S

Salsify* [= Oyster plant] (Tragopogon porrifolius)
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Santa Susana tarweed (Hemizonia minthornii)
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Sawtooth goldenbush (Hazardia squarrosus)
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Scalebroom (Lepidospartum squamatum)
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Scarlet bugler (Penstemon centranthifolius)
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Scarlet larkspur (Delphinium cardinale)
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Scarlet monkeyflower (Mimulus cardinalis)
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Scarlet pimpernel* (Anagallis arvensis)
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Shooting stars (Dodecatheon clevelandii)
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Showy penstemon (Penstemon spectabilis)
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Shrubby butterweed [= Bush senecio] (Senecio flaccidus)
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Silver lotus (Lotus argophyllus)
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Silver puffs (Uropappus lindleyi)
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Skullcap (Scutellaria tuberosa)
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Slender cottonweed (Micropus californicus)
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Slender sunflower (Helianthus gracilentus)
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Slender tarweed (Hemizonia fasciculata)
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Snakeroot (Sanicula arguta)
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Snakeweed (Gutierrezia californica)
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Snowberry (Symphoricarpos mollis)
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Soap plant (Chlorogalum pomeridianum)
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Sourclover* (Melilotus indica)
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Southern California locoweed (Astragalus trichopodus)
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Southern honeysuckle (Lonicera subspicata)
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Southern tauschia (Tauschia arguta)
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Sow-thistle* (Sonchus oleraceus)
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Spanish broom (Spartium junceum)
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Spanish clover (Lotus purshianus)
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Speckled clarkia (Clarkia cylindrica)
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Speedwell* (Veronica anagallis-aquatica)
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Spring vetch* (Vicia sativa)
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Star lily (Zigadenus fremontii)
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Sticky cinquefoil (Potentilla glandulosa)
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Sticky madia [= Gumweed] (Madia gracilis)
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Stinging lupine (Lupinus hirsutissimus)
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Stinging nettle (Urtica dioica)
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Stinking gourd (Cucurbita foetidissima)
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Stream orchid (Epipactis gigantea)
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Strigose lotus (Lotus strigosus)
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Sugarbush (Rhus ovata)
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Suncups (Camissonia bistorta)
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Sweet fennel* (Foeniculum vulgare)
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