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Northeast Wetland Flora

Field Office Guide to Plant Species

Coppery St. John's-wort
Hypericum denticulatum Walter

JPG -- Species Photo JPG -- Distribution Map

Family: St. John's-wort (Guttiferae)
Flowering: June-September
Field Marks: This herb differs by having more than 20 stamens, 3 styles free to the base, and smooth leaves and stems.
Habitat: Moist woods, swamps, wet ditches, pine barrens.
Habit: Perennial herb with fibrous roots.
Stems: Upright, branched or unbranched, smooth, 4-angled, up to nearly 2 feet tall.
Leaves: Opposite, simple, spreading to ascending, elliptic to narrowly ovate, rounded or pointed at the tip, rounded or tapering to the sessile base, smooth, sometimes dotted, up to 1 inch long, up to 3/4 inch wide.
Flowers: Few to several in racemes, the racemes on strongly ascending stalks, the flowers yellow, about 1/2 inch across, subtended by small, linear bracts.
Sepals: 5, green, narrowly ovate, pointed at the tip, up to 1/3 inch long, smooth.
Petals: 5, copper-yellow, free from each other, up to 1/2 inch long.
Stamens: Numerous.
Pistils: Ovary superior; styles 3, free from each other.
Fruits: Capsules ovoid, smooth, up to 1/4 inch long, with numerous black seeds.
Notes: Gleason and Cronquist use the name Clusiaceae for this family.

Previous Species -- Canadian St. John's-wort (Hypericum canadense)
Return to Species List -- Group 7
Next Species -- Slender St. John's-wort (Hypericum mutilum)

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Page Last Modified: Thursday, 03-Aug-2006 11:39:25 EDT
Menlo Park, CA [caww55]