Iowa

• Adair 19001
  393 taxa Open ↗
• Adams 19003
  200 taxa Open ↗
• Allamakee 19005
  118 taxa Open ↗
• Appanoose 19007
  38 taxa Open ↗
• Audubon 19009
  225 taxa Open ↗
• Benton 19011
  21 taxa Open ↗
• Black Hawk 19013
  33 taxa Open ↗
• Boone 19015
  146 taxa Open ↗
• Bremer 19017
  24 taxa Open ↗
• Buchanan 19019
  16 taxa Open ↗

Showing 2,051–2,100 of 2,225.

• 
  Thalictrum dasycarpum Fisch. & Avé-Lall. Native THDA

  purple meadow-rue · Ranunculaceae 29 counties
• 
  Thalictrum dioicum L. Native THDI

  early meadow-rue · Ranunculaceae 5 counties
• 
  Thalictrum revolutum DC. Native THRE

  waxyleaf meadow-rue · Ranunculaceae 2 counties
• 
  Thalictrum thalictroides (L.) Eames & B. Boivin Native THTH2

  rue anemone · Ranunculaceae 8 counties
• 
  Thaspium barbinode (Michx.) Nutt. Native THBA

  hairyjoint meadowparsnip · Apiaceae 16 counties
• 
  Thaspium trifoliatum (L.) A. Gray Native THTR

  purple meadowparsnip · Apiaceae 1 county
• 
  Thelypteris palustris Schott Native THPA

  eastern marsh fern · Thelypteridaceae 17 counties
• 
  Thelypteris palustris Schott var. pubescens (G. Lawson) Fernald Native THPAP

  eastern marsh fern · Thelypteridaceae 17 counties
• 
  Thinopyrum intermedium (Host) Barkworth & D.R. Dewey Introduced THIN6

  intermediate wheatgrass · Poaceae 1 county
• 
  Thinopyrum ponticum (Podp.) Z.-W. Liu & R.-C. Wang Introduced THPO7

  tall wheatgrass · Poaceae 3 counties
• 
  Thlaspi arvense L. Introduced THAR5

  field pennycress · Brassicaceae 15 counties
• 
  Thymus praecox Opiz Introduced THPR

  mother of thyme · Lamiaceae 1 county
• 
  Thymus praecox Opiz ssp. arcticus (Durand) Jalas Introduced THPRA

  creeping thyme · Lamiaceae 1 county
• 
  Tilia americana L. Native TIAM

  American basswood · Tiliaceae 23 counties
• 
  Tilia americana L. var. americana Native TIAMA

  American basswood · Tiliaceae 4 counties
• 
  Torilis arvensis (Huds.) Link Introduced TOAR

  spreading hedgeparsley · Apiaceae 2 counties
• 
  Torilis arvensis (Huds.) Link ssp. arvensis Introduced TOARA

  spreading hedgeparsley · Apiaceae 2 counties
• 
  Torilis japonica (Houtt.) DC. Introduced TOJA

  erect hedgeparsley · Apiaceae 1 county
• 
  Toxicodendron radicans (L.) Kuntze Native TORA2

  eastern poison ivy · Anacardiaceae 19 counties
• 
  Toxicodendron radicans (L.) Kuntze ssp. negundo (Greene) Gillis Native TORAN

  eastern poison ivy · Anacardiaceae 17 counties
• 
  Toxicodendron rydbergii (Small ex Rydb.) Greene Native TORY

  western poison ivy · Anacardiaceae 7 counties
• 
  Tradescantia bracteata Small Native TRBR

  longbract spiderwort · Commelinaceae 19 counties
• 
  Tradescantia ohiensis Raf. Native TROH

  bluejacket · Commelinaceae 18 counties
• 
  Tradescantia subaspera Ker Gawl. Native TRSU2

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

  zigzag spiderwort · Commelinaceae 1 county
• 
  Tragopogon dubius Scop. Introduced TRDU

  yellow salsify · Asteraceae 24 counties
• 
  Tragopogon porrifolius L. Introduced TRPO

  salsify · Asteraceae 4 counties
• 
  Tragopogon pratensis L. Introduced TRPR

  Jack-go-to-bed-at-noon · Asteraceae 2 counties
• 
  Triadenum fraseri (Spach) Gleason Native TRFR

  Fraser's marsh St. Johnswort · Clusiaceae 1 county
• 
  Tribulus terrestris L. Introduced TRTE

  puncturevine · Zygophyllaceae 6 counties
• 
  Trichostema brachiatum L. Native TRBR5

  fluxweed · Lamiaceae 5 counties
• 
  Tridens flavus (L.) Hitchc. Native TRFL2

  purpletop tridens · Poaceae 6 counties
• 
  Tridens flavus (L.) Hitchc. var. flavus Native TRFLF

  purpletop tridens · Poaceae 6 counties
• 
  Trifolium aureum Pollich Introduced TRAU2

  golden clover · Fabaceae 1 county
• 
  Trifolium campestre Schreb. Introduced TRCA5

  field clover · Fabaceae 2 counties
• 
  Trifolium dubium Sibth. Introduced TRDU2

  suckling clover · Fabaceae 1 county
• 
  Trifolium fragiferum L. Introduced TRFR2

  strawberry clover · Fabaceae 1 county
• 
  Trifolium hybridum L. Introduced TRHY

  alsike clover · Fabaceae 19 counties
• 
  Trifolium pratense L. Introduced TRPR2

  red clover · Fabaceae 26 counties
• 
  Trifolium reflexum L. Native TRRE2

  buffalo clover · Fabaceae 4 counties
• 
  Trifolium repens L. Introduced TRRE3

  white clover · Fabaceae 14 counties
• 
  Triglochin palustris L. Native TRPA28

  marsh arrowgrass · Juncaginaceae 1 county
• 
  Trillium cernuum L. Native TRCE

  whip-poor-will flower · Liliaceae 1 county
• 
  Trillium erectum L. Native TRER3

  red trillium · Liliaceae 1 county
• 
  Trillium flexipes Raf. Native TRFL6

  nodding wakerobin · Liliaceae 2 counties
• 
  Trillium grandiflorum (Michx.) Salisb. Native TRGR4

  white trillium · Liliaceae 2 counties
• 
  Trillium nivale Riddell Native TRNI2

  snow trillium · Liliaceae 5 counties
• 
  Trillium recurvatum Beck Native TRRE5

  bloody butcher · Liliaceae 2 counties
• 
  Triodanis perfoliata (L.) Nieuwl. Native TRPE4

  clasping Venus' looking-glass · Campanulaceae 15 counties
• 
  Triosteum aurantiacum E.P. Bicknell Native TRAU4

  orangefruit horse-gentian · Caprifoliaceae 3 counties