Flora of North America species comparison

60-120 cm, erect or spreading;

nodes (3)4-6(7), usually pilose;

internodes glabrous.

50-110(145) cm, erect to spreading;

nodes (3)4-5(6), usually glabrous, sometimes pubescent;

internodes usually glabrous.

pilose or glabrous;

auricles absent;

ligules 2-6 mm, glabrous, obtuse or truncate, erose or lacerate;

blades 13-25(33) cm long, to 14 mm wide, flat, abaxial surfaces usually glabrous, sometimes pilose, adaxial surfaces usually pilose, sometimes glabrous.

10-15 cm, open;

branches ascending to drooping.

10-20(25) cm, open, nodding;

branches ascending to spreading or drooping, filiform.

15-30 mm, elliptic to lanceolate, terete to moderately laterally compressed, with (3)4-9 florets.

15-25(40) mm, elliptic to lanceolate, terete to moderately laterally compressed, with (4)6-10(15) florets.

glabrous or pilose;

lower glumes 5-8 mm, 1(3)-veined;

upper glumes 8-12 mm, 3-veined;

lemmas 8-15 mm, lanceolate, rounded over the midvein, backs sparsely hairy or glabrous, margins usually coarsely pubescent, sometimes glabrous, apices subulate to acute, entire;

awns (4)6-12 mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 2-4 mm.

usually glabrous, sometimes pubescent;

lower glumes 7.5-12.5 mm, 1(3)-veined;

upper glumes 8.9-11.3 mm, 3-veined, often mucronate;

lemmas 9-14(16) mm, elliptic, rounded over the midvein, margins more or less densely pilose on the lower 1/2 or 3/4, lower lemmas in a spikelet glabrous across the backs, uppermost lemmas with appressed hairs on the backs, apices obtuse, entire;

awns (2)3-5 mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 1.6-2.7 mm.

sheaths often retrorsely pilose;

culm sheaths glabrous, often tufted-pilose near the auricle position, midrib of the culm leaves not abruptly narrowed just below the collar;

auricles absent;

ligules 0.4-2 mm, glabrous, rounded, erose, ciliolate;

blades 10-35 cm long, 3-12 mm wide, flat, glabrous.

= 14.

= 28.