Hypericum pyramidatum Aiton. Section: Roscyna. American Great St. John's-wort. Phen: Jun-Aug. Hab: Swamps, bottomlands, wet meadows. Dist: QC west to MN, south to s. PA (Rhoads & Klein 1993; Rhoads & Block 2007), MD (Robson 2000; but excluded based on no specimen), and WV (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).
Synonymy ⓘ: = C, F, G, GrPl, Il, Pa; = Hypericum ascyron L. ssp. pyramidatum (Aiton) N.Robson – FNA6, K4, Mo2, NY, Robson (2006); < Hypericum ascyron L. – K1, K3, Mi, NE, Tat
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
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