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 1,451–1,500 of 2,969 (native).

• 
  Iris virginica L. var. shrevei (Small) E.S. Anderson Native IRVIS

  Shreve's iris · Iridaceae 85 counties
• 
  Isoetes engelmannii A. Braun Native ISEN

  Appalachian quillwort · Isoetaceae 1 county
• 
  Isoetes melanopoda Gay & Durieu ex Durieu Native ISME

  blackfoot quillwort · Isoetaceae 25 counties
• 
  Isolepis carinata Hook. & Arn. ex Torr. Native ISCA6

  keeled bulrush · Cyperaceae 7 counties
• 
  Isotria medeoloides (Pursh) Raf. Native ISME2

  small whorled pogonia · Orchidaceae 1 county
• 
  Isotria verticillata Raf. Native ISVE

  large whorled pogonia · Orchidaceae 1 county
• 
  Itea virginica L. Native ITVI

  Virginia sweetspire · Grossulariaceae 7 counties
• 
  Iva annua L. Native IVAN2

  annual marsh elder · Asteraceae 41 counties
• 
  Iva annua L. var. annua Native IVANA

  annual marsh elder · Asteraceae 2 counties
• 
  Jacquemontia tamnifolia (L.) Griseb. Native JATA

  hairy clustervine · Convolvulaceae 1 county
• 
  Jeffersonia diphylla (L.) Pers. Native JEDI

  twinleaf · Berberidaceae 22 counties
• 
  Juglans cinerea L. Native JUCI

  butternut · Juglandaceae 69 counties
• 
  Juglans nigra L. Native JUNI

  black walnut · Juglandaceae 101 counties
• 
  Juncus acuminatus Michx. Native JUAC

  tapertip rush · Juncaceae 65 counties
• 
  Juncus alpinoarticulatus Chaix Native JUAL4

  northern green rush · Juncaceae 4 counties
• 
  Juncus alpinoarticulatus Chaix ssp. nodulosus (Wahlenb.) Hämet-Ahti Native JUALN

  northern green rush · Juncaceae 4 counties
• 
  Juncus arcticus Willd. ssp. littoralis (Engelm.) Hultén Native JUARL

  mountain rush · Juncaceae 8 counties
• 
  Juncus articulatus L. Native JUAR4

  jointleaf rush · Juncaceae 1 county
• 
  Juncus biflorus Elliott Native JUBI

  bog rush · Juncaceae 47 counties
• 
  Juncus brachycarpus Engelm. Native JUBR

  whiteroot rush · Juncaceae 55 counties
• 
  Juncus brachycephalus (Engelm.) Buchenau Native JUBR2

  smallhead rush · Juncaceae 17 counties
• 
  Juncus brachyphyllus Wiegand Native JUBR3

  tuftedstem rush · Juncaceae 2 counties
• 
  Juncus bufonius L. Native JUBU

  toad rush · Juncaceae 22 counties
• 
  Juncus bufonius L. var. bufonius Native JUBUB

  toad rush · Juncaceae 22 counties
• 
  Juncus canadensis J. Gay ex Laharpe Native JUCA3

  Canadian rush · Juncaceae 25 counties
• 
  Juncus diffusissimus Buckley Native JUDI2

  slimpod rush · Juncaceae 8 counties
• 
  Juncus dudleyi Wiegand Native JUDU2

  Dudley's rush · Juncaceae 71 counties
• 
  Juncus effusus L. Native JUEF

  common rush · Juncaceae 41 counties
• 
  Juncus effusus L. var. pylaei (Laharpe) Fernald & Wiegand Native JUEFP2

  common rush · Juncaceae 1 county
• 
  Juncus effusus L. var. solutus Fernald & Wiegand Native JUEFS

  lamp rush · Juncaceae 41 counties
• 
  Juncus gerardii Loisel. Native JUGE

  saltmeadow rush · Juncaceae 1 county
• 
  Juncus gerardii Loisel. var. gerardii Native JUGEG

  saltmeadow rush · Juncaceae 1 county
• 
  Juncus greenei Oakes & Tuck. Native JUGR

  Greene's rush · Juncaceae 10 counties
• 
  Juncus interior Wiegand Native JUIN2

  inland rush · Juncaceae 90 counties
• 
  Juncus interior Wiegand var. interior Native JUINI

  inland rush · Juncaceae 90 counties
• 
  Juncus marginatus Rostk. Native JUMA4

  grassleaf rush · Juncaceae 31 counties
• 
  Juncus nodatus Coville Native JUNO

  stout rush · Juncaceae 29 counties
• 
  Juncus nodosus L. Native JUNO2

  knotted rush · Juncaceae 25 counties
• 
  Juncus nodosus L. var. nodosus Native JUNON

  knotted rush · Juncaceae 25 counties
• 
  Juncus pelocarpus E. Mey. Native JUPE

  brownfruit rush · Juncaceae 1 county
• 
  Juncus scirpoides Lam. Native JUSC

  needlepod rush · Juncaceae 5 counties
• 
  Juncus secundus P. Beauv. ex Poir. Native JUSE

  lopsided rush · Juncaceae 9 counties
• 
  Juncus tenuis Willd. Native JUTE

  poverty rush · Juncaceae 102 counties
• 
  Juncus torreyi Coville Native JUTO

  Torrey's rush · Juncaceae 83 counties
• 
  Juncus validus Coville Native JUVA2

  roundhead rush · Juncaceae 1 county
• 
  Juncus vaseyi Engelm. Native JUVA

  Vasey's rush · Juncaceae 3 counties
• 
  Juniperus communis L. Native JUCO6

  common juniper · Cupressaceae 2 counties
• 
  Juniperus communis L. var. depressa Pursh Native JUCOD

  common juniper · Cupressaceae 2 counties
• 
  Juniperus horizontalis Moench Native JUHO2

  creeping juniper · Cupressaceae 2 counties
• 
  Juniperus virginiana L. Native JUVI

  eastern redcedar · Cupressaceae 99 counties