Oenothera perennis - (image 1 of 4)
Taxonomy
Family: Onagraceae
Habitat
Moist, open ground. Fields, meadows, open woods.
Associates
Distribution
Newfoundland and Quebec to southern Manitoba, south VA to MO and in mountains to the Carolinas.
Morphology
Fibrous-rooted perennial, to 60 cm high. Leaves alternate, oblanceolate to elliptic, obtuse, narrowed to a petiolar base; cauline leaves over 1 mm wide; bracteal leaves well-developed and exceeding the ovary. Flowers 4-merous, diurnal, nodding but erect during anthesis; sepals reflexed; petals yellow, 5-10 mm, notched; style 3-10 mm; ovary 4-angled. Fruit sharply 4-angled.
Notes
Flowers June to July.
Wetland indicator: Facultative
I had this picture for several years and for some reason thought it was of Linum medium, but on closer inspection noticed it only had 4 petals and the distinctive x-shaped style of Oenothera.
References
Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second Ed.
The New York Botanical Garden. Bronx, NY
Swink, F. and G. Wilhelm. 1994. Plants of the Chicago Region.
Indiana Academy of Science. The Morton Arboretum. Lisle, Illinois.
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Michael Hough © 2005 |