Eriogonum corymbosum Bentham var. thompsoniae (S. Watson) S. L. Welsh

Herbs, spreading, not scapose, 2-5(-6) × 2-5 dm, glabrous, green. Stems spreading, without persistent leaf bases, up to 5 height of plant; caudex stems spreading, glabrous; aerial flowering stems erect, slender, solid, not fistulose, 1.2-3 dm, glabrous, tomentose among leaves. Leaves basal or sheathing up stem less than 2 cm, 1 per node; petiole (0.1-)3-7(-10) cm, tomentose to floccose or glabrous; blade linear or oblong to oblanceolate or elliptic, 2-8(-10) × 0.2-2.5(-3) cm, thinly to densely white-tomentose abaxially, glabrous and green adaxially, margins plane or slightly revolute. Inflorescences cymose, open, 10-30 × 10-25 cm; branches dichotomous, glabrous; bracts 3, scalelike, linear, 2-5(-7) mm. Peduncles absent. Involucres 1 per node, turbinate, 2-3(-3.5) × 1-1.5(-2) mm, glabrous; teeth 5, erect, 0.4-0.5 mm. Flowers 3-3.5 mm; perianth yellow or white, glabrous; tepals connate only at base, monomorphic, oblong to obovate; stamens slightly exserted, 3-3.5(-4) mm; filaments sparsely pilose proximally. Achenes light brown to brown, 2.5-3 mm, glabrous except for slightly papillate beak.

Varieties 3 (3 in the flora): w United States.