Flora of the Southeastern United States

Hypericum bartramium P. Miller. Common name: American Great St. John's-wort. Phenology: Jun-Aug. Habitat: Swamps, bottomlands, wet meadows. Distribution: Québec west to Minnesota, south to s. Pennsylvania (Rhoads & Klein 1993; Rhoads & Block 2007), Maryland (Robson 2000; but excluded based on no specimen), and West Virginia (Harmon, Ford-Werntz, & Grafton 2006).

Origin/Endemic status: Native

Taxonomy Comments: H. ascyron is east Asian; our eastern North American relative is variously treated as distinct at species rank (as done here), at subspecies rank, or merged with no recognition (see synonymy). H. bartramium P. Miller (1768) has priority at species rank over H. pyramidatum W. Aiton (1789).

Synonymy ⓘ: Hypericum ascyroides Willdenow; Hypericum ascyron L. var. americanum (Spach) Y. Kimura; Hypericum macrocarpum Michx.; = Hypericum ascyron L. ssp. pyramidatum (Aiton) N.Robson — Can, FNA6, K4, Mo2, NSProv, NY, POWO, Robson (2006); = Hypericum pyramidatum W. Aiton — C, F, G, GrPl, Il, Pa; = Roscyna americana Spach; < Hypericum ascyron L. — K1, Mi, NE, NS, Tat. Basionym: Hypericum bartramium P. Miller 1768

Links to other floras: = Hypericum ascyron ssp. pyramidatum - FNA6

Show in key(s)

Show parent genus | Show parent in key(s)

Wetland Indicator Status:

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

Heliophily ⓘ: 7