Page authors: Don Knoke, David Giblin
Apocynum ×floribundum
western dogbane

Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.

Habitat: Dry, open areas, gen in valleys and at lower elevations in the mountains.

Flowers: June-September

Origin: Native

Conservation Status: Not of concern


Perennial herbs with milky juice, the branched stems 2-6 dm. tall, glabrous or pubescent.


Leaves opposite, entire, spreading, sub-sessile to petiolate, ovate-lanceolate to ovate, obtuse to acute at the tip and rounded to cordate at the base, 4-8 cm. long.


Inflorescence of terminal and axillary cymes; calyx divided nearly to the base, the 5 lobes lanceolate, about as long as the corolla tube; corolla 4.5-6 mm. long, bell-shaped, pinkish, the 5 lobes spreading; there are triangular, awl-shaped appendages alternate with the bases of the 5 stamens in the corolla tube; style very short, enlarged; ovary superior.


Follicles 2, elongate, 7-14 cm. long, pendulous.

Accepted Name:
Apocynum ×floribundum Greene
Publication: Erythea 1(7): 151. 1893.

Synonyms & Misapplications:
Apocynum medium Greene [HC, KZ99]
Additional Resources:

PNW Herbaria: Specimen records of Apocynum ×floribundum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Apocynum ×floribundum checklist entry.

E-Flora BC: Apocynum ×floribundum atlas page.

CalPhotos: Apocynum ×floribundum photos.

USDA Plants: Apocynum ×floribundum information.

3 photographs:
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