Eriogonum soredium
Great Basin Naturalist 41: 229, fig. 1. 1981.
Herbs, matted, scapose, 0.01–0.1 × 1–3 dm, densely white-tomentose, whitish. Stems matted, with persistent leaf-bases, up to 1/5 height of plant; caudex stems matted; aerial flowering-stems scapelike, erect, slender, solid, not fistulose, 0.02–0.15 dm, tomentose. Leaves basal, fasciculate and sheathing nearly entire length of stem; petiole 0.05–0.2 (–0.3) cm, tomentose; blade narrowly elliptic to narrowly oblong, 0.2–0.7 × (0.07–) 0.1–0.25 cm, densely white-tomentose, margins plane. Inflorescences capitate, 0.5–1 cm; branches absent; bracts 6–8, scalelike, lanceolate to narrowly triangular, 1.3–1.6 mm. Peduncles absent. Involucres 4–6 per cluster, turbinate, 2–2.5 × 1.3–1.5 mm, rigid; teeth (4–) 5, erect, 0.5–0.6 mm. Flowers (1.5–) 2–2.5 mm; perianth white, glabrous; tepals connate proximal 1/4, slightly dimorphic, oblanceolate to ovate or obovate, those of outer whorl 1.5–2 mm wide, those of inner whorl 1–1.5 mm wide; stamens included, 2–2.5 mm; filaments sparsely pubescent proximally. Achenes light-brown, 2–2.5 mm, glabrous.
Phenology: Flowering Jun–Sep.
Habitat: Gravelly to rocky limestone slopes, mixed saltbush and sagebrush communities, pinyon-juniper woodlands
Elevation: 2000-2300 m
Discussion
Of conservation concern.
Eriogonum soredium is a rare and localized species known only from the San Francisco Mountains of Beaver County. It is considered a “sensitive” species in Utah, and occasionally is seen in cultivation.
Selected References
None.
Lower Taxa
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