Plants annual; tufted, without innovations. Culms (2) 6-25 cm, usually erect, sometimes decumbent, glabrous, with elliptical, yellowish, glandular pits below the nodes. Sheaths with elliptical glandular pits, sparsely hairy at the throat, hairs to 2 mm; ligules 0.2-0.5 mm, ciliate; blades 2-12 cm long, 1-3 mm wide, flat to involute, abaxial surfaces scabridulous, bases with glandular pits. Panicles terminal, 4-10 (15) cm long, 0.5-2 cm wide, narrowly elliptic, contracted, dense; primary branches alternate, usually appressed, occasionally diverging to 30° from the rachises, rachises and branches with glandular pits; pulvini glabrous; pedicels 1.4-10 mm, appressed or divergent. Spikelets 3.6-7.5 mm long, 1.2-2 mm wide, narrowly ovate, light yellowish, occasionally mottled with red¬dish-purple, with 6-11 (14) florets; disarticulation acropetal, paleas persistent. Glumes subequal, ovate to lanceolate, hyaline; lower glumes (0.7) 0.9-1.4 mm; upper glumes 1.2-1.8 mm; lemmas 1.5-2.2 mm, ovate, subhyaline, stramineous, veins greenish and conspicu¬ous, apices acute; paleas 1.2-2 mm, hyaline, keels scabridulous, apices obtuse; anthers 3, 0.2-0.3 mm, purplish. Caryopses 0.5-0.8 mm, pyriform except slightly flattened adaxially, smooth, light-brown. 2n = unknown.
Colo., N.Mex., Wash., Calif., Oreg., Ariz., Idaho, Nev.
Eragrostis lutescens grows on the sandy banks of streams and lakes and in moist alkaline flats of the western United States at 300-2000 m. It has not been reported from Mexico.
"decumbent" is not a number.