Flora of North America species comparison

60-170 cm, erect;

nodes (5)6-8, pubescent;

internodes usually glabrous, sometimes pubescent near the nodes.

120-180 cm tall, 3-5 mm thick, erect.

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.

glabrous or sparsely pilose;

auricles absent;

ligules 3-4 mm, glabrous or hairy, obtuse, lacerate;

blades 20^40 cm long, 2-9 mm wide, flat, sparsely pilose adaxially or on both surfaces.

10-25 cm, open, nodding;

branches ascending, spreading, or drooping.

25-35 cm, open;

lower branches to 20 cm, 2-4(6) per node, spreading, often drooping, with 1-3 spikelets on the distal 1/2 sometimes confined to the tips.

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

18-38 mm, elliptic to lanceolate, strongly laterally compressed, with (5)6-9 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.

glabrous, sometimes scabrous;

lower glumes 6-10 mm, 3-5-veined;

upper glumes 8-11 mm, 5-7-veined;

lemmas 12-14(15) mm, lanceolate, laterally compressed, 7-11-veined, strongly keeled at least distally, usually glabrous, sometimes hirtellous, margins sometimes sparsely pilose, apices entire or with acute teeth, teeth shorter than 1 mm;

awns 5-10 mm;

anthers to 6 mm.

= 28.

= 42, 56.