Eriogonum sphaerocephalum

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Eriogonum sphaerocephalum
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Core eudicots
Order: Caryophyllales
Family: Polygonaceae
Genus: Eriogonum
Species: E. sphaerocephalum
Binomial name
Eriogonum sphaerocephalum
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.

The inflorescence arises on a stalk and bears many yellow flowers in a head-like cluster or umbel.


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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