Eriogonum sphaerocephalum
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.
| Eriogonum sphaerocephalum | |
|---|---|
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Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Order: | Caryophyllales |
| Family: | Polygonaceae |
| Genus: | Eriogonum |
| Species: | E. sphaerocephalum |
| Binomial name | |
| Eriogonum sphaerocephalum | |
Description
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.
Varieties
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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