Lambstongue Ragwort
Senecio integerrimus
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Columbia Ragwort
Senecio integerrimus var. exaltatus
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Lambs-tongue Ragwort
Senecio integerrimus var. major
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Pale-yellow Ragwort
Senecio integerrimus var. ochroleucus
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Sierra Ragwort
Senecio scorzonella
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Tall Ragwort
Senecio serra
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Tall Ragwort
Senecio serra var. serra
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Arrowhead Butterweed
Senecio triangularis
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Bigpod Sesbania
Sesbania herbacea
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Western Sea-purslane
Sesuvium verrucosum
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Pt. Reyes Sidalcea
Sidalcea calycosa
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Vernal Pool Checkerbloom
Sidalcea calycosa ssp. calycosa
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Pt. Reyes Checkerbloom
Sidalcea calycosa ssp. rhizomata
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Hairy Checkerbloom
Sidalcea hirsuta
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Salt Spring Checkerbloom
Sidalcea neomexicana
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Oregon Checker Mallow
Sidalcea oregana
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Oregon Checkerbloom
Sidalcea oregana ssp. oregana
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Spicate Checker Mallow
Sidalcea oregana ssp. spicata
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Marsh Checkerbloom
Sidalcea ranunculacea
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Sierra Checkerbloom
Sidalcea reptans
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Scadden Flat Checkerbloom
Sidalcea stipularis
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Menzies' Catchfly
Silene menziesii
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Arroyo De La Cruz Blue Eyed Grass
Sisyrinchium bellum 'Arroyo De La Cruz'
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California Skies Blue Eyed Grass
Sisyrinchium bellum 'California Skies'
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Dwarf Blue Eyed Grass
Sisyrinchium bellum 'Dwarf'
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Fort Bragg Blue Eyed Grass
Sisyrinchium bellum 'Fort Bragg'
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H Bar H White Blue Eyed Grass
Sisyrinchium bellum 'H Bar H White'
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Merk's White Blue Eyed Grass
Sisyrinchium bellum 'Merk's White'
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Nanum Blue Eyed Grass
Sisyrinchium bellum 'Nanum'
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North Coast Blue-eyed Grass
Sisyrinchium bellum 'North Coast'
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Occidental Blue Eyed Grass
Sisyrinchium bellum 'Occidental'
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Rocky Point Blue Eyed Grass
Sisyrinchium bellum 'Rocky Point'
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San Simeon Blue Eyed Grass
Sisyrinchium bellum 'San Simeon'
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Sea Cliff Blue Eyed Grass
Sisyrinchium bellum 'Sea Cliff'
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Wayne's Dwarf Blue-eyed Grass
Sisyrinchium bellum 'Wayne's Dwarf'
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Wild Night Blue Eyed Grass
Sisyrinchium bellum 'Wild Night'
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Yellow Eyed Grass
Sisyrinchium californicum
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Elmer's Golden Eyed Grass
Sisyrinchium elmeri
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Nevada Blue-eyed-grass
Sisyrinchium halophilum
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Idaho Blue Eyed Grass
Sisyrinchium idahoense
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Idaho Blue-eyed Grass
Sisyrinchium idahoense var. occidentale
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Hemlock Waterparsnip
Sium suave
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Douglas' Nightshade
Solanum douglasii
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Southern Goldenrod
Solidago confinis
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Showy Goldenrod
Solidago spectabilis
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Narrowleaf Bur Reed
Sparganium angustifolium
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Emersed Bur Reed
Sparganium emersum
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Broadfruit Bur-reed
Sparganium eurycarpum
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Bur Reed
Sparganium eurycarpum var. eurycarpum
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Black Seed Sand-spurrey
Spergularia atrosperma
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Canadian Sandspurry
Spergularia canadensis
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Large Flowered Sand Spurry
Spergularia macrotheca
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Spergularia macrotheca var. leucantha
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Sticky Sandspurry
Spergularia macrotheca var. longistyla
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Saltmarsh Sand-spurrey
Spergularia marina
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Cinquefoil False Sagebrush
Sphaeromeria potentilloides
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Cinquefoil Tansy
Sphaeromeria potentilloides var. potentilloides
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Douglas's Spirea
Spiraea douglasii
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Irish Lady's-tresses
Spiranthes romanzoffiana
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Common Duckmeat
Spirodela polyrhiza