Plants herbs, compact or spreading, matted, 0.3–2 dm tall, 0.5–3 dm across, floccose or glabrous; stems with caudex absent or spreading, the aerial flowering stems prostrate to weakly erect, slender, solid, not fistulose, usually arising directly from a taproot, 0.3–1.5 (1.8) dm long, villous to floccose or glabrous; leaves basal, mostly in loose rosettes, the petioles 1–4 cm long, tomentose to floccose, the blades ovate to round, 1–2.5 (4) cm long, 0.8–2 cm wide, grayish- to tannish-lanate or tomentose abaxially, glabrous and green adaxially, or glabrous on both surfaces, the margins entire, plane; inflorescences capitate or umbellate, 1–3 (5) cm long, 1– 4 cm wide, the branches floccose or glabrous, the bracts 2, foliaceous, (0.4) 1–2 cm long, 0.1–0.2 (0.4) cm wide, sometimes absent immediately below involucre; involucres 1 per node (occasionally appearing clustered), campanulate, 4–6 mm long, (3) 4–8 mm wide, pilose or glabrous, the teeth 4–5, erect, 0.6–1 mm long; flowers 4–6 mm long, including a 0.1–0.2 mm long stipelike base, the perianth white to rose, pilose to villous with intermixed glandular hairs abaxially, the tepals monomorphic, obovate, the stamens exserted, 4–8 mm long, the filaments pilose proximally; achenes light brown to brown, 4–5 mm long, glabrous except for pilose beak.
- Leaf blades densely lanate to tomentose abaxially, mostly glabrous adaxially : Eriogonum pyrolifolium var. coryphaeum
- Leaf blades glabrous on both surfaces : Eriogonum pyrolifolium var. pyrolifolium
Eriogonum pyrolifolium var. pyrolifolium: Aerial flowering stems mostly ascending, 0.3–1 dm tall; leaf blades glabrous on both surfaces; perianth sparsely pilose, with glandular hairs evident.
Flowering Jul-Sep. Sandy to gravelly, usually volcanic flats, slopes, and ridges, mixed grassland, sagebrush, and mountain meadow communities, oak, montane, and subalpine conifer woodlands; (800) 1600–3300 m; Kittitas Co. in south-central Washington, on Little Mt. Hoffman, Mt. Lassen, and Mt. Shasta in Siskiyou and Shasta cos. of northern California, and in Blaine, Boise, Custer, Elmore, Lemhi, and Valley cos. of central Idaho.