Eriogonum microtheca var. alpinum

Reveal

Sci. Bull. Brigham Young Univ., Biol. Ser. 13(1): 31, fig. 19. 1971.

Common names: Sonora Pass wild buckwheat
Endemic
Treatment appears in FNA Volume 5. Treatment on page 246. Mentioned on page 244.
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Subshrubs, 0.4–1 × 1–3 dm. Stems: caudex spreading; aerial flowering stems 0.1–0.3 dm, white- or brownish-floccose to subglabrous. Leaves: blade linear-oblanceolate to narrowly elliptic, 0.3–0.7(–0.9) × 0.1–0.3 cm, densely white-tomentose abaxially, floccose to subglabrous adaxially, margins usually revolute. Inflorescences 0.5–2(–3) cm; branches floccose to subglabrous. Involucres (1.5–)2–2.5 mm, floccose or glabrous. Flowers 1.5–2.5 mm; perianth white to pink or rose. Achenes 1.5–2 mm.


Phenology: Flowering Jul–Sep.
Habitat: Sandy to gravelly granitic or volcanic slopes, subalpine and alpine conifer woodlands
Elevation: 2500-3300 m

Discussion

Variety alpinum is known only from the central Sierra Nevada and the Sweetwater Range in Alpine, Mono, and Tuolumne counties. It appears to be a high-elevation expression that evolved from var. laxiflorum.

Selected References

None.

Lower Taxa

None.
James L. Reveal +
Reveal +
Undefined subg. Eucycla +
Sonora Pass wild buckwheat +
2500-3300 m +
Sandy to gravelly granitic or volcanic slopes, subalpine and alpine conifer woodlands +
Flowering Jul–Sep. +
Sci. Bull. Brigham Young Univ., Biol. Ser. +
Eriogonum microtheca var. alpinum +
Eriogonum microtheca +
variety +