Flora of North America species comparison

60-170 cm, erect;

nodes (5)6-8, pubescent;

internodes usually glabrous, sometimes pubescent near the nodes.

60-120 cm tall, to 3 mm thick, erect, glabrous or puberulent.

pilose, midrib of the culm leaves not abruptly narrowed just below the collar;

auricles absent;

ligules 2-4 mm, glabrous, truncate, erose or lacerate;

blades 20-35(37) mm long, 6-16 mm wide, flat, abaxial surfaces glabrous, adaxial surfaces pilose.

usually smooth or scabrous, sometimes hairy except at the throat;

auricles absent;

ligules (1)2-2.5 mm, glabrous, obtuse, erose;

blades 10-31 cm long, 2-9 mm wide, flat, sometimes scabrous, usually glabrous, rarely puberulent to pubescent near the collar.

10-25 cm, open, nodding;

branches ascending, spreading, or drooping.

10-20 cm, open to somewhat contracted;

lower branches shorter than 10 cm, (1)2-3 per node, erect, ascending or spreading, with 1-2 spikelets variously distributed.

20-30 mm, elliptic to lanceolate, terete to moderately laterally compressed, with (4)6-10 florets.

20-35 mm, shorter than at least some pedicels and branches, elliptic to lanceolate, strongly laterally compressed, not crowded or overlapping, with 6-11 florets.

pubescent;

lower glumes 6-8.5 mm, 1(3)-veined;

upper glumes 8-11.5 mm, 3-veined, not mucronate;

lemmas 10-12 mm, lanceolate, rounded over the midvein, backs pubescent, margins more densely so, apices acute, entire;

awns 3.5-7 mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 2-4 mm.

smooth or scabrous;

lower glumes (5.5)7-10(11.5) mm, 3-veined;

upper glumes (7.5) 9-11(12.5) mm, 5-7-veined, shorter than the lowest lemma;

lemmas 12-15 mm, lanceolate, laterally compressed, strongly keeled at least distally, glabrous, sometimes scabrous, 7-9-veined, veins usually not raised or riblike, apices entire or with acute teeth, teeth shorter than 1 mm;

awns 4-7 mm;

anthers 1-5 mm.

= 28.

= 56.