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 1,801–1,850 of 8,499 (native).

• 
  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
• 
  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
• 
  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
• 
  Centaurium arizonicum (A. Gray) A. Heller Native CEAR12

  Arizona centaury · Gentianaceae 1 county
• 
  Centaurium davyi (Jeps.) Abrams Native CEDA

  Davy's centaury · Gentianaceae 15 counties
• 
  Centaurium exaltatum (Griseb.) W. Wight ex Piper Native CEEX

  desert centaury · Gentianaceae 17 counties
• 
  Centaurium muehlenbergii (Griseb.) W. Wight ex Piper Native CEMU2

  Muhlenberg's centaury · Gentianaceae 35 counties
• 
  Centaurium namatophilum Reveal, C.R. Broome & Beatley Native CENA2

  springloving centaury · Gentianaceae 1 county
• 
  Centaurium trichanthum (Griseb.) B.L. Rob. Native CETR2

  alkali centaury · Gentianaceae 16 counties
• 
  Centaurium venustum (A. Gray) B.L. Rob. Native CEVE3

  charming centaury · Gentianaceae 32 counties
• 
  Centaurium venustum (A. Gray) B.L. Rob. ssp. abramsii Munz Native CEVEA

  charming centaury · Gentianaceae 25 counties
• 
  Centaurium venustum (A. Gray) B.L. Rob. ssp. venustum Native CEVEV

  charming centaury · Gentianaceae 6 counties
• 
  Centromadia parryi (Greene) Greene Native CEPA21

  pappose tarweed · Asteraceae 21 counties
• 
  Centromadia parryi (Greene) Greene ssp. australis (D.D. Keck) B.G. Baldw. Native CEPAA

  pappose tarweed · Asteraceae 5 counties
• 
  Centromadia parryi (Greene) Greene ssp. congdonii (B.L. Rob. & Greenm.) B.G. Baldw. Native CEPAC

  Congdon's tarweed · Asteraceae 8 counties
• 
  Centromadia parryi (Greene) Greene ssp. parryi Native CEPAP4

  pappose tarweed · Asteraceae 14 counties
• 
  Centromadia parryi (Greene) Greene ssp. rudis (Greene) B.G. Baldw. Native CEPAR4

  pappose tarweed · Asteraceae 7 counties
• 
  Centromadia pungens (Hook. & Arn.) Greene Native CEPU14

  common tarweed · Asteraceae 36 counties
• 
  Centromadia pungens (Hook. & Arn.) Greene ssp. laevis (D.D. Keck) B.G. Baldw. Native CEPUL

  common tarweed · Asteraceae 4 counties
• 
  Centromadia pungens (Hook. & Arn.) Greene ssp. maritima (Greene) B.G. Baldw. Native CEPUM

  common tarweed · Asteraceae 14 counties
• 
  Centromadia pungens (Hook. & Arn.) Greene ssp. pungens Native CEPUP6

  common tarweed · Asteraceae 36 counties
• 
  Centromadia pungens (Hook. & Arn.) Greene ssp. septentrionalis (D.D. Keck) B.G. Baldw. Native CEPUS2

  common tarweed · Asteraceae 4 counties
• 
  Centrostegia thurberi A. Gray ex Benth. Native CETH3

  red triangles · Polygonaceae 15 counties
• 
  Cephalanthera austiniae (A. Gray) A. Heller Native CEAU

  phantom orchid · Orchidaceae 28 counties
• 
  Cephalanthus occidentalis L. Native CEOC2

  common buttonbush · Rubiaceae 30 counties
• 
  Cerastium arvense L. ssp. strictum (L.) Ugborogho Native CEARS2

  field chickweed · Caryophyllaceae 1 county
• 
  Cerastium beeringianum Cham. & Schltdl. Native CEBE2

  Bering chickweed · Caryophyllaceae 3 counties
• 
  Cerastium beeringianum Cham. & Schltdl. ssp. earlei (Rydb.) Hultén Native CEBEE

  Bering chickweed · Caryophyllaceae 3 counties
• 
  Ceratophyllum demersum L. Native CEDE4

  coon's tail · Ceratophyllaceae 33 counties
• 
  Ceratopteris thalictroides (L.) Brongn. Native CETH2

  watersprite · Parkeriaceae 1 county
• 
  Cercis orbiculata Greene Native CEOR9

  California redbud · Fabaceae 34 counties
• 
  Cercocarpus intricatus S. Watson Native CEIN7

  littleleaf mountain mahogany · Rosaceae 6 counties
• 
  Cercocarpus ledifolius Nutt. Native CELE3

  curl-leaf mountain mahogany · Rosaceae 29 counties
• 
  Cercocarpus ledifolius Nutt. var. intercedens C.K. Schneid. Native CELEI

  curl-leaf mountain mahogany · Rosaceae 29 counties
• 
  Cercocarpus montanus Raf. Native CEMO2

  alderleaf mountain mahogany · Rosaceae 47 counties
• 
  Cercocarpus montanus Raf. var. blancheae (C.K. Schneid.) F.L. Martin Native CEMOB

  island mountain mahogany · Rosaceae 3 counties