Asclepias cryptoceras
pallid milkweed
WTU specimens
Other herbaria

Distribution: Asotin County, Washington and Grant County, Oregon, to Payette County, Idaho, south to California and Colorado.

Habitat: Gravelly to heavy clay soil in the hills and lower mountains.

Flowers: April - June

Origin: Native

Conservation Status: Threatened in Washington (WANHP)

Description:
General:

Herbaceous, rather fleshy perennial from a large, woody root, the stems prostrate or decumbent, 1-3 dm. long.

Leaves:

Leaves opposite, obovate to oval, 2-6 cm. long and nearly as broad, glabrous except for small, marginal hairs.

Flowers:

Inflorescence usually of terminal umbels, the central one 5-10 flowered, with peduncle and pedicles 2-4 cm. long, the lateral ones few-flowered and sessile; sepals 5, linear to lanceolate, 5-9 mm. long, green, with long, fine, tangled hairs; corolla pale greenish-yellow, the 5 lobes lanceolate, 8-12 mm. long, reddish tinged on the back, reflexed; stamens 5, attached to the base of the corolla tube and to each other, forming a column, to which are attached saccate structures, pinkish, bi-lobed above, the lobes projecting into erect teeth that exceed the anthers; pistil 1, 2-carpellary, the ovaries superior and distinct.

Fruits:

Follicles ovoid, 3-5 cm. long, smooth.

Accepted Name:
Asclepias cryptoceras S. Watson
Publication: Botany Fortieth Parallel 283, pl. 28, f. 1-4. 1871.

Synonyms & Misapplications:
Asclepias cryptoceras S. Watson ssp. davisii (Woodson) Woodson [KZ99]
Asclepias cryptoceras S. Watson var. davisii (Woodson) W.H. Baker
Asclepias davisii Woodson
Additional Resources:

PNW Herbaria: Specimen records of Asclepias cryptoceras in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Asclepias cryptoceras checklist entry.

E-Flora BC: Asclepias cryptoceras atlas page.

CalPhotos: Asclepias cryptoceras photos.

USDA Plants: Asclepias cryptoceras information.

26 photographs:
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