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 901–950 of 1,109 (introduced).

• 
  Scandix pecten-veneris L. Introduced SCPE

  shepherdsneedle · Apiaceae 1 county
• 
  Schedonorus arundinaceus (Schreb.) Dumort., nom. cons. Introduced SCAR7

  tall fescue · Poaceae 1 county
• 
  Schedonorus pratensis (Huds.) P. Beauv. Introduced SCPR4

  meadow fescue · Poaceae 65 counties
• 
  Scilla siberica Andrews Introduced SCSI2

  Siberian squill · Liliaceae 3 counties
• 
  Scleranthus annuus L. Introduced SCAN2

  German knotgrass · Caryophyllaceae 23 counties
• 
  Sclerochloa dura (L.) P. Beauv. Introduced SCDU2

  common hardgrass · Poaceae 1 county
• 
  Scolymus hispanicus L. Introduced SCHI

  common goldenthistle · Asteraceae 1 county
• 
  Scorpiurus muricatus L. Introduced SCMU3

  prickly scorpion's-tail · Fabaceae 1 county
• 
  Scrophularia umbrosa Dumort. Introduced SCUM

  water figwort · Scrophulariaceae 1 county
• 
  Secale cereale L. Introduced SECE

  cereal rye · Poaceae 23 counties
• 
  Securigera varia (L.) Lassen Introduced SEVA4

  crownvetch · Fabaceae 30 counties
• 
  Sedum acre L. Introduced SEAC

  goldmoss stonecrop · Crassulaceae 20 counties
• 
  Sedum album L. Introduced SEAL

  white stonecrop · Crassulaceae 5 counties
• 
  Sedum sarmentosum Bunge Introduced SESA

  stringy stonecrop · Crassulaceae 29 counties
• 
  Senecio erucifolius L. Introduced SEER5

  hoary ragwort · Asteraceae 1 county
• 
  Senecio jacobaea L. Introduced SEJA

  stinking willie · Asteraceae 2 counties
• 
  Senecio sylvaticus L. Introduced SESY

  woodland ragwort · Asteraceae 1 county
• 
  Senecio viscosus L. Introduced SEVI2

  sticky ragwort · Asteraceae 13 counties
• 
  Senecio vulgaris L. Introduced SEVU

  old-man-in-the-Spring · Asteraceae 27 counties
• 
  Setaria faberi Herrm. Introduced SEFA

  Japanese bristlegrass · Poaceae 45 counties
• 
  Setaria italica (L.) P. Beauv. Introduced SEIT

  foxtail millet · Poaceae 22 counties
• 
  Setaria pumila (Poir.) Roem. & Schult. Introduced SEPU8

  yellow foxtail · Poaceae 1 county
• 
  Setaria verticillata (L.) P. Beauv. Introduced SEVE3

  hooked bristlegrass · Poaceae 16 counties
• 
  Setaria verticilliformis Dunart. Introduced SEVE5

  barbed bristlegrass · Poaceae 1 county
• 
  Setaria viridis (L.) P. Beauv. Introduced SEVI4

  green bristlegrass · Poaceae 48 counties
• 
  Setaria viridis (L.) P. Beauv. var. major (Gaudin) Pospichal Introduced SEVIM

  green bristlegrass · Poaceae 14 counties
• 
  Setaria viridis (L.) P. Beauv. var. viridis Introduced SEVIV

  green bristlegrass · Poaceae 48 counties
• 
  Sherardia arvensis L. Introduced SHAR2

  blue fieldmadder · Rubiaceae 10 counties
• 
  Sida linifolia Cav. Introduced SILI6

  flaxleaf fanpetals · Malvaceae 1 county
• 
  Sideritis romana L. Introduced SIRO3

  simplebeak ironwort · Lamiaceae 1 county
• 
  Silene armeria L. Introduced SIAR

  sweet William silene · Caryophyllaceae 28 counties
• 
  Silene csereii Baumg. Introduced SICS

  Balkan catchfly · Caryophyllaceae 10 counties
• 
  Silene dichotoma Ehrh. Introduced SIDI2

  forked catchfly · Caryophyllaceae 23 counties
• 
  Silene dioica (L.) Clairville Introduced SIDI4

  red catchfly · Caryophyllaceae 5 counties
• 
  Silene gallica L. Introduced SIGA

  common catchfly · Caryophyllaceae 3 counties
• 
  Silene latifolia Poir. Introduced SILA21

  bladder campion · Caryophyllaceae 64 counties
• 
  Silene latifolia Poir. ssp. alba (Mill.) Greuter & Burdet Introduced SILAA3

  bladder campion · Caryophyllaceae 64 counties
• 
  Silene noctiflora L. Introduced SINO

  nightflowering silene · Caryophyllaceae 37 counties
• 
  Silene vulgaris (Moench) Garcke Introduced SIVU

  maidenstears · Caryophyllaceae 49 counties
• 
  Silybum marianum (L.) Gaertn. Introduced SIMA3

  blessed milkthistle · Asteraceae 2 counties
• 
  Sinapis alba L. Introduced SIAL5

  white mustard · Brassicaceae 12 counties
• 
  Sinapis arvensis L. Introduced SIAR4

  charlock mustard · Brassicaceae 52 counties
• 
  Sinapis arvensis L. ssp. arvensis Introduced SIARA

  wild mustard · Brassicaceae 52 counties
• 
  Sisymbrium altissimum L. Introduced SIAL2

  tall tumblemustard · Brassicaceae 39 counties
• 
  Sisymbrium irio L. Introduced SIIR

  London rocket · Brassicaceae 1 county
• 
  Sisymbrium loeselii L. Introduced SILO3

  small tumbleweed mustard · Brassicaceae 1 county
• 
  Sisymbrium officinale (L.) Scop. Introduced SIOF

  hedgemustard · Brassicaceae 56 counties
• 
  Solanum dulcamara L. Introduced SODU

  climbing nightshade · Solanaceae 64 counties
• 
  Solanum dulcamara L. var. dulcamara Introduced SODUD

  climbing nightshade · Solanaceae 64 counties
• 
  Solanum dulcamara L. var. villosissimum Desv. Introduced SODUV

  climbing nightshade · Solanaceae 2 counties