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2,976 species in Lassen Volcanic National Park
Smithiastrum prenanthoides
Agrostis stolonifera
Spilosoma vestalis
Spirodela polyrhiza
Stellaria borealis
Stereum hirsutum
Sterna hirundo
Strymon melinus
Suillus granulatus
Susulus venustus
Symphoricarpos mollis
Ensatina eschscholtzii
Cercocarpus ledifolius
Symphyotrichum frondosum
Synaphaeta guexi
Syrphus opinator
Taphrina populi-salicis
Temnoscheila chlorodia
Tharsalea arota
Toxicoscordion venenosum
Tramea lacerata
Trichocnemis spiculatus
Typha latifolia
Uromyces junci-effusi
Xeris morrisoni
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