Dougl. ex Benth.
Eriogonum sphaerocephalum is a species of wild buckwheat known by the common name rock buckwheat. It is native to the western United States from northeastern California to Idaho, where it is a common member of several habitat types, such as sagebrush.
This is a small shrub or subshrub up to half a meter tall and wide, growing from a caudex and producing erect flowering stems. The woolly leaves are widely lance-shaped to somewhat oval and 1 to 4 centimeters long, and form basal rosettes around the caudex.
There are several varieties of this species:
- E. s. var. fasciculifolium is endemic to Idaho.
- E. s. var. halimioides is a widespread variety with very pale yellow flowers.
- E. s. var. sphaerocephalum has bright yellow flowers.
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