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1,573 species in Crater Lake National Park
Sphagnum capillifolium
Sphagnum squarrosum
Sphagnum subsecundum
Sphex ichneumoneus
Sphinx perelegans
Sphyrapicus nuchalis
Spongiporus leucospongia
Stellaria longipes
Stereum sanguinolentum
Streptopus lanceolatus
Strobilurus albipilatus
Sweltsa exquisita
Symphoricarpos albus
Symphoricarpos mollis
Symphoricarpos rotundifolius
Sympistis poliochroa
Sympistis sandaraca
Synanthedon chrysidipennis
Syngrapha orophila
Taenionema kincaidi
Taphrina confusa
Taraxacum officinale
Taraxia tanacetifolia
Taxidea taxus
Taxus brevifolia
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