California

• Alameda 06001
  1,856 taxa Open ↗
• Alpine 06003
  1,174 taxa Open ↗
• Amador 06005
  1,226 taxa Open ↗
• Butte 06007
  2,704 taxa Open ↗
• Calaveras 06009
  1,227 taxa Open ↗
• Colusa 06011
  1,330 taxa Open ↗
• Contra Costa 06013
  1,712 taxa Open ↗
• Del Norte 06015
  1,424 taxa Open ↗
• El Dorado 06017
  1,950 taxa Open ↗
• Fresno 06019
  2,373 taxa Open ↗

Showing 2,401–2,450 of 9,954.

• 
  Cirsium mohavense (Greene) Petr. Native CIMO

  Mojave thistle · Asteraceae 5 counties
• 
  Cirsium neomexicanum A. Gray Native CINE

  New Mexico thistle · Asteraceae 4 counties
• 
  Cirsium occidentale (Nutt.) Jeps. Native CIOC

  cobwebby thistle · Asteraceae 51 counties
• 
  Cirsium occidentale (Nutt.) Jeps. var. californicum (A. Gray) Keil & C. Turner Native CIOCC4

  cobwebby thistle · Asteraceae 25 counties
• 
  Cirsium occidentale (Nutt.) Jeps. var. candidissimum (Greene) J.F. Macbr. Native CIOCC

  snowy thistle · Asteraceae 16 counties
• 
  Cirsium occidentale (Nutt.) Jeps. var. compactum Hoover Native CIOCC2

  compact cobwebby thistle · Asteraceae 3 counties
• 
  Cirsium occidentale (Nutt.) Jeps. var. occidentale Native CIOCO

  cobwebby thistle · Asteraceae 18 counties
• 
  Cirsium occidentale (Nutt.) Jeps. var. venustum (Greene) Jeps. Native CIOCV

  cobwebby thistle · Asteraceae 33 counties
• 
  Cirsium ochrocentrum A. Gray Native CIOC2

  yellowspine thistle · Asteraceae 14 counties
• 
  Cirsium ochrocentrum A. Gray ssp. ochrocentrum Native CIOCO2

  yellowspine thistle · Asteraceae 14 counties
• ⚘
  Cirsium praeteriens J.F. Macbr. Native CIPR2

  Palo Alto thistle · Asteraceae 1 county
• 
  Cirsium quercetorum (A. Gray) Jeps. Native CIQU2

  Alameda County thistle · Asteraceae 14 counties
• 
  Cirsium remotifolium (Hook.) DC. Native CIRE

  fewleaf thistle · Asteraceae 11 counties
• 
  Cirsium rhothophilum S.F. Blake Native CIRH

  surf thistle · Asteraceae 2 counties
• 
  Cirsium scabrum (Poir.) Bonnet & Barratte Introduced CISC4

  rough thistle · Asteraceae 1 county
• 
  Cirsium scariosum Nutt. Native CISC2

  meadow thistle · Asteraceae 25 counties
• 
  Cirsium subniveum Rydb. Native CISU

  Jackson Hole thistle · Asteraceae 2 counties
• 
  Cirsium undulatum (Nutt.) Spreng. Native CIUN

  wavyleaf thistle · Asteraceae 12 counties
• 
  Cirsium undulatum (Nutt.) Spreng. var. undulatum Native CIUNU

  wavyleaf thistle · Asteraceae 12 counties
• 
  Cirsium vulgare (Savi) Ten. Introduced CIVU

  bull thistle · Asteraceae 50 counties
• 
  Cissus antarctica Venten. Introduced CIAN3

  kangaroo vine · Vitaceae 2 counties
• 
  Cistanthe ambigua (S. Watson) Hershkovitz Native CIAM3

  desert pussypaws · Portulacaceae 5 counties
• 
  Cistanthe maritima (Nutt.) Hershkovitz Native CIMA4

  seaside pussypaws · Portulacaceae 5 counties
• 
  Cistanthe monandra (Nutt.) Hershkovitz Native CIMO4

  common pussypaws · Portulacaceae 18 counties
• 
  Cistanthe monosperma (Greene) Hershkovitz Native CIMO5

  oneseed pussypaws · Portulacaceae 33 counties
• 
  Cistanthe parryi (A. Gray) Hershkovitz Native CIPA7

  Parry's pussypaws · Portulacaceae 14 counties
• 
  Cistanthe parryi (A. Gray) Hershkovitz var. hesseae (J.H. Thomas) Kartesz & Gandhi Native CIPAH

  Hesse's pussypaws · Portulacaceae 4 counties
• 
  Cistanthe parryi (A. Gray) Hershkovitz var. nevadensis (J.T. Howell) Kartesz & Gandhi Native CIPAN

  Nevada pussypaws · Portulacaceae 1 county
• 
  Cistanthe parryi (A. Gray) Hershkovitz var. parryi Native CIPAP

  Parry's pussypaws · Portulacaceae 14 counties
• 
  Cistanthe pulchella (Eastw.) Hershkovitz Native CIPU5

  Mariposa pussypaws · Portulacaceae 3 counties
• 
  Cistanthe pygmaea (Parish ex Rydb.) Hershkovitz Native CIPY

  pygmy pussypaws · Portulacaceae 2 counties
• 
  Cistanthe quadripetala (S. Watson) Hershkovitz Native CIQU4

  fourpetal pussypaws · Portulacaceae 7 counties
• 
  Cistanthe rosea (S. Watson) Hershkovitz Native CIRO2

  rosy pussypaws · Portulacaceae 4 counties
• 
  Cistanthe umbellata (Torr.) Hershkovitz Native CIUM

  Mt. Hood pussypaws · Portulacaceae 30 counties
• 
  Cistanthe umbellata (Torr.) Hershkovitz var. caudicifera (A. Gray) Kartesz & Gandhi Native CIUMC

  Mt. Hood pussypaws · Portulacaceae 6 counties
• 
  Cistanthe umbellata (Torr.) Hershkovitz var. umbellata Native CIUMU

  Mt. Hood pussypaws · Portulacaceae 30 counties
• ⚘
  Cistus incanus L. Introduced CIIN80

  hairy rockrose · Cistaceae 4 counties
• ⚘
  Cistus incanus L. ssp. corsicus (Loisel.) Heywood Introduced CIINC

  hairy rockrose · Cistaceae 1 county
• ⚘
  Cistus incanus L. ssp. creticus (L.) Heywood Introduced CIINC2

  Cretan rockrose · Cistaceae 3 counties
• 
  Cistus ladanifer L. Introduced CILA10

  common gum cistus · Cistaceae 1 county
• 
  Cistus monspeliensis L. Introduced CIMO7

  Montpelier cistus · Cistaceae 2 counties
• 
  Cistus salviifolius L. Introduced CISA

  salvia cistus · Cistaceae 2 counties
• 
  Citrullus lanatus (Thunb.) Matsum. & Nakai Introduced CILA3

  watermelon · Cucurbitaceae 5 counties
• 
  Cladium californicum (S. Watson) O'Neill Native CLCA2

  California sawgrass · Cyperaceae 6 counties
• 
  Clarkia affinis F.H. Lewis & M.E. Lewis Native CLAF

  chaparral clarkia · Onagraceae 23 counties
• 
  Clarkia amoena (Lehm.) A. Nelson & J.F. Macbr. Native CLAM

  farewell to spring · Onagraceae 14 counties
• 
  Clarkia amoena (Lehm.) A. Nelson & J.F. Macbr. ssp. amoena Native CLAMA

  farewell to spring · Onagraceae 8 counties
• 
  Clarkia amoena (Lehm.) A. Nelson & J.F. Macbr. ssp. huntiana (Jeps.) F.H. Lewis & M.E. Lewis Native CLAMH

  farewell to spring · Onagraceae 10 counties
• 
  Clarkia amoena (Lehm.) A. Nelson & J.F. Macbr. ssp. whitneyi (A. Gray) F.H. Lewis & M.E. Lewis Native CLAMW

  Whitney's clarkia · Onagraceae 2 counties
• 
  Clarkia arcuata (Kellogg) A. Nelson & J.F. Macbr. Native CLAR

  glandular clarkia · Onagraceae 8 counties