Page authors: Don Knoke, David Giblin
Hackelia diffusa
diffuse stickseed
WTU specimens
Other herbaria

Distribution: Occurring east of the Cascades in Washington; British Columbia south to Oregon.

Habitat: Cliffs and talus slopes.

Flowers: May-July

Origin: Native

Conservation Status: Not of concern

Description:
General:

Perennial from a taproot, the several stems 2-7 dm. tall, 2-5 mm. thick toward the base, the lower part with spreading, stiff hairs, the upper with appressed hairs.

Leaves:

Basal leaves petiolate, persistent, oblanceolate or narrowly elliptic, 6-18 cm. long and 8-25 mm. wide; cauline leaves well-developed, sessile, lanceolate to lance-elliptic, 5-12 cm. long and 8-18 mm. wide.

Flowers:

Inflorescence of nearly naked false-racemes; calyx cleft to the base; corolla white with a yellow eye, 5-lobed, the tube slender, the limb spreading abruptly, 7-12 mm. wide; puberulent appendages opposite the corolla lobes at the top of the tube; stamens not exerted; style shorter than the nutlets.

Fruits:

Nutlets 4, attached to the base of the style, with marginal prickles distinct to the base; intramarginal prickles 8-30, much shorter than the marginal ones.

Accepted Name:
Hackelia diffusa (Lehm.) I.M. Johnst.

Synonyms & Misapplications:
(none provided)
Infraspecies:
var. arida – diffuse stickseed
var. cottonii – diffuse stickseed
var. diffusa – diffuse stickseed
Additional Resources:

PNW Herbaria: Specimen records of Hackelia diffusa in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Hackelia diffusa checklist entry.

E-Flora BC: Hackelia diffusa atlas page.

CalPhotos: Hackelia diffusa photos.

USDA Plants: Hackelia diffusa information.

58 photographs:
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