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 3,451–3,500 of 3,775.

• 
  Symphytum officinale L. Introduced SYOF

  common comfrey · Boraginaceae 11 counties
• 
  Symplocarpus foetidus (L.) Salisb. ex W.P.C. Barton Native SYFO

  skunk cabbage · Araceae 26 counties
• 
  Synandra hispidula (Michx.) Britton Native SYHI

  Guyandotte beauty · Lamiaceae 2 counties
• 
  Syringa vulgaris L. Introduced SYVU

  common lilac · Oleaceae 8 counties
• 
  Taenidia integerrima (L.) Drude Native TAIN

  yellow pimpernel · Apiaceae 62 counties
• 
  Tamarix parviflora DC. Introduced TAPA4

  smallflower tamarisk · Tamaricaceae 3 counties
• 
  Tanacetum balsamita L. Introduced TABA

  costmary · Asteraceae 9 counties
• 
  Tanacetum parthenium (L.) Sch. Bip. Introduced TAPA6

  feverfew · Asteraceae 7 counties
• 
  Tanacetum vulgare L. Introduced TAVU

  common tansy · Asteraceae 50 counties
• 
  Taraxacum laevigatum (Willd.) DC. Introduced TALA2

  rock dandelion · Asteraceae 42 counties
• 
  Taraxacum officinale F.H. Wigg. Both TAOF

  common dandelion · Asteraceae 102 counties
• 
  Taraxacum officinale F.H. Wigg. ssp. officinale Introduced TAOFO

  common dandelion · Asteraceae 102 counties
• 
  Taxodium distichum (L.) Rich. Native TADI2

  bald cypress · Cupressaceae 17 counties
• 
  Taxus canadensis Marshall Native TACA7

  Canada yew · Taxaceae 8 counties
• 
  Tephrosia virginiana (L.) Pers. Native TEVI

  Virginia tephrosia · Fabaceae 59 counties
• 
  Tetraneuris herbacea Greene Native TEHE4

  eastern fournerved daisy · Asteraceae 2 counties
• 
  Teucrium canadense L. Native TECA3

  Canada germander · Lamiaceae 102 counties
• 
  Teucrium canadense L. var. canadense Native TECAC

  Canada germander · Lamiaceae 102 counties
• 
  Teucrium canadense L. var. occidentale (A. Gray) E.M. McClint. & Epling Native TECAO

  western germander · Lamiaceae 41 counties
• 
  Thalia dealbata Fraser ex Roscoe Native THDE

  powdery alligator-flag · Marantaceae 2 counties
• 
  Thalictrum dasycarpum Fisch. & Avé-Lall. Native THDA

  purple meadow-rue · Ranunculaceae 77 counties
• 
  Thalictrum dioicum L. Native THDI

  early meadow-rue · Ranunculaceae 54 counties
• 
  Thalictrum revolutum DC. Native THRE

  waxyleaf meadow-rue · Ranunculaceae 77 counties
• 
  Thalictrum thalictroides (L.) Eames & B. Boivin Native THTH2

  rue anemone · Ranunculaceae 68 counties
• 
  Thaspium barbinode (Michx.) Nutt. Native THBA

  hairyjoint meadowparsnip · Apiaceae 35 counties
• 
  Thaspium trifoliatum (L.) A. Gray Native THTR

  purple meadowparsnip · Apiaceae 67 counties
• 
  Thaspium trifoliatum (L.) A. Gray var. aureum (L.) Britton Native THTRA

  purple meadowparsnip · Apiaceae 2 counties
• 
  Thaspium trifoliatum (L.) A. Gray var. trifoliatum Native THTRT

  purple meadowparsnip · Apiaceae 1 county
• 
  Thelesperma megapotamicum (Spreng.) Kuntze Native THME

  Hopi tea greenthread · Asteraceae 1 county
• 
  Thelypteris noveboracensis (L.) Nieuwl. Native THNO

  New York fern · Thelypteridaceae 5 counties
• 
  Thelypteris palustris Schott Native THPA

  eastern marsh fern · Thelypteridaceae 44 counties
• 
  Thelypteris palustris Schott var. pubescens (G. Lawson) Fernald Native THPAP

  eastern marsh fern · Thelypteridaceae 44 counties
• 
  Thismia americana N.E. Pfeiffer Native THAM2

  banded Trinity · Burmanniaceae 1 county
• 
  Thlaspi alliaceum L. Introduced THAL2

  roadside pennycress · Brassicaceae 1 county
• 
  Thlaspi arvense L. Introduced THAR5

  field pennycress · Brassicaceae 76 counties
• 
  Thuja occidentalis L. Native THOC2

  arborvitae · Cupressaceae 5 counties
• 
  Thymelaea passerina (L.) Coss. & Germ. Introduced THPA7

  mezereon · Thymelaeaceae 2 counties
• 
  Thymus praecox Opiz Introduced THPR

  mother of thyme · Lamiaceae 2 counties
• 
  Thymus praecox Opiz ssp. arcticus (Durand) Jalas Introduced THPRA

  creeping thyme · Lamiaceae 2 counties
• 
  Tidestromia lanuginosa (Nutt.) Standl. Native TILA2

  woolly tidestromia · Amaranthaceae 1 county
• 
  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
• 
  Torilis arvensis (Huds.) Link Introduced TOAR

  spreading hedgeparsley · Apiaceae 52 counties
• 
  Torilis arvensis (Huds.) Link ssp. arvensis Introduced TOARA

  spreading hedgeparsley · Apiaceae 52 counties
• 
  Torilis japonica (Houtt.) DC. Introduced TOJA

  erect hedgeparsley · Apiaceae 57 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