Pennsylvania

• Adams 42001
  1,101 taxa Open ↗
• Allegheny 42003
  1,943 taxa Open ↗
• Armstrong 42005
  1,126 taxa Open ↗
• Beaver 42007
  1,402 taxa Open ↗
• Bedford 42009
  1,989 taxa Open ↗
• Berks 42011
  2,115 taxa Open ↗
• Blair 42013
  1,613 taxa Open ↗
• Bradford 42015
  1,111 taxa Open ↗
• Bucks 42017
  2,298 taxa Open ↗
• Butler 42019
  1,422 taxa Open ↗

Showing 3,551–3,600 of 3,901.

• 
  Tagetes minuta L. Introduced TAMI3

  muster John Henry · Asteraceae 1 county
• 
  Tagetes patula L. Introduced TAPA

  French marigold · Asteraceae 6 counties
• 
  Tamarix parviflora DC. Introduced TAPA4

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

  costmary · Asteraceae 4 counties
• 
  Tanacetum parthenium (L.) Sch. Bip. Introduced TAPA6

  feverfew · Asteraceae 24 counties
• 
  Tanacetum vulgare L. Introduced TAVU

  common tansy · Asteraceae 46 counties
• 
  Taraxacum laevigatum (Willd.) DC. Introduced TALA2

  rock dandelion · Asteraceae 34 counties
• 
  Taraxacum officinale F.H. Wigg. Both TAOF

  common dandelion · Asteraceae 65 counties
• 
  Taraxacum officinale F.H. Wigg. ssp. officinale Introduced TAOFO

  common dandelion · Asteraceae 65 counties
• 
  Taxodium distichum (L.) Rich. Native TADI2

  bald cypress · Cupressaceae 3 counties
• 
  Taxus canadensis Marshall Native TACA7

  Canada yew · Taxaceae 57 counties
• 
  Teesdalia nudicaulis (L.) W.T. Aiton Introduced TENU

  barestem teesdalia · Brassicaceae 1 county
• 
  Tephrosia virginiana (L.) Pers. Native TEVI

  Virginia tephrosia · Fabaceae 45 counties
• 
  Tetragonia tetragonioides (Pall.) Kuntze Introduced TETE3

  New Zealand spinach · Aizoaceae 6 counties
• 
  Teucrium botrys L. Introduced TEBO

  cutleaf germander · Lamiaceae 1 county
• 
  Teucrium canadense L. Native TECA3

  Canada germander · Lamiaceae 63 counties
• 
  Teucrium canadense L. var. canadense Native TECAC

  Canada germander · Lamiaceae 63 counties
• 
  Teucrium canadense L. var. occidentale (A. Gray) E.M. McClint. & Epling Native TECAO

  western germander · Lamiaceae 5 counties
• 
  Thalictrum coriaceum (Britton) Small Native THCO2

  maid of the mist · Ranunculaceae 5 counties
• 
  Thalictrum dasycarpum Fisch. & Avé-Lall. Native THDA

  purple meadow-rue · Ranunculaceae 2 counties
• 
  Thalictrum dioicum L. Native THDI

  early meadow-rue · Ranunculaceae 61 counties
• 
  Thalictrum pubescens Pursh Native THPU2

  king of the meadow · Ranunculaceae 67 counties
• 
  Thalictrum revolutum DC. Native THRE

  waxyleaf meadow-rue · Ranunculaceae 44 counties
• 
  Thalictrum thalictroides (L.) Eames & B. Boivin Native THTH2

  rue anemone · Ranunculaceae 58 counties
• 
  Thaspium barbinode (Michx.) Nutt. Native THBA

  hairyjoint meadowparsnip · Apiaceae 46 counties
• 
  Thaspium trifoliatum (L.) A. Gray Native THTR

  purple meadowparsnip · Apiaceae 33 counties
• 
  Thaspium trifoliatum (L.) A. Gray var. aureum (L.) Britton Native THTRA

  purple meadowparsnip · Apiaceae 25 counties
• 
  Thaspium trifoliatum (L.) A. Gray var. trifoliatum Native THTRT

  purple meadowparsnip · Apiaceae 9 counties
• 
  Thelypteris noveboracensis (L.) Nieuwl. Native THNO

  New York fern · Thelypteridaceae 67 counties
• 
  Thelypteris palustris Schott Native THPA

  eastern marsh fern · Thelypteridaceae 65 counties
• 
  Thelypteris palustris Schott var. pubescens (G. Lawson) Fernald Native THPAP

  eastern marsh fern · Thelypteridaceae 65 counties
• 
  Thelypteris simulata (Davenport) Nieuwl. Native THSI2

  bog fern · Thelypteridaceae 13 counties
• 
  Thermopsis villosa (Walter) Fernald & B.G. Schub. Native THVI

  Aaron's rod · Fabaceae 1 county
• 
  Thinopyrum pycnanthum (Godr.) Barkworth Introduced THPY4

  tick quackgrass · Poaceae 1 county
• 
  Thlaspi alliaceum L. Introduced THAL2

  roadside pennycress · Brassicaceae 2 counties
• 
  Thlaspi arvense L. Introduced THAR5

  field pennycress · Brassicaceae 40 counties
• 
  Thuja occidentalis L. Native THOC2

  arborvitae · Cupressaceae 10 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
• 
  Thymus pulegioides L. Introduced THPU5

  lemon thyme · Lamiaceae 22 counties
• 
  Tiarella cordifolia L. Native TICO

  heartleaf foamflower · Saxifragaceae 51 counties
• 
  Tiarella cordifolia L. var. cordifolia Native TICOC2

  heartleaf foamflower · Saxifragaceae 51 counties
• 
  Tidestromia lanuginosa (Nutt.) Standl. Native TILA2

  woolly tidestromia · Amaranthaceae 1 county
• 
  Tilia americana L. Native TIAM

  American basswood · Tiliaceae 67 counties
• 
  Tilia americana L. var. americana Native TIAMA

  American basswood · Tiliaceae 63 counties
• 
  Tilia americana L. var. heterophylla (Vent.) Loudon Native TIAMH

  American basswood · Tiliaceae 41 counties
• 
  Tipularia discolor (Pursh) Nutt. Native TIDI

  crippled cranefly · Orchidaceae 5 counties
• 
  Torilis arvensis (Huds.) Link Introduced TOAR

  spreading hedgeparsley · Apiaceae 1 county
• 
  Torilis arvensis (Huds.) Link ssp. arvensis Introduced TOARA

  spreading hedgeparsley · Apiaceae 1 county
• 
  Torilis japonica (Houtt.) DC. Introduced TOJA

  erect hedgeparsley · Apiaceae 7 counties