Hypericum prolificum

Hypericum prolificum, known as shrubby St. John's wort, is a deciduous shrub in the genus Hypericum. It was named for its "prolific" number of stamens.

Description
Hypericum prolificum is a shrub growing up to 2 m tall with elliptic to oblanceolate leaves up to 70 mm long and 15 mm broad. The flowerheads have between 1 and 9 flowers, each 15–30 mm across with 5 golden yellow petals and numerous stamens. The ovary is usually three-parted, though may have up to five parts in some individuals.

Distribution and habitat
Hypericum prolificum is native to the central and eastern United States and Ontario. Habitats include riparian areas, slopes, thickets, swamp edges, and oak woodlands.