along Dark Hollow Creek Snow Mt. 1889 Comment
  JEPS80259  Juncus covillei L. R. Heckard and J. Hickman 1980-9-15 5439 Colusa n of road at Summit Springs (Snow Mountain, Lake-Colusa County Boundary); Snow Mountain, Summit Springs 1524 Comment
  JEPS80246  Juncus effusus subsp. pacificus L. R. Heckard and J. Hickman 1980-9-15 5424 Colusa w of Summit Springs; Snow Mt. 1554 Comment
  JEPS81343  Juncus hemiendytus L. R. Heckard and J. C. Hickman 1982-7-7 5956 Colusa s of (above) Milk Ranch; Snow Mt. 1950 Comment
  JEPS73502  Juncus laccatus L. R. Heckard 1972-7-10 3120 Colusa Trout Creek crossing of trail to Box Springs; Snow Mt. 1828 Comment
  JEPS80269  Juncus occidentalis L. R. Heckard, and J. Hickman 1980-9-16 5452 Colusa e of West Peak (first meadow along trail from Frog Pond in cirque area, Snow Mt.); Snow Mt. 1981 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
  JEPS113745  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
  CHSC107172  Juncus xiphioides L. P. Janeway; B. Castro 2011-5-19 10289 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 1.9 km southeast of Funks Reservoir and 0.2 km northeast of Tehama-Colusa Canal. Large +- alkaline vernal pool/marsh; mucky clay soil. In and adjacent to a shallow swale that drains north into the marsh which is 3 m lower in elevation. 52 Comment
  CHSC111646  Juncus xiphioides David Isle; Justin Isle 1988-5-25 2092 Colusa Mendocino National Forest - North Coast Ranges Middle Fork Stony Creek Watershed. S of Potatoe Hill Rd 17N12 at spring ~1 mile SW of Fouts Springs in the 1987 Fouts Fire secondary fireline rehab. 829 Comment
  SBBG119881  Juncus xiphioides L. Ahart 2006-8-9 13145 Colusa N side and just E of the bridge across Stony Crk, just N of Stonyford 347 Comment
  CHSC81201  Juniperus californica L. P. Janeway; B. Castro 2001-4-12 7017 Colusa Vicinity of Grapevine Creek, Funks Creek, and Antelope Valley. 158 Comment
  JEPS48304  Juniperus californica W. L. Jepson 1932-5-8 16298 Colusa n of Stonyford (w Colusa Co.) 365 Comment
  POM163455  Juniperus californica Roxana S. Ferris 1926-4-23 6456 Colusa 4 miles from [south of] Stonyford on the Leesville Road 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
  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
  JEPS108915  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
  RSA718197  Keckiella corymbosa L. Ahart 2006-8-9 13102 Colusa On the south side of Stony Creek, at Mine Camp, about 3.5 miles (air) west of Stonyford. 422 Comment
  JEPS73503  Kelloggia galioides L. R. Heckard 1972-7-10 3121 Colusa near Trout Crossing of trail to Box Springs (Snow Mt.); Snow Mt. 1828 Comment
  CDA6281  Kickxia spuria F. Argain 1965-11-18 Colusa Norman Road & Main Street, Princeton. 0 Comment
  UCR261653  Koeleria gerardi Ann Howald 2003-4-24 2321 Colusa Inner North Coast Ranges, Indian Valley, west side of East Park Reservoir, spillway overlook 368 Comment
  UCD85747  Koeleria macrantha Beecher Crampton 1958-5-19 4801 Colusa 5.8 miles south of Lodoga. 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
  CHSC80155  Lactuca saligna B. Castro; G. Kuenster 2000-7-19 1211 Colusa Vicinity of Maxwell, Funks Creek, and the Glenn-Colusa canal, on low flat terrace beside S edge of shallow intermittent stream channel draining eastward out of the hills east of Golden Gate. 39 Comment
  CAS-BOT-BC341395  Lagophylla minor R. F. Hoover 1938-4-24 3226 Colusa Ridge between Venado and Leesville Comment
  CHSC70966  Lagophylla minor Vernon Oswald; Lowell Ahart 1998-5-7 8998 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
  CHSC94692  Lagophylla minor Lowell Ahart 2006-6-11 12667 Colusa On the east side of an off road trail (Trail 30), about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford. 613 Comment
  HSC96892  Lagophylla minor L. Ahart 2006-6-11 12667 Colusa E side of an off road trail (Trail 30), about 100 yards S of Fouts Rd., about 5 mi. W of Stonyford 613 Comment
  JEPS110184  Lagophylla minor Lowell Ahart 2006-6-11 12667 Colusa On the east side of an off road trail (Trail 30), about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford 613 Comment
  RSA0118780  Lagophylla minor Lowell A. Ahart 2013-5-1 18680 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
  CDA8085  Lagophylla minor Vernon H. Oswald & Lowell Ahart 1998-5-7 8998 Colusa Bartlett Springs Road 2.1 miles west of Bear Valley Road, 0.8 mile east of Sawtelle Valley and Grapevine Flat roads. Comment
  JEPS38990  Lagophylla minor W. L. Jepson 1938-6-9 18959 Colusa mts. betw. Indian Valley (Lake Co.) and Bear Valley (Colusa Co.) 579 Comment
  JEPS81971  Lagophylla minor Rimo Bacigalupi, T. Crovello, and L. Heckard 1965-4-26 9046 Colusa on road to Bartlett Springs 2 mi from Ladoga junction (summit w of Bear Valley, Colusa-Lake County boundary) 670 Comment
  RSA0011767  Lagophylla minor A. A. Heller 1940-5-6 15578 Colusa On State Hwy 20, 2 miles W of the junction with Hwy 16. Comment
  UCD82369  Lagophylla minor Robin McMaster 1973-4-15 341 Colusa 0.5 mi towards Bartlett Springs from Bear Valley Road. Comment
  UCD82588  Lagophylla minor Craig D. Thomsen; J. Wiegand, S. Harrison, G. Harrington, A. Fulks 2008-4-22 2733 Colusa Walker Ridge. Along Walker Ridge Rd., 3.5 mi N of Hwy 20. 1005 Comment
  JEPS119421  Lagophylla ramosissima G. K. Helmkamp, E. A. Helmkamp 2009-5-20 14740 Colusa Central Inner Coast Ranges, along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 Comment
  JEPS80244  Lagophylla ramosissima L. R. Heckard and J. Hickman 1980-9-15 5419 Colusa slopes w of Summit Springs; Snow Mt. 1554 Comment
  UCD61466  Lagophylla ramosissima Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3912 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 1.5 miles SW of parking lot in Eula Canyon. 310 Comment
  UCR206352  Lagophylla ramosissima George K. Helmkamp, E. A. Helmkamp 2009-5-20 14740 Colusa Central Inner Coast Ranges, along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 320 Comment
  CAS-BOT-BC337916  Lasthenia californica Joshua Suchocki; Charlene Vullo; Kyle Wear 1995-4-1 46 Colusa Along Bear Valley Rd., 1.2 miles west of the junction with Brim Rd. 414 Comment
  UC90030  Lasthenia ferrisiae K. Brandegee Apr 1889 Colusa Colusa Junction Comment
  CAS-BOT-BC353479  Lasthenia fremontii Mrs. Alvin Seale 1932-4-17 s.n. Colusa unspecified Comment
  CAS-BOT-BC352922  Lasthenia glaberrima J. M. Tucker 1978-5-6 4408 Colusa West side of Bear Valley Road, 11 miles (by road) north of junction with State Hwy 20 396 Comment
  CAS-BOT-BC352923  Lasthenia glaberrima J. M. Tucker 1978-5-6 4408 Colusa West side of Bear Valley Road, 11 miles (by road) north of junction with State Hwy 20 396 Comment
  HSC83436  Lasthenia glaberrima J. M. Tucker 1978-5-6 4408 Colusa W side of Ber Valley Rd., 11 mi N of jct with State Hwy 20 366 Comment
  JEPS118673  Lasthenia glaberrima B. Castro and L. P. Janeway 2011-4-27 1862 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; approximately 1 mi southeast of Funks Reservoir and 800 ft northeast of Tehama-Colusa Canal. Sites 7.5' quad. Comment
  UCD133750  Lasthenia glaberrima J. M. Tucker 1978-5-6 4408 Colusa On west side of Bear Valley Road, 11 miles (by road) north of junction with State Highway 20. 365 Comment
  HSC60475  Lasthenia glabrata J. P. Smith 1977-4-24 9041 Colusa Along Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  UCR212333  Lasthenia glabrata subsp. glabrata Craig D. Thomsen 2000-3-31 2046 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mi west of Hwy 20/16 intersection, milepost 3.00 310 Comment
  POM288884  Lasthenia glabrata subsp. glabrata Lyman Benson 1933-4-16 4331 Colusa 5 miles east of Lake County line. Mt. Range: Inner N. Coast; Watershed: N. Fork Cache Creek. 457 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
  UCD132538  Lasthenia gracilis Beecher Crampton 1958-4-21 9169 Colusa 3.5 miles N.W. of Lodoga by road. Comment
  UCD15423  Lasthenia gracilis Margit Sands 1985-4-13 26 Colusa in Bear Valley, 3.8 miles north of Wilbur Hot Springs rd.; 390 Comment
  JEPS127615  Lathyrus jepsonii var. californicus B. Castro with Tom Boullion 2008-6-4 1733 Colusa Ca 5 air miles N of Colusa, ca 0.5 mi E of Hwy 45 off N edge of Reservation Road. On upper terrace within levee, overlooking riprap-lined bend in the Sacramento River (River-mile 154.3). Comment
  JEPS80788  Lathyrus jepsonii var. californicus L. R. Heckard and J. C. Hickman 1981-7-30 5761 Colusa se side of Snow Mountain, Trout Creek Trout Creek; Snow Mountain, Trout Creek 1584 Comment
  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-BC323901  Layia chrysanthemoides Mrs. H. C. Cantelow 1936-4-11 1155 Colusa Bear Creek Canyon. 396 Comment
  CHSC55474  Layia chrysanthemoides Barbara Adams 1991-4-6 13 Colusa Ca 0.3 mi west of junction of Hwys 20 and 16, south side of Bear Creek, ca 18 mi southwest of Williams. 321 Comment
  CHSC82611  Layia chrysanthemoides Tara Morgan 2002-4-6 16 Colusa Found in Bear Valley located west of Highway 5 and north of Highway 20 within pastures. 385 Comment
  CHSC83299  Layia chrysanthemoides Jenny Marr; Heidi West, Joyce Lacey-Rickert, Caroline Warren 1998-5-8 Colusa Vicinity of Sites and Antelope Valley. 152 Comment
  JEPS39184  Layia chrysanthemoides W. I. Follette 1935-3-31 Colusa Williams Comment
  UCD163205  Layia chrysanthemoides Craig D. Thomsen 2000-3-31 2073 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 0.3 mile west of Hwy 20/16 intersection. 345 Comment
  UCD133958  Layia chrysanthemoides J. M. Tucker; Dorothy Dreyfus 1967-4-29 4035 Colusa at south end of Bear Valley. 6.3 miles north of junction of Bear Valley Road with State Highway 20. 426 Comment
  UCD135673  Layia chrysanthemoides Bruce G. Baldwin 1986-4-13 596 Colusa Bear Valley, immediately west of Bear Valley Road, 7.3 miles north of junction with California State Highway 20. Comment
  HSC85782  Layia fremontii Jeff Dunk, Tallchief Comet, David Munger 1987-4-12 66 Colusa Comment
  UCD15425  Layia fremontii Margit Sands 1985-4-13 28 Colusa in Bear Valley, 3.8 miles north of Wilbur Hot Springs rd.; 390 Comment
Read comments
Apr 18 2009
  UC89185  Layia gaillardioides Katharine Brandegee Apr 1889 Colusa Leesville Comment
  JEPS119407  Layia platyglossa G. K. Helmkamp, E. A. Helmkamp 2009-1-31 14314 Colusa Sacramento Valley, junction of Moon Bend Road and CA-20 at the south end of the city of Colusa. Comment
  UC638682  Layia septentrionalis Ethel Crum 1938-5-7 2013 Colusa 4 mi ne of Rumsey; Comanche Hills 254 Comment
  UCR261680  Layia septentrionalis Ann Howald 2003-4-23 2311 Colusa Inner North Coast Ranges, Indian Valley, East Park Reservoir, Catholic Point peninsula, east of Coppermine Road, c. 0.2 mi north of intersection with East Ruby King Road 425 Comment
  CAS-BOT-BC274325  Leersia oryzoides Herbert L. Mason 1945-9-19 12715 Colusa Below causway over Butte Sink spillway, east bank of Sacramento River, 1 mile above Colusa Comment
  CAS-BOT-BC527293  Lemna trisulca J. M. Tucker; L. K. Mann; John Tothill 1959-5-30 3532 Colusa On small lake in Mill Valley, ca. 1/4 mile northwest of Lower Letts Valley, and ca. 4 airline miles, north of Goat Mountain Lookout Comment
  RSA141287  Lemna trisulca J. M. Tucker, L. K. Mann, John Tothill 1959-5-30 3532 Colusa Small lake in Mill Valley, ca. 1/4 mile northwest of Lower Letts Valley, and ca. 4 miles, airline, north of Goat Mountain Lookout 1220 Comment
  SEINET8201321 Image available Lemna trisulca J. M. Tucker, L. K. Mann, John Tothill 1959-1 3532 Colusa Mill Valley Comment
  UC117628  Lepidium dictyotum var. acutidens K. Brandegee Apr 1889 Colusa Colusa Junction Comment
  CHSC79711  Lepidium dictyotum var. dictyotum L. P. Janeway; B. Castro 2000-3-23 6635 Colusa Vicinity of Funks Creek and Glenn-Colusa Canal. 47 Comment
  UCD63721  Lepidium draba Craig D. Thomsen 2008-5-31 2761 Colusa BLM Payne Ranch. Southwest of intersection of Hwy 16 and Hwy 20. Along entry road into Cowboy Camp from Hwy 16, 1 mile south of Hwy 20. 320 Comment
  UCR233291  Lepidium lasiocarpum George K. Helmkamp, E. A. Helmkamp 2011-4-1 17134 Colusa Eastern foothills North Coast Ranges, Antelope Valley, along Maxwell-Sites Road, 2.0 miles southeast of Sites 85 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
  UC398784  Lepidium latipes Brandegee Apr 1889 Colusa Colusa Junction Comment
  CAS-BOT-BC89888  Lepidium nitidum Roxana S. Ferris 1917-4-12 719 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
  CHSC115390  Lepidium nitidum var. nitidum Lowell Ahart 2015-4-1 19990 Colusa Burned over in 2012, rocky serpentine outcrop on the north side of State Highway 20, 1/2 mile east of Lake County Line, 12 miles (air) east-northeast of Clear Lake (town), 17 miles (air) west of Williams. Inner Coast Range. 520 Comment
  CHSC79002  Lepidium strictum J. Marr; C. Warren, H. West, N. Wight 1998-6-11 Colusa West of Maxwell, vicinity of Logan Ridge and Funks Creek. 114 Comment
  UC72926  Lepidium strictum Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  JEPS75064  Leptochloa fascicularis W. L. Jepson 1929-10-1 15344 Colusa Maxwell 25 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
  UCD118630  Leptosiphon bicolor Clinton C. Shock 1980-5-3 57 B Colusa Bear Valley, about 12 miles north of State Highway 20. 384 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
  RSA137124  Leptosiphon bicolor Verne Grant 1960-4-10 10187 Colusa Foothills west of Williams on hwy 20. 396 Comment
  RSA388851  Leptosiphon bicolor Eugene Tanimoto 1975-4-20 s.n. Colusa Bear Valley Road, 8.7 miles north of State Highway 20. Comment
  CHSC79791  Leptosiphon bolanderi L. P. Janeway; B. Castro 2000-5-4 6706 Colusa Vicinity of Grapevine Creek and Sites-Lodoga Road. 262 Comment
  UCD55171  Leptosiphon bolanderi Kim E. Steiner 1978-4-29 202 Colusa Walker Ridge Road; 1.5 miles N of State Hwy 20. 777 Comment
  UCD55172  Leptosiphon bolanderi Kim E. Steiner 1978-4-29 202 Colusa Walker Ridge Road; 1.5 miles N of State Hwy 20. 777 Comment
  CHSC40735  Leptosiphon ciliatus L. Constance 1938-4-22 2149 Colusa Above Salt Creek, Lower Lake-Williams road 11 mi. NE. of Lake-Colusa line, Inner North Coast Ranges. 152 Comment
  CHSC61230  Leptosiphon ciliatus Siegel 1977-4-16 8 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 10 mi wsw of Williams. 143 Comment
  HSC65995  Leptosiphon ciliatus Cathie Goldberg, Lynn Kunstman, Lauren Philbrick, Geoff Walsh 1980-4-19 51 Colusa Leesville Rd. from Leesville to Williams, 3.8 mi. E of Leesville Comment
  UCD163880  Leptosiphon ciliatus Craig D. Thomsen 2002-3-27 2575 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection. Comment
  HSC48171  Leptosiphon filipes Thomas W. Nelson, Jane P. Nelson 1978-4-29 3935 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  CHSC1269  Leptosiphon parviflorus V. Holt 1935-5-12 Colusa Stonyford. Comment
  UC1613491  Leptosiphon parviflorus Charles M. Belshaw 1937-4-25 2829 Colusa Inner North Coast Range: Cooks Springs, Devils Ridge Comment
  CHSC32205  Lesquerella occidentalis subsp. occidentalis James Jokerst 1980-8-7 1067 Colusa North Coast Ranges. Near Snow Mountain (west). Comment
  NY180562  Lessingia adenophora M. K. Curran 1884-1 s.n. Colusa At Epperson's Comment
  UC1563897  Lessingia micradenia var. glabrata Barbara Ertter with Elizabeth Neese, Laura Fujii, and Dawn Espindola 1989-10-21 8868 Colusa Brim Road sw Leesville (to Indian Valley Reservoir) 609 Comment
Read comments
Feb 20 2012
  CAS-BOT-BC341802  Lessingia nemaclada Walter Knight; Irja Knight 1963-9-23 113 Colusa Between Leesville and Wilbur Springs Comment
  CAS-BOT-BC123028  Lessingia ramulosa M. K. Curran 1884-1-1 s.n. Colusa At Epperson's Comment
  RSA0118883  Lessingia ramulosa Lowell Ahart 2013-10-1 19068 Colusa Inner North Coast Range. North of the wash and State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  UCD163655  Lessingia ramulosa Craig Thomsen 1998-6-10 1953 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCD58177  Lessingia ramulosa Gordon Harrington 2007-5-31 68 Colusa BLM Payne Ranch. Lands to the SW of the intersection of Hwy 16 and Hwy 20. Along Thompson Creek, approximately 3/4 mile downstream from Road Kill Cafe. 357 Comment
  UCD66698  Lessingia ramulosa Craig D. Thomsen 2000-6-23 2400 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UC88009  Lessingia ramulosa J. W. Blankinship Colusa near Epperson's Comment
  HSC31308  Lewisia rediviva Carter Schleicher 1974-5-4 25 Colusa 0.75 mi. from T junction of Walker Ridge Rd. and Indian Valley, near Clyde Mine 854 Comment
  CDA34116  Limnanthes alba P. Hiatt 1979-4-26 7 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  UCD33936  Limnanthes douglasii subsp. nivea Beecher Crampton 1958-4-21 9167 Colusa Colusa County, 1 mile west of Lodoga. Comment
  UCD33937  Limnanthes douglasii subsp. nivea Beecher Crampton 1958-4-21 9168 Colusa Colusa County, 2 miles W.N.W. of Lodoga. Comment
  SEINET8729331 Image available Linanthus bakeri Herbert L. Mason 1941-1 12404 Colusa Three miles south of Stonyford. Comment
  SEINET12326983  Linanthus bicolor E. J. Baker 1984-1 16 Colusa Salt Canyon, N side of Salt Creek, Hwy 20, 11 mi WSW of Williams 143 Comment
  CHSC112227  Linanthus ciliatus Lowell Ahart 2013-5-1 18668 Colusa On the east side of Bear Valley Road, about 2 1/2 miles (by road) northwest of the intersection of State Highway 20 and Bear Valley Road. 533 Comment
  UC73621  Linanthus ciliatus Miss Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  UCD41198  Linanthus ciliatus James Salyards 1986-5-17 86 - Colusa Along Sites-Lodoga Rd., 8.2 mi. west of Sites. Comment
  CHSC53973  Linanthus dichotomus Vernon H. Oswald 1991-4-21 4519 Colusa Goat Mountain Rd, 0.4 mi southwest of Lodoga Stonyford Rd, south of Stonyford. 390 Comment
  UCD118534  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
  CDA40096  Linanthus parviflorus Vernon H. Oswald & Lowell Ahart 1998-5-7 9006 .1 Colusa Bartlett Springs Road 2.1 miles west of Bear Valley Road, 0.8 mile east of Sawtelle Valley and Grapevine Flat roads. Comment
  JEPS39670  Linanthus parviflorus Rimo Bacigalupi, and T. Crovello, and L. Heckard 1965-4-26 9047 Colusa 2.5 mi from Ladoga junction (at summit w of Bear Valley on road to Bartlett Springs, Colusa-Lake County boundary) 670 Comment
  JEPS80136  Linanthus rattanii L. R. Heckard with J. Hickman 1980-7-2 5296 Colusa just above Summit Spring entrance to Snow Mt. Trail (ca 10 mi w of Stonyford, Colusa-Lake County boundary); Snow Mt. 1630 Comment
  RSA113934  Lithophragma campanulatum H. K. Sharsmith 1953-7-1 4403 Colusa Above Linger Longer Camp. Goat Mountain. Mendocino National Forest. 1616 Comment
  UCR261726  Lithophragma parviflorum var. parviflorum Ann Howald 2003-5-26 2342 A Colusa Inner North Coast Ranges, Indian Valley, East Park Reservoir, Catholic Point peninsula, east of Coppermine Road, c. 0.2 mi north of intersection with East Ruby King Road 425 Comment
  UC1614399  Logfia filaginoides Charles M. Belshaw 1937-4-25 2882 Colusa vicinity of Cook's Spring, Devil's Ridge. Inner N coast range Comment
  UCD57556  Lolium multiflorum Andrew Pedersen; with Plant Biology 102 2007-4-29 5 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Meadow on the west side of State Route 16, ca. 2 road miles south of intersection with State Route 20. West side of Bear Creek, near confluence with Craig Creek. 304 Comment
  CAS-BOT-BC283547  Lolium multiflorum Roxana Stinchfield 1916-6-17 279 Colusa Road to Tule near College City Comment
  CAS-BOT-BC269050  Lolium perenne Roxana Stinchfield 1916-6-17 491 Colusa Road to Tule near College City Comment
  UCD56941  Lomatium Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3543 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Thompson Canyon. 349 Comment
  CHSC91217  Lomatium californicum D. Isle 2003-6-4 370 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. 0.2 mi. W of M-10/M-5 jct. on N. edge of M-10. 621 Comment
  UCD80835  Lomatium californicum Ellen Dean; G. Harrington, J. Alderson, M. Bibbo, B. Rice 2009-3-25 5292 Colusa BLM Bear Creek (Payne) Ranch, lands to the SW of the jct of Hwys 16 and 20. South side of canyon that is located to the north of Brophy Canyon. 274 Comment
  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
  UCD127607  Lomatium californicum D. Sanchez-Mata 1998-7-10 s.n. Colusa Stonyford. Fouts Springs Road. 640 Comment
  HSC21551  Lomatium ciliolatum var. hooveri Lincoln Constance 1965-4-13 3756 Colusa Between Clear Lake Oaks and Williams, Hwy. 20, 2.7 mi. W of Hwy. 16 549 Comment
  CHSC91009  Lomatium dasycarpum subsp. tomentosum D. Isle 2002-4-18 289 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. N of Motorcycle info. Center and Fouts Spring Rd., above 18N01.2 jct. w/ OHV trail. 451 Comment
  UCD163350  Lomatium dissectum Craig D. Thomsen 2000-5-12 2332 Colusa Walker Ridge. Along road to Elgin Mine. Comment
  CHSC70858  Lomatium hooveri Vernon Oswald; Lowell Ahart 1998-4-21 8943 Colusa Stonyford-Logoda Rd. 3.7 mi south of Stonyford. 384 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
  UC1312855  Lomatium hooveri L. Constance 1965-4-13 3756 Colusa between Clear Lake Oaks and Williams (Hwy. 20 2.7 mi. w. of Hwy. 16) 548 Comment
  UC903739  Lomatium hooveri Milo S. Baker 1947-4-6 11646 Colusa near Hwy. 20 ca. 1 mi. e. Lake-Colusa Co. line Comment
  UCR261643  Lomatium hooveri Ann Howald 2003-3-26 2288 Colusa Inner North Coast Ranges, Indian Valley, East Park Reservoir, Catholic Point peninsula, near Coppermine Road, c. 0.3 mi northwest of intersection with East Ruby King Rd. 419 Comment
  CHSC116064  Lomatium macrocarpum Richard R. Halse 2014-3-25 9033 Colusa Along the Leesville-Logoda Road ca. 5.6 miles south of Logoda; Indian Valley. 425 Comment
  CHSC42612  Lomatium macrocarpum Vernon Oswald 1986-3-25 1053 Colusa Fouts Springs Rd. (M10) at Diversion Dam Campground 3.4 mi w of Rd. 306. 411 Comment
  RSA0036993  Lomatium macrocarpum Lowell A. Ahart 2013-5-1 18676 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
  RSA0060080  Lomatium macrocarpum Richard R. Halse 2014-3-25 9033 Colusa Along the Leesville-Logoda Road ca. 5.6 miles south of Logoda; Indian Valley. 425 Comment
  SEINET8693961  Lomatium macrocarpum R. R. Halse 2014-3-25 9033 Colusa Along the Leesville-Logoda Road ca. 5.6 mi S of Logoda; Indian Valley. 425 Comment
  UCD163700  Lomatium macrocarpum Craig Thomsen 1999-5-10 2009 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  CHSC77910  Lomatium marginatum var. purpureum Beth Hendrickson; Heidi West 1999-3-23 Colusa Vicinity of Sites and Stone Corral Creek. 121 Comment
  JEPS16221  Lomatium utriculatum Rimo Bacigalupi and Arthur Holmgren 1950-4-25 3177 Colusa 10 mi. n.w. Sites (Grapevine Grade to Lodoga) Comment
  UC1053478  Lomatium utriculatum Rimo Bacigalupi and Arthur Holmgren 1950-4-25 3177 Colusa 10 mi. n.w. Sites (Grapevine Grade to Lodoga) Comment
  UC630426  Lomatium utriculatum Annetta Carter 1938-5-8 1393 Colusa 6 mi S of Leesville (Bear Valley, Wilbur Springs road); Inner North Coast Range 426 Comment
  UCD57859  Lomatium utriculatum Gordon Harrington 2007-4-17 29 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Destanella Flat, just south of Hwy 20, approximately 3.4 road miles west of the Hwy 16 intersection. 553 Comment
  UCD64263  Lomatium utriculatum Craig D. Thomsen 2000-3-31 2060 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UC1299566  Lonicera interrupta Freed W. Hoffman 1948-6-29 2505 Colusa crossing at North Fork Stony Creek North Coast Ranges Comment
  UCD63113  Lonicera interrupta Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4944 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20. 384 Comment
  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
  JEPS80249  Lonicera involucrata var. ledebourii L. R. Heckard, and J. Hickman 1980-9-15 5428 Colusa slopes below Summit Springs (Lake-Colusa County boundary); Snow Mt. 1524 Comment
  CAS-BOT-BC198625  Lotus Roxana S. Ferris 1917-4-14 577 Colusa Foothills 7 miles west of Arbuckle, Arbuckle-Rumsey Road. 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
  UCR227340  Lotus denticulatus Craig D. Thomsen 2000-6-23 2385 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
  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
  UCR71533  Lotus grandiflorus var. mutabilis L. R. Heckard 1969-5-28 2263 Colusa Along Trough Spring Ridge road 1/2 mi. SW of junction with theStonyford-Fouts Spring road (c. 5 mi. west of Stonyford). 732 Comment
  UCR206894  Lotus humistratus George K. Helmkamp, E. A. Helmkamp 2009-3-11 14363 Colusa Inner North Coast Range Foothills, along CA-20, 9.7 miles southwest of Williams, on the north side of Salt Creek 162 Comment
  HSC72772  Lotus humistratus J. Krajanowski 1981-4-4 7 Colusa Salt Canyon, N side of Salt Creek, Hwy. 20, 11 mi. WSW of Williams 143 Comment
  JEPS110414  Lotus purshianus var. purshianus Lowell Ahart 2006-8-9 13112 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford 455 Comment
  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
  UCR205138  Lotus purshianus var. purshianus George K. Helmkamp, E. A. Helmkamp 2008-10-14 14242 Colusa Sacramento Valley, along CA-20, 0.2 mile east of the Sutter County line 9 Comment
  UCD65955  Ludwigia hexapetala B. J. Grewell 2006-9-15 06- 67 -LU Colusa Colusa National Wildlife Refuge, south of Hwy 20, west of Colusa and Sutter Buttes. Glenn-Colusa Irrigation District West Lateral Canal at western refuge boundary, public auto tour route. 13 Comment
  CHSC33400  Lupinus Rene T. Retuta 1978-4-4 8 Colusa Ca. 0.3 mi w of jct. of Hwys. 20 and 16, s side of Bear Creek, ca 18 mi. sw of Williams. 579 Comment
  UC726672  Lupinus A. A. Heller 1940-4-21 15542 Colusa along U.S. Highway #99W, 2 mi s Williams Comment
  JEPS81378  Lupinus adsurgens L. R. Heckard and J. C. Hickman 1982-7-8 5989 Colusa 1/4 mi sw East Peak (Snow Mt.); , sw of East Peak 2087 Comment
  HSC89790  Lupinus albifrons L. Blackford, S. Branch, D. Malm 1988-4-16 71 Colusa 15.3 mi. off Hwy. 20 on Walker Ridge Rd. 915 Comment
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Aug 20 2014
  HSC91367  Lupinus albifrons A. Smith, A. Eller, B. Hoffman 1989-4-15 23 Colusa 3 mi. SW of Digger Pine Campground, on Goat Mtn. Rd. 152 Comment
  POM163513  Lupinus albifrons var. albifrons Roxana S. Ferris 1926-4-23 6422 Colusa Near summit on grade. Williams- Stonyford Road. Comment
  JEPS80459  Lupinus albifrons var. collinus Alice Q. Howard 1972-7-10 14 Colusa between Dark Hollow and Paradise Creeks; between Dark Hollow and Paradise Creeks 1402 Comment
  RSA799177  Lupinus albifrons var. collinus George K. Helmkamp, E. A. Helmkamp 2011-4-1 17121 Colusa Eastern foothills North Coast Ranges: Antelope Valley, along Maxwell-Sites Road, 0.4 mi southeast of Sites. 77 Comment
  UCD66966  Lupinus albifrons var. collinus Ellen Dean; Davis Botanical Society 2008-5-31 5010 Colusa west of I-5 at Maxwell, east slope of Goat Mountian, along Goat Mountain Road, between Cedar grove campground and the summit, near crossing of tributary of Little Stoney Creek. 1309 Comment
  UCD67041  Lupinus albifrons var. collinus Ellen Dean; Davis Botanical Society 2008-5-31 5021 Colusa west of I-5 at Maxwell, Goat Mountain, ridge below summit off of Goat Mountain Road. 1734 Comment
  UCD83748  Lupinus albifrons var. collinus Ellen Dean; G. Harrington, K. Mawdsley, J. Shepard 2010-5-1 5945 b Colusa Walker Ridge. Along Walker Ridge Road at intersection with road to Eaton Springs. Roadside, on E side of road. 927 Comment
  HSC89708  Lupinus albifrons var. eminens Eric German, Klara Varga, Michele Cardinaux 1989-4-15 36 Colusa 3 mi. SW of Digger Pine Campground on Goat Mtn. Rd. 152 Comment
  JEPS81297  Lupinus bicolor L. R. Heckard with J. C. Hickman 1982-7-5 5911 Colusa below Summit Springs (S side Snow Mt.) Comment
  SEINET5328111  Lupinus bicolor R. R. Halse 2002-3-21 6131 Colusa Williams; by junction 5th St. and B St. 24 Comment
  UCD163666  Lupinus bicolor Craig Thomsen 1999-4-15 1966 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCD83718  Lupinus bicolor Joseph Schlottman; with PLB 102 class 2010-5-2 4 Colusa East slope of Walker Ridge. Eaton Springs. Adjacent to main creek. 710 Comment
  UCR233443  Lupinus bicolor George K. Helmkamp, E. A. Helmkamp 2011-4-1 17131 Colusa Eastern Foothills North Coast Ranges, Antelope Valley, along Maxwell-Sites Road, 0.4 miles southeast of Sites 93 Comment
  UCD15277  Lupinus bicolor Claire Warshaw 1985-4-13 21 Colusa along Bear Valley Road, 45 miles northwest of intersection with Highway 22. 420 Comment
  HSC45663  Lupinus densiflorus var. aureus Howee Barban 1978-4-22 16 Colusa Bear Valley Rd., 1.5 mi. from its junction with State Route 20 412 Comment
  HSC85822  Lupinus densiflorus var. aureus David Munger, Jeff Dunk, Tallchief Comet 1987-4-12 72 Colusa Comment
  SEINET10485227  Lupinus densiflorus var. aureus Clemens 1977-4-16 CLEMENS 17 Colusa Moderate population, salt creek canyon, n side of salt creek, hwy 20, 10 mi w-sw of williams. Wilbur springs quad, t.15n, r.4w, sec.32, 15 ft e central border. Open bank along roadside. 143 Comment
  UCR228655  Lupinus latifolius var. latifolius Ellen Dean, Davis Botanical Society 2008-5-31 5001 Colusa West of Hwy I-5 at Maxwell, east slope of Goat Mountain along Goat Mountain Road 1100 Comment
  CHSC78515  Lupinus luteolus Vernon H. Oswald 2000-8-21 9950 Colusa Bear Valley near the junction of Bear Valley and Brim roads. 411 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
  UC763972  Lupinus luteolus R. F. Hoover 1938-6-11 3595 Colusa Williams-Lake Co. highway at junction Wilbur Sprs road 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
  CHSC71113  Lupinus microcarpus var. densiflorus Jan Monelo 1989-4-1 7 Colusa In hillside spanning Hwy 20. Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. 143 Comment
  UC614570  Lupinus microcarpus var. densiflorus L. Constance 1938-4-22 2147 Colusa 11 mi ne Lake-Colusa line (above Salt Creek); Inner North Coast Ranges, above Salt Creek 152 Comment
  UC726766  Lupinus microcarpus var. densiflorus A. A. Heller 1940-5-6 15576 Colusa on steep clay banks along State Hwy #20 about 3 mi e junction with Highway #16 Comment
  UCD57462  Lupinus microcarpus var. densiflorus Ellen Dean; W. Murray, J. Alderson, B. Weiss, M. Starbuck 2007-4-7 3642 Colusa Payne Ranch (owned by BLM), lands just west of Hwy 16, about 2 road miles south of junction of Hwy 20 and Hwy 16. Mouth of Craig Canyon, along unimproved road. 316 Comment
  JEPS108050  Lupinus microcarpus var. densiflorus Rhonda Riggins 1982-5-30 1448 Colusa Roadside Ladoga-Leesville Road, 4.4 mi N Leesville. 457 Comment
  SBBG3591  Lupinus microcarpus var. densiflorus H. and M. Dearing 1933-5-24 693 Colusa 25 mi W of Williams Comment
  SEINET239852  Lupinus microcarpus var. densiflorus Rhonda Riggins 1982-5-30 1 /20 Colusa Roadside Ladoga-Leesville Road. 4.4 miles north of Leesville. 457 Comment
  UC614851  Lupinus microcarpus var. densiflorus Beryl O. Schreiber 1932-4-3 223 Colusa road to Williams; road to Williams 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
  UCD33935  Lupinus nanus Beecher Crampton 1958-4-21 9166 Colusa 1 mile west of Lodoga. Comment
  RSA424766  Lupinus nanus var. apricus Aaron Liston, M. Blumler 1987-4-26 667 -9 Colusa Bear Valley - Lodoga Road, 6.6 miles S of Bartlett Springs Jct. Comment
  CHSC90384  Lupinus succulentus Martin Polsan 1988-4-9 16 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. 143 Comment
  HSC72173  Lupinus succulentus J. P. Smith, Jane P. Nelson, Thomas W. Nelson 1978-4-2 9550 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  SEINET9325857  Lupinus succulentus Unknown 2009-5-20 14735 Colusa Glasscock Mountain Comment
  SEINET12161340  Lupinus succulentus D. M. Burk 1978-1 87 Colusa 5.1miW of Walker Ridge Rd, Hwy 20. Wilbur Springs Quad 15'. S35 T14N R6W 457 Comment
  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
  CDA5761  Lycium barbarum G. D. Barbe 1975-10-23 2091 Colusa 7th and Market Streets, Colusa. 0 Comment
  UCD163325  Lycium barbarum Craig D. Thomsen 1997-4-19 1908 Colusa Wilbur Springs. About 4 miles north of Hwy 20. Vicinity of Blank Spring, about 0.75 miles west of Wilbur Hot Springs hotel, adjacent to Sulphur Creek. Comment
  RSA127531  Lycopus americanus Milo S. Baker 1946-9-4 11603 Colusa Butte Sink, West Gridley Road, in a wet spot. Comment
  CHSC107980  Lythrum californicum B. Castro; Joe Silveira, Tom Boullion 2011-6-10 1883 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; ca 5 air mi NW of Maxwell, I mi southeast of Funks Reservoir and 0.2 mi northeast of Tehama-Colusa Canal. Ca 100 ft E of large +- saline/alkaline wetland/marsh, on S edge of compacted E-W road track that goes through marsh. 49 Comment
  CHSC94496  Lythrum californicum Lowell Ahart 2006-8-9 13160 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 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
  RSA0014829  Lythrum californicum L. Ahart 2006-8-9 13160 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
  SBBG119884  Lythrum californicum L. Ahart 2006-8-9 13160 Colusa N side and under bridge across Stony Crk, just N of Stonyford 347 Comment
  UCD102989  Lythrum californicum Dick Johnson 1977-6-15 s.n. Colusa West of Williams rangeland. Comment
  CHSC86838  Lythrum hyssopifolia 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
  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
  NY365796  Lythrum salicaria L. Ahart 1980-6-11 2371 Colusa 9½ miles north of Colusa. Valley Grassland. 35 Comment
  CHSC106708  Lythrum tribracteatum Barbara Ertter; Elizabeth Neese, laure Fujii, Dawn Espindola 1989-10-21 8870 Colusa SE end of East Park Reservoir N of Lodoga, narrow strand on shaly substrate. 365 Comment
  CHSC115003  Lythrum tribracteatum Lowell Ahart 2015-4-28 20113 Colusa North side of Maxwell-Colusa Road, about 5 1/2 miles east of Maxwell. 53 Comment
  CHSC86784  Lythrum tribracteatum Jenny Marr; Heidi West, Caroline Warren 1998-7-1 Colusa Vicinity of Sites, Golden Gate, Stone Corral Creek, and Funks Creek. 103 Comment
  JEPS104406  Lythrum tribracteatum Lowell Ahart 2003-10-23 10667 Colusa On the e strand of East Park Reservoir, ca 1/8 mi nw of Sites Lodoga Rd, ca 1 mi n of Lodoga, ca 21 mi w of Maxwell. 368 Comment
  UC1609445  Lythrum tribracteatum Vernon H. Oswald and Lowell Ahart 1993-5-27 5429 Colusa 0.5 mi nw of Sites (bordering the w side of Sacramento Valley, Sites-Lodoga Road); Sacramento Valley, Sites-Lodoga Road 121 Comment
  CAS-BOT-BC342679  Madia elegans Walter Knight; Irja Knight 1963-9-23 103 Colusa Near Stony Ford Comment
  UCR258102  Madia elegans subsp. elegans Bart O'Brien 1991-9-11 s.n. Colusa Central Western; Inner North Coast Ranges, Bear Valley Rd., 9.5 miles north of Old Wilbur [Springs] Rd. turnoff 409 Comment
  JEPS108730  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
  CHSC89612  Madia gracilis B. Castro; Aric Lester, Shirley Innecken 2004-4-12 1446 Colusa Vicinity of Antelope Valley, Huffmaster Road, and headwaters of Lurline Creek. Near bottom of secluded E-W trending side-canyon. 167 Comment
  JEPS119423  Madia gracilis G. K. Helmkamp, E. A. Helmkamp 2009-5-20 14753 Colusa Inner North Coast Ranges, along CA-16, 1.8 miles north of the Yolo County line Comment
  CHSC110854  Malacothamnus fremontii David Isle; Rhonda Isle 2013-6-23 2044 Colusa Just E of Maxwell Grade Summit and pass; hot-burned S aspect slope N of Sites Lodoga Road (at Grapevine Pass). In July 2012 Sites Fire Area. 562 Comment
  CHSC115622  Malacothamnus fremontii David Isle; Frank Elliott 2014-6-11 2134 Colusa Northern Sacramento Foothills: Frand and Judy Elliott Ranch, 1 mile S of Rail Canyon Rd. Jct. with Ssites-Lodoga Rd. and 1/2 mile S of Sites-Lodoga Rd. SE of Elliott home. (GPSs for Rail Canyon Rd. Jct./Sites-Lodoga Rd.) 10S-0546594E, 4356133N). Comment
  POM282851  Malacothamnus helleri Lyman Benson 1933-6-26 4488 Colusa Abbott mine. 549 Comment
  JEPS36621  Malacothrix clevelandii R. F. Hoover 1938-4-24 3212 Colusa Upper Sand Creek Comment
  UC768593  Malacothrix clevelandii R. F. Hoover 1938-4-24 3212 Colusa Upper Sand Creek Comment
  CHSC112252  Malacothrix floccifera Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18627 Colusa Inner North Coast Range. On the north side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  HSC47459  Malacothrix floccifera J. P. Smith 1978-4-22 9745 Colusa Bear Valley Rd., 1.2 mi. from its junction with Hwy. 20 412 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
  UCD66682  Malacothrix floccifera Craig D. Thomsen 2000-5-11 2309 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  CAS-BOT-BC347388  Malacothrix floccifera Volney Rattan 1884-1-1 s.n. Colusa Unspecified Comment
  UC35242  Malva parviflora J. Burtt Davy May, 1898 4279 Colusa near Willows Comment
  CHSC107935  Malvella leprosa B. Castro; Amy Lyons 2011-8-3 1902 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; approximately 0.7 mi southeast of Funks Reservoir and 350 ft northeast of Tehama-Colusa Canal. In grassland in patch under transmission lines ca 0.3 mi northwest of large +- alkaline marsh. 52 Comment
  POM62148  Malvella leprosa Roxana Stinchfield 1916-6-17 294 Colusa At Tule levee, College City. Comment
  UCD63127  Malvella leprosa Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4957 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Destinella Flat on the south side of Hwy 20, just east of the Lake County line, ca 3.4 rd miles west of junction with Hwy 16. 551 Comment
  UCR205148  Malvella leprosa George K. Helmkamp, E. A. Helmkamp 2008-10-14 14254 Colusa Sacramento Valley, along CA-20, 0.2 mile east of the Sutter County line 9 Comment
  CDA32964  Malvella leprosa Doug Barbe & Phyllis Hiatt 1979-5-2 Colusa Williams; waste ground by Shell station. 0 Comment
  CHSC116053  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
  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
  UCD66594  Marah watsonii Craig D. Thomsen 2000-4-28 2241 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UCD66689  Marah watsonii Craig D. Thomsen 2000-5-11 2319 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  CHSC118890  Marah watsonii Glenn Keator 1966-4-24 Colusa Junction of Rail Canyon Road and Sites-Lodoga Road. Comment
  CDA36216  Marrubium vulgare G. K. Helmkamp, E. A. Helmkamp 2009-5-2 14757 Colusa Inner North Coast Ranges; Along CA-16, 1.8 miles north of the Yolo County line. Comment
  UCD57553  Marrubium vulgare Andrew Pedersen; with Plant Biology 102 2007-4-29 3 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Meadow on the west side of State Route 16, ca. 2 road miles south of intersection with State Route 20. West side of Bear Creek, near confluence with Craig Creek. 304 Comment
  CDA34098  Matricaria discoidea P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  CHSC94450  Medicago lupulina Lowell Ahart 2006-8-9 13123 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UCD81219  Medicago polymorpha Ellen Dean; K. Mawdsley, B. Rice, G. Harrington, and J. Alderson 2009-5-6 5556 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. Ridges to the south of Destanella Flat. 483 Comment
  UCR206895  Medicago polymorpha George K. Helmkamp, E. A. Helmkamp 2009-3-11 14361 Colusa Sacramento Valley, along CA-20, 1.6 miles southwest of Colusa and just north of Colusa National Wildlife Refuge 15 Comment
  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
  POM276559  Medicago polymorpha var. brevispina Lyman D. Benson 1933-4-16 4336 Colusa 5 miles south of Arbuckle, Sacramento River Watershed, Sacramento Valley. 91 Comment
  RSA746964  Medicago sativa George K. Helmkamp, E. A. Helmkamp 2008-10-14 14253 Colusa along River Road (generally following the Sacramento River), 1.1 miles north of Colusa 18 Comment
  UCD107923  Medicago sativa Beecher Crampton 1963-8-5 6872 Colusa 3.5 miles south of Grimes. Comment
  UCD163713  Melica californica Craig Thomsen 1999-5-10 2025 Colusa Colusa County. At confluence of Sulphur Creek and Bear Creek. About 3 miles north of Hwy 20. Comment
  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
  CHSC111689  Melica californica David Isle; Doug Johnson 1988-5-11 2090 Colusa Mendocino Natl. Forest--North Coast Ranges Little Stony Creeik Watershed. N edge Little Stony Road (Goat Mtn Rd) 6.9 miles W of jct. Lodoga-Stonyford Rd (Co Rd 306). (Gray Pine Cmpgd=3.9 mi W of Co Rd 306 jct., 3 mi W=just E of Trout Ck Bridge over dL Stony Ck). 512 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
  JEPS81294  Melica harfordii L. R. Heckard and J. C. Hickman 1982-7-5 5908 Colusa just off creek below Summit Springs (s side of Snow Mt.); Snow Mt. 1500 Comment
  UCD57297  Melica torreyana Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3668 Colusa BLM Payne Ranch. Near junction of Craig and Thompson Canyons. West of Hwy. 16, ca. 2 road miles south of junction of Hwy. 20 and Hwy. 16. Upslope of unimproved road, above side branch of Craig Canyon, downslope of saddle separating Craig and Thompson Canyons. 370 Comment
  UCD57334  Melica torreyana Diane Hickson 2007-3-25 1 Colusa BLM Payne Ranch. Destinella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 560 Comment
  CHSC94747  Melilotus albus Lowell Ahart 2006-9-26 13349 Colusa Along the deep ditch, south side of the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell. 24 Comment
  RSA724950  Melilotus indicus L. Ahart 2006-8-9 13168 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
  UCD82136  Melilotus indicus Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5669 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 869 Comment
  UCD66910  Melilotus indicus Craig D. Thomsen 2008-4-27 s.n. Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Saddle southwest of Cowboy Camp on the west side of Bear Creek. 365 Comment
  UCD107985  Melilotus officinalis G. F. Hrusa 1999-5-16 15050 Colusa Little Stony Creek. 457 Comment
  UCD169976  Melilotus officinalis G. F. Hrusa 1999-5-16 15050 Colusa Little Stony Creek. 457 Comment
  CHSC94511  Mentha rotundifolia Lowell Ahart 2006-8-22 13207 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS104403  Mentha spicata Lowell Ahart 2003-10-23 10666 Colusa Along Squaw Creek, just south of East Park Reservoir, ca 1/8 mi nw of Sites Lodoga Rd, ca 1 mi n of Lodoga, ca 21 mi w of Maxwell. 368 Comment
  UCD170080  Mentzelia micrantha 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
  UCD117375  Mentzelia micrantha K. Esau 1934-5-6 s.n. Colusa above Williams Tahoe-Ukiah Highway. 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
  UCR261642  Micropus californicus Ann Howald 2003-4-23 2310 Colusa Inner North Coast Ranges, Indian Valley, East Park Reservoir, Catholic Point peninsula, west of Coppermine Road, c. 0.05 mi north of intersection with East Ruby King Road 428 Comment
  UCR261673  Micropus californicus Ann Howald 2003-3-26 2292 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
  CAS-BOT-BC348362  Micropus californicus var. californicus Roxana S. Ferris 1917-4-14 573 Colusa Foothills 7 mi west of Arbuckle, Arbuckle - Rumsey Road Comment
  CAS-BOT-BC348363  Micropus californicus var. californicus Roxana S. Ferris 1926-4-23 6431 Colusa Near summit of grade on Williams - Stonyford Rd Comment
  JEPS40618  Micropus californicus var. californicus W. L. Jepson 1932-5-8 16279 Colusa Lodoga Comment
  CHSC30421  Microseris douglasii J. D. Jokerst 1980-4-12 573 Colusa S of Hwy 20, 0.3 mi E of its jct with Hwy 16. Comment
  CAS-BOT-BC348829  Microseris douglasii subsp. douglasii Lewis S. Rose 1936-4-27 36185 A Colusa 15 mi. NW. of Rumsey 304 Comment
  JEPS94219  Microseris douglasii subsp. douglasii Vernon Oswald and Lowell Ahart 1998-5-7 8999 Colusa Bartlett Springs Road 2.1 mi w of Bear Valley Road (0.8 mi e of Sawtelle Valley and Grapevine Flat Roads); Bartlett Springs Road 524 Comment
  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
  CAS-BOT-BC348830  Microseris douglasii subsp. douglasii K. Curran 1889-4-1 s.n. Colusa Unspecified Comment
  UC92169  Microseris douglasii subsp. douglasii K. Brandegee 1889-1 Colusa Comment
  UC92188  Microseris douglasii subsp. douglasii Brandegee April 1889 Colusa 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
  CHSC70969  Microseris sylvatica Vernon Oswald; Lowell Ahart 1998-5-7 8991 Colusa Lodoga-Leesville Rd. 4.3 mi south of Cooks Spring Rd. Roadcut. 469 Comment
  CHSC81250  Microseris sylvatica L. P. Janeway; B. Castro 2001-4-26 7028 Colusa Vicinity of Grapevine Creek, Sites-Lodoga Road, and Eggman Canyon. 286 Comment
  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
  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
  CHSC94497  Mimetanthe pilosa Lowell Ahart 2006-8-9 13113 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS73486  Mimulus L. R. Heckard 1972-7-9 3098 Colusa se slope East Peak; Snow Mt. 2072 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
  HSC31628  Mimulus aurantiacus var. aurantiacus Glenn McGourty 1974-4-20 13 Colusa Roadcut of Hwy. 16, 17 mi. E of Esparto Comment
  UCD163654  Mimulus cardinalis Craig Thomsen 1998-6-10 1952 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  CDA41442  Mimulus douglasii S. E. Schoenig 1998-4-24 98 -9 Colusa Barrel Springs, 200 meters west of parking area off Walker Ridge Road, 1 mile south of intersection with Brim Road. Comment
  UCD82134  Mimulus floribundus Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5664 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 861 Comment
  CDA41790  Mimulus guttatus L. Ahart 2003-7-14 10383 Colusa 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. Comment
  JEPS121117  Mimulus guttatus Lowell Ahart 2013-5-1 18688 Colusa N of the wash and Hwy 20, just E of Lake County line, 12.2 air miles ENE of the town of Clear Lake, 17.1 air miles W of Williams. Comment
  SEINET13710597  Mimulus guttatus Lowell William Ahart, Lowell William Ahart 2003-1 10383 Colusa 21 Mi. SW of Williams, about 2 Mi. SW of Jct. Hwy 20 with Bear Valley Road (39 Deg 00'23.7"N, 122 Deg 23'59.5"W) 1708 Ft. 521 Comment
  UCR212343  Mimulus guttatus Craig D. Thomsen 2000-4-28 2187 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
  HSC96891  Mimulus layneae L. Ahart 2006-6-11 12664 Colusa E side of an off road trail (Trail 30), about 100 yards S of Fouts Rd., about 5 mi. W of Stonyford 613 Comment
  JEPS60202  Mimulus layneae L. R. Heckard 1969-5-29 2238 Colusa about 6 1/2 air mi se Stonyford (along Trough Spring Ridge road, 0.2 mi n of its junction with Crackerbox Ridge road) 1127 Comment
  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
  JEPS86637  Mimulus microphyllus L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-18 6685 Colusa along trail from Frog Pond to East Peak (sw flank of mtn.); Snow Mtn. 1900 Comment
  UCD122648  Mimulus microphyllus R. A. Christison 1960-4-17 28 Colusa on road to Wilbur Springs, 2 miles north of State Highway 20. Comment
  RSA794844  Mimulus pilosus D. Isle, Rhonda Isle 2010-7-21 1915 Colusa West shoreline of East Park Reservoir on bank just north of spillway; within 2 to 4 feet of water line. 365 Comment
  JEPS2941  Mimulus rattanii Volney Rattan Colusa trail above Fout's Spr. (n of San Francisco Bay); Coast Mts.; trail above Fout's Spring (?), Colusa Co. Comment
  NY90769  Mimulus rattanii V. Rattan 06 1882 s.n. Colusa Above Font's Spr. Coast Mts. North of San Francisco Bay. Comment
  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
  CHSC86967  Minuartia douglasii B. Castro 2003-5-15 1436 Colusa Vicinity of Logan Ridge, Sulphur Gap and Lurline Creek. Above dirt rd paralleling a S-trending canyon. 179 Comment
  RSA423545B  Minuartia douglasii J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9535 Colusa Bear Valley Road, 1.3 miles from its junction with State Route 20. 366 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
  POM256528  Minuartia douglasii Annetta Carter 1938-5-7 1377 Colusa Comanche Hills, 4 miles N of Rumsey, Inner North Coast Range. 259 Comment
  UC637082  Mollugo verticillata Edward Lee 1934-8-9 1010 Colusa 4 mi n of willows (Sacramento Valley); Sacramento Valley Comment
  UCR175120  Monardella Mark A. Elvin, Mark S. Brunell, D. Isle 2006-8-3 5021 Colusa North Inner Coast Ranges, Snow Mtn: Summit Spring Trail, 1.4 km west of Snow Mtn West summit and 800 m N of Cedar Camp 1989 Comment
Read comments
May 16 2007
  UCD67691  Monardella sheltonii D. Sanchez-Mata 1996-6-27 s.n. Colusa Williams, Blue Ridge, Bear Creek. 320 Comment
  UCD70238  Monardella sheltonii D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley, Bear Valley Road. Bear Valley Creek. 350 Comment
  CAS-BOT-BC220675  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
  UCD22648  Monardella villosa subsp. sheltonii Laura F. Galloway 1988-5-1 6 Colusa Leesville Road, 11.9 miles north of SR20. 487 Comment
  UCD81712  Monardella villosa subsp. villosa Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5718 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones Spring area on W side of road, ca. 6.5 road mi N of junction with Hwy 20. W side of road. 833 Comment
  UCD82537  Monardella villosa subsp. villosa Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5690 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 817 Comment
  UC629741  Monolopia major Ethel Crum 1938-5-8 2035 Colusa 4 mi s Leesville; Bear Valley 426 Comment
  SFV12204  Monolopia major J. M. Tucker 1968-5-4 4109 Colusa Bear Valley, middle of valley floor, 10 miles (by road) northwest of junction of Bear Valley Road and State Highway 20. 396 Comment
  CHSC89830  Muilla maritima B. Castro; S. Innecken 2001-3-20 1216 Colusa Vicinity of Maxwell, Golden Gate in Logan Ridge, Funks Reservoir, and the Glenn-Colusa canal. 39 Comment
  CAS-BOT-BC83280  Myosurus minimus Alice Eastwood 1922-4-24 11188 Colusa Road between Princeton and Norman. Colusa/Glenn county line. Comment
  UC1101349  Myosurus minimus subsp. apus Herbert L. Mason 1953-4-5 14510 a Colusa 3 mi e of Maxwell Comment
  UCD81889  Najas gracillima Ellen Dean; Bear Creek Ranch Grazing Committee 2009-6-19 5773 Colusa BLM Bear Creek (formerly Payne) Ranch. Lands to the SW of the junction of Hwys 16 and 20. Central part of ranch at large stock pond. 492 Comment
  UC1099999  Najas guadalupensis Malcolm A. Nobs, S. Galen Smith 1949-9-9 1891 Colusa 1 mi e of Williams Comment
  UC1100016  Najas guadalupensis Herbert L. Mason, Verne Grant 1946-8-15 13008 Colusa 2 mi w of Colusa (on Williams Highway by bridge) 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
  CAS-BOT-BC456163  Najas guadalupensis Herbert L. Mason; Verne Grant 1946-8-15 13008 Colusa Two miles west of Colusa on Williams highway by bridge Comment
  POM312984  Najas guadalupensis H. L. Mason, Verne Grant 1946-8-15 13008 Colusa 2 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
  POM163454  Nassella cernua Roxana S. Ferris 1926-4-23 6399 Colusa On rocky outcrop near Mountain House on Williams-Stonyford Road 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
  UCD57863  Nassella pulchra Gordon Harrington; Diana Hickson, Jack Alderson 2007-4-29 48 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. South terrace of Thompson Creek about 300 feet upstream of breached dam close to Road Kill Cafe. 395 Comment
  UCD81229  Navarretia Ellen Dean; K. Mawdsley, B. Rice, G. Harrington, and J. Alderson 2009-5-6 5566 Colusa Payne Ranch, lands to the SW of the jct. of Hwys. 16 and 20. Destanella Flat area on the S side of Hwy. 20. West side of Destinella Flat. 446 Comment
  UCSB6643  Navarretia G. Keator 1958-6-17 S.N. Colusa JUST W OF BARTLETT SPRINGS Comment
  CHSC112919  Navarretia heterandra B. Castro; Robin Carter, Amy Lyons 2010-5-13 1806 Colusa Vicinity of Golden Gate in Logan Ridge, Funks Reservoir, and the Tehama-Colusa canal in distrubed, grazed annual grassland. 119 Comment
  CHSC79544  Navarretia heterandra B. Castro; L. P. Janeway 2000-5-3 1124 Colusa Vicinity of Sites, Huffmaster Rd, and Grapevine Creek. 371 Comment
  JEPS117022  Navarretia heterandra David Gowen 2008-5-24 920 Colusa West side of Bear Valley Road, about 6.7 miles north of Hwy 20. Comment
  UC908879  Navarretia heterandra Herbert L. Mason 1946-5-30 12816 Colusa near Eppersons; Bear Valley Comment
  CAS-BOT-BC230316  Navarretia jepsonii Katharine Brandegee 1916-8-10 s.n. Colusa Bear Valley, near Eppersons Comment
  JEPS104075  Navarretia jepsonii Lowell Ahart 2003-7-14 10385 Colusa Field on the south side of Highway 20, ca 2 mi sw of the intersection of Highway 20 and Bear Valley Rd, ca 21 mi (by road) sw of Williams. 520 Comment
  SEINET13711098  Navarretia jepsonii Lowell William Ahart, Lowell William Ahart 2003-1 10385 Colusa 21 Road Mi. SW of Williams, 2 Mi. SW Jct. Hwy 20 and Bear Valley Road (39 Deg 00'23.7"N, 122 Deg 23'59.5"W) 1708 Ft. 521 Comment
  UCD57562  Navarretia jepsonii Stephanie Castle; with Plant Biology 102 2007-4-29 5 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Meadow on the west side of State Route 16, ca. 2 road miles south of intersection with State Route 20. West side of Bear Creek, adjacent to Craig Creek. 304 Comment
  UCD66870  Navarretia jepsonii Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5073 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. Just south of junction with trail that heads east to the headwaters of Thompson Creek. 634 Comment
  UCR197901  Navarretia jepsonii Calvin McMillan, Beecher Crampton (494F) 1949-9-25 s.n. Colusa 18 miles east of Bartlett Springs 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
  CHSC112918  Navarretia nigelliformis subsp. nigelliformis B. Castro; Robin Carter, Amy Lyons 2010-5-13 1807 Colusa Vicinity of Golden Gate in Logan Ridge, Road 69 and the Tehama-colusa canal, in disturbed, grazed annual grassland. 121 Comment
  CHSC79545  Navarretia nigelliformis subsp. nigelliformis B. Castro; L. P. Janeway 2000-5-1 1103 Colusa Vicinity of Sites, hills S of the Sites-Lodoga Rd, and Grapevine Creek. 204 Comment
  JEPS95775  Navarretia nigelliformis subsp. nigelliformis J. Greenhouse with J. C. Game 1999-5-30 Colusa on W side of Bear Valley Rd. about 6 1/2 mi from CA Rte. 20 Bear Valley 390 Comment
  JEPS116997  Navarretia nigelliformis subsp. radians David Gowen 2008-5-24 923 Colusa West of Sites, heading up the hill on road to Ladoga, opposite driveway to #4826. Comment
  UCD82118  Navarretia pubescens Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5646 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 839 Comment
  JEPS15538  Nemacladus capillaris G. Thomas Robbins with L. R. Heckard 1956-7-25 3696 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); Snow Mt. 1920 Comment
  UCD81730  Nemacladus capillaris Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5732 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones Spring area on W side of road, ca. 6.5 road mi N of junction with Hwy 20. W side of road. 864 Comment
  UCR78370  Nemacladus capillaris Barbara Ertter 1989-7-1 8599 Colusa road to Goat Mtn Lookout, 2.2 mi. south of Route M-10 (Bear Creek - Fouts Spring Road) at head of S Fork of Stony Creek, c. 12 air mi. WSW of Stonyford 1500 Comment
  RSA537450  Nemacladus capillaris Barbara Ertter 1989-7-1 8599 Colusa Road to Goat Mt Lookout 2.2 miles S of Rt M-10 (Bear Creek-Fouts Spring Rd) at head of S Fk Stony Creek, ca 12 airmiles WSW of Stonyford. 1500 Comment
  SEINET10464797  Nemacladus capillaris Rattan 1884-1 RATTAN s.n. Colusa Above Stony Creek Comment
  CHSC79485  Nemacladus montanus B. Castro; L. P. Janeway 2000-5-4 1138 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 249 Comment
  CHSC77935  Nemophila heterophylla Beth Hendrickson; Heidi West 1999-3-23 Colusa Vicinity of Antelope Valley, Funks Creek, and Golden Gate. 137 Comment
  CHSC77936  Nemophila heterophylla Beth Hendrickson; Jean Witzman 1999-4-21 Colusa Vicinity of Antelope Valley and Sites. 137 Comment
  RSA758531  Nemophila heterophylla George K. Helmkamp, E. A. Helmkamp 2009-3-11 14372 Colusa along CA-20, 14.3 miles southwest of Williams 375 Comment
  UC107269  Nemophila heterophylla K. Brandegee April 1889 Colusa Stites Comment
  UC598446  Nemophila heterophylla Milo S. Baker April, 1938 Colusa Williams Highway near Lake County Line; near Lake County Line 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
  JEPS2989  Nemophila menziesii Alice King May, 1908 Colusa College City Comment
  HSC87763  Nemophila menziesii Stephen Westergaard 1967-4-29 12 Colusa Bear Valley, 5 mi. N of Hwy. 20 91 Comment
  JEPS94183  Nemophila menziesii var. menziesii Vernon Oswald and Lowell Ahart 1998-4-21 8949 Colusa Rd. 401 1.8 mi. n. Grapevine Pass (on the Sites-Lodoga Rd.) 472 Comment
  HSC66134  Nemophila pedunculata C. Macdonald, P. Powers, C. Raley, J. Spitler, D. Stamp 1980-4-19 42 Colusa On Bartlett Springs Rd. at stream crossing Comment
  UCD63012  Nemophila pedunculata Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4665 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
  CHSC112643  Nicotiana acuminata var. multiflora Lowell Ahart 2013-10-1 19084 Colusa Inner North Coast Range. Strand of East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  JEPS87760  Nicotiana glauca Vernon H. Oswald and Lowell Ahart 1994-3-23 6024 Colusa 1.8 mi w Stonyford-Lodoga Rd. (Goat Mtn Rd, s of Stonyford, between the road and Little Stony Creek) 487 Comment
  SEINET6174905  Nicotiana glauca R. R. Halse 2007-3-25 7123 Colusa Along State Hwy. 20 ca 7.8 miles NE of junction with State Hwy. 16 at base of Salt Canyon, 100 Comment
  CHSC113037  Nicotiana quadrivalvis Lowell Ahart 2013-10-1 19085 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
  CHSC71441  Orobanche californica subsp. jepsonii Vernon H. Oswald; Lowell Ahart 1998-7-15 9274 Colusa Bartlett Springs Rd. 2.1 mi west of Bear Valley Rd., 0.8 mi east of Sawtelle Valley and Grapevine Flat roads. Along the edge of a meadow. 524 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
  UCD123224  Orobanche uniflora Betty Hess 1973-4-15 s.n. Colusa 0.5 mile north of State Highway 20 on Bartlett Springs Road. Comment
  UC71779  Orobanche vallicola H. P. Chandler 1905-10-1 Colusa Princeton Comment
  POM231093  Orthocarpus lithospermoides var. bicolor Jens Clausen 1935-5-20 1018 Colusa Ca. 27 mi W of Williams after having passed the Wilbur Springs road. Along Bear Creek. Comment
  SEINET12319550  Orthocarpus purpurascens Unknown 1980-1 19 Colusa ca 0.3 mi W of jct of Hwy 20 & 16, S side of Bear Cr., ca 18 mi SW of Williams 322 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
  JEPS95998  Packera clevelandii Vernon H. Oswald and L. Ahart 1999-6-22 9783 Colusa 1.5 mi west of Stonyford-Lodoga Road on County Road 42 paralleling Little Stony Creek: T17N R6W Sect. 29, ca. 1400 ft, 1180 ft, chaparral, serpentine substrate 426 Comment
  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
  UCD64040  Packera clevelandii Craig D. Thomsen 2000-6-23 2425 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, Colusa Co. milepost 2.63. 304 Comment
  UCD163327  Packera eurycephala Craig D. Thomsen 2009-5-3 2792 Colusa Walker Ridge. Vicinity of Walker Ridge Rd., 0.25 miles north of Hwy 20. Comment
  UCD163853  Packera eurycephala Craig D. Thomsen 2000-5-30 2274 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  CHSC70785  Packera eurycephala var. eurycephala B. Castro; D. Isle, L. Hanson, L. Janeway 1995-4-28 565 A Colusa Stonyford area, along the west bank of Salt Creek, beginning ca 20 yds N of Dennis Drive, extending into fenced field to the W and into property to the N of field. 371 Comment
  UC91676  Packera eurycephala var. eurycephala Brandegee May 1887 Colusa Epperson's Comment
  SFV12205  Packera eurycephala var. eurycephala J. M. Tucker 1968-5-4 4108 Colusa Bear Valley, open valley floor, 8.6 miles (by road) northwest of junction of Bear Valley Road and State Highway 20. 396 Comment
  CAS-BOT-BC316930  Packera greenei Ella D. Cantelow 1957-5-31 s.n. Colusa 4 mi. west of Leesville on grade above Bear Valley Comment
  RSA724818  Panicum capillare L. Ahart 2006-8-22 13222 Colusa south side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford. 349 Comment
  CAS-BOT-BC413468  Parietaria pensylvanica Roxana Stinchfield 1916-7-8 378 Colusa Sycamore Slough. Stinchfield ranch 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
  UC1037264  Paspalum boscianum E. Wilson 1934-8-9 54 Colusa Biggs Comment
  CAS-BOT-BC259722  Paspalum distichum Roxana Stinchfield 1916-7-11 454 Colusa Colusa - Williams Road at the trough 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
  UCD88914  Paspalum distichum K. Esau; D. Hartmann 1941-7-17 s.n. Colusa near Williams. 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
  JEPS87668  Pectocarya pusilla Vernon H. Oswald and Lowell Ahart 1994-4-6 6071 Colusa s. Stonyford (Goat Mtn. Road 0.8 mi s. of Sullivan Creek Bridge, sw of Digger Pine Flat) 487 Comment
  UC766994  Pectocarya pusilla R. F. Hoover 1938-4-23 3209 Colusa Upper Sand Creek Comment
  CHSC84651  Pedicularis densiflora Matt Quinn 2001-3-31 33 Colusa Found on Walker Ridge, north of Highway 20 between Bear Valley and Clear Lake, at the top of the road leaving Bear Valley. On ridgetop. 664 Comment
  RSA0060516  Pedicularis densiflora Richard R. Halse 2014-3-25 9035 Colusa Along the Bear Valley Road ca. 1.8 miles west northwest of its junction with State Hwy. 20. 378 Comment
  JEPS86608  Pellaea L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-19 6711 Colusa 0.5 mi ne Summit Springs; sw flank Snow Mt 1650 Comment
  UCD80837  Pellaea andromedifolia Ellen Dean; G. Harrington, J. Alderson, M. Bibbo, B. Rice 2009-3-25 5294 Colusa BLM Bear Creek (Payne) Ranch, lands to the SW of the jct of Hwys 16 and 20. Ridge between Brophy Canyon and the canyon to its north. Highest point just above northern canyon at its terminus in a stock pond. 512 Comment
  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
  SEINET3873302  Pellaea mucronata subsp. mucronata Stephen Plant 1978-4-22 212 Colusa Wilber Springs Quad. Bear Valley Road, 1.5 miles from its junction with State Route 20.; 0 411 Comment
  HSC67100  Penstemon heterophyllus subsp. purdyi S. Harris, B. Ferguson, M. Smith, M. Moble 1980-4-19 Colusa Leesville Rd., road from Leesville to Williams, 3.8 mi. E of Leesville Comment
  UCR206380  Penstemon heterophyllus subsp. purdyi George K. Helmkamp, E. A. Helmkamp 2009-5-20 14756 Colusa Inner North Coast Ranges, along CA-16, 1.8 miles north of the Yolo County line 271 Comment
  RSA407923  Penstemon heterophyllus subsp. purdyi Jens Clausen 1935-5-20 1009 Colusa Ca 12 mi SW of Williams on Barlett Springs Road. Comment
  UCD67126  Penstemon heterophyllus var. azureus Ellen Dean; Davis Botanical Society 2008-5-31 5056 Colusa west of I-5 at Maxwell, vicinity of Fouts Springs, west of Stoneyford, Grindstone Ranger District Mill Creek campground parking area on S side of Fouts Springs Road. 507 Comment
  CHSC105197  Penstemon heterophyllus var. heterophyllus B. Castro; L. P. Janeway 1999-7-5 1011 Colusa Ca 11 air mi SSW of Stonyford, 5 mi NW of Indian Valley Reservoir, just N of Colusa/Lake Co line, along small rd to Bear Wallow Spring. In serpentine substrate on NNW-facing slope W of Lovelady Ridge rd ca 0.5 mi N of its jcn with USFS Rd 16N06, 0.6 mi NE of Pacific Point. 1057 Comment
  JEPS7560  Penstemon heterophyllus var. heterophyllus W. L. Jepson 1920-3-23 8963 Colusa Mountainside above Venado (sw Colusa Co.); Mountainside above Venado 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
  UCD82488  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
  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
  UC125238  Penstemon purpusii Katharine Brandegee 1892-8-24 Colusa Snow Mountain near Monument; Snow Mountain near the Monument Comment
  CDA8447  Pentachaeta exilis N. van Kleeck, Willa May Lowary 1970-4-18 Colusa Bear Valley, just south of Ladoga. 0 Comment
  HSC66133  Pentagramma triangularis Teri Bartowski, Shane Feusier, Ruth Takaki, Carol Zimmerer 1980-4-19 37 Colusa Bartlett Springs Rd. at stream crossing. Comment
  CHSC42651  Perideridia kelloggii Vernon Oswald 1986-6-30 2175 Colusa Letts Lake Rd. (17N02) 0.6 mi se of M10. 1219 Comment
  JEPS75733  Perideridia kelloggii L. R. Heckard 1974-9-9 3875 Colusa Just northeasts of rocky promontory southeast of Foutch Camp; Snow Mts. Comment
  SEINET7929202  Perideridia kelloggii K. Morris, Conrad; Dunn 1973-6-6 379 Colusa On Hwy 20, 0.3 mi E of Lake County Line.; 0 Comment
  UC1389985  Perideridia kelloggii Freed W. Hoffman 1947-6-19 1659 Colusa Cooks Springs North Coast Ranges (w Colusa Co.) Comment
  UC875337  Perideridia kelloggii A. A. Heller 1916-6-6 12361 Colusa grade about 3 mi w Leesville; Coast Range Comment
  UCD127855  Perideridia kelloggii K. Esau; D. Hartmann 1941-7-17 s.n. Colusa Between Williams and Clear Lake, on U.S. #20. Comment
  JEPS73489  Perideridia oregana L. R. Heckard 1972-7-9 3101 Colusa East Peak Snow Mt. (scree slope on se slope) 2011 Comment
  UCD99462  Persicaria lapathifolia C. F. Dunshee 1922-1 s.n. Colusa Rice fields. Comment
  CHSC94698  Persicaria maculosa Lowell Ahart 2006-9-26 13354 Colusa Along the deep ditch, south side of the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell. 24 Comment
  HSC47736  Petrorhagia dubia Thomas W. Nelson, Jane P. Nelson 1978-4-29 3942 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  JEPS2272  Phacelia ciliata var. ciliata Ruth Johnson 1915-4-6 Colusa College City 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
  JEPS73508  Phacelia egena L. R. Heckard 1972-7-10 3125 Colusa overlooking and 3 mi nw Fouts Springs (near promontory on se corner of mt.); Snow Mt. 1828 Comment
  UC901823  Phacelia egena L. Constance, R. Bacigalupi, C. R. Bell, and A. H. Holmgren 1950-4-26 3320 Colusa road cut 1 mi se Sites; Stone Corral Creek 76 Comment
  UC901824  Phacelia egena L. Constance, R. Bacigalupi, C. R. Bell, and A. H. Holmgren 1950-4-26 3320 Colusa road cut 1 mi se Sites; Stone Corral Creek 76 Comment
  HSC45747  Phacelia heterophylla Stephen Plant 1978-4-22 205 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  JEPS80874  Phacelia heterophylla subsp. virgata L. R. Heckard and J. C. Hickman 1980-7-3 5373 A Colusa near Summit Springs (sw slope); Snow Mt. 1554 Comment
  SEINET7096745  Phacelia heterophylla subsp. virgata A. G. Vestal 1955-4-5 s.n. Colusa Steep south of facing bank ca. 1/3 mile into Colusa National Wildlife Refuge on Route 20.NAD27, 39? deg. 09' 09ao, -122?_ 11ao (converted to WGS84 decimal degrees) UTM Zone 10, 570301mE, 4333799mN. Comment
  HSC47567  Phacelia imbricata Sheila Logan 1978-4-22 67 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  UCD56659  Phacelia imbricata Sam Bledsoe 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. 566 Comment
  RSA799179  Phacelia imbricata subsp. imbricata George K. Helmkamp, E. A. Helmkamp 2011-4-1 17132 Colusa Eastern foothills North Coast Ranges: Antelope Valley, along Maxwell-Sites Road, 0.4 mi southeast of Sites. 93 Comment
  CAS-BOT-BC134039  Phacelia tanacetifolia Roxana S. Ferris 1926-4-23 6407 Colusa on grade beyond the Mountain House of the Williams-Stonyford Road Comment
  POM163459  Phacelia tanacetifolia Roxana S. Ferris 1926-4-23 6407 Colusa Grade beyond the Mountain House on the Williams-Stonyford Road. Comment
  HSC45512  Phacelia tanacetifolia M. Alcasas 1978-4-22 48 Colusa Bear Valley Rd., 2.3 mi. from Hwy. 20 419 Comment
  POM289798  Phacelia tanacetifolia Lyman Benson 1935-3-27 6338 Colusa 2 mi W of Williams. Inner N Coast mtn range, Sacramento River watershed. 122 Comment
  CAS-BOT-BC258849  Phalaris aquatica Alice Eastwood; John Thomas Howell 1940-6-10 7875 Colusa Williams Comment
  UCD66920  Phalaris aquatica Craig D. Thomsen; G. Harrington 2008-7-6 2779 Colusa BLM Payne Ranch. Lands to the SW of the jct of Hwys 20 and 16. Western edge of ranch on ridge above Cache Creek canyon. Along ridge trail. 510 Comment
  UCR227636  Phalaris aquatica Craig D. Thomsen, Gordon Harrington 2008-7-6 2779 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 20 and 16. Western edge of ranch on ridge above Cache Creek Canyon, along ridge trail 511 Comment
  CHSC57170  Phlox gracilis R. W. McNulty 1983-4-9 1 Colusa Ca. 0.3 mi w of jct. of Hwys 20 and 16, s side of Bear Creek, ca. 18 mi se of Williams. 321 Comment
  JEPS86610  Phlox gracilis L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-19 6710 Colusa 0.5 mi ne Summit Springs (sw flank of Snow Mountain, Colusa-Lake Co line); Snow Mountain 1640 Comment
  CHSC90854  Phoradendron densum D. Isle 1996-11-26 188 Colusa Mendocino National Forest--North Coast Ranges. Bear Creek Watershed. 1.1 mi. so. of jct. Covelady 4x4 Rd. with 24N02, near Kanaka Glade, Pacific Ridge. 1018 Comment
  CAS-BOT-BC135299  Phoradendron serotinum subsp. macrophyllum Roxana S. Ferris 1917-4-15 623 Colusa Sycamore. Sycamore Slough Comment
  UC1124395  Phyla caespitosa H. S. Yates 1936-8-14 6134 Colusa 3 mi S of Colusa 15 Comment
  JEPS24655  Physalis lancifolia J. H. Thomas 1960-8-30 8866 Colusa about 5 mi nw of College City (along road to Sycamore) Comment
  RSA140862  Physalis lancifolia John H. Thomas 1960-8-30 8866 Colusa About 5 miles northwest of College City along road to Sycamore. Comment
  UC985936  Physalis lancifolia Herbert L. Mason and Verne Grant 1946-8-7 12979 Colusa 8 mi n Colusa; Butte Sink Comment
  CDA5824  Physalis lancifolia Cowley Jul 1931 Colusa West of Colusa. 0 Comment
  CHSC105195  Pickeringia montana var. montana B. Castro; L. P. Janeway 1999-7-5 1017 Colusa Ca 11 air mi SSW of Stonyford, 5 mi NW of Indian Valley Reservoir, just N of Colusa/Lake Co line, near Bear Wallow Spring. In serpentine substrate on gentle N-facing slope along N edge of USFS Rd 16N06, near top of Pacific Ridge. 1127 Comment
  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
  UCR225461  Piptatherum miliaceum Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5115 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20. Southwestern edge of ranch above Cache Creek Canyon along ridge trail 548 Comment
  CHSC89829  Plagiobothrys austiniae B. Castro; S. Innecken 2001-3-20 1215 Colusa Vicinity of Maxwell, Golden Gate in Logan Ridge, Funks Reservoir, and the Glenn-Colusa canal. 39 Comment
  CHSC81227  Plagiobothrys bracteatus Caroline Warren; Joyce Lacey-Rickert 1998-5-8 Colusa Vicinity of Sites and Antelope Creek. 91 Comment
  RSA10709  Plagiobothrys bracteatus C. B. Wolf 1928-5-8 2122 Colusa Sacramento Valley. 3 mi. S of Arbuckle Comment
  CAS-BOT-BC230037  Plagiobothrys canescens Stephanie Castle; Plant Biology 102 2007-4-29 1 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Meadow on the west side of State Route 16, ca. 2 road miles south of intersection with State Route 20. West side of Bear Creek, north of Craig Creek 304 Comment
  CHSC77920  Plagiobothrys canescens Beth Hendrickson; Jean Witzman 1999-4-21 Colusa Vicinity of Antelope Valley and Sites. 137 Comment
  UC78083  Plagiobothrys fulvus var. campestris Katharine Brandegee April, 1889 Colusa Colusa Junction 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
  CHSC79100  Plagiobothrys greenei B. Castro; C. Warren 2000-4-3 1047 Colusa Vicinity of Antelope Valley, Sites-Lodoga Rd, and Grapevine Ck. 170 Comment
  UCD56900  Plagiobothrys greenei Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3503 Colusa BLM Payne Ranch. On the west side of Hwy. 16. Ca. 2 road miles south of junction of Hwy. 16 and Hwy. 20. 304 Comment
  UCD66939  Plagiobothrys greenei Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5088 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western side of ranch along trail that follows the border of Lake and Colusa counties. Dunsfield Flat stock pond. 628 Comment
  CHSC29722  Plagiobothrys humistratus K. R. Stern 1980-4-1 6621 Colusa Vernal pool, south central border area of Colusa National Wildlife Refuge. 45 Comment
  UC78046  Plagiobothrys infectivus Katharine Brandegee Apr 1889 Colusa Leesville Comment
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  CHSC31261  Plagiobothrys leptocladus R. A. Schlising; K. R. Stern 1980-5-5 3581 Colusa SW of Colusa, at Colusa National Wildlife Refuge; in southwest cornerof refuge, about 0.5 mi north of Ware Road, at immediate roadside in area of dried 'salt flats'. Comment
  SD180603  Plagiobothrys leptocladus Carol Witham, Jennifer Buck 2001-4-30 151 A Colusa 2.0 miles south of the town of Colusa along Highway 20, east of Highway 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001. Comment
  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
  HSC64006  Plagiobothrys nothofulvus J. P. Smith, Thomas W. Nelson 1976-4-14 8585 Colusa Mendocino National Forest, confluence of Stony Creek and N Fork of Stony Creek. 427 Comment
  SEINET3152906  Plagiobothrys nothofulvus M. A. King 1905-4-7 D Colusa College city Comment
  UCD120933  Plagiobothrys nothofulvus E. Witharm 1998-4-17 5 Colusa Bear Vly., Leesville-Lodoga Rd., 2 road miles NE from Bear Vly Rd. -- Leesville-Lodoga Rd. junction. Comment
  CHSC89895  Plagiobothrys shastensis B. Castro; L. P. Janeway 2001-4-19 1233 Colusa Vicinity of Grapevine Creek, Sites-Lodoga Road, and Scotties Spring. At upper edge of corridor along perennial N-S-trending creek. 292 Comment
  JEPS124210  Plagiobothrys stipitatus Lowell Ahart 2015-4-10 20006 Colusa About 1/2 mile east of Leesville, about 12 miles (air) northwest of Williams. Comment
  CDA11419  Plagiobothrys stipitatus var. micranthus G. F. Hrusa, K. van Katwyk 1995-4-22 12140 Colusa Inner North Coast Ranges; N side of Leesville Rd. approx. 4 m. NW of Hwy. 20. Comment
  CHSC115340  Plagiobothrys stipitatus var. micranthus Lowell Ahart 2015-4-10 20006 Colusa Large size plant, on damp dark soil, along the south edge of Leesville Road. 445 Comment
  CHSC52671  Plagiobothrys stipitatus var. micranthus James Jokerst 1986-5-6 2304 Colusa Near Lurline Creek. Vernal pool. 41 Comment
  UCD163319  Plagiobothrys stipitatus var. micranthus Craig D. Thomsen 1997-4-20 1914 Colusa Bear Valley. About 6 miles north of Hwy 20. Comment
  UCD66869  Plagiobothrys stipitatus var. micranthus Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5072 Colusa BLM Payne Ranch. Lands to the southwest of the intersection of Hwy 16 and Hwy 20. Northwest corner of ranch. Along ridge trail on the border of Lake and Colusa counties. East side of trail around stock pond. 609 Comment
  UCD66940  Plagiobothrys stipitatus var. micranthus Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5089 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western side of ranch along trail that follows the border of Lake and Colusa counties. Dunsfield Flat stock pond. 628 Comment
  CHSC86873  Plagiobothrys stipitatus var. stipitatus B. Castro; Beth Hendrickson 2003-4-7 1416 Colusa Vicinity of Sites, Antelope Valley, and Salt Lake. 94 Comment
  JEPS61053  Plagiobothrys stipitatus var. stipitatus Alice King May 1906 Colusa College City Comment
  UCR261652  Plagiobothrys tenellus Ann Howald 2003-4-24 2320 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
  CHSC86843  Plantago coronopus 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
  UCD18844  Plantago coronopus Vernal Pool Team 2001; Carol Witham and Jennifer Buck 2001-4-30 152 Colusa 2 mi. south of the town of Colusa along Hwy 20, east of Hwy 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001, UTMs: 10S0587286; 4330302. Comment
  CHSC110844  Plantago coronopus Justin Isle; David Isle 1989-4-28 Colusa Sacramento River Watershed,S side of Maxwell Rd, 2 mi SE of Sites, just SE of Sites Quarry Squarry face. In dry area N of Stone Corral Ck. 106 Comment
  CHSC57194  Plantago erecta Lisa J. Newsum 1984-3-31 1 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. 143 Comment
  CHSC57195  Plantago erecta John Griffish 1980-4-16 6 Colusa Ca. 7 mi s of Stonyford. 401 Comment
  CHSC81283  Plantago erecta J. Trizzino 2001-3-31 18 Colusa Bear Valley Meadow along east side of Bear Balley Road. 396 Comment
  CHSC86027  Plantago erecta Jenny Marr; H. West, J. Lacey, C. Warren, N. Wight 1998-4-14 Colusa Vicinity of Grapevine Creek, Antelope Valley, and Sites-Lodoga Road. Pasture. 121 Comment
  POM61338  Plantago erecta Roxana S. Ferris 1917-4-12 496 Colusa 4 miles east of Williams. Comment
  RSA424754  Plantago erecta Aaron Liston, M. Blumler 1987-4-26 668 -3 Colusa East Park Reservoir, 3.2 miles E of Stonyford Comment
  UCD124494  Plantago erecta J. M. Tucker 1960-4-3 3582 Colusa north side of State Highway 20, ca. 100 yards east of Lake-Colusa county line. Comment
  UCD57337  Plantago erecta Diane Hickson 2007-3-25 3 Colusa BLM Payne Ranch. Destanella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 560 Comment
  HSC45522  Plantago erecta M. Alcasas 1978-4-23 61 Colusa Bear Valley Rd., 2 mi. from Hwy. 20 442 Comment
  SD147976  Plantago erecta L. Coats 1983-4-24 6 Colusa In the hills at the south end of Bear Valley, along Bear Valley Road, 6.3 miles south of Bartlett Springs Road. 487 Comment
  UCD124495  Plantago erecta J. M. Tucker 1960-4-3 3583 Colusa 1/4 mile west of road, 7.5 miles above State Highway 20, Bear Valley (Wilbur Springs) Road. Comment
  POM142384  Platanus racemosa Roxana Stinchfield 1916-7-8 395 Colusa Stinchfield Ranch, along Sycamore Slough Comment
  CHSC79537  Platystemon californicus Simona Altman 1999-4-3 53 Colusa Bear Valley, Bear Valley Rd. 396 Comment
  CHSC81294  Platystemon californicus J. Trizzino 2001-3-31 19 Colusa Bear Valley Meadow along east side of Bear Valley Road near creek. 396 Comment
  UC125224  Platystemon californicus Katharine Brandegee Apr 1889 Colusa Colusa Junction 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
  UCD56922  Platystemon californicus Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3525 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Near headwaters of Craig Canyon. 359 Comment
  UCD96031  Platystemon californicus Beecher Crampton 1975-4-21 9170 Colusa 3.5 miles northwest of Lodoga (by road.) Comment
  CDA34082  Platystemon californicus P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  SEINET5718795 Image available Platystemon californicus Lois Goodman 1969-1 1 Colusa 9.5 miles north of State Hwy 20. Comment
  UCD14423  Platystemon californicus R. M. Rhode 1984-4-21 s.n. Colusa Colusa Co.; Bear Valley, 10 miles north of Intersection of Highways 16 and 20; 426 Comment
  UCD22719  Platystemon californicus Nancy Vucinich 1978-4-8 6 Colusa Bear Valley. 10.3 miles(by road) north of the junction of Hwys 16 and 20. 396 Comment
  UCD68862  Platystemon californicus G. Robinson 1984-4-21 11 Colusa Bear Valley, California, 30 m. West of Wilbur Springs Road, 3.2 miles North of Highway 20. In valley grasslands - pasture forbs plant association, dominated by composites, on hard, black clay soil, in full sunlight, common in area. Solitary, upright plants. Flowers, yellow-white, 'cream cup. 390 Comment
  UCSB63724  Platystemon californicus Devanna, Martin 1987-4-4 Colusa Ca. 0.3 mi w of jct Hwys 20 and 16; S side of Bear Creek; ca. 18 mi sw of Williams; Wilbur Springs Quadrangle; S central border of Sect. 36. T14N, R5W 321 Comment
  POM158154  Platystemon californicus var. californicus Lyman Benson 1935-3-27 6335 Colusa 2 mi W of Williams. Inner N Coast mtn range, Sacramento River watershed. 122 Comment
  POM19059  Platystemon californicus var. californicus Lyman Benson 1935-3-27 6334 Colusa 2 mi W of Williams. Inner N Coast mtn range, Sacramento River watershed. 122 Comment
  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
  CDA34081  Plectritis ciliosa P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  CHSC62948  Plectritis ciliosa subsp. ciliosa Vernon H. Oswald; Lowell Ahart 1994-4-6 6066 Colusa Goat Mtn. Rd. at Sullivan Creek, 1.2 mi SW of Digger Pine Flat, S of Stonyford. 469 Comment
  JEPS87663  Plectritis ciliosa subsp. ciliosa Vernon H. Oswald and Lowell Ahart 1994-4-6 6066 Colusa 1.2 mi sw of Digger Pine Flat (s of Stonyford, Goat Mountain Road at Sullivan Creek); Sullivan Creek, Goat Mountain Road 469 Comment
  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
  JEPS94195  Plectritis macrocera Vernon Oswald and Lowell Ahart 1998-5-7 9007 Colusa Bartlett Springs Rd. 2.1 mi. w. of Bear Valley Rd., 0.8 mi. e. of Sawtelle Valley & Grapevine Flat rds. 524 Comment
  JEPS95488  Plectritis macrocera Vernon H. Oswald and L. Ahart 1994-4-6 6067 A Colusa T17N R7W SE1/4 SW1/4 Sec. 36, 1540 ft, Chaparral. Goat Mtn. Rd. at Sullivan Creek, 1.2 mi SW of Digger Pine Flat, S of Stonyford 469 Comment
  UC1053421  Plectritis macrocera Rimo Bacigalupi, Arthur Holmgren 1950-4-26 3171 Colusa 7.7 mi w of Sites (Grapevine Grade to Lodoga); Grapevine Grade Comment
  UC999826  Plectritis macrocera S. C. Dyal, A. Carter, E. Crum 1938-5-7 693 Colusa near Williams 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
  UCD57103  Plectritis macrocera Gordon Harrington; Diana Hickson 2007-4-7 0016 Colusa BLM Payne Ranch, SW of intersection of Hwy 16 and Hwy 20, 3/4 mile WNW of Roadkill Cafe. 470 Comment
  SEINET3287538 Image available Poa annua George K. Helmkamp, E. A. Helmkamp 2009-1-31 14322 Colusa Sacramento Valley; Jameson Road 1.3 miles north of its junction with Lurline Road and south of Harbison Road, generally west of the city of Colusa. 16 Comment
  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
  UC1108833  Poa annua Herbert L. Mason 1947-3-29 13152 Colusa ca 3 mi ne Colusa (Butte Sink, along Butte Creek) Comment
  CDA2384  Poa bulbosa M. H. Handley 1963-5-1 Colusa Sites. 0 Comment
  CHSC57562  Poa bulbosa Steven Triano 1987-4-4 16 Colusa Salt Canyon, n side of Salt Creek, ca. 40 ft s of Hwy 20, 11 mi wsw of Williams. 143 Comment
  UCD64418  Poa bulbosa Craig D. Thomsen 2000-3-11 2166 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCD82624  Poa pratensis Craig Thomsen; G. Harrington 2009-5-12 2894 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  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
  JEPS80447  Poa secunda subsp. secunda L. R. Heckard with J. Hickman 1980-9-15 5438 Colusa n of road at Summit Springs; Snow Mt 1569 Comment
  UCD90886  Poa secunda subsp. secunda John R. Davey 1967-12-2 90 Colusa Border, ca. 5-6 miles WSW of Leesville, Bartlett Springs Road N of Baldy Mountain. 609 Comment
  UCR281725  Polanisia dodecandra subsp. trachysperma David Isle 2014-7-27 2137 Colusa Northern California Foothills, north side of Maxwell Road, c. 2 miles west of Sites and 5.8 miles east of summit of Maxwell Grade [Sites-Lodoga Road] 149 Comment
  UCD77929  Polanisia dodecandra subsp. trachysperma Robert E. Preston 1999-9-24 1244 Colusa Along Highway 162, 2 miles W of Tehama Colusa Canal. 91 Comment
  CDA22742  Polygonum amphibium var. emersum P. Steinbaugh, Goodwin 1932-10-1 Colusa Near Grand Island. 0 Comment
  POM165592  Polygonum aviculare Roxana Stinchfield 1916-7-11 457 Colusa Sycamore Comment
  CAS-BOT-BC413965  Polygonum aviculare subsp. aviculare Roxana Stinchfield 1916-6-17 292 Colusa Near College City Comment
  JEPS81372  Polygonum davisiae L. R. Heckard and J. C. Hickman 1982-7-8 5983 Colusa just n summit marker (West Peak and Cirque from West Peak); Snow Mt. 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
  JEPS75752  Polygonum parryi L. R. Heckard and R. Bacigalupi 1976-9-6 4433 Colusa just e Fouts Camp; Snow Mt. 1859 Comment
  JEPS80165  Polygonum polygaloides subsp. kelloggii L. R. Heckard and J. Hickman 1980-7-2 5316 Colusa ne Snow Mtn. peaks (ca 10 mi w of Stonyford); Upper Milk Ranch Meadow 1920 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
  UCD72472  Polypogon maritimus Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3806 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. Bank of Bear Creek near north end of bridge, west side of creek. 259 Comment
  UCR228273  Polypogon maritimus Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5065 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20. Northwest corner of ranch, along ridge trail on the border of Lake and Colusa counties. East side of trail around stock pond 610 Comment
  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
  UCD61440  Polypogon monspeliensis Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3885 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1/4 mile NW of parking lot in hills to the west of Bear Creek. 356 Comment
  UCD91239  Polypogon monspeliensis A. A. Beetle 1942-5-21 3269 Colusa 12 miles north of Williams. Comment
  UCD91294  Polypogon monspeliensis Beecher Crampton 1958-5-19 4809 Colusa West of Lodoga. Comment
  SBBG119883  Polypogon viridis L. Ahart 2006-8-9 13159 Colusa N side and under bridge across Stony Crk, just N of Stonyford 347 Comment
  JEPS127192  Polystichum imbricans subsp. curtum Lowell Ahart, John Dittes, Josephine Guardino 2016-2-14 20721 Colusa About 1/2 mile north of Letts Lake, about 1/2 mile south of the large campground, about 13 miles (air) southwest of Stonyford. Comment
  JEPS75871  Polystichum imbricans subsp. imbricans L. R. Heckard 1974-9-9 3857 Colusa ca. 1/4 mi se Foutch Camp; Snow Mt. 1828 Comment
  CAS-BOT-BC102381  Populus fremontii Roxana S. Ferris 1917-4-17 624 Colusa Sycamore, Sycamore Slough 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
  CAS-BOT-BC454026  Potamogeton pusillus subsp. pusillus Milo S. Baker 1946-9-4 11594 Colusa West Gridley Rd, Butte Sink Comment
  CHSC46886  Potamogeton pusillus var. tenuissimus Vernon Oswald 1989-9-12 4006 Colusa Letts Lake in the Mendocino National Forest, ca. 10 mi (air) sw of Stonyford. On the edge of the lake. 1365 Comment
  UCD82732  Potentilla Craig Thomsen; G. Harrington 2009-5-14 2911 Colusa Colusa County on Walker Ridge: south of spur road about 1/2 mile east of Walker Ridge Road, en route to Eaton Springs. 813 Comment
  UC1607563  Potentilla drummondii Barbara Ertter with Elizabeth Neese 1989-7-2 8627 Colusa ca. 11 air mi due w Stonyford (Long Glade s of Milk Ranch just w of Snow Mt. West); just w Snow Mt. West 1956 Comment
  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
  CHSC94739  Pseudognaphalium californicum Lowell Ahart 2006-6-15 12791 Colusa On the west side of Forest Road 18N03, about 100 yards north of Mill Creek, near Fouts, Mill Creek Campgrounds, about 5 3/4 miles (air) west-southwest of Stonyford. 500 Comment
  UCD159336  Pseudognaphalium californicum D. S. Park; E. Dean 2010-6-5 120 Colusa Walker ridge, Cold Spring Mt. roadside on exposed slope. 935 Comment
  UCR119099  Psilocarphus brevissimus Beecher Crampton 1953-4-29 1146 Colusa Sacramento Valley, 3 miles east of Maxwell 91 Comment
  UCD133714  Psilocarphus brevissimus Beecher Crampton 1953-4-29 1146 Colusa 3 miles east of Maxwell. Comment
  UCD36225  Psilocarphus brevissimus Beecher Crampton 1953-4-29 1146 Colusa 3 miles east of Maxwell. Comment
  CHSC107119  Psilocarphus brevissimus var. brevissimus L. P. Janeway; B. Castro 2011-4-27 10241 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 1.8 km southeast of Funks Reservoir and 0.3 km northeast of Tehama-Colusa Canal. On bare ground in re-vegetating old vehicle tracks through north edge of the marsh. 49 Comment
  JEPS18022  Psilocarphus brevissimus var. brevissimus George B. Rossbach 1955-4-9 558 Colusa 3 mi e Maxwell; Sacramento Valley 18 Comment
  JEPS40460  Psilocarphus brevissimus var. brevissimus W. L. Jepson 1934-5-3 16598 Colusa College City Comment
  UC1073297  Psilocarphus brevissimus var. brevissimus George B. Rossbach 1955-4-9 558 Colusa 2 mi e Maxwell; Sacramento Valley 18 Comment
  CHSC115395  Psilocarphus oregonus Lowell Ahart 2015-4-10 20008 Colusa Along the south edge of Leesville Road, about 1/2 mile east of Leesville, about 12 miles (air) northwest of Williams. 445 Comment
  CHSC60658  Psilocarphus oregonus Vernon H. Oswald 1993-4-14 5268 Colusa Tour Route, Colusa National Wildlife Refuge, SW of Colusa. On top of a levee road branching off of the S leg of the tour route. 18 Comment
  CAS-BOT-BC361876  Psilocarphus tenellus Roxana S. Ferris 1917-4-12 526 Colusa 4 miles east of Williams Comment
  JEPS75721  Psilocarphus tenellus L. R. Heckard 1974-9-9 3853 Colusa just se Foutch Camp; Snow Mountain 1889 Comment
  UC1613326  Psilocarphus tenellus Charles M. Belshaw 1937-4-1 2871 Colusa vicinity Cook's Spring (Devil's Ridge); Inner N. Coast Range, Devil's Ridge Comment
  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
  CHSC62847  Pterostegia drymarioides Vernon H. Oswald; Lowell Ahart 1994-3-23 6018 Colusa Goat Mtn. Rd. just W of the bridge over Sullivan Creek, S of Stonyford. Growing at the base of an outcropping of serpentine. 505 Comment
  CHSC79346  Pterostegia drymarioides B. Castro; L. P. Janeway 2000-4-10 1064 Colusa Vicinity of Sites in rolling hills near Sulphur Gap, among un-named tributaries to Lurline Creek. 121 Comment
  JEPS15216  Purshia tridentata var. tridentata Rimo Bacigalupi with L. T. Dempster, Mrs. P. A. Munz and G. T. Robbins 1956-7-25 5747 Colusa about 0.75 mi w Fouts Camp (s shoulder of Snow Mountains, Colusa-Lake County boundary); Snow Mountains 1905 Comment
  UCD117828  Pyrola aphylla M. Vincent 1968-6-6 789 Colusa On road to Stony Ford from Goat Mt. 2 4/10 miles west of Old Mills Campground. Comment
  SFV10851  Pyrola picta M. L. Vincent 1968-6-6 789 Colusa On road to Stony Ford from Goat Mountain, 2.4 miles west of Old Mills Campground. 1220 Comment
  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
  JEPS75762  Quercus L. R. Heckard, and R. Bacigalupi 1976-9-6 4451 Colusa Fouts Camp-Summit Spring trail Snow Mt. 1584 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
  UCD81221  Quercus berberidifolia Ellen Dean; K. Mawdsley, B. Rice, G. Harrington, and J. Alderson 2009-5-6 5558 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. Ridges and canyons south of Destanella Flat. 467 Comment
  CHSC90879  Quercus chrysolepis D. Isle 2003-6-25 215 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. 1767 Comment
  UCD81241  Quercus chrysolepis Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5405 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Inside canyon that is located to the south of Brophy Canyon. 292 Comment
  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
  CDA16129  Quercus durata G. F. Hrusa 1999-2-13 14914 Colusa North Coast Ranges; Slopes along Little Stony Creek, on road to Cedar Camp and Goat Mtn. 0 Comment
  UCD163843  Quercus durata Craig D. Thomsen 2000-6-1 s.n. Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCR52364  Quercus durata L. Blackford, S. Branch, D. Malm 1988-4-16 62 Colusa 6.1 mi. on Walker Ridge Road off Hwy 20 at Blue Oak campground 732 Comment
  SEINET13953266 Image available Quercus durata Steven Lagos 1974-1 51 Colusa Wilbur Springs Quad., 3000 ft. 914 Comment
  HSC71309  Quercus durata var. durata Thomas W. Nelson, Jane P. Nelson 1979-4-12 4617 Colusa Along Stony Creek below Digger Pine Campground Comment
  CAS-BOT-BC376598  Quercus lobata Andrew Townesmith; Karen M. Meyer 2007-8-7 908 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 499 Comment
  RSA758621  Quercus lobata George K. Helmkamp 2008-10-14 14258 Colusa Sacramento Valley: along CA-20, 0.2 mile east of the Sutter County Line 9 Comment
  UCD57625  Quercus lobata Michele Lanctot; with Plant Biology 102 2007-4-29 1 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central part of ranch. Thompson Canyon. North side of Thompson Creek. 356 Comment
  RSA623529  Quercus palmeri Roger Raiche 1990-12-2 s.n. Colusa Across Sulphur Creek from Wilbur Springs Comment
  SBBG111416  Quercus palmeri R. Raiche 1990-12-2 Colusa across Sulphur Crk from Wilbur Springs Comment
  UCD14524  Quercus palmeri Roger Raiche 1990-12-2 A Colusa California, Colusa Co.; across Sulphur Creek from Wilbur Springs; Comment
  UCD14525  Quercus palmeri Roger Raiche 1990-12-2 B Colusa California, Colusa Co.; across Sulphur Creek from Wilbur Springs; Comment
  UCD14526  Quercus palmeri Roger Raiche 1990-12-2 C Colusa California, Colusa Co.; across Sulphur Creek from Wilbur Springs; Comment
  UCD14527  Quercus palmeri Roger Raiche 1990-12-2 D Colusa California, Colusa Co.; across Sulphur Creek from Wilbur Springs; Comment
  CAS-BOT-BC104659  Quercus wislizeni L. Blackford; S. Branch; D. Malm 1988-4-16 63 Colusa 13.8 miles of Hwy. 20 on Walker Ridge Road 975 Comment
  UCD47499  Quercus wislizeni W. P. Hackett 1960-4-12 29 Colusa 1.7 miles north of Bartlett Springs Road from junction of State Highway 16 and State Highway 20, Colusa County, California. Comment
  UCD47645  Quercus wislizeni Jean Addicott 1963-5-12 44 Colusa On road to Leesville, 16 miles north of junction of State Highways 16 and 20. Comment
  CAS-BOT-BC234979  Quercus wislizeni var. frutescens Ellen Dean; C. Thomsen; G. Harrington; R. Wilmarth; R. Wenk 2010-6-2 6064 Colusa On Lake County border. Walker Ridge. Along Walker Ridge Road, between Cold Spring and Buck Flat 971 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
  UCD72390  Quercus wislizeni var. frutescens Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5116 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Southwestern edge of ranch above Cache Creek Canyon along ridge trail. 548 Comment
  UCD84512  Quercus wislizeni var. frutescens Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6063 Colusa Colusa County. On Lake County border. Walker Ridge. Along Walker Ridge Road, between Cold Spring and Buck Flat. 971 Comment
  UCD159337  Rafinesquia californica D. S. Park; E. Dean 2010-6-5 121 Colusa Walker ridge, Cold Spring Mt. roadside on exposed slope. 935 Comment
  JEPS80085  Ranunculus alismifolius L. R. Heckard with J. Hickman 1979-6-16 5092 Colusa about 1/2 mi s Milk Ranch (nw of West Peak, Snow Mt.) 2011 Comment
  JEPS83801  Ranunculus alismifolius var. alismifolius L. R. Heckard and J. C. Hickman 1982-7-7 5955 Colusa just n West Ridge Pass (along Cedar Camp-Milk Ranch Trail, pass is nw of West Peak); Snow Mt. 2011 Comment
  POM312419  Ranunculus bongardii G. Thomas Robbins, S. Galen Smith 1950-4-15 1907 Colusa Colusa County: In wet mud and vernal pool, Bear Valley Comment
  CAS-BOT-BC378936  Ranunculus californicus var. californicus Roxana Ferris 1917-4-15 612 Colusa Sycamore Slough Comment
  CHSC86880  Ranunculus canus B. Castro 2003-4-1 1408 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 146 Comment
  SEINET8696617  Ranunculus canus var. canus R. R. Halse 2013-3-26 8740 Colusa Along the Leesville Road, ca. 5.6 miles NW of its junction with CA Hwy 20, W of Williams. 157 Comment
  CHSC62943  Ranunculus hebecarpus Vernon H. Oswald; Lowell Ahart 1994-4-6 6057 Colusa Goat Mtn. Rd. 0.1 mi NE of Digger Pine Flat, S of Stonyford. On a roadside bank. 463 Comment
  CHSC79555  Ranunculus hebecarpus B. Castro; L. P. Janeway 2000-5-4 1127 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 246 Comment
  UCD57623  Ranunculus hebecarpus Joseph A. E. Stewart; with Plant Biology 102 2007-4-29 5 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central part of ranch. Craig Canyon. South side of unimproved road. 335 Comment
  SEINET12091630  Ranunculus hebecarpus C. L. Eddy 1984-1 3 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. Wilbur Springs Quadrangle, 15 143 Comment
  UCSB63942  Ranunculus hebecarpus McBride, Marjorie 1986-4-5 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. Wilbur Springs Quadrangle, 15'. E central border of Sect, 32. T15N, R4W. 143 Comment
  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
  UCD56912  Ranunculus occidentalis Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3515 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. In Craig Canyon. 318 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
  UCD83757  Ranunculus occidentalis Ellen Dean; G. Harrington, K. Mawdsley, J. Shepard 2010-5-1 5953 Colusa Colusa County. Walker Ridge. Along Walker Ridge Road, Buck Flat. 875 Comment
  RSA268199  Ranunculus occidentalis var. eisenii Lyman Benson 1935-3-27 6327 Colusa 3 miles E of Lake County line Inner N coast, Sacramento River, Ukiah-Tahoe 610 Comment
  UCD97058  Ranunculus orthorhynchus var. bloomeri G. Thomas Robbins; S. Galen Smith 1950-4-15 1907 Colusa Bear Valley. Comment
  UCD97060  Ranunculus orthorhynchus var. bloomeri Clinton C. Shock 1980-5-3 62 Colusa Bear Valley, ca. 12 miles north west of State Highway 20. 384 Comment
  CDA8773  Raphanus raphanistrum Richard R. Halse 2007-3-22 7104 Colusa By the junction of 5th Street and B Street, Williams. (39.1586 N,122.14724 W) Comment
  CAS-BOT-BC74220  Raphanus sativus Roxana Stinchfield 1916-7-11 438 Colusa Stinchfield Ranch near Sycamore. Comment
  POM332451  Rhamnus californica Thomas W. Nelson, Jane P. Nelson 1978-4-29 3961 Colusa Along Bear Valley Rd., 2 miles from jct with Hwy 20. 366 Comment
  SEINET13946282 Image available Rhamnus californica A. A. Heller 1916-1 12360 Colusa Coast Range on the grade about 3 mi W of Leesville Comment
  CHSC39791  Rhamnus ilicifolia Eloise Gallatin 1935-5-12 Colusa Above Stonyford. Comment
  JEPS42073  Rhamnus tomentella subsp. crassifolia J. D. Coffman 1923-6-4 Colusa betw Leesville and Bartlett Sprs; <Briona Hill?> Comment
  RSA289466  Rhamnus tomentella subsp. crassifolia Edward Lee, C. M. Belshaw 1936-12-13 2612 Colusa Stonyford - Lodoga Road Comment
  UCR228656  Rhamnus tomentella subsp. crassifolia Ellen Dean, Davis Botanical Society 2008-5-31 4996 Colusa West of Hwy I-5 at Maxwell, along Goat Mountain Road,following Little Stoney Creek, Little Stoney Creek Canyon 414 Comment
  JEPS80808  Rhamnus tomentella subsp. tomentella L. R. Heckard and J. C. Hickman 1981-7-31 5780 Colusa e side Snow Mt.; , Fouts Springs Overlook 1783 Comment
  POM136497  Rhamnus tomentella subsp. tomentella Roxana Stinchfield 1916-7-10 478 Colusa In Oak grove Phillips Ranch Comment
  CHSC75707  Rhododendron occidentale Vernon H. Oswald; Lowell Ahart 1999-6-22 9788 Colusa 2.2 mi west of Stonyford-Lodoga Road on County Road 42 paralleling Little Stony Creek. 426 Comment
  HSC62926  Rhus aromatica Marla J. Carollo 1979-4-14 26 Colusa Buch Flat on Walker Ridge Rd. 884 Comment
  UCD116923  Rhus aromatica D. Sanchez-Mata 1998-7-9 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain Road between Lodoga and Red Rock Cabin. At Stoney Creek. 450 Comment
  UCD82135  Rhus aromatica Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5667 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 869 Comment
  RSA589945  Rhus trilobata Michael A. Vincent, Robert Rhode 1996-3-30 7274 Colusa Along Highway 16, near mile marker 5\55, 5.55 mi. S jct. Highway 20 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
  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
  SFV14515  Ribes roezlii M. L. Vincent 1968-6-6 786 Colusa Goat Mountain Road, 1 mile from Stony Ford turnoff. 1825 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
  JEPS75851  Ribes roezlii var. cruentum L. R. Heckard 1974-9-10 3897 Colusa e slope East Peak; Snow Mt. 2103 Comment
  CAS-BOT-BC173957  Ribes viscosissimum Volney Rattan 1884-6-1 s.n. Colusa Black Butte. Coast Mts. North of San Francisco Bay Comment
  CDA33839  Ricinus communis David Brown 2010-10-13 PDR# 1552532 Colusa 0 Comment
  CHSC86965  Rigiopappus leptocladus B. Castro; Michelle Cedarborg 2003-5-6 1428 Colusa Vicinity of Logan Ridge, Sites Peak and Lurline Creek. 188 Comment
  CHSC94628  Rigiopappus leptocladus Lowell Ahart 2006-6-11 12666 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
  HSC48145  Rigiopappus leptocladus Thomas W. Nelson, Jane P. Nelson 1978-4-30 3966 Colusa Along Hwy. 20, E of Colusa-Lake county line 549 Comment
  JEPS80179  Rigiopappus leptocladus L. R. Heckard with J. Hickman 1980-7-3 5331 Colusa just w Summit Springs (sw <side of?> mt., ca 10 mi w of Stonyford, Colusa-Lake Co. boundary); Snow Mt. 1548 Comment
  CHSC88586  Rosa californica L. P. Janeway; B. Castro 2001-6-3 7097 Colusa Inner North Coast Ranges. Spring at Grapevine Flat, on top of Walker Ridge about 0.8 km east of Baldy Mountain. 884 Comment
  CAS-BOT-BC110478  Rumex Roxana Stinchfield 1916-7-9 418 Colusa Overflow land on Sacramento River - Phillips Ranch. Comment
  UCD82155  Rumex conglomeratus Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5681 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 843 Comment
  CHSC29731  Rumex obtusifolius K. R. Stern 1980-5-5 6625 Colusa Vernal pool, south central border area of Colusa National Wildlife Refuge. 45 Comment
  CDA36215  Rumex pulcher G. K. Helmkamp, E. A. Helmkamp 2009-5-2 14745 Colusa Inner Coast Range; Along CA Hwy 16 at Cowboy Camp 1.0 mile south of the junction with CA-20, adjacent to Bear Creek. Comment
  HSC102730  Saccharum ravennae J. P. Smith 2013-8-23 13779 Colusa Along State Route 16 above Cache Creek. 192 Comment
  UC72585  Sagina apetala Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  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
  CHSC78976  Salicornia virginica Vernon H. Oswald; Joseph G. Silveira 2000-9-29 9972 Colusa Delevan National Wildlife Refuge. 15 Comment
  CHSC78977  Salicornia virginica Vernon H. Oswald; Joseph G. Silveira 2000-10-12 9976 Colusa Sacremento National Wildlife Refuge. 18 Comment
  CAS-BOT-BC103026  Salix bonplandiana Roxana S. Ferris 1926-4-23 6401 Colusa near Mountain House on Williams - Stonyford Road Comment
  HSC71301  Salix breweri Thomas W. Nelson, Jane Nelson 1979-4-12 4525 Colusa Along Stony Creek below Digger Pine Campground Comment
  UCD163647  Salix breweri Craig Thomsen 1998-6-19 1943 Colusa Bear Valley. About 8.5 miles north of Hwy 20. Comment
  UCD57307  Salix breweri Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3678 Colusa BLM Payne Ranch. Lands to the southwest of junction of Hwy. 20 and Hwy. 16. Thompson Canyon, near juncture with Craig Canyon. 362 Comment
  UCD63618  Salix breweri Craig D. Thomsen 1999-5-12 2032 Colusa BLM Payne Ranch. Approximately 0.5 mile southwest of intersection of Hwy 16 and Hwy 20. Along ephemeral drainage west of large hillslope/peak. Comment
  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
  UC1179059  Salix exigua var. hindsiana Herbert L. Mason 1947-3-29 13157 Colusa ca. 3 mi n.e. Colusa (along Butte Creek, Butte Sink) Comment
  UC1786437  Salix exigua var. hindsiana Edward L. Smith 1965-4-16 659 Colusa One mile east of Colusa. Comment
  CAS-BOT-BC107838  Salix gooddingii Roxana Stinchfield 1916-7-7 397 Colusa Sycamore slough near Sycamore Comment
  CDA12799  Salix laevigata G. F. Hrusa 1996-2-26 12634 Colusa Inner North Coast Ranges; On Sites-Lodoga Rd. ~2.5 m. NW of Sites at base of Little Antelope Grade. Comment
  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
  UCD61464  Salix laevigata Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3910 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 1.5 miles SW of parking lot in Eula Canyon. 310 Comment
  UCD82128  Salix laevigata Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5658 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 839 Comment
  JEPS86636  Salix lasiolepis L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-18 6686 Colusa sw flank Snow Mt. (n side of West Peak) 2000 Comment
  JEPS80820  Salix melanopsis L. R. Heckard and J. C. Hickman 1981-7-31 5791 Colusa e side Snow Mt. (<along> Dark Hollow Creek) 1584 Comment
  JEPS98267  Salsola soda Vernon H. Oswald and Joseph G. Silveira 2000-10-12 9978 Colusa Delevan National Wildlife Refuge; adjacent to the main refuge road 0.2 mi N of Maxwell-Colusa Road 18 Comment
  RSA718219  Salsola soda L. Ahart 2006-9-26 13348 Colusa Between the deep ditch and the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5.5 miles east of Maxwell. 24 Comment
  CDA11412  Salvia columbariae G. F. Hrusa, K. van Katwyk 1995-4-22 12133 Colusa Inner North Coast Ranges; along Leesville Rd. at summit of ridge immed. E of N end of Bear Valley. Comment
  CHSC19702  Salvia columbariae L. A. Wright Jr. 1971-3-27 7 Colusa Scattered ca. 7 mi w of Williams on Hwy 20. Comment
  CHSC60750  Salvia columbariae Vernon H. Oswald; Lowell Ahart 1993-5-27 5432 Colusa Sites-Lodoga Rd. ca. 0.4 mi W of Grapevine Pass (4.6 road mi E of Lodoga). 481 Comment
  CHSC86526  Salvia columbariae B. Castro 2003-3-18 1388 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 243 Comment
  JEPS24944  Salvia columbariae R. F. Hoover 1938-4-24 3228 Colusa ridge between Venado and Leesville Comment
  JEPS62672  Salvia columbariae R. F. Hoover 1938-4-24 3228 Colusa ridge between Venado and Leesville (e of Leesville) 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
  UCD125703  Salvia columbariae Bob Zasoski 1967-5-6 25 Colusa around 6 miles north from State Highway 20 on Bear Valley Road (to Leesville). 396 Comment
  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
  CAS-BOT-BC238630  Sambucus nigra subsp. caerulea Roxana Stinchfield 1916-7-8 389 Colusa Sycamore Slough, Stinchfield ranch 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
  CAS-BOT-BC223208  Sanicula bipinnatifida Roxana S. Ferris 1917-4-14 589 Colusa 5 mi west of Arbuckle, Arbuckle-Rumsey Road Comment
  JEPS228  Sanicula bipinnatifida W. L. Jepson 1932-5-8 16273 Colusa Lodoga; w Colusa Co. Comment
  CDA34108  Sanicula bipinnatifida P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 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
  UCD82528  Sanicula tuberosa Craig Thomsen; G. Harrington 2009-5-12 2884 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
  CHSC110853  Schoenoplectus acutus var. occidentalis David Isle; Rhonda Isle 2013-6-27 2046 Colusa Above (S of) 18N01, ~200 yards NW of jct with OHV Trail 17N12; (~3/4 mi SW of Fouts Springs Loop Rd, E side). 670 Comment
  UC841012  Schoenoplectus americanus A. A. Heller 1916-6-9 12390 Colusa about 8 mi w Williams (along a stream); Coast Range, w of Williams Comment
  POM185714  Schoenoplectus maritimus Roxana Stinchfield 1916-7-11 467 Colusa Davis Tule, near Sycamore Slough. Comment
  CHSC46320  Schoenoplectus pungens Vernon Oswald 1989-6-3 3795 Colusa Little Stony Creek at the mouth of Frenzl Creek, ca. 6 mi s of Stonyford, north edge of Frenzel Creek Research Natural Area, Mendocino National Forest. 426 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
  UCD72538  Schoenoplectus pungens Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3829 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
  JEPS95824  Schoenoplectus pungens var. longispicatus Vernon H. Oswald and L. Ahart 1999-6-22 9772 Colusa Fouts Springs Rd. (M10) 6.7 mi west of Stonyford-Elk Creek Rd.: T18N R7W Sect. 33, 1960 ft, chaparral, serpentine substrate 597 Comment
  UCD55471  Schoenoplectus pungens var. longispicatus Ellen Dean; Gordon Harrington 2006-10-6 3295 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 362 Comment
  UC1100677  Scirpus acutus var. occidentalis Herbert L. Mason, Verne Grant 1946-8-7 12987 Colusa eight mi n Colusa (Butte Sink); , n of Colusa Comment
  UC1100872  Scirpus americanus Herbert L. Mason, Verne Grant 1946-9-5 13114 Colusa Road to Lake County 1.6 mi w Williams; w of Williams Comment
  CHSC62952  Scribneria bolanderi Vernon H. Oswald; Lowell Ahart 1994-4-6 6059 Colusa Goat Mtn. Rd. 0.8 mi SW of Digger Pine Flat, S of Stonyford. Flat bordering the road. 481 Comment
  JEPS21848  Scribneria bolanderi John R. Swanson 1958-4-26 308 Colusa 1.4 mi w of Bear Valley (on road toward Bartlett Springs) 609 Comment
  CHSC86868  Scrophularia californica B. Castro 2003-4-10 1420 Colusa Vicinity of Logan Ridge, Sulphur Gap and Lurline Creek. Cutbank of dirt road. 131 Comment
  JEPS80266  Scutellaria californica L. R. Heckard and J. Hickman 1980-9-16 5450 Colusa e of Snow Mountain, West Peak (first meadow along trail from Frog Pond, Snow Mountain); Snow Mountain 1981 Comment
  JEPS80267  Scutellaria californica L. R. Heckard and J. Hickman 1980-9-16 5450 Colusa e of Snow Mountain, West Peak (first meadow along trail from Frog Pond, Snow Mountain); Snow Mountain 1981 Comment
  JEPS95817  Scutellaria californica Vernon H. Oswald and L. Ahart 1999-6-22 9775 Colusa West of Stonyford on Fouts Springs Rd. (M10) 0.5 mi east of Dixie Glade Picnic Area: T17N R8W Sect. 12, ca. 3200 ft, mixed coniferous forest, serpentine substrate 975 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
  CHSC101618  Scutellaria tuberosa David W. Isle; Teal Richards 2002-4-18 1651 Colusa Mendocino National Forest. N of Fouts Springs, S of Chlorinator Building on road to Bathhouse Trail (Snow Mountain). SE aspect drainage in chamise chamassal site burned during 8/8/01 Trough Fire. Teal Richards-DI Reveg. Study Plot. MDB and M. 524 Comment
  UC71637  Scutellaria tuberosa Miss Alice King 1905-1 Colusa College City Comment
  UCD66959  Scutellaria tuberosa Ellen Dean; Davis Botanical Society 2008-5-31 5003 Colusa west of I-5 at Maxwell, east slope of Goat Mountain, along Goat Mountain Road. 1152 Comment
  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
  UCD64278  Senecio vulgaris Craig D. Thomsen 2000-3-31 2082 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
  UCR238738  Senecio vulgaris George K. Helmkamp, E. A. Helmkamp 2012-2-9 18534 Colusa Sacramento Valley, River Road, 7.1 miles north of Colusa; east side of Sacramento River 18 Comment
  CAS-BOT-BC243614  Setaria pumila Milo S. Baker 1946-9-4 11602 Colusa Butte Sink, West Gridley Road 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
  UCD121993  Sherardia arvensis V. C. Bryant 1925-10-10 s.n. Colusa Arbuckle. Comment
  UCD81249  Sherardia arvensis Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5413 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. South of the canyon that is located south of Brophy Canyon. 375 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
  UC1733754  Sidalcea diploscypha Kay H. Beach 1940-5-16 657 Colusa Colusa and Lake county line 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
  SBBG117358  Sidalcea diploscypha R. E. Rolley 1977-5-8 Colusa 0.3 mi NNW on Bear Valley Rd from Hwy 20 Comment
  CHSC110123  Sidalcea keckii L. P. Janeway 2011-5-11 10278 Colusa Inner North Coast Ranges. Recreation area on southwest side of East Park Reservoir, 0.5 km south-southwest of the dam; 3.7 air km southeast of Stonyford. 374 Comment
  CHSC45331  Sidalcea keckii Vernon Oswald 1984-5-2 1164 Colusa Along the access road on the e side of East Park Res. 0.3 mi n of Site-Lodoga Rd. 365 Comment
  UC583287  Silene californica Lewis S. Rose 1936-4-27 36179 Colusa 11 mi nw Rumsey; nw of Rumsey 304 Comment
  UC852801  Silene californica A. A. Heller 1937-4-24 15351 Colusa on Highway #20, 15 mi w Williams; w of Williams Comment
  POM253020  Silene californica A. A. Heller 1937-4-24 15351 Colusa On Highway #20, 15 miles west of Williams. Comment
  POM914478  Silene californica L. S. Rose 1936-4-27 36179 Colusa 11 miles NW of Rumsey. 305 Comment
  UC1299502  Silene campanulata Freed W. Hoffman 1947-6-19 1674 Colusa Cooks Springs North Coast Ranges, Cooks Springs Comment
  UCD111674  Silene campanulata Christopher Mallek 2008-1 s.n. Colusa Frenzel Creek. 654 Comment
  CAS-BOT-BC388982  Silene laciniata subsp. californica Lewis S. Rose 1936-4-27 36179 Colusa 11 mi. NW. of Rumsey 304 Comment
  CHSC79487  Silene laciniata subsp. californica B. Castro; L. P. Janeway 2000-5-3 1125 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 313 Comment
  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
  SEINET11262894  Silene laciniata subsp. californica Richard R. Halse 2014-3-25 9036 Colusa Along the Bear Valley Road ca. 1.8 miles W NW of its junction with State Hwy 20.; 0 378 Comment
  UCD56665  Silene laciniata subsp. californica Jack Alderson 2007-3-25 1 Colusa BLM Payne Ranch. Destinella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 555 Comment
  UCD23381  Silene laciniata subsp. californica Beverly Ortiz 1978-4-8 16 Colusa Rhizomes spreading horizontally beneath the ground, stems pubescent, flowers red. Moist soil, growing in a litter layer, partially shaded by shrubs, growing on flat on slope. 2 miles north of the intersection of Highway 16 and Highway 20. 408 Comment
  SD22372  Silybum marianum Richard Neil 1938-6-20 Colusa Grimes Comment
  UCR238925  Sinapis alba George K. Helmkamp, E. A. Helmkamp 2012-2-9 18530 Colusa Sacramento Valley, River Road, 7.1 miles north of Colusa; east side of Sacramento River 18 Comment
  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
  UC10834  Sisymbrium officinale J. Burtt Davy May 1898 4273 Colusa near Willows Comment
  HSC31314  Sisyrinchium bellum Carter Schleicher 1974-5-4 27 Colusa 0.75 mi. from T junction of Walker Ridge Rd. and Indian Valley, near Clyde Mine 854 Comment
  UCD66596  Sisyrinchium bellum Craig D. Thomsen 2000-4-28 2247 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
  UCR139084  Sisyrinchium bellum A. Skelly, G. McCabe, B. Bletcher 1996-5-4 37 Colusa 8.4 mi north of Indian Res. Road, on Walker Ridge Road; 57 mi east of Hwy 101 on Hwy 20 701 Comment
  SEINET3992537  Smilacina stellata J. M. Tucker, L. K. Mann 1959-5-30 3529 Colusa Small lake in Mill Valley, ca. 0.25 mi N. W. of Lower Letts Valley, and ca. 4 air miles N. of Goat Mountian Lookout 1219 Comment
  CHSC63425  Solanum elaeagnifolium Vernon H. Oswald 1994-7-18 6411 Colusa Near the S boundary of the Sacramento National Wildlife Refuge located S of Willows, on the S side of Cell 3 of Pool 11 bordering Hunters Creek. Along a levee road. 21 Comment
  NY821077  Solanum parishii R. C. F. Bacigalupi 1950-4-25 3175 Colusa "Grapevine Grade" to Lodoga, ten miles northwest of Sites Comment
  UCD57555  Solanum parishii Andrew Pedersen; with Plant Biology 102 2007-4-29 4 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Meadow on the west side of State Route 16, ca. 2 road miles south of intersection with State Route 20. West side of Bear Creek, at confluence with Craig Creek. 304 Comment
  CHSC94521  Solanum physalifolium var. nitidibaccatum Lowell Ahart 2006-8-22 13223 Colusa South side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford. 349 Comment
  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
  UC1733755  Solanum umbelliferum Kay H. Beach 1940-5-16 658 Colusa Colusa and Lake county line Comment
  RSA695736  Solidago canadensis subsp. elongata D. W. Taylor 1994-10-7 14713 Colusa Little Stony Creek along Goat Mountain Road 2.1 miles west from junction Lagoda-Stonyford Road. 427 Comment
  UCR238926  Sonchus oleraceus George K. Helmkamp, E. A. Helmkamp 2012-2-9 18531 Colusa Sacramento Valley, River Road, 7.1 miles north of Colusa; east side of Sacramento River 18 Comment
  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-BC235305  Sorghum halepense Roxana Stinchfield 1918-7-9 408 Colusa Phillips ranch near Sycamore Comment
  CAS-BOT-BC390102  Spergularia bocconi Roxana Stinchfield 1916-6-15 274 Colusa College City Comment
  CAS-BOT-BC390299  Spergularia macrotheca var. macrotheca Malcom A. Nobs; S. Galen Smith 1949-6-18 874 Colusa Highway 99W, near Delevan Comment
  CHSC53948  Spergularia marina Vernon H. Oswald 1991-4-21 4525 Colusa Two Mile Rd, 3.7 mi south of Maxwell Colusa Rd. On a flat along edge of road through rice fields. 27 Comment
  CAS-BOT-BC390766  Spergularia marina G. B. Rossbach; R. P. Rossbach 1938-5-31 641 Colusa 5 mi. west of Colusa Comment
  CDA41017  Stachys ajugoides var. ajugoides Agr. Comm Staff 1960-5-11 s.n. Colusa [no additional data] 0 Comment
  CHSC94482  Stachys ajugoides var. rigida Lowell Ahart 2006-8-9 13118 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  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
  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
  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
  UC72583  Stellaria media Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  CHSC86516  Stellaria nitens B. Castro 2003-3-17 1382 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 188 Comment
  CHSC79695  Stephanomeria virgata subsp. pleurocarpa G. F. Hrusa 1998-10-28 14899 Colusa Inner Coast Ranges. Along Cedar Camp Rd. as it enters Little Stony Ck. Cyn., approx. 1 mi. from Lodoga/Stonyford Rd. 400 Comment
  JEPS106184  Stephanomeria virgata subsp. pleurocarpa Lowell Ahart 2004-10-4 11424 Colusa On the 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 369 Comment
  RSA703243  Stephanomeria virgata subsp. pleurocarpa L. Ahart 2004-10-4 11424 Colusa On the east side of Leesville Road, about 4.7 miles by road SE of the intersection of Bear Valley Road, Leesville Ladoga road and Leesville Road, NE of Bear Valley. 370 Comment
  UCD55447  Stephanomeria virgata subsp. pleurocarpa Ellen Dean; Gordon Harrington 2006-10-6 3272 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 374 Comment
  UCD111679  Streptanthus Christopher Mallek 2008-1 s.n. Colusa Frenzel Creek. 654 Comment
  CHSC107538  Streptanthus breweri G. F. Hrusa 1998-6-19 14600 Colusa North Coast Ranges. Roadcut above Little Stony Creek. Goat Mtn. Rd. ~ 1 km. W of intersection with Lodoga-Stonyford Rd. 415 Comment
  CHSC27624  Streptanthus breweri Robert Schlising; Timothy Spira 1978-5-13 3245 Colusa Ca 0.5 mi NW jct Hwy 20 and Bear Valley (= Wilbur Springs) Road, along latter. Comment
  JEPS96910  Streptanthus breweri Dean W. Taylor 1998-6-23 16706 Colusa Walker Ridge, along BLM access road 929 Comment
  UC1492724  Streptanthus breweri Freed W. Hoffman 1957-6-26 4264 Colusa 6 mi w Stonyford Comment
  UC1733757  Streptanthus breweri Kay H. Beach 1940-5-16 1258 Colusa Colusa and Lake county line 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-BC61233  Streptanthus breweri Roger Raiche 1985-5-25 RR 50459 Colusa West of Williams, Bear Valley, Bear Valley Road about 1 mile from its origin at Route 20. 365 Comment
  CAS-BOT-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
  CAS-BOT-BC61236  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
  HSC72216  Streptanthus breweri Thomas W. Nelson, Jane P. Nelson 1980-6-24 5872 Colusa Colusa-Lake County line, along trail to Snow Mtn., 0.5 mi. from trailhead 1616 Comment
  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
  SEINET11998398  Streptanthus breweri Unknown 1986-1 60216 Colusa S of Snow Mt., nr intersection of road to Summit Springs & roads 17N29 & 24N02 1280 Comment
  UC1292771  Streptanthus breweri Freed W. Hoffman 2784 Colusa N of road from Leesville to Bartlett Springs, along the summit between Colusa and Lake counties Comment
  UCD73921  Streptanthus breweri G. Ledyard Stebbins 1966-6-6 6431 Colusa Above Frenzel Creek, on slopes of Lovelady Ridge. 609 Comment
  UC1051550  Streptanthus breweri var. breweri Helen K. Sharsmith 1953-6-21 4307 Colusa borders of creek ca 1 mi within boundary of National Forest Inner North Coast Ranges, Mendocino National Forest, Little 670 Comment
  UC1292654  Streptanthus breweri var. breweri Frank W. Gould 1940-5-15 1258 Colusa along Hwy 20 2 mi e Lake-Colusa county line Comment
  UCD57303  Streptanthus breweri var. breweri Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3674 Colusa BLM Payne Ranch. Lands to the southwest of junction of Hwy. 20 and Hwy. 16. Thompson Canyon, near juncture with Craig Canyon. Above Thompson Creek. 366 Comment
  UCD58119  Streptanthus breweri var. breweri Ellen Dean; PLB 102 Class 2007-4-29 3714 Colusa Payne Ranch. West of Hwy. 16. Ca. 2 road miles S of junction of Hwy. 20 and Hwy. 16. Craig Canyon. Along unimproved road. 328 Comment
  CHSC40532  Streptanthus glandulosus Sara E. Wold 1982-3-27 7 Colusa Salt Canyon, n side of Salt Creek, hwy 20, ca. 17.7 km wsw of Williams. 145 Comment
  CHSC40533  Streptanthus glandulosus Jordan Detzer 1977-4-16 19 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 10 mi wsw of Williams. 143 Comment
  CHSC90181  Streptanthus glandulosus John Hanscom 1989-4-1 5 Colusa Salt canyon, n side of Salt Creek, ca. 5 yds. n of Hwy 20, 11 mi wsw of Williams. 143 Comment
  RSA293147  Streptanthus glandulosus J. P. Smith, Jane P. Nelson, Thomas W. Nelson 1978-4-2 9565 Colusa Bear Valley Road, 2.1 miles from its junction with State Route 20. 366 Comment
  UC1053448  Streptanthus glandulosus subsp. glandulosus Rimo Bacigalupi and Arthur Holmgren 1950-4-26 3174 Colusa grade to Lodoga 10 mi nw Sites; Grapevine Grade Comment
  UCR141627  Styrax officinalis var. californicus Roman Gankin 1959-4-19 330 Colusa Along road to Walker Ridge from Bear Valley Comment
  UC763185  Styrax officinalis var. redivivus R. F. Hoover 1941-5-2 4988 Colusa on Williams-Clear Lake highway just e Lake Co. line Comment
  CAS-BOT-BC48091  Styrax redivivus A. A. Heller 1919-5-10 13111 Colusa Grade west of Leesville Comment
  CAS-BOT-BC48092  Styrax redivivus A. A. Heller 1919-5-10 13111 Colusa Grade west of Leesville Comment
  UCD163316  Styrax redivivus Craig D. Thomsen 1997-4-13 1905 Colusa Bear Valley. About 6 miles north of Hwy 20. Vicinity of Trout Creek, north of Deadshot Canyon. Comment
  UCD66531  Styrax redivivus Craig D. Thomsen 2000-4-28 2231 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
  UCD67669  Styrax redivivus D. Sanchez-Mata 1996-6-20 s.n. Colusa Williams. Blue Ridge. Bear Valley. Bear Creek. 350 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
  CHSC61042  Suaeda moquinii Vernon H. Oswald; Mike Wolder, Joe Silveira 1993-7-26 5698 Colusa Colusa National Wildlife Refuge. SE corner of Tract 21 on the S side of the refuge near Ohm Rd., ca. 1 mi N of Ware Rd., ca. 6 mi S of Colusa. 15 Comment
  CHSC29751  Suaeda nigra K. R. Stern 1980-6-30 6653 Colusa Vernal pool, south central border of Colusa National Wildlife Refuge. 45 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.