Page authors: David Giblin, Don Knoke
Oenothera cespitosa
WTU specimens
Other herbaria

Distribution: Occuring sporadically throughout central and eastern Washington; widespread throughout much of western U.S. and central Canada.

Habitat: Talus slopes, road cuts, and dry hills.

Flowers: May-July

Origin: Native

Conservation Status: Not of concern

Description:
General:

Tufted, acaulescent to short-stemmed perennial, under 2.5 dm. tall, glabrous to densely pubescent.

Leaves:

Leaves basal, narrowly to broadly oblanceolate, 10-25 cm. long and 1-2.5 cm. broad, with slender petioles about equal to the blades; blades pinnatifid to remotely toothed or nearly entire.

Flowers:

Flowers sessile or with short pedicels; calyx tube greenish or reddish, flared above, 5-12 cm. long, the 4 lobes reflexed, 2.5-3.5 cm. long; petals 4, 2.5-4.5 cm. long, white, aging to pinkish, obcordate; stamens 8, stigma with 4 lobes 5-8 mm. long; ovary inferior, 4-celled.

Fruits:

Capsule woody, oblong-ovoid, 1-4 cm. long, angled but not winged.

Accepted Name:
Oenothera cespitosa Nutt.

Synonyms:
(none provided)
Infraspecies:
ssp. cespitosa    Sporadic in central and eastern Washington; widespread throughout western U.S. and central Canada.
ssp. marginata    Occurring in southeastern Washington; widespread throughout western North America and into Texas.
Additional Resources:

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

WA Flora Checklist: Oenothera cespitosa checklist entry.

E-Flora BC: Oenothera cespitosa atlas page.

CalPhotos: Oenothera cespitosa photos.

USDA Plants: Oenothera cespitosa information.

46 photographs:
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