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 2,201–2,250 of 3,901.

• 
  Malaxis bayardii Fernald Native MABA6

  Bayard's adder's-mouth orchid · Orchidaceae 8 counties
• 
  Malaxis brachypoda (A. Gray) Fernald Native MABR5

  white adder's-mouth orchid · Orchidaceae 6 counties
• 
  Malaxis unifolia Michx. Native MAUN

  green adder's-mouth orchid · Orchidaceae 36 counties
• 
  Malus baccata (L.) Borkh. Introduced MABA

  Siberian crab apple · Rosaceae 6 counties
• 
  Malus coronaria (L.) Mill. Native MACO5

  sweet crab apple · Rosaceae 51 counties
• ⚘
  Malus floribunda Siebold ex Van Houtte Introduced MAFL80

  Japanese flowering crab apple · Rosaceae 3 counties
• 
  Malus prunifolia (Willd.) Borkh. Introduced MAPR

  plumleaf crab apple · Rosaceae 3 counties
• 
  Malus pumila Mill. Introduced MAPU

  paradise apple · Rosaceae 47 counties
• 
  Malus toringo (Siebold) Siebold ex de Vriese Introduced MATO6

  toringo crab · Rosaceae 1 county
• 
  Malva alcea L. Introduced MAAL

  vervain mallow · Malvaceae 2 counties
• 
  Malva moschata L. Introduced MAMO2

  musk mallow · Malvaceae 47 counties
• 
  Malva neglecta Wallr. Introduced MANE

  common mallow · Malvaceae 55 counties
• 
  Malva pusilla Sm. Introduced MAPU5

  low mallow · Malvaceae 3 counties
• 
  Malva sylvestris L. Introduced MASY

  high mallow · Malvaceae 17 counties
• 
  Malva verticillata L. Introduced MAVE

  cluster mallow · Malvaceae 3 counties
• 
  Malvastrum coromandelianum (L.) Garcke Introduced MACO6

  threelobe false mallow · Malvaceae 2 counties
• 
  Marrubium vulgare L. Introduced MAVU

  horehound · Lamiaceae 21 counties
• 
  Marshallia grandiflora Beadle & F.E. Boynt. Native MAGR7

  Monongahela Barbara's buttons · Asteraceae 1 county
• 
  Marsilea quadrifolia L. Introduced MAQU

  European waterclover · Marsileaceae 3 counties
• 
  Matelea obliqua (Jacq.) Woodson Native MAOB2

  climbing milkvine · Asclepiadaceae 13 counties
• 
  Matricaria discoidea DC. Introduced MADI6

  disc mayweed · Asteraceae 46 counties
• 
  Matricaria recutita L. Introduced MARE6

  German chamomile · Asteraceae 9 counties
• 
  Matteuccia struthiopteris (L.) Todaro Native MAST

  ostrich fern · Dryopteridaceae 49 counties
• 
  Mazus miquelii Makino Introduced MAMI4

  Miquel's mazus · Scrophulariaceae 6 counties
• 
  Mazus pumilus (Burm. f.) Steenis Introduced MAPU7

  Japanese mazus · Scrophulariaceae 6 counties
• 
  Medeola virginiana L. Native MEVI

  Indian cucumber · Liliaceae 67 counties
• 
  Medicago arabica (L.) Huds. Introduced MEAR

  spotted medick · Fabaceae 1 county
• 
  Medicago lupulina L. Introduced MELU

  black medick · Fabaceae 67 counties
• 
  Medicago polymorpha L. Introduced MEPO3

  burclover · Fabaceae 3 counties
• 
  Medicago sativa L. Introduced MESA

  alfalfa · Fabaceae 63 counties
• 
  Medicago sativa L. ssp. falcata (L.) Arcang. Introduced MESAF

  yellow alfalfa · Fabaceae 2 counties
• 
  Medicago sativa L. ssp. sativa Introduced MESAS

  alfalfa · Fabaceae 1 county
• 
  Meehania cordata (Nutt.) Britton Native MECO

  Meehan's mint · Lamiaceae 7 counties
• 
  Melampyrum lineare Desr. Native MELI2

  narrowleaf cowwheat · Scrophulariaceae 54 counties
• 
  Melampyrum lineare Desr. var. lineare Native MELIL3

  narrowleaf cowwheat · Scrophulariaceae 54 counties
• 
  Melampyrum lineare Desr. var. pectinatum (Pennell) Fernald Native MELIP2

  narrowleaf cowwheat · Scrophulariaceae 2 counties
• 
  Melica nitens (Scribn.) Nutt. ex Piper Native MENI

  threeflower melicgrass · Poaceae 8 counties
• 
  Melilotus altissimus Thuill. Introduced MEAL3

  tall yellow sweetclover · Fabaceae 3 counties
• 
  Melilotus officinalis (L.) Lam. Introduced MEOF

  sweetclover · Fabaceae 67 counties
• 
  Melilotus sulcatus Desf. Introduced MESU2

  Mediterranean sweetclover · Fabaceae 1 county
• 
  Melissa officinalis L. Introduced MEOF2

  common balm · Lamiaceae 22 counties
• 
  Menispermum canadense L. Native MECA3

  common moonseed · Menispermaceae 44 counties
• 
  Mentha aquatica L. Introduced MEAQ

  water mint · Lamiaceae 3 counties
• 
  Mentha arvensis L. Native MEAR4

  wild mint · Lamiaceae 64 counties
• 
  Mentha pulegium L. Introduced MEPU

  pennyroyal · Lamiaceae 2 counties
• 
  Mentha spicata L. Introduced MESP3

  spearmint · Lamiaceae 56 counties
• ⚘
  Mentha ×gracilis Sole (pro sp.) [arvensis × spicata] Introduced MEGR2

  gingermint · Lamiaceae 31 counties
• ⚘
  Mentha ×piperita L. (pro sp.) [aquatica × spicata] Native MEPI

  peppermint · Lamiaceae 58 counties
• ⚘
  Mentha ×rotundifolia (L.) Huds. (pro sp.) [longifolia × suaveolens] Introduced MERO2

  Lamiaceae 13 counties
• ⚘
  Mentha ×verticillata L., nom. inq. [aquatica × arvensis] Introduced MEVE2

  mint · Lamiaceae 5 counties