Page authors: Don Knoke, David Giblin
Wyethia amplexicaulis
northern mule's ears, smooth dwarf sunflower

Distribution: Occurring east of the Cascades crest in Washington; Washington to Nevada, east to the Rocky Mountains.

Habitat: Seasonally moist areas in sagebrush-steppe, to open areas at moderate elevations.

Flowers: May-July

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Bumblebees, bees, butterflies, flies, beetles


Tap-rooted, glabrous, leafy-stemmed perennial, the stems stout but lax, 3-8 dm. tall, resinous throughout.


Leaves firm, mostly entire, the basal ones enlarged, the blades elliptic or lance-elliptic, 2-6 dm. long and 5-16 cm. wide, tapering to a short petiole, the cauline leaves smaller, sessile, becoming ovate or lance-ovate and clasping.


Heads usually several, the central one larger; involucral bracts broad and herbaceous, in several series, often surpassing the disk; rays 13-21 in the terminal head, chrome-yellow, pistillate and fertile, 2.5-5 cm. long; disk flowers numerous, light yellow, perfect and fertile; receptacle broadly convex, chaffy throughout, the bracts clasping the achenes; pappus of petal-like appendages.


Achenes compressed-quadrangular.

Accepted Name:
Wyethia amplexicaulis (Nutt.) Nutt.
Publication: Trans. Amer. Philos. Soc., n. s. 7: 352. 1840.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Wyethia amplexicaulis in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Wyethia amplexicaulis checklist entry

OregonFlora: Wyethia amplexicaulis information

E-Flora BC: Wyethia amplexicaulis atlas page

CalPhotos: Wyethia amplexicaulis photos

42 photographs:
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