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 2,751–2,800 of 2,969 (native).

• 
  Tilia americana L. Native TIAM

  American basswood · Tiliaceae 94 counties
• 
  Tilia americana L. var. americana Native TIAMA

  American basswood · Tiliaceae 6 counties
• 
  Tilia americana L. var. heterophylla (Vent.) Loudon Native TIAMH

  American basswood · Tiliaceae 7 counties
• 
  Tipularia discolor (Pursh) Nutt. Native TIDI

  crippled cranefly · Orchidaceae 11 counties
• 
  Torreyochloa pallida (Torr.) Church Native TOPA6

  pale false mannagrass · Poaceae 3 counties
• 
  Torreyochloa pallida (Torr.) Church var. pallida Native TOPAP

  pale false mannagrass · Poaceae 3 counties
• 
  Toxicodendron pubescens Mill. Native TOPU2

  Atlantic poison oak · Anacardiaceae 2 counties
• 
  Toxicodendron radicans (L.) Kuntze Native TORA2

  eastern poison ivy · Anacardiaceae 102 counties
• 
  Toxicodendron radicans (L.) Kuntze ssp. negundo (Greene) Gillis Native TORAN

  eastern poison ivy · Anacardiaceae 2 counties
• 
  Toxicodendron radicans (L.) Kuntze ssp. radicans Native TORAR

  eastern poison ivy · Anacardiaceae 2 counties
• 
  Toxicodendron vernix (L.) Kuntze Native TOVE

  poison sumac · Anacardiaceae 8 counties
• 
  Trachelospermum difforme (Walter) A. Gray Native TRDI

  climbing dogbane · Apocynaceae 12 counties
• 
  Tradescantia bracteata Small Native TRBR

  longbract spiderwort · Commelinaceae 12 counties
• 
  Tradescantia ohiensis Raf. Native TROH

  bluejacket · Commelinaceae 94 counties
• 
  Tradescantia subaspera Ker Gawl. Native TRSU2

  zigzag spiderwort · Commelinaceae 50 counties
• 
  Tradescantia subaspera Ker Gawl. var. montana (Shuttlw. ex Britton) E.S. Anderson & Woodson Native TRSUM

  zigzag spiderwort · Commelinaceae 1 county
• 
  Tradescantia subaspera Ker Gawl. var. subaspera Native TRSUS

  zigzag spiderwort · Commelinaceae 48 counties
• 
  Tradescantia virginiana L. Native TRVI

  Virginia spiderwort · Commelinaceae 66 counties
• 
  Tragia cordata Michx. Native TRCO

  heartleaf noseburn · Euphorbiaceae 4 counties
• 
  Trautvetteria caroliniensis (Walter) Vail Native TRCA

  Carolina bugbane · Ranunculaceae 1 county
• 
  Trautvetteria caroliniensis (Walter) Vail var. caroliniensis Native TRCAC2

  Carolina bugbane · Ranunculaceae 1 county
• 
  Triadenum fraseri (Spach) Gleason Native TRFR

  Fraser's marsh St. Johnswort · Clusiaceae 13 counties
• 
  Triadenum tubulosum (Walter) Gleason Native TRTU

  lesser marsh St. Johnswort · Clusiaceae 9 counties
• 
  Triadenum virginicum (L.) Raf. Native TRVI2

  Virginia marsh St. Johnswort · Clusiaceae 2 counties
• 
  Triadenum walteri (J.G. Gmel.) Gleason Native TRWA

  greater marsh St. Johnswort · Clusiaceae 9 counties
• 
  Triantha glutinosa (Michx.) Baker Native TRGL5

  sticky tofieldia · Liliaceae 5 counties
• 
  Trichomanes boschianum Sturm Native TRBO

  Appalachian bristle fern · Hymenophyllaceae 3 counties
• 
  Trichophorum cespitosum (L.) Hartm. Native TRCE3

  tufted bulrush · Cyperaceae 2 counties
• 
  Trichophorum planifolium (Spreng.) Palla Native TRPL6

  bashful bulrush · Cyperaceae 2 counties
• 
  Trichostema brachiatum L. Native TRBR5

  fluxweed · Lamiaceae 59 counties
• 
  Trichostema dichotomum L. Native TRDI2

  forked bluecurls · Lamiaceae 18 counties
• 
  Tridens flavus (L.) Hitchc. Native TRFL2

  purpletop tridens · Poaceae 92 counties
• 
  Tridens flavus (L.) Hitchc. var. flavus Native TRFLF

  purpletop tridens · Poaceae 92 counties
• 
  Tridens strictus (Nutt.) Nash Native TRST2

  longspike tridens · Poaceae 6 counties
• 
  Trientalis borealis Raf. Native TRBO2

  starflower · Primulaceae 6 counties
• 
  Trientalis borealis Raf. ssp. borealis Native TRBOB

  starflower · Primulaceae 6 counties
• 
  Trifolium reflexum L. Native TRRE2

  buffalo clover · Fabaceae 20 counties
• 
  Triglochin maritima L. Native TRMA20

  seaside arrowgrass · Juncaginaceae 6 counties
• 
  Triglochin palustris L. Native TRPA28

  marsh arrowgrass · Juncaginaceae 9 counties
• 
  Trillium cernuum L. Native TRCE

  whip-poor-will flower · Liliaceae 2 counties
• 
  Trillium cuneatum Raf. Native TRCU

  little sweet Betsy · Liliaceae 1 county
• 
  Trillium erectum L. Native TRER3

  red trillium · Liliaceae 3 counties
• 
  Trillium flexipes Raf. Native TRFL6

  nodding wakerobin · Liliaceae 58 counties
• 
  Trillium grandiflorum (Michx.) Salisb. Native TRGR4

  white trillium · Liliaceae 19 counties
• 
  Trillium nivale Riddell Native TRNI2

  snow trillium · Liliaceae 31 counties
• 
  Trillium recurvatum Beck Native TRRE5

  bloody butcher · Liliaceae 102 counties
• 
  Trillium sessile L. Native TRSE2

  toadshade · Liliaceae 18 counties
• 
  Trillium viride Beck Native TRVI4

  wood wakerobin · Liliaceae 7 counties
• 
  Triodanis biflora (Ruiz & Pav.) Greene Native TRBI2

  small Venus' looking-glass · Campanulaceae 11 counties
• 
  Triodanis leptocarpa (Nutt.) Nieuwl. Native TRLE3

  slimpod Venus' looking-glass · Campanulaceae 6 counties