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 1,901–1,950 of 2,748 (native).

• 
  Polygonum amphibium L. Native POAM8

  water knotweed · Polygonaceae 47 counties
• 
  Polygonum amphibium L. var. emersum Michx. Native POAME

  longroot smartweed · Polygonaceae 47 counties
• 
  Polygonum amphibium L. var. stipulaceum Coleman Native POAMS

  water smartweed · Polygonaceae 8 counties
• 
  Polygonum arifolium L. Native POAR6

  halberdleaf tearthumb · Polygonaceae 49 counties
• 
  Polygonum buxiforme Small Native POBU2

  box knotweed · Polygonaceae 2 counties
• 
  Polygonum careyi Olney Native POCA8

  Carey's smartweed · Polygonaceae 9 counties
• 
  Polygonum cilinode Michx. Native POCI

  fringed black bindweed · Polygonaceae 45 counties
• 
  Polygonum erectum L. Native POER2

  erect knotweed · Polygonaceae 36 counties
• 
  Polygonum hydropiperoides Michx. Native POHY2

  swamp smartweed · Polygonaceae 41 counties
• 
  Polygonum lapathifolium L. Native POLA4

  curlytop knotweed · Polygonaceae 48 counties
• 
  Polygonum pensylvanicum L. Native POPE2

  Pennsylvania smartweed · Polygonaceae 64 counties
• 
  Polygonum punctatum Elliott Native POPU5

  dotted smartweed · Polygonaceae 62 counties
• 
  Polygonum punctatum Elliott var. confertiflorum (Meisn.) Fassett Native POPUC2

  dotted smartweed · Polygonaceae 61 counties
• 
  Polygonum punctatum Elliott var. punctatum Native POPUP4

  dotted smartweed · Polygonaceae 35 counties
• 
  Polygonum ramosissimum Michx. Native PORA3

  bushy knotweed · Polygonaceae 3 counties
• 
  Polygonum ramosissimum Michx. var. ramosissimum Native PORAR

  bushy knotweed · Polygonaceae 3 counties
• 
  Polygonum robustius (Small) Fernald Native PORO

  stout smartweed · Polygonaceae 6 counties
• 
  Polygonum sagittatum L. Native POSA5

  arrowleaf tearthumb · Polygonaceae 67 counties
• 
  Polygonum scandens L. var. cristatum (Engelm. & A. Gray) Gleason Native POSCC

  climbing false buckwheat · Polygonaceae 18 counties
• 
  Polygonum scandens L. var. scandens Native POSCS

  climbing false buckwheat · Polygonaceae 62 counties
• 
  Polygonum setaceum Baldw. Native POSE6

  bog smartweed · Polygonaceae 4 counties
• 
  Polygonum tenue Michx. Native POTE2

  pleatleaf knotweed · Polygonaceae 25 counties
• 
  Polygonum virginianum L. Native POVI2

  jumpseed · Polygonaceae 63 counties
• 
  Polymnia canadensis L. Native POCA11

  whiteflower leafcup · Asteraceae 15 counties
• 
  Polypodium virginianum L. Native POVI7

  rock polypody · Polypodiaceae 67 counties
• ⚘
  Polypodium ×incognitum Cusick [appalachianum × virginianum] Native POIN6

  Hybrid rock polypody · Polypodiaceae 45 counties
• 
  Polypremum procumbens L. Native POPR4

  juniper leaf · Buddlejaceae 1 county
• 
  Polystichum acrostichoides (Michx.) Schott Native POAC4

  Christmas fern · Dryopteridaceae 67 counties
• 
  Polystichum acrostichoides (Michx.) Schott var. acrostichoides Native POACA

  Christmas fern · Dryopteridaceae 67 counties
• 
  Polystichum braunii (Spenner) Fée Native POBR4

  Braun's hollyfern · Dryopteridaceae 4 counties
• 
  Pontederia cordata L. Native POCO14

  pickerelweed · Pontederiaceae 22 counties
• 
  Populus balsamifera L. Native POBA2

  balsam poplar · Salicaceae 19 counties
• 
  Populus balsamifera L. ssp. balsamifera Native POBAB2

  balsam poplar · Salicaceae 18 counties
• 
  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 tremuloides Michx. Native POTR5

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

  Carolina poplar · Salicaceae 10 counties
• ⚘
  Populus ×jackii Sarg. [balsamifera × deltoides] Native POJA2

  balm-of-Gilead · Salicaceae 34 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 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