Search Results — 2000 specimen records retrieved (1630 records with coordinates)
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 Please cite data retrieved from this page: Data provided by the participants of the Consortium of California Herbaria (ucjeps.berkeley.edu/consortium/).
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? Specimen ID Determination * Collector Collection Date Collection Number County Locality Elevation in meters Feedback
  HSC5009  Abies X shastensis J. O. Sawyer 1968-10-12 755 Colusa Colusa/Lake Co. line, Snow Mtn., boundary N of Clear Lake and W of Stony Ford 2134 Comment
  UCR201545  Abutilon theophrasti George K. Helmkamp, E. A. Helmkamp 2008-10-14 14263 Colusa Sacramento Valley, along River Road (generally following the Sacramento River), 8.4 miles north of Colusa 17 Comment
  CAS-BOT-BC334176  Acer negundo var. californicum Roxana S. Ferris 1926-4-22 6301 Colusa near Sycamore Comment
  HSC45700  Achillea millefolium Sheila Logan 1978-4-22 62 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  JEPS73474  Achillea millefolium L. R. Heckard 1972-7-9 3083 Colusa along trail from Frog Pond to Milk Ranch Frog Pond; Snow Mt. (southern range extension) 1950 Comment
  UC1071729  Achillea millefolium J. Clausen 1939-6-26 1743 -4 Colusa 17 mi w of, (just before entering Lake County) Williams Comment
  CAS-BOT-BC29877  Achyrachaena mollis B. Ellyson; J. Hooke; D. Newman 1996-5-4 40 Colusa Bear Valley, Leesville, 1.3 mi. south fo Brim Road on Bear Valley Road; 14.7 mi. on Walker Ridge Road 414 Comment
  CDA11422  Achyrachaena mollis G. F. Hrusa, K. van Katwyk 1995-4-22 12143 Colusa Inner North Coast Ranges; Leesville Rd. approx. 4 m. NW of Hwy. 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
  HSC87056  Achyrachaena mollis P. A. Daly, Rudy Galindo 1988-4-17 56 Colusa 5.2 miles south of Bear Valley Road 390 Comment
  UC88433  Achyrachaena mollis Brandegee 1900-1 Colusa Colusa Junction Comment
  SD197771  Acmispon americanus var. americanus G. K. Helmkamp, E. A. Helmkamp 2008-10-14 14242 Colusa Sacramento Valley: along CA-20, 0.2 miles east of the Sutter County line. 9 Comment
  CAS-BOT-BC479712  Acmispon brachycarpus Ann Howald 2003-6-9 2367 Colusa Inner North Coast Ranges: Indian Valley, east side of East Park Reservoir, c. 3 mi N of Lodoga, N of Last Chance camping area 378 Comment
  UCD163235  Acmispon brachycarpus Craig D. Thomsen 2000-4-28 2250 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 1 mile west of Hwy 20/16 intersection. 345 Comment
  UCD56668  Acmispon brachycarpus Jack Alderson 2007-3-25 4 Colusa BLM Payne Ranch. Destanella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 553 Comment
  UCD63918  Acmispon brachycarpus Craig D. Thomsen 2001-5-24 2508 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection (between Colusa Co. mileposts 2.17 and 2.25). 342 Comment
  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
  HSC94147  Acmispon grandiflorus G. Fred Hrusa 1998-6-19 14638 Colusa Below Fouts Springs on Fouts Springs Rd. to Stonyford. 675 Comment
  CHSC81265  Acmispon rubriflorus L. P. Janeway; B. Castro 2001-4-25 7026 Colusa Vicinity of Grapevine Creek, Sites-Lodoga Road, and Eggman Canyon. 329 Comment
  SD247416  Acmispon rubriflorus Ann Howald 2003-6-9 2362 A Colusa Inner North Coast Ranges: Indian Valley, east side of East Park Reservoir, c. 3 miles north of Lodoga, near Rocky Ridge camping area (Lodoga 7.5'Q) 423 Comment
  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
  UCR261743  Acmispon rubriflorus Ann Howald 2003-6-9 2365 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3 miles north of Lodoga, at Sleepy Hollow camping area 378 Comment
  CHSC27824  Acmispon wrangelianus Catherine Corr 1978-4-8 17 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. 143 Comment
  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
  UCD66470  Acmispon wrangelianus Craig D. Thomsen 2001-4-12 2461 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
  HSC98295  Acmispon wrangelianus D. R. Junell 1965-4-18 25 Colusa 2 mi. E on Hwy. 16 from junction with Hwy. 20 Comment
  JEPS75833  Aconitum columbianum L. R. Heckard 1974-9-11 3943 Colusa s.e. Foutch Camp (just e. of large rocky outcroppings, Snow Mt.); Snow Mt. 1859 Comment
  CHSC1534  Adenostoma fasciculatum V. Holt 1935-5-12 Colusa Near Stonyford. 335 Comment
  UC71996  Adenostoma fasciculatum Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  JEPS124234  Adiantum jordanii Lowell Ahart 2015-4-1 19989 Colusa Inner North /coast Range. 1/2 mile east of Lake County Line, 12 miles (air) east-northeast of Clear Lake (town), 17 miles (air) west of Williams. Comment
  CDA4024  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
  UCD104590  Aeschynomene rudis June McCaskill; with Jim Hill 1990-9-5 s.n. Colusa Colusa Co.; near Princeton in a rice field; Comment
  HSC86927  Aesculus californica Anthony J. Desch, Bryon Cariss 1988-4-16 33 Colusa 2 mi. W on Brim Rd. from corner of Brim Rd. and Bear Valley Rd. 518 Comment
  JEPS80777  Agastache urticifolia L. R. Heckard and J. C. Hickman 1981-7-30 5750 Colusa Trout Creek trail se side Snow Mt.; se side of Snow Mt. 1615 Comment
  JEPS81298  Agastache urticifolia L. R. Heckard and J. C. Hickman 1982-7-5 5912 Colusa s side Snow Mt. (along streamlet below Summit Springs); s side of Snow Mt. 1524 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
  CHSC27803  Agoseris heterophylla K. D. Whitney 1978-4-8 23 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
  CHSC56745  Agoseris heterophylla Ginger S. Gough 1989-4-1 7 Colusa Ca. 0.48km W of jct of Hwys 20 and 16, S side of Bear Creek, ca. 29km SW of Williams. 322 Comment
  CHSC56746  Agoseris heterophylla Joel Hoskins 1989-4-1 2 Colusa Ca. 0.3 mi W of jct of Hwys 20 and 16, S side of Bear Creek, ca. 18 mi SW of Williams. 321 Comment
  CHSC59937  Agoseris heterophylla M. K. Hancharick 1989-4-1 7 Colusa Ca. 0.3 mi W of jct of Hwys 20 and 16, S side of Bear Creek, ca. 18 mi SW of Williams. 321 Comment
  HSC72163  Agoseris heterophylla J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9538 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  UCD64502  Agoseris heterophylla Craig D. Thomsen 2000-3-31 2092 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  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
  JEPS36283  Agoseris heterophylla var. cryptopleura W. L. Jepson 1920-5-24 9029 Colusa Bear Valley Comment
  OBI49665  Agoseris heterophylla var. cryptopleura A. Liston, M. Blumler 1987-4-26 667 -2 Colusa Bear Valley, Lodoga Rd, 6.6 mi S of Bartlett Springs jct Comment
  UCSC010468  Agoseris heterophylla var. cryptopleura Dylan M. Neubauer, Tim Forsell 2016-3-31 595 Colusa (NCoRI) Walker Ridge, Walker Ridge Road, 1.78 air-miles sse Cold Spring Mountain 815 Comment
  JEPS35661  Agoseris heterophylla var. cryptopleura W. L. Jepson 1932-5-7 16266 Colusa Indian Valley, north of Leesville. 518 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
  JEPS110433  Agrostis exarata Lowell Ahart 2006-8-9 13167 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  UCD64033  Agrostis exarata Craig D. Thomsen 2000-6-23 2412 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
  UCD64042  Agrostis exarata Craig D. Thomsen 2000-6-23 2427 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
  CHSC94280  Agrostis viridis Lowell Ahart 2006-8-9 13111 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  UCR227338  Aira caryophyllea Craig D. Thomsen 2001-4-24 2476 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, south side of Hwy 20, c. 0.25 mi west of Hwy 20/16 intersection, near Colusa Co. milepost 3.0 310 Comment
  UCD137975  Alisma triviale P. B. Kennedy 1925-9-18 s.n. Colusa Cortena, Rice Sta. Comment
  UCD141781  Allium L. K. Mann 1958-5-3 s.n. Colusa about 0.8 mile toward Wilbur Springs from Junction of California Highway #16 and #20. Comment
  UCD57115  Allium Gordon Harrington; Diana Hickson 2007-4-7 0019 Colusa Colusa Co. Ca. BLM Payne Ranch, SW intersection of Hwy 16 and Hwy 20, approx. 1/2 m WNW of Roadkill Cafe. 463 Comment
  UCD82470  Allium Craig Thomsen; G. Harrington 2009-5-12 2847 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. About 100 yds south of road (ravine with spring below). 707 Comment
  CAS-BOT-BC459584  Allium amplectens James Jokerst 1985-4-4 2199 Colusa Wilbur Springs Quad., Near Rail Canyon Comment
  JEPS56351  Allium amplectens W. L. Jepson 1932-5-8 16272 Colusa Lodoga 457 Comment
  JEPS73487  Allium amplectens L. R. Heckard 1972-7-9 3099 Colusa se slope of East Peak of Snow Mt. East Peak of Snow Mt. 2072 Comment
  JEPS80119  Allium amplectens L. R. Heckard with J. Hickman 1980-7-1 5275 A Colusa near bottom of s side of East Peak; Snow Mt. 2042 Comment
  UC1299746  Allium amplectens Freed W. Hoffman 1948-6-27 2514 Colusa 8.6 mi sw Fouts Spring; North Coast Ranges, Upper Letts Valley Comment
  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
  SBBG128774  Allium amplectens L. Ahart 2013-5-1 18682 Colusa near a small drainage, N of the wash and State Hwy 20, just E of Lake County Line, 12.2 mi (air) ENE of Clear Lake (town), 17.1 mi (air) W of Williams 566 Comment
  UCD141843  Allium cratericola L. K. Mann; M. D. Mann 1961-4-2 s.n. Colusa Bear Valley. 396 Comment
  CHSC70819  Allium falcifolium B. Castro; D. Isle, L. Hanson, B. Corbin, E. Earl, L. Janeway 1995-4-28 565 Colusa On Walker Ridge just W of Walker Ridge Rd, ca 0.5 mi S of jcn of Walker Ridge Rd and Bartlett Springs Rd, ca 300 ft E of Lake Co. line. 716 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
  POM174570  Allium falcifolium Roxana S. Ferris 1926-4-23 6570 Colusa Dry Creek near Stonyford. Comment
  UCD141854  Allium falcifolium Roman Gankin 1958-4-25 s.n. Colusa 4 miles west of Leesville. Near head of Bear Valley. 304 Comment
  CAS-BOT-BC135885  Allium fimbriatum subsp. purdyi A. A. Heller 1940-5-6 15579 Colusa Summit of the grade on State Highway #20, at the Lake County line. 232 Comment
  CAS-BOT-BC135886  Allium fimbriatum subsp. purdyi James Jokerst 1985-4-5 2204 Colusa Wilbur Springs Quad., near Coyote Peak 456 Comment
  CAS-BOT-BC135888  Allium fimbriatum subsp. purdyi David D. Keck 1933-5-30 2398 Colusa Colusa-Lake County line west of Wilbur Springs. Comment
  CAS-BOT-BC135890  Allium fimbriatum subsp. purdyi David D. Keck 1933-5-30 2398 Colusa Colusa-Lake County line west of Wilbur Springs. Comment
  UC725425  Allium fimbriatum var. purdyi A. A. Heller 1940-5-6 15579 Colusa summit of the grade on State Highway #20, at the Lake County Line State Highway #20, Lake County Line 232 Comment
  UCD57301  Allium fimbriatum var. purdyi Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3672 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
  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
  CHSC2060  Allium peninsulare D. Smith 1935-5-12 Colusa Stonyford hills. 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
  CDA11409  Allium serra G. F. Hrusa, K. van Katwyk 1995-4-22 12130 Colusa Inner North Coast Ranges; E base of ridge immed. E of Bear Valley, along Leesville Road. Comment
  CHSC2063  Allium serra D. Smith 1935-5-12 Colusa Stonyford Hills. Comment
  UC630432  Allium serra Annetta Carter 1938-5-7 1373 Colusa 4 mi n Rumsey; Inner North Coast Range, Comanche Hills 243 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-BC475545  Allium serra Lewis S. Rose 1936-4-27 36181 Colusa 11 miles NW of Rumsey 411 Comment
  CAS-BOT-BC475546  Allium serra A. A. Heller 1919-5-10 13112 Colusa Grade east of Leesville in the oak belt on open grassy slopes. Comment
  CAS-BOT-BC475548  Allium serra H. C. Cantelow 1936-4-11 1184 Colusa Bear Creek Canyon Comment
  HSC71314  Allium serra Thomas W. Nelson, Jane P. Nelson 1979-4-11 4611 Colusa Along Leesville to SR 20 cutoff 5 mi. E of Leesville Comment
  UCD141822  Allium serra L. K. Mann; A. Saghir 1963-5-15 s.n. Colusa along road 3.2 miles past junction of Caliornia 16 and 20, toward Rumsey, SW part of county. Comment
  UCD141825  Allium serra M. Yamaguchi; D. Hughes, D. G. Hunt 1965-4-29 s.n. Colusa 6.6 miles south of Lodoga on Leesville-Lodoga Road, on right side of road. Comment
  UCD141826  Allium serra M. Yamaguchi; D. Hughes, D. G. Hunt 1965-4-29 s.n. Colusa ca. 8.8 miles west of Maxwell (U.S. Highway 99W) or ca. 0.6 mile east of Sites about 180 feet northwest of bridge and old stone house. Comment
  CHSC62939  Allophyllum gilioides subsp. violaceum Vernon H. Oswald; Lowell Ahart 1994-4-6 6060 Colusa Goat Mtn. Rd. at Sullivan Creek, 1.2 mi SW of Digger Pine Flat, S of Stonyford. On slopes bordering Sullivan Creek. 469 Comment
  CHSC86527  Allophyllum gilioides subsp. violaceum B. Castro 2003-3-18 1387 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 228 Comment
  SEINET3872990  Allophyllum gilioides subsp. violaceum Richard R. Halse 2010-3-25 7849 Colusa Along State Hwy. 20 ca 10.7 miles southwest of its junction with Interstate Hwy. 5 at Williams; in Salt Canyon.; 0 154 Comment
  JEPS108914  Alnus rhombifolia Lowell Ahart 2006-8-9 13108 Colusa Gravel bar on the north side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford 422 Comment
  RSA718199  Alnus rhombifolia L. Ahart 2006-8-9 13108 Colusa On north side of Stony Creek, at Mine Camp, about 3.5 miles (air) west of Stonyford. 423 Comment
  UCD110026  Alnus rhombifolia D. Sanchez-Mata 1998-7-10 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain Road between Lodoga and Red Rock Cabin. 128 Comment
  SEINET10510969  Alopecurus californicus Roxana S. Ferris 1917-4-12 Ferris 549 Colusa 4 miles E of Williams. Alkali Plains. Comment
  UCD55944  Alopecurus saccatus A. A. Beetle 1942-5-21 3276 Colusa 12 miles north of Williams. Comment
  UCR201546  Amaranthus blitoides George K. Helmkamp, E. A. Helmkamp 2008-10-14 14264 Colusa Sacramento Valley, along River Road (generally following the Sacramento River), 8.4 miles north of Colusa 17 Comment
  UCD39269  Amaranthus palmeri B. Crampton 1958-6-26 4973 Colusa Grieve road just n.e. of Hershy R.R. siding, 5.5 miles south of College City, Colusa County. Comment
  CAS-BOT-BC55587  Ambrosia psilostachya Roxana Stinchfield 1916-7-8 376 Colusa Along Sycamore Slough. Stinchfield Ranch Comment
  CHSC94748  Ambrosia psilostachya Lowell Ahart 2006-9-26 13350 Colusa Between the deep ditch and the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell. 24 Comment
  JEPS108783  Ambrosia psilostachya Lowell Ahart 2006-9-26 13350 Colusa Between the deep ditch and the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell 24 Comment
  CHSC84957  Ammannia coccinea Lowell Ahart 2003-10-23 10673 Colusa On the east strand of East Park Reservoir, about 1/8 mile northwest of Sites Lodoga Road, about 1 mile north of Lodoga, about 21 miles west of Maxwell. 368 Comment
  SEINET8237697  Ammannia coccinea John Thomas Howell 1944-7-18 19837 Colusa 3 miles west of Williams. Comment
  JEPS110091  Ammannia robusta Lowell Ahart 2006-8-9 13142 Colusa North side and just east of the bridge across Stony Creek, just north of Stonyford 347 Comment
  RSA724959  Ammannia robusta L. Ahart 2006-8-9 13142 Colusa north side and just east of the bridge across Stony Creek, just north of Stonyford. 348 Comment
  CAS-BOT-BC213951  Amsinckia Roxana S. Ferris 1926-4-23 6414 Colusa At mountain house on the Williams-Stonyford Road Comment
  CHSC30012  Amsinckia intermedia John Griffith 1980-4-16 1 Colusa Ca. 7 mi s of Stonyford. 402 Comment
  UC1093628  Amsinckia intermedia Francia Chisaki, Gene B. Newcomb 1958-4-1 1100 Colusa on road to Lodoga (6.6 mi n of junction with Hwy 20) Comment
  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
  UCD82372  Amsinckia intermedia Robin McMaster 1973-4-15 346 Colusa 0.5 mi towards Bartlett Springs from Bear Valley Road. Comment
  CHSC117804  Amsinckia lunaris Jake Schweitzer 2010-4-1 Colusa Inner North Coast Rnages. On BLM parcel, approx. 265 m W of Walker Ridge Road (Bartlett Springs Rd on some maps) 120 m SE of Til Jones Spring. 853 Comment
  CHSC86519  Amsinckia lunaris B. Castro; Beth Hendrickson 2003-3-24 1396 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 323 Comment
  UC1178230  Amsinckia lunaris Peter M. Ray 1950-4-16 1717 Colusa junction of North Fork and Big Stony Creek (on n side of canyon) 548 Comment
  UC1199518  Amsinckia lunaris Annetta Carter 1938-5-8 1385 Colusa 3 mi n Leesville (on Lodoga Road) Comment
  UC762196  Amsinckia lunaris R. F. Hoover 1938-4-23 3204 Colusa grade on Rumsey-Arbuckle Road Comment
  UCD80815  Amsinckia lunaris Ellen Dean, G. Harrington; K. Mawdsley, C. Thomsen, G. Walden, E. McDermott 2009-3-18 5271 Colusa BLM Bear Creek (Payne) Ranch, lands to the SW of the jct of Hwys 20 and 16. Thompson Canyon, W of junction of trail leading to Craig Canyon, north side of Thompson Canyon trail. 363 Comment
  UCD80820  Amsinckia lunaris Ellen Dean, G. Harrington; K. Mawdsley, C. Thomsen, G. Walden, E. McDermott 2009-3-18 5276 Colusa BLM Bear Creek (Payne) Ranch, lands to the SW of the jct of Hwys 20 and 16. SW-facing slope above Lynch Canyon on east side of canyon. 517 Comment
  UCD83661  Amsinckia lunaris Gordon Harrington 2008-4-13 77 Colusa BLM Payne Ranch. Hills SW of junction of Hwy 16 and Hwy 20. W of unnamed creek (flowing now). 388 Comment
  RSA0089733  Amsinckia lunaris J. P. Smith, T. Nelson, Jane Nelson 1978-4-2 9575 Colusa Bear Valley Road, 2.1 miles from its junction with State Route 20. 366 Comment
  UC76158  Amsinckia lycopsoides Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  RSA0089738  Amsinckia lycopsoides Roxana S. Ferris 1926-4-23 6414 Colusa At Mountain House on the Williams-Stonyford Road. Comment
  UCD119725  Amsinckia lycopsoides Peter M. Ray 1950-4-15 1712 Colusa Road to Leesville, 1.5 miles south of Lodoga. 381 Comment
  CHSC78593  Ancistrocarphus filagineus J. Marr; H. West, C. Warren, J. Lacey-Rickert, N. Wight 1998-4-14 Colusa Vicinity of Antelope Valley. 137 Comment
  JEPS16206  Ancistrocarphus filagineus Rimo Bacigalupi and Arthur Holmgren 1950-4-26 3182 Colusa just w of, (w of base of grade to Indian Valley (Bartlett Mt. Road)) Bear Valley; Inner North Coast Ranges, Indian Valley, Bear Valley Comment
  UCD56923  Ancistrocarphus filagineus Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3526 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Near headwaters of Craig Canyon. 359 Comment
  UCD64285  Ancistrocarphus filagineus Craig D. Thomsen 2000-3-31 2118 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  CHSC89861  Androsace elongata subsp. acuta B. Castro; L. P. Janeway 2001-4-18 1235 Colusa Vicinity of Grapevine Creek, Sites-Lodoga Road, and Scotties Spring. On low terrace just above riparian corridor paralleling dirt road adja-ent to perennial N-S-trending creek. 274 Comment
  CHSC42571  Angelica tomentosa Vernon Oswald 1984-7-20 1612 Colusa Near the Lily Pond n of Letts Lake in the Mendocino Nat. Forest. 1280 Comment
  CHSC32214  Antennaria geyeri James Jokerst 1980-8-6 1060 Colusa North Coast Ranges. Near Snow Mountain (West). Comment
  CAS-BOT-BC69129  Antennaria geyeri G. Thomas Robbins; L. R. Heckard 1956-7-25 3722 Colusa At summit of Snow Mt. West 2145 Comment
  UCD163652  Antirrhinum cornutum Craig Thomsen 1998-6-10 1950 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCD164147  Antirrhinum cornutum Craig Thomsen 1997-6-21 1929 Colusa Bear Valley. About 8 miles north of Hwy 20, central Bear Valley. Comment
  UC103457  Antirrhinum subcordatum Volney Rattan Jun 1884 Colusa Stony Creek; ; Stoney Creek, Colusa Co. Comment
  UC726114  Antirrhinum subcordatum A. A. Heller 1940-6-7 15717 Colusa ridge e Lodogo Comment
  RSA0037103  Antirrhinum subcordatum David W. Isle, Rhonda Isle 2013-5-19 2039 Colusa 0.1 mi E of Maxwell Grade Summit; N of Sites Lodoga Road. July 2012 Sites Fire Area GPS (NAD27 CONUS) 10S. Comment
  UCD70221  Antirrhinum vexillocalyculatum D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. 370 Comment
  JEPS108788  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
  JEPS127575  Antirrhinum virga David Isle 2015-6-20 2157 Colusa North Coast Ranges: ~4 miles W of Stonyford; SE of curve at culvert crossing just E of old dumpsite road junction; uphill ~200' S of 18N01 in 2012 Mill Fire area chaparral. (Gilmore Peak 7.5' Quad.) Comment
  UCD123477  Antirrhinum virga A. M. Shapiro 1994-6-13 s.n. Colusa just north of Goat Mountain Rd. on Sullivan Ridge. 914 Comment
  CHSC115753  Antirrhinum virga David Isle 2015-6-20 2155 Colusa 10S -0533810E, 435732N . North Coast Range: 3.75 miles W of Stonyford and 100 yds S of road 8N01; S of Bob Angulo mobile home; on E edge of old 4x4 road/firebreak in chaparral. 427 Comment
  JEPS87724  Apiastrum angustifolium Vernon H. Oswald and Lowell Ahart 1994-3-23 6017 Colusa just w of bridge over Sullivan Creek (s of Stonyford, Goat Mountain Road); Goat Mountain Road 505 Comment
  IRVC29688  Apocynum androsaemifolium Mark A. Elvin, Mark S. Brunell, David Isle 2006-8-3 5030 Colusa Snow Mtn; Summit Spring Trail; 1.4km W of Snow Mtn West summit; 800m N of Cedar Camp. Southern Northern Inner Coast Ranges 1989 Comment
  CHSC75667  Apocynum cannabinum Vernon H. Oswald; Lowell Ahart 1999-6-22 9773 Colusa Fouts Spring Rd. (M10) 9.9 mi west of Stonyford-Elk Creek Rd. 624 Comment
  UCD23339  Aquilegia eximia A. M. Shapiro 2003-8-19 s.n. Colusa Little Stony Creek. Partly shaded serpentine riparian habitat. 475 Comment
  JEPS80851  Arabis eschscholtziana L. R. Heckard and J. C. Hickman 1980-7-3 5370 A Colusa sw slope Snow Mt.; , Summit Springs 1554 Comment
  JEPS82549  Arabis glabra var. glabra L. R. Heckard 1983-7-27 6110 Colusa ca. 1/4 mi. w. Summit Springs (s. side Snow Mt.); Snow Mt. 1500 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
  JEPS81346  Arctostaphylos L. R. Heckard and J. C. Hickman 1982-7-6 5943 Colusa about 1/2 mi ne Summit Springs (e of trail, s side of mt.); Snow Mt. 1645 Comment
  UCD15652  Arctostaphylos canescens Rachelle Raymond 1989-4-8 102 Colusa Bear Valley. 1097 Comment
  UCD163030  Arctostaphylos canescens D. O. Burge 2015-7-11 1754 Colusa Summit Springs area. 1480 Comment
  UCD50514  Arctostaphylos canescens J. M. Tucker 1959-5-30 3522 Colusa ca. 1 1/4 miles northwest of Goat Mountain Lookout, Goat Mountain. 1828 Comment
  UC1051740  Arctostaphylos canescens subsp. canescens Helen K. Sharsmith 1953-6-20 4296 Colusa n slope Goat Mountain; Inner North Coast Ranges, Mendocino National Forest 1828 Comment
  JEPS117095  Arctostaphylos canescens subsp. sonomensis Peter Warner 2010-5-16 153 Colusa Walker Ridge Road, ~18.4 km N of jct. with Hwy. 20, along E (Colusa Co.) side of road, scattered on slopes above Zimory Canyon to the west, Trout Creek to east, and adjacent slopes on both sides of road Comment
  UCD66998  Arctostaphylos glandulosa Craig D. Thomsen; Gordon Harrington 2008-7-6 2781 -b 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
  CAS-BOT-BC240291  Arctostaphylos manzanita Ellen Dean; C. Thomsen; G. Harrington; Davis Botanical Society 2010-6-5 6080 Colusa Walker Ridge. Along Walker Ridge Road on southern part of the ridge, south of turnoff to Indian Valley Reservoir 683 Comment
  CDA16131  Arctostaphylos manzanita G. F. Hrusa 1999-2-13 14915 Colusa North Coast Ranges; along Little Stony Creek, on road to Cedar Camp and Goat Mtn. 0 Comment
  SDSU1508  Arctostaphylos manzanita D. F. Howe 1962-5-19 3285 Colusa 11 miles west of Willams on #20. 152 Comment
  CHSC79496  Arctostaphylos manzanita subsp. elegans L. P. Janeway 2000-5-31 6773 Colusa Inner North Coast Ranges. On top of Hornet Nest Ridge, between Hornet Nest Spring and Hornet Nest Hill; about 6.4 km southwest of Stonyford. 884 Comment
  CHSC92603  Arctostaphylos manzanita subsp. elegans D. Isle 2005-7-14 1153 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. In saddle of Board Camp Ridge on 17N10, SE of the Homesites about 1 mile. SE of Boardcamp gate at the junction with OHV Trail 06 and road 17N10. 1633 Comment
  JEPS73519  Arctostaphylos manzanita subsp. elegans L. R. Heckard 1972-7-10 3137 A Colusa between Foutch Camp and Trout Creek crossing; Snow Mt. 1828 Comment
  UC1388337  Arctostaphylos manzanita subsp. elegans Freed W. Hoffman 1948-6-28 2439 Colusa road between Upper Letts Valley and Lower Letts Valley (w Colusa Co.); North Coast Ranges 1219 Comment
  CAS-BOT-BC24379  Arctostaphylos manzanita subsp. manzanita A. A. Heller 1940-2-14 15499 Colusa Three mi. e. of the North Fork of Cache Creek Bridge on State Hwy #20. Comment
  CAS-BOT-BC24380  Arctostaphylos manzanita subsp. manzanita Roxana S. Ferris 1926-4-23 6592 Colusa Near Stonyford. Comment
  CAS-BOT-BC24424  Arctostaphylos manzanita subsp. manzanita C. Hart Merriam 1919-9-16 s.n. Colusa Hershey, se. Colusa Co. Comment
  SD247411  Arctostaphylos manzanita subsp. manzanita Ann Howald 2003-3-11 2278 Colusa Inner North Coast Ranges: Indian Valley, east side of East Park Reservoir, peninsula ca. 2.2 miles north of Lodoga (Lodoga 7.5'Q) 365 Comment
  UCR206665  Arctostaphylos manzanita subsp. manzanita George K. Helmkamp, E. A. Helmkamp 2009-3-17 14395 Colusa Inner North Coast Ranges Foothills, along CA-16 and Bear Creek, 7.0 miles south of the junction with CA-20; just north of the Yolo County line 194 Comment
  SEINET7760675 Image available Arctostaphylos manzanita subsp. roofii Richard R. Halse 2014-3-25 9034 Colusa Along the Bear Valley Road ca. 1.8 mi WNW of its junction with State Hwy. 20. 378 Comment
  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
  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
  UCD15253  Arctostaphylos viscida R. Robichaux 1975-4-20 36 Colusa six miles northwest of Highway 20 on the north side of Walker Ridge road. Comment
  UCD58104  Arctostaphylos viscida subsp. pulchella Ellen Dean; G. Harrington and P. McIntyre 2007-3-16 3351 Colusa Payne Ranch. Along Hwy. 20, just E of Lake Co. border. Ca. 3 road miles west of juncture with Hwy. 16, ca. 0.4 road mile east of Destanella Flat. South side of road. 536 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
  UCD81854  Arctostaphylos viscida subsp. pulchella Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5738 Colusa Walker Ridge. Along Walker Ridge Road. Lookout area with fence and view of Indian Valley Reservoir. North of turnoff to Indian Valley Reservoir and S of turnoff to picnic area. W side of road. 1061 Comment
  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
  SBBG114895  Arctostaphylos viscida subsp. viscida C. Bornstein 1999-3-19 Colusa Brim Rd 396 Comment
Read comments
Dec 10 2014
  UC1299490  Arenaria congesta var. crassula Freed W. Hoffman 1947-6-20 1608 Colusa Nort Coast Ranges, summit of Goat Mountain 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
  CAS-BOT-BC401745  Argemone munita subsp. rotundata Roxana S. Ferris 1926-4-23 6455 Colusa Field at Stonyford Comment
  POM257214  Argemone munita subsp. rotundata Lincoln Constance 1939-5-14 2490 Colusa 1 mile east of Mill Creek Ranger Station 549 Comment
  CHSC87131  Aristida ternipes var. hamulosa B. Castro; Michelle Cedarborg 2003-5-6 1427 Colusa Vicinity of Logan Ridge, Sites Peak and Lurline Creek. 219 Comment
  UC1040776  Aristida ternipes var. hamulosa L. T. Burcham 1955-7-5 317 Colusa 10 mi w Williams 121 Comment
  CAS-BOT-BC82672  Arnica longifolia G. Thomas Robbins; L. R. Heckard 1956-7-25 3712 Colusa Along edge of Dark Hollow Creek (a tributary of Middle Fork Stony Creek), on southern flank of Snow Mt. East, 2011 Comment
  CHSC100273  Arrhenatherum elatius David Isle 1990-6-6 1519 Colusa Mendocino National Forest - North Coast Ranges. Middle Fork Stony Creek Watershed. Lower Letts Valley in moist meadow. MDMB. 1243 Comment
  CHSC61398  Artemisia douglasiana Vernon H. Oswald 1993-8-16 5809 Colusa Sacramento National Wildlife Refuge. Refuge located ca. 7 mi S of Willows, NE corner of Tract 41. 25 Comment
  JEPS110139  Artemisia douglasiana Lowell Ahart 2006-8-9 13100 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford 455 Comment
  JEPS80772  Artemisia douglasiana L. R. Heckard and J. C. Hickman 1981-7-30 5743 Colusa along Trout Creek Trail (se side of Snow Mt.); Snow Mt. 1661 Comment
  UC1609127  Arthrocnemum subterminale Vernon H. Oswald, Mike Wolder and Joe Silveira 1993-7-26 5704 Colusa National Wildlife Refuge. Tract 7, just SW of the headquarters complex on O'Hair Rd, ca 2 mi SW of Colusa. 12 Comment
  SFV10912  Asclepias cordifolia M. L. Vincent 1968-6-6 791 Colusa 1.2 miles west from Stony Ford. 11 mile sign on trip down from Goat Mountain. 375 Comment
  POM129846  Asclepias fascicularis Roxana Stinchfield 1916-7-11 s.n. Colusa Davis Tule, near Sycamore Slough. Comment
  UCD72531  Asclepias fascicularis Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3822 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. West side of Bear Creek, ca. 0.5 mile downstream of bridge. 246 Comment
  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
  JEPS80258  Asclepias fascicularis L. R. Heckard and J. Hickman 1980-9-15 5437 Colusa Summit Springs, n of road Snow Mt., Lake-Colusa County Boundary 1524 Comment
  CAS-BOT-BC222853  Asclepias solanoana G. L. Stebbins 1966-6-6 6432 Colusa Lovelady Ridge, south of South Fork, Stony Creek, 6.5 miles south of Stony ford [Stonyford] 609 Comment
  CHSC32768  Asclepias solanoana James Jokerst 1980-6-27 920 Colusa North Coast Ranges. Near Frenzel Creek Botanical Area. 609 Comment
  UC424842  Asclepias solanoana Milo S. Baker 1929-6-30 3472 b Colusa Snow Mt. Trail to Summit Springs (at Cedar Creek); Snow Mt., Cedar Creek Comment
  UCD58164  Asclepias speciosa Gordon Harrington 2007-5-15 54 Colusa BLM Payne Ranch. Sandy north side of Cache Creek, about 1/2 mile upstream from the confluence of Cache Creek and Bear Creek. 190 Comment
  RSA140825  Aster subulatus var. parviflorus John H. Thomas 1960-8-30 8864 Colusa About 5 miles northwest of College City along road to Sycamore. Comment
  SEINET12318320  Asteraceae J. A. LeFurgey 1978-1 4 Colusa ca 0.3 mi W of jct of hwy 20 & 16, S side of Bear Creek, ca 18 mi SW of Williams 322 Comment
  SEINET12326957  Asteraceae Unknown 1978-1 12 Colusa Salt Canyon, N side of Salt Creek, Hwy 20, 11 mi WSW of Williams 143 Comment
  CDA26624  Astragalus breweri T. C. Fuller 1958-4-17 Colusa 1 mile south of Lodoga. 0 Comment
  UC1049537  Astragalus breweri Rimo Bacigalupi 1950-4-16 3112 Colusa four mi s Ladoga (6 mi nnw of Leesville, in Indian Valley (not the one in Lake County) along Little Indian Creek, eastern base of Inner North Coast Ranges); eastern base Inner North Coast Ranges, Little Indian Creek 396 Comment
  CHSC91565  Astragalus clevelandii D. Isle 1995-7-12 393 Colusa Mendocino National Forest--North Coast Ranges. Bear Creek Watershed. Adjacent to BLM parcel 281-C. 585 Comment
  UCD58179  Astragalus clevelandii Gordon Harrington 2007-5-31 69 Colusa BLM Payne Ranch. Lands to the SW of the intersection of Hwy 16 and Hwy 20. Along Thompson Creek, approximately 3/4 mile downstream from Road Kill Cafe. 357 Comment
  HSC47646  Astragalus gambelianus J. P. Smith, J. O. Sawyer 1978-4-29 9790 Colusa Just W of Walker Ridge Rd. intersection with Bartlett Springs Rd. Comment
  UC863114  Astragalus rattanii var. jepsonianus Alice Eastwood, John Thomas Howell 1938-5-16 5634 Colusa Lake--Colusa County line on road to Williams; road to Williams Comment
  UCD105314  Astragalus rattanii var. jepsonianus J. M. Tucker; Dorothy Dreyfus 1967-4-29 4034 Colusa Bear Valley, 9 miles north of junction of Bear Valley Road with State Highway 20. 403 Comment
  UCD163214  Astragalus rattanii var. jepsonianus Craig D. Thomsen 2000-4-28 2254 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 0.3 mile west of Hwy 20/16 intersection. 345 Comment
  UCD163326  Astragalus rattanii var. jepsonianus Craig D. Thomsen 2009-5-3 2791 Colusa Walker Ridge. Vicinity of Walker Ridge Rd., 0.25 miles north of Hwy 20. Comment
  UCD63032  Astragalus rattanii var. jepsonianus Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4684 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Along west side of Bear Creek, just north of Eula Canyon. 312 Comment
  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
  UCSB3001  Astragalus trichopodus var. lonchus Keator, Glenn 1958-4-16 Colusa Between Hough springs and Bartlett springs on road to Nice Comment
  CHSC115389  Athysanus pusillus Lowell Ahart 2015-4-1 19995 Colusa Near a small drainage, burned over in 2012, rocky serpentine outcrop on the north side of State Highway 20, 1/2 mile east of Lake County Line, 12 miles (air) east-northeast of Clear Lake (town), 17 miles (air) west of Williams. Inner Coast Range. 520 Comment
  JEPS53214  Athysanus pusillus W. L. Jepson 16277 Colusa Lodoga, in Coast Range foothills, w Colusa County Lodoga; Coast Range foothills, Lodoga 457 Comment
  JEPS53235  Athysanus pusillus Alice King May, 1906 Colusa College City Comment
  SEINET5586423  Athysanus pusillus Richard R. Halse 2013-1 8763 Colusa Along State Hwy. 20 just eat of the Colusa/Lake County Line, ca. 14.6 miles east of the junction of State Hwy. 20 and 53 558 Comment
  UCD114233  Athysanus pusillus Beecher Crampton 1958-4-21 4725 Colusa Colusa-Yolo County line, along State Hwy. 16, junction Bear and Cache Creeks, 7.4 miles northwest of Rumsey. Comment
  UCD58109  Athysanus pusillus Ellen Dean; G. Harrington and P. McIntyre 2007-3-16 3361 Colusa Payne Ranch. Along Hwy. 20, Destanella Flat area just E of Lake Co. border. Ca. 3.4 road miles west of junction with Hwy. 16. South side of road. Grassland area to the SSE of Destanella Flat. 572 Comment
  UCD66944  Atriplex Craig D. Thomsen 2000-5-11 2289 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. 304 Comment
  CAS-BOT-BC170615  Atriplex argentea Roxana Stinchfield 1916-7-1 462 Colusa Colusa - Williams Road, at bridge over the Trough Comment
  JEPS90596  Atriplex depressa Dean W. Taylor 1993-8-31 14069 Colusa dry vernal pool ca 200 mi e North Fork Logan Creek (Logandale 7 1/2' USGS quadrangle); Sacramento Valley, Sacramento National Wildlife Refuge 24 Comment
  CHSC107934  Atriplex fruticulosa B. Castro; L. Janeway 2011-7-9 1895 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; approximately 1 mi southeast of Funks Reservoir and 0.2 mi northeast of Tehama-Colusa Canal. In swale about 300 ft north of large +- alkaline marsh. At edge of swale near star-thistle thicket. 49 Comment
  CHSC80183  Atriplex fruticulosa B. Castro; G. Kuenster 2000-7-19 1208 Colusa Vicinity of Maxwell, Funks Creek, and the Glenn-Colusa canal, on low terrace beside S edge of shallow intermittent stream channel draining eastward out of the hills east of Golden Gate. 42 Comment
  CHSC81258  Atriplex fruticulosa Caroline Warren; Beth Hendrickson 1999-6-7 Colusa Vicinity of Funks Creek and Logan Ridge. 91 Comment
  CHSC83637  Atriplex fruticulosa L. P. Janeway 2002-4-25 7524 Colusa Sacramento Valley. Vicinity of Funks Creek and Tehama-Colusa Canal. Drainage bottoms. 51 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
  UCD163857  Atriplex joaquinana Craig D. Thomsen 2001-4-26 2484 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCD97461  Atriplex joaquinana A. A. Heller 1916-6-9 12394 Colusa near Williams. Comment
  CHSC59712  Atriplex persistens K. R. Stern 1980-6-30 6646 Colusa Vernal pool, south central border area of Colusa National Wildlife Refuge. 45 Comment
  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
  CHSC78973  Atriplex triangularis Vernon H. Oswald; Joseph G. Silveira 2000-10-12 9977 Colusa Delevan National Wildlife Refuge. 18 Comment
  CHSC94733  Atriplex triangularis Lowell Ahart 2006-9-26 13347 Colusa Along the deep ditch, south side of the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell. 24 Comment
  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
  SEINET3919645  Avena barbata Patricia Shesgreen 1978-4-22 33 Colusa Wilbur Springs Quad. Bear Valley Road, 1.5 miles from its junction with State Route 20.; 0 411 Comment
  HSC66008  Avena fatua Teri Bartowski, Shane Feusier, Ruth Takaki, Carol Zimmerer 1980-4-19 43 Colusa 5.4 miles from Lodoga, along Little Stony Creek at Digger Pine Campground Comment
  UCD66912  Avena fatua Craig D. Thomsen 2008-4-27 s.n. Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Slopes to the northwest of Eula Canyon and WNW of Cowboy Camp on the west side of Bear Creek. 451 Comment
  UCD82621  Avena fatua Craig Thomsen; G. Harrington 2009-5-12 2891 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  CHSC46039  Azolla microphylla Lowell Ahart 1975-1-25 699 Colusa On the south side of Norman Road, about 1 mile west of Princeton. 30 Comment
  UCD57655  Baccharis pilularis Hildegarde Durkin; 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. Where trail crosses Thompson Creek. 374 Comment
  UCD66921  Baccharis pilularis Craig D. Thomsen; G. Harrington 2008-7-6 2778 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
  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
  HSC79084  Baccharis salicifolia C. G. Phillips, L. Cole, S. A. Haultain, K. B. Barrows 1984-4-29 30 Colusa Mendocino National Forest, Digger Pine Campground, 10 miles SW of Stonyford via Lodoga-Stonyford and Goat Mtn. Rd. 457 Comment
  CAS-BOT-BC100066  Balsamorhiza macrolepis James Jokerst 1985-4-5 2210 Colusa Wilbur Springs Quad. Near Coyote Peak 456 Comment
  CAS-BOT-BC100068  Balsamorhiza macrolepis G. L. Stebbins 1971-6-6 8016 Colusa Walker Ridge, 1/4 mi. south of road from Leesville to Indian Valley 701 Comment
  UCD82586  Barbarea vulgaris Craig D. Thomsen; J. Wiegand, S. Harrison, G. Harrington, A. Fulks 2008-4-22 2731 Colusa Walker Ridge. Eaton Springs, 4 mi N of Hwy 20, ca. 1 mi E of Walker Ridge Rd. 609 Comment
  CHSC61040  Bassia hyssopifolia Vernon H. Oswald; Mike Wolder, Joe Silveira 1993-7-26 5699 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
  CHSC84434  Bassia hyssopifolia Lowell Ahart 2003-8-15 10509 Colusa On the south side of Highway 20, about 1 mile southwest of Williams. 27 Comment
  UCD97545  Bassia hyssopifolia Beecher Crampton 1963-8-3 6868 Colusa 1/4 mile east of Cortena. Comment
  UCD97560  Bassia hyssopifolia P. B. Kennedy 1928-9-15 s.n. Colusa Cortena. Comment
  UC1613495  Berberis aquifolium var. dictyota Charles M. Belshaw 1937-4-25 2838 Colusa vicinity of Cook's Spring (Inner North Coast Range, Devil's Ridge); Inner North Coast Range, Devil's Ridge Comment
  CDA11388  Berberis dictyota G. F. Hrusa, K. van Katwyk 1995-4-22 12108 Colusa Inner North Coast Ranges; Walker Ridge Road approximately 6 miles N of Highway 20. Comment
  HSC90794  Bergia texana Barbara Ertter, Elizabeth Neese, Laura Fujii, Dawn Espindola 1989-10-21 8869 Colusa SE end of E Park Reservoir N of Lodoga 366 Comment
  CAS-BOT-BC100260  Blennosperma nanum var. nanum Roxana S. Ferris 1917-4-12 498 Colusa 4 miles East of Williams Comment
  CHSC117121  Boehmeria cylindrica B. Castro; Tom Boullion 2009-9-29 1800 G-2 Colusa Sacramento Valley. Ca 8 air mi SE of Colusa, via Buster Rd off Hwy 45, just W of Ogden Bend on W bank of the Sacramento River at RM 130.8. 17 Comment
  CHSC117122  Boehmeria cylindrica B. Castro; Tom Boullion 2009-9-29 1800 G-2 Colusa Sacramento Valley. Ca 8 air mi SE of Colusa, via Buster Rd. off Hwy 45, just W of Ogden Bend on W bank of the Sacramento River at RM 130.8. 17 Comment
  CHSC96359  Boehmeria cylindrica D. Koenig; L. Bateman 2006-10-6 Colusa Sacramento Valley. By a slough along the west side of the Sacramento River, about 0.5 mi south-southeast of Stegeman. 21 Comment
  CHSC76535  Bolboschoenus glaucus Heidi West; Caroline Warren, Jenny Marr, Natalie Wight 1998-7-22 Colusa Vicinity of Logan Ridge, Funks Creek, and Hunters Creek. 121 Comment
  CHSC83230  Bolboschoenus glaucus June McCaskill; Harvey, Loren Davis 1954-8-9 361 Colusa Ca. 2 mi. east of Princeton and 400 yds. south of Glenn County line. In rice plot. Comment
  JEPS102226  Bolboschoenus glaucus L. P. Janeway 2001-6-13 7172 Colusa Sacramento Valley. Along Norman Road 5.0 km east of Hwy 99W and Hwy I-5. 23 Comment
  UCD72536  Bolboschoenus maritimus Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3827 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. West side of Bear Creek, ca. 0.25 mile downstream of bridge. 251 Comment
  UCR206359  Brassica George K. Helmkamp, E. A. Helmkamp 2009-3-11 14384 Colusa Sacramento Valley, along CA-20 at Lone Star Road, northeast of Williams 13 Comment
  UCR206539  Brassica rapa George K. Helmkamp, E. A. Helmkamp 2009-1-31 14313 Colusa Sacramento Valley, junction of Moon Bend Road and CA-20 at the south end of the city of Colusa 23 Comment
  SEINET7075565  Brodiaea elegans A. G. Vestal 1955-4-5 3684 Colusa In mountains [Cortina Ridge] west of Williams on Route 20 at Salt Canyon. 39? deg. 6' 22" North Latitude, -122? deg. 19' 15" West Longitude. UTM Zone 10, 558719mE, 4328566mN. (NAD 27)]. [Coordinate Datum: WGS84/NAD83]. Comment
  UCD82131  Brodiaea elegans subsp. elegans Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5657 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 839 Comment
  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
  UCD57609  Bromus arenarius Beecher Crampton 1958-5-19 4802 Colusa 5.8 miles south of Lodoga. Comment
  SEINET11695837  Bromus arenarius Unknown 1960-5-26 T.O. 2509 Colusa 10.1 mi SE of Leesville, E of Three Sisters, grown at UC Davis agronomy experimental area Comment
  CAS-BOT-BC149477  Bromus carinatus var. carinatus F. P. Cronemiller 1924-5-12 877 Colusa Below Lower Letts Valley. 1219 Comment
  JEPS80216  Bromus carinatus var. carinatus L. R. Heckard and J. Hickman 1980-7-3 5372 Colusa near Summit Springs (sw slope of Snow Mountain); Snow Mountain 1554 Comment
  HSC98348  Bromus diandrus Brent Helm, Curtis Miller, Mark Steiger 1988-4-16 63 Colusa Stonyford, off side road underneath Blue Oaks 366 Comment
  RSA714303  Bromus hordeaceus Daisie Huang 2006-4-16 6041602 Colusa 45 S of Grimes. Roadside below Sacramento River pumping station. 9 Comment
  SEINET10514562  Bromus hordeaceus Roxana S. Ferris 1917-4-12 Ferris 527 Colusa 4 miles E of Williams. Alkali Plains. Comment
  UCR228650  Bromus japonicus Ellen Dean, Gordon Harrington, Craig D. Thomsen, S. Harrison 2008-5-18 4934 Colusa Payne Ranch, owned by BLM, lands to the southwest of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20 348 Comment
  CHSC100264  Bromus laevipes D. Isle 1988-4-13 1512 Colusa Mendocino National Forest - North Coast Ranges. Middle Fork Stony Creek Watershed. Mellow-D Ranch meadow just north of 1st bad erosion channel in area burned during 1987 Fouts Fire. 731 Comment
  HSC31698  Bromus laevipes Thomas E. Higley 1974-5-4 63 Colusa 3/4 mi. N of T junction of Indian Valley. 854 Comment
  UCD57485  Bromus laevipes Helen K. Sharsmith 1953-6-19 4266 Colusa Inner north coast ranges. Mendocino National Forest. Red Bridge Camp. Near confluence of North and Middle forks of Stoney Creek. 548 Comment
  UCD66569  Bromus laevipes Craig D. Thomsen 2001-5-24 2531 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UCD59017  Bromus madritensis Beecher Crampton 1958-5-19 4791 Colusa 10.1 miles southeast of Leesville. Comment
  UCD57058  Bromus madritensis subsp. rubens Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3645 Colusa BLM Payne Ranch, mouth of Craig Canyon, along unimproved road, about 2 road miles south of junction of Hwy 20 and Hwy 16. . 316 Comment
  UCD66445  Bromus madritensis subsp. rubens Craig D. Thomsen 2000-4-28 2214 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
  JEPS80793  Bromus orcuttianus L. R. Heckard and J. C. Hickman 1981-7-30 5763 Colusa se Snow Mountain, going down Trout Creek Trout Creek; Snow Mountain, Trout Creek 1569 Comment
  JEPS110259  Bromus pseudolaevipes Lowell Ahart 2006-6-11 12670 Colusa On the east side of an off road trail (Trail 30), about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford 613 Comment
  RSA724142  Bromus rubens R. R. Halse 2002-3-21 6130 Colusa Williams; by junction of 5th Street and B Street. 24 Comment
  SEINET3923292  Bromus rubens Christopher Knopp 1978-4-22 17 Colusa Wilbur Springs Quad. Bear Valley Road 1.5 miles from its junction with State Route 20.; 0 411 Comment
  CHSC94534  Bromus tectorum Lowell Ahart 2006-8-22 13216 Colusa South side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford. 349 Comment
  JEPS80193  Bromus tectorum L. R. Heckard and J. Hickman 1980-7-3 5346 Colusa 10 mi w of Stonyford (just w of Summit Springs, sw Snow Mountain); Snow Mountain 1548 Comment
  UCD65632  Bromus tectorum Craig D. Thomsen 2000-4-12 2133 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  UC1563672  Cacaliopsis nardosmia Barbara Ertter 1989-7-1 8595 Colusa road to Goat Mt. Lookout 2.2 mi s Rt. M-10 (Bear Creek-Fouts Spring Rd) (at head of creek, ca 12 airmiles wsw of Stonyford); S Fork Stony Creek 1500 Comment
  UC1563843  Cacaliopsis nardosmia Barbara Ertter 1989-7-1 8595 Colusa road to Goat Mt. Lookout 2.2 mi s Rt. M-10 (Bear Creek-Fouts Spring Rd) (at head of creek, ca 12 airmiles wsw of Stonyford); S Fork Stony Creek 1500 Comment
  UCD169351  Calandrinia breweri Lowell Ahart 2013-5-1 18673 Colusa On the north side of State Highway 20, just east of Lake County line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  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
  UCD64251  Calandrinia ciliata Craig D. Thomsen 2000-3-31 2053 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  HSC47509  Calandrinia ciliata Sheila Logan 1978-4-21 51 Colusa N of Bear Valley Rd. Comment
  UCD100193  Calandrinia ciliata Mark Hershkovitz 1991-5-3 s.n. Colusa Walker Ridge, along Walker Ridge Rd. nr. Turn-off to Bear Valley on north end; serpentine site. Comment
  CAS-BOT-BC167285  California macrophylla Roxana S. Ferris 1926-4-23 6406 Colusa Grade beyond the Mountain House on Williams - Stonyford Road Comment
  UC1101520  Callitriche marginata S. Galen Smith and G. T. Robbins 1950-4-15 1906 Colusa Bear Valley Comment
  CHSC112277  Calochortus amabilis Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18640 Colusa Inner North Coast Range. North side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  CAS-BOT-BC492117  Calochortus amabilis F. P. Cronemiller 1924-5-10 875 Colusa Mill Creek Ranger Station 609 Comment
  CDA39298  Calochortus amabilis T. C. Fuller 1958-5-27 s.n. Colusa South of Highway 20, 1 mile west of junction with Highway 16. 0 Comment
  RSA0014524  Calochortus amabilis Joan Stewart 1998-6-10 759 Colusa Bear Valley Comment
  UCD139532  Calochortus luteus K. Esau 1934-5-6 s.n. Colusa West of Williams, Ukiah-Tahoe Highway. Comment
  UC1049544  Calochortus uniflorus Rimo Bacigalupi 1950-4-16 3126 Colusa Bear Creek, along road down middle of Bear Valley, about BM 1326 Bear Valley 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
  SEINET8197763  Calochortus uniflorus M. J. Williams 1967-5-7 1187 Colusa Bear Valley. Comment
  SEINET8369630  Calochortus uniflorus Christine C. Lorain 1993-4-20 2235 Colusa 7.1 mi s of Leesville alogn Bear Valley Road near shart 90o turn in road (cattle yard). 427 Comment
  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
  CHSC79447  Calycadenia pauciflora G. F. Hrusa 1998-6-19 14595 Colusa the North Coast Ranges. Small colony on open grassy flat within chaparral/Quercus douglasii woodland. Along Little Stony Creek, on Goat Mtn. Rd. ~ 1/2 km. W of intersection with Lodoga-Stonyford Rd. UTM: 10S, 05401N, 43499E 400 Comment
  HSC94037  Calycadenia pauciflora G. Fred Hrusa 1998-6-19 14595 Colusa Along Little Stony Creek, on Goat Mtn. Rd., ~0.5 km W of intersection with Lodoga-Stonyford Rd. 400 Comment
  UC1552845  Calycadenia pauciflora Frederica Bowcutt 1985-6-19 605 Colusa just sw, n of Wilbur Hot Springs about 2 air miles Bear Valley Comment
  UCD129829  Calycadenia pauciflora Gerald D. Carr 1972-6-14 703 Colusa at the Lake County line on Highway 20. Comment
  UCD61447  Calycadenia pauciflora Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3892 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1500 ft NW of parking lot. 368 Comment
  UCD63726  Calycadenia pauciflora Craig D. Thomsen 2008-5-23 2737 Colusa BLM Payne Ranch. Southwest of intersection of Hwy 16 and Hwy 20. 0.5 mile south of Hwy 20 (south of Destanella Flat), about 2.5 miles west of Hwy 16. 542 Comment
  UCD66946  Calycadenia pauciflora Ellen Dean; Davis Botanical Society 2008-5-31 4992 Colusa west of I-5 at Maxwell, along Goat Mountain Road, immediately west of the junction with Lodoga-Stonyford Road. 382 Comment
  UCD70217  Calycadenia pauciflora D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. Serpentine annual grasslands in serpentine chaparral edges. 370 Comment
  UCR200665  Calycadenia pauciflora Craig D. Thomsen 2008-5-23 2737 Colusa BLM Payne Ranch, southwest of intersection between Hwy 16 and Hwy 20, 0.5 mile south of Hwy 20 (south of Destanella Flat), c. 2.5 miles west of Hwy 16 542 Comment
  CAS-BOT-BC270744  Calycadenia pauciflora Gerald D. Carr 1972-7-29 722 Colusa 1.8 miles E of Walker Ridge Road on Deadshot Road, Deadshot Flat 731 Comment
  CAS-BOT-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-BC270756  Calycadenia pauciflora H. M. Hall 1930-10-3 12936 Colusa 2 miles S of Stoneyford 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
  UC1876244  Calycadenia pauciflora Gerald D. Carr 1972-7-29 722 Colusa 1.8 mi E of Walker Ridge Rd. on Deadshot Rd. 731 Comment
  UC1876259  Calycadenia pauciflora Gerald D. Carr 1971-7-29 608 Colusa 1 mi S of Stoneyford on road to Lodoga. 365 Comment
  UC1876261  Calycadenia pauciflora Gerald D. Carr 1971-7-29 606 Colusa On road to Trout Cr. Trail, 0.5 mi NW of driveway to Fout Spr. Boys Ranch 502 Comment
  UC1971691  Calycadenia pauciflora 1978-8-20 2156 Colusa Bear Valley Road, 0.1 mi N of jct with Brim Road (to Bartlett Springs), ca. 2 mi SW of Leesville (=GDC 651) 482 Comment
  UCD129804  Calycadenia pauciflora Gerald D. Carr 1971-7-29 605 Colusa 1.7 miles west of Lodoga on road to Stoneyford. 411 Comment
  UCD129895  Calycadenia pauciflora Gerald D. Carr 1971-9-15 658 Colusa 6.0 miles north of Yolo County line Hwy 16. Comment
  UCSB6412  Calycadenia pauciflora Keator, Glenn 1958-6-16 Colusa Along road from Lower Lake to Sacramento Valley just east of Lake-Colusa county line Comment
  UCD13380  Calycanthus occidentalis Charles Martin 1986-5-17 29 Colusa 2.8 miles west of Stonyford, along Foot Springs Rd. Comment
  UCD100385  Calyptridium monospermum M. Vincent 1968-6-6 780 Colusa Goat Mt. Road. 1 mile from Stanford turnoff. Comment
  UC1055951  Calyptridium quadripetalum Helen K. Sharsmith 1953-6-18 4261 Colusa above Fouts Springs (on Letts Valley Road, Mendocino National Forest); Inner North Coast Ranges, Mendocino National Forest 731 Comment
  CDA39872  Calystegia collina T. C. Fuller 1958-5-27 3670 Colusa South of Highway 20, 1 mile west of junction with Highway 16. 0 Comment
  UCD63111  Calystegia collina subsp. collina Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4942 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20. 384 Comment
  RSA394936  Calystegia collina subsp. collina Eugene Memmler 1969-5-8 106 Colusa Hwy 20, Between Williams and Clear Lake. 152 Comment
  JEPS81301  Calystegia occidentalis subsp. occidentalis L. R. Heckard and J. C. Hickman 1982-7-5 5915 Colusa slope below Summit Springs, S side Snow Mountain Comment
  UCD164158  Calystegia subacaulis Craig Thomsen 2000-4-28 2266 Colusa Between Bear Creek and Bear Valley Rd. about 0.3 mile north of junction with Hwy 20. Comment
  RSA261450  Camassia leichtlinii subsp. suksdorfii J. M. Tucker, L. K. Mann 1959-5-30 3531 Colusa Small lake in Mill Valley, ca. 1/4 mile northwest of Lower Letts Valley, and ca. 4 miles, airline, north of Goat Mountain Lookout 1220 Comment
  UC71985  Camissonia contorta Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  HSC83363  Camissonia graciliflora Eugene Tanimoto 1975-4-20 17 Colusa Bear Valley Rd., 8.7 mi. N of intersection with Hwy. 20 Comment
  POM271975  Camissonia graciliflora Lyman Benson 1935-3-27 6328 Colusa 8 miles E of Lake County line, inner N coast mt. range, Sacramento River watershed 305 Comment
  CDA15476  Camissoniopsis hirtella G. F. Hrusa, WTD 1998-6-19 14613 Colusa North Coast Ranges; Above upper Little Stony Creek. Goat Mtn. Rd. ~ 1.5 km. W of of campground. Comment
  CHSC112226  Camissoniopsis hirtella Lowell Ahart 2013-5-1 18671 Colusa On the east side of Bear Valley Road, about 2 1/2 miles (by road) northwest of the intersection of State Highway 20 and Bear Valley Road. 533 Comment
  CHSC70985  Camissoniopsis hirtella Vernon Oswald; Lowell Ahart 1998-5-7 9004 Colusa Bartlett Springs Rd. 2.1 mi west of Bear Valley Rd., 0.8 mi east of Sawtelle Valley and Grapevine Flat roads. 524 Comment
  UCD82382  Camissoniopsis intermedia Craig Thomsen; G. Harrington 2009-5-12 2823 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
  UCR212381  Capsella bursa-pastoris Craig D. Thomsen 2000-3-8 2037 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mi west of Hwy 20/16 intersection, milepost 3.00 310 Comment
  UCR238927  Capsella bursa-pastoris George K. Helmkamp, E. A. Helmkamp 2012-2-9 18532 Colusa Sacramento Valley, River Road, 7.1 miles north of Colusa; east side of Sacramento River 18 Comment
  CAS-BOT-BC37028  Capsella bursa-pastoris Jeanne McFarland; Kathie Meyer; Anne Mullenniex 1995-4-9 32 Colusa At intersection of Rim Road with Bear Valley Road. 350 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
  CDA6843  Carduus acanthoides G. D. Barbe, N. Palmer 1982-6-4 3639 Colusa 1.7 miles north of Pacific Ridge Forest Station, Mendocino National Forest. Comment
  CHSC79446  Carduus pycnocephalus B. Castro 2000-5-2 1112 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 231 Comment
  CHSC94984  Carex amplifolia Lowell Ahart 2006-10-31 13536 Colusa Big Springs, on the south side of Letts Lake, about 13 miles (air) southwest of Stonyford. 1529 Comment
  SEINET7556704 Image available Carex densa Lowell Ahart 2006-8-22 13213 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  CHSC92529  Carex feta G. F. Hrusa; WTD 1998-6-19 14619 Colusa Wet area on spring along Goat Mtn. Rd. below intersection with USFS Pacific Ridge Rd. (M5). 975 Comment
  RSA523879  Carex fracta Barbara Ertter 1989-7-1 8610 Colusa Road to Goat Mountain Lookout 1.7 miles S of Rt. M-10 (Bear Creek-Fouts Spring Road) at head of S Fork Stony Creek, ca. 12 airmiles WSW of Stonyford. 1463 Comment
  CAS-BOT-BC35776  Carex jonesii L. R. Heckard 1974-9-10 3913 Colusa Snow Mt.;northeast slope of West Peak 2072 Comment
  CHSC76352  Carex klamathensis L. P. Janeway; B. Castro 1999-7-5 6497 Colusa At Bear Wallow Spring; on north side of Lovelady Ridge about 0.5 mi northeast of Pacific Point. 1045 Comment
  JEPS75124  Carex lenticularis var. impressa L. R. Heckard 1972-7-8 3059 Colusa upper reaches of Dark Hollow Creek in saddle between East Peak of Snow Mt. and West Peak of Snow Mt.; Dark Hollow Creek 1981 Comment
  JEPS83819  Carex lenticularis var. impressa L. R. Heckard and J. Hickman 1980-9-16 5461 Colusa cirque area between peaks, ne slope of West Peak, Snow Mt. West Peak; Snow Mt., West Peak 2011 Comment
  JEPS75130  Carex luzulina var. luzulina L. R. Heckard 1972-7-8 3041 Colusa north side of ridge running southeast of Snow Mt., West Peak 2011 Comment
  JEPS75121  Carex luzulina var. luzulina L. R. Heckard 1972-7-10 3113 Colusa 1859 Comment
  UCD163855  Carex praegracilis Craig D. Thomsen 2001-4-12 2472 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCD61461  Carex praegracilis Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3907 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1 mile SW of parking lot. 390 Comment
  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
  CHSC94852  Carex serratodens Lowell Ahart 2006-6-11 12669 Colusa On the east side of an off road trail (Trail 30), about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford. 613 Comment
  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
  UCD67060  Carex serratodens Craig D. Thomsen 2008-3-20 2716 Colusa BLM Payne Ranch. Lands to the SW of Hwy 20/16 intersection. South side of Hwy 20, about 0.5 mile west of Hwy 16/20 intersection, at Colusa Co. milepost 2.63. 600 Comment
  UCD82514  Carex serratodens Craig Thomsen; G. Harrington 2009-5-12 2872 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  UCD82720  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
  UCD83799  Carex serratodens Craig Thomsen; G. Harrington 2009-5-14 2903 Colusa Colusa County on Walker Ridge: about 200 yds. south of spur road, 1/2 mile east of Walker Ridge Road, en route to Eaton Springs. 813 Comment
  HSC36255  Carex serratodens Steven Lagos 1974-5-4 48 Colusa 915 Comment
  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
  JEPS80860  Carex subfusca L. R. Heckard and J. C. Hickman 1981-7-30 5740 Colusa along Trout Creek trail, se side of Snow Mt. Snow Mt., Trout Creek trail 1676 Comment
  HSC72113  Castilleja applegatei subsp. martinii J. P. Smith, Jane P. Nelson, Thomas W. Nelson 1978-4-2 9557 Colusa Bear Valley Rd., 2.1 mi. from its junction with Hwy. 20 366 Comment
  JEPS39674  Castilleja applegatei subsp. martinii Rimo Bacigalupi, T. Crovello and L. Heckard 1965-4-26 9043 Colusa 1.4 mi s Wilbur Springs turnoff (along road to Bear Valley) Comment
  CHSC27516  Castilleja attenuata Michael F. Henetz 1978-4-15 6 Colusa Ca. 150 m s of Hwy 20, ca. .5 km w of Williams. S central border of Section 36. 322 Comment
  SD239905  Castilleja attenuata George K. Helmkamp, E. A. Helmkamp 2011-4-1 17122 Colusa Eastern Foothills North Coast Ranges: Antelope Valley, along Maxwell-Sites Road, 1.8 miles southeast of Sites (Sites 7.5'Q) 77 Comment
  UCD122327  Castilleja attenuata Alpaslan Ongun 1961-4-16 38 Colusa South of wooden bridge; in Bear Valley, ca. 8 miles north of State Highway 20. Comment
  CHSC60153  Castilleja exserta Bryan Case 1988-4-9 129 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
  UCR37943  Castilleja exserta Mike Malamus, P. Williams, Brian Kearney 1984-4-29 70 Colusa Bear Valley Road 2 mi north of Hwy 20 366 Comment
  UCD40887  Castilleja exserta R. Rhode 1984-4-21 s.n. Colusa 10 miles north of intersections of highways 16 and 20 in Bear Valley. 426 Comment
  UCD82329  Castilleja exserta Robin McMaster 1973-4-15 320 Colusa 10 mi NW of Rumsey. 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
  UCD64254  Castilleja exserta subsp. exserta Craig D. Thomsen 2000-3-31 2055 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
  UCR47925  Castilleja exserta subsp. exserta Eugene Tanimoto 1975-4-20 13 Colusa Bear Valley Road, 8.7 mi north of State Hwy 20 Comment
  HSC65935  Castilleja exserta subsp. exserta C. Macdonald, P. Powers, C. Raley, J. Spitler, D. Stamp 1980-4-19 45 Colusa Along Bartlett Springs Rd., .6 mi. from Jct. with Hwy. 16 Comment
  HSC85948  Castilleja exserta subsp. exserta Michalski, Raum, Hopson 1987-4-21 58 Colusa Leesville Rd. Comment
  CHSC27852  Castilleja exserta subsp. latifolia Phil Bulmert 1978-4-8 2 Colusa 5.1 mi w of Walker Ridge Rd., Hwy 20. 457 Comment
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Apr 23 2020
  CHSC115391  Castilleja foliolosa Lowell Ahart 2015-4-1 19988 Colusa Along small drainage, burned over in 2012, rocky serpentine outcrop on the north side of State Highway 20, 1/2 mile east of Lake County Line, 12 miles (air) east-northeast of Clear Lake (town), 17 miles (air) west of Williams. Inner Coast Range. 520 Comment
  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
  RSA0115084  Castilleja foliolosa Lowell A. Ahart, John Dittes, Josephine Guardino 2013-4-26 18642 Colusa On the north side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 567 Comment
  SEINET14045906  Castilleja foliolosa R. R. Halse 2011-3-25 8160 Colusa Along State Hwy. 20 just E of the Lake County Line, ca 14.6 miles E of its junction with State Hwy 53. 558 Comment
  JEPS80826  Castilleja miniata L. R. Heckard and J. C. Hickman 1981-7-31 5798 Colusa e side Snow Mt. (Dark Hollow Creek); , Dark Hollow Creek 1615 Comment
  RSA0037133  Castilleja miniata subsp. miniata David W. Isle 2013-8-23 2049 Colusa W bank Salt Ck, ~150'NE of Dennis Dr Bridge on Isle Property. 374 Comment
  UC198199  Castilleja minor subsp. spiralis Katharine Brandegee 1910-8-10 Colusa Epperson's Grade; sw Colusa Co. Comment
  UCD163343  Castilleja minor subsp. spiralis Craig D. Thomsen 2007-7-31 s.n. Colusa Walker Ridge. East of Eaton Springs en route to Rathburn Mine. Comment
  CHSC34821  Castilleja rubicundula subsp. rubicundula M. S. Taylor; E. Pierce 1981-5-17 3757 Colusa On e side of Ladoga-Stonyford Rd. 335 Comment
  JEPS124233  Castilleja rubicundula subsp. rubicundula Lowell Ahart 2015-4-1 19987 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
  RSA0118613  Castilleja rubicundula subsp. rubicundula Lowell Ahart 2013-5-1 18687 Colusa Inner North Coast Range. North of the wash and State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  UCD163871  Castilleja rubicundula subsp. rubicundula Craig D. Thomsen 2000-3-31 2132 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection. Comment
  CAS-BOT-BC40505  Caulanthus lasiophyllus Roxana S. Ferris 1926-4-22 6289 Colusa Tule land 3 miles west of Colusa. Comment
  CDA12246  Ceanothus cuneatus G. F. Hrusa 1989-2-7 5808 Colusa Inner North Coast Ranges; Leesville Road between Bear Valley & Williams. Comment
  CHSC22526  Ceanothus cuneatus Robert A. Schlising; Glenn Keator 1962-1-21 2032 Colusa Steep adobe bank and open hills. 548 Comment
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Mar 26 2014
  HSC47566  Ceanothus cuneatus J. P. Smith, J. O. Sawyer 1978-4-29 9768 Colusa Walker Ridge Rd. 3.4 mi. from its jct. with Hwy. 20 Comment
  JEPS42087  Ceanothus cuneatus var. cuneatus W. L. Jepson 1920-5-23 8964 Colusa near Leesville; SW Colusa Co., Bear Valley Comment
  UC80064  Ceanothus cuneatus var. cuneatus T. S. Brandegee Apr 1889 701 Colusa Leesville Comment
  UCD146602  Ceanothus integerrimus G. F. Hrusa 1998-6-19 14637 Colusa North Coast Ranges. On Trough Ridge Road. (To Fouts Springs, from Pacific Ridge Road.) 1200 Comment
  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
  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
  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
  HSC60452  Ceanothus jepsonii var. albiflorus J. P. Smith 1977-4-24 9036 Colusa Along Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  UCR225463  Ceanothus oliganthus var. sorediatus Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5117 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
  HSC98207  Ceanothus oliganthus var. sorediatus Steven Lagos 1974-5-4 43 Colusa 747 Comment
  UC30927  Centaurea melitensis J. Burtt Davy 1898-5-1 4288 Colusa near Princeton Comment
  UCD82113  Centaurea melitensis Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5641 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
  JEPS110383  Centaurea solstitialis Lowell Ahart 2006-8-9 13148 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  UCD57443  Centaurea solstitialis Gina Darin; with Plant Biology 102 2007-4-29 2 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central part of ranch. Thompson Canyon. Along trail, north side of Thompson Creek. 374 Comment
  UCR201558  Centaurea solstitialis George K. Helmkamp, E. A. Helmkamp 2008-10-14 14255 Colusa Sacramento Valley, along CA-20, 0.2 mile east of the Sutter County line 9 Comment
  SEINET11860767  Centaurea solstitialis C. L. Abbott 1926-6-27 s.n. Colusa Colusa Comment
  JEPS94758  Centaurium trichanthum Vernon H. Oswald and Lowell Ahart 1998-7-15 9267 B Colusa Bartlett Springs Road 1.6 mi w of Bear Valley Road 487 Comment
  UCD66949  Centromadia fitchii Ellen Dean; Davis Botanical Society 2008-5-31 4994 Colusa west of I-5 at Maxwell, along Goat Mountain Road, immediately west of the junction with Lodoga-Stonyford Road. 382 Comment
  UCD61474  Centromadia parryi subsp. parryi Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3920 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Just west of parking lot on west side of Bear Creek. 312 Comment
  UCD66917  Centromadia parryi subsp. parryi Craig D. Thomsen; G. Harrington 2008-7-6 2784 Colusa BLM Payne Ranch. Lands to the SW of the jct of Hwys 20 and 16. Near valley at the bottom of Lynch Canyon at the junction of Thompson and Lynch Creeks. Informal name for the building in the area is 'Roadkill Cafe.' Small stockpond ca. 0.2 miles to the south of Roadkill Cafe. 396 Comment
  CAS-BOT-BC271546  Centromadia parryi subsp. rudis A. A. Heller 1941-9-22 16331 Colusa Along U.S. Highway #99W between Williams and Maxwell Comment
  JEPS104140  Centromadia parryi subsp. rudis Lowell Ahart 2003-8-15 10510 Colusa On the south side of Highway 20, ca 1 mi sw of Williams. 27 Comment
  SBBG119873  Centromadia parryi subsp. rudis L. Ahart 2003-8-15 10510 Colusa S side of St Hwy 20, ca. 1 mi SW of Williams 27 Comment
  UC727676  Centromadia parryi subsp. rudis Milo S. Baker 1946-9-5 11624 Colusa 3 mi w of Colusa; Williams Comment
  CAS-BOT-BC279212  Centromadia pungens subsp. pungens David D. Keck 1933-5-30 2402 Colusa 1.8 miles west of Colusa on road to Williams Comment
  CHSC105205  Centromadia pungens subsp. septentrionalis K. R. Stern 1980-6-1 6643 Colusa Vernal pool, south central border area of Colusa National Wildlife Refuge. 45 Comment
  CAS-BOT-BC222990  Cephalanthus occidentalis Roxana Stinchfield 1916-7-8 399 Colusa Sycamore Slough, Stinchfield ranch Comment
  RSA46869  Cerastium arvense Doris K. Kildale 1927-04 3245 Colusa Stony Ford. Comment
  JEPS80442  Cerastium glomeratum L. R. Heckard and J. Hickman 1980-7-3 5372 A Colusa s.w. slope of Snow Mt. (about Summit Springs) 1554 Comment
  UCD163000  Cerastium glomeratum Craig D. Thomsen 2000-3-31 2164 Colusa Bear Creek Botanical Management Area. Roadside shoulder of Hwy 20 (south side), about 0.3 mile west of Hwy 20/16 intersection. 345 Comment
  HSC71297  Cercis occidentalis Thomas W. Nelson, Jane P. Nelson 1979-4-12 4629 Colusa Along Stony Creek below Digger Pine Campground Comment
  UCD113027  Cercocarpus betuloides G. F. Hrusa 1996-2-26 12635 Colusa Inner North Coast Ranges. E side of ridge separating Blanchard Valley from Bear Valley, on Leesville Road. 600 Comment
  UCD81859  Chaenactis glabriuscula var. heterocarpha Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5743 Colusa Walker Ridge. Along Walker Ridge Road. Lookout area with fence and view of Indian Valley Reservoir. North of turnoff to Indian Valley Reservoir and S of turnoff to picnic area. W side of road. 1061 Comment
  UC727669  Chamaesyce nutans Milo S. Baker 1946-9-4 11606 Colusa near locked gate Colusa Gun Club (Butte Sink); Butte Sink Comment
  CHSC113044  Chamaesyce serpillifolia subsp. serpillifolia Lowell Ahart 2013-10-1 19104 A Colusa Inner North Coast Range. Strand of East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  CHSC61423  Chamaesyce serpillifolia subsp. serpillifolia Vernon H. Oswald; Joseph Silveira 1993-8-16 5803 Colusa Sacramento National Wildlife Refuge. Refuge located ca. 7 mi S of Willows, center N side of Tract 44, near the S boundary of the refuge. On the N bank of Hunters Creek. 24 Comment
  JEPS120711  Chamaesyce serpillifolia subsp. serpillifolia Lowell Ahart 2013-10-1 19104 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
  CHSC39804  Cheilanthes covillei Ruby Gist 1935-5-11 Colusa Stonyford. Comment
  JEPS15549  Cheilanthes gracillima G. Thomas Robbins with L. R. Heckard 1956-7-25 3706 Colusa due s of Snow Mt East (and skirting e base of ridge forming Snow Mt West) 1981 Comment
  JEPS75724  Cheilanthes gracillima L. R. Heckard 1974-9-9 3859 Colusa ca. 1/4 mi se Foutch Camp; Snow Mt 1828 Comment
  CHSC94517  Chenopodium album Lowell Ahart 2006-8-22 13221 Colusa South side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford. 349 Comment
  JEPS110404  Chenopodium album Lowell Ahart 2006-8-22 13221 A Colusa South side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford 349 Comment
  CHSC94515  Chenopodium berlandieri Lowell Ahart 2006-8-22 13220 A Colusa South side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford. 349 Comment
  RSA718051  Chenopodium botrys L. Ahart 2006-8-9 13098 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3.5 miles (air) west of Stonyford. 455 Comment
  UCR225460  Chenopodium californicum Craig D. Thomsen 2000-4-28 2225 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
  RSA700362  Chenopodium californicum B. Castro 2003-3-18 1385 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek, in SSW-facing draw on 40 deg slope. Comment
  CHSC32207  Chenopodium hians James Jokerst 1980-8-7 1065 Colusa North Coast Range. Near Snow Mountain. Comment
  UCD168862  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
  UCD57927  Chloris gayana Beecher Crampton 1961-7-20 5932 Colusa 2 miles S of Grimes. Comment
  SEINET11696150  Chloris gayana Unknown 1961-7-20 5932 Colusa 2 mi S of Grimes Comment
  UCD37706  Chloris virgata Beecher Crampton 1961-7-20 5932 Colusa 2 miles S of Grimes. Comment
  CHSC77630  Chlorogalum pomeridianum Heidi West; Caroline Warren 1998-5-26 Colusa Vicinity of Antelope Valley, Huffmaster Road, and Sites. 152 Comment
  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
  CHSC86966  Chorizanthe membranacea B. Castro; Michelle Cedarborg 2003-5-6 1430 Colusa Vicinity of Logan Ridge, Sites Peak and Lurline Creek. 219 Comment
  CHSC86996  Chorizanthe membranacea B. Castro 2003-5-14 1433 Colusa Vicinity of Logan Ridge, Sulphur Gap and Lurline Creek. On west edge of Sacramento Valley. 134 Comment
  JEPS57654  Chorizanthe membranacea W. L. Jepson 1932-5-7 16263 Colusa valley 2 mi above Venado (western Colusa County) Comment
  CAS-BOT-BC277955  Cirsium cymosum James Jokerst 1985-4-5 2228 Colusa Near Coyote Peak 608 Comment
  SEINET3840083  Cirsium cymosum T. C. Fuller 1958-5-27 3667 Colusa south of highway 20, 1 mile west of the junction with highway 16 Comment
  UC1299440  Cirsium douglasii var. douglasii Freed W. Hoffman 1947-6-19 1669 Colusa Cooks Springs North Coast Ranges 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
  UCD81256  Cirsium vulgare Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5421 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Just north of the road leading up from the confluence of Bear and Cache Creeks. 323 Comment
  CHSC79776  Clarkia affinis L. P. Janeway; B. Castro 2000-5-3 6698 Colusa Vicinity of head of Antelope Creek, and Huffmaster Road. 335 Comment
  JEPS105670  Clarkia affinis L. P. Janeway 2002-4-24 7518 Colusa Sacramento Valley/Inner North Coast Ranges border. Vicinity of Logan Ridge, Stone Corral Creek, Funks Creek, and Golden Gate 124 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
  UCD82196  Clarkia concinna Ellen Dean; G. Harrington, C. Thomsen,R. Wilmarth,Chiao-Yi Cheng 2009-5-20 5696 Colusa Walker Ridge. Til Jones Spring area along Walker Ridge Road. 833 Comment
  CAS-BOT-BC164145  Clarkia concinna David D. Keck 1933-5-30 2401 Colusa 1 mile east of Lake County line, west of Wilbur Springs Comment
  CAS-BOT-BC164146  Clarkia concinna David D. Keck 1933-5-30 2401 Colusa 1 mile east of Lake County line, west of Wilbur Springs Comment
  CAS-BOT-BC164148  Clarkia concinna D. E. Breedlove 1963-5-30 5192 Colusa 5 miles E of Leesville Comment
  JEPS90048  Clarkia concinna subsp. concinna Dean Wm. Taylor with Glenn Clifton 1990-6-11 11222 Colusa along Goat Mountain Road 2.9 mi w from junction of Logada-Stonyford Road 0.1 mi downstream w confluence of Frenzel Creek, Little Stony Creek drainage Frenzel Creek; North Coast Ranges, Frenzel Creek Research Natural Area 441 Comment
  RSA163460  Clarkia concinna subsp. concinna Roxana S. Ferris 1926-4-23 6408 Colusa Grade beyond the Mountain House on the Williams-Stonyford Road. Comment
  UC1234600  Clarkia concinna subsp. concinna Peter H. Raven 1962-5-31 17909 Colusa 2.5 mi e Lake County line (State Highway 20) Comment
  CAS-BOT-BC164527  Clarkia gracilis subsp. albicaulis A. A. Heller 1916-6-6 12354 Colusa Coast Range on the grade about 3 miles west of Leesville Comment
  LA47307  Clarkia gracilis subsp. albicaulis Francia Chisaki; Helen Sharsmith 1959-5-27 1339 Colusa about 0.25 mi. E of Cooks Spring Comment
  UC930771  Clarkia gracilis subsp. albicaulis A. A. Heller 1916-6-6 12354 Colusa on grade about 3 mi w Leesville; Coast Range Comment
  CHSC89611  Clarkia gracilis subsp. gracilis B. Castro; Aric Lester, Shirley Innecken 2004-4-12 1445 Colusa Vicinity of Antelope Valley, Huffmaster Road, and headwaters of Lurline Creek. Near bottom of secluded E-W trending side-canyon. 176 Comment
  UC1053452  Clarkia gracilis subsp. gracilis Rimo Bacigalupi, Arthur Holmgren 1950-4-26 3169 Colusa 7.7 mi w Sites (Grapevine Grade to Lodoga) Comment
  JEPS122458  Clarkia gracilis subsp. sonomensis David Isle with F. Thomas Griggs 1979-5-23 2072 Colusa Mendocino National Forest. Goat Mtn. Road about 0.6+ mile W of junction w/ Lodoga-Stonyford Road Comment
  CDA12217  Clarkia gracilis subsp. tracyi G. F. Hrusa 1993-6-1 11165 Colusa North Coast Biodiversity Arena; Bear Valley-Bartlett Springs Rd. midway up east side of Walker ridge. Comment
  CDA15461  Clarkia gracilis subsp. tracyi G. F. Hrusa, WTD 1998-6-19 14597 Colusa North Coast Ranges; Along Little Stony Creek, on Goat Mtn. Rd. ~ 1/2 km. W of intersection with Lodoga-Stonyford Rd. Comment
  UCD63104  Clarkia gracilis subsp. tracyi Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4935 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20. 348 Comment
  CHSC79535  Clarkia modesta B. Castro; L. P. Janeway 2000-5-2 1105 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 231 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
  UCD64423  Clarkia purpurea subsp. quadrivulnera Craig D. Thomsen 2000-4-28 2180 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
  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
  HSC45676  Clarkia purpurea subsp. viminea Stephen Plant 1978-4-23 229 Colusa 1.5 mi. from Bear Valley Rd. on Barlett Springs Rd. 421 Comment
  SBBG122897  Clarkia rhomboidea B. Ertter 1989-7-1 8597 Colusa rd to Goat Mtn lookout, 2.2 mi S of Bear Crk-Fouts Spring Rd, head of S Fk of Stony Crk 1500 Comment
  UCR206290  Clarkia unguiculata George K. Helmkamp, E. A. Helmkamp 2009-5-20 14738 Colusa Central Inner Coast Ranges, along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 320 Comment
  UCD100591  Claytonia exigua K. Esau 1934-5-6 s.n. Colusa West of Williams, Tahoe-Ukiah Highway. Comment
  UC1056274  Claytonia exigua subsp. exigua Rimo Bacigalupi and Arthur Holmgren 1950-4-26 3186 Colusa just w Bear Valley (slope just w of base of the grade to Indian Valley (Bartlett Mt. Road)); Inner North Coast Ranges 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
  JEPS121109  Claytonia exigua subsp. glauca Lowell Ahart 2013-5-1 18677 Colusa On the S 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
  CDA11392  Claytonia parviflora G. F. Hrusa, K. van Katwyk 1995-4-22 12112 Colusa Inner North Coast Ranges; Approximately 7 m. N of intersection of Walker Ridge Road and Highway 20. S Comment
  UCD67063  Claytonia parviflora Craig D. Thomsen 2008-3-20 2717 Colusa BLM Payne Ranch. Lands to the SW of Hwy 20/16 intersection. South side of Hwy 20, about 0.5 mile west of Hwy 16/20 intersection, at Colusa Co. milepost 2.63. 450 Comment
  CHSC91018  Claytonia parviflora subsp. parviflora D. Isle 2002-4-18 299 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. N of Chlorinator bldg., Rd. to Bath House Trail. Comment
  HSC45739  Claytonia parviflora subsp. parviflora Sheila Logan 1978-4-22 55 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 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
  CAS-BOT-BC440035  Claytonia perfoliata subsp. perfoliata Roxana S. Ferris 1926-4-21 6311 Colusa Sycamore Slough near Sycamore Comment
  UCD146599  Claytonia saxosa G. F. Hrusa 1998-6-19 14622 Colusa North Coast Ranges. Summit of Goat Mountain. 1740 Comment
  CHSC81292  Clematis lasiantha L. P. Janeway; B. Castro 2001-4-26 7027 Colusa Vicinity of Grapevine Creek, Sites-Lodoga Road, and Scotties Canyon. 286 Comment
  SFV8355  Clematis lasiantha D. Grau 1972-4-1 4 Colusa Highway 16, 5 miles south of junction with Highway 20. Comment
  UCD95592  Clematis ligusticifolia D. Sanchez-Mata 1998-7-10 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain Road between Lodoga and Red Rock Cabin. 420 Comment
  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
  SEINET12290591  Collinsia grandiflora L. L. Pate 1978-1 83 Colusa ca 0.3 mi W of jct of Hwy 20 & 16, S side of Bear Creek, ca 18 mi SW of Williams Comment
  UCSB63619  Collinsia grandiflora Maslin, Linyi 1981-4-15 Colusa Ca. 0.5 km w of jct of Hwys 20 & 16; s side of Bear Creek; Ca. 27 km sw of Williams; Wilbur Springs Quadrangle, 15'; S central border of Sect. 36. T14N, R5W 319 Comment
  HSC86969  Collinsia heterophylla L. Blackford, S. Branch, D. Malm 1988-4-16 35 Colusa 6.1 mi. on Walker Ridge Road off Hwy 20 at Blue Oak campground 732 Comment
  UC71624  Collinsia heterophylla Miss Alice King 1905-1 Colusa College City Comment
  JEPS80140  Collinsia rattanii L. R. Heckard with J. Hickman 1980-7-2 5300 Colusa ca 10 mi w Stonyford (trail to Snow Mtn. peaks from Summit Springs); Colusa-Lake County Boudary 1661 Comment
  JEPS6657  Collinsia sparsiflora var. arvensis A. A. Heller 1937-4-24 15352 Colusa 15 m w Williams (Hwy 20) Comment
  POM253019  Collinsia sparsiflora var. arvensis A. A. Heller 1937-4-24 15352 Colusa On Highway #20, 15 miles west of Williams. 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
  CHSC86513  Collinsia sparsiflora var. collina B. Castro 2003-3-18 1384 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. Ca. 12 ft up from small drainage. 195 Comment
  UCD57622  Collinsia sparsiflora var. collina Joseph A. E. Stewart; with Plant Biology 102 2007-4-29 4 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central part of ranch. Craig Canyon. South side of unimproved road. 335 Comment
  CHSC48647  Collomia diversifolia Vernon Oswald 1986-5-12 2011 Colusa Brim Rd. (Bartlett Springs Rd.) 2.1 mi w of Bear Valley Rd. On a roadcut. 487 Comment
  CDA40008  Collomia diversifolia Vernon H. Oswald & Lowell Ahart 1998-5-7 9006 Colusa Bartlett Springs Road 2.1 miles west of Bear Valley Road, 0.8 mile east of Sawtelle Valley and Grapevine Flat roads. Comment
  CHSC13499  Convolvulus arvensis L. V. Ritter 1969-4-30 217 Colusa Ca 6 mi. sw of Williams, w side of Highway 20. Comment
  CHSC61060  Cordylanthus palmatus Vernon H. Oswald; Mike Wolder, Joe Silveria 1993-7-26 5700 Colusa Tract 18 on the S side of the refuge, ca. 1 mi W of Ohm Rd, ca. 1 mi N of Ware Rd., ca. 5 mi S of Colusa. Colusa National Wildlife Refuge. 15 Comment
  UC1561032  Cordylanthus palmatus Dean W. Taylor 1988-8-8 10024 Colusa far se corner of Colusa National Wildlife Refuge (along Ohm Rd, 1 mi n of Ware Rd.) 22 Comment
  UC496162  Cordylanthus palmatus Roxana Stinchfield 1916-7-17 284 Colusa near College City; ; near College City, Colusa Co. Comment
  SEINET10582733  Cordylanthus palmatus R. D. Stone 1987-1 Colusa Comment
  JEPS68403  Cordylanthus pilosus subsp. pilosus L. R. Heckard 1972-7-10 3147 Colusa Ladoga 487 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
  CAS-BOT-BC209738  Cornus glabrata Roxana Stinchfield 1916-7-9 413 Colusa Oak grove along Sacramento Riv., Phillips Ranch Comment
  CDA12198  Cornus glabrata G. F. Hrusa 1989-5-7 6086 Colusa North Coast Ranges; Road to Cedar Mtn., along Little Stony Creek, approx. 2.5 miles above intersection with Stonyford-Lodoga Rd. Comment
  UC1776781  Cornus glabrata G. F. Hrusa 1989-5-7 6086 Colusa North Coast Ranges; Road to Cedar Mtn., along Little Stony Creek, approx. 2.5 miles above intersection with Stonyford-Lodoga Rd. Shaded area beneath Populus fremontii 450 Comment
  UCD67592  Cornus glabrata Charles Martin 1986-5-17 30 Colusa Along Fouts Spring Rd., 2.8 miles W of Stonyford, along roadside. Growing along small stream, soil dry, in direct sunlight. Small shrub, ca. 1m tall, flowers small, white. Comment
  JEPS75756  Cornus sericea subsp. sericea L. R. Heckard and R. Bacigalupi 1976-9-6 4438 Colusa at margin of Trout Creek at trail crossing Snow Mt. 1828 Comment
  JEPS80825  Cornus sericea subsp. sericea L. R. Heckard and J. Hickman 1981-7-31 5797 Colusa e. side Snow Mt. (Dark Hollow Creek) 1584 Comment
  CHSC107950  Cotula coronopifolia B. Castro; T. Boullion 2011-4-20 1833 Colusa Sacramento Valley. Extreme W edge of Sacramento Valley; ca 5 air mi NW of Maxwell, 0.8 mi SE of Funks Reservoir and 700 ft northeast of Tehama-Colusa Canal. At north edge of large +- saline/alkaline wetland/marsh, at outer, wet edges of bald patches of bare pale soil. 49 Comment
  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
  CDA30202  Cotula coronopifolia D. Isle 2006-5-12 1628 Colusa In pre-chiseled rice field 4+ miles NE of Maxwell on W Delevan Hunting Club property farmed by W. Dirks and J. Barrett. Comment
  HSC72210  Crepis monticola Thomas W. Nelson, Jane P. Nelson 1980-6-24 5874 Colusa Colusa-Lake County line; Along trail to Snow Mtn. ca. 1/2 mi. from trailhead 1616 Comment
  POM66160  Cressa truxillensis Roxana Stinchfield 1916-7-11 143 Colusa Willaims Road at theTrough Comment
  UC572539  Cressa truxillensis H. S. Yates 1936-8-14 6133 Colusa 3 mi. s. Colusa; Colusa Quad. 15 Comment
  UCD55457  Croton setiger Ellen Dean; Gordon Harrington 2006-10-6 3281 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 374 Comment
  SACT000805  Crypsis aculeata Herbert Mason 1945-7-11 Colusa Alkali Plains three miles above Colusa Comment
  CHSC113051  Crypsis schoenoides Lowell Ahart 2013-10-1 19076 Colusa Inner North Coast Range. Strand of East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  CHSC29760  Crypsis schoenoides K. R. Stern 1980-6-30 6651 Colusa Vernal pool, south central border area of Colusa National Wildlife Refuge. 45 Comment
  CHSC94322  Crypsis schoenoides Lowell Ahart 2006-8-9 13096 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  JEPS110434  Crypsis schoenoides Lowell Ahart 2006-8-9 13116 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  POM313219  Crypsis schoenoides H. L. Mason 1945-7-11 12642 Colusa Alkali plains near Butte Creek; Butte Lodge Outing Club, three miles above Colusa Comment
  RSA757950  Crypsis schoenoides Barbara Ertter, Elizabeth Neese, Laura Fujii, Dawn Espindola 1989-10-21 8872 Colusa SE end of East Park Reservoir N of Lodoga. 366 Comment
  UC1259361  Crypsis schoenoides Barry Hammel 1976-8-5 427 Colusa e side of Hwy 45 near Colusa Golf Club 30 Comment
  UCD55460  Crypsis schoenoides Ellen Dean; Gordon Harrington 2006-10-6 3284 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 381 Comment
  UC1131372  Crypsis vaginiflora H. S. Yates 1936-8-14 6131 Colusa 3 mi s Colusa; Colusa Quadrangle 15 Comment
  UCD59987  Crypsis vaginiflora Freed W. Hoffman 1944-7-13 1966 Colusa North Coast Ranges. Bear Creek at junction of Sulphur Creek near Sulphur Springs. Comment
  UCD66926  Crypsis vaginiflora Craig D. Thomsen; G. Harrington 2008-7-6 2785 Colusa BLM Payne Ranch. Lands to the SW of the jct of Hwys 20 and 16. Western side of ranch, near ridge trail that follows the border of Colusa/Lake Counties. Dunsfield Flat stock pond. 609 Comment
  UCD56918  Cryptantha Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3521 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. In Craig Canyon. 334 Comment
  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
  RSA756835  Cryptantha affinis Barbara Ertter 1989-7-1 8615 Colusa Road to Goat Mountain Lookout 1.7 miles S of Rt. M-10 (Bear Creek-Fouts Spring Road) at head of S Fork Stony Creek, ca. 12 airmiles WSW of Stonyford. 1463 Comment
  JEPS16202  Cryptantha flaccida Rimo Bacigalupi and Arthur Holmgren 1950-4-26 3168 Colusa 8 mi nw Maxwell (along road to Sites, canyon 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
  UCR233290  Cryptantha flaccida George K. Helmkamp, E. A. Helmkamp 2011-4-1 17133 Colusa Eastern Foothills North Coast Ranges, Antelope Valley, along Maxwell-Sites Road, 0.4 miles southeast of Sites 93 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
  UC1731393  Cryptantha hispidula Dean W. Taylor 1998-6-23 16704 Colusa Walker Ridge North Coast Ranges (along access road) 929 Comment
  UCD63018  Cryptantha hispidula Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4670 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Slopes to the west of Cowboy Camp on the west side of Bear Creek. 409 Comment
  UCD82527  Cryptantha hispidula Craig Thomsen; G. Harrington 2009-5-12 2883 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. East-facing hillslope above (west border) Eaton Springs meadow complex. 722 Comment
  UCD70249  Cryptantha hispidula D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley. Destanella Flat-Walker Ridge. Annual grasslands in serpentine chaparral edges. 450 Comment
  JEPS67655  Cryptantha intermedia W. L. Jepson 1932-5-8 16291 Colusa n of Stonyford 365 Comment
  UCD63020  Cryptantha intermedia Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4672 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
  UCR80860  Cryptantha intermedia G. Fred Hrusa 1993-5-2 10865 Colusa Frenzel Creek Research Natural Area, Mendocino National Forest. Point of ridge on south side of mouth of Frenzel Creek at confluence with Little Stony Creek. 450 Comment
  RSA114163  Cryptantha intermedia H. K. Sharsmith 1953-6-19 4278 Colusa One mile north of Trough Springs on Trough Springs Ridge. Mendocino National Forest 915 Comment
  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
  UCD163839  Cryptantha intermedia var. intermedia Craig D. Thomsen 2001-4-12 2469 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UC638663  Cryptantha microstachys Ethel Crum 1938-5-7 2019 Colusa 4.2 mi n Rumsey; Inner North Coast Range, Comanche Hills 254 Comment
  UC596361  Cryptantha nemaclada R. F. Hoover 1938-4-24 3217 Colusa w of Arbuckle (Sand Creek foothills); Sand Creek Comment
  UC763256  Cryptantha nemaclada R. F. Hoover 1938-4-24 3229 Colusa ridge between Venado and Leesville Comment
  JEPS80776  Cryptantha simulans L. R. Heckard and J. Hickman 1981-7-30 5749 Colusa se side Snow Mt. (Trout Creek trail); , Trout Creek 1630 Comment
  RSA589940  Cupressus macnabiana Michael A. Vincent, Robert Rhode 1996-3-30 7307 Colusa Along Walker Ridge Road, 1.0 miles S of junction with Brim Road Comment
  UCD110851  Cupressus macnabiana Christopher Mallek 2008-1 WR- 1 Colusa Walker Ridge. Border of Colusa and Lake Counties. 802 Comment
  CAS-BOT-BC80807  Cupressus sargentii Hugh Leech 1971-10-9 s.n. Colusa [Cook's] Cooks Springs Comment
  JEPS87787  Cupressus sargentii Vernon H. Oswald and Lowell Ahart 1994-3-23 6010 Colusa s side Little Stony Creek (in section on e side of Frenzel Creek, s of Stonyford); Frenzel Creek Research Natural Area 518 Comment
  RSA17616  Cupressus sargentii C. B. Wolf, E. R. Johnson 1934-10-15 6189 Colusa Cooks Springs, western part of county 549 Comment
  CHSC115439  Cuscuta K. R. Stern 1980-5-5 6632 Colusa South central border area of Colusa National Wildlife Refuge. 45 Comment
  CHSC114931  Cuscuta approximata CDFA Staff 2011-11-5 Colusa Maxwell. Comment
  UC1116696  Cuscuta californica Beecher Crampton 1961-7-20 5935 Colusa 4 mi se Grimes (along Knight's Landing Road) Comment
  UCD81892  Cuscuta californica var. californica Ellen Dean; Bear Creek Ranch Grazing Committee 2009-6-19 5776 Colusa BLM Bear Creek (formerly Payne) Ranch. Lands to the SW of the junction of Hwys 16 and 20. SW of Roadkill Cafe near stock pond. 429 Comment
  HSC9502  Cynodon dactylon R. Spellenberg 1964-6-14 397 Colusa Colusa Comment
  UCD72464  Cynodon dactylon Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3798 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. Bank of Bear Creek near north end of bridge, west side of creek. 260 Comment
  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
  UC837462  Cyperus acuminatus Roxana Stinchfield 1916-7-11 465 Colusa Davis Tule near Sycamore Slough Comment
  CAS-BOT-BC114780  Cyperus acuminatus Herbert L. Mason; Verne Grant 1946-8-6 12969 Colusa Pond 2.7 miles N of Colusa between Sacramento River and Butte Creek. Comment
  CAS-BOT-BC114782  Cyperus acuminatus Herbert L. Mason; Verne Grant 1946-8-6 12969 Colusa Pond 2.7 miles N of Colusa between Sacramento River and Butte Creek. Comment
  JEPS110388  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
  UCD141008  Cyperus difformis John Thomas Howell 1944-7-18 19838 Colusa 3 miles west of Williams. Comment
  JEPS110331  Cyperus erythrorhizos 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
  JEPS64102  Cyperus erythrorhizos W. L. Jepson 1929-10-1 15342 Colusa Maxwell 25 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
  UC1100629  Cyperus odoratus Malcolm A. Nobs and S. Galen Smith 1949-9-9 1871 Colusa 3 mi. w. Williams Comment
  CDA38904  Cyperus odoratus G. H. True 1974-11-15 7839 Colusa On Delevan Road just west of Four Mile Road, 4 miles east of Delevan. Comment
  POM313066  Cyperus strigosus S. Galen Smith 1949-9-9 1871 Colusa Rice fields 3 miles west of Williams Comment
  UC194964  Damasonium californicum H. M. Hall 1916-8-10 10265 Colusa Colusa Sacramento Valley, Colusa Comment
  POM231094  Damasonium californicum Jens Clausen 1935-5-20 1017 Colusa Ca. 27 mi W of Williams after having passed the Wilbur Springs road. Along Bear Creek. Comment
  RSA91938  Damasonium californicum Beecher Crampton 1953-4-29 1148 Colusa 7 miles E of Maxwell. Comment
  CHSC106228  Danthonia californica var. californica B. Castro; L. P. Janeway 2001-6-3 1253 Colusa Inner North Coast Ranges. Spring near head of Doyle Canyon on east side of Walker Ridge, about 1.7 mi (air) south of Bartlett Springs Road. 798 Comment
  JEPS80385  Danthonia unispicata L. R. Heckard and J. Hickman 1981-6-22 5618 Colusa Dark Hollow Creek Snow Mt. (meadow) 1889 Comment
  CDA16113  Datisca glomerata G. F. Hrusa, Dmitri Geltman (LE) 1999-8-18 15240 Colusa North Coast Ranges; Leesville Rd. On E side of main ridge from Bear Valley. 213 Comment
  JEPS95650  Datisca glomerata Vernon H. Oswald and L. Ahart 1999-6-22 9787 Colusa 2.2 mi west of Stonyford-Lodoga Road on County Road 42 paralleling Little Stony Creek: T17N R6W Sect. 30, ca. 1400 ft, chaparral, serpentine substrate. Herbaceous perennial ca. 1 m tall on the rocky bank of Little Stony Creek. 426 Comment
  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
  RSA724817  Datura wrightii L. Ahart 2006-8-22 13205 Colusa At the intersection of Sites Lodoga Road and a dirt road to Elk Creek, about 1.5 miles (air) east of East Park Reservoir, about 4.5 miles (air) northeast of Lodoga. 546 Comment
  UC88929  Deinandra kelloggii K. Brandegee 1887-5-1 Colusa Comment
  JEPS81345  Delphinium antoninum L. R. Heckard and J. C. Hickman 1982-7-7 5957 Colusa Middle Fork of South Fork of Stony Creek Snow Mt. (originating in Veratrom Meadow before Milk Ranch) 1935 Comment
  UCD163887  Delphinium hesperium Craig D. Thomsen 2002-4-12 2439 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 1 mile west of Hwy 20/16 instersection. Comment
  CAS-BOT-BC10226  Delphinium hesperium Clinton Hart Merriam s.n. Colusa Indian Rancheria, Stony Ford Comment
  HSC85761  Delphinium hesperium R. Earing, C. Cavanaugh, C. Collins 1987-4-12 82 Colusa Leesville Rd. Comment
  CAS-BOT-BC238187  Delphinium hesperium subsp. pallescens Roman Gaukin 1958-5-4 s.n. Colusa Bear Valley Comment
  CDA11416  Delphinium hesperium subsp. pallescens G. F. Hrusa, K. van Katwyk 1995-4-22 12137 Colusa Inner North Coast Ranges; Small colony on low slope in partial shade of Quercus douglasii on S side of Leesville Rd. approx. 3 m. N of Hwy 20, flowers light purplish to near white. Rather tall-to 3 ft., most individuals just beginning bloom. Comment
  CDA15469  Delphinium hesperium subsp. pallescens G. F. Hrusa, T. D. Wilfred 1998-6-19 14606 Colusa North Coast Ranges; Scattered perennial on steep slope within chaparral above upper Little Stony Creek. Goat Mtn. Rd. ~ 1.5 km. W of of campground. Non-serpentine. Flowers blue, other plants nearby range to light blue and pinkish. Crown attachment firm. Comment
  CHSC80059  Delphinium hesperium subsp. pallescens L. P. Janeway; B. Castro 2000-5-4 6709 Colusa Vicinity of Grapevine Creek and Sites-Lodoga Road. 259 Comment
  CHSC83252  Delphinium hesperium subsp. pallescens Roman Gaukin 1958-5-4 Colusa Bear Valley. Comment
  CHSC89286  Delphinium hesperium subsp. pallescens G. F. Hrusa 1998-6-19 14606 Colusa Northern California. North Coast Ranges. Above Little Stony Creek. Goat Mtn. Rd. +- 1.5 km. W of campground. UTM: 10 S, 05356 N, 43478 E. 485 Comment
  UC1181387  Delphinium hesperium subsp. pallescens R. L. Taylor, H. G. Baker and L. Constance 1960-5-29 4421 Colusa n-facing slope 13 mi w Maxwell (on road to Lodega) Comment
  UC726271  Delphinium hesperium subsp. pallescens A. A. Heller 1940-5-6 15574 Colusa roadside bank on State Hwy #20 about 3 mi e junction with Highway #16 (<later note places locality along road from Williams to Upper Lake...a spot 3 mi e of <junction> actually is n...) Comment
  UCD163308  Delphinium hesperium subsp. pallescens Craig D. Thomsen 1997-4-20 1911 Colusa Bear Valley. About 5 miles north of Hwy 20. Comment
  UCD163698  Delphinium hesperium subsp. pallescens Craig Thomsen 1999-5-10 2004 Colusa Bear Valley. About 8 miles north of Hwy 20. Comment
  POM149761  Delphinium patens Roxana S. Ferris 1917-4-14 550 Colusa 7 miles W of Arbuckle, Arbuckle - Rumsey Road Comment
  CHSC35564  Delphinium patens subsp. patens J. P. Smith; Tom Nelson, Jane Nelson 1978-4-2 9567 Colusa Bear Valley Road, 2.1 miles from its junction with State Route 20. 365 Comment
  CAS-BOT-BC17044  Delphinium recurvatum Mrs. H. C. Cantelow 1936-4-11 1208 Colusa Bear Creek Canyon. Comment
  UC1585383  Delphinium uliginosum R. Raiche 1989-6-20 90163 Colusa near Eaton Spring (w of Williams, n of Wilbur Springs); Walker Ridge, Deadshot Flat 710 Comment
  SEINET946331  Delphinium variegatum June McCaskill 1962-1 651 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
  SFV1292  Delphinium variegatum B. J. McCaskill 1962-5-2 651 Colusa On road along Bear Creek from State Highway 20 north to Leesville. 3.6 miles north of Wilbur Springs turnoff. About 200 yards west of road. Comment
  UCR47948  Delphinium variegatum C. Pauls 1975-4-20 4 Colusa Bear Valley Rd., 8.7 mi north of State Hwy 20 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
  SEINET5718465 Image available Delphinium variegatum Robert A. Christison 1960-1 29 Colusa On State Hwy 16, ca. 3 miles from Yolo-Colusa county border. 183 Comment
  UCD14291  Delphinium variegatum L. Coats 1983-4-24 12 Colusa Colusa Co.; in the hills at the south end of Bear Valley; along Bear Valley Road, 6.3 miles south of Bartlett Springs Road; 487 Comment
  UCD14296  Delphinium variegatum G. Robinson 1984-4-21 13 Colusa Colusa Co.; Bear Valley; east of Wilbur Springs Road, 5.9 miles north of Highway 20, ca. 90 meters from road; 405 Comment
  UCD15287  Delphinium variegatum Claire Warshaw 1985-4-13 7 Colusa along Bear Valley Road, 8 miles norhtwest from intersection with highway 20; 390 Comment
  UCD18512  Delphinium variegatum Roman Gaukin 1958-5-4 s.n. Colusa Bear Valley. Comment
  UCD23391  Delphinium variegatum Robert E. Rolley 1977-5-8 23 Colusa Erect perennial herb, 10-30 cm tall, roots shallow and woody, leaves mostly basal, some are red edged. Leaves and stems covered by many short hairs. Flowers deep purple, upper petal white edged, spurred. Valley grassland. Dry, sunny, flat field. 9.5 miles north on Bear Valley Road from Highway 20. Comment
  UCD96611  Delphinium variegatum Rolf Y. Berg 1963-3-17 s.n. Colusa State Highway 16 between Cache Creek Canyon and junction with State Highway 20. Comment
  CDA11414  Delphinium variegatum subsp. variegatum G. F. Hrusa, K. van Katwyk 1995-4-22 12135 Colusa Inner North Coast Ranges; Large colony on hillslope at E base of ridge immed. E of Bear Valley, along Leesville Road. Flowers dark purple. Common, perennial, root not detaching. Comment
  UC71644  Delphinium variegatum subsp. variegatum Miss Alice King 1905-1 Colusa College City Comment
  UCD57456  Delphinium variegatum subsp. variegatum Ellen Dean; W. Murray, J. Alderson, B. Weiss, M. Starbuck 2007-4-7 3640 Colusa Payne Ranch (owned by BLM), lands just west of Hwy 16, about 2 road miles south of junction of Hwy 20 and Hwy 16. 308 Comment
  CAS-BOT-BC16954  Delphinium variegatum subsp. variegatum L. S. Rose 1936-4-27 36177 Colusa 10 mi. NW of Rumsey 213 Comment
  POM270792  Delphinium variegatum subsp. variegatum Lyman Benson 1935-3-27 6330 Colusa 8 miles E of Lake County line, inner N coast mt. range, Sacramento River watershed 305 Comment
  JEPS80431  Deschampsia cespitosa subsp. cespitosa L. R. Heckard 1974-9-9 3867 Colusa just n.e. of rocky promontory s.e. of Foutch Camp (Snow Mt.); Snow Mt. 1920 Comment
  JEPS75435  Deschampsia danthonioides W. L. Jepson 1934-5-3 16601 Colusa Stegeman sta. n. of Colusa Comment
  SD27858  Deschampsia danthonioides Carl B. Wolf 1928-5-8 2127 Colusa Sacramento Valley; 3 miles south of Arbuckle 42 Comment
  UCD163709  Deschampsia danthonioides Craig Thomsen 1999-5-10 2021 Colusa Colusa County. At confluence of Sulphur Creek and Bear Creek. About 3 miles north of Hwy 20. Comment
  UCD82860  Deschampsia danthonioides Gordon Harrington 2008-4-13 71 Colusa BLM Payne Ranch. Just SW of the Hwy 20-Hwy 16 intersection, SW of the corral. 324 Comment
  UCD62774  Deschampsia danthonioides var. gracilis A. A. Beetle 1942-5-21 3275 Colusa 12 miles north of Williams. Comment
  UC1950419  Deschampsia elongata Barbara Ertter 1989-7-1 8609 Colusa road to Goat Mt Lookout 1.7 mi S of Rt M-10 (Bear Creek-Fouts Spring Rd) at head of S Fk Stony Creek, ca 12 airmiles WSW of Stonyford; NE-facing slope Comment
  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
  UCR233440  Dichelostemma capitatum George K. Helmkamp, E. A. Helmkamp 2011-4-1 17128 Colusa Eastern Foothills North Coast Ranges, Antelope Valley, along Maxwell-Sites Road, 0.4 miles southeast of Sites 93 Comment
  CAS-BOT-BC500074  Dichelostemma capitatum Roxana S. Ferris 1917-4-12 521 Colusa 4 mi east of Williams. Alkali Plains. Comment
  CHSC58244  Dichelostemma capitatum subsp. capitatum Dave Read 1975-4-20 13 Colusa Bear Valley, 8.7 miles north of State Highway 20 on Bear Valley Road. 411 Comment
  HSC31395  Dichelostemma capitatum subsp. capitatum Maralyn O'Meara, Gary S. Lester 1974-5-4 350 Colusa Walker Ridge Rd., 0.7 mi. from junction with Little Indian Valley Rd. 854 Comment
  HSC31718  Dichelostemma capitatum subsp. capitatum Teresa Prendusi 1974-5-4 50 Colusa Beyond Clyde Mine 1/8 mi. 854 Comment
  CAS-BOT-BC503139  Dichelostemma volubile David D. Keck 1933-5-30 2400 Colusa 1 mile east of Lake County line, west of Wilbur Springs, on south slope. Comment
  CAS-BOT-BC503140  Dichelostemma volubile David D. Keck 1933-5-30 2400 Colusa 1 mile east of Lake County line, west of Wilbur Springs, on south slope. Comment
  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
  LA8596  Digitaria sanguinalis H. S. Yates; 1936-8-14 6138 Colusa 3 mi. S of Grimes 15 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
  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
  SEINET8235421  Diplacus layneae Unknown 1959-5-27 1338 Colusa by Cooks Creek; about 1/4 mile east of Cooks Spring. Comment
  SBBG119874  Distichlis spicata L. Ahart 2003-8-15 10508 Colusa S side of St Hwy 20, ca. 1 mi SW of Williams 27 Comment
  UCD61442  Distichlis spicata Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3887 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1000 ft NW of parking lot. 339 Comment
  UCD64465  Distichlis spicata var. stricta Beetle 1946-6-27 4686 Colusa Junction of Wilber Springs Rd. and State Hwy. 20. Comment
  UCD64488  Distichlis spicata var. stricta K. Esau; D. Hartmann 1941-7-17 Colusa West of Williams. Comment
  CAS-BOT-BC433232  Dodecatheon hendersonii Richard R. Halse 2014-3-25 9030 Colusa Along the Sites-Logoda Road ca. 4.7 miles northeast of Logoda; on the west end of Grapevine Pass. 527 Comment
  CHSC116063  Dodecatheon hendersonii Richard R. Halse 2014-3-25 9030 Colusa Along the Sites-Logoda Road ca. 4.7 miles northeast of Logoda; on the west end of Grapevine Pass. 527 Comment
  RSA10950  Dodecatheon hendersonii Victor Duran 1933-4-2 3378 Colusa Stonyford. 305 Comment
  UCD162980  Dodecatheon hendersonii Craig D. Thomsen 2002-2-7 2562 Colusa Bear Creek Botanical Management Area. Roadside shoulder of Hwy 20 (south side), about 1.2 miles west of Hwy 20/16 intersection, west end of large turnout. 345 Comment
  UCR70827  Dodecatheon hendersonii Victor Duran 1933-4-2 3378 Colusa Stonyford 305 Comment
  CHSC29749  Downingia bella K. R. Stern 1980-6-1 6638 Colusa Vernal pool, south central border area of Colusa National Wildlife Refuge. 45 Comment
  CHSC60732  Downingia insignis Vernon H. Oswald; Lowell Ahart 1993-5-27 5428 Colusa Sites-Logoda Rd. ca. 0.5 mi NW of Sites in the rolling, grass covered hills bordering the W side of the Sacramento Valley. 121 Comment
  CHSC83635  Downingia insignis L. P. Janeway 2002-4-25 7527 Colusa Sacramento Valley. Vicinity of Funks Creek and Tehama-Colusa Canal. Bottom of drainage. 60 Comment
  JEPS18023  Downingia insignis George B. Rossbach 1955-4-9 512 Colusa 3 mi e Maxwell; Sacramento Valley 18 Comment
  UC625519  Downingia insignis Frank W. Gould 1938-4-23 295 Colusa between Arbuckle and Williams Comment
  UCD18837  Downingia insignis Vernal Pool Team 2001; Carol Witham and Jennifer Buck 2001-4-30 144 Colusa 2 mi. south of the town of Colusa along Hwy 20, east of Hwy 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001, UTMs: 10S0587786; 4336302. Comment
  POM312375  Downingia insignis H. L. Mason 1953-4-5 14506 Colusa 3 miles east of Maxwell Comment
  JEPS73448  Drymocallis L. R. Heckard 1972-7-8 3045 Colusa on n side of ridge running se Snow Mt. (West Peak); se of Snow Mt., West Peak 2011 Comment
  UCD14239  Dudleya cymosa Ed Taub 1974-4-28 109 Colusa Colusa County; off of Bear Valley Road, about 5 miles from Highway 20; 304 Comment
  SEINET241778 Image available Echinochloa crus-galli Beecher Crampton 1965-7-8 7448 a Colusa 4.5 miles south of Grimes Comment
  JEPS47814  Echinochloa crus-pavonis W. L. Jepson 1929-10-1 15345 Colusa Maxwell Comment
  UCD61111  Echinochloa oryzicola P. B. Kennedy 30-31 May 1922 Colusa Colusa County. Comment
  UCD61166  Echinochloa oryzicola var. mutica P. B. Kennedy 1928-9-15 Colusa Rice Station, Cortena. Comment
  UCD61179  Echinochloa oryzoides Beecher Crampton 1963-9-9 6893 Colusa 1/4 mile E of Cortena. Comment
  UCD137951  Echinodorus berteroi C. F. Dunshee 1922-1 3 Colusa Cortina. Comment
  CAS-BOT-BC113366  Eleocharis engelmannii Malcom A. Nobs; Stanley Galen [S. Galen] Smith 1949-9-9 1878 Colusa Rice fields 3 miles west of Williams. Comment
  CAS-BOT-BC113365  Eleocharis engelmannii Malcom A. Nobs; Stanley Galen [S. Galen] Smith 1949-7-18 1006 Colusa West of Williams, 2.5 miles. Comment
  UCD49592  Eleocharis engelmannii S. Galen Smith; Malcolm A. Nobs 1949-7-18 1006 Colusa West of Williams, 2.5 miles, Colusa County. 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
  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
  JEPS102227  Eleocharis parishii L. P. Janeway and B. Castro 2001-6-3 7102 Colusa Inner North Coast Ranges. At Buck Flat: east side of Walker Ridge at head of Gaither Canyon; about 1.3 km south-southeast of Baldy Mountain. 872 Comment
  UC2014254  Elymus elymoides Ellen Dean, C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6067 Colusa Colusa County. On Lake County border. Walker Ridge. Along Walker Ridge Road. Buck Flat. Comment
  UCD82516  Elymus elymoides Craig Thomsen; G. Harrington 2009-5-12 2874 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  JEPS75852  Elymus elymoides subsp. elymoides L. R. Heckard 1974-9-10 3896 Colusa East Peak Snow Mt. (e slope) 2103 Comment
  JEPS80181  Elymus elymoides subsp. elymoides L. R. Heckard with J. Hickman 1980-7-3 5333 Colusa just w Summit Springs (ca 10 mi w of Stonyford, sw Snow Mt., Colusa-Lake Co. boundary); Snow Mt. 1548 Comment
  CAS-BOT-BC247093  Elymus glaucus Ellen Dean; G. Harrington; C. Thomsen; Chiao-Yi Cheng; R. Wilmarth 2009-5-20 5673 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road 869 Comment
  UCR206350  Elymus glaucus var. glaucus George K. Helmkamp, E. A. Helmkamp 2009-5-20 14743 Colusa Central Inner Coast Ranges, along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 320 Comment
  UCD62453  Elymus multisetus A. A. Heller 1916-6-6 12357 Colusa Grade about 3 miles west of Leesville. Comment
  JEPS477  Elymus trachycaulus W. L. Jepson 1938-6-9 18955 Colusa w slope of mts. between Indian Valley (Lake Co.) and Bear Valley (Colusa County) 579 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
  UC1795019  Elytrigia elongata R. K. Brummitt 1997-6-11 19696 Colusa 1 km W of Colusa on Route 20 100 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
  CHSC60744  Emmenanthe penduliflora var. penduliflora Vernon H. Oswald; Lowell Ahart 1993-5-27 5431 Colusa Sites-Lodoga Rd. ca 0.4 mi W of Grapevine Pass (4.6 road mi E of Lodoga). In loose mudstone along the road. 481 Comment
  CHSC90779  Emmenanthe penduliflora var. penduliflora D. Isle 2002-4-18 183 Colusa Mendocino National Forest--North Coast Ranges. Upper Lake Watershed. S. of Bathhouse Trail Rd. 17N51, N. of Fouts Springs. 548 Comment
  JEPS80822  Epilobium L. R. Heckard and J. C. Hickman 1981-7-31 5792 A Colusa e side of mt. Snow Mt., Dark Hollow Creek 1584 Comment
  UCD66863  Epilobium campestre Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5066 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
  UCD81376  Epilobium canum Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5403 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Just west of the mouth of canyon (inside the canyon) that is located south of Brophy Canyon. 266 Comment
  CHSC113043  Epilobium ciliatum subsp. ciliatum Lowell Ahart 2013-10-1 19101 Colusa Inner North Coast Range. Strand of East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  JEPS80784  Epilobium ciliatum subsp. ciliatum L. R. Heckard and J. C. Hickman 1981-7-30 5757 Colusa se side of mt. Snow Mt., Trout Creek 1600 Comment
  JEPS75755  Epilobium ciliatum subsp. glandulosum L. R. Heckard and R. Bacigalupi 1976-9-6 4437 Colusa trail crossing Snow Mt., Trout Creek 1828 Comment
  CHSC113048  Epilobium densiflorum Lowell Ahart 2013-10-1 19102 Colusa Inner North Coast Range. Strand of East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  JEPS110108  Epilobium densiflorum Lowell Ahart 2006-8-9 13140 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  UCD164145  Epilobium densiflorum Craig Thomsen 1997-6-21 1932 Colusa Bear Valley. About 7 miles north of Hwy 20, southern Bear Valley. Comment
  JEPS80262  Epilobium densiflorum L. R. Heckard and J. Hickman 1980-9-15 5442 Colusa n Summit Springs (n side of road, Lake-Colusa Co. boundary); Snow Mt. 1524 Comment
  JEPS86627  Epilobium foliosum L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-19 6709 Colusa 0.5 mi ne Summit Springs (sw flank of Snow Mountain, Colusa-Lake County line); Snow Mountain 1640 Comment
  CHSC27709  Epilobium minutum Tim Spira; Robert A. Schlising 1978-5-13 3232 Colusa Just E of Lake County line, along Hwy 20. Comment
  CHSC70986  Epilobium minutum Vernon Oswald; Lowell Ahart 1998-5-7 9005 Colusa Bartlett Springs Rd. 2.1 mi west of Bear Valley Rd., 0.8 mi east of Sawtelle Valley and Grapevine Flat roads. 524 Comment
  CHSC94885  Epilobium minutum Lowell Ahart 2006-6-11 12679 Colusa On the east side of an off road trail (Trail 30), about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford. 613 Comment
  UC638657  Epilobium minutum Ethel Crum 1938-5-8 2026 Colusa 3 mi n Leesville; Inner North Coast Range Comment
  CDA38115  Epilobium minutum T. C. Fuller 1958-5-27 s.n. Colusa South of Highway 20, 1 mile west of junction with Highway 16. 0 Comment
  JEPS80190  Epilobium torreyi L. R. Heckard and J. Hickman 1980-7-3 5341 Colusa just w Summit Springs (ca 10 mi w of Stonyford, Colusa-Lake Co. boundary); southwest Snow Mt. 1548 Comment
  CHSC94512  Equisetum laevigatum Lowell Ahart 2006-8-22 13210 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  RSA724896  Equisetum laevigatum L. Ahart 2006-8-22 13210 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
  RSA724897  Equisetum telmateia var. braunii L. Ahart 2006-8-22 13211 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
  CAS-BOT-BC213552  Eragrostis hypnoides Roxana Stinchfield 1916-7-8 383 Colusa In bed of Sycamore Slough. Comment
  SEINET200142 Image available Eragrostis hypnoides Herbert L. Mason 1945-9-19 12717 Colusa Below causway over Butte Sink spillway east bank of Sacramento River 1 mile above Colusa Comment
  UC1950146  Eragrostis hypnoides Barbara Ertter with Elizabeth Neese, Laura Fujii, Dawn Espindola 1989-10-21 8878 Colusa NW side of East Park Reservoir near end of East Park Road from Stonyford Comment
  CHSC115633  Eragrostis hypnoides David Isle; Terril Wolt 2014-9-24 2139 Colusa Northern Sacramento Valley Foothills: W side East Park Reservoir, ~0.3 mi S of boatlaunch, ~ 100 yds E of normal lake edge in muddy clay soil. (Gilmore Peak California: 10S -0541629E, 4355225N). 353 Comment
  JEPS127604  Eragrostis hypnoides David Isle with Rhonda Isle 2014-9-27 2143 Colusa W side of East Park Reservoir, ca 0.3 miles S of boat launch, ca 100 yards E of normal lake edge. Comment
  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
  UCR261669  Eriastrum abramsii Ann Howald 2003-5-29 2343 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3.7 miles north of Lodoga, near Chisolm Cove Group Campground 378 Comment
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Dec 15 2016
  UCR261751  Eriastrum abramsii Ann Howald 2003-5-29 2350 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3.7 miles north of Lodoga, near Chisolm Cove Group Campground 378 Comment
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Dec 15 2016
  CHSC92674  Eriastrum brandegeeae David Toren 2002-6-19 1241 Colusa Mendocino National Forest - North Coast Ranges Middle Fork Stony Creek Watershed. Auk Auk Ridge in 2001 Trough Fire Area. 731 Comment
  JEPS31350  Ericameria linearifolia W. L. Jepson 1932-5-9 16294 Colusa n of Stonyford 365 Comment
  RSA293106  Ericameria linearifolia Thomas W. Nelson, Jane P. Nelson 1978-4-1 9527 Colusa Walker Ridge Road, 3.2 miles from its junction with State Route 20 Comment
  RSA589927  Ericameria linearifolia Michael A. Vincent, Robert Rhode 1996-3-30 7310 Colusa Along Walker Ridge Road, 11.5 miles S of junction with Brim Road Comment
  SEINET4208167  Ericameria linearifolia Richard R. Halse 2013-3-26 8742 Colusa Along the Leesville-Logoda Road ca. 5.5 miles south of Logoda, or 3.2 miles north of the junction of the Leesville and Bear Valley Roads; Indian Valley.; 0 426 Comment
  UCD163349  Ericameria linearifolia Craig D. Thomsen 2000-5-12 2329 Colusa Walker Ridge. Along road to Elgin Mine. Comment
  UCD84637  Erigeron greenei G. Harrington 2009-7-21 86 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones spring area on W side of road. Ca 6.5 road miles N of junction with Hwy 20. W side of road. 833 Comment
  JEPS80754  Erigeron inornatus var. inornatus L. R. Heckard and J. C. Hickman 1981-7-29 5721 Colusa Spur, about .75 km se Summit Springs; Snow Mt., Summit Springs 1554 Comment
  RSA401486B  Eriodictyon californicum Carolyn Sanford 1977-4-24 s.n. Colusa Dry hillsides along Walker Ridge Road above Barrel Springs Campground. 701 Comment
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Jul 31 2014
  UCD58169  Eriodictyon californicum Gordon Harrington 2007-5-15 59 Colusa BLM Payne Ranch. Sandy north side of Cache Creek, about 1/2 mile upstream from the confluence of Cache Creek and Bear Creek. 190 Comment
  UCR206378  Eriodictyon californicum George K. Helmkamp, E. A. Helmkamp 2009-5-20 14759 Colusa Inner North Coast Ranges, along CA-16, 1.8 miles north of the Yolo County line 271 Comment
  CAS-BOT-BC242579  Eriogonum dasyanthemum James L. Reveal 1988-6-2 6986 Colusa Walker Ridge Road along the Lake County line, 4.1 miles south of the Bartlett Springs Road and 3.2 miles south of the northern turnoff to Barrel Springs Campground, about 12.7 miles north of California Highway 20 990 Comment
  JEPS57027  Eriogonum dasyanthemum W. L. Jepson 1920-5-23 8962 Colusa grade above Venado Comment
  POM279914  Eriogonum dasyanthemum Lyman Benson 1933-6-26 4489 Colusa Abbott mine. 549 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
  UCD13221  Eriogonum dasyanthemum Charles Martin 1986-5-17 28 Colusa California: Colusa Co. Along Sites-Lodoga Rd, 8.2 mi W of Sites. Comment
  UCD163236  Eriogonum dasyanthemum Craig D. Thomsen 2000-6-7 2362 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 1 mile west of Hwy 20/16 intersection. 345 Comment
  UCD63122  Eriogonum dasyanthemum Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4952 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20. 405 Comment
  UCR44922  Eriogonum dasyanthemum L. F. LaPre 1986-5-30 s.n. Colusa 1.5 mi west of Mendocino National Forest Boundary on Stony Creek Rd [c. 4 mi. west of Stonyford] 671 Comment
  CDA22487  Eriogonum dasyanthemum D. Brown 1973-10-19 Colusa Sand Creek, ca. 6 miles west of Arbuckle. 0 Comment
  RSA0081456  Eriogonum dasyanthemum James L. Reveal 1988-6-2 6986 Colusa Walker Ridge Road along Lake County line, 4.1 miles south of the Bartlett Springs Road and 3.2 miles south of the northern turnoff to Barrel Springs Campground, about 12.7 miles north of California Highway 20. 991 Comment
  CAS-BOT-BC259384  Eriogonum luteolum P. C. Everett; E. K. Balls 1954-10-17 20336 Colusa West slope Goat Mt., 0.9 mi. s.w. from Linger Longer campsite; road from Stonyford to Upper Lake 1828 Comment
  RSA96804  Eriogonum luteolum Percy C. Everett, E. K. Balls 1954-10-17 20336 Colusa West slope Goat Mt., 0.9 mile SW from Linger Longer campsite; road from Stonyford to Upper Lake 1829 Comment
  CDA15552  Eriogonum nudum var. nudum G. F. Hrusa 1998-10-28 14903 Colusa North Coast Ranges; Cedar Camp Rd. as it enters Little Stony Ck. Cyn., approx. 1 mi. from Lodoga/Stonyford Rd. Comment
  CAS-BOT-BC269821  Eriogonum nudum var. pubiflorum Mark A. Elvin; Mark S. Brunell; David Isle 2006-8-3 5031 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
  RSA7561  Eriogonum prattenianum Carl B. Wolf 1933-9-25 5497 Colusa 2 mi. W of Grass Valley on rd. to Rough and Ready. West slope of Sierra Nevada. Comment
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Oct 30 2012
  JEPS75856  Eriogonum spergulinum var. reddingianum L. R. Heckard 1974-9-10 3894 Colusa e ridge of East Peak, Snow Mt. Snow Mt. 2042 Comment
  CHSC32206  Eriogonum strictum var. greenei James Jokerst 1980-8-8 1077 Colusa North Coast Ranges. Near Snow Mountain (west). Comment
  CAS-BOT-BC267476  Eriogonum umbellatum Mark A. Elvin; Mark S. Brunell; David Isle 2006-8-3 5032 Colusa Southern Northern Inner Coast Ranges: Snow Mtn; Summit Spring Trail; 1.4km W of Snow Mtn West summit; 800m N of Cedar Camp 1989 Comment
  CDA1339  Eriogonum umbellatum var. bahiiforme D. Isle 2005-8-1 1155 Colusa 1/3 mi S of Goat Mountain Lookout. Comment
  SEINET7096744  Eriophyllum lanatum A. G. Vestal 1955-4-5 3673 Colusa Steep south of facing bank ca. 1/3 mile into Colusa National Wildlife Refuge on Route 20.NAD27, 39? deg. 09' 09ao, -122?_ 11ao (converted to WGS84 decimal degrees) UTM Zone 10, 570301mE, 4333799mN. Comment
  UCD57823  Eriophyllum lanatum Gordon Harrington 2007-4-17 34 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Destanella Flat, just south of Hwy 20, approximately 3.4 road miles west of the Hwy 16 intersection. 526 Comment
  CDA15503  Eriophyllum lanatum var. achilleoides G. F. Hrusa, WTD 1998-6-19 14640 Colusa North Coast Ranges; Trough Springs ridge, immed. above (overlooking settlement) Fouts Springs. Comment
  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
  HSC44471  Eriophyllum lanatum var. achilleoides R. York 1978-4-22 132 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  JEPS75857  Eriophyllum lanatum var. achilleoides L. R. Heckard 1974-9-10 3893 Colusa along upper reaches of Dark Hollow Creek (s of East Peak); Snow Mt., Dark Hollow Creek 2042 Comment
  SD53217  Eriophyllum lanatum var. achilleoides Darley F. Howe 1962-5-19 3283 Colusa 20 miles west of Williams 395 Comment
  UC1484434  Eriophyllum lanatum var. achilleoides Dale E. Johnson with J. E. Eckenwalder 1974-6-2 128 Colusa On ridge connecting East and West peaks of Snow Mt. 1999 Comment
  POM163461  Eriophyllum lanatum var. grandiflorum Roxana S. Ferris 1926-4-23 6411 Colusa Grade beyond the Mountain House on the Williams-Stonyford Road. Comment
  UCD70241  Eriophyllum lanatum var. grandiflorum D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley. Destanella Flat-Walker Ridge. 450 Comment
  SEINET11850784  Eriophyllum staechadifolium C. L. Abbott 1926-1 s.n. Colusa Colusa Comment
  UCD66935  Erodium brachycarpum Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5085 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. 628 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
  UC17103  Erodium moschatum J. Burtt Davy May 1898 4282 Colusa near Willows Comment
  CAS-BOT-BC211070  Eryngium Roxana Stinchfield 1916-7-9 404 Colusa Along Sacramento River near Sycamore Comment
  UCD82579  Eryngium aristulatum Craig Thomsen 2008-6-12 2769 Colusa Bear Creek (formerly Payne) Ranch. South side of Hwy 20, ca. 0.25 mi W of Hwy 16. West and SW of the corral that is located at the junction of Hwy 16 and 20. Comment
  UC21016  Eryngium aristulatum var. aristulatum J. Burtt Davy 1898-5-1 4300 Colusa near Willows Comment
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Sep 15 2014
  UC660108  Eryngium aristulatum var. aristulatum Milo S. Baker 1941-7-8 10110 Colusa s. Stony Ford (Valley along Bear Creek); Valley along Bear Creek Comment
  UCD61476  Eryngium aristulatum var. aristulatum Gordon Harrington 2007-6-29 70 Colusa BLM Payne Ranch. Just west of the Hwy 20-Hwy 16 intersection, about 300 feet uphill to the west of the corral. 326 Comment
  CDA38319  Eryngium castrense Kingwell 1930-5-2 s.n. Colusa [no additional data] 0 Comment
  CAS-BOT-BC40754  Erysimum capitatum G. B. Rossbach; R. P. Rossbach 1938-5-31 851 Colusa About 18 miles west of Williams. Comment
  SEINET233343  Erysimum capitatum Kathleen R. Robson 1981-5-2 33 Colusa Mendocino National Forest ; Colusa co.: From Stonyford take Fouts Springs Road 12mi W past Fouts Springs to Letts Lake 1219 Comment
  SEINET9356866  Erysimum capitatum Unknown 1993-5-2 10856 Colusa Common on open, dry, S facing slopes at mouth of Frenzel Creek, tributary of Little Stony Creek. Comment
  JEPS86638  Erysimum capitatum var. capitatum L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-18 6684 Colusa along trail from Frog Pond to East Peak; Snow Mtn. 1875 Comment
  POM143091  Erysimum capitatum var. capitatum Roxana S. Ferris 1917-4-14 576 Colusa 7 miles W of Arbuckle, Arbuckle - Rumsey Road Comment
  JEPS120998  Erysimum cheiranthoides Lowell Ahart 2013-5-1 18665 Colusa On the E side of Bear Valley Road, about 2.5 road miles NW of intersection of Hwy 20 and Bear Valley Road. Comment
  CHSC27633  Erythranthe nudata Tim Spira; Rober Schlising 1978-5-13 3236 Colusa Just E of Lake County line, along Hwy 20. Comment
  UCR206723  Eschscholzia George K. Helmkamp, E. A. Helmkamp 2009-3-17 14393 Colusa Inner North Coast Ranges Foothills, along CA-16 and Bear Creek, 7.0 miles south of the junction with CA-20; just north of the Yolo County line 194 Comment
  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
  HSC45679  Eschscholzia caespitosa Catherine Chin 1978-4-22 26 Colusa Bear Valley Rd., 1.5 miles from its junction with State Rte. 20 412 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
  CAS-BOT-BC5882  Eschscholzia caespitosa Townsend Stith Brandegee 1889-4-1 s.n. Colusa unspecified Comment
  RSA388342  Eschscholzia caespitosa subsp. caespitosa Harold Grams 1975-4-12 5 Colusa State Highway 16, 16 miles north of Rumsey Comment
  JEPS80217  Eschscholzia californica L. R. Heckard and J. Hickman 1980-7-3 5373 Colusa above Summit Springs (sw slope of mt.); Snow Mt. 1554 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-BC402977  Eschscholzia californica A. A. Heller 1919-5-10 13115 Colusa Valley west of Leesville Comment
  CAS-BOT-BC5885  Eschscholzia californica Townsend Stith Brandegee 1889-4-1 s.n. Colusa unspecified Comment
  HSC48045  Eschscholzia lobbii Thomas W. Nelson, Jane P. Nelson 1978-4-29 3937 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  CHSC115331  Euphorbia crenulata Lowell Ahart 2015-4-10 20011 Colusa In a small meadow, on the south side of Brim Road, about 2 miles west of the intersection of Bear Valley Road and Brim Road, about 17 miles (air) west of Williams. 500 Comment
  UCD163848  Euphorbia crenulata Craig D. Thomsen 2000-5-30 2275 b Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  CHSC112255  Euphorbia spathulata Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18645 Colusa Inner North Coast Range. On the north side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  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
  JEPS94662  Euphorbia spathulata Vernon Oswald and Lowell Ahart 1998-5-7 Colusa Bartlett Springs Rd. 2.1 mi w Bear Valley Rd. (0.8 mi e of Sawtelle Valley and Grapevine Flat roads) 524 Comment
  UCD66873  Euphorbia spathulata Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5076 Colusa BLM Payne Ranch. Lands to the southwest of the intersection of Hwy 16 and Hwy 20. Northwest corner of ranch. Along ridge trail on the border of Lake and Colusa counties. South of junction with trail that heads down to the headwaters of Thompson Creek, upslope of very large stock pond. 629 Comment
  UCD81254  Euthamia occidentalis Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5419 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Just north of the road leading up from the confluence of Bear and Cache Creeks. 312 Comment
  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
  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
  JEPS121258  Festuca microstachys var. ciliata Lowell Ahart 2013-5-1 18689 Colusa N of the wash and 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
  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
  CAS-BOT-BC77677  Ficus carica J. H. Thomas 1960-8-30 8867 Colusa Edge of College City Comment
  UCD63871  Forestiera pubescens Craig D. Thomsen 2008-5-31 2758 Colusa BLM Payne Ranch. Lands to the southwest of the intersection of Hwys 16 and 20. Cowboy Camp area on the west side of Hwy 16, 1 mile south of Hwy 20. 0.25 mile west of public viewing area and Bear Creek. 285 Comment
  UCD72474  Forestiera pubescens Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3808 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 south end of bridge, east side of creek. 252 Comment
  SEINET7417537 Image available Frangula californica A. A. Heller 1916-1 12359 Colusa Coast Range; ca. 3 mi W of Leesville Comment
  HSC48195  Frangula californica subsp. californica Thomas W. Nelson, Jane P. Nelson 1978-4-29 3961 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  LA207661  Frangula californica subsp. crassifolia A. A. Heller; 1916-6-6 12359 Colusa on grade ca 3 mi W of Leesville Comment
  HSC48172  Frangula californica subsp. tomentella Thomas W. Nelson, Jane P. Nelson 1978-4-29 3936 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  UCD163874  Frangula californica subsp. tomentella Craig D. Thomsen 2000-5-11 2395 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 1 mile west of Hwy 20/16 instersection. Comment
  CHSC107939  Frankenia salina B. Castro; Joe Silveira, Tom Boullion 2011-6-10 1886 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; approximately 1 mi southeast of Funks Reservoir and 0.2 mi northeast of Tehama-Colusa Canal. In swale about 400 ft north of large +- alkaline marsh; off edges of whitish alkali bald. 49 Comment
  CHSC46874  Frankenia salina Vernon Oswald 1989-9-12 4011 Colusa Maxwell-Colusa Rd 1.9 mi e of Maxwell, just w of Two-Mile Rd. On upper bank of roadside ditch. 33 Comment
  POM135670  Frankenia salina Roxana Stinchfield 1916-7-11 120 Colusa Colusa - Williams Road at 'Trough' Comment
  RSA123211  Frankenia salina H. S. Yates 1936-8-14 6135 Colusa 3 miles S. of Colusa 15 Comment
  CAS-BOT-BC223368  Fraxinus dipetala Mrs. H. C. Cantelow 1936-4-11 1193 Colusa Bear Creek Comment
  SBBG115358  Fraxinus dipetala D. Sanchez-Mata 1998-6-24 Colusa Bear Valley, Bear Valley Rd, Bear Valley Crk 450 Comment
  UC1051743  Fraxinus dipetala Helen K. Sharsmith 1953-6-20 4299 Colusa Little Stoney Creek Inner North Coast Ranges, Mendocino National Forest 762 Comment
  UCD15699  Fraxinus dipetala Sook Hong 1989-4-8 7 Colusa Bear Valley. 670 Comment
  UCD57451  Fraxinus dipetala Gina Darin; with Plant Biology 102 2007-4-29 6 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central part of ranch. Thompson Canyon. Along trail, north side of Thompson Creek. 377 Comment
  UCD67670  Fraxinus dipetala D. Sanchez-Mata 1996-6-20 s.n. Colusa Williams. Blue Ridge. Bear Valley. Bear Creek. 350 Comment
  CAS-BOT-BC223489  Fraxinus latifolia Roxana Stinchfield 1916-7-8 391 Colusa Sycamore Slough Comment
  UCD139660  Fritillaria agrestis S. W. Winter 1927-3-9 751 Colusa Arbuckle. Comment
  CAS-BOT-BC130330  Fritillaria glauca Greg de Nevers; S. Charnley 1995-5-27 10734 Colusa Snow Mountain 2133 Comment
  JEPS81409  Fritillaria glauca L. R. Heckard and J. C. Hickman 1982-7-9 6016 Colusa near junction of Horse Glade along road to Lookout, Goat Mountain Goat Mountain 1737 Comment
  CAS-BOT-BC130431  Fritillaria pluriflora Barbara Menzies; Arthur Menzies 1967-3-18 s.n. Colusa 10 mi. north of Highway 20 (Bear Valley), 5 mi. north of Wilbur Springs cut-off Comment
  CAS-BOT-BC130433  Fritillaria pluriflora James Jokerst 1985-4-10 2229 Colusa Near Walker Ridge Comment
  CAS-BOT-BC130437  Fritillaria pluriflora Arthur Menzies; Barbara Menzies 1968-3-22 s.n. Colusa Bear Valley (Between Wilbur Springs & Leesville) 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
  HSC33041  Fritillaria pluriflora Thomas W. Nelson, James Nelson 1975-3-26 1772 Colusa Beside rd. to Bear Valley 7 mi. N of junction with Hwy. 20 Comment
  RSA481919  Fritillaria pluriflora Aaron Liston 1988-3-16 700 -1 Colusa Bear Valley 400 Comment
  UC1179069  Fritillaria pluriflora Herbert L. Mason 1947-3-30 13165 Colusa 0.5 mi e of Lake County Line (on Williams-Lower Lake Highway, western Colusa County); Williams-Lower Lake Highway Comment
  UCR261613  Fritillaria pluriflora Ann Howald 2003-3-12 2279 Colusa Inner North Coast Ranges, Indian Valley, west side of East Park Reservoir, c. 2 miles southeast of Stonyford 379 Comment
  UCR261676  Fritillaria pluriflora Ann Howald 2003-3-25 2283 Colusa Inner North Coast Ranges, Indian Valley, west side of East Park Reservoir, c. 1.5 miles southeast of Stonyford, just south of cattle guard at entrance to recreation area 364 Comment
  SEINET10469567  Fritillaria pluriflora Mary Susan Taylor, J. Lacey 1982-4-14 Taylor 4344 Colusa In deep adobe clay, both sides of Stonyford Cemetary Lane, ca. 1.5 mi w of Stonyford, s of Fouts Springs Rd. 1200 ft. 365 Comment
  JEPS15271  Fritillaria purdyi Rimo Bacigalupi with G. L. Stebbins, C. McMillan and Peter Kamb 1950-4-16 3107 Colusa between and above confluence of the North and Middle Forks of Stony Creek, very close to Glenn Co. line, above and n of Red Bridge Camp [Mend. Nat. Forest] Stony Creek; innermost ridges of Inner North Coast Ranges 579 Comment
  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
  JEPS80799  Galium andrewsii subsp. andrewsii L. R. Heckard and J. C. Hickman 1981-7-30 5769 Colusa about 100 ft above on n side Trout Creek (se side of mt); Snow Mt. 1554 Comment
  CDA42141  Galium andrewsii subsp. andrewsii T. C. Fuller 1958-5-27 Colusa South of Highway 20, 1 mile west of junction with Highway 16. 0 Comment
  JEPS95487  Galium aparine Vernon H. Oswald and L. Ahart 1994-4-6 6062 Colusa T17N R7W SE1/4 SW1/4 Sec. 36, 1540 ft, Chaparral. Goat Mtn. Rd. at Sullivan Creek, 1.2 mi SW of Digger Pine Flat, S of Stonyford 469 Comment
  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
  UCR212308  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 mi west of Hwy 20/16 intersection, milepost 3.00 310 Comment
  UCD121724  Galium aparine William Pyott 1962-4-28 23 Colusa West of road in Bear Valley. Comment
  JEPS80054  Galium bifolium L. R. Heckard with J. Hickman 1979-6-15 5054 Colusa e trail from Frog Pond (cirque between e and w peaks); Snow Mt. 1981 Comment
  CDA14919  Galium bolanderi G. F. Hrusa 1993-5-2 10860 Colusa North Coast Ranges; Frenzel Creek Research Natural Area. Mendocino National Forest. Mid-canyon of Frenzel Creek. Comment
  UC1229763  Galium bolanderi Francia Chisaki and Helen K. Sharsmith 1959-5-27 1335 Colusa at Mill Creek Crossing (road leading out of Red Bridge camp) Comment
  OBI78460  Galium bolanderi Helen K. Sharsmith & Francia Chisaki, Francia Chisaki 1959-5-27 1335 Colusa At Mill Crk crossing on rd leading out of Red Bridge Camp Comment
  JEPS24234  Galium grayanum var. nanum Peter H. Raven, R. Snow 1959-9-11 14411 Colusa s shoulder Snow Mountain 2042 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
  JEPS88931  Galium grayanum var. nanum Milo S. Baker 1929-7-1 3516 b Colusa near top Snow Mt. 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
  RSA725011  Galium parisiense L. Ahart 2006-8-9 13149 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
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Aug 9 2017
  UCD64440  Galium parisiense Craig D. Thomsen 2000-3-31 2080 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCD66950  Galium parisiense Ellen Dean; Davis Botanical Society 2008-5-31 4995 Colusa west of I-5 at Maxwell, along Goat Mountain Road, immediately west of the junction with Lodoga-Stonyford Road. 382 Comment
  UCD163913  Galium porrigens var. porrigens Sara Martin 2016-4-9 5 Colusa BLM Bear Creek Ranch (Previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. Hill to the south of corral at junction of 16 and 20. 464 Comment
  UCR227343  Galium porrigens var. tenue Craig D. Thomsen 2001-5-24 2457 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, south side of Hwy 20, c. 0.5 mi west of Hwy 20/16 intersection (between mileposts 2.17 and 2.63) 325 Comment
  POM96840  Galium tricornutum E. Johnson 1926-5-5 s.n. Colusa [Unspecified] Comment
  CDA12373  Garrya congdonii G. F. Hrusa 1996-1-2 12626 Colusa Inner North Coast Ranges; N side of Little Stony Creek, about 2 miles W of intersection of Cedar Camp Rd. and Stonyford-Lodoga Rd. Comment
  SBBG34146  Garrya congdonii R. D. Slayback 1959-3-20 2 Colusa near St Hwy 16, 6 mi NW of Rumsey Comment
  SBBG5330  Garrya congdonii H. and M. Dearing 1939-5-12 3331 A Colusa near Leesville 457 Comment
  SDSU7189  Garrya congdonii D. F. Howe 1962-5-19 3280 Colusa 20 miles west of Williams on #20. Comment
  UCD56678  Garrya congdonii Jack Alderson 2007-3-25 14 Colusa BLM Payne Ranch. Destinella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 570 Comment
  RSA201851  Garrya flavescens subsp. congdonii Robert D. Slayback 1959-3-20 2 Colusa Near State Highway 16, six miles northwest of Rumsey. Comment
  JEPS80143  Gayophytum diffusum subsp. diffusum L. R. Heckard with J. Hickman 1980-7-2 5304 Colusa trail from Summit Springs to Snow Mt. Peaks ((ca 10 mi w of Stonyford), Colusa-Lake Co. boundary) 1676 Comment
  JEPS75848  Gayophytum heterozygum L. R. Heckard 1974-9-11 3941 Colusa near upper crossing of Trout Creek (e of Foutch Camp); Snow Mt. 1859 Comment
  CHSC101434  Geranium dissectum David Isle 2007-5-1 1575 Colusa SE of Maxwell approx. 4 miles in riparian natural area just W of irrigation canal adjacent to 'Lakeland' rice fields farmed by William Dirks and Jack Barrett. W of footbridge S of third landing. 30 Comment
  SBBG61312  Geranium dissectum G. K. Helmkamp with E. A. Helmkamp 2011-4-1 17117 Colusa Maxwell Rd, 2.1 mi E of Maxwell, near Delevan Wildlife Refuge 23 Comment
  JEPS95997  Geum macrophyllum Vernon H. Oswald and Lowell Ahart 1999-6-22 9781 Colusa W of Stonyford ( Lily Pond near Upper Letts Lake) Comment
  UC1614400  Gilia Charles M. Belshaw 1937-4-25 2855 Colusa vicinity Cook's Spring (Devil's Ridge); Inner North Coast Range, Devil's Ridge Comment
  RSA0014386  Gilia capitata Joan Stewart 1998-6-10 757 Colusa Bear Valley Comment
  UC1613303  Gilia capitata Charles M. Belshaw April, 1937 2870 Colusa Inner North Coast Range. Vicinity of Cook's Spring, Devil's Ridge. Comment
  HSC45725  Gilia tricolor Patricia Shesgreen 1978-4-22 49 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  POM163453  Gilia tricolor Roxana S. Ferris 1926-4-23 6403 Colusa Grade beyond the Mountain House on the Williams-Stonyford Road. Comment
  RSA590190  Gilia tricolor Michael A. Vincent, Robert M. Rhode 1996-3-30 7283 Colusa Along Bear Valley Rd. above Bear Creek, 1.4 mi. S jct. Wilbur Springs Rd. Comment
  SEINET5732135 Image available Gilia tricolor J. Maze 1971-1 869 Colusa About 1 mile from Stony Ford on road to East Gorge Reservoir.; Stony Ford Comment
  RSA523935  Glinus lotoides Barbara Ertter, E. Neese, Laura Fujii, Dawn Espindola 1989-10-21 8871 Colusa SE end of East Park Reservoir N of Lodoga. 366 Comment
  UCR225394  Gnaphalium californicum Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5099 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20. Western part of ranch along ridge trail at Cache Creek Canyon, just south of junction with trail that leads east to Brophy Canyon and Thompson Creek 495 Comment
  CAS-BOT-BC303890  Gnaphalium palustre Roxana Stinchfield 1916-7-9 409 Colusa Phillips Ranch Comment
  POM53845  Grindelia camporum Roxana Stinchfield 1916-6-17 283 Colusa Near Tule - College City. Comment
  RSA724829  Grindelia camporum L. Ahart 2006-9-26 13345 Colusa Between the deep ditch and the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5.5 miles east of Maxwell. 24 Comment
  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
  CAS-BOT-BC305305  Grindelia hirsutula Roxana Stinchfield 1916-6-17 283 Colusa College City Comment
  UC71783  Grindelia hirsutula H. P. Chandler 1905-9-14 Colusa Princeton Comment
  CHSC97316  Grindelia hirsutula var. davyi L. P. Janeway 2007-6-17 9059 Colusa Inner North Coast Ranges. Along Bear Valley Road and Bear Creek near Hwy 20. 325 Comment
  CHSC97317  Grindelia hirsutula var. davyi L. P. Janeway 2007-6-17 9058 Colusa Inner North Coast Ranges. Along Bartlett Springs Road between Bear Valley and Walker Ridge Road. 530 Comment
  RSA0016943  Grindelia hirsutula var. davyi C. B. Wolf 1928-5-8 2126 Colusa 3 miles S of Arbuckle, Pacific Hwy. Comment
  POM143400  Guillenia lasiophylla M. Alice King 1905-1 s.n. Colusa Sacramento Valley. Near College City. Comment
  JEPS81334  Hackelia amethystina L. R. Heckard and J. C. Hickman 1982-7-6 5948 Colusa s side of Snow Mountain (western edge of West Peak Ridge); , West Peak Ridge Comment
  CHSC112271  Hainardia cylindrica Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18638 Colusa Inner North Coast Range. North side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  CHSC86780  Hainardia cylindrica Jenny Marr; Heidi West, Caroline Warren, Natalie Wight 1998-6-11 Colusa Vicinity of Funks Creek, Logan Ridge, Golden Gate, and Antelope Valley. 121 Comment
  JEPS96685  Harmonia hallii Dean W. Taylor 1998-6-23 16703 Colusa Walker Ridge, along BLM access road 929 Comment
  UCD135766  Harmonia hallii Bruce G. Baldwin 1986-4-13 599 Colusa 2.6 miles west of junction with Bear Valley Road along Bartlett Springs Road. Comment
  UCD82590  Harmonia hallii Craig D. Thomsen; J. Wiegand, S. Harrison, G. Harrington, A. Fulks 2008-4-22 2735 Colusa Walker Ridge. About 3.2 mi N of Hwy 20, adjacent to abandoned road leading back to Walker Ridge Rd. from 'Oak Cove. 822 Comment
  CAS-BOT-BC309382  Helenium puberulum Volney Rattan 1877-6-26 s.n. Colusa Sulphur Creek Comment
  CHSC94313  Helianthus bolanderi Lowell Ahart 2006-8-9 13097 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  JEPS30444  Helianthus bolanderi Peter H. Raven and R. Snow 1959-9-11 14424 Colusa about 2 mi se Happy Camp 762 Comment
  UC1299269  Helianthus bolanderi Freed W. Hoffman 1947-6-19 1617 Colusa Cook Springs North Coast Ranges, Cook Springs Comment
  UCR196276  Helianthus bolanderi Ellen Dean, Gordon Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3903 Colusa Payne Ranch (owned by BLM), lands to the southwest of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek, c. 1.0 mi southwest of parking lot 390 Comment
  UCD70229  Heliotropium curassavicum var. oculatum D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. Annual plant communities on serpentine temporal vernal pools. 370 Comment
  CHSC94523  Heliotropium europaeum Lowell Ahart 2006-8-22 13228 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  CHSC84971  Helminthotheca echioides Lowell Ahart 2003-10-23 10661 Colusa Along Squaw Creek, just south of East Park Reservoir, about 1/8 mile northwest of Sites Lodoga Road, about 1 mile north of Lodoga, about 21 miles west of Maxwell. 368 Comment
  JEPS104401  Helminthotheca echioides Lowell Ahart 2003-10-23 10661 Colusa Along Squaw Creek, just south of East Park Reservoir, ca 1/8 mi nw of Sites Lodoga Rd, ca 1 mi n of Lodoga, ca 21 mi w of Maxwell. 368 Comment
  JEPS86622  Hemizonella minima L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-19 6702 Colusa 0.5 km w Summit Springs (sw flank of mountain, Colusa-Lake County line); Snow Mountain 1500 Comment
  UCD82509  Hemizonia Craig Thomsen; G. Harrington 2009-5-12 2867 b Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  UC1563854  Hemizonia clevelandii Barbara Ertter with Elizabeth Neese, Laura Fujii, and Dawn Espindola 1989-10-21 8876 Colusa near East Park Road from Stonyford (nw side of East Park Reservoir); East Park Reservoir 365 Comment
  CAS-BOT-BC306024  Hemizonia congesta subsp. clevelandii H. M. Hall 1930-10-3 12937 Colusa Two miles south of Stonyford Comment
  JEPS40378  Hemizonia congesta subsp. clevelandii W. L. Jepson 1938-6-11 18987 Colusa on creek 4 mi se Wilbur Sprs.; Bear Creek Comment
  UC195406  Hemizonia congesta subsp. clevelandii A. A. Heller 1916-6-6 12358 Colusa 3 mi w Leesville (on the grade); Coast Range Comment
  RSA0115040  Hemizonia congesta subsp. clevelandii Lyman Benson 1948-7-16 12923 Colusa Road between Williams and Clear Lake just east of Lake Co. line. Mt. Range: Inner North Coast. 548 Comment
  UC725797  Hemizonia congesta subsp. luzulifolia A. A. Heller 1939-10-1 15482 Colusa between Williams Maxwell Comment
  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
  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
  CHSC80150  Hemizonia parryi subsp. parryi B. Castro; G. Kuenster 2000-7-19 1202 Colusa Vicinity of Maxwell, Funks Creek, and the Glenn-Colusa canal, on low terrace beside S edge of shallow intermittent stream channel draining eastward out of the hills east of Golden Gate. 41 Comment
  UCR141662  Hemizonia pungens subsp. septentrionalis Jerry Schmierer 1999-4-27 s.n. Colusa Sacramento Valley, Colusa County Comment
  SD40656  Hesperocyparis sargentii Carl B. Wolf, E. R. Johnson 1934-10-15 Colusa Cook Springs (western part of county) 550 Comment
  CAS-BOT-BC175982  Hesperolinon californicum A. A. Heller 1916-6-6 12352 Colusa Coast Range on the grade about 3 miles west of Leesville Comment
  CHSC48598  Hesperolinon californicum Vernon Oswald 1986-5-12 2010 Colusa Brim Rd. (Bartlett Springs Rd.) 2.1 mi w of Bear Valley Rd. Common in a grassy opening on a serpentine slope. 487 Comment
  JEPS122888  Hesperolinon californicum Adam C. Schneider with Will Freyman and Yuri P. Springer 2014-5-20 642 Colusa Along north side of Brim Rd east of Indian Valley Reservoir, near Colusa/Lake Co line. Comment
  UC867722  Hesperolinon californicum A. A. Heller 1916-6-6 12352 Colusa on the grade about 3 mi w Leesville; Coast Range Comment
  UCD110497  Hesperolinon californicum D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. 370 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
  UCD66457  Hesperolinon californicum Craig D. Thomsen 2000-6-7 2362 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  UCD81215  Hesperolinon californicum Ellen Dean; K. Mawdsley, B. Rice, G. Harrington, and J. Alderson 2009-5-6 5552 Colusa Payne Ranch, lands to the SW of the jct. of Hwys. 16 and 20. Destinella Flat area on the S side of Hwy. 20. Top of ridge to the E of Destanella Flat. 578 Comment
  UCR200666  Hesperolinon californicum Craig D. Thomsen 2008-5-31 2759 Colusa BLM Payne Ranch, southwest of intersection between Hwy 16 and Hwy 20, Cowboy Camp farea on the west side of Hwy 16, 1 mile south of Hwy 20, 0.25 mi. west of public viewing area and Bear Creek Comment
  UC1552829  Hesperolinon californicum Frederica Bowcutt 1985-5-5 511 Colusa nw Wilbur Springs; Big Valley Shale Barrens Comment
  UCD110514  Hesperolinon didymocarpum D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. 370 Comment
  CHSC106245  Hesperolinon disjunctum B. Castro; L. P. Janeway 2001-6-3 1258 A Colusa Inner North Coast Ranges. Spring at Grapevine flat, on top of Walker Ridge about 0.5 mi E of Baldy Mountain. East-facing slope/bench with large springy/meadowy area. At upper edges of meadow. 883 Comment
  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
  UC1212491  Hesperolinon disjunctum Helen K. Sharsmith 1953-6-18 4255 Colusa road between Fouts Springs and Stoneyford; Inner North Coast Ranges, Mendocino National Forest, Candy B 609 Comment
  UC1212512  Hesperolinon disjunctum Herbert L. Mason 1946-5-31 12813 Colusa one mi e Lake County line (Bartlett Springs to Williams road); Inner North Coast Ranges 609 Comment
  UC1212515  Hesperolinon disjunctum Herbert L. Mason 1952-6-19 14301 Colusa slope between Fouts Springs Red Bridge Public Camp; Inner North Coast Ranges, Mendocino National Forest Comment
  UC1509756  Hesperolinon disjunctum C. M. Rogers 1972-7-5 13423 Colusa along Route 20 at Colusa-Lake County line 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
  UCR148797  Hesperolinon disjunctum Daniel Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley, Bear Valley Road, Bear Valley Creek 372 Comment
  UCR71414  Hesperolinon disjunctum H. K. Sharsmith 1965-6-23 5529 Colusa Inner North Coast Ranges, c. 1/4 mi. east of Cook Springs 534 Comment
  CAS-BOT-BC176220  Hesperolinon disjunctum Helen K. Sharsmith 1953-6-18 4254 Colusa One mile beyond Wolf Glade on spur road, drainage of Stoney Creek, Mendocino National Forest 609 Comment
  CAS-BOT-BC176222  Hesperolinon disjunctum Helen K. Sharsmith 1953-6-18 4253 Colusa Near road from Stoneyford to Fouts Springs, ca. one mile above Diversion Dam of Big Stoney Creek, Mendocino National Forest 518 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
  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
  JEPS60199  Heterocodon rariflorum L. R. Heckard 1969-5-28 2235 Colusa about 6 air mi w Stonyford (along Stony Creek at Fout Springs); Stony Creek, Fout Springs 518 Comment
  SEINET10460718  Heterocodon rariflorum Lawrence R. Heckard Heckard 2235 Colusa 6 MI W OF STONYFORD 1700 Comment
  RSA0072452  Heteromeles arbutifolia Michael A. Vincent, Robert M. Rhode 1996-3-30 7296 Colusa Along Brim Rd., 1.9 mi. W jct. Bear Valley Rd. Comment
  JEPS15028  Hibiscus lasiocarpos Milo S. Baker 1946-9-4 11608 Colusa Butte Sink, near gate of Colusa Gun Club Comment
  UC931960  Hibiscus lasiocarpos Verne Grant and Alva Grant 1946-8-6 7837 Colusa 1 mi. n. of Butte Outing Gun Club near Colusa (Butte Creek); Butte Creek Comment
  JEPS73513  Hieracium greenei L. R. Heckard 1972-7-10 3131 Colusa overlooking and 3 mi w of Fouts Springs (woods near promontory on se corner of mountain); Snow Mt. 1828 Comment
  UCD133113  Hieracium greenei G. L. Stebbins Jr. 1964-7-4 6171 Colusa northeast side of Mt. St. John, west of Stonyford. 1524 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
  POM163516  Hordeum Roxana S. Ferris 1926-4-22 6300 Colusa 2 miles west of Colusa Comment
  JEPS75407  Hordeum brachyantherum subsp. brachyantherum W. L. Jepson 1932-5-8 16288 Colusa Stonyford 365 Comment
  CHSC106241  Hordeum brachyantherum subsp. californicum B. Castro; L. P. Janeway 2001-6-3 1260 Colusa Inner North Coast Ranges. 'Til Jones Spring' at headwaters of Freshwater Branch of E. Fork Sulphur Ck, 0.6 mi E of top of Walker Ridge. Ca 3 air mi W of S end of Bear Valley, and 1.75 air mi SSE of Cold Spring Mtn. Just downslope from Walker Ridge Rd., in opening in surrounding serpentine chaparral. 822 Comment
  JEPS118603  Hordeum brachyantherum subsp. californicum B. Castro, L. P. Janeway 2001-6-3 1260 Colusa Inner North Coast Ranges. Til Jones Spring at headwaters of Freshwater Branch of E. Fork Sulphur Creek, 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. Wilbur Springs 7.5' quad. Comment
  CAS-BOT-BC284988  Hordeum depressum Roxana S. Ferris 1917-4-12 518 Colusa 4 miles east of Williams Comment
  CHSC112265  Hordeum depressum Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18637 Colusa Inner North Coast Range. North side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  JEPS120993  Hordeum depressum Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18637 Colusa Rocky serpentine outcrop on the north side of Hwy 20, just east of Lake County line, 12.2 air miles east northeast of the town of Clear Lake, 17.1 air miles west of Williams. Comment
  UCD162991  Hordeum depressum Craig D. Thomsen 2000-4-28 2182 Colusa Bear Creek Botanical Management Area. Roadside shoulder of Hwy 20 (south side), about 0.5 mile west of Hwy 20/16 intersection. 345 Comment
  CHSC53989  Hordeum jubatum Vernon H. Oswald 1991-4-21 4526 Colusa Four Mile Rd, 1.9 mi north of Maxwell Colusa Rd. Roadside ditches in area of rice fields. 27 Comment
  CAS-BOT-BC285061  Hordeum marinum subsp. gussoneanum Roxana S. Ferris 1926-4-22 6290 Colusa 3 miles west of Colusa Comment
  CHSC83705  Hordeum marinum subsp. gussoneanum L. P. Janeway 2002-4-24 7520 Colusa Sacramento Valley/Inner North Coast Ranges border. Vicinity of Logan Ridge, Stone Corral Creek, and Funks Creek. 103 Comment
  CHSC86611  Hordeum marinum subsp. gussoneanum Jenny Marr; Heidi West, Caroline Warren 1998-4-16 Colusa Vicinity of Antelope Valley and Grapevine Creek. 121 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
  SEINET3271561 Image available Hordeum murinum George K. Helmkamp, E. A. Helmkamp 2009-3-11 14371 Colusa Inner North Coast Range Foothills; along CA-20, 14.3 miles southwest of Williams 375 Comment
  SEINET10595754  Hordeum murinum Roxana S. Ferris 1917-4-12 Ferris 515 Colusa 4 miles E of Williams Alkali plains. 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
  UCD86153  Hordeum murinum subsp. leporinum Beecher Crampton 1962-4-17 6214 Colusa Sycamore. Comment
  CHSC71448  Horkelia californica subsp. dissita Vernon H. Oswald; Lowell Ahart 1998-7-15 9270 Colusa Bartlett Springs Rd. 1.6 mi west of Bear Valley Rd. In a meadow. 487 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
  JEPS80063  Hydrophyllum occidentale L. R. Heckard and J. Hickman 1979-6-15 5069 Colusa saddle between e and w peaks Snow Mt. 2103 Comment
  JEPS80445  Hypericum formosum var. scouleri L. R. Heckard and J. C. Hickman 1980-9-15 5422 A Colusa w. of Summit Springs (Snow Mt.); Snow Mt. 1554 Comment
  JEPS80769  Hypericum formosum var. scouleri L. R. Heckard and J. C. Hickman 1981-7-30 5737 Colusa s.e. side Snow Mt. (along Trout Creek trail) 1676 Comment
  SEINET11259792 Image available Hypochaeris glabra R. R. Halse 2007-3-25 7122 Colusa Along State Hwy. 20 ca. 7.8 miles northeast of its junction with State Hwy. 16, at base of Salt Canyon. 100 Comment
  SEINET255491  Hypochaeris glabra Richard R. Halse 2007-3-25 7122 Colusa Along State Hwy. 20 ca. 7.8 miles northeast of its junction with State Hwy. 16, at base of Salt Canyon. 100 Comment
  UCD82460  Hypochaeris glabra Craig Thomsen; G. Harrington 2009-5-12 2838 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  JEPS81320  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
  JEPS80126  Iris tenuissima L. R. Heckard with J. Hickman 1980-7-1 5285 Colusa 10 mi w Stonyford (Summit Springs to Frog Lake, Snow Mt., Colusa-Lake County boundary); Snow Mt. 1706 Comment
  CDA19078  Isatis tinctoria R. Breckenridge, Kratville 2001-4-3 PDR 958965 Colusa Sacramento Valley; At junction of I-5 Southbound and Hahn Rd, Williams. 0 Comment
  UCD63772  Iva axillaris Craig D. Thomsen 2008-3-30 2723 Colusa BLM Payne Ranch. Southwest of intersection of Hwy 16 and Hwy 20, 0.25 mile west of Hwy 16, about 1 mile south of Hwy 20. Comment
  CHSC32202  Ivesia gordonii James Jokerst 1980-8-8 1076 Colusa North Coast Ranges. Near Snow Mountain (west). Comment
  CHSC79769  Juglans californica var. hindsii L. P. Janeway; Caroline Warren 2000-4-6 6660 Colusa Vicinity of Lurline Creek and Standard Road. 51 Comment
  JEPS80386  Juncus L. R. Heckard, and J. Hickman 1981-6-22 5619 Colusa Dark Hollow Creek Snow Mt. 1889 Comment
  JEPS106451  Juncus Barrett Anderson 2003-6-19 4875 Colusa Colusa County Airport along Hwy 20 SE of City of Colusa, pond N of the runway. 13 Comment
  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
  CHSC86837  Juncus balticus 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
  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
  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
  UCD81220  Juncus bufonius Ellen Dean; K. Mawdsley, B. Rice, G. Harrington, and J. Alderson 2009-5-6 5557 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. Canyons south of Destanella Flat. 438 Comment
  JEPS121120  Juncus bufonius var. bufonius Lowell Ahart 2013-5-1 18691 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
  UCSB63777  Juncus bufonius var. bufonius Oswald, Vernon; Ahart, Lowell 1998-7-15 Colusa West side of county on Walker Ridge Rd; 8.2 mi south of Bartlett Springs Rd; 6.3 mi north of Hwy. 20; T14N R6W Sect. 12 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
  JEPS93871  Juncus bufonius var. congestus Vernon H. Oswald and Lowell Ahart 1998-7-15 9305 Colusa w side of county on Walker Ridge Road 8.2 mi s of Bartlett Springs Road (6.3 mi n of Highway 20); Walker Ridge Road 792 Comment
  JEPS75718  Juncus covillei L. R. Heckard 1974-9-9 3844 Colusa just se Foutch Camp; Snow Mt. 1889 Comment
  JEPS80387  Juncus covillei L. R. Heckard and J. Hickman 1981-6-22 5620 Colusa along Dark Hollow Creek Snow Mt. 1889 Comment
  JEPS15540  Juncus covillei var. obtusatus G. Thomas Robbins with L. R. Heckard 1956-7-25 3698 Colusa se extension Snow Mt. West (at e base of ridge that forms extension, about 0.5 air mi from its summit, Lake-Colusa County boundary) 1889 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
  CHSC94441  Juncus ensifolius Lowell Ahart 2006-8-9 13145 Colusa North side and just east of the bridge across Stony Creek, just north of Stonyford. 347 Comment
  RSA724953  Juncus ensifolius L. Ahart 2006-8-9 13145 Colusa North side and just east of the bridge across Stony Creek, just north of Stonyford 348 Comment
  UCD18851  Juncus mexicanus Vernal Pool Team 2001; Carol Witham and Jennifer Buck 2001-4-30 159 Colusa 2 mi. south of the town of Colusa along Hwy 20, east of Hwy 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001, UTMs: 10S0587786; 4336302. Comment
  UCD82439  Juncus patens Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5665 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 869 Comment
  CHSC90870  Juncus phaeocephalus D. Isle 2002-6-28 176 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. Below a 4x4 Rd. 17N31 (Lovelady Ridge Jeep Rd.). 1060 Comment
  CHSC97128  Juncus usitatus Lowell Ahart 2007-7-7 14258 Colusa South of the wire fence, on the south side of the Gridley Colusa Highway, about 1 1/4 miles east of River Road, about 17 miles west of Gridley. 20 Comment
  HSC100768  Juncus usitatus Lowell Ahart 2007-7-7 14258 Colusa S side of the Gridley-Colusa Hwy., ~1 1/4 mi. E of River Rd. and 17 mi. W of Gridley. 20 Comment
  UCD169280  Juncus usitatus Lowell Ahart 2007-7-7 14258 Colusa About 17 miles west of Gridley, About 1 1/4 miles east of River Road, on the south side of the Gridley Colusa Highway, south of the wire fence. 20 Comment
  JEPS118670  Juncus xiphioides L. P. Janeway and B. Castro 2011-5-19 10289 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 1.9 km southeast of Funks Reservoir and 0.2 km northeast of Tehama-Colusa Canal. Comment
  UCD163648  Juncus xiphioides Craig Thomsen 1998-6-19 1944 Colusa Bear Valley. About 8.5 miles north of Hwy 20. Comment
  UCR280794  Juncus xiphioides var. xiphioides David Isle 2014-6-7 2133 Colusa North Coast Range, c. 1 mile south of Stonyford, David and Rhonda Isle property. West bank of Salt Creek, just north of second curve north of bridge on Dennis Drive 366 Comment
  CHSC81201  Juniperus californica L. P. Janeway; B. Castro 2001-4-12 7017 Colusa Vicinity of Grapevine Creek, Funks Creek, and Antelope Valley. 158 Comment
  UCD70298  Juniperus californica D. Sanchez-Mata 1998-7-9 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain Road between Lodoga and Red Rock Cabin. Open California juniper woodland (Juniperus californica). 420 Comment
  UCD72539  Keckiella lemmonii Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3830 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. East side of Bear Creek, just south of BLM parking lot (ca. 10 miles). 252 Comment
  CHSC32198  Kelloggia galioides James Jokerst 1980-8-8 1083 Colusa North Coast Ranges. Near Snow Mountain (west). Comment
  JEPS110095  Kickxia elatine Lowell Ahart 2006-8-9 13134 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  UCD164166  Koeleria macrantha Craig Thomsen 2001-5-6 2558 Colusa Wilbur Hot Springs. Comment
  UCD72528  Koeleria macrantha Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3819 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. West side of Bear Creek along trail that begins approximately opposite the BLM parking lot near south end of bridge. Approx. 0.75 mile along trail. 286 Comment
  UCR205140  Lactuca serriola George K. Helmkamp, E. A. Helmkamp 2008-10-14 14244 Colusa Sacramento Valley, along CA-20, 0.2 mile east of the Sutter County line 9 Comment
  CAS-BOT-BC341395  Lagophylla minor R. F. Hoover 1938-4-24 3226 Colusa Ridge between Venado and Leesville Comment
  RSA724937  Lagophylla minor L. Ahart 2006-6-11 12667 Colusa On the east side of an off road trail (Trail 30) about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford 613 Comment
  UC638652  Lagophylla minor Ethel Crum 1938-5-8 2033 Colusa 3 mi n Leesville; Inner North Coast Range Comment
  UCD66589  Lagophylla minor Craig D. Thomsen 2000-4-28 2236 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
  UCD82519  Lagophylla minor Craig Thomsen; G. Harrington 2009-5-12 2876 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 713 Comment
  JEPS39671  Lagophylla minor Rimo Bacigalupi, T. Crovello, and L. Heckard 1965-4-26 9046 Colusa on road to Bartlett Springs 2 mi from Ladoga junction (summit w of Bear Valley, Colusa-Lake County boundary) 670 Comment
  CAS-BOT-BC341472  Lagophylla ramosissima Roxana Stinchfield 1916-6-22 313 Colusa College City Comment
  SEINET9310484  Lagophylla ramosissima Unknown 2009-5-20 14740 Colusa Central Inner Coast Ranges: along CA-16 near Bear Creek, 1.6 miles S of the jct with CA-20 (Glasscock Mountain 7.5' W). Chaparral and oak woodland. Occasional on open flat in disturbed soil. Comment
  HSC48034  Lasthenia californica Thomas W. Nelson, Jane P. Nelson 1978-4-29 3939 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  UCD23380  Lasthenia californica subsp. californica George C. Ziobro 1978-4-8 2 Colusa collected off of Bear Valley Road 10.3 miles north of the junction with State Route 20. 396 Comment
  CAS-BOT-BC324484  Lasthenia ferrisiae Alice Eastwood 1921-4-11 10232 Colusa Colusa Comment
  UC725317  Lasthenia ferrisiae A. A. Heller 1929-3-12 14824 Colusa 2 mi n Maxwell Comment
  UC90030  Lasthenia ferrisiae K. Brandegee Apr 1889 Colusa Colusa Junction Comment
  CAS-BOT-BC353481  Lasthenia fremontii Roxana S. Ferris 1917-4-12 531 Colusa 4 miles E of Williams Comment
  SEINET5712846  Lasthenia glaberrima J. M. Tucker 1978-1 4408 Colusa West side of Bear Valley Road, 11 miles (by road) north of junction with State Hwy 20. 366 Comment
  UCD163703  Lasthenia glabrata Craig Thomsen 1999-5-10 2015 Colusa Bear Valley. About 9 miles north of Hwy 20. Comment
  CDA32830  Lasthenia glabrata P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  POM163441  Lasthenia glabrata subsp. coulteri Roxana S. Ferris 1926-4-22 6288 Colusa 3 miles W of Colusa. 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
  CHSC53935  Lasthenia minor Vernon H. Oswald 1991-4-21 4527 Colusa Four Mile Rd, 3.1 mi south of Norman Rd, west-southwest of Princeton. Along the edge of the road. 27 Comment
  JEPS81323  Lathyrus jepsonii var. californicus L. R. Heckard and J. C. Hickman 1982-7-6 5938 Colusa about 0.5 mi ne Summit Springs (e of trail, s side of Snow Mt.); Snow Mt. 1645 Comment
  UCD81710  Lathyrus jepsonii var. californicus Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5716 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones Spring area on W side of road, ca. 6.5 road mi N of junction with Hwy 20. W side of road. 833 Comment
  HSC95475  Lathyrus vestitus subsp. vestitus A. Skelly, B. Bletcher, G. McCabe 1996-3-30 10 Colusa 1.6 mi. W of Bear Valley Rd. and Brim Rd. on Brim Rd., 14.7 mi. on Walker Ridge Rd. to Brim Rd., 57 mi. E of Hwy. 101 on Hwy. 20, Leesville Comment
  HSC95805  Lathyrus vestitus subsp. vestitus A. Skelly, B. Bletcher, G. McCabe 1996-3-30 10 Colusa 1.6 mi. W of Bear Valley Rd. and Brim Rd. on Brim Rd., 14.7 mi. on Walker Ridge Rd. to Brim Rd., 57 mi. E of Hwy. 101 on Hwy. 20, Leesville Comment
  CHSC62933  Lathyrus vestitus var. vestitus Vernon H. Oswald; Lowell Ahart 1994-4-6 6070 Colusa Goat Mtn. Rd. 0.3 mi S of Sullivan Creek Bridge, SW of Digger Pine Flat, S of Stonyford. 487 Comment
  CDA11406  Layia chrysanthemoides G. F. Hrusa, K. van Katwyk 1995-4-22 12127 Colusa Inner North Coast Ranges; Bear Valley, 15 m. N of Hwy. 20. Comment
  CHSC53936  Layia chrysanthemoides Vernon H. Oswald 1991-4-21 4521 Colusa Bear Valley Rd in Bear Valley, 1.0 mi south of Brim Rd (Bartlett Springs Rd), west of Williams. Roadside. 417 Comment
  JEPS13437  Layia chrysanthemoides R. F. Hoover 1938-4-24 3221 Colusa Williams Comment
  UC762527  Layia chrysanthemoides R. F. Hoover 1938-4-24 3221 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
  UCR212376  Layia chrysanthemoides Ellen Dean, Craig D. Thomsen, N. Voegtly, J. Alderson, Gordon Harrington 2008-3-30 4663 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Near corral on west side of Bear Creek just south of Hwy 20 320 Comment
  CAS-BOT-BC323904  Layia chrysanthemoides Roxana S. Ferris 1917-4-12 506 Colusa 4 miles E of Willaims. Alkali Plains. 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
  UCD15435  Layia chrysanthemoides Lisa Montang 1985-4-13 3 Colusa California, Colusa Co.; Bear Valley, 3.8 miles north of Wilbur Springs Road and Highway 20 intersection. 390 Comment
  UCR7836  Layia fremontii Marilyn Malin 1968-3-30 243 Colusa Coast Range, north side of Hwy 16, between Hwy 16 and Cache Creek at jct of Hwy 16 and Hwy 20 Comment
  UC89186  Layia gaillardioides Katharine Curran 1884-5-1 Colusa Leesville Comment
  CHSC110419  Layia platyglossa David Isle; Rhonda Isle; Hank Switzer 2011-4-14 1950 Colusa North Coast Ranges. Bear Valley on S edge of Bear Valley R. MDBM. Comment
  CHSC53937  Layia platyglossa Vernon H. Oswald 1991-4-21 4522 Colusa Bear Valley Rd in Bear Valley, 3.3 mi south of Brim Rd (Bartlett Springs Rd), west of Williams. Roadside. 417 Comment
Read comments
May 24 2013
  UCD15426  Layia platyglossa Margit Sands 1985-4-13 29 Colusa in Bear Valley, 3.8 miles north of Wilbur Hot Springs rd. 390 Comment
  UCD57327  Layia platyglossa Amy Whitcomb 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
  UCR52395  Layia platyglossa N. Williams, Terry Hines, Ellen Purcell 1988-4-17 56 Colusa 1.3 mi S on Bear Valley Rd. from corner of Brim Rd. 396 Comment
  SEINET11447842 Image available Layia platyglossa M. J. Williams 1967-5-7 s.n. Colusa Bear Valley 396 Comment
  UCD82338  Layia platyglossa Robin McMaster 1973-4-15 324 Colusa 100 yd from junction of Hwys 16 and 25, next to Bear Valley Creek. Comment
  CAS-BOT-BC329323  Layia septentrionalis James Jokerst 1985-4-10 2227 Colusa Near Walker Ridge. 547 Comment
  CHSC62838  Layia septentrionalis Vernon H. Oswald; Lowell Ahart 1994-3-23 6020 Colusa Goat Mtn. Rd. just W of the bridge over Sullivan Creek, S of Stonyford. Between the road and Little Stony Creek. 505 Comment
  CHSC91515  Layia septentrionalis D. Isle 1995-4-30 391 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. Goat Mt. Rd. (Little Stony Rd.), 5.1 mi. out from jct. with Stonyford-Lodoga Rd. and just W of Sullivan Creek Bridge. 487 Comment
  JEPS13435  Layia septentrionalis R. F. Hoover 1938-4-23 3206 Colusa grade on Rumsey; Arbuckle road Comment
  JEPS13436  Layia septentrionalis R. F. Hoover 1938-4-24 3213 Colusa Upper Sand Creek Comment
  UC75946  Layia septentrionalis Miss M. Alice King 1905-1-1 Colusa near College City Comment
  UCR261681  Layia septentrionalis Ann Howald 2003-4-23 2312 Colusa Inner North Coast Ranges, Indian Valley, East Park Reservoir, Catholic Point peninsula, east of Coppermine Road, c. 0.35 mi north of intersection with East Ruby King Road 415 Comment
  CAS-BOT-BC527264  Lemna gibba A. A. Heller; H. E. Brown 1902-5-19 5571 Colusa Near Colusa Comment
  CHSC46882  Lemna trisulca Vernon Oswald 1989-9-12 4005 Colusa Lily Pond near Letts Lake in the Mendocino National Forest, ca. 10 mi (air) sw of Stonyford. In pool at the outlet of the 'Lily Pond. 1341 Comment
  CAS-BOT-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
  CAS-BOT-BC527301  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
  POM312464  Lemna trisulca C. Ritchie Bell 1951-6-13 1167 Colusa Lake below Letts Meadow on road from Bear Creek to Foutes Spring 915 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
  HSC101408  Lepidium chalepense J. P. Smith 2011-4-27 13143 Colusa Along Hwy. 16, 1.3 mi. S of junction with Hwy. 20 315 Comment
  UC117628  Lepidium dictyotum var. acutidens K. Brandegee Apr 1889 Colusa Colusa Junction 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
  HSC72170  Lepidium lasiocarpum J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9542 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  UCD72469  Lepidium latifolium Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3803 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. Bank of Bear Creek near north end of bridge, west side of creek. 260 Comment
  CHSC111210  Lepidium latifolium David Isle 2013-9-23 2050 Colusa Salt Creek N of Dennis Dr. bridge; Isle property. Comment
  UC398784  Lepidium latipes Brandegee Apr 1889 Colusa Colusa Junction Comment
  CHSC86962  Lepidium strictum B. Castro 2003-4-10 1424 Colusa Vicinity of Logan Ridge, Sulphur Gap and Lurline Creek. In bed of dirt road near confluence of small creeks, on west edge of Sacramento Valley. 85 Comment
  RSA799180  Lepidium strictum George K. Helmkamp, E. A. Helmkamp 2011-4-1 17134 Colusa Eastern foothills North Coast Ranges: Antelope Valley, along Maxwell-Sites Road, 2.0 mi southeast of Sites. 85 Comment
  UC1100305  Leptochloa fascicularis Herbert L. Mason and Verne Grant 1946-8-6 12962 Colusa pond on Colusa-Marysville Hwy 4 mi s Colusa (w side of Sacramento River) Comment
  UC1100306  Leptochloa fascicularis Herbert L. Mason 1945-9-19 12720 A Colusa e bank of river 1 mi n Colusa (below causeway); Sacramento River Comment
  UCD63675  Leptochloa fusca subsp. fascicularis Elizabeth Wilson 1940-1 Colusa Colusa. Comment
  CHSC25167  Leptosiphon acicularis Willis Ball 1970-4-4 96 Colusa 10 miles W. of Williams. Beside Highway 20. Comment
  CHSC79790  Leptosiphon bicolor L. P. Janeway; B. Castro 2000-5-1 6688 Colusa Vicinity of Grapevine Creek and Sites-Lodoga Road. 201 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
  UCD57330  Leptosiphon bicolor Amy Whitcomb 2007-3-25 2 Colusa BLM Payne Ranch. Destanella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 560 Comment
  UCD58114  Leptosiphon bicolor Ellen Dean; G. Harrington and P. McIntyre 2007-3-16 3381 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. Along unimproved road that goes south from Hwy. 20, ca. 2.3 road miles W of junction with Hwy. 16. Unnamed valley with old building called 'Roadkill Cafe. 414 Comment
  HSC85934  Leptosiphon bicolor Michalski, Raum, Hopson 1987-4-12 61 Colusa Side of Leesville-Williams Rd. Comment
  UCD14428  Leptosiphon bicolor 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
  UCD67031  Leptosiphon bolanderi Ellen Dean; Davis Botanical Society 2008-5-31 5013 Colusa west of I-5 at Maxwell, Goat Mountain, ridge below summit off of Goat Mountain Road. 1734 Comment
  POM310950  Leptosiphon bolanderi H. L. Mason 1941-4-5 12404 Colusa Three miles south of Stonyford Comment
  CHSC86028  Leptosiphon ciliatus Jenny Marr; H. West, J. Lacey, C. Warren, N. Wight 1998-4-14 Colusa Vicinity of Grapevine Creek, Antelope Valley, and Sites-Lodoga Road. 121 Comment
  HSC65995  Leptosiphon ciliatus Cathie Goldberg, Lynn Kunstman, Lauren Philbrick, Geoff Walsh 1980-4-19 51 Colusa Leesville Rd. from Leesville to Williams, 3.8 mi. E of Leesville Comment
  POM174562  Leptosiphon ciliatus Roxana S. Ferris 1926-4-23 6430 Colusa Near summit on grade. Williams- Stonyford Road. Comment
  HSC47564  Leptosiphon ciliatus J. P. Smith, J. O. Sawyer 1978-4-29 9796 Colusa Bear Valley Rd., 5.9 mi. from its junction with Hwy. 20 366 Comment
  RSA232952  Leptosiphon ciliatus D. A. Young 1969-5-4 P- 325 Colusa Approx. 10 mi W. of Wilbur Springs along Hwy 16. 610 Comment
  RSA589922  Leptosiphon ciliatus Michael A. Vincent, Robert M. Rhode 1996-3-30 7291 Colusa Along Bear Valley Rd., 2.5 mi N jct. Wilbur Springs Rd. Comment
  RSA275358  Leptosiphon filipes Thomas W. Nelson, Jane P. Nelson 1978-4-29 3935 Colusa Along Bear Valley Rd. 2.5 miles from junction with State Route 20. 366 Comment
  CHSC1269  Leptosiphon parviflorus V. Holt 1935-5-12 Colusa Stonyford. Comment
  UCD118988  Leptosiphon parviflorus Robert E. Preston 1995-6-2 869 Colusa Walker Ridge. 1005 Comment
  UCR261672  Leptosiphon pygmaeus subsp. continentalis Ann Howald 2003-3-26 2294 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3.1 miles north of Lodoga, near shore of reservoir 370 Comment
  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
  UC1299302  Lessingia micradenia var. glabrata Freed W. Hoffman 1947-6-19 1658 Colusa Cooks Springs Comment
Read comments
Sep 27 2007
  JEPS120715  Lessingia ramulosa Lowell Ahart 2013-10-1 19068 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
  JEPS94888  Lessingia ramulosa Vernon H. Oswald and Lowell Ahart 1998-7-15 9276 Colusa w side of county on Sawtelle Valley Road 0.4 mi n of Bartlett Springs Road; Sawtelle Valley Road 670 Comment
  UC2014145  Lessingia ramulosa Ellen Dean, C. Thomsen, T. Hansen, windfarm meeting 2010-6-11 6145 Colusa Colusa County. Walker Ridge. Along Walker Ridge Road, N of turnoff to Indian Valley Reservoir but S of Til Jones Spring. Many old undeveloped roads here. Comment
  UCD163655  Lessingia ramulosa Craig Thomsen 1998-6-10 1953 Colusa Bear Valley. About 7 miles north of Hwy 20. 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
  UCD66708  Lessingia ramulosa Craig D. Thomsen 2001-5-24 2507 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.17 and 2.25. 342 Comment
  UC1736070  Lewisia rediviva var. rediviva Dean W. Taylor 1993-3-18 13310 Colusa East Park Reservoir, on stony hillsides ca. 0.4 miles due west from spillway into Little Stony Creek, 411 Comment
  JEPS15551  Lewisia triphylla G. Thomas Robbins with L. R. Heckard 1956-7-25 3708 Colusa meadow along trail due s, skirting e base of ridge forming Snow Mt. West Snow Mt. East; Snow Mt. West 1981 Comment
  JEPS80163  Lewisia triphylla L. R. Heckard with J. Hickman 1980-7-2 5314 A Colusa ca. 10 mi w Stonyford (first meadow n of summit of trail from Frog Pond to Milk Ranch; w of Snow Mt. West) 1950 Comment
  CAS-BOT-BC444476  Lewisia triphylla G. Thomas Robbins; L. R. Heckard 1956-7-25 3708 Colusa Along trail due south of Snow Mt. East and skirting the eastern base of the ridge forming Snow Mt. West 2042 Comment
  CDA32489  Leymus triticoides W. C. Disney Jr. 1959-5-8 2344 Colusa Princeton area 0 Comment
  JEPS96000  Lilium pardalinum subsp. pardalinum Vernon H. Oswald and L. Ahart 1999-6-22 9789 Colusa 2.2 mi west of Stonyford-Lodoga Road on County Road 42 paralleling Little Stony Creek: T17N R6W Sect. 30, ca. 1400 ft, chaparral, serpentine substrate 426 Comment
  CHSC53964  Limnanthes douglasii subsp. nivea Vernon H. Oswald 1991-4-21 4517 Colusa Lodoga Stonyford Rd, ca. 2 mi south of Stonyford. Along drainages in pastures. 371 Comment
  UCD33937  Limnanthes douglasii subsp. nivea Beecher Crampton 1958-4-21 9168 Colusa Colusa County, 2 miles W.N.W. of Lodoga. Comment
  UCD66941  Limosella acaulis Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5090 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
  CDA11404  Linanthus ciliatus G. F. Hrusa, K. van Katwyk 1995-4-22 12125 Colusa Inner North Coast Ranges; Approx. 3 m. NW of Hwy 20 on Leesville Rd. 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
  HSC89699  Linanthus dichotomus Eric German, Klara Varga, Michele Cardinaux 1989-4-15 35 Colusa Goat Mtn. Rd. .2 mi. from Lodoga/Stonyford jct. 152 Comment
  UCD33940  Linanthus dichotomus Beecher Crampton 1958-4-21 9172 Colusa 4 miles NW of Lodoga (by road). Comment
  JEPS15252  Lithophragma affine Rimo Bacigalupi with G. Ledyard Stebbins and Peter Kamb 1950-4-16 3111 Colusa 4 mi s Ladoga (and 6 mi nnw of Leesville, along Little Indian Creek); Indian Valley, Little Indian Creek 396 Comment
  RSA113934  Lithophragma campanulatum H. K. Sharsmith 1953-7-1 4403 Colusa Above Linger Longer Camp. Goat Mountain. Mendocino National Forest. 1616 Comment
  JEPS80090  Lithophragma glabrum L. R. Heckard with J. Hickman 1979-6-16 5098 Colusa nw of West Peak Snow Mt. (s end of Milk Ranch meadow); , , s end of Milk Ranch meadow 1950 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
  RSA0118614  Logfia filaginoides Lowell Ahart 2013-5-1 18678 Colusa Inner North Coast Range. On the north side of the wash, north side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  UC638696  Logfia filaginoides Ethel Crum 1938-5-7 2009 Colusa summit of ridge 4.2 mi n Rumsey; Inner North Coast Range, Comanche Hills 254 Comment
  UCD159333  Logfia filaginoides D. S. Park 2010-6-5 117 Colusa Walker ridge, Cold Spring Mt. roadside and adjacent grassland. 760 Comment
  HSC47737  Logfia gallica Thomas W. Nelson, Jane P. Nelson 1978-4-29 3943 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  UCD143424  Lomatium Oren Pollak 1987-4-10 s.n. Colusa Bear Valley. Comment
  UCD127607  Lomatium californicum D. Sanchez-Mata 1998-7-10 s.n. Colusa Stonyford. Fouts Springs Road. 640 Comment
  SEINET13944350 Image available Lomatium ciliolatum Bonnie Prange 1974-1 sn Colusa Wilbur Springs Quad. Near Clyde Mine. Elev 2800 ft 853 Comment
  HSC60362  Lomatium ciliolatum var. hooveri Phyllis Krieg 1979-4-14 Colusa 1067 Comment
  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
  HSC45713  Lomatium dasycarpum subsp. tomentosum Sheila Logan 1978-4-22 73 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  UCD162978  Lomatium hooveri Jack Major 1963-5-4 s.n. Colusa West of Bear Valley on Bartlett Springs road. (Exact location unknown. Coordinates estimated by label maker.) 609 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
  HSC72294  Lomatium macrocarpum J. P. Smith, Thomas Nelson, Jane P. Nelson 1978-4-2 9545 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 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
  UCD163700  Lomatium macrocarpum Craig Thomsen 1999-5-10 2009 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UC1094589  Lomatium macrocarpum C. R. Bell 1953-3-22 1405 Colusa ca. 2 mi. from Indian Valley (on rd. to Bartlett Springs, e. slope of rirst ridge) Comment
  CDA33696  Lomatium marginatum P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  CHSC77910  Lomatium marginatum var. purpureum Beth Hendrickson; Heidi West 1999-3-23 Colusa Vicinity of Sites and Stone Corral Creek. 121 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
  UCR261619  Lomatium utriculatum Ann Howald 2003-3-25 2287 Colusa Inner North Coast Ranges, Sites-Lodoga Road, c. 1.5 miles east of Grapevine Pass, east of Clark Ridge 319 Comment
  UCD40913  Lomatium utriculatum Jim Mosby 1984-4-21 5 Colusa Bear Valley, 10 miles north on Bear Valley Road. 426 Comment
  CHSC116047  Lomatium vaginatum Richard R. Halse 2014-3-25 9028 Colusa Along the Sites-Logoda Road ca. 5.2 miles northwest of Sites. 175 Comment
  UCD57666  Lonicera interrupta Erica A. Smith; with Plant Biology 102 2007-4-29 4 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central/Eastern part of ranch. Craig Canyon. Along unimproved road, 100 yards west of where road crosses Craig Creek. 313 Comment
  UCD70235  Lonicera interrupta D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. 450 Comment
  CHSC94444  Lotus corniculatus Lowell Ahart 2006-8-9 13129 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS80212  Lotus corniculatus L. R. Heckard and J. Hickman 1980-7-3 5366 Colusa sw slope Snow Mt. (about Summit Springs); , Summit Springs 1554 Comment
  UC1299188  Lotus crassifolius var. crassifolius Freed W. Hoffman 1948-6-27 2515 Colusa 8.6 mi s Fouts Springs (w Colusa Co.); Upper Letts Valley Comment
  JEPS86626  Lotus denticulatus L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-19 6706 Colusa 0.5 km w Summit Springs (sw flank of Snow Mountain, Colusa-Lake County line); Snow Mountain 1500 Comment
  CAS-BOT-BC234977  Lotus grandiflorus Ellen Dean; C. Thomsen; G. Harrington; R. Wilmarth; R. Wenk 2010-6-2 6045 Colusa Walker Ridge. Along Walker Ridge Road on southern part of the ridge, south of turnoff to Indian Valley Reservoir 769 Comment
  JEPS60204  Lotus grandiflorus var. grandiflorus L. R. Heckard 1969-5-29 2240 Colusa about 6.5 air mi se Stonyford (along Trough Spring Ridge road, 0.2 mi n of its junction with Crackerbox Ridge road) 1127 Comment
  POM163464  Lotus humistratus Roxana S. Ferris 1926-4-23 6417 Colusa At Mountain House on the Williams-Stonyford Road. Comment
  UCR225260  Lotus oblongifolius Ellen Dean, Davis Botanical Society 2008-5-31 5055 Colusa west of Hwy I-5 at Maxwell, north slope of Goat Mountain, along Letts Valley Road between Goat Mountain Summit and Fouts Springs 788 Comment
  UC725836  Lotus purshianus var. purshianus A. A. Heller 1919-6-8 13243 Colusa Ladoga Comment
  RSA725014  Lotus unifoliolatus L. Ahart 2006-8-9 13150 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
Read comments
Aug 9 2017
  UCD65956  Ludwigia hexapetala B. J. Grewell 2006-9-15 06- 68 -LU Colusa Colusa National Wildlife Refuge, south of Hwy 20, west of Colusa and Sutter Buttes. 12 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
  UCD82547  Lupinus albifrons Ellen Dean; G. Harrington, C. Thomsen,R. Wilmarth,Chiao-Yi Cheng 2009-5-20 5702 Colusa Walker Ridge. Along Walker Ridge just S of turn-off to picnic area near Cold Spring. 1007 Comment
  RSA590140  Lupinus albifrons var. albifrons M. A. Vincent 1996-3-30 7277 Colusa Along Bear Valley Rd. above Bear Creek, 1.4 mi. S jct Wilbur Springs Rd. Comment
  CDA15481  Lupinus albifrons var. collinus G. F. Hrusa, WTD 1998-6-19 14618 Colusa North Coast Ranges; Along USFS Pacific Ridge Rd. (M5) above intersection with Goat Mtn. Rd. Comment
  CHSC62843  Lupinus albifrons var. collinus Vernon H. Oswald; Lowell Ahart 1994-3-23 6022 Colusa Little Stony Creek just W of Digger Pine Campground on Goat Mtn. Rd., S of Stonyford. 490 Comment
  JEPS22986  Lupinus albifrons var. collinus Stanton A. Cook 1959-5-30 891 Colusa n of the summit Goat Mountain; n of the summit of Goat Mountain 1828 Comment
  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
  CHSC27856  Lupinus bicolor Phil Blumert 1978-3-28 18 Colusa Ca. 0.3 mi w of jct of hwys 20 and 16, s side of Bear Creek, ca. 18 mi sw of Williams. 321 Comment
  UCD163686  Lupinus bicolor Craig Thomsen 1999-4-15 1988 Colusa Bear Valley. About 5 miles north of Hwy 20, west of Bear Valley Rd. Comment
  UCD58101  Lupinus bicolor Ellen Dean; C. Thomsen, S. Bledsoe, G. Harrington, D. Hickson 2007-3-25 3478 Colusa BLM Payne Ranch. Lands to the southwest of the intersection of Hwy. 16 and Hwy. 20. Destanella Flat, just E of the Lake County Border. Ca. 3.4 miles along Hwy. 20 from junction of Hwy. 20 and Hwy. 16. 560 Comment
  UCD15277  Lupinus bicolor Claire Warshaw 1985-4-13 21 Colusa along Bear Valley Road, 45 miles northwest of intersection with Highway 22. 420 Comment
  POM278280  Lupinus bicolor subsp. tridentatus Lyman D. Benson 1935-3-27 6329 Colusa 8 miles E of Lake County line, inner N coast mt. range, Sacramento River watershed 305 Comment
  SEINET12164083  Lupinus densiflorus Unknown 1984-1 11 Colusa ca Salt Canyon, N side of Salt Crk, Hwy 20, 11miWSW of Williams. Wilbur Springs Quad 143 Comment
  CHSC3940  Lupinus densiflorus var. aureus M. Lee 1967-4-29 20 Colusa On N side of Hwy 20 ca. 26 mi. west of Williams. Comment
  RSA10439  Lupinus densiflorus var. aureus Carl B. Wolf 1928-5-8 2129 Colusa Sacramento Valley. 2 miles north of Dunnigans. Comment
  SEINET12161687  Lupinus densiflorus var. aureus Unknown 1977-1 20 Colusa ca 10 m N of Salt Creek, Salt Canyon, Hwy 20, 16kmWSW of Williams. WilburSpringsQuad. seebelow 143 Comment
  UC710400  Lupinus formosus var. robustus C. P. Smith 1946-4-26 46225 Colusa Hiway 99w about 2 mi w College City (Arbuckle - 1.5 mi s); Arbuckle Comment
  RSA716572  Lupinus microcarpus D. Isle 1995-4-27 403 Colusa East Park Reservoir Rd. at N edge just at rt. angle turn, w. of cattle guard 1/4 mi. 348 Comment
  CDA27487  Lupinus microcarpus var. densiflorus L. Ahart 2003-7-14 10390 Colusa On the east and west sides of Bear Valley Road, about 1/4 mile north of the intersection of Bear Valley Road and Wilber Springs Road and bridge. Comment
  CHSC42238  Lupinus microcarpus var. densiflorus Steve Holloway 1986-4-5 4 Colusa Salt canyon, s side of Salt Creek, Hwy 20 11 mi wsw of Williams. 143 Comment
  CHSC48530  Lupinus microcarpus var. densiflorus Vernon Oswald 1986-3-25 1051 Colusa Sites-Lodoga Rd. 5.2 mi ne of Lodoga, 0.6 mi e of Grapevine Pass. Roadcut. 463 Comment
  CHSC91566  Lupinus microcarpus var. densiflorus D. Isle 1995-4-28 402 Colusa Mendocino National Forest--North Coast Ranges. Bear Creek Watershed. Lodoga Rd. just N of Leesville Rd. jct., 1/8 mi., at road edge. 304 Comment
  UCD108711  Lupinus microcarpus var. densiflorus A. A. Heller 1919-5-10 13110 Colusa grade east of Leesville. Comment
  UC73206  Lupinus nanus Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley, near College City Comment
  RSA424766  Lupinus nanus var. apricus Aaron Liston, M. Blumler 1987-4-26 667 -9 Colusa Bear Valley - Lodoga Road, 6.6 miles S of Bartlett Springs Jct. Comment
  HSC45734  Lupinus polycarpus M. Alcasas 1978-4-22 39 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  HSC86906  Lupinus subvexus var. subvexus Terry Hines, Ellen Purcell, N. Williams 1988-4-17 58 Colusa 1.3 mi. S on Bear Valley Rd. from corner of Brim Rd. 396 Comment
  HSC45690  Lupinus succulentus Patricia Shesgreen 1978-4-22 28 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  HSC72173  Lupinus succulentus J. P. Smith, Jane P. Nelson, Thomas W. Nelson 1978-4-2 9550 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  SEINET7096535 Image available Lupinus succulentus Richard R. Halse 2001-3-22 5947 Colusa Williams; along a vacant lot by 455 - 4th street. 39 9.52N 122 8.84W (Converted to decimal degrees). Elevation 18 m. 18 Comment
  UCR206293  Lupinus succulentus George K. Helmkamp, E. A. Helmkamp 2009-5-20 14735 Colusa Central Inner Coast Ranges, along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 320 Comment
  CAS-BOT-BC441312  Luzula subsessilis F. P. Cronemiller 1924-5-12 876 Colusa Lower Letts Valley 1249 Comment
  UCD124975  Lycopus americanus Collector Unknown Date Unknown s.n. Colusa Exact location unknown. Comment
  CHSC107290  Lythrum californicum L. P. Janeway; B. Castro 2011-7-9 10509 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. Edges of swale feeding south side of the marsh; at the only spot of bulrush. 49 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
  UC1191570  Lythrum californicum Herbert L. Mason, Verne Grant 1946-8-7 12977 Colusa 8 mi n of Colusa (Butte Sink); Butte Sink Comment
  RSA0014830  Lythrum californicum H. L. Mason, Verne Grant 1946-8-7 12977 Colusa 8 miles north of Colusa; Butte Sink. Comment
  UCD66929  Lythrum hyssopifolia Craig D. Thomsen; G. Harrington 2008-7-6 2773 Colusa BLM Payne Ranch. Lands to the SW of the jct of Hwys 20 and 16. Western side of ranch, near ridge trail that follows the border of Colusa/Lake Counties. Dunsfield Flat stock pond. 609 Comment
  CHSC84956  Lythrum tribracteatum Lowell Ahart 2003-10-23 10667 Colusa On the east strand of East Park Reservoir, about 1/8 mile northwest of Sites Lodoga Road, about 1 mile north of Lodoga, about 21 miles west of Maxwell. 368 Comment
  CHSC94480  Lythrum tribracteatum Lowell Ahart 2006-8-9 13162 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS104406  Lythrum tribracteatum Lowell Ahart 2003-10-23 10667 Colusa On the e strand of East Park Reservoir, ca 1/8 mi nw of Sites Lodoga Rd, ca 1 mi n of Lodoga, ca 21 mi w of Maxwell. 368 Comment
  UC1609445  Lythrum tribracteatum Vernon H. Oswald and Lowell Ahart 1993-5-27 5429 Colusa 0.5 mi nw of Sites (bordering the w side of Sacramento Valley, Sites-Lodoga Road); Sacramento Valley, Sites-Lodoga Road 121 Comment
  RSA0016023  Lythrum tribracteatum Barbara Ertter, E. Neese, Laura Fujii, Dawn Espindola 1989-10-21 8870 Colusa SE end of East Park Reservoir N of Lodoga. 366 Comment
  CHSC94407  Madia elegans subsp. densifolia Lowell Ahart 2006-8-22 13229 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  CHSC79466  Madia exigua B. Castro; L. P. Janeway 2000-5-2 1106 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 216 Comment
  CHSC79467  Madia exigua B. Castro; L. P. Janeway 2000-5-2 1111 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 231 Comment
  RSA755624  Madia exigua George K. Helmkamp, E. A. Helmkamp 2009-5-20 14741 Colusa Along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 320 Comment
  CHSC101633  Madia gracilis David W. Isle; Rhonda Isle, Ann Isle 2003-5-15 1631 Colusa About 6 miles W of Stonyford; N aspect of serpentine chaparral slope S of M-10 (18N01.2) and just W of OHV Trail 30 (18N78) jct. On 8 August 2001 Trough Fire burn site. MDB and M. 585 Comment
  UCD67039  Madia gracilis Ellen Dean; Davis Botanical Society 2008-5-31 5019 Colusa west of I-5 at Maxwell, Goat Mountain, ridge below summit off of Goat Mountain Road. 1734 Comment
  UCR206383  Madia gracilis George K. Helmkamp, E. A. Helmkamp 2009-5-20 14753 Colusa Inner North Coast Ranges, along CA-16, 1.8 miles north of the Yolo County line 271 Comment
  JEPS80125  Madia gracilis L. R. Heckard with J. Hickman 1980-7-1 5283 Colusa just above trail entrance to roadless area (above Summit Springs) (Summit Springs to Frog Lake, Colusa-Lake Co. boundary, ca. 10 mi w of Stonyford); Snow Mt. 1645 Comment
  JEPS83808  Madia gracilis L. R. Heckard with J. Hickman 1980-7-1 5283 Colusa just above trail entrance to roadless area (above Summit Springs) (Summit Springs to Frog Lake, Colusa-Lake Co. boundary, ca. 10 mi w of Stonyford); Snow Mt. 1645 Comment
  UCD135665  Madia gracilis Bruce G. Baldwin 1985-6-1 483 Colusa 3.2 miles north of junction with California State Highway 20 along Bear Valley Road. Comment
  CDA8257  Madia hallii Vernon H. Oswald & Lowell Ahart 1998-5-7 9012 Colusa Bartlett Springs Road 2.8 miles west of Bear Valley Road, 0.1 mile east of Sawtelle Valley and Grapevine Flat Roads. Comment
  CAS-BOT-BC206317  Malacothamnus fremontii A. A. Heller 1940-6-7 15719 Colusa Wash below the road near the foot of the grade east of Lodogo on the Sites-Lodogo Road Comment
  UCD81259  Malacothamnus fremontii Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5424 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Just north of the road leading up from the confluence of Bear and Cache Creeks. 323 Comment
  SBBG128730  Malacothamnus fremontii D. Isle, R. Isle 2013-5-22 2043 Colusa 0.1 mi W of Maxwell Grade Summit Comment
  CHSC80037  Malacothamnus helleri L. P. Janeway; Joyce Lacey-Rickert 2000-6-1 6778 Colusa Vicinity of Grapevine Creek, Hayes Canyon, and Eggman Canyon. 335 Comment
  JEPS36621  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
  CHSC27868  Malacothrix floccifera Robin Ondricek 1978-4-8 5 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. 143 Comment
  CHSC8145  Malacothrix floccifera J. G. Moore 1969-4-12 93 Colusa Hwy 20, 0.5 mi. w of junction with Hwy. 16. 228 Comment
  CHSC86522  Malacothrix floccifera B. Castro; Beth Hendrickson 2003-3-19 1393 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 243 Comment
  HSC48167  Malacothrix floccifera Thomas W. Nelson, Jane P. Nelson 1978-4-29 3931 Colusa Along Bear Valley Rd., 2 mi. from the junction with State Route 20. 366 Comment
  JEPS16207  Malacothrix floccifera Rimo Bacigalupi and Arthur Holmgren 1950-4-26 3185 Colusa just w Bear Valley (just w of base of the grade to Indian Valley (Bartlett Mt. Grade)); Inner North Coast Ranges Comment
  UCD63101  Malacothrix floccifera Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4932 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20. 348 Comment
  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
  UCD82542  Malacothrix floccifera Ellen Dean; G. Harrington, C. Thomsen,R. Wilmarth,Chiao-Yi Cheng 2009-5-20 5698 Colusa Walker Ridge. Til Jones Spring area along Walker Ridge Road. 833 Comment
  RSA669479  Malva parviflora R. R. Halse 2001-3-22 5945 Colusa Williams; along a vacant lot by 455-4th Street. 18 Comment
  SEINET7096534  Malva parviflora Richard R. Halse 2001-3-22 5945 Colusa Williams; along a vacant lot by 455 - 4th street Weedy roadside; 39 9.52N 122 8.84W (Converted to decimal degrees). Elevation 18 m. 18 Comment
  CHSC117119  Malvella leprosa B. Castro; Tom Boullion 2009-8-19 1800 F Colusa Sacramento Valley. Ca 3 air mi SE of Colusa, near Moon Bend on W bank of the Sacramento River at RM 141.4, just off Moon Bend Rd. Near main levee road. 18 Comment
  CHSC88532  Malvella leprosa B. Castro; David Grant, Aric Lester 2003-9-29 1443 Colusa Vicinity of Antelope Valley, Antelope Creek and Huffmaster Road. On SSE-facing bank in sharp bend of creek. 160 Comment
  UC1368667  Malvella leprosa L. M. Moe 1969-7-29 98 Colusa along Butte Creek ca. 3 mi. n.e. Colusa (also along rd. of Butte Creek Outing Club property); Butte Creek Comment
  UC18824  Malvella leprosa Robert Cosmer 1900-8-27 Colusa Colusa 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
  POM284892  Marah fabacea Lyman Benson 1935-3-27 6337 Colusa 2 mi W of Williams. Inner N Coast mtn range, Sacramento River watershed. 122 Comment
  UCD164045  Marah watsonii Richard Philbrook 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. Lower slopes of hill. 327 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
  CHSC84939  Marsilea vestita subsp. vestita Lowell Ahart 2003-10-23 10669 Colusa On the east strand of East Park Reservoir, about 1/8 mile northwest of Sites Lodoga Road, about 1 mile north of Lodoga, about 21 miles west of Maxwell. 368 Comment
  UC89518  Matricaria discoidea T. S. Brandegee April 1889 Colusa Colusa Junction Comment
  UCD57865  Matricaria discoidea Gordon Harrington; Diana Hickson, Jack Alderson 2007-4-29 48 a Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. South terrace of Thompson Creek about 300 feet upstream of breached dam close to Road Kill Cafe. 395 Comment
  CHSC94450  Medicago lupulina Lowell Ahart 2006-8-9 13123 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  HSC45689  Medicago polymorpha Patricia Shesgreen 1978-4-22 30 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  SEINET3287499 Image available Medicago polymorpha George K. Helmkamp, E. A. Helmkamp 2009-3-11 14361 Colusa Sacramento Valley; along CA-20, 1.6 miles southwest of Colusa and just north of Colusa National Wildlife Refuge. 15 Comment
  UCD56908  Medicago polymorpha Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3511 Colusa BLM Payne Ranch. In Craig Canyon. Southwest of intersection of Hwy. 16 and Hwy. 20. 326 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
  POM276582  Medicago polymorpha Lyman D. Benson 1933-4-16 4337 Colusa 5 miles south of Arbuckle, Sacramento River Watershed, Sacramento Valley. 91 Comment
  UCD107925  Medicago sativa Beecher Crampton 1963-8-5 6873 Colusa 3.5 miles south of Grimes. Comment
  UCD107927  Medicago sativa Beecher Crampton 1963-8-5 6874 Colusa 3.5 miles south of Grimes. Comment
  CHSC100246  Melica californica D. Isle 1988-4-13 1507 Colusa Mendocino National Forest - North Coast Ranges. Middle Fork Stony Creek Watershed. West of Fouts Springs youth facility; Approx. 1 mile west of current gate on Rd to Bathhouse Trail; East of road and E of Trout Ck Trailhead; Within fenced exclosure burned during 1987 Fouts Fire. 609 Comment
  CHSC100290  Melica californica D. Isle 1988-4-13 1513 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
  CHSC112266  Melica californica Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18639 Colusa Inner North Coast Range. North side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  CHSC79416  Melica californica B. Castro; L. P. Janeway 2000-4-10 1066 Colusa Vcinity of Sites in rolling hills near Sulphur Gap, among unnamed tributaries to Lurline Creek. 121 Comment
  CHSC86128  Melica californica Jenny Marr; Julie Cunningham, Heidi West, Caroline Warren 1998-5-27 Colusa Vicinity of Antelope Valley, Antelope Creek, and Huffmaster Road. 137 Comment
  JEPS120981  Melica californica Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18639 Colusa On N side of Hwy 20, just E of Lake County Line, 12.2 air miles ENE of town of Clear Lake, 17.1 air miles W of Williams. Comment
  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
  JEPS80810  Melica harfordii L. R. Heckard and J. C. Hickman 1981-7-31 5783 Colusa Fouts Springs Overlook Snow Mt. (e side of Snow Mt.) 1813 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
  UCR212338  Melica torreyana Craig D. Thomsen 2001-5-24 2510 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, south side of Hwy 20, c. 0.5 mi west of Hwy 20/16 intersection (between mileposts 2.17 and 2.25). 342 Comment
  POM20221  Melilotus albus Roxana Stinchfield 1916-7-9 403 Colusa Overflow land along Sacramento River, Phillips Ranch. Comment
  RSA724820  Melilotus albus L. Ahart 2006-9-26 13349 Colusa South side of the Delevan National Wildlife Refuge, north side of Maxwell Road about 3 miles west of Colusa Princeton Road, about 5 1/2 mils east of Maxwell. 24 Comment
  CHSC112256  Melilotus indicus Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18646 Colusa Inner North Coast Range. On the north side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  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
  UCD169976  Melilotus officinalis G. F. Hrusa 1999-5-16 15050 Colusa Little Stony Creek. 457 Comment
  RSA718054  Mentha arvensis L. Ahart 2006-8-9 13090 Colusa On the south side of Stony Ceek, at Mine Camp, about 3.5 miles (air) west of Stonyford. 455 Comment
  CHSC94289  Mentha canadensis Lowell Ahart 2006-8-9 13090 Colusa On the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  CHSC94453  Mentha canadensis Lowell Ahart 2006-8-9 13166 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS108913  Mentha canadensis Lowell Ahart 2006-8-9 13090 Colusa On the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford 455 Comment
  POM62477  Mentha canadensis Roxana Stinchfield 1918-7-8 382 Colusa Sycamore Slough; Stinchfield Ranch Comment
  CHSC75615  Mentzelia dispersa Vernon H. Oswald; Lowell Ahart 1999-6-22 9778 Colusa Lily Pond near upper Letts Lake west of Stonyford. 1243 Comment
  UC725296  Mentzelia dispersa A. A. Heller 1940-6-7 15718 Colusa 1 m or more e Lodogo (below the road near the foot of the grade) Comment
  SEINET199012  Mentzelia laevicaulis Helen K. Sharsmith 1953-6-21 4306 Colusa Slopes of Little Stoney Creek ca. 1 mile within boundary of Mendocino National Forest 671 Comment
  UCD163656  Mentzelia laevicaulis Craig Thomsen 1998-6-10 1954 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UC1053474  Mentzelia micrantha Rimo Bacigalupi, Arthur Holmgren 1950-4-26 3181 Colusa just w Bear Valley (Burned slope just west of base of the grade to Indian Valley(Bartlett Mt. Road)); Inner North Coast Ranges 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
  SEINET5710220  Micropus californicus Patricia Warne 1967-1 56 Colusa South end of Bear Valley by Bear Creek.; Bear Valley 390 Comment
  CHSC82608  Micropus californicus var. californicus Tara Morgan 2002-4-1 13 Colusa On the side of Bear Valley Rd. located northeast of Bear Creek south of Bear Valley. 350 Comment
  HSC47740  Micropus californicus var. californicus Thomas W. Nelson, Jane P. Nelson 1978-4-29 3946 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  HSC48198  Micropus californicus var. californicus Thomas W. Nelson, Jane P. Nelson 1978-4-29 3958 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  UC638694  Micropus californicus var. californicus Ethel Crum 1938-5-7 2011 Colusa summit of ridge 4.2 mi n Rumsey; Inner North Coast Range, Comanche Hills 254 Comment
  UC71655  Micropus californicus var. californicus Miss Alice King 1905-4-7 Colusa College City Comment
  HSC65998  Micropus californicus var. californicus D. Boyd, M. Eichelberger, Tim Messick, T. Ranker 1980-4-20 44 Colusa Leesville Rd. from Leesville to Williams, 3.8 mi. E of Leesville. Comment
  UC71639  Microseris campestris Miss Alice King 1905-1 Colusa College City Comment
  CHSC115388  Microseris douglasii subsp. douglasii Lowell Ahart 2015-4-1 19996 Colusa Near a small drainage, burned over in 2012, rocky serpentine outcrop on the north side of State Highway 20, 1/2 mile east of Lake County Line, 12 miles (air) east-northeast of Clear Lake (town), 17 miles (air) west of Williams. Inner Coast Range. 520 Comment
  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
  UCD163885  Microseris douglasii subsp. douglasii Craig D. Thomsen 2002-4-10 2598 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
  UCD57108  Microseris douglasii subsp. douglasii Gordon Harrington; Diana Hickson 2007-4-7 0021 Colusa Colusa Co. Ca. BLM Payne Ranch, SW intersection of Hwy 16 and Hwy 20, approx. 1/5 to 1/2 mile W of Roadkill Cafe on old fuel break. 442 Comment
  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
  CHSC86599  Microseris elegans Jenny Marr; Heidi West, Joyce Lacey-Rickert, Caroline Warren 1998-5-8 Colusa Vicinity of Sites and Antelope Valley. 121 Comment
  UCR261654  Microseris paludosa Ann Howald 2003-4-24 2322 Colusa Inner North Coast Ranges, Indian Valley, west side of East Park Reservoir, near Pinto Point camping area 368 Comment
  CHSC89880  Microseris sylvatica B. Castro; L. Janeway 2001-5-10 1249 Colusa Vicinity of Grapevine Creek, Antelope Creek, and Pence Mtn. Near dirt road paralleling N-S-trending perennial creek, at the blue oak-grassland edge on moderately steep E-facing slope 405 Comment
  UCD56675  Microsteris gracilis Jack Alderson 2007-3-25 11 Colusa BLM Payne Ranch. Destinella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 571 Comment
  CHSC117783  Mimetanthe pilosa David Isle 2016-7-1 2166 Colusa Sacramento Valley Foothills:~0.9 mi S of Stonyford on N edge Dennus Dr, between chip seal and fence on Isle property(~40' W of E property fenceline and ~ midway between Salt Ck and jct w/ Co Rd 306). Gilmore Peak California. 371 Comment
  JEPS80113  Mimulus breweri L. R. Heckard with J. Hickman 1980-7-1 5272 Colusa cirque se East Peak (ca. 10 mi w of Stonyford); Snow Mt. 1950 Comment
  POM21052  Mimulus cardinalis Roxana Stinchfield 1916-7-9 417 Colusa Philip's Ranch, near Sycamore. 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
  RSA535823  Mimulus douglasii David M. Thompson 1988-3-28 860 Colusa 2.0 mi W of Bear Valley Road along Bartlett Springs Road. 0.25 mi W of a road culvert for a small stream. 534 Comment
  HSC85824  Mimulus guttatus David Munger, Tallchief Comet, Jeff Dunk 1987-4-12 78 Colusa Bear Valley Comment
  JEPS80223  Mimulus guttatus L. R. Heckard and J. Hickman 1980-7-3 5380 Colusa sw slope Snow Mt. (below pipe outlet from spring); Summit Springs 1554 Comment
  JEPS80382  Mimulus guttatus L. R. Heckard and J. Hickman 1981-6-22 5615 Colusa Dark Hollow Creek Snow Mt. 1889 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
  SEINET3450718  Mimulus guttatus Unknown 2003-7-14 10383 Colusa Williams, Williams, about 21 road miles southwest, open field on the south side of highway 20, about 2 miles southwest of the intersection of highway 20 and Bear Valley Road 520 Comment
  UCD82504  Mimulus guttatus Craig Thomsen; G. Harrington 2009-5-12 2864 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  UCD82574  Mimulus guttatus Craig Thomsen 2008-6-12 2765 Colusa Bear Creek (formerly Payne) Ranch. South side of Hwy 20, ca. 0.25 mi W of Hwy 16. West and SW of the corral that is located at the junction of Hwy 16 and 20. Comment
  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
  UC1049541  Mimulus kelloggii Rimo Bacigalupi 1950-4-16 3105 Colusa vicinity Colusa-Glenn County line (ridge above Red Bridge Camp and the confluence of the North amd Middle Forks of Stony Creek); Inner North Coast Ranges, Mendocino National Forest 579 Comment
  JEPS14629  Mimulus layneae Helen K. Sharsmith 1953-6-20 4290 Colusa 5 mi beyond Trough Springs (on road to Goat Mountain); Inner North Coast Ranges, Mendocino National Forest 1280 Comment
  UC1051505  Mimulus layneae Helen K. Sharsmith 1953-6-20 4290 Colusa 5 mi beyond Trough Springs (on road to Goat Mountain); Inner North Coast Ranges, Mendocino National Forest 1280 Comment
  UC971992  Mimulus layneae Herbert L. Mason 1952-6-19 14305 Colusa Black Diamond Ridge Mendocino National Forest 609 Comment
  UCD122648  Mimulus microphyllus R. A. Christison 1960-4-17 28 Colusa on road to Wilbur Springs, 2 miles north of State Highway 20. Comment
  JEPS7899  Mimulus nudatus Milo S. Baker 1953-5-11 12651 Colusa near Lake-Colusa Line (Hiway 20) Comment
  JEPS79794  Mimulus nudatus R. F. Hoover 1941-5-2 4982 Colusa just e Lake County line (on Williams-Clear Lake highway, about 6 mi s of Wilbur Springs); Williams-Clear Lake highway Comment
  RSA296392  Mimulus nudatus Robert F. Hoover 1941-5-2 4982 Colusa Just east (about 6 miles S of Wilbur Springs) of Lake Co. line on Williams-Clear Lake Hwy Comment
  UC886310  Mimulus nudatus Alice Eastwood, John Thomas Howell 1938-5-16 5636 Colusa on road to Williams (Lake-Colusa county line) Comment
  UCD82576  Mimulus nudatus Craig Thomsen 2008-6-12 2766 Colusa Bear Creek (formerly Payne) Ranch. South side of Hwy 20, ca. 0.25 mi W of Hwy 16. West and SW of the corral that is located at the junction of Hwy 16 and 20. Comment
  JEPS120638  Mimulus pilosus Lowell Ahart 2013-10-1 19072 Colusa Strand of East Park Reservoir, about 2.5 air miles southeast of Stonyford, about 2.5 miles northwest of Lodoga, about 10 air miles northwest of Sites. Comment
  JEPS10517  Mimulus tricolor Ruth Johnson 1915-4-6 Colusa College City 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
  HSC31564  Minuartia douglasii Teresa Prendusi 1974-5-4 49 Colusa Beyond Clyde Mine 1/8 mi. 854 Comment
  UCD164031  Minuartia douglasii Indya Messier 2016-4-9 5 Colusa BLM Bear Creek Ranch (previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. South of the corral at junction of 16 and 20, at the top of hill. 504 Comment
  POM256528  Minuartia douglasii Annetta Carter 1938-5-7 1377 Colusa Comanche Hills, 4 miles N of Rumsey, Inner North Coast Range. 259 Comment
  UCD15429  Minuartia douglasii Margit Sands 1985-4-13 33 Colusa in Bear Valley, 7.4 miles north of Wilbur Hot Springs rd., a quarter of a mile form the west side of the road; 396 Comment
  CHSC92630  Minuartia nuttallii var. gregaria D. Isle 1999-7-14 1287 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. Approx. 1/3 mile below jct. 16N18/16N03 (1/4 mi. below Lake/Colusa Co. Line in Colusa Co. GPS: 10S 0522970 E 4347039 N; Spr 25' South. 1688 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
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May 16 2007
  UC1585895  Monardella odoratissima subsp. glauca Barbara Ertter 1989-7-1 8618 Colusa ca. 12 air mi wsw Stonyford (road to Goat Mt. Lookout 0.4 mi s of Rt. M-10 (Bear Creek-Fouts Spring Rd.) at head of creek); South Fork Stony Creek 1371 Comment
  CHSC92639  Monardella odoratissima subsp. odoratissima D. Isle 2005-9-14 1174 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. Meadow west of Angel Spring, Snow Mountain Wilderness. 10S 0522348E 4358185N = Angel Springs. Comment
  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
  UC2042512  Monardella villosa Holly Forbes and Barbara Keller 2011-7-7 Colusa Walker Ridge Road 6.1 miles N from its intersection with Highway 30. Comment
  CHSC94886  Monardella villosa subsp. villosa Lowell Ahart 2006-6-11 12672 Colusa On the east side of an off road trail (Trail 30), about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford. 613 Comment
  IRVC29847  Monardella villosa subsp. villosa Mark A. Elvin, David Isle, Mark S. Brunell 2006-8-3 4991 Colusa Mendocino Nat. Forest; E face of Snow Mtn., Stony Creek along M10. Southern Northern Inner Coast Ranges 610 Comment
  JEPS108809  Monardella villosa subsp. villosa Lowell Ahart 2006-6-11 12672 Colusa On the east side of an off road trail (Trail 30), about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford 613 Comment
  UCR261722  Monardella villosa subsp. villosa Ann Howald 2003-5-30 2356 A Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3 miles north of Lodoga, ridge west of Serenity camping area 373 Comment
  CAS-BOT-BC349575  Monolopia major Ethel Crum 1938-5-8 2035 Colusa Bear Valley, four miles south of Leesville 426 Comment
  UCD81240  Monolopia major Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5404 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Slopes on the north side of the canyon that is located just south of Brophy Canyon. 262 Comment
  JEPS80371  Montia fontana L. R. Heckard and J. Hickman 1981-6-22 5605 Colusa s side of east ridge of East Peak, Snow Mountain East Peak; Snow Mountain, East Peak 1950 Comment
  CHSC89832  Muhlenbergia filiformis B. Castro; L. P. Janeway, S. Innecken 2001-3-28 1213 Colusa Vicinity of Sites in rolling hills near Sulphur Gap, among unnamed tributaries to Lurline Creek, in heavily grazed annual grassland E of blue oak savanna. 91 Comment
  UC719170  Muilla maritima F. G. Meyer 1938-4-5 1346 Colusa in meadow about 20 mi n Williams Comment
  CAS-BOT-BC83282  Myosurus minimus James Jokerst 1986-5-6 2299 Colusa Near Lurline Creek. 41 Comment
  UC1101349  Myosurus minimus subsp. apus Herbert L. Mason 1953-4-5 14510 a Colusa 3 mi e of Maxwell Comment
  POM312444  Myosurus minimus var. filiformis H. L. Mason 1953-4-5 1459 Colusa 3 miles east of Maxwell Comment
  UC1028302  Myosurus sessilis George B. Rossbach 1955-4-9 271 Colusa 3 mi e Maxwell (Sacramento Valley); Sacramento Valley 18 Comment
  UC1101351  Myosurus sessilis Herbert L. Mason 1953-4-5 14508 Colusa 3 mi e of Maxwell Comment
  POM312437  Myosurus sessilis H. L. Mason 1953-4-5 14510 Colusa 3 miles east of Maxwell 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-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
  CAS-BOT-BC259753  Nassella cernua Roxana S. Ferris 1926-4-23 6399 Colusa Near Mountain House on Williams - Stonyford Road Comment
  POM174566  Nassella cernua Roxana S. Ferris 1926-4-23 6424 Colusa Summit of grade of Williams-Strongford Road Comment
  UCD72481  Nassella lepida Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3815 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
  CHSC100258  Nassella pulchra D. Isle 1988-4-13 1506 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
  UCD87672  Nassella pulchra D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley. Destanella Flat-Walker Ridge. 450 Comment
  JEPS70256  Navarretia cotulifolia W. L. Jepson 1920-5-23 8965 Colusa near Leesville (foot of Bartlett Grade, w side of Bear Valley); Bear Valley, Bartlett Grade 426 Comment
  UC856855  Navarretia cotulifolia A. A. Heller 1916-6-9 12388 Colusa about 2 mi w Leesville; Coast Range Comment
  CHSC72457  Navarretia divaricata subsp. vividior L. P. Janeway; David Isle 1998-7-3 5711 Colusa Along Pacific Ridge Road (16N06) 0.5 mi east of road to Spanish Ridge and Hough Springs; about 50 ft below ridge top on north-facing slope. 1051 Comment
  JEPS80184  Navarretia divaricata subsp. vividior L. R. Heckard with J. Hickman 1980-7-3 5336 Colusa ca 10 mi w Stonyford (just w of Summit Springs, Colusa-Lake County boundary); Snow Mt. 1548 Comment
  CHSC79544  Navarretia heterandra B. Castro; L. P. Janeway 2000-5-3 1124 Colusa Vicinity of Sites, Huffmaster Rd, and Grapevine Creek. 371 Comment
  CHSC89844  Navarretia heterandra B. Castro; L. Janeway 2001-5-2 1242 Colusa Vicinity of Grapevine Creek, Antelope Creek, and Pence Mtn. In flat to undulating open grazed grassland between hills of blue oak woodland. Adjacent to dirt road paralleling N-S-trending creek. 335 Comment
  UC908879  Navarretia heterandra Herbert L. Mason 1946-5-30 12816 Colusa near Eppersons; Bear Valley Comment
  JEPS81285  Navarretia intertexta L. R. Heckard and J. C. Hickman 1982-7-5 5896 Colusa Summit Springs, south side of Snow Mt. 457 Comment
  JEPS80763  Navarretia intertexta L. R. Heckard and J. C. Hickman 1981-7-30 5730 Colusa 182 Comment
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May 28 2012
  CHSC69683  Navarretia intertexta subsp. intertexta Vernon Oswald 1984-7-23 1617 Colusa Lily Pond near Letts Lake in Mendocino National Forest. On a road along the edge of a meadow. 1280 Comment
  CAS-BOT-BC230316  Navarretia jepsonii Katharine Brandegee 1916-8-10 s.n. Colusa Bear Valley, near Eppersons Comment
  CHSC84247  Navarretia jepsonii Lowell Ahart 2003-7-14 10385 Colusa 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
  JEPS105730  Navarretia jepsonii David Gowen 2004-5-18 81 Colusa About 1.5 miles southeast of Stonyford at East Park Resevoir. Northwestern end, .3 mile SW of the dam that drains to Little Sony Creek. 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
  UCR261754  Navarretia jepsonii Ann Howald 2003-5-31 2360 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3 miles north of Lodoga, ridge west of Serenity camping area 373 Comment
  CAS-BOT-BC230318  Navarretia jepsonii A. A. Heller 1940-6-7 15709 Colusa 7 miles N of Stonyford Comment
  CAS-BOT-BC230339  Navarretia leucocephala subsp. bakeri Niall McCarten 1985-5-6 5111 Colusa S side of Standard road, 0.2 mile W of Mills Orchards Road NW of Williams Comment
  UC963802  Navarretia leucocephala subsp. leucocephala Herbert L. Mason 1945-7-11 12646 Colusa 3 mi above Colusa (Butte Lodge Outing Club, Butte Creek); Butte Creek Comment
  UCD72392  Navarretia mellita Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5118 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
  UC584174  Navarretia pubescens J. Clausen 1935-5-20 1014 Colusa 18 mi w Williams (on Bartlett Springs road) Comment
  UCD72461  Navarretia pubescens Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3795 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. Near north end of bridge, west side of creek. 281 Comment
  CHSC107485  Navarretia sinistra subsp. pinnatisecta David Isle; John Whittlesey 2009-7-11 1917 Colusa Mendocino National Forest - North Coast Ranges Middle Fork Stony Creek Watershed. Snow Mtn. Wilderness; Summit Springs Trail; Near Jeffrey Pine stand and 1987 Fouts Fire JP Snag. [Trail straddles Lake and Colusa County lines] 1645 Comment
  JEPS105729  Navarretia tagetina David Gowen 2004-5-18 83 Colusa About 1.5 miles southeast of Stonyford at East Park Resevoir. Northwestern end, 1/3 mile W of the dam that drains to Little Stony Creek. 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
  RSA537450  Nemacladus capillaris Barbara Ertter 1989-7-1 8599 Colusa Road to Goat Mt Lookout 2.2 miles S of Rt M-10 (Bear Creek-Fouts Spring Rd) at head of S Fk Stony Creek, ca 12 airmiles WSW of Stonyford. 1500 Comment
  UCD63119  Nemacladus montanus Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4949 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20. 405 Comment
  UCD169730  Nemophila heterophylla Richard R. Halse 2013-3-26 8738 Colusa Along the Leesville Road ca. 5.6 miles northwest of its junction with State Hwy. 20, west of Williams. 157 Comment
  UCR206667  Nemophila heterophylla George K. Helmkamp, E. A. Helmkamp 2009-3-17 14396 Colusa Inner North Coast Ranges Foothills, along CA-16 and Bear Creek, 7.0 miles south of the junction with CA-20; just north of the Yolo County line 194 Comment
  CHSC70890  Nemophila menziesii var. menziesii Vernon Oswald; Lowell Ahart 1998-4-21 8949 Colusa Rd. 401 1.8 mi north of Grapevine Pass on the Sites-Lodoga Rd. 472 Comment
  JEPS85842  Nemophila parviflora var. parviflora Barbara Ertter 1989-7-1 8614 Colusa ca 12 air mi wsw Stonyford (road to Goat Mt. Lookout, at bend in road, 1.7 mi s of Rt M-10 (Bear Creek-Fouts Spring Rd), at head of South Fork of Stony Creek); South Fork of Stony Creek, rd to Goat Mt. Lookout 1463 Comment
  CHSC86958  Nemophila pedunculata Beth Hendrickson; Jenny Marr 1999-2-18 Colusa Vicinity of Funks Creek, Antelope Valley, and Sites. 158 Comment
  UC595048  Nemophila pedunculata Annetta Carter 1938-5-8 1381 Colusa 6.6 mi s Lodoga; s of Lodoga Comment
  CHSC62851  Nicotiana glauca Vernon H. Oswald; Lowell Ahart 1994-3-23 6024 Colusa Goat Mtn. Rd. 1.8 mi W of Stonyford-Lodoga Rd., S of Stonyford. Between the road and Little Stony Creek. 487 Comment
  RSA140854  Nicotiana glauca John H. Thomas 1960-8-29 8846 Colusa About 11 miles SW of Williams along Hwy 20. Comment
  UC34994  Nicotiana quadrivalvis J. Burtt Davy May 1898 4304 Colusa near Princetown Comment
  UCD82571  Oemleria cerasiformis Craig Thomsen 2008-6-12 2762 Colusa Walker Ridge, vicinity of Elgin Mine. Lucientes Property. 655 Comment
  UC1229784  Orobanche bulbosa G. Newcomb, F. Chisaki 1958-6-23 1165 Colusa North Coast Range, on John Smith Road John Smith Road; North Coast Range, John Smith Road Comment
  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
  SEINET8854072 Image available Orobanche grayana var. jepsonii H. P. Chandler 1905-1 s.n. Colusa Princeton Comment
  POM298007  Orthocarpus lithospermoides var. bicolor A. A. Heller 1919-5-10 13116 Colusa W of Leesville. Comment
  SEINET10549700  Orthocarpus lithospermoides var. bicolor Mary Susan Taylor, E. Pierce 1981-5-17 Taylor 3757 Colusa On E side of Lodoga-Stonyford Rd, in wet meadow of Valley Grassland, ca. 1 mi S of Stonyford. 1100 ft. 335 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
  RSA430221  Orthocarpus purpurascens var. purpurascens Eugene Tanimoto 1975-4-20 13 Colusa Bear Valley Road, 8.7 miles north of State Highway 20. Comment
  JEPS105741  Packera clevelandii David Gowen 2004-6-24 134 Colusa South of Stonyford. Approx. 1.8 miles along Goat Mt. Road from its junction with the paved road to Stonyford. Comment
  UCD110420  Packera clevelandii Daniel Slakey; CNPS volunteers 2011-6-12 6 Colusa Walker Ridge. Wet meadow area on E side of Walker Ridge Rd. About 18 km N of Hwy.20 by road. 876 Comment
  UCD133496  Packera clevelandii D. Sanchez-Mata 1998-7-10 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain Road between Lodoga and Red Rock Cabin. 420 Comment
  UCD163313  Packera eurycephala Craig D. Thomsen 1997-4-13 1902 Colusa Bear Valley. About 6 miles north of Hwy 20. Vicinity of Trout Creek, north of Deadshot Canyon. 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
  JEPS118687  Packera eurycephala var. eurycephala David Isle 2011-5-8 1902 Colusa E of Isle home, concen. W of E fenceline. 2253 Dennis Dr, Stonyford in W 5 Ac of S 1/2 of NW 1/4 of SW 1/4 of SE 1/4. Gilmore Peak 7.5' quad. Comment
  SFV12205  Packera eurycephala var. eurycephala J. M. Tucker 1968-5-4 4108 Colusa Bear Valley, open valley floor, 8.6 miles (by road) northwest of junction of Bear Valley Road and State Highway 20. 396 Comment
  CHSC106247  Packera greenei B. Castro; L. P. Janeway 2001-6-3 1258 C 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. 883 Comment
  UC1543129  Packera greenei Donald G. Nelson 1940-6-9 Colusa w of Stoneyford Road to Snow Mountain area (road to Bonnie View) Comment
  UCD82522  Packera greenei Craig Thomsen; G. Harrington 2009-5-12 2879 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
  CHSC94428  Panicum capillare Lowell Ahart 2006-8-22 13222 Colusa South side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford. 349 Comment
  UC1101588  Panicum capillare Herbert L. Mason 1945-9-19 12719 Colusa 1 mi above Colusa (below causeway over Butte Sink spillway, e bank Sacramento River); e bank Sacramento River, Butte Sink Comment
  POM166124  Parietaria pensylvanica Roxana Stinchfield 1916-7-8 378 Colusa Stinchfield Ranch, along Sycamore Slough Comment
  UC1027193  Parvisedum pentandrum Herbert L. Mason 1953-5-4 Colusa Little Stony Creek Road 0.25 mi above junction of Little Stony Creek and Trout Creek (Inner North Coast Ranges); , Little Stony Creek Road 609 Comment
  RSA724980  Paspalum distichum L. Ahart 2006-9-26 13352 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
  UCD67080  Paspalum distichum Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5104 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
  UCD88913  Paspalum distichum C. F. Dunshee 1942-1 2 Colusa Rice fields. Comment
  UC1613496  Pectocarya penicillata Charles M. Belshaw 1937-4-25 2840 Colusa vicinity of Cook's Spring (Inner North Coast Ranges, Devil's Ridge); Inner North Coast Ranges, Devil's Ridge 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
  CHSC77919  Pectocarya pusilla Beth Hendrickson; Jean Witzman 1999-4-21 Colusa Vicinity of Antelope Valley and Sites. 137 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
  UCD66581  Pediomelum californicum Craig D. Thomsen 2001-5-24 2526 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
  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
  CHSC43542  Pellaea andromedifolia Lowell Ahart 1976-11-14 1003 Colusa About 3 miles west of Sites. 365 Comment
  CHSC46033  Pellaea mucronata Lowell Ahart 1976-11-14 1004 Colusa On the north side of the Sites Lodoga Road, about 3 miles north-west of Sites. 365 Comment
  CAS-BOT-BC77156  Pellaea mucronata subsp. mucronata Josh Suchocki; Charlene Vullo; Kyle Wear 1995-4-1 39 Colusa Along Brim Rd. 1.6 miles west of the junction with Bear ValleyRd. (Robber's Flat) 487 Comment
  HSC47602  Penstemon azureus J. P. Smith, J. O. Sawyer 1978-4-29 9797 Colusa Bear Valley Rd., 5.9 mi. from its junction with Hwy. 20 366 Comment
  UCD57661  Penstemon heterophyllus Madeline Christopher; with Plant Biology 102 2007-4-29 3 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Eastern/Central part of ranch. Craig Canyon. North side of unimproved road. 335 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
  UCD72388  Penstemon heterophyllus var. australis Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5114 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
  NY601769  Penstemon heterophyllus var. purdyi L. Constance 1938-4-22 2148 Colusa Above Salt Creek, Lower Lake-Williams road, 11 miles northeast of Lake-Colusa line, Inner North Coast Ranges. 152.4 Comment
  CDA20255  Penstemon heterophyllus var. purdyi G. D. Barbe, Nola Parmer 1982-6-4 3636 B Colusa North Coast Ranges; Goat Mountain Rd, w of Lodoga-Stonyford Rd, Mendocino National Forest. 0 Comment
  NY601742  Penstemon heterophyllus var. purdyi J. C. Clausen 1935-5-20 1015 Colusa 18 miles west of Williams on the Bartlett Springs road. Comment
  UCD124198  Penstemon purpusii A. M. Shapiro 1994-6-12 s.n. Colusa at road junction just below summit of Goat Mountain. Comment
  JEPS94162  Pentachaeta exilis Vernon Oswald and Lowell Ahart 1998-4-21 8947 Colusa bordering Goat Mt. Rd. 0.2 mi. s.w. of Stonyford-Lodoga Rd. 390 Comment
  CDA8447  Pentachaeta exilis N. van Kleeck, Willa May Lowary 1970-4-18 Colusa Bear Valley, just south of Ladoga. 0 Comment
  HSC66133  Pentagramma triangularis Teri Bartowski, Shane Feusier, Ruth Takaki, Carol Zimmerer 1980-4-19 37 Colusa Bartlett Springs Rd. at stream crossing. Comment
  UCD63109  Perideridia kelloggii Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4940 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20. 351 Comment
  UCD82501  Perideridia kelloggii Craig Thomsen; G. Harrington 2009-5-12 2860 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  UCR281727  Perideridia kelloggii David Isle, Frank Pendell 2014-6-16 2135 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
  UCD99462  Persicaria lapathifolia C. F. Dunshee 1922-1 s.n. Colusa Rice fields. Comment
  UCD99498  Persicaria lapathifolia June McCaskill 1954-8-9 356 Colusa ca. 2 miles east of Princeton and 300 yards south of Glenn County line. Comment
  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
  CHSC94459  Persicaria punctata Lowell Ahart 2006-8-9 13133 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UCD72534  Petrorhagia dubia Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3825 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. West side of Bear Creek, ca. 0.5 mile downstream of bridge. 246 Comment
  CDA15464  Phacelia corymbosa G. F. Hrusa, WTD 1998-6-19 14601 Colusa North Coast Ranges; Above Little Stony Creek. Goat Mtn. Rd. ~ 1 km. W of intersection with Lodoga-Stonyford Rd. Comment
  CDA16098  Phacelia corymbosa G. F. Hrusa 1999-5-16 15045 Colusa North Coast Ranges; Above Fouts Springs. 594 Comment
  UCR212377  Phacelia divaricata Ellen Dean, Craig D. Thomsen, N. Voegtly, J. Alderson, Gordon Harrington 2008-3-30 4668 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Slopes to the NW of Cowboy Camp on the west side of Bear Creek 358 Comment
  CHSC12748  Phacelia egena L. V. Ritter 1969-4-30 227 Colusa Ca 10 mi. sw of Williams, s side of Highway 20. Comment
  CHSC77938  Phacelia egena Beth Hendrickson; B. Castro, L. P. Janeway, Mary Ann Griggs 1999-4-12 Colusa Vicinity of Logan Ridge and Golden Gate. 158 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
  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
  UC1613497  Phacelia imbricata Charles M. Belshaw 1937-4-25 2892 Colusa vicinity of Cook's Spring Inner North Coast Range, Devil's Ridge 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
  UCD66695  Phacelia imbricata Craig D. Thomsen 2000-6-23 2381 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UC901839  Phacelia imbricata subsp. imbricata L. Constance, R. Bacigalupi, C. R. Bell, and A. H. Holmgren 1950-4-26 3322 Colusa ridge between Bear Valley and Indian Valley (near Colusa-Lake Co. line) 609 Comment
  UC1228287  Phacelia imbricata subsp. imbricata L. R. Heckard and C. R. Bell 1951-6-13 175 Colusa at base of cliff just n Stonyford Comment
  UC1051793  Phacelia mutabilis L. R. Heckard and C. R. Bell 1951-6-13 170 Colusa n slope of mt. Mendocino National Forest, Goat Mountain (ne of Bartlett Springs, along road from Bear Creek to Fouts Springs) Comment
  HSC44464  Phacelia tanacetifolia R. York 1978-4-22 141 Colusa Bear Valley Rd., 1.5 mi. from its junction with S.R. 20 409 Comment
  HSC45748  Phacelia tanacetifolia Stephen Plant 1978-4-23 228 Colusa 2.5 mi. from Hwy. 20 on bear Valley Rd. 419 Comment
  POM163459  Phacelia tanacetifolia Roxana S. Ferris 1926-4-23 6407 Colusa Grade beyond the Mountain House on the Williams-Stonyford Road. Comment
  UC765521  Phacelia tanacetifolia R. F. Hoover 1938-4-24 3230 Colusa below Sites; Stone Corral Canyon 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
  UCD67073  Phalaris aquatica Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5100 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. 488 Comment
  UCD88339  Phalaris brachystachys Beecher Crampton 1961-7-20 5936 Colusa 8 miles SE of Grimes. Comment
  CAS-BOT-BC259026  Phalaris lemmonii Alice Eastwood 1922-4-24 11195 Colusa Road between Princeton & Norman Comment
  CAS-BOT-BC265957  Phalaris minor Roxana S. Ferris 1926-4-22 6287 Colusa 3 miles west of Colusa Comment
  JEPS71108  Phlox gracilis Alice King May 1906 Colusa College City Comment
  UC1051738  Phlox gracilis Helen K. Sharsmith 1953-6-20 4293 Colusa Goat Mountain summit, Lake-Colusa boundary Inner North Coast Ranges, Mendocino National Forest 1864 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
  CHSC20708  Phoradendron densum Robert A. Schlising; Glenn Keator 1962-1-31 2033 Colusa 426 Comment
  JEPS80199  Phoradendron libocedri L. R. Heckard and J. Hickman 1980-7-3 5354 Colusa n. side of rd. across from Summit Springs (Snow Mt., Colusa-Lake Co. boundary); Snow Mt. Comment
  RSA0115434  Phoradendron macrophyllum George K. Helmkamp, Elizabeth Helmkamp 2014-1-4 22508 Colusa Sacramento Valley: along CA-20 at the junction with Alameda Court, 0.2 mile west of the Sacramento River crossing at Meridian. 20 Comment
  JEPS80242  Phoradendron villosum L. R. Heckard and J. Hickman 1980-7-3 5403 Colusa near Summit Springs (Snow Mt.); Snow Mt. Comment
  JEPS106503  Phragmites australis L. P. Janeway, B. Castro 2001-6-3 7098 Colusa Inner North Coast Ranges. Spring at Grapevine Flat, on top of Walker Ridge about 0.8 km east of Baldy Mountain 884 Comment
  UC1124395  Phyla caespitosa H. S. Yates 1936-8-14 6134 Colusa 3 mi S of Colusa 15 Comment
  UCD58166  Phyla nodiflora Gordon Harrington 2007-5-15 56 Colusa BLM Payne Ranch. Sandy north side of Cache Creek, about 1/2 mile upstream from the confluence of Cache Creek and Bear Creek. 190 Comment
  UCD81734  Pickeringia montana Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5736 Colusa Walker Ridge. Along Walker Ridge Road, just S of turn off to Indian Valley Reservoir. 840 Comment
  CHSC94393  Piptatherum miliaceum Lowell Ahart 2006-8-9 13121 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UCD84557  Piptatherum miliaceum Ellen Dean; C. Thomsen, G. Harrington, Davis Botanical Society 2010-6-5 6082 Colusa Walker Ridge. Along Walker Ridge Road on southern part of the ridge, south of turnoff to Indian Valley Reservoir. 683 Comment
  CHSC29710  Plagiobothrys bracteatus K. R. Stern 1980-6-1 6636 Colusa Vernal pool, south central border area of Colusa National Wildlife Refuge. 45 Comment
  UCD15421  Plagiobothrys collinus var. californicus Margit Sands 1985-4-13 23 Colusa in Bear Valley, 3.8 miles north of Wilbur Hot Springs rd. 390 Comment
  CAS-BOT-BC478200  Plagiobothrys distantiflorus Ann Howald 2003-3-25 2286 Colusa Inner Coast Ranges: Indian Valley, west side of East Park Reservoir, c. 2.1 miles southeast of Stonyford, near diversion canal inflow to reservoir 369 Comment
  CHSC79099  Plagiobothrys fulvus B. Castro 2000-3-17 1040 Colusa Vicinity of Sites, Antelope Valley, and Huffmaster Rd. 182 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
  CHSC55677  Plagiobothrys humistratus K. R. Stern 1980-5-5 6625 Colusa Vernal pool, south central border area of Colusa National Wildlife Refuge. 45 Comment
  UC78155 Image available Plagiobothrys humistratus Katharine Brandegee 1888-4 Colusa Colusa Junction Comment
  CHSC31259  Plagiobothrys leptocladus R. A. Schlising; K. R. Stern 1980-5-5 3580 Colusa Southwest of Colusa, at Colusa National Wildlife Refuge; southwest cornerof refuge, north of Ware Road, in dried flats. 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
  CHSC81234  Plagiobothrys nothofulvus Caroline Warren; Jenny Marr, Heidi West, Joyce Lacey-Rickert, Julie 1998-4-14 Colusa Vicinity of Grapevine Creek and Sites-Lodoga Road. 137 Comment
  SEINET3152906  Plagiobothrys nothofulvus M. A. King 1905-4-7 D Colusa College city Comment
  HSC99265  Plagiobothrys nothofulvus D. R. Junell 1965-4-18 20 Colusa 2 mi. E on Hwy. 16 from junction with Hwy. 20 Comment
  UCD120895  Plagiobothrys nothofulvus David V. Glover 1960-4-14 50 Colusa Cache Creek, State Highway 16, 10 miles north of Rumsey. Comment
  CHSC89828  Plagiobothrys scriptus B. Castro; L. Janeway 2001-5-2 1243 Colusa Vicinity of Grapevine Creek, Antelope Creek, and Pence Mtn. In flat to undulating open grazed grassland between hills of blue oak woodland. Adjacent to dirt road paralleling N-S-trending creek. 335 Comment
  CHSC89859  Plagiobothrys scriptus B. Castro; L. P. Janeway, S. Innecken 2001-3-28 1212 Colusa Vicinity of Sites in rolling hills near Sulphur Gap, among unnamed tributaries to Lurline Creek, in heavily grazed annual grassland E of blue oak savanna. 91 Comment
  RSA10708  Plagiobothrys stipitatus C. B. Wolf 1928-5-8 2123 Colusa Sacramento Valley. 3 mi. S of Arbuckle Comment
  UC78205  Plagiobothrys stipitatus K. Brandegee Apr 1889 Colusa Colusa Junction 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
  CHSC114995  Plagiobothrys stipitatus var. micranthus Lowell Ahart 2015-4-28 20115 Colusa North side of Maxwell-Colusa Road, about 5 1/2 miles east of Maxwell. 53 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
  JEPS123890  Plagiobothrys stipitatus var. micranthus Lowell Ahart 2015-4-28 20115 Colusa About 5 1/2 miles east of Maxwell. Comment
  SD27804  Plagiobothrys stipitatus var. micranthus Carl B. Wolf 1928-5-8 2123 Colusa 3.0 miles south of Arbuckle. 42 Comment
  SEINET3287497 Image available Plagiobothrys stipitatus var. micranthus George K. Helmkamp, E. A. Helmkamp 2009-3-11 14359 Colusa Sacramento Valley; along CA-20, 1.6 miles southwest of Colusa and just north of Colusa National Wildlife Refuge. 15 Comment
  UCD163319  Plagiobothrys stipitatus var. micranthus Craig D. Thomsen 1997-4-20 1914 Colusa Bear Valley. About 6 miles north of Hwy 20. Comment
  UCD63008  Plagiobothrys stipitatus var. micranthus Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4661 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
  UCD64512  Plagiobothrys stipitatus var. micranthus Craig D. Thomsen 2000-4-12 2097 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
  UCD66938  Plagiobothrys stipitatus var. micranthus Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5087 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
  JEPS61053  Plagiobothrys stipitatus var. stipitatus Alice King May 1906 Colusa College City Comment
  UCR212375  Plagiobothrys stipitatus var. stipitatus Ellen Dean, Craig D. Thomsen, N. Voegtly, J. Alderson, Gordon Harrington 2008-3-30 4662 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Near corral on west side of Bear Creek just south of Hwy 20 320 Comment
  CHSC89837  Plantago coronopus B. Castro; L. Janeway, S. Innecken 2001-5-9 1252 Colusa Vicinity of Grapevine Creek, Antelope Creek, and Andys Canyon. Near dirt road paralleling N-S-trending perennial creek. 367 Comment
  RSA783305  Plantago elongata R. R. Halse 2010-3-20 7828 Colusa Williams. By junction of 5th Street and B Street. 25 Comment
  SD225882  Plantago elongata Carol Witham, Jennifer Buck and Vernal Pool Team 2001 2001-4-30 153 Colusa 2 mi south of the town of Colus along Hwy 20, east of Hwy 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001, UTMs: 10S0587786;4336302 Comment
  CAS-BOT-BC366913  Plantago erecta Richard R. Halse 2013-3-27 8761 Colusa Along State Hwy. 20 just east of the Colusa/Lake County Line, ca. 14.6 miles E of the junction of State Hwys. 20 and 53 558 Comment
  CHSC112257  Plantago erecta Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18632 Colusa Inner North Coast Range. On the north side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  SEINET8665581  Plantago erecta R. R. Halse 2013-3-27 8761 Colusa Along State Hwy. 20 just east of the Colusa/Lake County Line, ca 14.6 miles east of the junction of state Hwys. 20 and 53 558 Comment
  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
  CHSC113049  Plantago major Lowell Ahart 2013-10-1 19094 Colusa Inner North Coast Range. Strand of East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  CHSC23473  Platystemon californicus S. R. Poe 1974-3-30 29 Colusa In fields adjacent to highway 20, 22.5 mi. w of williams. Comment
  CHSC79537  Platystemon californicus Simona Altman 1999-4-3 53 Colusa Bear Valley, Bear Valley Rd. 396 Comment
  HSC83345  Platystemon californicus Robin Brooks 1975-4-20 31 Colusa Bear Valley Rd., 8.7 mi. N of State Hwy. 20 Comment
  HSC72768  Platystemon californicus J. Krajanowski 1981-4-4 3 Colusa .3 mi. W of junction of Hwy. 20 and Hwy. 16, S side of Bear Creek, 18 mi. SW of Williams 322 Comment
  SEINET12089320  Platystemon californicus Unknown 1978-1 9 Colusa ca 0.3 mi W of jct of Hwys. 20 and 16, S side of Bear Creek, ca 18 mi SW of Williams. Wilbur 322 Comment
  SEINET12091628  Platystemon californicus C. L. Eddy 1984-1 5 Colusa Ca 0.3 mi W of jct of Hwys 20 and 16, S side of Bear Creek, ca 16 m SW of Williams. Wilbur Springs 322 Comment
  UCD13217  Platystemon californicus Steve Daniel 1986-4-13 10 Colusa California. Colusa Co. Bear Valley, 7.6 mi No of jct of Bear Valley Rd. and hwy 20. Elev. ca. 1300 ft. 396 Comment
  UCD67939  Platystemon californicus D. Rhode 1977-4-30 2 Colusa 0.6 mi. W. Bear Creek, pasture near roadside. 403 Comment
  UCD96066  Platystemon californicus Linda Osbourne 1980-4-12 12 Colusa 0.3 mile west of junction of Highways 20 and 16, south side of Bear Creek, 16 miles SW of Williams. 321 Comment
  UCD56915  Plectritis ciliosa Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3518 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. In Craig Canyon. 318 Comment
  JEPS81274  Plectritis congesta L. R. Heckard and J. C. Hickman 1982-7-5 5884 Colusa below (south of) Summit Spring (s side of Snow Mountain); Snow Mountain 1500 Comment
  CHSC86883  Plectritis macrocera B. Castro; Beth Hendrickson 2003-3-24 1400 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 268 Comment
  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
  UC1053421  Plectritis macrocera Rimo Bacigalupi, Arthur Holmgren 1950-4-26 3171 Colusa 7.7 mi w of Sites (Grapevine Grade to Lodoga); Grapevine Grade Comment
  UC999822  Plectritis macrocera S. C. Dyal, A. Carter, E. Crum 1938-5-7 696 Colusa south central Colusa County Comment
  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
  CHSC115384  Poa bulbosa Lowell Ahart 2015-4-1 19991 Colusa Burned over in 2012, rocky serpentine outcrop on the north side of State Highway 20, 1/2 mile east of Lake County Line, 12 miles (air) east-northeast of Clear Lake (town), 17 miles (air) west of Williams. Inner Coast Range. 520 Comment
  CHSC35776  Poa bulbosa Gail B. Phillips 1982-3-27 3 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. 143 Comment
  HSC41006  Poa bulbosa J. P. Smith, Thomas W. Nelson 1976-4-14 8579 Colusa Mendocino National Forest, confluence of Stony Creek and N Fork of Stony Creek. 427 Comment
  UCD90600  Poa bulbosa Tom Aldrich 1963-4-26 s.n. Colusa Colusa. Comment
  UCD90657  Poa bulbosa Beecher Crampton 1975-4-21 9171 Colusa 3.5 miles northwest of Lodoga. Comment
  UCD97127  Poa bulbosa Ellen Dean; G. Harrington, J. Alderson 2011-4-10 6911 Colusa Along Bear Valley Road at the Cal Fire station. 335 Comment
  CHSC101409  Poa leptocoma subsp. leptocoma David Isle 1990-6-6 1530 Colusa From Lower Summit Valley below Rock Outcrop w of Rd 17N10. 1682 Comment
  UCD163685  Poa secunda Craig Thomsen 1999-4-15 1986 Colusa Bear Valley. About 5 miles north of Hwy 20, west of Bear Valley Rd. Comment
  CHSC112213  Poa secunda subsp. secunda Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18643 Colusa Inner North Coast Range. On the north side of State Highway 20, just east of Lake County Line, 12.2 mile (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  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
  JEPS62433  Pogogyne douglasii W. L. Jepson 1920-5-23 8966 Colusa near Leesville, foot of Bartlett grade, west side of Bear Valley, w Colusa Co. 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
  JEPS104398  Polygonum amphibium var. emersum Lowell Ahart 2003-10-23 10656 Colusa In East Park Reservoir, ca 1/8 mi nw of Sites Lodoga Rd, ca 1 mi n of Lodoga, ca 21 mi w of Maxwell. 368 Comment
  CDA22742  Polygonum amphibium var. emersum P. Steinbaugh, Goodwin 1932-10-1 Colusa Near Grand Island. 0 Comment
  CHSC85960  Polygonum aviculare Jenny Marr; Caroline Warren 1998-5-4 Colusa Vicinity of Sites, Stone Corral Creek, and Antelope Valley. 106 Comment
  CHSC86836  Polygonum aviculare Jenny Marr; Heidi West, Caroline Warren, Natalie Wight 1998-6-11 Colusa Vicinity of Funks Creek, Logan Ridge, Golden Gate, and Antelope Valley. 121 Comment
  JEPS75752  Polygonum parryi L. R. Heckard and R. Bacigalupi 1976-9-6 4433 Colusa just e Fouts Camp; Snow Mt. 1859 Comment
  JEPS75839  Polygonum sawatchense subsp. sawatchense L. R. Heckard 1974-9-11 3949 Colusa just nw rocky promontory overlooking Fouts Spring 1798 Comment
  UC1299697  Polygonum sawatchense subsp. sawatchense Freed W. Hoffman 1948-6-27 2528 Colusa 8.6 mi sw Fouts Spring (w Colusa Co.); Upper Letts Valley 1310 Comment
  UC821244  Polypogon maritimus Roxana Stinchfield 1916-6-17 287 Colusa near College City (Tule); Tule Comment
  CHSC107982  Polypogon monspeliensis B. Castro; L. Janeway 2011-4-27 1865 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; approximately 1 mi southeast of Funks Reservoir and 800 ft northeast of Tehama-Colusa Canal. Around edges of alkaline flat off northwest corner of large +/- alkaline marsh. 49 Comment
  CHSC94319  Polypogon monspeliensis Lowell Ahart 2006-8-9 13107 Colusa On the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  JEPS75871  Polystichum imbricans subsp. imbricans L. R. Heckard 1974-9-9 3857 Colusa ca. 1/4 mi se Foutch Camp; Snow Mt. 1828 Comment
  CHSC116671  Polystichum munitum Lowell Ahart; John Dittes, Joseephine Guardino 2016-2-14 20720 Colusa On the east side of the gravel road, about 1/2 mile north of Letts Lake, about 1/2 mile south of the large campground, about 13 miles (air) southwest of Stonyford. 966 Comment
  JEPS127193  Polystichum munitum Lowell Ahart, John Dittes, Josephine Guardino 2016-2-14 20720 Colusa About 1/2 mile north of Letts Lake, about 1/2 mile south of the large campground, about 13 miles (air) southwest of Stonyford. Comment
  UCD81888  Potamogeton nodosus Ellen Dean; Bear Creek Ranch Grazing Committee 2009-6-19 5772 Colusa BLM Bear Creek (formerly Payne) Ranch. Lands to the SW of the junction of Hwys 16 and 20. Central part of ranch at large stock pond. 492 Comment
  CAS-BOT-BC453905  Potamogeton pectinatus Milo S. Baker 1946-9-3 11576 Colusa Between Sacramento and Colusa along Hiwy. 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
  UCD122109  Proboscidea louisianica subsp. louisianica Rimo Bacigalupi; L R. Heckard 1951-8-6 3471 Colusa along road between Sites and Lodoga, 4.6 mi. N.W. of Sites. Comment
  JEPS101449  Proboscidea lutea Dean W. Taylor 1999-8-10 17295 Colusa 1 mile South of Williams, field between Interstate 5 and Delphos Road (old highway), 150 meters southeast of Husted Road freeway overcrossing 29 Comment
  JEPS24495  Proboscidea lutea J. H. Thomas 1960-8-29 8847 Colusa along Hwy 20 about 11 mi sw Williams 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
  JEPS110103  Pseudognaphalium luteoalbum Lowell Ahart 2006-8-9 13125 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  UCD36225  Psilocarphus brevissimus Beecher Crampton 1953-4-29 1146 Colusa 3 miles east of Maxwell. Comment
  JEPS40460  Psilocarphus brevissimus var. brevissimus W. L. Jepson 1934-5-3 16598 Colusa College City 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
  CHSC89836  Psilocarphus oregonus B. Castro; L. Janeway, S. Innecken 2001-5-9 1251 Colusa Vicinity of Grapevine Creek, Antelope Creek, and Pence Mtn. Near dirt road paralleling N-S-trending perennial creek. 367 Comment
  CAS-BOT-BC361875  Psilocarphus tenellus Roxana S. Ferris 1917-4-19 692 Colusa Sycamore Slough 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
  UC71968  Psilocarphus tenellus Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  CHSC80346  Psilocarphus tenellus var. tenellus Caroline Warren; Joyce Lacey-Rickert 1998-5-8 Colusa Vicinity of Sites and Antelope Creek. 91 Comment
  JEPS80462  Pteridium aquilinum var. pubescens Alice Q. Howard 1972-7-10 3 Colusa trail from Fouts Camp to Box Springs (n side of ridge separating Trout and Paradise Creeks); Snow Mt 1676 Comment
  CHSC112221  Pterostegia drymarioides Lowell Ahart 2013-5-1 18669 Colusa On the east side of Bear Valley Road, about 2 1/2 miles (by road) northwest of the intersection of State Highway 20 and Bear Valley Road. 533 Comment
  CHSC79550  Pterostegia drymarioides B. Castro; L. P. Janeway 2000-5-2 1120 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 231 Comment
  UC1738833  Puccinellia simplex Dean W. Taylor 1988-3-24 9462 Colusa Colusa National Wildlife Refuge, on Ohm Road ca. 0.5 miles North of Ware Road 24 Comment
  UCD92227  Puccinellia simplex Beecher Crampton 1958-5-19 4824 Colusa Colusa County, 3 miles south of Maxwell, along U.S. Highway 99W. 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
  UCD169984  Quercus berberidifolia G. F. Hrusa; Dmitri Geltman 1999-8-18 15251 Colusa Goat Mtn. Rd., about 1/4 mi W of Pine Flat camp. 426 Comment
  UCD83633  Quercus berberidifolia Fanny Ye; with PLB 102 class 2010-5-2 4 Colusa East slope of Walker Ridge. Along Brim Road, between Bear Valley and Walker Ridge. 493 Comment
  CHSC90879  Quercus chrysolepis D. Isle 2003-6-25 215 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. 1767 Comment
  UCD144417  Quercus chrysolepis G. F. Hrusa 1998-10-28 14897 Colusa Inner North Coast Ranges. Above Fouts Springs. Through Springs Road mile 2.7. 750 Comment
  CAS-BOT-BC86602  Quercus douglasii Roxana Stinchfield 1916-6-18 302 Colusa near College City Comment
  SBBG25340  Quercus douglasii S. C. Schank 1960-4-10 40 Colusa several hundred feet from river, Bear Valley Comment
  UC993119  Quercus douglasii J. M. Tucker 1948-9-22 1869 Colusa 11.3 mi w Williams (beside road to Venado) Comment
  UC993122  Quercus douglasii J. M. Tucker 1948-9-22 1869 Colusa 11.3 mi w Williams (beside road to Venado) Comment
  UCD13383  Quercus durata Charles Martin 1986-5-17 31 Colusa 5.7 miles west of Stonyford, along Foot Springs Rd. Comment
  UCD84510  Quercus durata Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6061 Colusa Colusa County. On Lake County border. Walker Ridge. Along Walker Ridge Road, between Cold Spring and Buck Flat. 971 Comment
  CDA21886  Quercus durata var. durata L. P. Janeway 2000-5-31 6774 Colusa Inner North Coast Ranges.; On top of Hornet Nest Ridge, between Hornet Nest Spring and Hornet Nest Hill; about 6.4 km southwest of Stonyford. Comment
  CHSC79514  Quercus durata var. durata L. P. Janeway 2000-5-31 6774 Colusa Inner North Coast Ranges. On top of Hornet Nest Ridge, between Hornet Nest Spring and Hornet Nest Hill; about 6.4 km southwest of Stonyford. 884 Comment
  HSC71306  Quercus durata var. durata Thomas W. Nelson, Jane P. Nelson 1979-4-12 4620 Colusa Along Stony Creek below Digger Pine Campground 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
  UCD67036  Quercus garryana var. breweri Ellen Dean; Davis Botanical Society 2008-5-31 5017 Colusa west of I-5 at Maxwell, Goat Mountain, ridge below summit off of Goat Mountain Road. 1734 Comment
  CAS-BOT-BC61589  Quercus lobata Roxana Stinchfield 1916-7-9 428 Colusa grove near Sycamore. Phillips Ranch Comment
  SFV17752  Quercus palmeri J. M. Tucker 1991-8-19 4496 B Colusa Across Sulphur Creek from, and southeast of, the hotel at Wilbur Springs along a north-facing canyon slope. 427 Comment
  UCD14530  Quercus palmeri John M. Tucker 1991-8-19 4496 -B Colusa California, Colusa Co.; across Sulphur Creek from, and southeast of, the hotel at Wilbur Springs; Comment
  UCR255069  Quercus palmeri Roger Raiche 1990-12-2 s.n. Colusa North Coast Range, across Sulphur Creek from Wilbur Springs 412 Comment
  JEPS73455  Quercus vacciniifolia L. R. Heckard 1972-7-8 3056 Colusa se of Snow Mt.; West Peak 1981 Comment
  UCD84513  Quercus wislizeni var. frutescens Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6064 Colusa Colusa County. On Lake County border. Walker Ridge. Along Walker Ridge Road, between Cold Spring and Buck Flat. 971 Comment
  CHSC112222  Rafinesquia californica Lowell Ahart 2013-5-1 18670 Colusa On the east side of Bear Valley Road, about 2 1/2 miles (by road) northwest of the intersection of State Highway 20 and Bear Valley Road. 533 Comment
  HSC48162  Rafinesquia californica Thomas W. Nelson, Jane P. Nelson 1978-4-29 3926 Colusa Along Bear Valley Rd. ca. 2 mi. from its junction with S.R. 20 366 Comment
  JEPS81342  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
  CDA19005  Ranunculus aquatilis var. aquatilis R. Breckenridge 2000-9-25 PDR 958947 Colusa East Park Reservoir, including coves on northern end of reservoir in the vicinity of Stonyford. 0 Comment
  CAS-BOT-BC378937  Ranunculus californicus var. californicus Roxana Ferris 1926-4-21 6296 Colusa abandoned rice field 2 mi west of Colusa 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
  UCR206394  Ranunculus canus George K. Helmkamp, E. A. Helmkamp 2009-3-11 14373 Colusa Inner North Coast Range Foothills, along CA-20, 14.3 miles southwest of Williams 375 Comment
  UCR206701  Ranunculus canus George K. Helmkamp, E. A. Helmkamp 2009-3-17 14391 Colusa Inner North Coast Ranges Foothills, along CA-16 and Bear Creek, 4.3 miles south of the junction with CA-20 261 Comment
  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
  JEPS87655  Ranunculus hebecarpus Vernon H. Oswald and Lowell Ahart 1994-4-6 6057 Colusa Goat Mtn. Rd. 0.1 mi ne Digger Pine Flat (s of Stonyford) 463 Comment
  JEPS87656  Ranunculus hebecarpus Vernon H. Oswald and Lowell Ahart 1994-4-6 6057 Colusa Goat Mtn. Rd. 0.1 mi ne Digger Pine Flat (s of Stonyford) 463 Comment
  SEINET12091613  Ranunculus hebecarpus S. E. Booth 1981-1 1 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, ca 11 mi wsw of Williams. Wilbur Springs Quadrangle 15 143 Comment
  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
  HSC47743  Ranunculus muricatus Thomas W. Nelson, Jane P. Nelson 1978-4-29 3948 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  UCD82511  Ranunculus occidentalis Craig Thomsen; G. Harrington 2009-5-12 2869 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 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
  UC1191437  Ranunculus orthorhynchus var. bloomeri G. Thomas Robbins and S. Galen Smith 1950-4-15 1907 Colusa Bear Valley Comment
  UC1952501  Raphanus Richard Halse 2007-3-22 7105 Colusa Williams, by the junction of 5th Street and B Street 25 Comment
  CHSC99463  Raphanus raphanistrum Richard R. Halse 2007-3-22 7104 Colusa Williams; by the junction of 5th Street and B Street, 25 Comment
  SEINET255530  Raphanus raphanistrum Richard R. Halse 2007-3-22 7105 Colusa Williams; by the junction of 5th Street and B Street. 25 Comment
  UCR201547  Raphanus sativus George K. Helmkamp, E. A. Helmkamp 2008-10-14 14265 Colusa Sacramento Valley, along River Road (generally following the Sacramento River), 8.4 miles north of Colusa 17 Comment
  UCR257577  Raphanus sativus George K. Helmkamp, Elizabeth Helmkamp 2014-1-4 22509 Colusa Sacramento Valley, along CA-20 at Sycamore Cutoff, 1.3 miles west of the Sacramento River crossing 20 Comment
  SEINET13946282 Image available Rhamnus californica A. A. Heller 1916-1 12360 Colusa Coast Range on the grade about 3 mi W of Leesville Comment
  JEPS2828 Image available Rhamnus californica var. crassifolia W. L. Jepson 1920-5-23 8974 Colusa ridge w Bear Valley; ; W of Bear Valley, Colusa Co. Comment
  UC71642  Rhamnus ilicifolia Miss Alice King 1905-1 Colusa College City Comment
  CHSC75745  Rhamnus tomentella subsp. crassifolia Vernon H. Oswald; Lowell Ahart 1999-6-22 9785 Colusa 1.5 mi west of Stonyford-Lodoga Road on County Road 42 paralleling Little Stony Creek. Common shrub on a roadcut and on the rocky bank of Little Stony Creek. 426 Comment
  UC870844  Rhamnus tomentella subsp. crassifolia A. A. Heller 1916-6-6 12359 Colusa about 3 mi w Leesville (on the grade); Coast Range Comment
  CDA40545  Rhamnus tomentella subsp. crassifolia P. S. Crane 1979-8-14 s.n. Colusa 4 miles west of Ladoga Road on Goat Mountain. 0 Comment
  CDA21471  Rhododendron occidentale G. F. Hrusa 1989-5-7 6083 Colusa North Coast Ranges; N side of Little Stony Creek, approx. 3.7 miles upstream from intersection of Cedar Mtn. Rd. and Stonyford-Lodoga Rd. Comment
  UCD111678  Rhododendron occidentale Christopher Mallek 2008-1 s.n. Colusa Frenzel Creek. 654 Comment
  UCD117976  Rhododendron occidentale A. T. Leiser 1985-5-19 LO Colusa Between 3-4 miles along Frenzel Creek as it parallels the road M5 from Lodoga to Goat Mtn. Frenzel Creek is on S. side of road and down 30-40 ft. Populations are scattered in full sun on both sides of the creek. Comment
  HSC63082  Rhus aromatica David Wheeler 1979-4-14 63 Colusa Buck Flat, Walker Ridge, on the way to Barrel Springs. 884 Comment
  HSC71304  Rhus aromatica Thomas W. Nelson, Jane Nelson 1979-4-12 4622 Colusa Along Stony Creek below Digger Pine Campground Comment
  POM174573  Rhus trilobata var. quinata Roxana S. Ferris 1926-4-23 6590 Colusa 2 miles from Stony Ford. Comment
  CAS-BOT-BC168901  Ribes malvaceum Eric Peterson; Matt Foruria; Tom Ward 1995-4-2 59 Colusa 4.3 north on Walker Ridge Road from jct with Hwy 20 822 Comment
  UCD120073  Ribes quercetorum Gordon Harrington 2012-2-14 s.n. Colusa N side of Hwy 20 and Salt Creek Canyon between Hwy 16 and the Central Valley. Bear Valley Ranch property. Top of small canyon. 306 Comment
  UCR243003  Ribes quercetorum Gordon Harrington 2012-2-14 s.n. Colusa N side of Hwy 20 and Salt Creek Canyon between Hwy 16 and the Central Valley. Bear Valley Ranch property 306 Comment
  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
  UC1613352  Rigiopappus leptocladus Charles M. Belshaw 1937-4-1 2878 Colusa vicinity Cook's Spring (Devil's Ridge); Inner N. Coast Range, Devil's Ridge Comment
  UCD166310  Rigiopappus leptocladus Jack Major 1962-4-28 806 Colusa At entrance to Bear Valley. (Exact location unknown. Coordinates estimated by label maker.) 381 Comment
  UCD66448  Rigiopappus leptocladus Craig D. Thomsen 2000-5-11 2293 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  CHSC94411  Rorippa nasturtium-aquaticum Lowell Ahart 2006-8-9 13156 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  CHSC84231  Rosa californica Lowell Ahart 2003-7-14 10389 Colusa On the west side of Bear Valley Road, about 1/4 mile north of the intersection of Bear Valley Road and Wilber Springs Road and bridge. 379 Comment
  JEPS80273  Rumex acetosella L. R. Heckard, and J. Hickman 1980-9-16 5456 A Colusa ne slope West Peak (cirque area between peaks Snow Mt.); Snow Mt. 2011 Comment
  CAS-BOT-BC421589  Rumex crispus Roxana S. Ferris 1926-4-22 6284 Colusa 3 miles west of Colusa 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
  UCR146703  Sagittaria June McCaskill, Et al. 1954-8-9 363 Colusa c. 1 mi east of Princeton and 500 yds. south of Glenn County line 23 Comment
  SBBG115378  Sagittaria latifolia J. McCaskill, Mr. Harvey, L. Davis 1954-8-9 365 Colusa Butte Crk, ca. 4 mi E of Colusa, on E side of Sacramento River Comment
  UC1178889  Sagittaria latifolia Herbert L. Mason 1945-9-19 12714 Colusa 1 mi n Colusa (on e side, below causeway, marshy bank of the Sacramento River); marshy bank of the Sacramento River Comment
  UCD138041  Sagittaria latifolia Herbert L. Mason 1945-9-19 12713 Colusa Sacramento river, 1 mile north of Colusa on east side, below causeway. Comment
  UCD18529  Sagittaria latifolia June McCaskill; with Mr. Harvey and Loren Davis 1954-8-9 365 Colusa ca. 4 mi. east of Colusa, on east side of Sacramento River, Butte Creek Farms. Comment
  UCD138036  Sagittaria montevidensis subsp. calycina Herbert L. Mason; Verne Grant 1946-8-7 12981 Colusa 8 miles north of Colusa. Comment
  CAS-BOT-BC102859  Salix breweri C. Hart Merriam 1907-7-23 s.n. Colusa Cook Springs Comment
  CHSC62849  Salix breweri Vernon H. Oswald; Lowell Ahart 1994-3-23 6016 Colusa Frenzel Creek Research Natural Area on the S side of Little Stony Creek, in the section of the E side of Frenzel Creek, S of Stonyford. 518 Comment
  HSC71301  Salix breweri Thomas W. Nelson, Jane Nelson 1979-4-12 4525 Colusa Along Stony Creek below Digger Pine Campground Comment
  UCD55470  Salix breweri Ellen Dean; Gordon Harrington 2006-10-6 3294 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
  UCD56940  Salix breweri Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3542 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Thompson Canyon. 344 Comment
  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
  UCR198139  Salix breweri Ellen Dean, C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-7-7 3678 Colusa BLM Payne Ranch, lands to the southwest of junction of Hwy 20 and Hwy 16. Thomposon Canyon, near juncture with Craig Canyon 363 Comment
  UCD163351  Salix exigua Craig D. Thomsen 2000-5-12 2359 Colusa Walker Ridge. Along road to Elgin Mine. Comment
  UCD56932  Salix exigua Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3534 a Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Thompson Canyon. 344 Comment
  CAS-BOT-BC107841  Salix gooddingii Alice Eastwood 1921-4-11 10237 Colusa Bear Valley 7.3 miles north of junction with California State Highway 20 along Bear Valley Road Comment
  CDA39532  Salix gooddingii G. D. Barbe 1975-6-4 2008 Colusa North of boat ramp, Colusa State Recreation Area. 0 Comment
  CHSC77954  Salix laevigata Beth Hendrickson; B. Castro, L. P. Janeway, Mary Ann Griggs 1999-4-12 Colusa Vicinity of Antelope Valley, Funks Creek, and Golden Gate. 97 Comment
  UCD57306  Salix laevigata Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3677 Colusa BLM Payne Ranch. Lands to the southwest of junction of Hwy. 20 and Hwy. 16. Thompson Canyon, near juncture with Craig Canyon. 362 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
  CDA16095  Salix lasiolepis G. F. Hrusa 1999-5-16 15048 Colusa North Coast Ranges; Goat Mountain on S side. 1722 Comment
  UC1179060  Salix lasiolepis Herbert L. Mason 1947-3-29 13161 Colusa ca. 3 mi ne Colusa; Butte Sink, Butte Creek Comment
  UCD84433  Salix lasiolepis Jack Alderson 2009-4-8 33 Colusa BLM Bear Creek Ranch (Previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. Brophy Canyon. 304 Comment
  CHSC94432  Salix lasiolepis var. lasiolepis Lowell Ahart 2006-8-9 13147 Colusa Gravel bar, north side and 30 yards west of the bridge across Stony Creek, just north of Stonyford. 347 Comment
  CDA20233  Salsola australis P. Akers 2003-10-7 s.n. Colusa Sacramento Valley; 5th St and Hillgate Rd, Arbuckle, just E of Hwy 5 behind Shell Stn on RR tracks. 42 Comment
  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
  HSC45671  Salvia columbariae Stephen Plant 1978-4-22 206 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  HSC85862  Salvia columbariae R. Earing, C. Cavanaugh, C. Collins 1987-4-12 86 Colusa Leesville Grade Comment
  JEPS80781  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-BC238628  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
  UCD83684  Sambucus nigra subsp. caerulea John Rosenthal; with PLB 102 class 2010-5-2 5 Colusa East slope of Walker Ridge. Eaton Springs area. Growing one foot off of road leading into Eaton Springs Meadow. North side of the road. 716 Comment
  SEINET5585731  Sanicula bipinnata Richard R. Halse 2013-1 8741 Colusa Along the Leesville Road ca. 8.3 miles northwest of its junction with State Hwy. 20, west of Williams; or 4.8 miles southeast of the junction with Bear Valley Road. 314 Comment
  UC106104  Sanicula bipinnatifida T. Brandegee March 1889 Colusa Leesville Comment
  POM174565  Sanicula bipinnatifida Roxana S. Ferris 1926-4-23 6421 Colusa On grade, Williams- Stonyford Road Comment
  SEINET13945139 Image available Sanicula bipinnatifida Jack Major, Eilif Dahl 1962-1 sn Colusa Bear Valley Comment
  JEPS81286  Sanicula crassicaulis L. R. Heckard and J. C. Hickman 1982-7-5 5897 Colusa s side of Snow Mountain, Summit Springs Summit Springs; Snow Mountain, Summit Springs 1500 Comment
  UCD66530  Sanicula crassicaulis Craig D. Thomsen 2000-4-12 2153 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  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
  JEPS951  Sanicula tuberosa W. L. Jepson 1932-5-8 16274 Colusa Lodoga, w Colusa County Lodoga Comment
  UCD163232  Sanicula tuberosa Craig D. Thomsen 2001-4-12 2437 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 1 mile west of Hwy 20/16 intersection (about 1/8 mile east of vista point). 345 Comment
  UCD56685  Sanicula tuberosa Gordon Harrington 2007-3-25 10 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. 584 Comment
  SEINET13945258 Image available Sanicula tuberosa J. L. Hobson 1974-1 58 Colusa 0.75 mi. from the junction to Indian Valley on Walker Ridge Rd. Elev. 2800', Wilbur Springs Quad. T14N R6W SEC12 853 Comment
  UCR206666  Scandix pecten-veneris George K. Helmkamp, E. A. Helmkamp 2009-3-17 14390 Colusa Inner North Coast Ranges Foothills, along CA-16 and Bear Creek, 4.3 miles south of the junction with CA-20 261 Comment
  UCD81232  Schedonorus arundinaceus Ellen Dean; K. Mawdsley, B. Rice 2009-5-6 5569 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. 220 Comment
  CHSC75646  Schoenoplectus pungens Vernon H. Oswald 1999-6-22 9772 Colusa Fouts Springs Rd. (M10) 6.7 mi west of Stonyford-Elk Creek Rd. 597 Comment
  UCD63106  Schoenoplectus pungens var. longispicatus Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4937 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. 344 Comment
  UC1100902  Scirpus maritimus Malcolm A. Nobs, S. Galen Smith 1949-9-9 1872 Colusa rice fields 3 mi w Williams; w of Williams Comment
  UCD50163  Scirpus pungens D. Sanchez-Mata 1998-7-10 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain Road between Lodoga and Red Rock Cabin. 420 Comment
  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
  UCD83760  Scribneria bolanderi Ellen Dean; G. Harrington, K. Mawdsley, J. Shepard 2010-5-1 5956 Colusa Colusa County. Walker Ridge. Along Walker Ridge Road, Buck Flat. 875 Comment
  RSA589943  Scrophularia californica Michael A. Vincent, Robert M. Rhode 1996-3-30 7278 Colusa Along Bear Valley Rd. above Bear Creek, 1.4 mi. S jct. Wilbur Springs Rd. Comment
  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
  UC1562602  Scutellaria californica Barbara Ertter 1989-7-1 8617 Colusa 12 air mi wsw of Stonyford (road to Goat Mountain Lookout, 0.4 mi s of Rt M-10 (Bear Creek-Fouts Spring Rd) at head of South Fork Stony Creek); South Fork Stony Creek 1371 Comment
  UCD81728  Scutellaria siphocampyloides Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5730 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones Spring area on W side of road, ca. 6.5 road mi N of junction with Hwy 20. W side of road. 864 Comment
  HSC35372  Scutellaria tuberosa Robert M. Specht 1975-5-4 170 Colusa 1/2 mi. NE of Fouts Springs along Stoney Creek 488 Comment
  JEPS73510  Sedum obtusatum subsp. boreale L. R. Heckard 1972-7-10 3128 A Colusa among rocks of promontory on se corner of Snow Mt. overlooking and 3 mi nw Fouts Springs; se corner Snow Mt., nw of Fouts Springs 1828 Comment
Read comments
Aug 17 2011
  RSA700358  Senecio clevelandii L. P. Janeway 2001-6-6 7112 Colusa Eaton Springs, about 2.4 km. east of Walker Ridge Road. 713 Comment
  CDA11923  Senecio greenei G. F. Hrusa 1989-5-7 6078 Colusa North Coast Biodiversity Arena; N side of Little Stony Creek, approx. 3.7 miles upstream from intersection of Cedar Mtn. Rd. and Stonyford-Lodoga Rd. Comment
  UCR206873  Senecio vulgaris George K. Helmkamp, E. A. Helmkamp 2009-1-31 14316 Colusa Sacramento Valley, along River Road, 0.9 mile north of the city of Colusa 17 Comment
  HSC101845  Setaria parviflora J. P. Smith, J. O. Sawyer 2007-9-2 12411 Colusa River Rd. N of Colusa 20 Comment
  UCD121993  Sherardia arvensis V. C. Bryant 1925-10-10 s.n. Colusa Arbuckle. Comment
  CHSC112276  Sidalcea diploscypha Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18647 Colusa Inner North Coast Range. North side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  CHSC79528  Sidalcea diploscypha B. Castro; L. P. Janeway 2000-5-1 1104 A Colusa Vicinity of Sites and Grapevine Creek. 365 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
  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
  UCD82533  Sidalcea diploscypha Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5685 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 843 Comment
  OBI30253  Sidalcea diploscypha Chris M. Johnson 1970-5-8 A 19 a Colusa At the jctn of hwys 16 and 20 335 Comment
  RSA756334  Sidalcea keckii David Gowen 2008-5-24 921 Colusa Stoneyford Ladoga Road, about 1.6 miles south of Stoneyford. Comment
  JEPS123189  Sidalcea keckii David Gowen 2009-5-6 1014 Colusa Eastside of Hwy 20, about 16 miles west of Williams, near milepost 6.42 (from county line?). Comment
  CHSC91809  Sidalcea oregana subsp. hydrophila G. F. Hrusa; S. Winterton 2004-6-6 16385 Colusa Northern California. Inner North Coast Ranges. Mendocino National Forest. Rd 21N06D off 21N06 off Forest Rd. M3. Lower Markham Ridge at small pond site. Pond visible on 7.5' topo. 1348 Comment
  JEPS75730  Sidalcea oregana subsp. hydrophila L. R. Heckard 1974-9-9 3868 Colusa just ne of rocky promontory se Foutch Camp; Snow Mt., se of Foutch Camp 1798 Comment
  UC767046  Silene antirrhina R. F. Hoover 1938-4-24 3215 Colusa Sand Creek foothills w Arbuckle; Sand Creek foothills w of Arbuckle Comment
  CDA15466  Silene californica G. F. Hrusa, WTD 1998-6-19 14603 Colusa North Coast Ranges; Upper Little Stony Creek. Goat Mtn. Rd. ~ 2 km. W of campground. Comment
  POM174579  Silene californica Roxana S. Ferris 1926-4-23 6444 Colusa Near top of Grapevine Grade on Stonyford-Sites Road. Comment
  UCD56688  Silene campanulata subsp. glandulosa Gordon Harrington 2007-3-25 7 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. 586 Comment
  HSC62780  Silene campanulata subsp. glandulosa Thomas Wood 1979-4-14 108 Colusa 1067 Comment
  CAS-BOT-BC388980  Silene laciniata subsp. californica Lewis S. Rose 1936-4-27 36179 Colusa 11 mi. NW. of Rumsey 304 Comment
  CAS-BOT-BC388982  Silene laciniata subsp. californica Lewis S. Rose 1936-4-27 36179 Colusa 11 mi. NW. of Rumsey 304 Comment
  SEINET8879658  Silene laciniata subsp. californica R. R. Halse 2014-3-25 9036 Colusa Along the Bear Valley Road, ca 1.8 miles WNW of its junction with State Hwy 20. 378 Comment
  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
  UCD98993  Silene laciniata subsp. californica Cherry Kline 1964-5-2 51 Colusa Bear Creek Canyon, 3 miles north of the Wilbur Springs turnoff on State Highway 20. Comment
  JEPS73457  Silene verecunda subsp. platyota L. R. Heckard 1972-7-8 3061 Colusa saddle between East and West Peaks of Snow Mt. saddle between East and West Peak of Snow Mt. 1981 Comment
  SD22372  Silybum marianum Richard Neil 1938-6-20 Colusa Grimes Comment
  JEPS83163  Sinapis alba L. R. Heckard with J. Hickman 1980-7-3 5332 a Colusa SW Snow Montain, just W of Summit Springs 1548 Comment
  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
  CHSC110364  Sinapis arvensis Richard R. Halse 2010-3-20 7826 Colusa Along State Hwy 20 ca. 5.4 miles wwest of Colusa (junction of State Hwys 20 and 45). 17 Comment
  UCD63623  Sisymbrium altissimum Craig D. Thomsen 2008-3-21 2720 Colusa BLM Payne Ranch. 0.25 mile south of intersection of Hwy 16 and Hwy 20. Between Bear Creek and Hwy 16. Comment
  CHSC115383  Sisymbrium orientale Lowell Ahart 2015-4-1 19993 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
  CHSC112272  Sisyrinchium bellum Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18644 Colusa Inner North Coast Range. North side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  JEPS120994  Sisyrinchium bellum Lowell Ahart 2013-4-26 18644 Colusa Rocky serpentine outcrop on the north side of Hwy 20, just east of Lake County line, 12.2 air miles east northeast of the town of Clear Lake, 17.1 air miles west of Williams. Comment
  POM163504  Sisyrinchium bellum Roxana S. Ferris 1926-4-21 6307 Colusa Near Sycamore Comment
  RSA0115083  Sisyrinchium bellum Lowell A. Ahart, John Dittes, Josephine Guardino 2013-4-26 18644 Colusa On the north side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 567 Comment
  UCD64292  Sisyrinchium bellum Craig D. Thomsen 2000-4-12 2134 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  SBBG128715  Sisyrinchium bellum L. Ahart, J. Dittes, J. Guardino 2013-4-26 18644 Colusa N side of State Hwy 20, just E of Lake County Line, 12.2 mi ENE of Clear Lake (town), 17.1 mi W of Williams 566 Comment
  SEINET3887835  Smilacina racemosa var. amplexicaulis Barbara Bogert 1970-5-23 16 Colusa Bear Valley Road 2.5 miles north of State Highway 20.; 0 183 Comment
  CHSC57525  Solanum parishii Shelly A. Kirn 1991-4-6 12 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. 143 Comment
  CHSC77963  Solanum parishii Beth Hendrickson; Jean Witzman 1999-3-17 Colusa Vicnity of Antelope Valley, Grapevine Creek, and Sites-Lodoga Road. 152 Comment
  HSC42017  Solanum parishii M. A. Baker 1977-4-24 222 Colusa Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  HSC66005  Solanum parishii Teri Bartowski, Shane Feusier, Ruth Takaki, Carol Zimmerer 1980-4-19 40 Colusa 5.4 mi. from Lodoga along little Stony Creek at Digger Pine Campground Comment
  NY821051  Solanum parishii R. S. Ferris 1917-4-14 590 Colusa Arbuckle - Rumsey Road; along Sand Creek Comment
  CDA32822  Solanum parishii P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  NY723192  Solanum rostratum L. Ahart 1980-6-11 2370 Colusa 9¼ miles north of Colusa 35 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
  CHSC91068  Solidago velutina subsp. californica D. Isle 2002-8-12 180 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. 585 Comment
  HSC94133  Solidago velutina subsp. californica G. Fred Hrusa 1998-10-28 14900 Colusa Roadside along Cedar Camp Rd. as it enters Little Stony Creek Canyon, approx. 1 mi. from Lodoga/Stonyford Rd. 400 Comment
  UC1613356  Soliva sessilis Charles M. Belshaw Apr 1937 2873 Colusa vicinity Cook's Spring; Inner North Coast Range, Devil's Ridge Comment
  UCD72466  Sonchus asper Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3800 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. Bank of Bear Creek near north end of bridge, west side of creek. 260 Comment
  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-BC236520  Sorghum bicolor Mary L. Bowerman 1940-1-1 3836 Colusa Wall Point Trail, Mount Diablo Comment
  CAS-BOT-BC235304  Sorghum halepense Herbert L. Mason 1945-9-19 12723 Colusa Below causway over Butte Sink spillway, east bank of Sacramento River, 1 mile north of Colusa Comment
  SACT002290  Sorghum halepense Herbert Mason 1945-9-19 Colusa Below causeway over Butte Sink spillway, east bank of Sacramento River , 1 mile north of Colusa. Comment
  UC1100454  Sorghum halepense Herbert L. Mason 1945-9-10 12723 Colusa 1 mi. n. Colusa (below causeway over Butte Sink spillway, e. bank Sacramento R.); Sacramento R. Comment
  UCR205143  Sorghum halepense George K. Helmkamp, E. A. Helmkamp 2008-10-14 14248 Colusa Sacramento Valley, along CA-20, 0.2 mile east of the Sutter County line 9 Comment
  CAS-BOT-BC390101  Spergularia bocconi A. A. Heller 1916-6-9 12392 Colusa Along the state highway near Colusa Comment
  UCD99217  Spergularia macrotheca var. leucantha Malcolm A. Nobs; S. Galen Smith 1949-6-18 874 Colusa Highway 99 W, near Delevan. Comment
  CAS-BOT-BC390764  Spergularia marina G. B. Rossbach; R. P. Rossbach 1938-5-31 638 Colusa 5 mi. west of Colusa Comment
  CAS-BOT-BC390769  Spergularia marina G. B. Rossbach; R. P. Rossbach 1938-5-31 637 Colusa 2 mi. so. of Maxwell Comment
  POM253415  Spergularia salina var. tenuis G. B. Rossbach, Ruth P. Rossbach 1938-5-31 636 Colusa 2 miles S of Maxwell. Comment
  CHSC80392  Stachys ajugoides var. rigida Caroline Warren; Jenny Marr, Heidi West, Natalie Wight 1998-6-11 Colusa Vicinity of Funks Creek and Logan Ridge. 106 Comment
  CHSC71433  Stachys albens Vernon H. Oswald; Lowell Ahart 1998-7-15 9268 Colusa Bartlett Springs Rd. 1.6 mi west of Bear Valley Rd. 487 Comment
  JEPS104386  Stachys albens Lowell Ahart 2003-7-14 10381 -A Colusa Along a stream, field on the south side of Highway 20, ca 2 mi sw of the intersection of Highway 20 and Bear Valley Rd, ca 21 mi (by road) sw of Williams. 520 Comment
  JEPS94742  Stachys albens Vernon H. Oswald and Lowell Ahart 1998-7-15 9268 Colusa Bartlett Springs Road 1.6 mi w of Bear Valley Road; Bartlett Springs Road 487 Comment
  SEINET3450931  Stachys albens Unknown 2003-7-14 10381 A Colusa Williams, Williams, about 21 road miles southwest, south side of highway 20, about 2 miles southwest of the intersection of highway 20 and Bear Valley Road 520 Comment
  UCD125559  Stachys albens D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley Road. Bear Valley Creek. 370 Comment
  UCD61479  Stachys albens Ellen Dean; Gordon Harrington 2006-10-6 3288 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
  RSA724895  Stachys rigida subsp. quercetorum L. Ahart 2006-8-22 13235 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
  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
  UCR200673  Stachys stricta Craig D. Thomsen 2006-8-17 2712 Colusa BLM Payne Ranch, c. 30 feet east of Hwy 16, 0.5 mi. south of intersection between Hwy 16 and Hwy 20 300 Comment
  CAS-BOT-BC374775  Stebbinsoseris heterocarpa Roxana S. Ferris 1917-4-14 570 Colusa 7 mi west of Arbuckle, Arbuckle - Rumsey Road Comment
  CAS-BOT-BC386948  Stellaria media Roxana S. Ferris 1917-4-17 610 Colusa Sycamore Slough Comment
  CHSC62930  Stellaria nitens Vernon H. Oswald; Lowell Ahart 1994-4-6 6072 Colusa Goat Mtn. Rd. 0.8 mi S of Sullivan Creek Bridge, SW of Digger Pine Flat, S of Stonyford. On the edge of the road. 487 Comment
  UCD63015  Stellaria nitens Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4667 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. South of corral on west side of Bear Creek, just south of Hwy 20. 321 Comment
  UCD84552  Stephanomeria Ellen Dean; C. Thomsen, T. Hansen, and windfarm meeting 2010-6-11 6150 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones spring area on W side of road. Ca 6.5 road miles N of junction with Hwy 20. W side of road. 833 Comment
  CHSC94520  Stephanomeria paniculata Lowell Ahart 2006-8-22 13219 Colusa South side of Stony Ceek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford. 349 Comment
  UCD81218  Stephanomeria virgata Ellen Dean; K. Mawdsley, B. Rice, G. Harrington, and J. Alderson 2009-5-6 5555 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
  CDA15548  Stephanomeria virgata subsp. pleurocarpa G. F. Hrusa 1998-10-28 14899 Colusa North Coast Ranges; Cedar Camp Rd. as it enters Little Stony Ck. Cyn., approx. 1 mi. from Lodoga/Stonyford Rd. Comment
  CHSC79473  Stephanomeria virgata subsp. pleurocarpa G. F. Hrusa 1998-10-28 14899 Colusa Inner North Coast Ranges. Slope along Cedar Camp Rd. as it enters Little Stony Ck. Cyn., approx. 1 mi. from Lodoga/Stonyford Rd. 400 Comment
  UCD146707  Stephanomeria virgata subsp. pleurocarpa G. F. Hrusa 1998-10-28 14899 Colusa Inner North Coast Ranges. Along Cedar Camp Road as it enters Little Stony Creek Canyon, approximately 1 mile from Lodoga/Stonyford Road. 400 Comment
  UCD72375  Streptanthus batrachopus A. M. Shapiro 1988-6-6 s.n. Colusa Goat Mountain Road. 762 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
  UCD115959  Streptanthus breweri D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. 370 Comment
  UCD164311  Streptanthus breweri Ryan O'Dell 2010-7-1 s.n. Colusa UTM zone 10, 553253, 4318610. [UTM coordinates place this location along Bear Valley Rd., north of HWY 20.] 381 Comment
  CAS-BOT-BC61237  Streptanthus breweri Roger Raiche 1985-5-25 50460 Colusa Walker Ridge, Brim Road, near intersection West Walker Road. 637 Comment
  HSC62796  Streptanthus breweri M. A. Ericksen 1979-4-14 207 Colusa Adjacent to Bear Valley Rd., 3.9 mi. from Hwy. 20 Comment
  SEINET11998398  Streptanthus breweri Unknown 1986-1 60216 Colusa S of Snow Mt., nr intersection of road to Summit Springs & roads 17N29 & 24N02 1280 Comment
  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
  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
  UC1051693  Streptanthus breweri var. breweri Helen K. Sharsmith 1953-6-18 4256 Colusa Candy Bucket Spring Inner North Coast Ranges, Mendocino National Forest (road from Stoneyford to Mill Spring) 609 Comment
  UC1051749  Streptanthus breweri var. breweri Helen K. Sharsmith 1953-6-17 4251 Colusa above Wilbur Springs; Inner North Coast Ranges, Wide Awake Mercury Mine 462 Comment
  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
  UCD66907  Streptanthus breweri var. breweri Jack Alderson 2008-4-27 s.n. Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Slopes to the WNW of Cowboy Camp on the west side of Bear Creek. 427 Comment
  HSC72152  Streptanthus glandulosus J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9565 Colusa Bear Valley Rd., 2.1 mi. from its junction with Hwy. 20 366 Comment
  RSA430022B  Streptanthus glandulosus Sheila Logan 1978-4-22 71 Colusa Bear Valley Road, 1.5 miles from its jct with State Rte 20. 412 Comment
  HSC87332  Streptanthus glandulosus Gail B. Phillips 1982-3-27 4 Colusa Salt Canyon, N side of Salt Creek, Hwy. 20, 11 mi. WSW of Williams 143 Comment
  UC1552823  Streptanthus glandulosus subsp. glandulosus Frederica Bowcutt 1985-5-10 513 Colusa about 3 mi se Wilbur Springs (1 mi w of Hwy 20, b