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 1,251–1,300 of 1,412 (introduced).

• 
  Spartina anglica C.E. Hubbard Introduced SPAN5

  common cordgrass · Poaceae 1 county
• 
  Spartina densiflora Brongn. Introduced SPDE2

  denseflower cordgrass · Poaceae 3 counties
• 
  Spartium junceum L. Introduced SPJU2

  Spanish broom · Fabaceae 20 counties
• 
  Spergula arvensis L. Introduced SPAR

  corn spurry · Caryophyllaceae 25 counties
• 
  Spergularia bocconii (Scheele) Foucaud ex Merino Introduced SPBO

  Boccone's sandspurry · Caryophyllaceae 21 counties
• 
  Spergularia diandra (Guss.) Held. & Sart. Introduced SPDI

  alkali sandspurry · Caryophyllaceae 1 county
• 
  Spergularia maritima (All.) Chiov. Introduced SPMA10

  media sandspurry · Caryophyllaceae 4 counties
• 
  Spergularia platensis (Camb.) Fenzl Introduced SPPL2

  La Plata sandspurry · Caryophyllaceae 1 county
• 
  Spergularia rubra (L.) J. Presl & C. Presl Introduced SPRU

  red sandspurry · Caryophyllaceae 31 counties
• 
  Spergularia villosa (Pers.) Camb. Introduced SPVI

  hairy sandspurry · Caryophyllaceae 15 counties
• 
  Sphaerophysa salsula (Pall.) DC. Introduced SPSA3

  alkali swainsonpea · Fabaceae 2 counties
• 
  Spinacia oleracea L. Introduced SPOL

  spinach · Chenopodiaceae 2 counties
• 
  Sporobolus creber De Nardi Introduced SPCR6

  slender dropseed · Poaceae 1 county
• 
  Sporobolus indicus (L.) R. Br. Introduced SPIN4

  smut grass · Poaceae 7 counties
• 
  Sporobolus indicus (L.) R. Br. var. indicus Introduced SPINI2

  smut grass · Poaceae 7 counties
• 
  Stachys arvensis (L.) L. Introduced STAR

  staggerweed · Lamiaceae 4 counties
• 
  Stellaria graminea L. Introduced STGR

  grass-like starwort · Caryophyllaceae 2 counties
• 
  Stellaria media (L.) Vill. Introduced STME2

  common chickweed · Caryophyllaceae 50 counties
• 
  Stellaria media (L.) Vill. ssp. media Introduced STMEM

  common chickweed · Caryophyllaceae 2 counties
• 
  Stellaria media (L.) Vill. ssp. pallida (Dumort.) Asch. & Graebn. Introduced STMEP

  common chickweed · Caryophyllaceae 10 counties
• 
  Symphytum asperum Lepechin Introduced SYAS

  prickly comfrey · Boraginaceae 3 counties
• 
  Symphytum officinale L. Introduced SYOF

  common comfrey · Boraginaceae 2 counties
• 
  Syzygium nervosum DC. Introduced SYNE2

  Daly River satinash · Myrtaceae 1 county
• 
  Taeniatherum caput-medusae (L.) Nevski Introduced TACA8

  medusahead · Poaceae 30 counties
• 
  Tagetes erecta L. Introduced TAER

  Aztec marigold · Asteraceae 4 counties
• 
  Tagetes minuta L. Introduced TAMI3

  muster John Henry · Asteraceae 5 counties
• 
  Tagetes patula L. Introduced TAPA

  French marigold · Asteraceae 1 county
• 
  Tamarix aphylla (L.) Karst. Introduced TAAP

  Athel tamarisk · Tamaricaceae 6 counties
• 
  Tamarix chinensis Lour. Introduced TACH2

  five-stamen tamarisk · Tamaricaceae 6 counties
• 
  Tamarix gallica L. Introduced TAGA

  French tamarisk · Tamaricaceae 5 counties
• 
  Tamarix parviflora DC. Introduced TAPA4

  smallflower tamarisk · Tamaricaceae 19 counties
• 
  Tamarix ramosissima Ledeb. Introduced TARA

  saltcedar · Tamaricaceae 14 counties
• 
  Tanacetum balsamita L. Introduced TABA

  costmary · Asteraceae 1 county
• 
  Tanacetum parthenium (L.) Sch. Bip. Introduced TAPA6

  feverfew · Asteraceae 24 counties
• 
  Tanacetum vulgare L. Introduced TAVU

  common tansy · Asteraceae 15 counties
• 
  Taraxacum laevigatum (Willd.) DC. Introduced TALA2

  rock dandelion · Asteraceae 2 counties
• 
  Taraxacum officinale F.H. Wigg. ssp. officinale Introduced TAOFO

  common dandelion · Asteraceae 5 counties
• 
  Teesdalia coronopifolia (Bergeret) Thell. Introduced TECO7

  lesser shepherdscress · Brassicaceae 1 county
• 
  Tetragonia tetragonioides (Pall.) Kuntze Introduced TETE3

  New Zealand spinach · Aizoaceae 14 counties
• 
  Teucrium fruticans L. Introduced TEFR3

  shrubby germander · Lamiaceae 1 county
• 
  Themeda quadrivalvis (L.) Kuntze Introduced THQU

  kangaroo grass · Poaceae 1 county
• 
  Themeda quadrivalvis (L.) Kuntze var. quadrivalvis Introduced THQUQ

  kangaroo grass · Poaceae 1 county
• 
  Thinopyrum intermedium (Host) Barkworth & D.R. Dewey Introduced THIN6

  intermediate wheatgrass · Poaceae 18 counties
• 
  Thinopyrum ponticum (Podp.) Z.-W. Liu & R.-C. Wang Introduced THPO7

  tall wheatgrass · Poaceae 18 counties
• 
  Thlaspi arvense L. Introduced THAR5

  field pennycress · Brassicaceae 13 counties
• 
  Tolpis barbata (L.) Gaertn. Introduced TOBA

  European umbrella milkwort · Asteraceae 4 counties
• 
  Torilis arvensis (Huds.) Link Introduced TOAR

  spreading hedgeparsley · Apiaceae 23 counties
• 
  Torilis arvensis (Huds.) Link ssp. arvensis Introduced TOARA

  spreading hedgeparsley · Apiaceae 21 counties
• 
  Torilis arvensis (Huds.) Link ssp. heterophylla (Guss.) A. Thell Introduced TOARH

  spreading hedgeparsley · Apiaceae 9 counties
• 
  Torilis japonica (Houtt.) DC. Introduced TOJA

  erect hedgeparsley · Apiaceae 3 counties