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4,639 species in Redwood National Park
Scleropodium colpophyllum
Scleropodium occidentale
Scytosiphon lomentaria
Sebastes nebulosus
Setophaga magnolia
Sidalcea elegans
Sparaxis tricolor
Sparganium emersum
Spergularia rubra
Sphaerophoria sulphuripes
Sphex ichneumoneus
Spiranthes porrifolia
Stemonitis splendens
Stercorarius maccormicki
Stereodon subimponens
Stereum ochraceoflavum
Streptanthus howellii
Strymon melinus
Sympetrum vicinum
Taphrina deformans
Terellia occidentalis
Tharsalea gorgon
Thaxterogaster oregonensis
Thysanocarpus curvipes
Torilis arvensis
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