Page authors: Don Knoke, David Giblin
Apocynum androsaemifolium
flytrap dogbane, spreading dogbane

Distribution: Occurring on both sides of the Cascades crest in Washington, but more common east of the crest; Alaska to California, east across North America to the Atlantic Coast.

Habitat: Common in forest openings, thickets, hillsides, roadsides, meadows and other open areas with dry soil, from low elevations to nearly subalpine areas.

Flowers: June-September

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Perennial herbs with milky juice, the freely-branched stems 2-5 dm. tall, glabrous to white-woolly.


Leaves opposite, entire, sub-sessile to petiolate, drooping, oblong-elliptic to ovate, 2.5-7 cm. long, often tipped with a sharp, slender point.


Inflorescence usually a terminal cyme, but often with axillary cymes as well; calyx less than half as long as the corolla, divided about its length, the 5 lobes ovate to lanceolate; corolla pinkish, 5-7 mm. long, from tubular to bell-shaped, the 5 lobes oblong-lanceolate, about the length of the tube, erect to 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, 5-14 cm. long, erect to reflexed.

Accepted Name:
Apocynum androsaemifolium L.
Publication: Sp. Pl. 1: 213. 1753.

Synonyms & Misapplications:
Apocynum ambigens Greene
Apocynum androsaemifolium L. ssp. pumilum (A. Gray) B. Boivin
Apocynum androsaemifolium L. var. androsaemifolium [HC]
Apocynum androsaemifolium L. var. pumilum A. Gray [HC]
Additional Resources:

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

WA Flora Checklist: Apocynum androsaemifolium checklist entry.

E-Flora BC: Apocynum androsaemifolium atlas page.

CalPhotos: Apocynum androsaemifolium photos.

USDA Plants: Apocynum androsaemifolium information.

60 photographs:
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