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 2,751–2,800 of 3,901.

• 
  Populus deltoides W. Bartram ex Marshall Native PODE3

  eastern cottonwood · Salicaceae 21 counties
• 
  Populus deltoides W. Bartram ex Marshall ssp. deltoides Native PODED

  eastern cottonwood · Salicaceae 1 county
• 
  Populus grandidentata Michx. Native POGR4

  bigtooth aspen · Salicaceae 67 counties
• 
  Populus nigra L. Introduced PONI

  Lombardy poplar · Salicaceae 5 counties
• 
  Populus tremuloides Michx. Native POTR5

  quaking aspen · Salicaceae 58 counties
• 
  Populus ×canadensis Moench (pro sp.) [deltoides × nigra] Native POCA19

  Carolina poplar · Salicaceae 10 counties
• ⚘
  Populus ×canescens (Aiton) Sm. (pro sp.) [alba × tremula] Introduced POCA14

  gray poplar · Salicaceae 7 counties
• ⚘
  Populus ×jackii Sarg. [balsamifera × deltoides] Native POJA2

  balm-of-Gilead · Salicaceae 34 counties
• 
  Portulaca grandiflora Hook. Introduced POGR7

  rose moss · Portulacaceae 10 counties
• 
  Portulaca oleracea L. Both POOL

  little hogweed · Portulacaceae 38 counties
• 
  Potamogeton alpinus Balbis Native POAL8

  alpine pondweed · Potamogetonaceae 4 counties
• 
  Potamogeton amplifolius Tuck. Native POAM5

  largeleaf pondweed · Potamogetonaceae 27 counties
• 
  Potamogeton bicupulatus Fernald Native POBI9

  snailseed pondweed · Potamogetonaceae 12 counties
• 
  Potamogeton confervoides Rchb. Native POCO12

  Tuckerman's pondweed · Potamogetonaceae 4 counties
• 
  Potamogeton crispus L. Introduced POCR3

  curly pondweed · Potamogetonaceae 38 counties
• 
  Potamogeton diversifolius Raf. Native PODI

  waterthread pondweed · Potamogetonaceae 37 counties
• 
  Potamogeton epihydrus Raf. Native POEP2

  ribbonleaf pondweed · Potamogetonaceae 53 counties
• 
  Potamogeton foliosus Raf. Native POFO3

  leafy pondweed · Potamogetonaceae 36 counties
• 
  Potamogeton foliosus Raf. ssp. foliosus Native POFOF4

  leafy pondweed · Potamogetonaceae 36 counties
• 
  Potamogeton friesii Rupr. Native POFR3

  Fries' pondweed · Potamogetonaceae 5 counties
• 
  Potamogeton gramineus L. Native POGR8

  variableleaf pondweed · Potamogetonaceae 8 counties
• 
  Potamogeton hillii Morong Native POHI4

  Hill's pondweed · Potamogetonaceae 6 counties
• 
  Potamogeton illinoensis Morong Native POIL

  Illinois pondweed · Potamogetonaceae 35 counties
• 
  Potamogeton natans L. Native PONA4

  floating pondweed · Potamogetonaceae 20 counties
• 
  Potamogeton nodosus Poir. Native PONO2

  longleaf pondweed · Potamogetonaceae 38 counties
• 
  Potamogeton oakesianus J.W. Robbins Native POOA

  Oakes' pondweed · Potamogetonaceae 15 counties
• 
  Potamogeton obtusifolius Mert. & W.D.J. Koch Native POOB2

  bluntleaf pondweed · Potamogetonaceae 1 county
• 
  Potamogeton perfoliatus L. Native POPE7

  claspingleaf pondweed · Potamogetonaceae 31 counties
• 
  Potamogeton praelongus Wulfen Native POPR5

  whitestem pondweed · Potamogetonaceae 2 counties
• 
  Potamogeton pulcher Tuck. Native POPU6

  spotted pondweed · Potamogetonaceae 3 counties
• 
  Potamogeton pusillus L. Native POPU7

  small pondweed · Potamogetonaceae 46 counties
• 
  Potamogeton richardsonii (Benn.) Rydb. Native PORI2

  Richardson's pondweed · Potamogetonaceae 1 county
• 
  Potamogeton robbinsii Oakes Native PORO2

  Robbins' pondweed · Potamogetonaceae 11 counties
• 
  Potamogeton spirillus Tuck. Native POSP3

  spiral pondweed · Potamogetonaceae 21 counties
• 
  Potamogeton strictifolius Benn. Native POST2

  narrowleaf pondweed · Potamogetonaceae 2 counties
• 
  Potamogeton tennesseensis Fernald Native POTE4

  Tennessee pondweed · Potamogetonaceae 4 counties
• 
  Potamogeton vaseyi J.W. Robbins Native POVA3

  Vasey's pondweed · Potamogetonaceae 8 counties
• 
  Potamogeton zosteriformis Fernald Native POZO

  flatstem pondweed · Potamogetonaceae 9 counties
• 
  Potentilla anglica Laicharding Introduced POAN7

  English cinquefoil · Rosaceae 1 county
• 
  Potentilla argentea L. Introduced POAR8

  silver cinquefoil · Rosaceae 27 counties
• 
  Potentilla argentea L. var. argentea Introduced POARA3

  silver cinquefoil · Rosaceae 27 counties
• 
  Potentilla arguta Pursh Native POAR7

  tall cinquefoil · Rosaceae 22 counties
• 
  Potentilla arguta Pursh ssp. arguta Native POARA4

  tall cinquefoil · Rosaceae 22 counties
• 
  Potentilla canadensis L. Native POCA17

  dwarf cinquefoil · Rosaceae 55 counties
• 
  Potentilla canadensis L. var. villosissima Fernald Native POCAV

  dwarf cinquefoil · Rosaceae 1 county
• 
  Potentilla intermedia L. Introduced POIN8

  downy cinquefoil · Rosaceae 8 counties
• 
  Potentilla norvegica L. Native PONO3

  Norwegian cinquefoil · Rosaceae 67 counties
• 
  Potentilla norvegica L. ssp. monspeliensis (L.) Asch. & Graebn. Native PONOM

  Norwegian cinquefoil · Rosaceae 67 counties
• ⚘
  Potentilla paradoxa Nutt. Native POPA15

  Paradox cinquefoil · Rosaceae 2 counties
• 
  Potentilla recta L. Introduced PORE5

  sulphur cinquefoil · Rosaceae 65 counties