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 251–300 of 1,412 (introduced).

• 
  Carpobrotus edulis (L.) L. Bolus Introduced CAED3

  hottentot fig · Aizoaceae 16 counties
• 
  Carthamus lanatus L. Introduced CALA20

  woolly distaff thistle · Asteraceae 23 counties
• 
  Carthamus lanatus L. ssp. creticus (L.) Holmboe Introduced CALAC3

  woolly distaff thistle · Asteraceae 18 counties
• 
  Carthamus lanatus L. ssp. lanatus Introduced CALAL10

  woolly distaff thistle · Asteraceae 4 counties
• 
  Carthamus leucocaulos Sm. Introduced CALE52

  whitestem distaff thistle · Asteraceae 1 county
• 
  Carthamus oxyacanthus M. Bieb. Introduced CAOX6

  jeweled distaff thistle · Asteraceae 1 county
• 
  Carthamus tinctorius L. Introduced CATI

  safflower · Asteraceae 9 counties
• 
  Catapodium rigidum (L.) C.E. Hubbard ex Dony Introduced CARI2

  ferngrass · Poaceae 10 counties
• 
  Catharanthus roseus (L.) G. Don Introduced CARO14

  Madagascar periwinkle · Apocynaceae 1 county
• 
  Caulerpa taxifolia (Vahl) C. Agardh Introduced CATA5

  killer alga · Caulerpaceae 2 counties
• 
  Cedronella canariensis (L.) Willd. ex Webb & Bethel. Introduced CECA

  herb of Gilead · Lamiaceae 1 county
• ⚘
  Celtis australis L. Introduced CEAU8

  European hackberry · Ulmaceae 2 counties
• 
  Celtis sinensis Pers. Introduced CESI8

  Chinese hackberry · Ulmaceae 4 counties
• 
  Centaurea babylonica (L.) L. Introduced CEBA4

  Syrian knapweed · Asteraceae 1 county
• 
  Centaurea calcitrapa L. Introduced CECA2

  red star-thistle · Asteraceae 45 counties
• 
  Centaurea calcitrapoides L. Introduced CECA5

  smallhead star-thistle · Asteraceae 1 county
• 
  Centaurea cineraria L. Introduced CECI2

  dusty miller · Asteraceae 1 county
• 
  Centaurea cyanus L. Introduced CECY2

  garden cornflower · Asteraceae 19 counties
• 
  Centaurea diffusa Lam. Introduced CEDI3

  diffuse knapweed · Asteraceae 29 counties
• 
  Centaurea diluta Aiton Introduced CEDI4

  North African knapweed · Asteraceae 4 counties
• 
  Centaurea eriophora L. Introduced CEER

  wild sandheath · Asteraceae 1 county
• 
  Centaurea iberica Trevir. ex Spreng. Introduced CEIB

  Iberian knapweed · Asteraceae 14 counties
• 
  Centaurea jacea L. Introduced CEJA

  brownray knapweed · Asteraceae 1 county
• 
  Centaurea melitensis L. Introduced CEME2

  Maltese star-thistle · Asteraceae 44 counties
• 
  Centaurea nigra L. Introduced CENI2

  lesser knapweed · Asteraceae 1 county
• 
  Centaurea nigrescens Willd. Introduced CENI3

  Tyrol knapweed · Asteraceae 14 counties
• 
  Centaurea solstitialis L. Introduced CESO3

  yellow star-thistle · Asteraceae 49 counties
• 
  Centaurea stoebe L. Introduced CEST8

  spotted knapweed · Asteraceae 36 counties
• 
  Centaurea stoebe L. ssp. micranthos (Gugler) Hayek Introduced CESTM

  spotted knapweed · Asteraceae 36 counties
• 
  Centaurea sulphurea Willd. Introduced CESU

  sulphur knapweed · Asteraceae 5 counties
• 
  Centaurea virgata Lam. Introduced CEVI

  squarrose knapweed · Asteraceae 10 counties
• 
  Centaurea virgata Lam. ssp. squarrosa (Willd.) Gugler Introduced CEVIS2

  squarrose knapweed · Asteraceae 10 counties
• ⚘
  Centaurea ×pouzinii DC. [aspera × calcitrapa] Introduced CEPO8

  knapweed · Asteraceae 1 county
• 
  Centaurium erythraea Rafn Introduced CEER5

  European centaury · Gentianaceae 3 counties
• 
  Centaurium tenuiflorum (Hoffmanns. & Link) Fritsch Introduced CETE9

  slender centaury · Gentianaceae 1 county
• 
  Centranthus ruber (L.) DC. Introduced CERU2

  red valerian · Valerianaceae 18 counties
• 
  Cerastium dichotomum L. Introduced CEDI5

  forked chickweed · Caryophyllaceae 1 county
• 
  Cerastium fontanum Baumg. Introduced CEFO2

  common mouse-ear chickweed · Caryophyllaceae 26 counties
• 
  Cerastium fontanum Baumg. ssp. vulgare (Hartm.) Greuter & Burdet Introduced CEFOV2

  big chickweed · Caryophyllaceae 26 counties
• 
  Cerastium glomeratum Thuill. Introduced CEGL2

  sticky chickweed · Caryophyllaceae 48 counties
• 
  Ceratocephala testiculata (Crantz) Roth Introduced CETE5

  curveseed butterwort · Ranunculaceae 8 counties
• 
  Ceratonia siliqua L. Introduced CESI3

  St. John's bread · Fabaceae 3 counties
• 
  Cestrum fasciculatum (Schltdl.) Miers Introduced CEFA3

  early jessamine · Solanaceae 1 county
• 
  Cestrum nocturnum L. Introduced CENO

  night jessamine · Solanaceae 2 counties
• 
  Cestrum parqui L'Hér. Introduced CEPA9

  Chilean jessamine · Solanaceae 3 counties
• 
  Chamaecytisus prolifera (L. f.) Link Introduced CHPR14

  escabon · Fabaceae 2 counties
• 
  Chamaemelum fuscatum (Brot.) Vasc. Introduced CHFU2

  Asteraceae 3 counties
• 
  Chamaemelum nobile (L.) All. Introduced CHNO3

  Roman chamomile · Asteraceae 3 counties
• 
  Chasmanthe floribunda (Salisb.) N.E. Br. Introduced CHFL9

  African cornflag · Iridaceae 5 counties
• 
  Chenopodium album L. var. album Introduced CHALA

  lambsquarters · Chenopodiaceae 2 counties