Hypericum boreale
PlantsFamily: Hypericaceae · Genus: Hypericum

Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 2: 534. Courtesy of Kentucky Native Plant Society. Scanned by Omnitek Inc. · public_domain
About
Hypericum boreale, also known as northern St. John's-wort, is a short-lived perennial species of flowering plant in the family Hypericaceae, section Trigynobrathys.
Summary from Wikipedia
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Growing details and traits for Hypericum boreale in the Library.
No cultivars in the Library yet — the full profile above covers the species itself.