Triadenum virginicum (Linnaeus) Rafinesque. Common Marsh St. John's-wort. Phen: Jul-Sep. Hab: Bogs, fens, tidal swamps and marshes, other peaty wetlands. Dist: NS west to OH and s. ON, south to s. FL and MS, mostly on the Coastal Plain but scattered inland.

Origin/Endemic status: Native

Synonymy: = Ar, C, Fl2, FNA6, G, GW2, Il, K1, Mi, Pa, S, Tn, WH3; = Hypericum virginicum L. – K3, K4, NE, NY, RAB, Tx; = Hypericum virginicum L. var. virginicum – F, WV; < Triadenum virginicum (L.) Raf. – W, Adams (1973)

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