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 3,401–3,450 of 3,901.

• 
  Sparganium erectum L. Introduced SPER

  simplestem bur-reed · Sparganiaceae 1 county
• 
  Sparganium eurycarpum Engelm. Native SPEU

  broadfruit bur-reed · Sparganiaceae 37 counties
• 
  Sparganium fluctuans (Engelm. ex Morong) B.L. Rob. Native SPFL

  floating bur-reed · Sparganiaceae 4 counties
• 
  Sparganium natans L. Native SPNA

  small bur-reed · Sparganiaceae 3 counties
• 
  Spartina patens (Aiton) Muhl. Native SPPA

  saltmeadow cordgrass · Poaceae 1 county
• 
  Spartina pectinata Bosc ex Link Native SPPE

  prairie cordgrass · Poaceae 35 counties
• 
  Spergula arvensis L. Introduced SPAR

  corn spurry · Caryophyllaceae 23 counties
• 
  Spergularia maritima (All.) Chiov. Introduced SPMA10

  media sandspurry · Caryophyllaceae 1 county
• 
  Spergularia rubra (L.) J. Presl & C. Presl Introduced SPRU

  red sandspurry · Caryophyllaceae 14 counties
• 
  Spergularia salina J. Presl & C. Presl Native SPSA5

  salt sandspurry · Caryophyllaceae 1 county
• ⚘
  Sphagnum atlanticum R.E. Andrus Native SPAT3

  Atlantic sphagnum · Sphagnaceae 1 county
• 
  Sphenopholis intermedia (Rydb.) Rydb. Native SPIN3

  slender wedgescale · Poaceae 56 counties
• 
  Sphenopholis nitida (Biehler) Scribn. Native SPNI

  shiny wedgescale · Poaceae 52 counties
• 
  Sphenopholis obtusata (Michx.) Scribn. Native SPOB

  prairie wedgescale · Poaceae 17 counties
• 
  Sphenopholis pensylvanica (L.) Hitchc. Native SPPE3

  swamp wedgescale · Poaceae 27 counties
• ⚘
  Sphenopholis ×pallens (Biehler) Scribn. (pro sp.) [obtusata × pensylvanica] Native SPPA7

  wedgescale · Poaceae 12 counties
• 
  Spinacia oleracea L. Introduced SPOL

  spinach · Chenopodiaceae 1 county
• 
  Spiraea alba Du Roi Native SPAL2

  white meadowsweet · Rosaceae 62 counties
• 
  Spiraea alba Du Roi var. alba Native SPALA

  white meadowsweet · Rosaceae 1 county
• 
  Spiraea alba Du Roi var. latifolia (Aiton) Dippel Native SPALL

  white meadowsweet · Rosaceae 44 counties
• 
  Spiraea corymbosa Raf. Native SPCO12

  shinyleaf meadowsweet · Rosaceae 3 counties
• 
  Spiraea japonica L. f. Introduced SPJA

  Japanese meadowsweet · Rosaceae 15 counties
• 
  Spiraea japonica L. f. var. fortunei (Planch.) Rehder Introduced SPJAF

  fortune meadowsweet · Rosaceae 15 counties
• 
  Spiraea prunifolia Siebold & Zucc. Introduced SPPR

  bridalwreath spirea · Rosaceae 10 counties
• 
  Spiraea thunbergii Siebold ex Blume Introduced SPTH2

  Thunberg's meadowsweet · Rosaceae 1 county
• 
  Spiraea tomentosa L. Native SPTO2

  steeplebush · Rosaceae 44 counties
• 
  Spiraea virginiana Britton Native SPVI2

  Virginia meadowsweet · Rosaceae 1 county
• ⚘
  Spiraea ×billiardii Hérincq (pro sp.) [douglasii × salicifolia] Native SPBI2

  spirea · Rosaceae 12 counties
• ⚘
  Spiraea ×bumalda Burven [albiflora × japonica] Introduced SPBU2

  Japanese spiraea · Rosaceae 1 county
• 
  Spiranthes casei Catling & Cruise Native SPCA6

  Case's lady's tresses · Orchidaceae 4 counties
• 
  Spiranthes casei Catling & Cruise var. casei Native SPCAC4

  Case's lady's tresses · Orchidaceae 4 counties
• 
  Spiranthes cernua (L.) Rich. Native SPCE

  nodding lady's tresses · Orchidaceae 57 counties
• 
  Spiranthes lacera (Raf.) Raf. Native SPLA4

  northern slender lady's tresses · Orchidaceae 51 counties
• 
  Spiranthes lacera (Raf.) Raf. var. gracilis (Bigelow) Luer Native SPLAG

  northern slender lady's tresses · Orchidaceae 35 counties
• 
  Spiranthes lacera (Raf.) Raf. var. lacera Native SPLAL

  northern slender lady's tresses · Orchidaceae 31 counties
• 
  Spiranthes lucida (H.H. Eaton) Ames Native SPLU2

  shining lady's tresses · Orchidaceae 23 counties
• 
  Spiranthes magnicamporum Sheviak Native SPMA5

  Great Plains lady's tresses · Orchidaceae 2 counties
• 
  Spiranthes ochroleuca (Rydb.) Rydb. Native SPOC

  yellow nodding lady's tresses · Orchidaceae 57 counties
• 
  Spiranthes ovalis Lindl. Native SPOV

  October lady's tresses · Orchidaceae 1 county
• 
  Spiranthes ovalis Lindl. var. erostellata Catling Native SPOVE

  October lady's tresses · Orchidaceae 1 county
• 
  Spiranthes romanzoffiana Cham. Native SPRO

  hooded lady's tresses · Orchidaceae 2 counties
• 
  Spiranthes tuberosa Raf. Native SPTU

  little lady's tresses · Orchidaceae 7 counties
• 
  Spiranthes vernalis Engelm. & A. Gray Native SPVE

  spring lady's tresses · Orchidaceae 5 counties
• 
  Spirodela polyrrhiza (L.) Schleid. Native SPPO

  common duckmeat · Lemnaceae 39 counties
• 
  Sporobolus clandestinus (Biehler) Hitchc. Native SPCL

  rough dropseed · Poaceae 4 counties
• 
  Sporobolus compositus (Poir.) Merr. Native SPCO16

  composite dropseed · Poaceae 18 counties
• 
  Sporobolus compositus (Poir.) Merr. var. compositus Native SPCOC2

  composite dropseed · Poaceae 18 counties
• 
  Sporobolus cryptandrus (Torr.) A. Gray Native SPCR

  sand dropseed · Poaceae 7 counties
• 
  Sporobolus heterolepis (A. Gray) A. Gray Native SPHE

  prairie dropseed · Poaceae 2 counties
• 
  Sporobolus indicus (L.) R. Br. Introduced SPIN4

  smut grass · Poaceae 1 county