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 301–350 of 1,412 (introduced).

• ⚘
  Chenopodium carnosulum Moq. Introduced CHCA12

  ridged goosefoot · Chenopodiaceae 3 counties
• ⚘
  Chenopodium carnosulum Moq. var. patagonicum (Phil.) Wahl Introduced CHCAP

  ridged goosefoot · Chenopodiaceae 3 counties
• 
  Chenopodium foliosum (Moench) Asch. Introduced CHFO2

  leafy goosefoot · Chenopodiaceae 6 counties
• ⚘
  Chenopodium humile Hook. Introduced CHHU

  marshland goosefoot · Chenopodiaceae 2 counties
• 
  Chenopodium macrospermum Hook. f. var. halophilum (Phil.) Standl. Introduced CHMAH

  saltloving goosefoot · Chenopodiaceae 14 counties
• 
  Chenopodium murale L. Introduced CHMU2

  nettleleaf goosefoot · Chenopodiaceae 35 counties
• 
  Chenopodium opulifolium Schrad. ex W.D.J. Koch & Ziz Introduced CHOP

  seaport goosefoot · Chenopodiaceae 1 county
• 
  Chenopodium polyspermum L. Introduced CHPO

  manyseed goosefoot · Chenopodiaceae 1 county
• 
  Chenopodium polyspermum L. var. acutifolium (Sm.) Gaudich. Introduced CHPOA

  manyseed goosefoot · Chenopodiaceae 1 county
• 
  Chenopodium vulvaria L. Introduced CHVU

  stinking goosefoot · Chenopodiaceae 8 counties
• 
  Chloris gayana Kunth Introduced CHGA2

  Rhodes grass · Poaceae 9 counties
• 
  Chloris truncata R. Br. Introduced CHTR

  Australian fingergrass · Poaceae 3 counties
• 
  Chlorophytum capense (L.) Voss Introduced CHCA28

  bracketplant · Liliaceae 1 county
• 
  Chondrilla juncea L. Introduced CHJU

  rush skeletonweed · Asteraceae 28 counties
• 
  Chorispora tenella (Pall.) DC. Introduced CHTE2

  crossflower · Brassicaceae 19 counties
• ⚘
  Chrysanthemum ×morifolium Ramat. (pro sp.) Introduced CHMO14

  florist's daisy · Asteraceae 1 county
• 
  Cichorium endivia L. Introduced CIEN

  cultivated endive · Asteraceae 1 county
• 
  Cichorium intybus L. Introduced CIIN

  chicory · Asteraceae 27 counties
• 
  Cinnamomum camphora (L.) J. Presl Introduced CICA

  camphortree · Lauraceae 1 county
• 
  Cirsium arvense (L.) Scop. Introduced CIAR4

  Canada thistle · Asteraceae 47 counties
• 
  Cirsium scabrum (Poir.) Bonnet & Barratte Introduced CISC4

  rough thistle · Asteraceae 1 county
• 
  Cirsium vulgare (Savi) Ten. Introduced CIVU

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

  kangaroo vine · Vitaceae 2 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
• 
  Clematis terniflora DC. Introduced CLTE4

  sweet autumn virginsbower · Ranunculaceae 1 county
• 
  Clematis vitalba L. Introduced CLVI6

  evergreen clematis · Ranunculaceae 1 county
• 
  Cnicus benedictus L. Introduced CNBE

  blessed thistle · Asteraceae 23 counties
• 
  Coincya monensis (L.) Greuter & Burdet Introduced COMO9

  star-mustard · Brassicaceae 1 county
• 
  Coincya monensis (L.) Greuter & Burdet ssp. recurvata (All.) Leadley Introduced COMOR

  star-mustard · Brassicaceae 1 county
• 
  Colutea arborescens L. Introduced COAR6

  bladder senna · Fabaceae 3 counties
• 
  Commelina benghalensis L. Introduced COBE2

  jio · Commelinaceae 7 counties
• 
  Commelina coelestis Willd. Introduced COCO28

  commelina · Commelinaceae 1 county
• 
  Conicosia pugioniformis (L.) N.E. Br. Introduced COPU18

  narrow-leaved iceplant · Aizoaceae 4 counties
• 
  Conium maculatum L. Introduced COMA2

  poison hemlock · Apiaceae 39 counties
• 
  Conringia orientalis (L.) Dumort. Introduced COOR

  hare's ear mustard · Brassicaceae 2 counties
• 
  Consolida ajacis (L.) Schur Introduced COAJ

  doubtful knight's-spur · Ranunculaceae 7 counties
• 
  Convolvulus althaeoides L. Introduced COAL4

  mallow bindweed · Convolvulaceae 2 counties
• 
  Convolvulus arvensis L. Introduced COAR4

  field bindweed · Convolvulaceae 44 counties
• 
  Convolvulus tricolor L. Introduced COTR17

  dwarf morning-glory · Convolvulaceae 1 county
• 
  Conyza bonariensis (L.) Cronquist Introduced COBO

  asthmaweed · Asteraceae 32 counties
• 
  Conyza floribunda Kunth Introduced COFL

  asthmaweed · Asteraceae 12 counties
• 
  Coprosma repens A. Rich. Introduced CORE4

  creeping mirrorplant · Rubiaceae 3 counties
• 
  Coriandrum sativum L. Introduced COSA

  coriander · Apiaceae 10 counties
• 
  Coronilla valentina L. Introduced COVA4

  Mediterranean crownvetch · Fabaceae 1 county