Cinquefoil False Sagebrush
Sphaeromeria potentilloides
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Alkali Tansy-sage
Sphaeromeria potentilloides var. nitrophila
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Cinquefoil Tansy
Sphaeromeria potentilloides var. potentilloides
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Prairie Wedge Grass
Sphenopholis obtusata
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Douglas's Spirea
Spiraea douglasii
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Meadow Sweet
Spiraea splendens
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Creamy Lady's Tresses
Spiranthes porrifolia
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Irish Lady's-tresses
Spiranthes romanzoffiana
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Common Duckmeat
Spirodela polyrhiza
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Alkali Sacaton
Sporobolus airoides
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Spike Dropseed
Sporobolus contractus
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Sand Dropseed
Sporobolus cryptandrus
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Mesa Dropseed
Sporobolus flexuosus
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California Cord Grass
Sporobolus foliosus
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Alkali Cord Grass
Sporobolus hookerianus
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Big Sacaton
Sporobolus wrightii
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Ajuga Hedge Nettle
Stachys ajugoides
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White Hedge Nettle
Stachys albens
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Berg's Hedgenettle
Stachys bergii
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California Hedgenettle
Stachys bullata
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Rocky Point Hedge Nettle
Stachys bullata 'Rocky Point'
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Coastal Hedgenettle
Stachys chamissonis
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Mexican Hedgenettle
Stachys mexicana
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Marsh Hedgenettle
Stachys palustris
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Prairie Woundwort
Stachys pilosa
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Short Spike Hedge Nettle
Stachys pycnantha
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Rough Hedgenettle
Stachys rigida
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Rough Hedgenettle
Stachys rigida var. quercetorum
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Rigid Hedge Nettle
Stachys rigida var. rigida
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Stebbins' Hedgenettle
Stachys stebbinsii
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Sonoma Hedgenettle
Stachys stricta
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Panamint Princesplume
Stanleya elata
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Prince's Plume
Stanleya pinnata
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Desert Princesplume
Stanleya pinnata var. pinnata
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Green-flowered Prince's Plume
Stanleya viridiflora
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Sierra Bladdernut
Staphylea bolanderi
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Santa Cruz Microseris
Stebbinsoseris decipiens
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Grassland Silverpuffs
Stebbinsoseris heterocarpa
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Boreal Starwort
Stellaria borealis
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Sitka Starwort
Stellaria borealis ssp. sitchana
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Northern Starwort
Stellaria calycantha
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Crisp Starwort
Stellaria crispa
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Beach Starwort
Stellaria littoralis
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Long-leaved Starwort
Stellaria longifolia
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Longstalk Starwort
Stellaria longipes
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Goldie's Starwort
Stellaria longipes ssp. longipes
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Shining Chickweed
Stellaria nitens
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Umbellate Starwort
Stellaria umbellata
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Purple Stemodia
Stemodia durantifolia
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Western Featherbells
Stenanthium occidentale
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Stemless Mock Goldenweed
Stenotus acaulis
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Woolly Mock Goldenweed
Stenotus lanuginosus
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Woolly Stenotus
Stenotus lanuginosus var. lanuginosus
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Chicory Leaved Stephanomeria
Stephanomeria cichoriacea
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San Diego Wirelettuce
Stephanomeria diegensis
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Santa Barbara Wirelettuce
Stephanomeria elata
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Small Wirelettuce
Stephanomeria exigua
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Whiteplume Wirelettuce
Stephanomeria exigua ssp. carotifera
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Whiteplume Wirelettuce
Stephanomeria exigua ssp. coronaria
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Deane's Wirelettuce
Stephanomeria exigua ssp. deanei