Oregon

• Baker 41001
  1,572 taxa Open ↗
• Benton 41003
  1,855 taxa Open ↗
• Clackamas 41005
  1,485 taxa Open ↗
• Clatsop 41007
  979 taxa Open ↗
• Columbia 41009
  1,183 taxa Open ↗
• Coos 41011
  1,238 taxa Open ↗
• Crook 41013
  1,354 taxa Open ↗
• Curry 41015
  1,738 taxa Open ↗
• Deschutes 41017
  1,482 taxa Open ↗
• Douglas 41019
  2,250 taxa Open ↗

Showing 2,951–3,000 of 4,583 (native).

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  Notholithocarpus densiflorus (Hook. & Arn.) P.S. Manos, C.H. Cannon, & S.H. Oh Native NODE3

  tanoak · Fagaceae 6 counties
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  Notholithocarpus densiflorus (Hook. & Arn.) P.S. Manos, C.H. Cannon, & S.H. Oh var. densiflorus Native NODED

  tanoak · Fagaceae 6 counties
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  Notholithocarpus densiflorus (Hook. & Arn.) P.S. Manos, C.H. Cannon, & S.H. Oh var. echinoides (R.Br. ter) P.S. Manos, C.H. Cannon & S.H. Oh Native NODEE

  tanoak · Fagaceae 4 counties
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  Nuphar lutea (L.) Sm. Native NULU

  yellow pond-lily · Nymphaeaceae 20 counties
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  Nuphar lutea (L.) Sm. ssp. polysepala (Engelm.) E.O. Beal Native NULUP

  Rocky Mountain pond-lily · Nymphaeaceae 20 counties
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  Nuttallanthus canadensis (L.) D.A. Sutton Native NUCA

  Canada toadflax · Scrophulariaceae 6 counties
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  Nuttallanthus texanus (Scheele) D.A. Sutton Native NUTE

  Texas toadflax · Scrophulariaceae 6 counties
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  Nymphaea odorata Aiton Native NYOD

  American white waterlily · Nymphaeaceae 8 counties
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  Nymphaea odorata Aiton ssp. odorata Native NYODO

  American white waterlily · Nymphaeaceae 8 counties
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  Oemleria cerasiformis (Torr. & A. Gray ex Hook. & Arn.) Landon Native OECE

  Indian plum · Rosaceae 19 counties
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  Oenanthe sarmentosa C. Presl ex DC. Native OESA

  water parsely · Apiaceae 22 counties
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  Oenothera biennis L. Native OEBI

  common evening primrose · Onagraceae 11 counties
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  Oenothera caespitosa Nutt. Native OECA10

  tufted evening primrose · Onagraceae 12 counties
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  Oenothera caespitosa Nutt. ssp. caespitosa Native OECAC2

  tufted evening primrose · Onagraceae 10 counties
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  Oenothera caespitosa Nutt. ssp. marginata (Nutt. ex Hook. & Arn.) Munz Native OECAM4

  tufted evening primrose · Onagraceae 6 counties
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  Oenothera curtiflora W.L. Wagner & Hoch Native OECU2

  velvetweed · Onagraceae 6 counties
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  Oenothera deltoides Torr. & Frém. Native OEDE2

  birdcage evening primrose · Onagraceae 9 counties
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  Oenothera deltoides Torr. & Frém. ssp. piperi (Munz) W. Klein Native OEDEP

  Piper's evening primrose · Onagraceae 9 counties
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  Oenothera elata Kunth Native OEEL

  Hooker's evening primrose · Onagraceae 11 counties
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  Oenothera elata Kunth ssp. hirsutissima (A. Gray ex S. Watson) W. Dietr. Native OEELH

  Hooker's evening primrose · Onagraceae 11 counties
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  Oenothera flava (A. Nelson) Garrett Native OEFL

  yellow evening primrose · Onagraceae 4 counties
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  Oenothera flava (A. Nelson) Garrett ssp. flava Native OEFLF

  yellow evening primrose · Onagraceae 4 counties
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  Oenothera pallida Lindl. Native OEPA

  pale evening primrose · Onagraceae 10 counties
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  Oenothera pallida Lindl. ssp. pallida Native OEPAP

  pale evening primrose · Onagraceae 10 counties
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  Oenothera villosa Thunb. Native OEVI

  hairy evening primrose · Onagraceae 21 counties
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  Oenothera villosa Thunb. ssp. strigosa (Rydb.) W. Dietr. & P.H. Raven Native OEVIS

  hairy evening primrose · Onagraceae 21 counties
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  Oenothera wolfii (Munz) P.H. Raven, W. Dietr. & Stubbe Native OEWO

  Wolf's evening primrose · Onagraceae 2 counties
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  Olsynium douglasii (A. Dietr.) E.P. Bicknell Native OLDO

  Douglas' grasswidow · Iridaceae 26 counties
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  Olsynium douglasii (A. Dietr.) E.P. Bicknell var. douglasii Native OLDOD

  Douglas' grasswidow · Iridaceae 14 counties
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  Olsynium douglasii (A. Dietr.) E.P. Bicknell var. inflatum (Suksd.) Cholewa & Douglass M. Hend. Native OLDOI

  inflated grasswidow · Iridaceae 13 counties
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  Ophioglossum pusillum Raf. Native OPPU3

  northern adderstongue · Ophioglossaceae 5 counties
• 
  Oplopanax horridus (Sm.) Miq. Native OPHO

  devilsclub · Araliaceae 16 counties
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  Opuntia fragilis (Nutt.) Haw. Native OPFR

  brittle pricklypear · Cactaceae 7 counties
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  Opuntia polyacantha Haw. Native OPPO

  plains pricklypear · Cactaceae 1 county
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  Opuntia polyacantha Haw. var. polyacantha Native OPPOP

  hairspine pricklypear · Cactaceae 1 county
• ⚘
  Opuntia ×columbiana Griffiths (pro sp.) [fragilis × polyacantha] Native OPCO13

  grizzleybear pricklypear · Cactaceae 6 counties
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  Oreostemma alpigenum (Torr. & A. Gray) Greene Native ORAL4

  tundra aster · Asteraceae 19 counties
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  Oreostemma alpigenum (Torr. & A. Gray) Greene var. alpigenum Native ORALA2

  tundra aster · Asteraceae 3 counties
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  Oreostemma alpigenum (Torr. & A. Gray) Greene var. andersonii (A. Gray) G.L. Nesom Native ORALA3

  tundra aster · Asteraceae 10 counties
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  Oreostemma alpigenum (Torr. & A. Gray) Greene var. haydenii (Porter) G.L. Nesom Native ORALH

  tundra aster · Asteraceae 6 counties
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  Oreostemma elatum (Greene) Greene Native OREL4

  Plumas alpine aster · Asteraceae 1 county
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  Orobanche californica Cham. & Schltdl. Native ORCA2

  California broomrape · Orobanchaceae 16 counties
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  Orobanche californica Cham. & Schltdl. ssp. californica Native ORCAC2

  California broomrape · Orobanchaceae 5 counties
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  Orobanche californica Cham. & Schltdl. ssp. grayana (G. Beck) Heckard Native ORCAG2

  Gray's broomrape · Orobanchaceae 9 counties
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  Orobanche corymbosa (Rydb.) Ferris Native ORCO5

  flat-top broomrape · Orobanchaceae 5 counties
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  Orobanche corymbosa (Rydb.) Ferris ssp. corymbosa Native ORCOC3

  flat-top broomrape · Orobanchaceae 5 counties
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  Orobanche fasciculata Nutt. Native ORFA

  clustered broomrape · Orobanchaceae 20 counties
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  Orobanche ludoviciana Nutt. Native ORLU

  Louisiana broomrape · Orobanchaceae 2 counties
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  Orobanche ludoviciana Nutt. ssp. ludoviciana Native ORLUL2

  Louisiana broomrape · Orobanchaceae 2 counties
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  Orobanche pinorum Geyer ex Hook. Native ORPI2

  conifer broomrape · Orobanchaceae 9 counties