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 1,751–1,800 of 3,901.

• 
  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 pusillum Nutt. Native HOPU

  little barley · Poaceae 3 counties
• 
  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
• 
  Hottonia inflata Elliott Native HOIN

  American featherfoil · Primulaceae 2 counties
• 
  Houstonia caerulea L. Native HOCA4

  azure bluet · Rubiaceae 63 counties
• 
  Houstonia canadensis Willd. ex Roem. & Schult. Native HOCA5

  Canadian summer bluet · Rubiaceae 3 counties
• 
  Houstonia longifolia Gaertn. Native HOLO

  longleaf summer bluet · Rubiaceae 28 counties
• 
  Houstonia purpurea L. Native HOPU2

  Venus' pride · Rubiaceae 3 counties
• 
  Houstonia purpurea L. var. calycosa A. Gray Native HOPUC

  Venus' pride · Rubiaceae 1 county
• 
  Houstonia purpurea L. var. purpurea Native HOPUP3

  Venus' pride · Rubiaceae 2 counties
• 
  Houstonia serpyllifolia Michx. Native HOSE2

  thymeleaf bluet · Rubiaceae 1 county
• 
  Houttuynia cordata Thunb. Introduced HOCO3

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

  Japanese hop · Cannabaceae 20 counties
• 
  Humulus lupulus L. Both HULU

  common hop · Cannabaceae 43 counties
• 
  Huperzia lucidula (Michx.) Trevis. Native HULU2

  shining clubmoss · Lycopodiaceae 65 counties
• 
  Huperzia porophila (Lloyd & Underw.) Holub Native HUPO2

  rock clubmoss · Lycopodiaceae 2 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
• 
  Hybanthus concolor (T.F. Forst.) Spreng. Native HYCO6

  eastern greenviolet · Violaceae 29 counties
• 
  Hydrangea arborescens L. Native HYAR

  wild hydrangea · Hydrangeaceae 64 counties
• 
  Hydrangea paniculata Siebold Introduced HYPA

  panicled hydrangea · Hydrangeaceae 7 counties
• 
  Hydrastis canadensis L. Native HYCA

  goldenseal · Ranunculaceae 31 counties
• 
  Hydrocotyle americana L. Native HYAM

  American marshpennywort · Apiaceae 63 counties
• 
  Hydrocotyle ranunculoides L. f. Native HYRA

  floating marshpennywort · Apiaceae 8 counties
• 
  Hydrocotyle sibthorpioides Lam. Introduced HYSI

  lawn marshpennywort · Apiaceae 7 counties
• 
  Hydrocotyle umbellata L. Native HYUM

  manyflower marshpennywort · Apiaceae 3 counties
• 
  Hydrophyllum appendiculatum Michx. Native HYAP

  great waterleaf · Hydrophyllaceae 6 counties
• 
  Hydrophyllum canadense L. Native HYCA3

  bluntleaf waterleaf · Hydrophyllaceae 36 counties
• 
  Hydrophyllum macrophyllum Nutt. Native HYMA

  largeleaf waterleaf · Hydrophyllaceae 4 counties
• 
  Hydrophyllum virginianum L. Native HYVI

  eastern waterleaf · Hydrophyllaceae 60 counties
• 
  Hydrophyllum virginianum L. var. virginianum Native HYVIV

  eastern waterleaf · Hydrophyllaceae 60 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 telephioides (Michx.) H. Ohba Native HYTE9

  Allegheny stonecrop · Crassulaceae 2 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 adpressum W.P.C. Barton Native HYAD

  creeping St. Johnswort · Clusiaceae 1 county
• 
  Hypericum ascyron L. Native HYAS80

  great St. Johnswort · Clusiaceae 25 counties
• 
  Hypericum boreale (Britton) E.P. Bicknell Native HYBO2

  northern St. Johnswort · Clusiaceae 18 counties
• 
  Hypericum canadense L. Native HYCA7

  lesser Canadian St. Johnswort · Clusiaceae 28 counties
• 
  Hypericum crux-andreae (L.) Crantz Native HYCR3

  St. Peterswort · Clusiaceae 1 county
• 
  Hypericum densiflorum Pursh Native HYDE

  bushy St. Johnswort · Clusiaceae 5 counties
• 
  Hypericum denticulatum Walter Native HYDE2

  coppery St. Johnswort · Clusiaceae 2 counties
• ⚘
  Hypericum dissimulatum E.P. Bicknell Native HYDI2

  disguised St. Johnswort · Clusiaceae 11 counties