Northern Prairie Wildlife Research Center
Northeast Wetland Flora
Field Office Guide to Plant Species
Oenothera fruticosa L.
- Family: Evening-primrose (Onagraceae)
- Flowering: May-August
- Field Marks: The capsules are obovoid, 4-angled, and taper to a long stalk finely hairy but
not glandular. The tube of the sepals is 1/4-3/4 inch long.
- Habitat: Wet meadows, fields, marshes, edge of woods, sometimes in brackish areas.
- Habit: Perennial herb from fibrous rootstocks.
- Stems: Upright or sprawling and matted, finely hairy, up to 2 1/2 feet tall.
- Leaves: Usually opposite, linear to oblong to lanceolate, pointed at the tip, tapering to the sessile or short-stalked base, without teeth, finely hairy, up to 2 1/2 inches long.
- Flowers: Diurnal, few at the tips of the stem, notched at the tip, yellow, up to 3 inches across, on long, finely hairy stalks.
- Sepals: 4, green, united below to form a tube 1/4-3/4 inch long, finely hairy but not glandular.
- Petals: 4, yellow, free from each other, obovate, up to 1 1/2 inches long.
- Stamens: 8.
- Pistils: Ovary inferior, 4-sided.
- Fruits: Capsules obovoid, 4-angled, up to 1/2 inch long, finely hairy but not glandular, tapering to a long stalk.
- Notes: This is an extremely variable species, particularly with respect to growth form and degree of hairiness. Some authors have recognized three taxonomic varieties of this species. Gray's Manual identifies at least five varieties. Although the Atlas of the Georgia Flora does not list this species for Georgia, at least one Georgia botanist thinks it occurs in that state. Georgia is not shaded in the range map because there are apparently no specimens collected from that state, althought the probability that this plant occurs in Georgia is strong.
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