Northern Prairie Wildlife Research Center
Southern Wetland Flora
Field Office Guide to Plant Species
Atlantic St. Johnswort
Hypericum reductum (Svens.) W. P. Adams
- Family: St. Johnswort (Hypericaceae)
- Flowering: June-September
- Field Marks: This woody St. Johnswort differs from other woody species of Hypericum by its mat-forming habit and its needle-like leaves.
- Habitat: Low pinelands, flatwoods, wet prairies, around ponds, coastal dunes.
- Habit: Mat-forming shrub with several stems, the mat up to 3 feet across.
- Stems: Woody, spreading or ascending, usually not more than 2 feet tall, the bark exfoliating
into thin strips at maturity.
- Leaves: Opposite, simple, but with short branches of tiny leaves in the axils, needle-like, up
to 1/2 inch long, less than 1/20 inch wide, rolled under along the edges, dotted, smooth.
- Flowers: Several in terminal and axillary cymes, sometimes solitary in the leaf axils, up to 2/3 inch across.
- Sepals: 5, green, free from each other, up to 1/4 inch long.
- Petals: 5, yellow, free from each other, up to 1/3 inch long.
- Stamens: Numerous.
- Pistils: Ovary superior; styles 3.
- Fruits: Capsules narrowly oblongoid, 1/3-1/2 inch long; seeds black, minute.
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