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 1,651–1,700 of 3,901.

• 
  Halesia tetraptera Ellis Native HATE3

  mountain silverbell · Styracaceae 9 counties
• 
  Halesia tetraptera Ellis var. tetraptera Native HATET

  mountain silverbell · Styracaceae 9 counties
• 
  Hamamelis virginiana L. Native HAVI4

  American witchhazel · Hamamelidaceae 67 counties
• 
  Hamatocaulis vernicosus (Mitt.) Hedenäs Native HAVE70

  hamatocaulis moss · Amblystegiaceae 1 county
• 
  Hasteola suaveolens (L.) Pojark. Native HASU3

  false Indian plantain · Asteraceae 21 counties
• 
  Hedeoma hispida Pursh Native HEHI

  rough false pennyroyal · Lamiaceae 2 counties
• 
  Hedeoma pulegioides (L.) Pers. Native HEPU

  American false pennyroyal · Lamiaceae 62 counties
• 
  Hedera helix L. Introduced HEHE

  English ivy · Araliaceae 11 counties
• 
  Helenium amarum (Raf.) H. Rock Native HEAM

  sneezeweed · Asteraceae 3 counties
• 
  Helenium amarum (Raf.) H. Rock var. amarum Native HEAMA

  sneezeweed · Asteraceae 3 counties
• 
  Helenium autumnale L. Native HEAU

  common sneezeweed · Asteraceae 57 counties
• 
  Helenium autumnale L. var. autumnale Native HEAUA

  common sneezeweed · Asteraceae 57 counties
• 
  Helenium flexuosum Raf. Native HEFL

  purplehead sneezeweed · Asteraceae 31 counties
• 
  Helenium quadridentatum Labill. Native HEQU

  longdisk sneezeweed · Asteraceae 2 counties
• 
  Helianthemum bicknellii Fernald Native HEBI2

  hoary frostweed · Cistaceae 20 counties
• 
  Helianthemum canadense (L.) Michx. Native HECA3

  longbranch frostweed · Cistaceae 26 counties
• 
  Helianthemum propinquum E.P. Bicknell Native HEPR

  low frostweed · Cistaceae 15 counties
• 
  Helianthus angustifolius L. Native HEAN2

  swamp sunflower · Asteraceae 1 county
• 
  Helianthus annuus L. Native HEAN3

  common sunflower · Asteraceae 20 counties
• 
  Helianthus debilis Nutt. Native HEDE4

  cucumberleaf sunflower · Asteraceae 2 counties
• 
  Helianthus debilis Nutt. ssp. cucumerifolius (Torr. & A. Gray) Heiser Native HEDEC2

  cucumberleaf sunflower · Asteraceae 2 counties
• 
  Helianthus decapetalus L. Native HEDE

  thinleaf sunflower · Asteraceae 65 counties
• 
  Helianthus divaricatus L. Native HEDI2

  woodland sunflower · Asteraceae 60 counties
• 
  Helianthus giganteus L. Native HEGI

  giant sunflower · Asteraceae 39 counties
• 
  Helianthus grosseserratus M. Martens Native HEGR4

  sawtooth sunflower · Asteraceae 15 counties
• 
  Helianthus hirsutus Raf. Native HEHI2

  hairy sunflower · Asteraceae 6 counties
• 
  Helianthus maximiliani Schrad. Native HEMA2

  Maximilian sunflower · Asteraceae 3 counties
• 
  Helianthus microcephalus Torr. & A. Gray Native HEMI3

  small woodland sunflower · Asteraceae 17 counties
• 
  Helianthus mollis Lam. Native HEMO2

  ashy sunflower · Asteraceae 7 counties
• 
  Helianthus occidentalis Riddell Native HEOC2

  fewleaf sunflower · Asteraceae 1 county
• 
  Helianthus occidentalis Riddell ssp. occidentalis Native HEOCO

  fewleaf sunflower · Asteraceae 1 county
• 
  Helianthus petiolaris Nutt. Native HEPE

  prairie sunflower · Asteraceae 6 counties
• 
  Helianthus petiolaris Nutt. ssp. petiolaris Native HEPEP

  prairie sunflower · Asteraceae 6 counties
• 
  Helianthus strumosus L. Native HEST

  paleleaf woodland sunflower · Asteraceae 56 counties
• 
  Helianthus tuberosus L. Native HETU

  Jerusalem artichoke · Asteraceae 56 counties
• ⚘
  Helianthus ×laetiflorus Pers. (pro sp.) [pauciflorus × tuberosus] Native HELA

  cheerful sunflower · Asteraceae 20 counties
• 
  Heliopsis helianthoides (L.) Sweet Native HEHE5

  smooth oxeye · Asteraceae 60 counties
• 
  Heliopsis helianthoides (L.) Sweet var. helianthoides Native HEHEH

  smooth oxeye · Asteraceae 60 counties
• 
  Heliotropium amplexicaule Vahl Introduced HEAM4

  clasping heliotrope · Boraginaceae 1 county
• 
  Heliotropium curassavicum L. Native HECU3

  salt heliotrope · Boraginaceae 1 county
• 
  Heliotropium curassavicum L. var. curassavicum Native HECUC2

  salt heliotrope · Boraginaceae 1 county
• 
  Heliotropium europaeum L. Introduced HEEU

  European heliotrope · Boraginaceae 10 counties
• 
  Heliotropium ramosissimum (Lehm.) DC. Introduced HERA7

  wavy heliotrope · Boraginaceae 1 county
• 
  Heliotropium supinum L. Introduced HESU6

  dwarf heliotrope · Boraginaceae 1 county
• 
  Helleborus viridis L. Introduced HEVI

  green hellebore · Ranunculaceae 17 counties
• 
  Hemarthria altissima (Poir.) Stapf & C.E. Hubbard Introduced HEAL5

  limpograss · Poaceae 2 counties
• 
  Hemerocallis fulva (L.) L. Introduced HEFU

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

  yellow daylily · Liliaceae 13 counties
• 
  Hepatica nobilis Schreb. Native HENO2

  hepatica · Ranunculaceae 67 counties
• 
  Hepatica nobilis Schreb. var. acuta (Pursh) Steyerm. Native HENOA

  sharplobe hepatica · Ranunculaceae 39 counties