Page authors: David Giblin, Don Knoke
Asclepias fascicularis
narrow-leaf milkweed
WTU specimens
Other herbaria

Distribution: East of the Cascades in Washington; east to Idaho and Utah, reaching the coast in Oregon.

Habitat: Uncommon in shrub-steppe, usually along vernal stream beds.

Flowers: June-August

Origin: Native

Conservation Status: Not of concern

Description:
General:

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

Leaves:

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.

Flowers:

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.

Fruits:

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

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

Synonyms:
Asclepias mexicana auct. non Cav.
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.

30 photographs:
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