Flora of North America species comparison

60-170 cm, erect;

nodes (5)6-8, pubescent;

internodes usually glabrous, sometimes pubescent near the nodes.

45-120(150) cm, erect;

nodes (3)4-7(8), all pubescent or the lower nodes sometimes glabrous;

internodes glabrous.

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.

10-25 cm, open, nodding;

branches ascending, spreading, or drooping.

10-20 cm, open, nodding;

branches ascending, spreading, or drooping.

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

15-25 mm, elliptic to lanceolate, terete to moderately laterally compressed, with 4-9 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;

lower glumes 5.5-7.5 mm, 1(3)-veined;

upper glumes 7.1-8.5 mm, 3-veined, not mucronate;

lemmas 9.5-14 mm, elliptic to lanceolate, rounded over the midvein, backs glabrous, sometimes scabrous, margins conspicuously hirsute on the lower 1/2 - 2/3, apices obtuse to acute, entire;

awns 3-5 mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 1-1.4 mm.

sheaths usually retrorsely pilose, sometimes glabrous;

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

auricles sometimes present;

ligules 0.4-1.4 mm, usually glabrous, rarely pilose, truncate, erose;

blades 13-25 cm long, 4-10 mm wide, flat, abaxial surfaces usually glabrous, sometimes pilose, adaxial surfaces usually pilose, sometimes glabrous.

= 28.

= 14.