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3,863 species in Mount Rainier National Park
Rorippa curvisiliqua
Russula adusta
Sabulina rubella
Sarcomyxa serotina
Scapania uliginosa
Scytinium palmatum
Senecio vulgaris
Septoria epilobii
Silvius gigantulus
Sisymbrium officinale
Sonchus oleraceus
Soyedina producta
Sphaerobolus stellatus
Sphecomyia pattonii
Sporastatia testudinea
Stellaria media
Stereocaulon glareosum
Strymon melinus
Synanthedon bibionipennis
Syrphus ribesii
Tabanus sequax
Tachydromia tacoma
Tachygyna ursina
Taphrina occidentalis
Tetraphis pellucida
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