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 3,451–3,500 of 3,901.

• 
  Sporobolus indicus (L.) R. Br. var. indicus Introduced SPINI2

  smut grass · Poaceae 1 county
• 
  Sporobolus neglectus Nash Native SPNE2

  puffsheath dropseed · Poaceae 19 counties
• 
  Sporobolus pyramidatus (Lam.) Hitchc. Native SPPY2

  Madagascar dropseed · Poaceae 1 county
• 
  Sporobolus vaginiflorus (Torr. ex A. Gray) Alph. Wood Native SPVA

  poverty dropseed · Poaceae 50 counties
• 
  Sporobolus vaginiflorus (Torr. ex A. Gray) Alph. Wood var. vaginiflorus Native SPVAV2

  poverty dropseed · Poaceae 50 counties
• 
  Stachys annua (L.) L. Introduced STAN

  annual hedgenettle · Lamiaceae 1 county
• 
  Stachys arvensis (L.) L. Introduced STAR

  staggerweed · Lamiaceae 1 county
• 
  Stachys aspera Michx. Native STAS

  hyssopleaf hedgenettle · Lamiaceae 2 counties
• 
  Stachys cordata Riddell Native STCO9

  heartleaf hedgenettle · Lamiaceae 2 counties
• 
  Stachys germanica L. Introduced STGE

  German hedgenettle · Lamiaceae 3 counties
• 
  Stachys hyssopifolia Michx. Native STHY3

  hyssopleaf hedgenettle · Lamiaceae 5 counties
• 
  Stachys palustris L. Native STPA

  marsh hedgenettle · Lamiaceae 24 counties
• 
  Stachys pilosa Nutt. Native STPI6

  hairy hedgenettle · Lamiaceae 1 county
• 
  Stachys pilosa Nutt. var. pilosa Native STPIP5

  hairy hedgenettle · Lamiaceae 1 county
• 
  Stachys sylvatica L. Introduced STSY2

  whitespot · Lamiaceae 1 county
• 
  Stachys tenuifolia Willd. Native STTE

  smooth hedgenettle · Lamiaceae 41 counties
• 
  Staphylea trifolia L. Native STTR

  American bladdernut · Staphyleaceae 51 counties
• 
  Stellaria alsine Grimm Native STAL4

  bog chickweed · Caryophyllaceae 40 counties
• 
  Stellaria borealis Bigelow Native STBO3

  boreal starwort · Caryophyllaceae 16 counties
• 
  Stellaria borealis Bigelow ssp. borealis Native STBOB

  boreal starwort · Caryophyllaceae 16 counties
• 
  Stellaria corei Shinners Native STCO7

  Tennessee starwort · Caryophyllaceae 8 counties
• 
  Stellaria graminea L. Introduced STGR

  grass-like starwort · Caryophyllaceae 54 counties
• 
  Stellaria holostea L. Introduced STHO2

  addersmeat · Caryophyllaceae 2 counties
• 
  Stellaria longifolia Muhl. ex Willd. Native STLO

  longleaf starwort · Caryophyllaceae 63 counties
• 
  Stellaria longifolia Muhl. ex Willd. var. longifolia Native STLOL

  longleaf starwort · Caryophyllaceae 63 counties
• 
  Stellaria media (L.) Vill. Introduced STME2

  common chickweed · Caryophyllaceae 63 counties
• 
  Stellaria pubera Michx. Native STPU

  star chickweed · Caryophyllaceae 23 counties
• 
  Stenanthium gramineum (Ker Gawl.) Morong Native STGR2

  eastern featherbells · Liliaceae 14 counties
• 
  Streptopus amplexifolius (L.) DC. Both STAM2

  claspleaf twistedstalk · Liliaceae 8 counties
• 
  Streptopus amplexifolius (L.) DC. var. amplexifolius Native STAMA2

  claspleaf twistedstalk · Liliaceae 8 counties
• 
  Streptopus lanceolatus (Aiton) Reveal Native STLA16

  twistedstalk · Liliaceae 36 counties
• 
  Streptopus lanceolatus (Aiton) Reveal var. lanceolatus Native STLAL2

  twistedstalk · Liliaceae 36 counties
• 
  Streptopus lanceolatus (Aiton) Reveal var. roseus (Michx.) Reveal Native STLAR

  twistedstalk · Liliaceae 6 counties
• 
  Strophostyles helvola (L.) Elliott Native STHE9

  amberique-bean · Fabaceae 18 counties
• 
  Strophostyles leiosperma (Torr. & A. Gray) Piper Native STLE6

  slickseed fuzzybean · Fabaceae 3 counties
• 
  Strophostyles umbellata (Muhl. ex Willd.) Britton Native STUM2

  pink fuzzybean · Fabaceae 7 counties
• 
  Stuckenia filiformis (Pers.) Börner Native STFI6

  fineleaf pondweed · Potamogetonaceae 5 counties
• 
  Stuckenia filiformis (Pers.) Börner ssp. alpina (Blytt) Haynes, D.H. Les & M. Kral Native STFIA2

  fineleaf pondweed · Potamogetonaceae 5 counties
• 
  Stuckenia pectinata (L.) Börner Native STPE15

  sago pondweed · Potamogetonaceae 22 counties
• 
  Stuckenia vaginata (Turcz.) Holub Native STVA8

  sheathed pondweed · Potamogetonaceae 1 county
• 
  Stylophorum diphyllum (Michx.) Nutt. Native STDI3

  celandine poppy · Papaveraceae 2 counties
• 
  Stylosanthes biflora (L.) Britton, Sterns & Poggenb. Native STBI2

  sidebeak pencilflower · Fabaceae 16 counties
• 
  Suaeda maritima (L.) Dumort. Both SUMA

  herbaceous seepweed · Chenopodiaceae 1 county
• 
  Suaeda maritima (L.) Dumort. ssp. maritima Introduced SUMAM

  herbaceous seepweed · Chenopodiaceae 1 county
• 
  Suaeda maritima (L.) Dumort. ssp. richii (Fernald) Bassett & C.W. Crompton Native SUMAR

  Rich's seepweed · Chenopodiaceae 1 county
• 
  Succisella inflexa (Kluk) G. Beck Introduced SUIN2

  southern succisella · Dipsacaceae 2 counties
• 
  Symphoricarpos albus (L.) S.F. Blake Native SYAL

  common snowberry · Caprifoliaceae 37 counties
• 
  Symphoricarpos albus (L.) S.F. Blake var. albus Native SYALA

  common snowberry · Caprifoliaceae 13 counties
• 
  Symphoricarpos albus (L.) S.F. Blake var. laevigatus (Fernald) S.F. Blake Native SYALL

  common snowberry · Caprifoliaceae 34 counties
• 
  Symphoricarpos occidentalis Hook. Native SYOC

  western snowberry · Caprifoliaceae 3 counties