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 451–500 of 1,109 (introduced).

• 
  Hemerocallis fulva (L.) L. Introduced HEFU

  orange daylily · Liliaceae 50 counties
• 
  Hemerocallis lilioasphodelus L. Introduced HELI4

  yellow daylily · Liliaceae 13 counties
• 
  Herniaria glabra L. Introduced HEGL8

  smooth rupturewort · Caryophyllaceae 1 county
• 
  Herniaria hirsuta L. Introduced HEHI7

  hairy rupturewort · Caryophyllaceae 1 county
• 
  Herniaria hirsuta L. ssp. cinerea (DC.) Coutinho Introduced HEHIC

  hairy rupturewort · Caryophyllaceae 1 county
• 
  Hesperis matronalis L. Introduced HEMA3

  dames rocket · Brassicaceae 61 counties
• 
  Hibiscus syriacus L. Introduced HISY

  rose of Sharon · Malvaceae 21 counties
• 
  Hibiscus trionum L. Introduced HITR

  flower of an hour · Malvaceae 36 counties
• 
  Hieracium aurantiacum L. Introduced HIAU

  orange hawkweed · Asteraceae 54 counties
• 
  Hieracium caespitosum Dumort. Introduced HICA10

  meadow hawkweed · Asteraceae 55 counties
• 
  Hieracium lachenalii C.C. Gmel. Introduced HILA8

  common hawkweed · Asteraceae 7 counties
• 
  Hieracium murorum L. Introduced HIMU

  wall hawkweed · Asteraceae 3 counties
• 
  Hieracium pilosella L. Introduced HIPI

  mouseear hawkweed · Asteraceae 15 counties
• 
  Hieracium pilosella L. var. pilosella Introduced HIPIP

  mouseear hawkweed · Asteraceae 15 counties
• 
  Hieracium piloselloides Vill. Introduced HIPI2

  tall hawkweed · Asteraceae 24 counties
• 
  Hieracium sabaudum L. Introduced HISA4

  New England hawkweed · Asteraceae 9 counties
• 
  Hieracium ×flagellare Willd. (pro sp.) [caespitosum × pilosella] Introduced HIFL2

  hawkweed · Asteraceae 11 counties
• 
  Hieracium ×flagellare Willd. var. flagellare Introduced HIFLF

  hawkweed · Asteraceae 11 counties
• 
  Hippocrepis comosa L. Introduced HICO3

  horseshoe vetch · Fabaceae 1 county
• 
  Holcus lanatus L. Introduced HOLA

  common velvetgrass · Poaceae 67 counties
• 
  Holcus mollis L. Introduced HOMO

  creeping velvetgrass · Poaceae 1 county
• 
  Holosteum umbellatum L. Introduced HOUM

  jagged chickweed · Caryophyllaceae 9 counties
• 
  Hordeum marinum Huds. Introduced HOMA2

  seaside barley · Poaceae 2 counties
• 
  Hordeum marinum Huds. ssp. gussoneanum (Parl.) Thell. Introduced HOMAG

  Mediterranean barley · Poaceae 2 counties
• 
  Hordeum murinum L. Introduced HOMU

  mouse barley · Poaceae 3 counties
• 
  Hordeum murinum L. ssp. leporinum (Link) Arcang. Introduced HOMUL

  hare barley · Poaceae 2 counties
• 
  Hordeum murinum L. ssp. murinum Introduced HOMUM

  wall barley · Poaceae 1 county
• 
  Hordeum vulgare L. Introduced HOVU

  common barley · Poaceae 19 counties
• 
  Hosta lancifolia (Thunb.) Engl. Introduced HOLA3

  narrowleaf plantain lily · Liliaceae 5 counties
• 
  Hosta plantaginea (Lam.) Asch. Introduced HOPL2

  fragrant plantain lily · Liliaceae 3 counties
• 
  Hosta ventricosa (Salisb.) Stearn Introduced HOVE

  blue plantain lily · Liliaceae 16 counties
• 
  Houttuynia cordata Thunb. Introduced HOCO3

  chameleon · Saururaceae 1 county
• 
  Humulus japonicus Siebold & Zucc. Introduced HUJA

  Japanese hop · Cannabaceae 20 counties
• 
  Hyacinthoides non-scripta (L.) Chouard ex Rothm. Introduced HYNO

  English bluebell · Liliaceae 3 counties
• 
  Hyacinthus orientalis L. Introduced HYOR

  garden hyacinth · Liliaceae 3 counties
• 
  Hydrangea paniculata Siebold Introduced HYPA

  panicled hydrangea · Hydrangeaceae 7 counties
• 
  Hydrocotyle sibthorpioides Lam. Introduced HYSI

  lawn marshpennywort · Apiaceae 7 counties
• 
  Hylotelephium erythrostictum (Miq.) H. Ohba Introduced HYER3

  garden stonecrop · Crassulaceae 9 counties
• 
  Hylotelephium spectabile (Boreau) H. Ohba Introduced HYSP9

  showy stonecrop · Crassulaceae 4 counties
• 
  Hylotelephium telephium (L.) H. Ohba Introduced HYTE10

  witch's moneybags · Crassulaceae 52 counties
• 
  Hylotelephium telephium (L.) H. Ohba ssp. telephium Introduced HYTET2

  witch's moneybags · Crassulaceae 52 counties
• 
  Hyoscyamus albus L. Introduced HYAL2

  white henbane · Solanaceae 1 county
• 
  Hyoscyamus niger L. Introduced HYNI

  black henbane · Solanaceae 2 counties
• 
  Hypericum perforatum L. Introduced HYPE

  common St. Johnswort · Clusiaceae 67 counties
• 
  Hypochaeris glabra L. Introduced HYGL2

  smooth cat's ear · Asteraceae 1 county
• 
  Hypochaeris radicata L. Introduced HYRA3

  hairy cat's ear · Asteraceae 34 counties
• 
  Hyssopus officinalis L. Introduced HYOF

  hyssop · Lamiaceae 2 counties
• 
  Iberis umbellata L. Introduced IBUM

  globe candytuft · Brassicaceae 5 counties
• 
  Impatiens balsamina L. Introduced IMBA

  spotted snapweed · Balsaminaceae 7 counties
• 
  Inula helenium L. Introduced INHE

  elecampane inula · Asteraceae 37 counties