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Stipagrostis obtusa

Stipagrostis pungens

Three-awn grass

Stokesia laevis

Stokes'-aster

Stipagrostis lanata

Streptanthus glandulosus ssp. secundus var. sonomensis

Streptanthus longisiliquus

Streptocarpus × hybridus

Streptopus fassettii

Streptopus lanceolatus var. lanceolatus

Streptopus streptopoides ssp. streptopoides var. brevipes

Sophora affinis

Strongylodon ruber

Strophanthus eminii

Streptopus lanceolatus

Twistedstalk

Striga gesnerioides

Tobacco witchweed

Strophanthus gratus

Climbing-oleander

Stylocline citroleum

Oil neststraw

Striga densiflora

Stuckenia filiformis subsp. alpinus

Stuckenia pectinatus