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 651–700 of 1,109 (introduced).

• 
  Mercurialis annua L. Introduced MEAN

  annual mercury · Euphorbiaceae 2 counties
• 
  Mesembryanthemum crystallinum L. Introduced MECR3

  common iceplant · Aizoaceae 1 county
• 
  Microstegium vimineum (Trin.) A. Camus Introduced MIVI

  Nepalese browntop · Poaceae 22 counties
• 
  Microthlaspi perfoliatum (L.) F.K. Mey. Introduced MIPE8

  claspleaf pennycress · Brassicaceae 10 counties
• 
  Mirabilis jalapa L. Introduced MIJA

  marvel of Peru · Nyctaginaceae 7 counties
• 
  Miscanthus sinensis Andersson Introduced MISI

  Chinese silvergrass · Poaceae 11 counties
• 
  Misopates orontium (L.) Raf. Introduced MIOR

  linearleaf snapdragon · Scrophulariaceae 2 counties
• 
  Moenchia erecta (L.) G. Gaertn., B. Mey. & Scherb. Introduced MOER

  upright chickweed · Caryophyllaceae 1 county
• 
  Molinia caerulea (L.) Moench Introduced MOCA2

  purple moorgrass · Poaceae 1 county
• 
  Mollugo cerviana (L.) Ser. Introduced MOCE

  threadstem carpetweed · Molluginaceae 1 county
• 
  Moluccella laevis L. Introduced MOLA

  shellflower · Lamiaceae 2 counties
• 
  Momordica charantia L. Introduced MOCH2

  balsampear · Cucurbitaceae 2 counties
• 
  Morus alba L. Introduced MOAL

  white mulberry · Moraceae 46 counties
• 
  Muscari botryoides (L.) Mill. Introduced MUBO

  common grape hyacinth · Liliaceae 28 counties
• 
  Muscari neglectum Guss. ex Ten. Introduced MUNE

  starch grape hyacinth · Liliaceae 4 counties
• 
  Myosotis arvensis (L.) Hill Introduced MYAR

  field forget-me-not · Boraginaceae 11 counties
• 
  Myosotis discolor Pers. Introduced MYDI

  changing forget-me-not · Boraginaceae 3 counties
• 
  Myosotis scorpioides L. Introduced MYSC

  true forget-me-not · Boraginaceae 53 counties
• 
  Myosotis stricta Link ex Roem. & Schult. Introduced MYST2

  strict forget-me-not · Boraginaceae 7 counties
• 
  Myosotis sylvatica Ehrh. Introduced MYSY

  woodland forget-me-not · Boraginaceae 3 counties
• 
  Myosoton aquaticum (L.) Moench Introduced MYAQ

  giantchickweed · Caryophyllaceae 39 counties
• 
  Myriophyllum aquaticum (Vell.) Verdc. Introduced MYAQ2

  parrot feather watermilfoil · Haloragaceae 6 counties
• 
  Myriophyllum spicatum L. Introduced MYSP2

  Eurasian watermilfoil · Haloragaceae 23 counties
• 
  Najas minor All. Introduced NAMI

  brittle waternymph · Najadaceae 11 counties
• 
  Narcissus poeticus L. Introduced NAPO

  poet's narcissus · Liliaceae 15 counties
• 
  Narcissus pseudonarcissus L. Introduced NAPS

  daffodil · Liliaceae 14 counties
• 
  Nasturtium microphyllum Boenn. ex Rchb. Introduced NAMI2

  onerow yellowcress · Brassicaceae 4 counties
• 
  Nasturtium officinale W.T. Aiton Introduced NAOF

  watercress · Brassicaceae 51 counties
• 
  Nepeta cataria L. Introduced NECA2

  catnip · Lamiaceae 65 counties
• 
  Neslia paniculata (L.) Desv. Introduced NEPA3

  ballmustard · Brassicaceae 1 county
• 
  Nicandra physalodes (L.) Scop. Introduced NIPH

  apple of Peru · Solanaceae 10 counties
• 
  Nicotiana alata Link & Otto Introduced NIAL

  jasmine tobacco · Solanaceae 1 county
• 
  Nicotiana longiflora Cav. Introduced NILO

  longflower tobacco · Solanaceae 2 counties
• 
  Nicotiana rustica L. Introduced NIRU

  Aztec tobacco · Solanaceae 1 county
• 
  Nicotiana tabacum L. Introduced NITA

  cultivated tobacco · Solanaceae 2 counties
• 
  Nigella damascena L. Introduced NIDA

  devil in the bush · Ranunculaceae 6 counties
• 
  Nonea rosea (M. Bieb.) Link Introduced NORO

  rose monkswort · Boraginaceae 1 county
• 
  Nonea vesicaria (L.) Rchb. Introduced NOVE

  red monkswort · Boraginaceae 1 county
• 
  Nymphoides peltata (S.G. Gmel.) Kuntze Introduced NYPE

  yellow floatingheart · Menyanthaceae 2 counties
• 
  Ocimum basilicum L. Introduced OCBA

  sweet basil · Lamiaceae 9 counties
• 
  Oenothera glazioviana Micheli Introduced OEGL

  redsepal evening primrose · Onagraceae 3 counties
• 
  Ononis spinosa L. Introduced ONSP

  spiny restharrow · Fabaceae 1 county
• 
  Onopordum acanthium L. Introduced ONAC

  Scotch cottonthistle · Asteraceae 5 counties
• 
  Origanum majorana L. Introduced ORMA

  sweet marjoram · Lamiaceae 2 counties
• 
  Origanum vulgare L. Introduced ORVU

  oregano · Lamiaceae 13 counties
• 
  Ornithogalum nutans L. Introduced ORNU

  drooping star of Bethlehem · Liliaceae 10 counties
• 
  Ornithogalum umbellatum L. Introduced ORUM

  star of Bethlehem · Liliaceae 40 counties
• 
  Ornithopus perpusillus L. Introduced ORPE80

  little white bird's-foot · Fabaceae 2 counties
• 
  Orobanche minor Sm. Introduced ORMI

  hellroot · Orobanchaceae 3 counties
• 
  Pachysandra terminalis Siebold & Zucc. Introduced PATE11

  Japanese pachysandra · Buxaceae 6 counties