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 6,001–6,050 of 8,499 (native).

• 
  Orcuttia pilosa Hoover Native ORPI

  hairy Orcutt grass · Poaceae 6 counties
• 
  Orcuttia tenuis Hitchc. Native ORTE

  slender Orcutt grass · Poaceae 9 counties
• 
  Orcuttia viscida (Hoover) J. Reeder Native ORVI2

  Sacramento Orcutt grass · Poaceae 1 county
• 
  Oreonana clementis (M.E. Jones) Jeps. Native ORCL

  pygmy mountainparsley · Apiaceae 4 counties
• 
  Oreonana purpurascens Shevock & Constance Native ORPU5

  purple mountainparsley · Apiaceae 1 county
• 
  Oreonana vestita (S. Watson) Jeps. Native ORVE

  woolly mountainparsley · Apiaceae 3 counties
• 
  Oreostemma alpigenum (Torr. & A. Gray) Greene Native ORAL4

  tundra aster · Asteraceae 24 counties
• 
  Oreostemma alpigenum (Torr. & A. Gray) Greene var. andersonii (A. Gray) G.L. Nesom Native ORALA3

  tundra aster · Asteraceae 23 counties
• 
  Oreostemma alpigenum (Torr. & A. Gray) Greene var. haydenii (Porter) G.L. Nesom Native ORALH

  tundra aster · Asteraceae 1 county
• 
  Oreostemma elatum (Greene) Greene Native OREL4

  Plumas alpine aster · Asteraceae 3 counties
• 
  Oreostemma peirsonii (Sharsm.) G.L. Nesom Native ORPE4

  Peirson's aster · Asteraceae 3 counties
• 
  Ornithostaphylos oppositifolia (Parry) Small Native OROP

  Baja birdbush · Ericaceae 1 county
• 
  Orobanche bulbosa (A. Gray) G. Beck Native ORBU

  chaparral broomrape · Orobanchaceae 26 counties
• 
  Orobanche californica Cham. & Schltdl. Native ORCA2

  California broomrape · Orobanchaceae 32 counties
• 
  Orobanche californica Cham. & Schltdl. ssp. californica Native ORCAC2

  California broomrape · Orobanchaceae 14 counties
• 
  Orobanche californica Cham. & Schltdl. ssp. condensa Heckard Native ORCAC

  California broomrape · Orobanchaceae 1 county
• 
  Orobanche californica Cham. & Schltdl. ssp. feudgei (Munz) Heckard Native ORCAF

  California broomrape · Orobanchaceae 8 counties
• 
  Orobanche californica Cham. & Schltdl. ssp. grandis Heckard Native ORCAG

  California broomrape · Orobanchaceae 4 counties
• 
  Orobanche californica Cham. & Schltdl. ssp. grayana (G. Beck) Heckard Native ORCAG2

  Gray's broomrape · Orobanchaceae 7 counties
• 
  Orobanche californica Cham. & Schltdl. ssp. jepsonii (Munz) Heckard Native ORCAJ

  Jepson's broomrape · Orobanchaceae 15 counties
• 
  Orobanche cooperi (A. Gray) A. Heller Native ORCO4

  desert broomrape · Orobanchaceae 7 counties
• 
  Orobanche corymbosa (Rydb.) Ferris Native ORCO5

  flat-top broomrape · Orobanchaceae 12 counties
• 
  Orobanche corymbosa (Rydb.) Ferris ssp. corymbosa Native ORCOC3

  flat-top broomrape · Orobanchaceae 12 counties
• 
  Orobanche fasciculata Nutt. Native ORFA

  clustered broomrape · Orobanchaceae 39 counties
• 
  Orobanche ludoviciana Nutt. Native ORLU

  Louisiana broomrape · Orobanchaceae 1 county
• 
  Orobanche ludoviciana Nutt. ssp. ludoviciana Native ORLUL2

  Louisiana broomrape · Orobanchaceae 1 county
• 
  Orobanche parishii (Jeps.) Heckard Native ORPA2

  Parish's broomrape · Orobanchaceae 9 counties
• 
  Orobanche parishii (Jeps.) Heckard ssp. brachyloba Heckard Native ORPAB

  Parish's broomrape · Orobanchaceae 5 counties
• 
  Orobanche parishii (Jeps.) Heckard ssp. parishii Native ORPAP

  Parish's broomrape · Orobanchaceae 7 counties
• 
  Orobanche pinorum Geyer ex Hook. Native ORPI2

  conifer broomrape · Orobanchaceae 11 counties
• 
  Orobanche uniflora L. Native ORUN

  oneflowered broomrape · Orobanchaceae 26 counties
• 
  Orobanche valida Jeps. Native ORVA

  Rock Creek broomrape · Orobanchaceae 8 counties
• 
  Orobanche valida Jeps. ssp. howellii Heckard & T.S. Collins Native ORVAH

  Howell's broomrape · Orobanchaceae 6 counties
• 
  Orobanche valida Jeps. ssp. valida Native ORVAV

  Rock Creek broomrape · Orobanchaceae 2 counties
• 
  Orobanche vallicola (Jeps.) Heckard Native ORVA2

  hillside broomrape · Orobanchaceae 14 counties
• 
  Orochaenactis thysanocarpha (A. Gray) Coville Native ORTH

  California mountainpincushion · Asteraceae 3 counties
• 
  Orogenia fusiformis S. Watson Native ORFU

  California Indian potato · Apiaceae 7 counties
• 
  Orthilia secunda (L.) House Native ORSE

  sidebells wintergreen · Pyrolaceae 19 counties
• 
  Orthocarpus bracteosus Benth. Native ORBR

  rosy owl's-clover · Scrophulariaceae 5 counties
• 
  Orthocarpus cuspidatus Greene Native ORCU

  toothed owl's-clover · Scrophulariaceae 23 counties
• 
  Orthocarpus cuspidatus Greene ssp. copelandii (Eastw.) T.I. Chuang & Heckard Native ORCUC

  Copeland's owl's-clover · Scrophulariaceae 5 counties
• 
  Orthocarpus cuspidatus Greene ssp. cryptanthus (Piper) T.I. Chuang & Heckard Native ORCUC2

  cryptantha owl's-clover · Scrophulariaceae 19 counties
• 
  Orthocarpus cuspidatus Greene ssp. cuspidatus Native ORCUC3

  Siskiyou Mountain owl's-clover · Scrophulariaceae 2 counties
• 
  Orthocarpus imbricatus Torr. ex S. Watson Native ORIM

  mountain owl's-clover · Scrophulariaceae 7 counties
• 
  Orthocarpus luteus Nutt. Native ORLU2

  yellow owl's-clover · Scrophulariaceae 11 counties
• 
  Orthocarpus pachystachyus A. Gray Native ORPA

  Shasta owl's-clover · Scrophulariaceae 1 county
• 
  Oryctes nevadensis S. Watson Native ORNE

  Nevada oryctes · Solanaceae 1 county
• 
  Osmadenia tenella Nutt. Native OSTE

  false rosinweed · Asteraceae 5 counties
• 
  Osmorhiza berteroi DC. Native OSBE

  sweetcicely · Apiaceae 42 counties
• 
  Osmorhiza brachypoda Torr. Native OSBR

  California sweetcicely · Apiaceae 23 counties