Illinois

• Adams 17001
  1,183 taxa Open ↗
• Alexander 17003
  1,220 taxa Open ↗
• Bond 17005
  682 taxa Open ↗
• Boone 17007
  1,163 taxa Open ↗
• Brown 17009
  836 taxa Open ↗
• Bureau 17011
  652 taxa Open ↗
• Calhoun 17013
  1,017 taxa Open ↗
• Carroll 17015
  931 taxa Open ↗
• Cass 17017
  1,389 taxa Open ↗
• Champaign 17019
  1,420 taxa Open ↗

Showing 2,901–2,950 of 3,775.

• 
  Rheum rhabarbarum L. Introduced RHRH2

  garden rhubarb · Polygonaceae 3 counties
• 
  Rhexia mariana L. Native RHMA

  Maryland meadowbeauty · Melastomataceae 8 counties
• 
  Rhexia mariana L. var. mariana Native RHMAM2

  Maryland meadowbeauty · Melastomataceae 2 counties
• 
  Rhexia virginica L. Native RHVI

  handsome Harry · Melastomataceae 17 counties
• 
  Rhododendron periclymenoides (Michx.) Shinners Native RHPE4

  pink azalea · Ericaceae 1 county
• 
  Rhododendron prinophyllum (Small) Millais Native RHPR

  early azalea · Ericaceae 4 counties
• 
  Rhodotypos scandens (Thunb.) Makino Introduced RHSC3

  jetbead · Rosaceae 2 counties
• 
  Rhus aromatica Aiton Native RHAR4

  fragrant sumac · Anacardiaceae 54 counties
• 
  Rhus aromatica Aiton var. arenaria (Greene) Fernald Native RHARA

  fragrant sumac · Anacardiaceae 20 counties
• 
  Rhus aromatica Aiton var. aromatica Native RHARA2

  fragrant sumac · Anacardiaceae 1 county
• 
  Rhus aromatica Aiton var. serotina (Greene) Rehder Native RHARS

  fragrant sumac · Anacardiaceae 1 county
• 
  Rhus copallinum L. Native RHCO

  winged sumac · Anacardiaceae 54 counties
• 
  Rhus copallinum L. var. latifolia Engl. Native RHCOL2

  winged sumac · Anacardiaceae 54 counties
• 
  Rhus glabra L. Native RHGL

  smooth sumac · Anacardiaceae 102 counties
• 
  Rhus typhina L. Native RHTY

  staghorn sumac · Anacardiaceae 27 counties
• 
  Rhynchosia latifolia Nutt. ex Torr. & A. Gray Native RHLA5

  prairie snoutbean · Fabaceae 1 county
• 
  Rhynchospora alba (L.) Vahl Native RHAL3

  white beaksedge · Cyperaceae 4 counties
• 
  Rhynchospora capillacea Torr. Native RHCA11

  needle beaksedge · Cyperaceae 7 counties
• 
  Rhynchospora capitellata (Michx.) Vahl Native RHCA12

  brownish beaksedge · Cyperaceae 10 counties
• 
  Rhynchospora corniculata (Lam.) A. Gray Native RHCO2

  shortbristle horned beaksedge · Cyperaceae 10 counties
• 
  Rhynchospora glomerata (L.) Vahl Native RHGL3

  clustered beaksedge · Cyperaceae 5 counties
• 
  Rhynchospora macrostachya Torr. ex A. Gray Native RHMA6

  tall horned beaksedge · Cyperaceae 2 counties
• 
  Rhynchospora recognita (Gale) Kral Native RHRE8

  globe beaksedge · Cyperaceae 3 counties
• 
  Ribes americanum Mill. Native RIAM2

  American black currant · Grossulariaceae 36 counties
• 
  Ribes aureum Pursh Native RIAU

  golden currant · Grossulariaceae 29 counties
• 
  Ribes aureum Pursh var. villosum DC. Native RIAUV

  golden currant · Grossulariaceae 29 counties
• 
  Ribes cynosbati L. Native RICY

  eastern prickly gooseberry · Grossulariaceae 37 counties
• 
  Ribes hirtellum Michx. Native RIHI

  hairystem gooseberry · Grossulariaceae 8 counties
• 
  Ribes missouriense Nutt. Native RIMI

  Missouri gooseberry · Grossulariaceae 78 counties
• 
  Ribes nigrum L. Introduced RINI

  European black currant · Grossulariaceae 1 county
• 
  Ribes rubrum L. Introduced RIRU80

  cultivated currant · Grossulariaceae 9 counties
• 
  Ricinus communis L. Introduced RICO3

  castorbean · Euphorbiaceae 2 counties
• 
  Robinia hispida L. Native ROHI

  bristly locust · Fabaceae 10 counties
• 
  Robinia hispida L. var. hispida Native ROHIH

  bristly locust · Fabaceae 10 counties
• 
  Robinia pseudoacacia L. Native ROPS

  black locust · Fabaceae 88 counties
• 
  Robinia viscosa Vent. Native ROVI

  clammy locust · Fabaceae 2 counties
• 
  Robinia viscosa Vent. var. viscosa Native ROVIV

  clammy locust · Fabaceae 2 counties
• 
  Rorippa curvipes Greene Native ROCU2

  bluntleaf yellowcress · Brassicaceae 3 counties
• 
  Rorippa curvipes Greene var. truncata (Jeps.) Rollins Native ROCUT

  bluntleaf yellowcress · Brassicaceae 3 counties
• 
  Rorippa palustris (L.) Besser Native ROPA2

  bog yellowcress · Brassicaceae 82 counties
• 
  Rorippa palustris (L.) Besser ssp. fernaldiana (Butters & Abbe) Jonsell Native ROPAF2

  Fernald's yellowcress · Brassicaceae 82 counties
• 
  Rorippa palustris (L.) Besser ssp. hispida (Desv.) Jonsell Native ROPAH

  hispid yellowcress · Brassicaceae 7 counties
• 
  Rorippa sessiliflora (Nutt.) Hitchc. Native ROSE

  stalkless yellowcress · Brassicaceae 75 counties
• 
  Rorippa sinuata (Nutt.) Hitchc. Native ROSI2

  spreading yellowcress · Brassicaceae 23 counties
• 
  Rorippa sylvestris (L.) Besser Introduced ROSY

  creeping yellowcress · Brassicaceae 55 counties
• 
  Rosa acicularis Lindl. Native ROAC

  prickly rose · Rosaceae 1 county
• 
  Rosa acicularis Lindl. ssp. sayi (Schwein.) W.H. Lewis Native ROACS

  prickly rose · Rosaceae 1 county
• 
  Rosa arkansana Porter Native ROAR3

  prairie rose · Rosaceae 34 counties
• 
  Rosa arkansana Porter var. arkansana Native ROARA

  prairie rose · Rosaceae 1 county
• 
  Rosa arkansana Porter var. suffulta (Greene) Cockerell Native ROARS

  prairie rose · Rosaceae 33 counties