Stellaria ruderalis M.Lepší, P.Lepší, Z.Kaplan & P.Koutecký

Family : Caryophyllaceae [Naturalized plant]

Stellera chamaejasme L. (Synonym : Passerina stelleri Wikstr.)

Family : Thymelaeaceae

Stephanandra incisa (Thunb.) Zabel (Synonym : Stephanandra flexuosa Siebold & Zucc.)

Family : Rosaceae

Stephanandra incisa (Thunb.) Zabel var. quadrifissa (Nakai) T.B.Lee (Synonym : Stephanandra quadrifissa Nakai)

Family : Rosaceae

Stephania japonica (Thunb.) Miers (Synonym : Menispermum japonicum Thunb.)

Family : Menispermaceae

Stewartia koreana Nakai ex Rehder (Synonym : Stewartia pseudocamellia Maxim. var. koreana (Nakai ex Rehder) Sealy)

Family : Theaceae

Stimpsonia chamaedrioides C.Wright ex A.Gray (Synonym : Primula veronicoides Petitm.)

Family : Primulaceae

Strelitzia reginae Banks

Family : Strelitziaceae

Streptolirion volubile Edgew. (Synonym : Streptolirion cordifolium (Griff.) Kuntze)

Family : Commelinaceae

Streptopus amplexifolius (L.) DC. (Synonym : Streptopus amplexifolius DC. var. papillatus Ohwi)

Family : Liliaceae