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 101–150 of 3,901.

• 
  Allium oleraceum L. Introduced ALOL

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

  cultivated garlic · Liliaceae 12 counties
• 
  Allium schoenoprasum L. Both ALSC

  wild chives · Liliaceae 6 counties
• 
  Allium schoenoprasum L. var. schoenoprasum Introduced ALSCS2

  wild chives · Liliaceae 6 counties
• 
  Allium tricoccum Aiton Native ALTR3

  ramp · Liliaceae 42 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
• 
  Alnus incana (L.) Moench Native ALIN2

  gray alder · Betulaceae 49 counties
• 
  Alnus incana (L.) Moench ssp. rugosa (Du Roi) R.T. Clausen Native ALINR

  speckled alder · Betulaceae 49 counties
• 
  Alnus serrulata (Aiton) Willd. Native ALSE2

  hazel alder · Betulaceae 59 counties
• 
  Alnus viridis (Chaix) DC. Native ALVI5

  green alder · Betulaceae 2 counties
• 
  Alnus viridis (Chaix) DC. ssp. crispa (Aiton) Turrill Native ALVIC

  mountain alder · Betulaceae 2 counties
• 
  Alopecurus aequalis Sobol. Native ALAE

  shortawn foxtail · Poaceae 11 counties
• 
  Alopecurus aequalis Sobol. var. aequalis Native ALAEA

  shortawn foxtail · Poaceae 11 counties
• 
  Alopecurus carolinianus Walter Native ALCA4

  Carolina foxtail · Poaceae 4 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
• 
  Alternanthera paronychioides A. St.-Hil. Both ALPA17

  smooth joyweed · Amaranthaceae 1 county
• 
  Alternanthera paronychioides A. St.-Hil. var. paronychioides Native ALPAP

  smooth joyweed · Amaranthaceae 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 arenicola I.M. Johnst. Native AMAR

  sandhill amaranth · Amaranthaceae 3 counties
• 
  Amaranthus blitum L. Introduced AMBL2

  purple amaranth · Amaranthaceae 11 counties
• 
  Amaranthus cannabinus (L.) Sauer Native AMCA2

  tidalmarsh amaranth · Amaranthaceae 3 counties
• 
  Amaranthus caudatus L. Introduced AMCA3

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

  red amaranth · Amaranthaceae 8 counties
• 
  Amaranthus deflexus L. Introduced AMDE

  largefruit amaranth · Amaranthaceae 2 counties
• 
  Amaranthus hybridus L. Native AMHY

  slim amaranth · Amaranthaceae 52 counties
• 
  Amaranthus palmeri S. Watson Native AMPA

  carelessweed · Amaranthaceae 4 counties
• 
  Amaranthus powellii S. Watson Native AMPO2

  Powell's amaranth · Amaranthaceae 37 counties
• 
  Amaranthus pumilus Raf. Native AMPU2

  seaside amaranth · Amaranthaceae 1 county
• 
  Amaranthus retroflexus L. Native AMRE

  redroot amaranth · Amaranthaceae 55 counties
• 
  Amaranthus spinosus L. Native AMSP

  spiny amaranth · Amaranthaceae 13 counties
• 
  Amaranthus tuberculatus (Moq.) Sauer Native AMTU

  roughfruit amaranth · Amaranthaceae 8 counties
• 
  Ambrosia artemisiifolia L. Both AMAR2

  annual ragweed · Asteraceae 67 counties
• 
  Ambrosia artemisiifolia L. var. elatior (L.) Descourtils Introduced AMARE

  annual ragweed · Asteraceae 1 county
• 
  Ambrosia psilostachya DC. Native AMPS

  Cuman ragweed · Asteraceae 1 county
• 
  Ambrosia trifida L. Native AMTR

  great ragweed · Asteraceae 61 counties
• 
  Ambrosia trifida L. var. trifida Native AMTRT2

  great ragweed · Asteraceae 61 counties
• 
  Amelanchier arborea (Michx. f.) Fernald Native AMAR3

  common serviceberry · Rosaceae 64 counties
• 
  Amelanchier arborea (Michx. f.) Fernald var. arborea Native AMARA4

  common serviceberry · Rosaceae 64 counties
• 
  Amelanchier bartramiana (Tausch) M. Roem. Native AMBA

  oblongfruit serviceberry · Rosaceae 3 counties
• 
  Amelanchier canadensis (L.) Medik. Native AMCA4

  Canadian serviceberry · Rosaceae 7 counties