Flora of North America species comparison

30-90 cm tall, to 3 mm thick, erect.

40-90 cm, erect;

nodes (3)4-7(8), these and the internodes pubescent or glabrous.

retrorsely pilose, sometimes mostly glabrous, throats sometimes with hairs;

auricles absent;

ligules 1-4 mm, usually glabrous, obtuse, erose;

blades 8-18 cm long, 3-9 mm wide, flat, sparsely pilose on both surfaces or the abaxial surfaces glabrous.

glabrous or pilose, midrib of the culm leaves abruptly narrowed just below the collar;

auricles often present on the lower leaves;

ligules to 1 mm, truncate;

blades 14-22(26) cm long, to 6 mm wide, flat, glabrous or pilose, not glaucous.

12-25 cm, somewhat contracted or open;

lower branches shorter than 10 cm, 2-3(5) per node, initially erect to ascending, spreading at maturity, with 1-2 spikelets variously distributed.

10-20 cm, open, nodding;

branches ascending or spreading.

18-25 mm, elliptic to lanceolate, strongly laterally compressed, with 4-8 florets.

(14)15-30 mm, elliptic to lanceolate, terete to moderately laterally compressed, with 4-12 florets.

subequal, smooth or scabrous;

lower glumes 8-12.5 mm, 3-veined;

upper glumes 9.5-14 mm, 7-veined, about as long as the lowest lemma;

lemmas 9.5-14 mm, lanceolate, laterally compressed, prominently 7-veined, strongly keeled at least distally, glabrous or pubescent distally or throughout, marginal hairs, if present, longer than those elsewhere, apices entire or with acute teeth shorter than 1 mm;

awns 6-13 mm, sometimes slightly geniculate;

anthers 0.4-0.5 mm.

usually pubescent, rarely glabrous;

lower glumes 5-6 mm, 1-3-veined;

upper glumes 6-8 mm, 3-veined, sometimes mucronate;

lemmas 7-10 mm, elliptic to lanceolate, rounded over the midvein, backs and margins pubescent, apices acute to obtuse, entire;

awns 1-3(5) mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 2-4 mm.

= 84.

= 14.