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 2,051–2,100 of 9,954.

• 
  Ceanothus oliganthus Nutt. Native CEOL

  hairy ceanothus · Rhamnaceae 25 counties
• 
  Ceanothus ophiochilus Boyd, Ross & Arnseth Native CEOP

  Vail Lake ceanothus · Rhamnaceae 1 county
• 
  Ceanothus palmeri Trel. Native CEPA

  Palmer ceanothus · Rhamnaceae 13 counties
• 
  Ceanothus papillosus Torr. & A. Gray Native CEPA2

  wartleaf ceanothus · Rhamnaceae 10 counties
• 
  Ceanothus papillosus Torr. & A. Gray var. papillosus Native CEPAP3

  wartleaf ceanothus · Rhamnaceae 6 counties
• 
  Ceanothus papillosus Torr. & A. Gray var. roweanus McMinn Native CEPAR

  wartleaf ceanothus · Rhamnaceae 7 counties
• 
  Ceanothus parryi Trel. Native CEPA3

  Parry ceanothus · Rhamnaceae 7 counties
• 
  Ceanothus parvifolius (S. Watson) Trel. Native CEPA4

  littleleaf ceanothus · Rhamnaceae 10 counties
• 
  Ceanothus pinetorum Coville Native CEPI

  Coville ceanothus · Rhamnaceae 3 counties
• 
  Ceanothus prostratus Benth. Native CEPR

  prostrate ceanothus · Rhamnaceae 21 counties
• 
  Ceanothus pumilus Greene Native CEPU

  dwarf ceanothus · Rhamnaceae 9 counties
• 
  Ceanothus purpureus Jeps. Native CEPU2

  hollyleaf ceanothus · Rhamnaceae 3 counties
• 
  Ceanothus roderickii Knight Native CERO4

  Pine Hill buckbrush · Rhamnaceae 1 county
• 
  Ceanothus sanguineus Pursh Native CESA

  redstem ceanothus · Rhamnaceae 2 counties
• 
  Ceanothus sonomensis J.T. Howell Native CESO

  Sonoma ceanothus · Rhamnaceae 2 counties
• ⚘
  Ceanothus sorediatus Hook. & Arn. Native CESO2

  jimbrush · Rhamnaceae 24 counties
• 
  Ceanothus spinosus Nutt. Native CESP

  redheart · Rhamnaceae 8 counties
• 
  Ceanothus thyrsiflorus Eschsch. Native CETH

  blueblossom · Rhamnaceae 15 counties
• 
  Ceanothus tomentosus Parry Native CETO

  woolyleaf ceanothus · Rhamnaceae 12 counties
• 
  Ceanothus velutinus Douglas ex Hook. Native CEVE

  snowbrush ceanothus · Rhamnaceae 26 counties
• 
  Ceanothus velutinus Douglas ex Hook. var. hookeri M.C. Johnst. Native CEVEH2

  Hooker's ceanothus · Rhamnaceae 10 counties
• 
  Ceanothus velutinus Douglas ex Hook. var. velutinus Native CEVEV4

  snowbrush ceanothus · Rhamnaceae 19 counties
• 
  Ceanothus verrucosus Nutt. Native CEVE2

  barranca brush · Rhamnaceae 1 county
• 
  Ceanothus ×arcuatus McMinn (pro sp.) [cuneatus × fresnensis] Native CEAR2

  ceanothus · Rhamnaceae 2 counties
• ⚘
  Ceanothus ×flexilis Greene ex McMinn [cuneatus × prostratus] Native CEFL4

  flexible ceanothus · Rhamnaceae 6 counties
• ⚘
  Ceanothus ×lobbianus Hook. (pro sp.) [dentatus × griseus] Native CELO

  ceanothus · Rhamnaceae 1 county
• ⚘
  Ceanothus ×lorenzenii (Jeps.) McMinn [cordulatus × velutinus] Native CELO2

  ceanothus · Rhamnaceae 9 counties
• ⚘
  Ceanothus ×mendocinensis McMinn [thyrsiflorus × velutinus] Native CEME3

  Mendocino ceanothus · Rhamnaceae 2 counties
• 
  Ceanothus ×otayensis McMinn [crassifolus × greggii] Native CEOT

  ceanothus · Rhamnaceae 1 county
• ⚘
  Ceanothus ×rugosus Greene (pro sp.) [prostratus × velutinus] Native CERU

  ceanothus · Rhamnaceae 2 counties
• ⚘
  Ceanothus ×serrulatus McMinn (pro sp.) [cordulatus × prostratus] Native CESE

  Cascade Lake ceanothus · Rhamnaceae 1 county
• ⚘
  Ceanothus ×veitchianus Hook. (pro sp.) [cuneatus × griseus] Native CEVE4

  ceanothus · Rhamnaceae 1 county
• 
  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 laevigata Willd. Native CELA

  sugarberry · Ulmaceae 5 counties
• 
  Celtis laevigata Willd. var. reticulata (Torr.) L.D. Benson Native CELAR

  netleaf hackberry · Ulmaceae 5 counties
• 
  Celtis sinensis Pers. Introduced CESI8

  Chinese hackberry · Ulmaceae 4 counties
• 
  Cenchrus echinatus L. Native CEEC

  southern sandbur · Poaceae 2 counties
• 
  Cenchrus longispinus (Hack.) Fernald Native CELO3

  mat sandbur · Poaceae 12 counties
• 
  Cenchrus spinifex Cav. Native CESP4

  coastal sandbur · Poaceae 7 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