Ohio

• Adams 39001
  1,331 taxa Open ↗
• Allen 39003
  1,038 taxa Open ↗
• Ashland 39005
  998 taxa Open ↗
• Ashtabula 39007
  1,437 taxa Open ↗
• Athens 39009
  1,149 taxa Open ↗
• Auglaize 39011
  958 taxa Open ↗
• Belmont 39013
  945 taxa Open ↗
• Brown 39015
  629 taxa Open ↗
• Butler 39017
  850 taxa Open ↗
• Carroll 39019
  933 taxa Open ↗

Showing 2,051–2,100 of 3,424.

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  Nuttallanthus canadensis (L.) D.A. Sutton Native NUCA

  Canada toadflax · Scrophulariaceae 8 counties
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  Nymphaea odorata Aiton Native NYOD

  American white waterlily · Nymphaeaceae 35 counties
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  Nymphaea odorata Aiton ssp. odorata Native NYODO

  American white waterlily · Nymphaeaceae 1 county
• ⚘
  Nymphaea odorata Aiton ssp. tuberosa (Paine) Wiersma & Hellquist Native NYODT

  American white waterlily · Nymphaeaceae 1 county
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  Nymphoides peltata (S.G. Gmel.) Kuntze Introduced NYPE

  yellow floatingheart · Menyanthaceae 2 counties
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  Nyssa sylvatica Marshall Native NYSY

  blackgum · Cornaceae 75 counties
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  Obolaria virginica L. Native OBVI

  Virginia pennywort · Gentianaceae 28 counties
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  Oclemena acuminata (Michx.) Greene Native OCAC

  whorled wood aster · Asteraceae 2 counties
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  Oenanthe aquatica (L.) Poir. Introduced OEAQ

  fineleaf waterdropwort · Apiaceae 1 county
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  Oenothera biennis L. Native OEBI

  common evening primrose · Onagraceae 79 counties
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  Oenothera curtiflora W.L. Wagner & Hoch Native OECU2

  velvetweed · Onagraceae 3 counties
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  Oenothera filiformis (Small) W.L. Wagner & Hoch Native OEFI2

  longflower beeblossom · Onagraceae 1 county
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  Oenothera fruticosa L. Native OEFR

  narrowleaf evening primrose · Onagraceae 43 counties
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  Oenothera fruticosa L. ssp. fruticosa Native OEFRF

  narrowleaf evening primrose · Onagraceae 9 counties
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  Oenothera fruticosa L. ssp. tetragona (Roth) W.L. Wagner Native OEFRT

  narrowleaf evening primrose · Onagraceae 35 counties
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  Oenothera gaura W.L. Wagner & Hoch Native OEGA

  biennial beeblossom · Onagraceae 76 counties
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  Oenothera laciniata Hill Native OELA

  cutleaf evening primrose · Onagraceae 27 counties
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  Oenothera nutans Atk. & Bartlett Native OENU2

  nodding evening primrose · Onagraceae 4 counties
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  Oenothera oakesiana (A. Gray) J.W. Robbins ex S. Watson & J.M. Coult. Native OEOA

  Oakes' evening primrose · Onagraceae 1 county
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  Oenothera parviflora L. Native OEPA5

  northern evening primrose · Onagraceae 4 counties
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  Oenothera perennis L. Native OEPE

  little evening primrose · Onagraceae 43 counties
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  Oenothera pilosella Raf. Native OEPI2

  meadow evening primrose · Onagraceae 24 counties
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  Oenothera pilosella Raf. ssp. pilosella Native OEPIP

  meadow evening primrose · Onagraceae 24 counties
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  Oenothera speciosa Nutt. Native OESP2

  pinkladies · Onagraceae 7 counties
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  Oenothera triloba Nutt. Native OETR2

  stemless evening primrose · Onagraceae 1 county
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  Oenothera villosa Thunb. Native OEVI

  hairy evening primrose · Onagraceae 7 counties
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  Oenothera villosa Thunb. ssp. villosa Native OEVIV

  hairy evening primrose · Onagraceae 7 counties
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  Oligoneuron album (Nutt.) G.L. Nesom Native OLAL2

  prairie goldenrod · Asteraceae 3 counties
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  Oligoneuron ohioense (Frank ex Riddell) G.N. Jones Native OLOH

  Ohio goldenrod · Asteraceae 18 counties
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  Oligoneuron riddellii (Frank ex Riddell) Rydb. Native OLRI2

  Riddell's goldenrod · Asteraceae 25 counties
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  Oligoneuron rigidum (L.) Small Native OLRI

  stiff goldenrod · Asteraceae 18 counties
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  Oligoneuron rigidum (L.) Small var. rigidum Native OLRIR

  stiff goldenrod · Asteraceae 18 counties
• 
  Onoclea sensibilis L. Native ONSE

  sensitive fern · Dryopteridaceae 83 counties
• 
  Onopordum acanthium L. Introduced ONAC

  Scotch cottonthistle · Asteraceae 11 counties
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  Onosmodium bejariense DC. ex A. DC. Native ONBE

  soft-hair marbleseed · Boraginaceae 18 counties
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  Onosmodium bejariense DC. ex A. DC. var. hispidissimum (Mack.) B.L. Turner Native ONBEH

  softhair marbleseed · Boraginaceae 18 counties
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  Ophioglossum pusillum Raf. Native OPPU3

  northern adderstongue · Ophioglossaceae 6 counties
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  Ophioglossum vulgatum L. Native OPVU

  southern adderstongue · Ophioglossaceae 29 counties
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  Opuntia humifusa (Raf.) Raf. Native OPHU

  devil's-tongue · Cactaceae 16 counties
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  Opuntia macrorhiza Engelm. Native OPMA2

  twistspine pricklypear · Cactaceae 1 county
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  Opuntia macrorhiza Engelm. var. macrorhiza Native OPMAM3

  twistspine pricklypear · Cactaceae 1 county
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  Orbexilum onobrychis (Nutt.) Rydb. Native ORON

  French-grass · Fabaceae 23 counties
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  Orbexilum pedunculatum (Mill.) Rydb. Native ORPE

  Sampson's snakeroot · Fabaceae 8 counties
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  Orbexilum pedunculatum (Mill.) Rydb. var. pedunculatum Native ORPEP2

  Sampson's snakeroot · Fabaceae 8 counties
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  Origanum vulgare L. Introduced ORVU

  oregano · Lamiaceae 3 counties
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  Ornithogalum nutans L. Introduced ORNU

  drooping star of Bethlehem · Liliaceae 1 county
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  Ornithogalum umbellatum L. Introduced ORUM

  star of Bethlehem · Liliaceae 12 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 riparia L.T. Collins Native ORRI

  River Broom-Rape · Orobanchaceae 3 counties