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Stephanomeria parryi

Stephanomeria pauciflora

Stevia plummerae var. plummerae

Stigmaphyllon bannisterioides

Sterculia tragacantha

Sterculia

Sternbergia lutea

Lily-of-the-field

Stewartia malacodendron

Round-fruit stewartia

Stewartia ovata

Mountain stewartia

Sticherus bifidus

Mexican umbrella fern

Stigmaphyllon emarginatum

Monarch amazonvine

Stigmaphyllon tomentosum

Stillingia sylvatica subsp. sylvatica

Stipagrostis pennata subsp. pennata

Stipulicida lacerata

Streblus anthropophagorum

Streblus pendulinus

Streptanthus glandulosus ssp. secundus var. hoffmanii

Streptanthus glandulosus ssp. secundus var. secundus

Stipa lessingiana

Needle grass

Stipa tirsa