Page authors: David Giblin, Don Knoke
Asclepias fascicularis
Mexican whorled milkweed, narrow-leaf milkweed

Distribution: Occurring east of the Cascades crest in Washington; northeastern Washington to Baja California, Mexico, east to Idaho, Utah, and Arizona.

Habitat: Sagebrush desert, usually along vernal stream beds.

Flowers: June-August

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Mostly glabrous perennial herbs from rhizomes, the stems 3-8 dm. tall, the juice milky.


Leaves mostly whorled and 3-6 per node, the upper often opposite, linear-lanceolate to narrowly oblanceolate, 5-15 cm. long and 3-12 mm. broad.


Inflorescence of many-flowered umbels, usually 2 or more in the upper axils, puberulent; peduncles 2-6 cm. long, pedicels 2-15 mm. long; sepals 5, greenish to pinkish-tinged, 2 mm. long, puberulent; corolla lobes 5, 2-4.5 mm. long, pale to dark pinkish-purple; stamens 5, attached to the base of the corolla tube and to each other, forming a column, to which are attached saccate structures 1-2 mm. long, with longer, erect projections; pistil 1, 2-carpellary, the ovaries superior and distinct.


Follicles erect, 6-12 cm. long, narrow, smooth.

Accepted Name:
Asclepias fascicularis Decne.
Publication: Prodr. 8: 569. 1844.

Synonyms & Misapplications:
(none provided)
Additional Resources:

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

WA Flora Checklist: Asclepias fascicularis checklist entry.

E-Flora BC: Asclepias fascicularis atlas page.

CalPhotos: Asclepias fascicularis photos.

USDA Plants: Asclepias fascicularis information.

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