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 651–700 of 1,412 (introduced).

• 
  Hordeum marinum Huds. ssp. marinum Introduced HOMAM

  seaside barley · Poaceae 1 county
• 
  Hordeum murinum L. Introduced HOMU

  mouse barley · Poaceae 51 counties
• 
  Hordeum murinum L. ssp. glaucum (Steud.) Tzvelev Introduced HOMUG

  smooth barley · Poaceae 35 counties
• 
  Hordeum murinum L. ssp. leporinum (Link) Arcang. Introduced HOMUL

  hare barley · Poaceae 47 counties
• 
  Hordeum murinum L. ssp. murinum Introduced HOMUM

  wall barley · Poaceae 3 counties
• 
  Hordeum vulgare L. Introduced HOVU

  common barley · Poaceae 22 counties
• 
  Hunnemannia fumariifolia Sweet Introduced HUFU

  Mexican tulip poppy · Papaveraceae 1 county
• 
  Hyacinthus orientalis L. Introduced HYOR

  garden hyacinth · Liliaceae 1 county
• 
  Hydrilla verticillata (L. f.) Royle Introduced HYVE3

  waterthyme · Hydrocharitaceae 18 counties
• 
  Hydrocotyle moschata G. Forst. Introduced HYMO4

  musky marshpennywort · Apiaceae 2 counties
• 
  Hydrocotyle sibthorpioides Lam. Introduced HYSI

  lawn marshpennywort · Apiaceae 1 county
• 
  Hyparrhenia hirta (L.) Stapf Introduced HYHI

  thatching grass · Poaceae 1 county
• 
  Hypericum androsaemum L. Introduced HYAN8

  sweet-amber · Clusiaceae 1 county
• 
  Hypericum calycinum L. Introduced HYCA10

  Aaron's beard · Clusiaceae 4 counties
• 
  Hypericum canariense L. Introduced HYCA11

  Canary Island St. Johnswort · Clusiaceae 2 counties
• 
  Hypericum hookerianum Wight & Arn. Introduced HYHO2

  Hooker's St. Johnswort · Clusiaceae 2 counties
• 
  Hypericum perforatum L. Introduced HYPE

  common St. Johnswort · Clusiaceae 36 counties
• 
  Hypochaeris glabra L. Introduced HYGL2

  smooth cat's ear · Asteraceae 42 counties
• 
  Hypochaeris radicata L. Introduced HYRA3

  hairy cat's ear · Asteraceae 27 counties
• 
  Iberis umbellata L. Introduced IBUM

  globe candytuft · Brassicaceae 1 county
• 
  Ibicella lutea (Lindl.) Van Eselt. Introduced IBLU

  yellow unicorn-plant · Pedaliaceae 10 counties
• 
  Ilex aquifolium L. Introduced ILAQ80

  English holly · Aquifoliaceae 7 counties
• 
  Impatiens balfourii Hook. f. Introduced IMBA2

  Balfour's touch-me-not · Balsaminaceae 2 counties
• 
  Inula helenium L. Introduced INHE

  elecampane inula · Asteraceae 15 counties
• 
  Ionopsidium acaule (Desf.) Rchb. Introduced IOAC2

  false diamondflower · Brassicaceae 1 county
• 
  Ipomoea aquatica Forssk. Introduced IPAQ

  swamp morning-glory · Convolvulaceae 2 counties
• 
  Ipomoea cairica (L.) Sweet Introduced IPCA

  mile a minute vine · Convolvulaceae 1 county
• 
  Ipomoea indica (Burm. f.) Merr. Introduced IPIN

  oceanblue morning-glory · Convolvulaceae 2 counties
• 
  Ipomoea purpurea (L.) Roth Introduced IPPU2

  tall morning-glory · Convolvulaceae 9 counties
• 
  Ipomoea quamoclit L. Introduced IPQU

  cypressvine · Convolvulaceae 1 county
• 
  Ipomoea triloba L. Introduced IPTR2

  littlebell · Convolvulaceae 2 counties
• 
  Iris foetidissima L. Introduced IRFO

  stinking iris · Iridaceae 3 counties
• ⚘
  Iris germanica L. Introduced IRGE

  German iris · Iridaceae 5 counties
• 
  Iris orientalis Mill. Introduced IROR

  yellowband iris · Iridaceae 1 county
• 
  Iris pseudacorus L. Introduced IRPS

  paleyellow iris · Iridaceae 14 counties
• 
  Isatis tinctoria L. Introduced ISTI

  Dyer's woad · Brassicaceae 25 counties
• 
  Isolepis prolifera (Rottb.) R.Br. Introduced ISPR2

  proliferating bulrush · Cyperaceae 1 county
• 
  Isolepis setacea (L.) R. Br. Introduced ISSE2

  bristleleaf bulrush · Cyperaceae 7 counties
• 
  Ixia campanulata Houtt. Introduced IXCA

  belllflower African cornlily · Iridaceae 1 county
• 
  Ixia maculata L. Introduced IXMA

  spotted African cornlily · Iridaceae 1 county
• 
  Ixia polystachya L. Introduced IXPO

  white-and-yellow-flower cornlily · Iridaceae 1 county
• 
  Jarava plumosa (Spreng.) S.L.W. Jacobs & J. Everett Introduced JAPL

  South American rice grass · Poaceae 1 county
• 
  Juglans regia L. Introduced JURE80

  English walnut · Juglandaceae 8 counties
• 
  Juncus capitatus Weigel Introduced JUCA5

  leafybract dwarf rush · Juncaceae 15 counties
• 
  Juncus cyperoides Laharpe Introduced JUCY

  Forbestown rush · Juncaceae 2 counties
• 
  Juncus planifolius R. Br. Introduced JUPL

  broadleaf rush · Juncaceae 1 county
• 
  Kickxia elatine (L.) Dumort. Introduced KIEL

  sharpleaf cancerwort · Scrophulariaceae 25 counties
• 
  Kickxia spuria (L.) Dumort. Introduced KISP

  roundleaf cancerwort · Scrophulariaceae 19 counties
• 
  Kniphofia uvaria (L.) Oken Introduced KNUV80

  redhot poker · Liliaceae 9 counties
• 
  Lactuca saligna L. Introduced LASA

  willowleaf lettuce · Asteraceae 28 counties