Plants perennial; usually anthocyanic; extensively rhizomatous, loosely tufted, culms solitary or a few together. Basal branching mainly extravaginal. Culms 20-40 (75) cm, erect or the bases decumbent, not branching above the base, terete or weakly compressed; nodes terete, proximal nodes usually not exserted. Sheaths closed for 2/5 – 1/2 their length, terete, glabrous, smooth or slightly scabrous, bases of basal sheaths glabrous, distal sheath lengths (1) 1.2-3.5 times blade lengths; collars smooth, glabrous; ligules 1.5-4 (6) mm, smooth, apices obtuse to acute, not ciliate; blades 1-3.5 (5) mm wide, folded or flat, innovation shoot blades involute, soft, abaxial surfaces glabrous, adaxial surfaces smooth or sparsely scabrous, frequently sparsely hairy with 0.2-0.8 mm hairs, slender, erect to appressed, curving, sinuous or straight, apices narrowly prow-shaped, cauline blades subequal, flag leaf-blades 1.5-8 cm. Panicles 5-9 (17) cm, narrowly lanceoloid to narrowly pyramidal, loosely contacted to open, sparse, with 25-60 spikelets and 2-5 branches per node; branches 1-3 cm, ascending to spreading, slightly flexuous to fairly straight, terete, smooth or sparsely scabrous, usually with 1-5 spikelets per branch, the spikelets moderately crowded in the distal 1/2. Spikelets 4-6.5 (8) mm, lengths to 3 times widths, laterally compressed; florets 2-4 (6); rachilla internodes shorter than 1 mm, smooth, usually glabrous, rarely with a few hairs. Glumes unequal to subequal, usually distinctly shorter than the adjacent lemmas, lanceolate, distinctly keeled, keels smooth to sparsely scabrous; lower glumes 2.8-3.5 mm, narrowly lanceolate, (1) 3-veined; upper glumes 4-4.5 (5) mm, distinctly shorter than to nearly equaling the lowest lemmas; calluses dorsally webbed, webs copious, hairs at least 1/2 times the lemma length, sometimes secondary webs present under the marginal veins; lemmas 3.7-4.5 (5) mm, lanceolate, usually strongly purple, distinctly keeled, keels, lateral-veins, and marginal veins copiously hairy, hairs cottony, lateral-veins prominent, less hairy, intercostal regions glabrous, usually smooth or finely muriculate, sometimes sparsely scabrous distally, margins narrowly hyaline, glabrous, apices acute; palea keels sparsely scabrous, long-villous at midlength, intercostal regions narrow, glabrous; anthers 1.8-2.5 mm. 2n = 56, ca. 70.
"decumbent" is not a number.