Flora of North America species comparison

30-100 cm, erect;

nodes (2)3-4(5), glabrous or pubescent;

internodes mostly glabrous, puberulent near the nodes.

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

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

auricles absent;

ligules to 2.5 mm, glabrous, truncate or obtuse, erose or lacerate;

blades (3)10-25(35) cm long, 2-5(6) mm wide, flat, not glaucous, both surfaces usually glabrous, sometimes the adaxial surface 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.

7-20 cm, open, nodding, often 1-sided;

branches slender, ascending to spreading, often recurved and flexuous.

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.

12-38 mm, elliptic to lanceolate, terete to moderately laterally compressed, with (3)5-11(13) florets.

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

usually pubescent, rarely glabrous;

lower glumes 5-7(9) mm, usually 3-veined, sometimes 1-veined;

upper glumes 6-10 mm, 3-veined, not mucronate;

lemmas 8-14 mm, elliptic, rounded over the midvein, usually pubescent or pilose, margins often with longer hairs, backs and margins rarely glabrous, apices acute or obtuse to truncate, entire;

awns (1)2-3(3.5) mm, straight, arising less than 1.5 mm below the lemma apices;

anthers (1)2-3 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.

= 14.

= 42, 56.