Arkansas

• Arkansas 05001
  816 taxa Open ↗
• Ashley 05003
  1,236 taxa Open ↗
• Baxter 05005
  1,025 taxa Open ↗
• Benton 05007
  1,372 taxa Open ↗
• Boone 05009
  697 taxa Open ↗
• Bradley 05011
  1,145 taxa Open ↗
• Calhoun 05013
  573 taxa Open ↗
• Carroll 05015
  1,039 taxa Open ↗
• Chicot 05017
  440 taxa Open ↗
• Clark 05019
  896 taxa Open ↗

Showing 451–500 of 562 (introduced).

• 
  Senna occidentalis (L.) Link Introduced SEOC2

  septicweed · Fabaceae 7 counties
• 
  Senna tora (L.) Roxb. Introduced SETO4

  sickle senna · Fabaceae 1 county
• 
  Sesbania punicea (Cav.) Benth. Introduced SEPU7

  rattlebox · Fabaceae 4 counties
• 
  Setaria faberi Herrm. Introduced SEFA

  Japanese bristlegrass · Poaceae 7 counties
• 
  Setaria italica (L.) P. Beauv. Introduced SEIT

  foxtail millet · Poaceae 1 county
• 
  Setaria pumila (Poir.) Roem. & Schult. Introduced SEPU8

  yellow foxtail · Poaceae 2 counties
• 
  Setaria pumila (Poir.) Roem. & Schult. ssp. pallidefusca (Schumach.) B.K. Simon Introduced SEPUP3

  cattail grass · Poaceae 1 county
• 
  Setaria pumila (Poir.) Roem. & Schult. ssp. pumila Introduced SEPUP2

  yellow foxtail · Poaceae 1 county
• 
  Setaria verticillata (L.) P. Beauv. Introduced SEVE3

  hooked bristlegrass · Poaceae 1 county
• 
  Setaria viridis (L.) P. Beauv. Introduced SEVI4

  green bristlegrass · Poaceae 26 counties
• 
  Setaria viridis (L.) P. Beauv. var. viridis Introduced SEVIV

  green bristlegrass · Poaceae 26 counties
• 
  Sherardia arvensis L. Introduced SHAR2

  blue fieldmadder · Rubiaceae 35 counties
• 
  Sideritis montana L. Introduced SIMO3

  mountain ironwort · Lamiaceae 1 county
• 
  Silene armeria L. Introduced SIAR

  sweet William silene · Caryophyllaceae 1 county
• 
  Silene latifolia Poir. Introduced SILA21

  bladder campion · Caryophyllaceae 2 counties
• 
  Silene latifolia Poir. ssp. alba (Mill.) Greuter & Burdet Introduced SILAA3

  bladder campion · Caryophyllaceae 2 counties
• 
  Silene vulgaris (Moench) Garcke Introduced SIVU

  maidenstears · Caryophyllaceae 2 counties
• 
  Silybum marianum (L.) Gaertn. Introduced SIMA3

  blessed milkthistle · Asteraceae 3 counties
• 
  Sinapis alba L. Introduced SIAL5

  white mustard · Brassicaceae 1 county
• 
  Sinapis arvensis L. Introduced SIAR4

  charlock mustard · Brassicaceae 14 counties
• 
  Sinapis arvensis L. ssp. arvensis Introduced SIARA

  wild mustard · Brassicaceae 14 counties
• 
  Sisymbrium altissimum L. Introduced SIAL2

  tall tumblemustard · Brassicaceae 4 counties
• 
  Sisymbrium officinale (L.) Scop. Introduced SIOF

  hedgemustard · Brassicaceae 24 counties
• 
  Solanum physalifolium Rusby Introduced SOPH

  hoe nightshade · Solanaceae 1 county
• 
  Solanum pseudocapsicum L. Introduced SOPS

  Jerusalem cherry · Solanaceae 1 county
• 
  Solanum sisymbriifolium Lam. Introduced SOSI

  sticky nightshade · Solanaceae 1 county
• 
  Solanum tuberosum L. Introduced SOTU

  Irish potato · Solanaceae 1 county
• 
  Soliva sessilis Ruiz & Pav. Introduced SOSE2

  field burrweed · Asteraceae 15 counties
• 
  Sonchus asper (L.) Hill Introduced SOAS

  spiny sowthistle · Asteraceae 42 counties
• 
  Sonchus oleraceus L. Introduced SOOL

  common sowthistle · Asteraceae 3 counties
• 
  Sorghum bicolor (L.) Moench Introduced SOBI2

  sorghum · Poaceae 1 county
• 
  Sorghum halepense (L.) Pers. Introduced SOHA

  Johnsongrass · Poaceae 52 counties
• 
  Spergula arvensis L. Introduced SPAR

  corn spurry · Caryophyllaceae 2 counties
• 
  Sphenoclea zeylanica Gaertn. Introduced SPZE

  chickenspike · Sphenocleaceae 23 counties
• 
  Spiraea cantoniensis Lour. Introduced SPCA10

  Reeves' meadowsweet · Rosaceae 2 counties
• 
  Spiraea prunifolia Siebold & Zucc. Introduced SPPR

  bridalwreath spirea · Rosaceae 2 counties
• 
  Spiraea thunbergii Siebold ex Blume Introduced SPTH2

  Thunberg's meadowsweet · Rosaceae 1 county
• ⚘
  Spiraea ×vanhouttei (Briot) Carrière [cantoniensis × trilobata] Introduced SPVA2

  spirea · Rosaceae 1 county
• 
  Sporobolus indicus (L.) R. Br. Introduced SPIN4

  smut grass · Poaceae 20 counties
• 
  Sporobolus indicus (L.) R. Br. var. indicus Introduced SPINI2

  smut grass · Poaceae 20 counties
• 
  Stellaria media (L.) Vill. Introduced STME2

  common chickweed · Caryophyllaceae 52 counties
• 
  Stellaria media (L.) Vill. ssp. media Introduced STMEM

  common chickweed · Caryophyllaceae 1 county
• 
  Symphytum officinale L. Introduced SYOF

  common comfrey · Boraginaceae 1 county
• 
  Tagetes erecta L. Introduced TAER

  Aztec marigold · Asteraceae 2 counties
• 
  Tamarix chinensis Lour. Introduced TACH2

  five-stamen tamarisk · Tamaricaceae 14 counties
• 
  Tamarix ramosissima Ledeb. Introduced TARA

  saltcedar · Tamaricaceae 1 county
• 
  Tanacetum vulgare L. Introduced TAVU

  common tansy · Asteraceae 3 counties
• 
  Taraxacum laevigatum (Willd.) DC. Introduced TALA2

  rock dandelion · Asteraceae 1 county
• 
  Taraxacum officinale F.H. Wigg. ssp. officinale Introduced TAOFO

  common dandelion · Asteraceae 51 counties
• 
  Thlaspi arvense L. Introduced THAR5

  field pennycress · Brassicaceae 15 counties