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 1,151–1,200 of 1,412 (introduced).

• 
  Santolina chamaecyparissus L. Introduced SACH2

  lavender cotton · Asteraceae 6 counties
• 
  Saponaria officinalis L. Introduced SAOF4

  bouncingbet · Caryophyllaceae 20 counties
• 
  Saxifraga stolonifera Meerb. Introduced SAST6

  creeping saxifrage · Saxifragaceae 1 county
• 
  Scabiosa atropurpurea L. Introduced SCAT

  mourningbride · Dipsacaceae 15 counties
• 
  Scabiosa stellata L. Introduced SCST

  starflower pincushions · Dipsacaceae 1 county
• 
  Scandix pecten-veneris L. Introduced SCPE

  shepherdsneedle · Apiaceae 23 counties
• 
  Schedonorus arundinaceus (Schreb.) Dumort., nom. cons. Introduced SCAR7

  tall fescue · Poaceae 32 counties
• 
  Schedonorus pratensis (Huds.) P. Beauv. Introduced SCPR4

  meadow fescue · Poaceae 28 counties
• 
  Schinus molle L. Introduced SCMO

  Peruvian peppertree · Anacardiaceae 12 counties
• 
  Schinus polygamus (Cav.) Cabrera Introduced SCPO7

  Hardee peppertree · Anacardiaceae 3 counties
• 
  Schinus terebinthifolius Raddi Introduced SCTE

  Brazilian peppertree · Anacardiaceae 3 counties
• 
  Schinus terebinthifolius Raddi var. raddianus Engl. Introduced SCTER2

  Brazilian peppertree · Anacardiaceae 3 counties
• 
  Schismus arabicus Nees Introduced SCAR

  Arabian schismus · Poaceae 14 counties
• 
  Schismus barbatus (Loefl. ex L.) Thell. Introduced SCBA

  common Mediterranean grass · Poaceae 14 counties
• 
  Schoenoplectiella mucronata (L.) J. Jung & H.K. Choi Introduced SCMU15

  bog bulrush · Cyperaceae 8 counties
• 
  Scleranthus annuus L. Introduced SCAN2

  German knotgrass · Caryophyllaceae 19 counties
• 
  Sclerochloa dura (L.) P. Beauv. Introduced SCDU2

  common hardgrass · Poaceae 1 county
• 
  Scolymus hispanicus L. Introduced SCHI

  common goldenthistle · Asteraceae 4 counties
• 
  Scorzonera hispanica L. Introduced SCHI2

  black salsify · Asteraceae 4 counties
• 
  Scrophularia peregrina L. Introduced SCPE11

  Mediterranean figwort · Scrophulariaceae 1 county
• ⚘
  Scutellaria caerulea Moc. & Sessé Introduced SCCA31

  blue skullcap · Lamiaceae 1 county
• 
  Secale cereale L. Introduced SECE

  cereal rye · Poaceae 24 counties
• 
  Securigera varia (L.) Lassen Introduced SEVA4

  crownvetch · Fabaceae 1 county
• 
  Sedum album L. Introduced SEAL

  white stonecrop · Crassulaceae 3 counties
• 
  Sedum dendroideum Moc. & Sessé ex A. DC. Introduced SEDE8

  tree stonecrop · Crassulaceae 1 county
• 
  Selaginella kraussiana (Kunze) A. Braun Introduced SEKR

  Krauss' spikemoss · Selaginellaceae 2 counties
• 
  Senecio cineraria DC. Introduced SECI2

  dusty miller · Asteraceae 2 counties
• 
  Senecio elegans L. Introduced SEEL

  redpurple ragwort · Asteraceae 5 counties
• 
  Senecio jacobaea L. Introduced SEJA

  stinking willie · Asteraceae 10 counties
• 
  Senecio linearifolius A. Rich. Introduced SELI

  Fireweed groundsel · Asteraceae 2 counties
• 
  Senecio linearifolius A. Rich. var. linearifolius Introduced SELIL

  Fireweed groundsel · Asteraceae 2 counties
• 
  Senecio squalidus L. Introduced SESQ

  oxford ragwort · Asteraceae 1 county
• 
  Senecio sylvaticus L. Introduced SESY

  woodland ragwort · Asteraceae 16 counties
• 
  Senecio vulgaris L. Introduced SEVU

  old-man-in-the-Spring · Asteraceae 40 counties
• 
  Senna artemisioides (Gaudich. ex DC.) Randell Introduced SEAR13

  silver senna · Fabaceae 4 counties
• 
  Senna artemisioides (Gaudich. ex DC.) Randell ssp. ×coriacea (Benth.) Randell [? × cardiosperma ssp. gawlerensis] Introduced SEARC

  scented senna · Fabaceae 1 county
• 
  Senna didymobotrya (Fresen.) Irwin & Barneby Introduced SEDI8

  African senna · Fabaceae 2 counties
• 
  Senna multiglandulosa (Jacq.) Irwin & Barneby Introduced SEMU14

  glandular senna · Fabaceae 5 counties
• 
  Sesamum orientale L. Introduced SEOR4

  sesame · Pedaliaceae 2 counties
• 
  Sesbania punicea (Cav.) Benth. Introduced SEPU7

  rattlebox · Fabaceae 4 counties
• 
  Setaria faberi Herrm. Introduced SEFA

  Japanese bristlegrass · Poaceae 5 counties
• 
  Setaria italica (L.) P. Beauv. Introduced SEIT

  foxtail millet · Poaceae 2 counties
• 
  Setaria sphacelata (Schumach.) Stapf & C.E. Hubb. ex M.B. Moss Introduced SESP5

  African bristlegrass · Poaceae 6 counties
• 
  Setaria verticillata (L.) P. Beauv. Introduced SEVE3

  hooked bristlegrass · Poaceae 13 counties
• 
  Setaria viridis (L.) P. Beauv. Introduced SEVI4

  green bristlegrass · Poaceae 35 counties
• 
  Setaria viridis (L.) P. Beauv. var. viridis Introduced SEVIV

  green bristlegrass · Poaceae 34 counties
• 
  Sherardia arvensis L. Introduced SHAR2

  blue fieldmadder · Rubiaceae 27 counties
• 
  Silene armeria L. Introduced SIAR

  sweet William silene · Caryophyllaceae 1 county
• 
  Silene conoidea L. Introduced SICO4

  weed silene · Caryophyllaceae 1 county
• 
  Silene dichotoma Ehrh. Introduced SIDI2

  forked catchfly · Caryophyllaceae 4 counties