Eriogonum codium Reveal, Caplow & K. Beck
Family: Polygonaceae
Umtanum Desert buckwheat
not available
Herbs, matted, not scapose, 0.3-1 × (1-)2-7(-9) dm, tomentose, greenish. Stems matted, with persistent leaf bases, up to 4 height of plant; caudex stems matted; aerial flowering stems erect, slender, solid, not fistulose, 0.2-0.9 dm, floccose.  Leaves basal, fasciculate in terminal tufts; petiole 0.2-0.8(-1) cm, tomentose; blade oblanceolate to elliptic, (0.5-)0.6-1.2 × 0.3-0.6 cm, densely white-tomentose on both surfaces, margins plane. Inflorescences cymose-umbellate or cymose, 1-2 × 1-4 cm, tomentose; branches dichotomous, floccose; bracts triangular, scalelike, 1-2.5 mm. Peduncles erect, slender, (0.15-)0.2-0.5(-0.7) cm, floccose. Involucres 1 per node, turbinate-campanulate, 2.5-4 × 2-2.5 mm, membranous, tomentose to floccose; teeth 5, erect, 0.8-1.2(-1.5) mm. Flowers 2-3 mm; perianth lemon yellow, thinly tomentose; tepals connate proximal 1/ 2, monomorphic, broadly oblong to oblong; stamens slightly exserted, 2.5-3.5 mm; filaments sparsely pilose proximally. Achenes light brown, 2.5-3 mm, sparsely tomentose. Flowering May-Aug. Gravelly volcanic soils, mixed grassland, saltbush and sagebrush communities; of conservation concern; 300-400 m; Wash. Eriogonum codium is a potentially endangered species known from a single site on volcanic bluffs overlooking the Columbia River in Hanford Research National Monument in Benton County. It is worthy of cultivation as a rock-garden plant, although little or no sexual reproduction is known in the natural population. The Umtanum Desert wild buckwheat is a candidate for federal listing and is considered an endangered species by the state of Washington. Much of the population was destroyed in a man-caused fire in 1997. The species is in the Center for Plant Conservation's National Collection of Endangered Plants.

The National Science Foundation
This project made possible by National Science Foundation Award 1410069