Plants perennial; rhizomatous, sometimes also stoloniferous, with many innovations and scaly, sharp-tipped rhizomes 4-8 mm thick. Culms 15-40 (50) cm, erect, stiff, hard. Sheaths hairy at the apices, hairs to 2 mm; ligules 0.2-0.4 mm, membranous, ciliate; blades 2-15 cm long, (1) 2-4 mm wide, involute, arcuate, glabrous abaxially, scabrous adaxially, apices sharply pointed. Panicles terminal, 6-20 (24) cm long, 2-8 (12) cm wide, ovate, open or contracted; primary branches 1-8 (15) cm, appressed or diverging up to 50° from the rachises; pulvini glabrous or not; pedicels 0-8 mm, appressed, lower pedicels on each branch shorter than 1 mm. Spikelets 8-14 mm long, 1.4-3 mm wide, ovate to lanceolate, stramineous with a reddish-purple tinge, with 5-10 florets; disarticulation basipetal, glumes persistent. Glumes unequal, chartaceous; lower glumes 2.4-3.6 mm; upper glumes 3-4.5 mm, sometimes 3-veined; lemmas 3.8-4.5 mm, ovate, leathery, 3 (4, 5) -veined, lateral-veins evident, greenish, upper margins hyaline, apices acute to obtuse, usually erose; paleas 3.8-4.5 mm, membranous, keels scabridulous, apices obtuse to truncate; anthers 3, 2-2.4 mm, purplish to yellowish. Caryopses 1.6-2 mm, ellipsoid, dorsally flattened, with a shallow adaxial groove, striate, reddish-brown. 2n = 40.
"decumbent" is not a number.