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.

34-70 cm, erect or ascending, glabrous or puberulent below the panicle.

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.

densely short-pubescent or glabrous;

auricles absent;

ligules 1.5-2 mm, glabrous, obtuse, erose;

blades 4-20 cm long, 1-5 mm wide, flat, both surfaces pubescent or glabrous.

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

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

3-15 cm long, 2-6 cm wide, open, erect;

branches (at least some) 1-3+ cm, ascending to spreading, never drooping, usually visible, with 1 or 2 spikelets.

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

30-50 mm, longer than the panicle branches, not densely crowded, with parallel sides or widening distally, moderately laterally compressed, with 6-10 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.

pilose, margins hyaline;

lower glumes 5-10 mm, 1-veined;

upper glumes 10-15 mm, 3-veined;

lemmas 12-20 mm, linear-lanceolate, often arcuate, pubescent, with longer hairs near the margins, 5-7-veined, rounded over the midvein, margins hyaline, apices acuminate, teeth 1.5-3 mm;

awns 12-23 mm, straight or arcuate, arising 1.5 mm or more below the lemma apices;

anthers 0.5-1 mm.

= 14.

= 28.