Page authors: Don Knoke, David Giblin
Oenothera glazioviana
red-sepal evening-primrose

Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California; also in scattered locations in the eastern U.S.

Habitat: Disturbed soil.

Flowers: June-September

Origin: Introduced from Europe

Growth Duration: Biennial

Conservation Status: Not of concern

Pollination: Bees, moths


Large, erect biennial, the stem with conspicuous red blotches and numerous red-based hairs.


Leaves alternate, lanceolate, strongly crinkled, petiolate, the blades 5-10 cm. long and about 1/3 as wide, the mid-rib white.


Flowers in elongate, bracteate spikes; calyx tube red-striped, over 2 cm. long, the 4 lobes distinct, reflexed, 2.5-4 cm. long; petals yellow, fading to reddish, 3-5 cm. long, slightly notched; stamens 8; styles longer than the stamens; stigmas with 4 linear lobes 4-6 mm. long; ovary inferior, 4-celled.


Capsule tapering to the tip.

Accepted Name:
Oenothera glazioviana Micheli
Publication: Flora Brasiliensis 13(2): 178. 1875.

Synonyms & Misapplications:
Oenothera erythrosepala Borbás
Additional Resources:

PNW Herbaria: Specimen records of Oenothera glazioviana in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Oenothera glazioviana checklist entry

OregonFlora: Oenothera glazioviana information

E-Flora BC: Oenothera glazioviana atlas page

CalPhotos: Oenothera glazioviana photos

12 photographs:
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