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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

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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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image of plant© Nina Filippova, some rights reserved (CC BY), uploaded by Nina Filippova source CC-BY | Original Image ⭷
image of plant© Dmitrii Mostovoi, some rights reserved (CC BY), uploaded by Dmitrii Mostovoi source CC-BY | Original Image ⭷
image of plant© Valentin Kosterin, some rights reserved (CC BY), uploaded by Valentin Kosterin source CC-BY | Original Image ⭷
image of plant© Katie Kucera, some rights reserved (CC BY), uploaded by Katie Kucera source CC-BY | Original Image ⭷

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