Flora of North America species comparison

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Eriogonum microthecum var. alpinum
Photo is of parent taxon

alpine slender buckwheat, Sonora Pass wild buckwheat
Habit 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.

Eriogonum microthecum var. alpinum
Phenology Flowering Jul–Sep.
Habitat Sandy to gravelly granitic or volcanic slopes, subalpine and alpine conifer woodlands
Elevation 2500-3300 m (8200-10800 ft)
Distribution
from FNA
CA
[BONAP county map]
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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 5, p. 246.
Parent taxa Polygonaceae > subfam. Eriogonoideae > Eriogonum > subg. Eucycla > Eriogonum microthecum
Sibling taxa
E. microthecum var. ambiguum, E. microthecum var. arceuthinum, E. microthecum var. corymbosoides, E. microthecum var. johnstonii, E. microthecum var. lacus-ursi, E. microthecum var. lapidicola, E. microthecum var. laxiflorum, E. microthecum var. microthecum, E. microthecum var. panamintense, E. microthecum var. phoeniceum, E. microthecum var. schoolcraftii, E. microthecum var. simpsonii
Name authority Reveal: Sci. Bull. Brigham Young Univ., Biol. Ser. 13(1): 31, fig. 19. (1971)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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