Arkansas

• Arkansas 05001
  816 taxa Open ↗
• Ashley 05003
  1,236 taxa Open ↗
• Baxter 05005
  1,025 taxa Open ↗
• Benton 05007
  1,372 taxa Open ↗
• Boone 05009
  697 taxa Open ↗
• Bradley 05011
  1,145 taxa Open ↗
• Calhoun 05013
  573 taxa Open ↗
• Carroll 05015
  1,039 taxa Open ↗
• Chicot 05017
  440 taxa Open ↗
• Clark 05019
  896 taxa Open ↗

Showing 2,001–2,050 of 3,277.

• 
  Opuntia pusilla (Haw.) Haw. Native OPPU2

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

  French-grass · Fabaceae 2 counties
• 
  Orbexilum pedunculatum (Mill.) Rydb. Native ORPE

  Sampson's snakeroot · Fabaceae 46 counties
• 
  Orbexilum pedunculatum (Mill.) Rydb. var. pedunculatum Native ORPEP2

  Sampson's snakeroot · Fabaceae 46 counties
• 
  Orbexilum simplex (Nutt. ex Torr. & A. Gray) Rydb. Native ORSI

  singlestem leather-root · Fabaceae 12 counties
• 
  Ornithogalum caudatum Aiton Introduced ORCA6

  false seaonion · Liliaceae 1 county
• 
  Ornithogalum umbellatum L. Introduced ORUM

  star of Bethlehem · Liliaceae 24 counties
• 
  Orobanche uniflora L. Native ORUN

  oneflowered broomrape · Orobanchaceae 14 counties
• 
  Oryza sativa L. Introduced ORSA

  rice · Poaceae 9 counties
• 
  Osmorhiza claytonii (Michx.) C.B. Clarke Native OSCL

  Clayton's sweetroot · Apiaceae 1 county
• 
  Osmorhiza longistylis (Torr.) DC. Native OSLO

  longstyle sweetroot · Apiaceae 28 counties
• 
  Osmunda cinnamomea L. Native OSCI

  cinnamon fern · Osmundaceae 51 counties
• 
  Osmunda cinnamomea L. var. cinnamomea Native OSCIC

  cinnamon fern · Osmundaceae 1 county
• 
  Osmunda claytoniana L. Native OSCL2

  interrupted fern · Osmundaceae 2 counties
• 
  Osmunda regalis L. Native OSRE

  royal fern · Osmundaceae 54 counties
• 
  Osmunda regalis L. var. spectabilis (Willd.) A. Gray Native OSRES

  royal fern · Osmundaceae 54 counties
• 
  Ostrya virginiana (Mill.) K. Koch Native OSVI

  hophornbeam · Betulaceae 70 counties
• 
  Oxalis corniculata L. Native OXCO

  creeping woodsorrel · Oxalidaceae 33 counties
• 
  Oxalis dillenii Jacq. Native OXDI2

  slender yellow woodsorrel · Oxalidaceae 13 counties
• 
  Oxalis rubra A. St.-Hil. Introduced OXRU

  windowbox woodsorrel · Oxalidaceae 16 counties
• 
  Oxalis stricta L. Native OXST

  common yellow oxalis · Oxalidaceae 69 counties
• 
  Oxalis violacea L. Native OXVI

  violet woodsorrel · Oxalidaceae 63 counties
• 
  Oxypolis rigidior (L.) Raf. Native OXRI

  stiff cowbane · Apiaceae 18 counties
• 
  Packera anonyma (Alph. Wood) W.A. Weber & Á. Löve Native PAAN6

  Small's ragwort · Asteraceae 1 county
• 
  Packera aurea (L.) Á. Löve & D. Löve Native PAAU3

  golden ragwort · Asteraceae 16 counties
• 
  Packera glabella (Poir.) C. Jeffrey Native PAGL17

  butterweed · Asteraceae 56 counties
• 
  Packera obovata (Muhl. ex Willd.) W.A. Weber & Á. Löve Native PAOB6

  roundleaf ragwort · Asteraceae 47 counties
• 
  Packera plattensis (Nutt.) W.A. Weber & Á. Löve Native PAPL12

  prairie groundsel · Asteraceae 19 counties
• 
  Packera tomentosa (Michx.) C. Jeffrey Native PATO4

  woolly ragwort · Asteraceae 38 counties
• 
  Palafoxia callosa (Nutt.) Torr. & A. Gray Native PACA3

  small palafox · Asteraceae 13 counties
• 
  Panax quinquefolius L. Native PAQU

  American ginseng · Araliaceae 18 counties
• 
  Panicum anceps Michx. Native PAAN

  beaked panicgrass · Poaceae 57 counties
• 
  Panicum brachyanthum Steud. Native PABR2

  prairie panicgrass · Poaceae 9 counties
• 
  Panicum capillare L. Native PACA6

  witchgrass · Poaceae 19 counties
• 
  Panicum dichotomiflorum Michx. Native PADI

  fall panicgrass · Poaceae 52 counties
• 
  Panicum dichotomiflorum Michx. var. dichotomiflorum Native PADID

  fall panicgrass · Poaceae 52 counties
• 
  Panicum flexile (Gattinger) Scribn. Native PAFL2

  wiry panicgrass · Poaceae 21 counties
• 
  Panicum gattingeri Nash Native PAGA

  Gattinger's panicgrass · Poaceae 4 counties
• 
  Panicum hemitomon Schult. Native PAHE2

  maidencane · Poaceae 1 county
• 
  Panicum obtusum Kunth Native PAOB

  vine mesquite · Poaceae 2 counties
• 
  Panicum philadelphicum Bernh. ex Trin. Native PAPH

  Philadelphia panicgrass · Poaceae 18 counties
• 
  Panicum rigidulum Bosc ex Nees Native PARI4

  redtop panicgrass · Poaceae 49 counties
• 
  Panicum rigidulum Bosc ex Nees var. pubescens (Vasey) Lelong Native PARIP

  redtop panicgrass · Poaceae 1 county
• 
  Panicum rigidulum Bosc ex Nees var. rigidulum Native PARIR

  redtop panicgrass · Poaceae 2 counties
• 
  Panicum verrucosum Muhl. Native PAVE2

  warty panicgrass · Poaceae 6 counties
• 
  Panicum virgatum L. Native PAVI2

  switchgrass · Poaceae 36 counties
• 
  Panicum virgatum L. var. virgatum Native PAVIV

  switchgrass · Poaceae 36 counties
• 
  Papaver dubium L. Introduced PADU

  blindeyes · Papaveraceae 9 counties
• 
  Papaver rhoeas L. Introduced PARH2

  corn poppy · Papaveraceae 4 counties
• 
  Papaver somniferum L. Introduced PASO2

  opium poppy · Papaveraceae 1 county