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FNA | Family List | FNA Vol. 5 | Polygonaceae | Eriogonum

1h. Eriogonum microtheca Nuttall var. alpinum Reveal, Sci. Bull. Brigham Young Univ., Biol. Ser. 13(1): 31, fig. 19. 1971.

Sonora Pass wild buckwheat

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 abax-ially, 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.

Flowering Jul-Sep. Sandy to gravelly granitic or volcanic slopes, subalpine and alpine conifer woodlands; 2500-3300 m; Calif.

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.


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