Wisconsin

• Adams 55001
  1,200 taxa Open ↗
• Ashland 55003
  1,200 taxa Open ↗
• Barron 55005
  823 taxa Open ↗
• Bayfield 55007
  1,332 taxa Open ↗
• Brown 55009
  1,537 taxa Open ↗
• Buffalo 55011
  853 taxa Open ↗
• Burnett 55013
  863 taxa Open ↗
• Calumet 55015
  578 taxa Open ↗
• Chippewa 55017
  984 taxa Open ↗
• Clark 55019
  762 taxa Open ↗

Showing 1,551–1,600 of 2,520 (native).

• 
  Oligoneuron ohioense (Frank ex Riddell) G.N. Jones Native OLOH

  Ohio goldenrod · Asteraceae 9 counties
• 
  Oligoneuron riddellii (Frank ex Riddell) Rydb. Native OLRI2

  Riddell's goldenrod · Asteraceae 18 counties
• 
  Oligoneuron rigidum (L.) Small Native OLRI

  stiff goldenrod · Asteraceae 45 counties
• 
  Oligoneuron rigidum (L.) Small var. humile (Porter) G.L. Nesom Native OLRIH

  stiff goldenrod · Asteraceae 1 county
• 
  Oligoneuron rigidum (L.) Small var. rigidum Native OLRIR

  stiff goldenrod · Asteraceae 45 counties
• ⚘
  Oligoneuron ×bernardii (B. Boivin) G.L. Nesom [album × riddellii] Native OLBE

  goldenrod · Asteraceae 3 counties
• 
  Omalotheca sylvatica (L.) Sch. Bip. & F.W. Schultz Native OMSY

  woodland arctic cudweed · Asteraceae 1 county
• 
  Onoclea sensibilis L. Native ONSE

  sensitive fern · Dryopteridaceae 71 counties
• 
  Onosmodium bejariense DC. ex A. DC. Native ONBE

  soft-hair marbleseed · Boraginaceae 19 counties
• 
  Onosmodium bejariense DC. ex A. DC. var. bejariense Native ONBEB

  soft-hair marbleseed · Boraginaceae 1 county
• 
  Onosmodium bejariense DC. ex A. DC. var. hispidissimum (Mack.) B.L. Turner Native ONBEH

  softhair marbleseed · Boraginaceae 18 counties
• 
  Onosmodium bejariense DC. ex A. DC. var. occidentale (Mack.) B.L. Turner Native ONBEO

  western marbleseed · Boraginaceae 8 counties
• 
  Ophioglossum pusillum Raf. Native OPPU3

  northern adderstongue · Ophioglossaceae 25 counties
• 
  Ophioglossum vulgatum L. Native OPVU

  southern adderstongue · Ophioglossaceae 19 counties
• 
  Opuntia fragilis (Nutt.) Haw. Native OPFR

  brittle pricklypear · Cactaceae 16 counties
• 
  Opuntia humifusa (Raf.) Raf. Native OPHU

  devil's-tongue · Cactaceae 3 counties
• 
  Opuntia macrorhiza Engelm. Native OPMA2

  twistspine pricklypear · Cactaceae 12 counties
• 
  Opuntia macrorhiza Engelm. var. macrorhiza Native OPMAM3

  twistspine pricklypear · Cactaceae 12 counties
• 
  Orobanche fasciculata Nutt. Native ORFA

  clustered broomrape · Orobanchaceae 8 counties
• 
  Orobanche ludoviciana Nutt. Native ORLU

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

  Louisiana broomrape · Orobanchaceae 1 county
• 
  Orobanche uniflora L. Native ORUN

  oneflowered broomrape · Orobanchaceae 20 counties
• 
  Orthilia secunda (L.) House Native ORSE

  sidebells wintergreen · Pyrolaceae 35 counties
• 
  Oryzopsis asperifolia Michx. Native ORAS

  roughleaf ricegrass · Poaceae 46 counties
• 
  Osmorhiza berteroi DC. Native OSBE

  sweetcicely · Apiaceae 5 counties
• 
  Osmorhiza claytonii (Michx.) C.B. Clarke Native OSCL

  Clayton's sweetroot · Apiaceae 64 counties
• 
  Osmorhiza longistylis (Torr.) DC. Native OSLO

  longstyle sweetroot · Apiaceae 42 counties
• 
  Osmunda cinnamomea L. Native OSCI

  cinnamon fern · Osmundaceae 71 counties
• 
  Osmunda cinnamomea L. var. cinnamomea Native OSCIC

  cinnamon fern · Osmundaceae 71 counties
• 
  Osmunda claytoniana L. Native OSCL2

  interrupted fern · Osmundaceae 70 counties
• 
  Osmunda regalis L. Native OSRE

  royal fern · Osmundaceae 66 counties
• 
  Osmunda regalis L. var. spectabilis (Willd.) A. Gray Native OSRES

  royal fern · Osmundaceae 66 counties
• ⚘
  Osmunda ×ruggii R. Tryon [claytoniana × regalis] Native OSRU

  osmunda · Osmundaceae 1 county
• 
  Ostrya virginiana (Mill.) K. Koch Native OSVI

  hophornbeam · Betulaceae 61 counties
• 
  Oxalis corniculata L. Native OXCO

  creeping woodsorrel · Oxalidaceae 5 counties
• 
  Oxalis dillenii Jacq. Native OXDI2

  slender yellow woodsorrel · Oxalidaceae 50 counties
• 
  Oxalis montana Raf. Native OXMO

  mountain woodsorrel · Oxalidaceae 20 counties
• 
  Oxalis stricta L. Native OXST

  common yellow oxalis · Oxalidaceae 66 counties
• 
  Oxalis violacea L. Native OXVI

  violet woodsorrel · Oxalidaceae 30 counties
• 
  Oxypolis rigidior (L.) Raf. Native OXRI

  stiff cowbane · Apiaceae 30 counties
• 
  Oxytropis campestris (L.) DC. Native OXCA4

  field locoweed · Fabaceae 3 counties
• 
  Oxytropis campestris (L.) DC. var. chartacea (Fassett) Barneby Native OXCAC

  field locoweed · Fabaceae 3 counties
• 
  Packera aurea (L.) Á. Löve & D. Löve Native PAAU3

  golden ragwort · Asteraceae 54 counties
• 
  Packera indecora (Greene) Á. Löve & D. Löve Native PAIN11

  elegant groundsel · Asteraceae 2 counties
• 
  Packera paupercula (Michx.) Á. Löve & D. Löve Native PAPA20

  balsam groundsel · Asteraceae 51 counties
• 
  Packera plattensis (Nutt.) W.A. Weber & Á. Löve Native PAPL12

  prairie groundsel · Asteraceae 14 counties
• 
  Packera pseudaurea (Rydb.) W.A. Weber & Á. Löve Native PAPS5

  falsegold groundsel · Asteraceae 8 counties
• 
  Packera pseudaurea (Rydb.) W.A. Weber & Á. Löve var. semicordata (Mack. & Bush) D.K. Trock & T.M. Barkley Native PAPSS

  falsegold groundsel · Asteraceae 8 counties
• 
  Panax quinquefolius L. Native PAQU

  American ginseng · Araliaceae 35 counties
• 
  Panax trifolius L. Native PATR2

  dwarf ginseng · Araliaceae 39 counties