Flora of North America species comparison

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

20-70 cm tall, to 3 mm thick, sometimes geniculate at the base.

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.

usually smooth or scabridulous, sometimes slightly pubescent distally, not pilose at the throat;

auricles absent;

ligules 1-6 mm, densely hairy to ciliolate, acute to obtuse, erose;

blades 6-13 cm long, 6-8 mm wide, flat, both surfaces glabrous, sometimes scabrous.

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.

9-20 cm long, 2-2.5 cm wide, dense;

lower branches shorter than 10 cm, 2-4 per node, erect, with 1-2 spikelets variously distributed.

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

20-40 mm, usually longer than the branches and pedicels, elliptic to lanceolate, strongly laterally compressed, crowded, overlapping, with 3-7 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.

pubescent;

lower glumes 8-12 mm, (3)5(7)-veined;

upper glumes 10-13 mm, 7(9)-veined, shorter than the lowest lemma;

lemmas 12-14 mm, lanceolate, laterally compressed, distinctly 9-11-veined, strongly keeled at least distally, more or less uniformly hairy, often with bronze hyaline margins, apices entire or with acute teeth shorter than 1 mm;

awns (2)4-7 mm;

anthers 2-4 mm.

= 84.

= 56.