Louisiana

• Acadia 22001
  964 taxa Open ↗
• Allen 22003
  1,426 taxa Open ↗
• Ascension 22005
  551 taxa Open ↗
• Assumption 22007
  456 taxa Open ↗
• Avoyelles 22009
  803 taxa Open ↗
• Beauregard 22011
  1,018 taxa Open ↗
• Bienville 22013
  1,400 taxa Open ↗
• Bossier 22015
  1,395 taxa Open ↗
• Caddo 22017
  1,796 taxa Open ↗
• Calcasieu 22019
  1,531 taxa Open ↗

Showing 2,201–2,250 of 3,739.

• 
  Oenothera sinuosa W.L. Wagner & Hoch Native OESI3

  wavyleaf beeblossom · Onagraceae 2 counties
• 
  Oenothera spachiana Torr. & A. Gray Native OESP

  Spach's evening primrose · Onagraceae 18 counties
• 
  Oenothera speciosa Nutt. Native OESP2

  pinkladies · Onagraceae 64 counties
• 
  Oenothera suffrutescens (Ser.) W.L. Wagner & Hoch Native OESU3

  scarlet beeblossom · Onagraceae 6 counties
• 
  Oenothera triloba Nutt. Native OETR2

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

  hairy evening primrose · Onagraceae 1 county
• 
  Oenothera villosa Thunb. ssp. villosa Native OEVIV

  hairy evening primrose · Onagraceae 1 county
• ⚘
  Oenothera xerogaura W.L. Wagner & Hoch Native OEXE

  Drummond's beeblossom · Onagraceae 1 county
• 
  Oldenlandia boscii (DC.) Chapm. Native OLBO

  Bosc's mille graines · Rubiaceae 43 counties
• 
  Oldenlandia corymbosa L. Native OLCO

  flat-top mille graines · Rubiaceae 5 counties
• 
  Oldenlandia uniflora L. Native OLUN

  clustered mille graines · Rubiaceae 38 counties
• 
  Oligoneuron nitidum (Torr. & A. Gray) Small Native OLNI

  shiny goldenrod · Asteraceae 27 counties
• 
  Oligoneuron rigidum (L.) Small Native OLRI

  stiff goldenrod · Asteraceae 5 counties
• 
  Oligoneuron rigidum (L.) Small var. glabratum (E.L. Braun) G.L. Nesom Native OLRIG

  stiff goldenrod · Asteraceae 5 counties
• 
  Onoclea sensibilis L. Native ONSE

  sensitive fern · Dryopteridaceae 42 counties
• 
  Onosmodium bejariense DC. ex A. DC. Native ONBE

  soft-hair marbleseed · Boraginaceae 10 counties
• 
  Onosmodium bejariense DC. ex A. DC. var. bejariense Native ONBEB

  soft-hair marbleseed · Boraginaceae 10 counties
• 
  Onosmodium bejariense DC. ex A. DC. var. hispidissimum (Mack.) B.L. Turner Native ONBEH

  softhair marbleseed · Boraginaceae 8 counties
• 
  Onosmodium bejariense DC. ex A. DC. var. occidentale (Mack.) B.L. Turner Native ONBEO

  western marbleseed · Boraginaceae 1 county
• 
  Onosmodium virginianum (L.) A. DC. Native ONVI2

  wild Job's tears · Boraginaceae 16 counties
• 
  Ophioglossum crotalophoroides Walter Native OPCR

  bulbous adderstongue · Ophioglossaceae 49 counties
• 
  Ophioglossum crotalophoroides Walter var. crotalophoroides Native OPCRC

  bulbous adderstongue · Ophioglossaceae 49 counties
• 
  Ophioglossum engelmannii Prantl Native OPEN

  limestone adderstongue · Ophioglossaceae 7 counties
• 
  Ophioglossum nudicaule L. f. Native OPNU

  least adderstongue · Ophioglossaceae 30 counties
• 
  Ophioglossum petiolatum Hook. Native OPPE2

  longstem adderstongue · Ophioglossaceae 40 counties
• 
  Ophioglossum vulgatum L. Native OPVU

  southern adderstongue · Ophioglossaceae 29 counties
• 
  Oplismenus hirtellus (L.) P. Beauv. Both OPHI

  basketgrass · Poaceae 56 counties
• 
  Oplismenus hirtellus (L.) P. Beauv. ssp. setarius (Lam.) Mez ex Ekman Native OPHIS

  basketgrass · Poaceae 56 counties
• 
  Opuntia engelmannii Salm-Dyck ex Engelm. Native OPEN3

  cactus apple · Cactaceae 2 counties
• 
  Opuntia engelmannii Salm-Dyck ex Engelm. var. lindheimeri (Engelm.) Parfitt & Pinkava Native OPENL

  Texas pricklypear · Cactaceae 2 counties
• 
  Opuntia humifusa (Raf.) Raf. Native OPHU

  devil's-tongue · Cactaceae 24 counties
• 
  Opuntia macrorhiza Engelm. Native OPMA2

  twistspine pricklypear · Cactaceae 5 counties
• 
  Opuntia macrorhiza Engelm. var. macrorhiza Native OPMAM3

  twistspine pricklypear · Cactaceae 5 counties
• 
  Opuntia monacantha (Willd.) Haw. Introduced OPMO5

  common pricklypear · Cactaceae 1 county
• 
  Opuntia pusilla (Haw.) Haw. Native OPPU2

  cockspur pricklypear · Cactaceae 1 county
• 
  Opuntia stricta (Haw.) Haw. Native OPST2

  erect pricklypear · Cactaceae 1 county
• 
  Orbexilum pedunculatum (Mill.) Rydb. Native ORPE

  Sampson's snakeroot · Fabaceae 26 counties
• 
  Orbexilum pedunculatum (Mill.) Rydb. var. pedunculatum Native ORPEP2

  Sampson's snakeroot · Fabaceae 26 counties
• 
  Orbexilum simplex (Nutt. ex Torr. & A. Gray) Rydb. Native ORSI

  singlestem leather-root · Fabaceae 18 counties
• 
  Ornithogalum umbellatum L. Introduced ORUM

  star of Bethlehem · Liliaceae 13 counties
• 
  Orobanche uniflora L. Native ORUN

  oneflowered broomrape · Orobanchaceae 1 county
• 
  Orontium aquaticum L. Native ORAQ

  goldenclub · Araceae 8 counties
• 
  Oryza sativa L. Introduced ORSA

  rice · Poaceae 28 counties
• ⚘
  Osmanthus americanus (L.) Benth. & Hook. f. ex A. Gray Native OSAM

  devilwood · Oleaceae 6 counties
• ⚘
  Osmanthus americanus (L.) Benth. & Hook. f. ex A. Gray var. americanus Native OSAMA

  devilwood · Oleaceae 6 counties
• 
  Osmunda cinnamomea L. Native OSCI

  cinnamon fern · Osmundaceae 29 counties
• 
  Osmunda cinnamomea L. var. cinnamomea Native OSCIC

  cinnamon fern · Osmundaceae 29 counties
• 
  Osmunda regalis L. Native OSRE

  royal fern · Osmundaceae 51 counties
• 
  Osmunda regalis L. var. spectabilis (Willd.) A. Gray Native OSRES

  royal fern · Osmundaceae 51 counties
• 
  Ostrya virginiana (Mill.) K. Koch Native OSVI

  hophornbeam · Betulaceae 40 counties