Triadenum walteri (J.F. Gmelin) Gleason. Walter’s Marsh St. John's-wort. Phen: Jul-Sep. Hab: Swamp forests and marshes. Dist: MD south to n. peninsular FL, west to e. TX, and north in the interior to s. MO, s. IL, and OH.

Origin/Endemic status: Endemic

Synonymy: = Ar, C, Fl2, FNA6, G, GW2, Il, K1, Mo2, NcTx, Pa, Tn, W, WH3, Adams (1973); = Hypericum petiolatum Walter – Tat; = Hypericum tubulosum Walter var. walteri (J.F.Gmel.) Lott – F, WV; = Hypericum walteri J.F.Gmel. – K3, K4, RAB, Tx, Va; = Triadenum petiolatum (Walter) Britton – S, S13

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: OBL (name change)
• Eastern Mountains and Piedmont: OBL (name change)
• Great Plains: OBL (name change)
• Midwest: OBL (name change)
• Northcentral & Northeast: OBL (name change)

Heliophily ?: 6