Flora of North America species comparison

60-170 cm, erect;

nodes (5)6-8, pubescent;

internodes usually glabrous, sometimes pubescent near the nodes.

65-120(150) cm, erect;

nodes (3)5-7(9), usually pubescent, sometimes glabrous;

internodes pubescent or 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.

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

auricles absent;

ligules 0.5-2 mm, glabrous, obtuse to truncate, erose;

blades 12-32 cm long, 6-15(19) mm wide, flat, 1 or both surfaces glabrous or hairy.

10-25 cm, open, nodding;

branches ascending, spreading, or drooping.

10-25 cm, open, usually nodding;

branches usually spreading, sometimes ascending, often drooping.

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

(13)15-30 mm, elliptic to lanceolate, terete to moderately laterally compressed, with (4)5-10(13) 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.

usually pubescent, rarely glabrous;

lower glumes 4-8 mm, 1-veined;

upper glumes 5-10 mm, 3(5)-veined, not mucronate;

lemmas 8-12 mm, lanceolate, rounded over the midvein, backs and margins usually hairy, sometimes glabrous or scabrous, apices subulate to acute, entire;

awns (3)4-7(8) mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 2-4(5) mm.

= 28.

= 14.