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.

30-70 cm, erect or spreading;

nodes 3-5, pubescent.

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 pubescent to pilose;

auricles absent;

ligules 2-3 mm, lanceolate, pubescent, obtuse, erose;

blades 7-20 cm long, 3-7 mm wide, flat, usually pubescent to pilose, rarely glabrous.

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

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

8-15 cm, open, drooping;

branches ascending to spreading.

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

20-30 mm, elliptic to lanceolate, terete to moderately laterally compressed, with 4-7 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 or hispidulous;

lower glumes 6-9 mm, 1-veined;

upper glumes 8-10.5 mm, 3-veined, usually acute, rarely mucronate;

lemmas 9-15 mm, lanceolate, rounded over the midvein, glabrous, sometimes scabrous, apices subulate to acute, entire;

awns 4-8 mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 3-5 mm.

= 14.

= 28.