Eriogonum acaule


Proc. Acad. Nat. Sci. Philadelphia 4: 13. 1848.

Common names: Single-stem wild buckwheat
EndemicConservation concern
Synonyms: Eriogonum caespitosum subsp. acaule (Nuttall) S. Stokes Eriogonum caespitosum var. acaule (Nuttall) R. J. Davis
Treatment appears in FNA Volume 5. Treatment on page 270. Mentioned on page 234, 264.

Herbs, matted, not scapose, 0.15–0.3 × 1–2 dm, tomentose, greenish. Stems matted, with persistent leaf bases, up to 1/8 height of plant; caudex stems matted; aerial flowering stems erect, slender, solid, not fistulose, 0.05–0.2 dm, tomentose. Leaves sheathing entire stem, 1 per node or fasciculate; petiole 0.05–0.15 cm, glabrous; blade linear to oblanceolate, 0.3–0.8 × 0.1–0.2 cm, densely white-tomentose on both surfaces, margins revolute. Inflorescences cymose or racemose, condensed, 0.2–0.5(–0.8) × 0.3–0.8 cm; branches dichotomous or secondaries suppressed, tomentose; bracts absent. Peduncles absent. Involucres 1 per node, campanulate, 1.5–3 × 1.5–3 mm, tomentose; teeth 4–5, erect to slightly spreading, 1–2 mm. Flowers 2–2.5 mm; perianth yellow, white-tomentose abaxially; tepals connate proximal 1/4, monomorphic, lanceolate; stamens exserted, 2.5–3 mm; filaments pilose proximally. Achenes light brown, 2–2.5 mm, sparsely pubescent.

Phenology: Flowering May–Jul.
Habitat: Gravelly or clayey flats and slopes, saltbush or sagebrush communities
Elevation: 2000-2500 m


Eriogonum acaule is the ultimate reduction in the E. brevicaule complex. The low, matted habit of this rather elegant species makes it attractive to rock garden enthusiasts. In Colorado, the Bureau of Land Management considers it a “sensitive” species; it is known only from Moffat County. It is encountered more frequently in Wyoming, where it is found in Albany, Carbon, Fremont, Lincoln, Natrona, Sublette, Sweetwater, Teton, and Uinta counties. The species is to be expected just south of the Daggett County line in northeastern Utah.

Selected References


Lower Taxa

... more about "Eriogonum acaule"
James L. Reveal +
Nuttall +
Undefined subg. Eucycla +
Single-stem wild buckwheat +
Colo. +  and Wyo. +
2000-2500 m +
Gravelly or clayey flats and slopes, saltbush or sagebrush communities +
Flowering May–Jul. +
Proc. Acad. Nat. Sci. Philadelphia +
Endemic +  and Conservation concern +
Eriogonum caespitosum subsp. acaule +  and Eriogonum caespitosum var. acaule +
Eriogonum acaule +
Eriogonum subg. Eucycla +
species +