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 5,951–6,000 of 8,499 (native).

• 
  Oenothera deltoides Torr. & Frém. ssp. deltoides Native OEDED4

  birdcage evening primrose · Onagraceae 7 counties
• 
  Oenothera deltoides Torr. & Frém. ssp. howellii (Munz) W. Klein Native OEDEH

  Antioch Dunes evening primrose · Onagraceae 1 county
• 
  Oenothera deltoides Torr. & Frém. ssp. piperi (Munz) W. Klein Native OEDEP

  Piper's evening primrose · Onagraceae 5 counties
• 
  Oenothera elata Kunth Native OEEL

  Hooker's evening primrose · Onagraceae 43 counties
• 
  Oenothera elata Kunth ssp. hirsutissima (A. Gray ex S. Watson) W. Dietr. Native OEELH

  Hooker's evening primrose · Onagraceae 34 counties
• 
  Oenothera elata Kunth ssp. hookeri (Torr. & A. Gray) W. Dietr. & W.L. Wagner Native OEELH2

  Hooker's evening primrose · Onagraceae 19 counties
• 
  Oenothera flava (A. Nelson) Garrett Native OEFL

  yellow evening primrose · Onagraceae 7 counties
• 
  Oenothera flava (A. Nelson) Garrett ssp. flava Native OEFLF

  yellow evening primrose · Onagraceae 7 counties
• 
  Oenothera laciniata Hill Native OELA

  cutleaf evening primrose · Onagraceae 3 counties
• 
  Oenothera longissima Rydb. Native OELO

  longstem evening primrose · Onagraceae 3 counties
• 
  Oenothera primiveris A. Gray Native OEPR

  desert evening primrose · Onagraceae 5 counties
• 
  Oenothera primiveris A. Gray ssp. bufonis (M.E. Jones) Munz Native OEPRB

  desert evening primrose · Onagraceae 4 counties
• 
  Oenothera primiveris A. Gray ssp. primiveris Native OEPRP

  desert evening primrose · Onagraceae 4 counties
• 
  Oenothera pubescens Willd. ex Spreng. Native OEPU

  South American evening primrose · Onagraceae 1 county
• 
  Oenothera rosea L'Hér. ex Aiton Native OERO

  rose evening primrose · Onagraceae 3 counties
• 
  Oenothera sinuosa W.L. Wagner & Hoch Native OESI3

  wavyleaf beeblossom · Onagraceae 15 counties
• 
  Oenothera speciosa Nutt. Native OESP2

  pinkladies · Onagraceae 6 counties
• 
  Oenothera suffrutescens (Ser.) W.L. Wagner & Hoch Native OESU3

  scarlet beeblossom · Onagraceae 15 counties
• 
  Oenothera villosa Thunb. Native OEVI

  hairy evening primrose · Onagraceae 5 counties
• 
  Oenothera villosa Thunb. ssp. strigosa (Rydb.) W. Dietr. & P.H. Raven Native OEVIS

  hairy evening primrose · Onagraceae 5 counties
• 
  Oenothera wolfii (Munz) P.H. Raven, W. Dietr. & Stubbe Native OEWO

  Wolf's evening primrose · Onagraceae 3 counties
• ⚘
  Oenothera xerogaura W.L. Wagner & Hoch Native OEXE

  Drummond's beeblossom · Onagraceae 13 counties
• 
  Oenothera xylocarpa Coville Native OEXY

  woodyfruit evening primrose · Onagraceae 2 counties
• 
  Oligomeris linifolia (Vahl) J.F. Macbr. Native OLLI

  lineleaf whitepuff · Resedaceae 11 counties
• 
  Olneya tesota A. Gray Native OLTE

  desert ironwood · Fabaceae 4 counties
• 
  Olsynium douglasii (A. Dietr.) E.P. Bicknell Native OLDO

  Douglas' grasswidow · Iridaceae 4 counties
• 
  Olsynium douglasii (A. Dietr.) E.P. Bicknell var. douglasii Native OLDOD

  Douglas' grasswidow · Iridaceae 4 counties
• 
  Ophioglossum californicum Prantl Native OPCA8

  California adderstongue · Ophioglossaceae 10 counties
• 
  Ophioglossum pusillum Raf. Native OPPU3

  northern adderstongue · Ophioglossaceae 3 counties
• 
  Opuntia basilaris Engelm. & J.M. Bigelow Native OPBA2

  beavertail pricklypear · Cactaceae 8 counties
• 
  Opuntia basilaris Engelm. & J.M. Bigelow var. basilaris Native OPBAB2

  beavertail pricklypear · Cactaceae 7 counties
• 
  Opuntia basilaris Engelm. & J.M. Bigelow var. brachyclada (Griffiths) Munz Native OPBAB

  beavertail pricklypear · Cactaceae 2 counties
• 
  Opuntia basilaris Engelm. & J.M. Bigelow var. treleasei (J.M. Coult.) J.M. Coult. ex Toumey Native OPBAT

  Trelease's beavertail pricklypear · Cactaceae 1 county
• 
  Opuntia chlorotica Engelm. & J.M. Bigelow Native OPCH

  dollarjoint pricklypear · Cactaceae 4 counties
• 
  Opuntia engelmannii Salm-Dyck ex Engelm. Native OPEN3

  cactus apple · Cactaceae 1 county
• 
  Opuntia engelmannii Salm-Dyck ex Engelm. var. engelmannii Native OPENE

  cactus apple · Cactaceae 1 county
• 
  Opuntia fragilis (Nutt.) Haw. Native OPFR

  brittle pricklypear · Cactaceae 1 county
• 
  Opuntia littoralis (Engelm.) Cockerell Native OPLI3

  coastal pricklypear · Cactaceae 8 counties
• 
  Opuntia littoralis (Engelm.) Cockerell var. littoralis Native OPLIL3

  coastal pricklypear · Cactaceae 1 county
• 
  Opuntia oricola Philbrick Native OPOR

  chaparral pricklypear · Cactaceae 5 counties
• 
  Opuntia phaeacantha Engelm. Native OPPH

  tulip pricklypear · Cactaceae 7 counties
• 
  Opuntia polyacantha Haw. Native OPPO

  plains pricklypear · Cactaceae 7 counties
• 
  Opuntia polyacantha Haw. var. erinacea (Engelm. & J.M. Bigelow ex Engelm.) Parfitt Native OPPOE

  grizzlybear pricklypear · Cactaceae 7 counties
• 
  Opuntia polyacantha Haw. var. polyacantha Native OPPOP

  hairspine pricklypear · Cactaceae 5 counties
• ⚘
  Opuntia ×curvospina Griffiths (pro sp.) [chlorotica × phaeacantha] Native OPCU2

  searchlight pricklypear · Cactaceae 1 county
• ⚘
  Opuntia ×demissa Griffiths (pro sp.) [ficus-indica × sp.] Native OPDE

  pricklypear · Cactaceae 1 county
• ⚘
  Opuntia ×occidentalis Engelm. & J.M. Bigelow (pro sp.) [littoralis × (engelmannii × phaeacantha)] Native OPOC2

  pricklypear · Cactaceae 4 counties
• ⚘
  Opuntia ×vaseyi (J.M. Coult.) Britton & Rose [littoralis × phaeacantha] Native OPVA4

  Vasey's coastal pricklypear · Cactaceae 5 counties
• 
  Orcuttia californica Vasey Native ORCA

  California Orcutt grass · Poaceae 4 counties
• 
  Orcuttia inaequalis Hoover Native ORIN

  San Joaquin Valley Orcutt grass · Poaceae 5 counties