Eriogonum microtheca var. microtheca

Common names: Slender wild buckwheat
Endemic
Synonyms: Eriogonum microtheca var. idahoense S. Stokes
Treatment appears in FNA Volume 5. Treatment on page 247. Mentioned on page 243.

Shrubs, (2.5–)3–5 × 3–7 dm. Stems: caudex absent; aerial flowering stems 0.3–0.7 dm, floccose or glabrous. Leaves: blade oblanceolate to elliptic, (0.8–)1–2(–2.7) × (0.3–)0.4–0.9(–1.2) cm, densely white-tomentose abaxially, floccose or glabrous adaxially, margins not revolute. Inflorescences 3–10 cm; branches floccose or glabrous. Involucres 2.5–3 mm, floccose or glabrous. Flowers 2–2.5 mm; perianth yellow. Achenes 2–2.5 mm.


Phenology: Flowering Jul–Sep.
Habitat: Gravelly to rocky slopes, saltbush and sagebrush communities, juniper and conifer woodlands
Elevation: 600-1100 m

Discussion

Variety microtheca is found in the foothills and low mountains north of the Intermountain Region in Baker, Crook, Grant, Malheur, Sherman, Wasco, and Wheeler counties in Oregon. Scattered populations also occur in Washington County, Idaho. The variety is disjunct onto the Pueblo Mountains of Harney County, Oregon.

Selected References

None.

Lower Taxa

None.
James L. Reveal +
Slender +
Undefined subg. Eucycla +
Slender wild buckwheat +
Idaho +  and Oreg. +
600-1100 m +
Gravelly to rocky slopes, saltbush and sagebrush communities, juniper and conifer woodlands +
Flowering Jul–Sep. +
Proc. Acad. Nat. Sci. Philadelphia +
Eriogonum microtheca var. idahoense +
Eriogonum microtheca var. microtheca +
Eriogonum microtheca +
variety +