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 1–50 of 1,109 (introduced).

• 
  Abutilon theophrasti Medik. Introduced ABTH

  velvetleaf · Malvaceae 44 counties
• 
  Acanthospermum australe (Loefl.) Kuntze Introduced ACAU2

  Paraguayan starbur · Asteraceae 2 counties
• 
  Acer campestre L. Introduced ACCA5

  hedge maple · Aceraceae 11 counties
• 
  Acer ginnala Maxim. Introduced ACGI

  Amur maple · Aceraceae 8 counties
• 
  Acer palmatum Thunb. Introduced ACPA2

  Japanese maple · Aceraceae 8 counties
• 
  Acer platanoides L. Introduced ACPL

  Norway maple · Aceraceae 34 counties
• 
  Acer pseudoplatanus L. Introduced ACPS

  sycamore maple · Aceraceae 13 counties
• 
  Achillea ptarmica L. Introduced ACPT

  sneezeweed · Asteraceae 5 counties
• 
  Acinos arvensis (Lam.) Dandy Introduced ACAR2

  basil thyme · Lamiaceae 6 counties
• 
  Acorus calamus L. Introduced ACCA4

  calamus · Acoraceae 51 counties
• 
  Actaea spicata L. Introduced ACSP10

  Eurasian baneberry · Ranunculaceae 1 county
• 
  Aegilops cylindrica Host Introduced AECY

  jointed goatgrass · Poaceae 4 counties
• 
  Aegilops triuncialis L. Introduced AETR

  barbed goatgrass · Poaceae 1 county
• 
  Aegopodium podagraria L. Introduced AEPO

  bishop's goutweed · Apiaceae 24 counties
• 
  Aesculus hippocastanum L. Introduced AEHI

  horse chestnut · Hippocastanaceae 18 counties
• 
  Aethusa cynapium L. Introduced AECY2

  fool's parsley · Apiaceae 7 counties
• 
  Agrostemma githago L. Introduced AGGI

  common corncockle · Caryophyllaceae 42 counties
• 
  Agrostis capillaris L. Introduced AGCA5

  colonial bentgrass · Poaceae 27 counties
• 
  Agrostis gigantea Roth Introduced AGGI2

  redtop · Poaceae 67 counties
• 
  Agrostis stolonifera L. Introduced AGST2

  creeping bentgrass · Poaceae 33 counties
• 
  Ailanthus altissima (Mill.) Swingle Introduced AIAL

  tree of heaven · Simaroubaceae 37 counties
• 
  Aira caryophyllea L. Introduced AICA

  silver hairgrass · Poaceae 1 county
• 
  Aira caryophyllea L. var. caryophyllea Introduced AICAC2

  silver hairgrass · Poaceae 1 county
• 
  Aira praecox L. Introduced AIPR

  yellow hairgrass · Poaceae 3 counties
• 
  Ajuga genevensis L. Introduced AJGE

  blue bugle · Lamiaceae 3 counties
• 
  Ajuga reptans L. Introduced AJRE

  common bugle · Lamiaceae 19 counties
• 
  Akebia quinata (Houtt.) Decne. Introduced AKQU

  chocolate vine · Lardizabalaceae 7 counties
• 
  Albizia julibrissin Durazz. Introduced ALJU

  silktree · Fabaceae 4 counties
• 
  Alcea rosea L. Introduced ALRO3

  hollyhock · Malvaceae 23 counties
• 
  Alliaria petiolata (M. Bieb.) Cavara & Grande Introduced ALPE4

  garlic mustard · Brassicaceae 38 counties
• 
  Allium cepa L. Introduced ALCE

  garden onion · Liliaceae 7 counties
• 
  Allium oleraceum L. Introduced ALOL

  field garlic · Liliaceae 3 counties
• 
  Allium sativum L. Introduced ALSA2

  cultivated garlic · Liliaceae 12 counties
• 
  Allium schoenoprasum L. var. schoenoprasum Introduced ALSCS2

  wild chives · Liliaceae 6 counties
• 
  Allium vineale L. Introduced ALVI

  wild garlic · Liliaceae 42 counties
• 
  Allium vineale L. ssp. vineale Introduced ALVIV

  wild garlic · Liliaceae 42 counties
• 
  Alnus glutinosa (L.) Gaertn. Introduced ALGL2

  European alder · Betulaceae 8 counties
• ⚘
  Alopecurus creticus Trin. Introduced ALCR7

  Cretan meadow foxtail · Poaceae 1 county
• 
  Alopecurus geniculatus L. Introduced ALGE2

  water foxtail · Poaceae 1 county
• 
  Alopecurus geniculatus L. var. geniculatus Introduced ALGEG4

  water foxtail · Poaceae 1 county
• 
  Alopecurus myosuroides Huds. Introduced ALMY

  slender meadow foxtail · Poaceae 4 counties
• 
  Alopecurus pratensis L. Introduced ALPR3

  meadow foxtail · Poaceae 12 counties
• 
  Alopecurus rendlei Eig Introduced ALRE3

  Rendle's meadow foxtail · Poaceae 1 county
• 
  Althaea hirsuta L. Introduced ALHI2

  hairy marshmallow · Malvaceae 2 counties
• 
  Althaea officinalis L. Introduced ALOF2

  common marshmallow · Malvaceae 9 counties
• 
  Alyssum alyssoides (L.) L. Introduced ALAL3

  pale madwort · Brassicaceae 18 counties
• 
  Amaranthus albus L. Introduced AMAL

  prostrate pigweed · Amaranthaceae 50 counties
• 
  Amaranthus blitum L. Introduced AMBL2

  purple amaranth · Amaranthaceae 11 counties
• 
  Amaranthus caudatus L. Introduced AMCA3

  foxtail amaranth · Amaranthaceae 8 counties
• 
  Amaranthus cruentus L. Introduced AMCR4

  red amaranth · Amaranthaceae 8 counties