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2,976 species in Lassen Volcanic National Park
Salix exigua
Salix lucida
Salix prolixa
Saponaria officinalis
Sarcosphaera coronaria
Sarcotrochila balsameae
Scaeva affinis
Scaphinotus obliquus
Schistidium rivulare
Schoenoplectus americanus
Scleropodium obtusifolium
Scoliopteryx libatrix
Scutellaria nana
Scymnus coniferarum
Sericosema juturnaria
Serpula himantioides
Sicya macularia
Sidalcea glaucescens
Silene chalcedonica
Silene oregana
Silene verecunda
Sisyrinchium californicum
Sium suave
Slaterocoris longipennis
Smerinthus ophthalmica
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