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 251–300 of 3,775.

• 
  Aristida dichotoma Michx. Native ARDI4

  churchmouse threeawn · Poaceae 47 counties
• 
  Aristida dichotoma Michx. var. curtissii A. Gray Native ARDIC

  Curtis' threeawn · Poaceae 19 counties
• 
  Aristida dichotoma Michx. var. dichotoma Native ARDID

  churchmouse threeawn · Poaceae 1 county
• 
  Aristida lanosa Muhl. ex Elliott Native ARLA6

  woollysheath threeawn · Poaceae 1 county
• 
  Aristida longespica Poir. Native ARLO16

  slimspike threeawn · Poaceae 54 counties
• 
  Aristida longespica Poir. var. geniculata (Raf.) Fernald Native ARLOG6

  slimspike threeawn · Poaceae 7 counties
• 
  Aristida longespica Poir. var. longespica Native ARLOL3

  slimspike threeawn · Poaceae 47 counties
• 
  Aristida oligantha Michx. Native AROL

  prairie threeawn · Poaceae 95 counties
• 
  Aristida purpurascens Poir. Native ARPU8

  arrowfeather threeawn · Poaceae 26 counties
• 
  Aristida purpurascens Poir. var. purpurascens Native ARPUP4

  arrowfeather threeawn · Poaceae 26 counties
• 
  Aristida purpurea Nutt. Native ARPU9

  purple threeawn · Poaceae 1 county
• 
  Aristida purpurea Nutt. var. nealleyi (Vasey) Allred Native ARPUN

  blue threeawn · Poaceae 1 county
• 
  Aristida ramosissima Engelm. ex A. Gray Native ARRA2

  s-curve threeawn · Poaceae 16 counties
• 
  Aristida tuberculosa Nutt. Native ARTU

  seaside threeawn · Poaceae 16 counties
• 
  Aristolochia serpentaria L. Native ARSE3

  Virginia snakeroot · Aristolochiaceae 47 counties
• 
  Aristolochia tomentosa Sims Native ARTO3

  woolly dutchman's pipe · Aristolochiaceae 12 counties
• 
  Armoracia rusticana G. Gaertn., B. Mey. & Scherb. Introduced ARRU4

  horseradish · Brassicaceae 38 counties
• 
  Arnoglossum atriplicifolium (L.) H. Rob. Native ARAT

  pale Indian plantain · Asteraceae 73 counties
• 
  Arnoglossum plantagineum Raf. Native ARPL4

  groovestem Indian plantain · Asteraceae 48 counties
• 
  Arnoglossum reniforme (Hook.) H. Rob. Native ARRE6

  great Indian plantain · Asteraceae 28 counties
• 
  Aronia melanocarpa (Michx.) Elliott Native ARME6

  black chokeberry · Rosaceae 13 counties
• ⚘
  Aronia ×prunifolia (Marshall) Rehder, (pro sp.) [arbutifolia × melanocarpa] Native ARPR2

  purple chokeberry · Rosaceae 6 counties
• 
  Arrhenatherum elatius (L.) P. Beauv. ex J. Presl & C. Presl Introduced AREL3

  tall oatgrass · Poaceae 18 counties
• 
  Arrhenatherum elatius (L.) P. Beauv. ex J. Presl & C. Presl var. elatius Introduced ARELE

  tall oatgrass · Poaceae 18 counties
• 
  Artemisia abrotanum L. Introduced ARAB2

  southernwood · Asteraceae 2 counties
• 
  Artemisia absinthium L. Introduced ARAB3

  absinthium · Asteraceae 11 counties
• 
  Artemisia annua L. Introduced ARAN3

  sweet sagewort · Asteraceae 50 counties
• 
  Artemisia biennis Willd. Both ARBI2

  biennial wormwood · Asteraceae 27 counties
• 
  Artemisia biennis Willd. var. biennis Introduced ARBIB

  biennial wormwood · Asteraceae 27 counties
• 
  Artemisia campestris L. Native ARCA12

  field sagewort · Asteraceae 31 counties
• 
  Artemisia campestris L. ssp. caudata (Michx.) H.M. Hall & Clem. Native ARCAC

  field sagewort · Asteraceae 31 counties
• 
  Artemisia dracunculus L. Native ARDR4

  tarragon · Asteraceae 10 counties
• 
  Artemisia frigida Willd. Native ARFR4

  prairie sagewort · Asteraceae 1 county
• 
  Artemisia ludoviciana Nutt. Both ARLU

  white sagebrush · Asteraceae 50 counties
• 
  Artemisia ludoviciana Nutt. ssp. ludoviciana Native ARLUL2

  white sagebrush · Asteraceae 50 counties
• 
  Artemisia pontica L. Introduced ARPO4

  Roman wormwood · Asteraceae 3 counties
• 
  Artemisia serrata Nutt. Native ARSE4

  sawtooth wormwood · Asteraceae 18 counties
• 
  Arum italicum Mill. Introduced ARIT

  Italian lords and ladies · Araceae 1 county
• 
  Aruncus dioicus (Walter) Fernald Both ARDI8

  bride's feathers · Rosaceae 54 counties
• 
  Aruncus dioicus (Walter) Fernald var. dioicus Native ARDID2

  bride's feathers · Rosaceae 1 county
• 
  Aruncus dioicus (Walter) Fernald var. pubescens (Rydb.) Fernald Native ARDIP

  bride's feathers · Rosaceae 3 counties
• 
  Arundinaria gigantea (Walter) Muhl. Native ARGI

  giant cane · Poaceae 28 counties
• 
  Arundo donax L. Introduced ARDO4

  giant reed · Poaceae 3 counties
• 
  Asarum canadense L. Native ASCA

  Canadian wildginger · Aristolochiaceae 84 counties
• 
  Asclepias amplexicaulis Sm. Native ASAM

  clasping milkweed · Asclepiadaceae 58 counties
• 
  Asclepias exaltata L. Native ASEX

  poke milkweed · Asclepiadaceae 47 counties
• 
  Asclepias hirtella (Pennell) Woodson Native ASHI

  green milkweed · Asclepiadaceae 69 counties
• 
  Asclepias incarnata L. Native ASIN

  swamp milkweed · Asclepiadaceae 99 counties
• 
  Asclepias incarnata L. ssp. incarnata Native ASINI

  swamp milkweed · Asclepiadaceae 99 counties
• 
  Asclepias lanuginosa Nutt. Native ASLA3

  sidecluster milkweed · Asclepiadaceae 10 counties