Polk County

Showing 801–850 of 971.

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  Scutellaria lateriflora L. var. lateriflora Native SCLAL2

  blue skullcap · Lamiaceae
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  Securigera varia (L.) Lassen Introduced SEVA4

  crownvetch · Fabaceae
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  Sedum oreganum Nutt. Native SEOR

  Oregon stonecrop · Crassulaceae
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  Senecio jacobaea L. Introduced SEJA

  stinking willie · Asteraceae
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  Senecio triangularis Hook. Native SETR

  arrowleaf ragwort · Asteraceae
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  Senecio vulgaris L. Introduced SEVU

  old-man-in-the-Spring · Asteraceae
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  Sericocarpus oregonensis Nutt. Native SEOR6

  Oregon whitetop aster · Asteraceae
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  Sericocarpus oregonensis Nutt. var. oregonensis Native SEORO2

  Oregon whitetop aster · Asteraceae
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  Setaria viridis (L.) P. Beauv. Introduced SEVI4

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

  green bristlegrass · Poaceae
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  Sherardia arvensis L. Introduced SHAR2

  blue fieldmadder · Rubiaceae
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  Sidalcea campestris Greene Native SICA2

  meadow checkerbloom · Malvaceae
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  Sidalcea malviflora (DC.) A. Gray ex Benth. Native SIMA2

  dwarf checkerbloom · Malvaceae
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  Sidalcea malviflora (DC.) A. Gray ex Benth. ssp. virgata (Howell) C.L. Hitchc. Native SIMAV

  dwarf checkerbloom · Malvaceae
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  Sidalcea nelsoniana Piper Native SINE2

  Nelson's checkerbloom · Malvaceae
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  Silene armeria L. Introduced SIAR

  sweet William silene · Caryophyllaceae
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  Silene hookeri Nutt. Native SIHO

  Hooker's silene · Caryophyllaceae
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  Silene hookeri Nutt. ssp. hookeri Native SIHOH

  Hooker's silene · Caryophyllaceae
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  Silybum marianum (L.) Gaertn. Introduced SIMA3

  blessed milkthistle · Asteraceae
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  Sinapis arvensis L. Introduced SIAR4

  charlock mustard · Brassicaceae
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  Sinapis arvensis L. ssp. arvensis Introduced SIARA

  wild mustard · Brassicaceae
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  Sisymbrium officinale (L.) Scop. Introduced SIOF

  hedgemustard · Brassicaceae
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  Sisyrinchium idahoense E.P. Bicknell Native SIID

  Idaho blue-eyed grass · Iridaceae
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  Sisyrinchium idahoense E.P. Bicknell var. idahoense Native SIIDI

  Idaho blue-eyed grass · Iridaceae
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  Solanum americanum Mill. Native SOAM

  American black nightshade · Solanaceae
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  Solanum dulcamara L. Introduced SODU

  climbing nightshade · Solanaceae
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  Solanum dulcamara L. var. dulcamara Introduced SODUD

  climbing nightshade · Solanaceae
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  Solanum physalifolium Rusby Introduced SOPH

  hoe nightshade · Solanaceae
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  Solidago canadensis L. Native SOCA6

  Canada goldenrod · Asteraceae
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  Solidago canadensis L. var. salebrosa (Piper) M.E. Jones Native SOCAS

  rough Canada goldenrod · Asteraceae
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  Sonchus asper (L.) Hill Introduced SOAS

  spiny sowthistle · Asteraceae
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  Sonchus oleraceus L. Introduced SOOL

  common sowthistle · Asteraceae
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  Sorbus sitchensis M. Roem. Native SOSI2

  western mountain ash · Rosaceae
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  Sorbus sitchensis M. Roem. var. grayi (Wenzig) C.L. Hitchc. Native SOSIG

  western mountain ash · Rosaceae
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  Sorghum bicolor (L.) Moench Introduced SOBI2

  sorghum · Poaceae
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  Sorghum bicolor (L.) Moench ssp. drummondii (Nees ex Steud.) de Wet & Harlan Introduced SOBID

  Sudangrass · Poaceae
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  Sparganium emersum Rehmann Native SPEM2

  European bur-reed · Sparganiaceae
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  Spergula arvensis L. Introduced SPAR

  corn spurry · Caryophyllaceae
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  Spergularia rubra (L.) J. Presl & C. Presl Introduced SPRU

  red sandspurry · Caryophyllaceae
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  Sphaerophysa salsula (Pall.) DC. Introduced SPSA3

  alkali swainsonpea · Fabaceae
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  Spiraea douglasii Hook. Native SPDO

  rose spirea · Rosaceae
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  Spiraea douglasii Hook. var. douglasii Native SPDOD

  rose spirea · Rosaceae
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  Spiranthes romanzoffiana Cham. Native SPRO

  hooded lady's tresses · Orchidaceae
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  Stachys chamissonis Benth. Native STCH

  coastal hedgenettle · Lamiaceae
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  Stachys chamissonis Benth. var. cooleyae (A. Heller) G. Mulligan & D. Munro Native STCHC3

  coastal hedgenettle · Lamiaceae
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  Stachys mexicana Benth. Native STME

  Mexican hedgenettle · Lamiaceae
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  Stachys rigida Nutt. ex Benth. Native STRI

  rough hedgenettle · Lamiaceae
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  Stellaria borealis Bigelow Native STBO3

  boreal starwort · Caryophyllaceae
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  Stellaria calycantha (Ledeb.) Bong. Native STCA

  northern starwort · Caryophyllaceae
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  Stellaria media (L.) Vill. Introduced STME2

  common chickweed · Caryophyllaceae