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 351–400 of 3,901.

• 
  Aureolaria virginica (L.) Pennell Native AUVI

  downy yellow false foxglove · Scrophulariaceae 53 counties
• 
  Avena fatua L. Introduced AVFA

  wild oat · Poaceae 16 counties
• 
  Avena sativa L. Introduced AVSA

  common oat · Poaceae 26 counties
• 
  Baccharis halimifolia L. Native BAHA

  eastern baccharis · Asteraceae 7 counties
• 
  Ballota nigra L. Introduced BANI

  black horehound · Lamiaceae 1 county
• 
  Ballota nigra L. var. nigra Introduced BANIN

  black horehound · Lamiaceae 1 county
• 
  Baptisia australis (L.) R. Br. Native BAAU

  blue wild indigo · Fabaceae 11 counties
• 
  Baptisia australis (L.) R. Br. var. australis Native BAAUA

  blue wild indigo · Fabaceae 11 counties
• 
  Baptisia tinctoria (L.) R. Br. Native BATI

  horseflyweed · Fabaceae 57 counties
• 
  Barbarea verna (Mill.) Asch. Introduced BAVE

  early yellowrocket · Brassicaceae 25 counties
• 
  Barbarea vulgaris W.T. Aiton Introduced BAVU

  garden yellowrocket · Brassicaceae 66 counties
• 
  Bartonia paniculata (Michx.) Muhl. Native BAPA2

  twining screwstem · Gentianaceae 12 counties
• 
  Bartonia paniculata (Michx.) Muhl. ssp. paniculata Native BAPAP

  twining screwstem · Gentianaceae 12 counties
• 
  Bartonia virginica (L.) Britton, Sterns & Poggenb. Native BAVI3

  yellow screwstem · Gentianaceae 43 counties
• 
  Bassia hirsuta (L.) Asch. Introduced BAHI3

  hairy smotherweed · Chenopodiaceae 1 county
• 
  Bassia scoparia (L.) A.J. Scott Introduced BASC5

  burningbush · Chenopodiaceae 14 counties
• 
  Beckmannia syzigachne (Steud.) Fernald Native BESY

  American sloughgrass · Poaceae 1 county
• 
  Belamcanda chinensis (L.) DC. Introduced BECH

  blackberry lily · Iridaceae 18 counties
• 
  Bellis perennis L. Introduced BEPE2

  lawndaisy · Asteraceae 21 counties
• 
  Berberis canadensis Mill. Native BECA2

  American barberry · Berberidaceae 1 county
• 
  Berberis thunbergii DC. Introduced BETH

  Japanese barberry · Berberidaceae 51 counties
• 
  Berberis vulgaris L. Introduced BEVU

  common barberry · Berberidaceae 26 counties
• 
  Berteroa incana (L.) DC. Introduced BEIN2

  hoary alyssum · Brassicaceae 18 counties
• 
  Beta vulgaris L. Introduced BEVU2

  common beet · Chenopodiaceae 5 counties
• 
  Betula alleghaniensis Britton Native BEAL2

  yellow birch · Betulaceae 55 counties
• 
  Betula alleghaniensis Britton var. alleghaniensis Native BEALA

  yellow birch · Betulaceae 1 county
• 
  Betula lenta L. Native BELE

  sweet birch · Betulaceae 58 counties
• 
  Betula nigra L. Native BENI

  river birch · Betulaceae 39 counties
• 
  Betula papyrifera Marshall Native BEPA

  paper birch · Betulaceae 29 counties
• 
  Betula papyrifera Marshall var. papyrifera Native BEPAP

  paper birch · Betulaceae 1 county
• 
  Betula pendula Roth Introduced BEPE3

  European white birch · Betulaceae 6 counties
• 
  Betula populifolia Marshall Native BEPO

  gray birch · Betulaceae 32 counties
• 
  Betula pubescens Ehrh. Introduced BEPU5

  downy birch · Betulaceae 13 counties
• 
  Betula pubescens Ehrh. ssp. pubescens Introduced BEPUP5

  downy birch · Betulaceae 13 counties
• 
  Betula pumila L. Native BEPU4

  bog birch · Betulaceae 1 county
• 
  Betula pumila L. var. pumila Native BEPUP2

  bog birch · Betulaceae 1 county
• ⚘
  Betula ×caerulea Blanch. (pro sp.) [populifolia × papyrifera var. cordifolia] Native BECA4

  blue birch · Betulaceae 1 county
• ⚘
  Betula ×caerulea Blanch. var. caerulea Native BECAC

  blue birch · Betulaceae 1 county
• 
  Bidens alba (L.) DC. Native BIAL

  romerillo · Asteraceae 1 county
• 
  Bidens alba (L.) DC. var. radiata (Sch. Bip.) Ballard ex T.E. Melchert Native BIALR

  romerillo · Asteraceae 1 county
• 
  Bidens aristosa (Michx.) Britton Native BIAR

  bearded beggarticks · Asteraceae 25 counties
• 
  Bidens beckii Torr. ex Spreng. Native BIBE2

  Beck's water-marigold · Asteraceae 4 counties
• 
  Bidens bidentoides (Nutt.) Britton Native BIBI3

  Delmarva beggarticks · Asteraceae 3 counties
• 
  Bidens bipinnata L. Native BIBI7

  Spanish needles · Asteraceae 37 counties
• 
  Bidens cernua L. Native BICE

  nodding beggartick · Asteraceae 62 counties
• 
  Bidens connata Muhl. ex Willd. Native BICO5

  purplestem beggarticks · Asteraceae 44 counties
• 
  Bidens coronata (L.) Britton Native BICO

  crowned beggarticks · Asteraceae 14 counties
• 
  Bidens discoidea (Torr. & A. Gray) Britton Native BIDI

  small beggarticks · Asteraceae 11 counties
• 
  Bidens frondosa L. Native BIFR

  devil's beggartick · Asteraceae 66 counties
• 
  Bidens laevis (L.) Britton, Sterns & Poggenb. Native BILA

  smooth beggartick · Asteraceae 9 counties