Sparganium stoloniferum (Graebn.) Buch.-Ham. ex Juz. (Synonym : Sparganium erectum L. subsp. stoloniferum (Graebn.) H.Hara)

Family : Typhaceae

Sparganium subglobosum Morong

Family : Typhaceae

Spartina alterniflora Loisel. (Synonym : Spartina maritima Fernald var. alterniflora (Loisel.) St.-Yves)

Family : Poaceae [Naturalized plant]

Spartina anglica C.E.Hubb. (Synonym : Sporobolus anglicus (C.E.Hubb.) P.M.Peterson & Saarela)

Family : Poaceae [Naturalized plant]

Spergula arvensis L. (Synonym : Spergularia maxima (Weihe ex Boenn.) G.Don)

Family : Caryophyllaceae [Naturalized plant]

Spergularia bocconei (Scheele) Graebn. (Synonym : Alsine atheniensis (Asch.) Druce)

Family : Caryophyllaceae [Naturalized plant]

Spergularia marina (L.) Besser (Synonym : Spergula coreana H.Lév.)

Family : Caryophyllaceae

Spergularia rubra (L.) J.Presl & C.Presl (Synonym : Spergularia rubra (L.) J.Presl & C.Presl var. campestris A.Gray)

Family : Caryophyllaceae [Naturalized plant]

Sphagneticola calendulacea (L.) Pruski (Synonym : Wedelia calendulacea (L.) Less.)

Family : Asteraceae

Sphallerocarpus gracilis (Besser ex Trevir.) Koso-Pol. (Synonym : Chaerophyllum gracile Besser ex Trevir.)

Family : Apiaceae