Page authors: Don Knoke, David Giblin
Helianthella uniflora
Rocky Mountain helianthella
WTU specimens
Other herbaria

Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to Oregon and Nevada, east to the Rocky Mountains.

Habitat: Dry, open woods at low to mid-elevations.

Flowers: May-August

Origin: Native

Conservation Status: Not of concern

Description:
General:

Perennial from a branching, short, woody base, the stems clustered, 2-10 dm. tall, covered with stiff, short hairs.

Leaves:

Leaves mostly opposite along the stem, scabrous, lanceolate to elliptic, triple-nerved, up to 15 cm. long and 5 cm. wide, the lowermost ones oblanceolate and smaller.

Flowers:

Heads mostly solitary, the disk 1.5-3 cm. wide; involucral bracts lance-linear, in several series, scabrous, with hairs along the edges; rays usually about 13, 2-4.5 cm. long, yellow; disk flowers numerous, yellow; receptacle chaffy throughout; pappus of several short scales and 2 persistent awns.

Fruits:

Achenes clasped by the inner involucral bracts.

Identification Notes:

The two awns on the achenes of Helianthella are persistant; those on Helianthus are readily deciduous.

Accepted Name:
Helianthella uniflora (Nutt.) Torr. & A. Gray
Publication: Fl. N. Amer. 2: 334. 1842.

Synonyms & Misapplications:
(none provided)
Infraspecies:
var. douglasii – Rocky Mountain helianthella    East of the Cascades in Washington and Oregon, east to Montana
Additional Resources:

PNW Herbaria: Specimen records of Helianthella uniflora in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Helianthella uniflora checklist entry.

E-Flora BC: Helianthella uniflora atlas page.

CalPhotos: Helianthella uniflora photos.

USDA Plants: Helianthella uniflora information.

53 photographs:
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