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Silphium perfoliatum var. connatum

Silphium compositum

Silene verecunda

Anderson's campion

Silene hitchguirei

Silphium terebinthinaceum var. terebinthinaceum

Simarouba glauca

Sinapis alba subsp. dissecta

Solidago rugosa ssp. rugosa var. rugosa

Silphium terebinthinaceum

Basal-leaf rosinweed

Silphium radula

Roughleaf rosinweed

Silybum eburneum

Silver milk thistle

Silybum marianum

Variegated artichoke

Simmondsia chinensis

Goatnut

Sinapis arvensis

California-rape

Siphoneugena densiflora

Sisyrinchium campestre

Sisyrinchium dichotomum

Sisymbrium loeselii

London false rocket

Sisyrinchium californicum

Golden blue-eyed grass

Sisyrinchium chilense

Swordleaf blue-eyed grass