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 101–150 of 1,412 (introduced).

• 
  Anthemis tinctoria L. Introduced ANTI

  golden chamomile · Asteraceae 3 counties
• 
  Anthoxanthum aristatum Boiss. Introduced ANAR7

  annual vernalgrass · Poaceae 6 counties
• 
  Anthoxanthum odoratum L. Introduced ANOD

  sweet vernalgrass · Poaceae 18 counties
• 
  Anthoxanthum odoratum L. ssp. odoratum Introduced ANODO2

  sweet vernalgrass · Poaceae 18 counties
• 
  Anthriscus caucalis M. Bieb. Introduced ANCA14

  bur chervil · Apiaceae 31 counties
• 
  Antirrhinum majus L. Introduced ANMA3

  garden snapdragon · Scrophulariaceae 6 counties
• 
  Apera interrupta (L.) P. Beauv. Introduced APIN

  dense silkybent · Poaceae 5 counties
• 
  Apera spica-venti (L.) P. Beauv. Introduced APSP

  loose silkybent · Poaceae 3 counties
• 
  Aphanes arvensis L. Introduced APAR2

  field parsley piert · Rosaceae 38 counties
• 
  Apium graveolens L. Introduced APGR2

  wild celery · Apiaceae 23 counties
• 
  Apium graveolens L. var. dulce (Mill.) DC. Introduced APGRD

  wild celery · Apiaceae 23 counties
• 
  Aponogeton distachyos L. f. Introduced APDI

  Cape pondweed · Aponogetonaceae 2 counties
• 
  Aptenia cordifolia (L. f.) Schwant. Introduced APCO

  heartleaf iceplant · Aizoaceae 4 counties
• 
  Arabidopsis thaliana (L.) Heynh. Introduced ARTH

  mouseear cress · Brassicaceae 15 counties
• 
  Araujia sericifera Brot. Introduced ARSE8

  white bladderflower · Asclepiadaceae 23 counties
• 
  Arctium lappa L. Introduced ARLA3

  greater burdock · Asteraceae 9 counties
• 
  Arctium minus Bernh. Introduced ARMI2

  lesser burdock · Asteraceae 9 counties
• 
  Arctotheca calendula (L.) Levyns Introduced ARCA45

  Capeweed · Asteraceae 7 counties
• 
  Arctotis stoechadifolia P.J. Bergius Introduced ARST2

  African daisy · Asteraceae 3 counties
• 
  Arenaria serpyllifolia L. Introduced ARSE2

  thymeleaf sandwort · Caryophyllaceae 14 counties
• 
  Argyranthemum foeniculum (Willd.) Sch. Bip. Introduced ARFO7

  dill daisy · Asteraceae 2 counties
• 
  Argyranthemum frutescens (L.) Sch. Bip. Introduced ARFR11

  marguerite · Asteraceae 1 county
• 
  Aristotelia chilensis (Molina) Stuntz Introduced ARCH17

  maquei · Elaeocarpaceae 1 county
• 
  Armoracia rusticana G. Gaertn., B. Mey. & Scherb. Introduced ARRU4

  horseradish · Brassicaceae 1 county
• 
  Arrhenatherum elatius (L.) P. Beauv. ex J. Presl & C. Presl Introduced AREL3

  tall oatgrass · Poaceae 18 counties
• 
  Artemisia annua L. Introduced ARAN3

  sweet sagewort · Asteraceae 22 counties
• 
  Artemisia biennis Willd. var. biennis Introduced ARBIB

  biennial wormwood · Asteraceae 20 counties
• 
  Arum italicum Mill. Introduced ARIT

  Italian lords and ladies · Araceae 5 counties
• 
  Arum palestinum Boiss. Introduced ARPA39

  Solomon's lily · Araceae 1 county
• 
  Arundo donax L. Introduced ARDO4

  giant reed · Poaceae 25 counties
• 
  Asclepias curassavica L. Introduced ASCU

  bloodflower · Asclepiadaceae 4 counties
• 
  Asclepias fruticosa L. Introduced ASFR13

  African milkweed · Asclepiadaceae 1 county
• 
  Asparagus asparagoides (L.) Druce Introduced ASAS4

  African asparagus fern · Liliaceae 6 counties
• 
  Asparagus officinalis L. Introduced ASOF

  garden asparagus · Liliaceae 21 counties
• 
  Asparagus setaceus (Kunth) Jessop Introduced ASSE12

  common asparagus fern · Liliaceae 1 county
• 
  Asperugo procumbens L. Introduced ASPR

  German-madwort · Boraginaceae 2 counties
• 
  Asphodelus fistulosus L. Introduced ASFI2

  onionweed · Liliaceae 6 counties
• 
  Astragalus cicer L. Introduced ASCI4

  chickpea milkvetch · Fabaceae 1 county
• 
  Atriplex amnicola Paul G. Wilson Introduced ATAM3

  swamp saltbush · Chenopodiaceae 3 counties
• 
  Atriplex glauca L. Introduced ATGL2

  waxy saltbush · Chenopodiaceae 4 counties
• 
  Atriplex hortensis L. Introduced ATHO

  garden orache · Chenopodiaceae 4 counties
• 
  Atriplex lindleyi Moq. Introduced ATLI

  Lindley's saltbush · Chenopodiaceae 1 county
• 
  Atriplex micrantha Ledeb. Introduced ATMI2

  twoscale saltbush · Chenopodiaceae 7 counties
• 
  Atriplex muelleri Benth. Introduced ATMU

  Mueller's saltbush · Chenopodiaceae 2 counties
• 
  Atriplex nummularia Lindl. Introduced ATNU

  bluegreen saltbush · Chenopodiaceae 1 county
• 
  Atriplex patula L. Introduced ATPA4

  spear saltbush · Chenopodiaceae 13 counties
• 
  Atriplex rosea L. Introduced ATRO

  tumbling saltweed · Chenopodiaceae 32 counties
• 
  Atriplex semibaccata R. Br. Introduced ATSE

  Australian saltbush · Chenopodiaceae 24 counties
• 
  Atriplex stipitata Benth. Introduced ATST2

  mallee saltbush · Chenopodiaceae 1 county
• 
  Atriplex suberecta I. Verd. Introduced ATSU80

  peregrine saltbush · Chenopodiaceae 7 counties