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 1,051–1,100 of 1,412 (introduced).

• 
  Prunus persica (L.) Batsch var. persica Introduced PRPEP2

  peach · Rosaceae 4 counties
• 
  Prunus serrulata Lindl. Introduced PRSE3

  Japanese flowering cherry · Rosaceae 1 county
• 
  Pseudocydonia sinensis (Thouin) C.K. Schneid. Introduced PSSI4

  Chinese-quince · Rosaceae 1 county
• 
  Pseudognaphalium luteoalbum (L.) Hilliard & B.L. Burtt Introduced PSLU6

  Jersey cudweed · Asteraceae 42 counties
• 
  Pseudosasa japonica (Siebold & Zucc. ex Steud.) Makino ex Nakai Introduced PSJA

  arrow bamboo · Poaceae 1 county
• 
  Pteris cretica L. Introduced PTCR2

  Cretan brake · Pteridaceae 9 counties
• 
  Pteris cretica L. var. cretica Introduced PTCRC

  Cretan brake · Pteridaceae 9 counties
• 
  Pteris tremula R. Br. Introduced PTTR3

  Australian brake · Pteridaceae 1 county
• 
  Pteris vittata L. Introduced PTVI

  ladder brake · Pteridaceae 1 county
• 
  Puccinellia distans (Jacq.) Parl. ssp. distans Introduced PUDID

  weeping alkaligrass · Poaceae 9 counties
• 
  Pulicaria paludosa Link Introduced PUPA6

  Spanish false fleabane · Asteraceae 2 counties
• 
  Punica granatum L. Introduced PUGR2

  pomegranate · Punicaceae 3 counties
• 
  Pyracantha angustifolia (Franch.) C.K. Schneid. Introduced PYAN

  narrowleaf firethorn · Rosaceae 3 counties
• 
  Pyracantha coccinea M. Roem. Introduced PYCO2

  scarlet firethorn · Rosaceae 2 counties
• 
  Pyracantha crenulata (D. Don) Roem. Introduced PYCR7

  Nepalese firethorn · Rosaceae 3 counties
• 
  Pyracantha fortuneana (Maxim.) Li Introduced PYFO

  Chinese firethorn · Rosaceae 6 counties
• 
  Pyrus communis L. Introduced PYCO

  common pear · Rosaceae 9 counties
• 
  Quercus ilex L. Introduced QUIL2

  holly oak · Fagaceae 3 counties
• 
  Ranunculus acris L. var. acris Introduced RAACA3

  showy buttercup · Ranunculaceae 1 county
• 
  Ranunculus arvensis L. Introduced RAAR3

  corn buttercup · Ranunculaceae 13 counties
• 
  Ranunculus bulbosus L. Introduced RABU

  St. Anthony's turnip · Ranunculaceae 1 county
• 
  Ranunculus cortusifolius Willd. Introduced RACO21

  Azores buttercup · Ranunculaceae 1 county
• 
  Ranunculus muricatus L. Introduced RAMU2

  spinyfruit buttercup · Ranunculaceae 32 counties
• 
  Ranunculus parviflorus L. Introduced RAPA3

  smallflower buttercup · Ranunculaceae 5 counties
• 
  Ranunculus repens L. Introduced RARE3

  creeping buttercup · Ranunculaceae 19 counties
• 
  Ranunculus sardous Crantz Introduced RASA

  hairy buttercup · Ranunculaceae 6 counties
• 
  Raphanus raphanistrum L. Introduced RARA2

  wild radish · Brassicaceae 27 counties
• ⚘
  Raphanus sativus L. Introduced RASA2

  cultivated radish · Brassicaceae 39 counties
• 
  Rapistrum rugosum (L.) All. Introduced RARU

  annual bastardcabbage · Brassicaceae 3 counties
• 
  Reseda alba L. Introduced REAL

  white upright mignonette · Resedaceae 7 counties
• 
  Reseda lutea L. Introduced RELU

  yellow mignonette · Resedaceae 2 counties
• 
  Reseda luteola L. Introduced RELU2

  weld · Resedaceae 8 counties
• 
  Reseda odorata L. Introduced REOD

  garden mignonette · Resedaceae 2 counties
• 
  Retama monosperma (L.) Boiss. Introduced REMO2

  bridal broom · Fabaceae 1 county
• 
  Rhagadiolus stellatus (L.) Gaertn. Introduced RHST3

  endive daisy · Asteraceae 2 counties
• 
  Rhodanthe chlorocephala (Turcz.) P. Wilson Introduced RHCH13

  rosy sunray · Asteraceae 1 county
• 
  Rhodanthe chlorocephala (Turcz.) P. Wilson ssp. rosea (Hook.) P. Wilson Introduced RHCHR

  rosy sunray · Asteraceae 1 county
• 
  Rhus lancea L. f. Introduced RHLA11

  African sumac · Anacardiaceae 2 counties
• 
  Ricinus communis L. Introduced RICO3

  castorbean · Euphorbiaceae 11 counties
• 
  Romulea rosea (L.) Eckl. Introduced RORO

  rosy sandcrocus · Iridaceae 5 counties
• 
  Romulea rosea (L.) Eckl. var. australis (Ewart) de Vos Introduced ROROA

  rosy sandcrocus · Iridaceae 5 counties
• 
  Rorippa austriaca (Crantz) Besser Introduced ROAU

  Austrian yellowcress · Brassicaceae 1 county
• 
  Rorippa sylvestris (L.) Besser Introduced ROSY

  creeping yellowcress · Brassicaceae 3 counties
• 
  Rosa canina L. Introduced ROCA3

  dog rose · Rosaceae 5 counties
• 
  Rosa multiflora Thunb. Introduced ROMU

  multiflora rose · Rosaceae 5 counties
• 
  Rosa rubiginosa L. Introduced RORU82

  sweetbriar rose · Rosaceae 14 counties
• 
  Rosa sicula Tratt. Introduced ROSI5

  Mediterranean rose · Rosaceae 1 county
• 
  Rosmarinus officinalis L. Introduced ROOF

  rosemary · Lamiaceae 2 counties
• 
  Rostraria cristata (L.) Tzvelev Introduced ROCR3

  Mediterranean hairgrass · Poaceae 22 counties
• 
  Rotala indica (Willd.) Koehne Introduced ROIN3

  Indian toothcup · Lythraceae 1 county