Flora of North America species comparison

30-60 cm, slender.

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

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

internodes usually glabrous.

pilose-pubescent to nearly glabrous;

blades 7-28 cm long, 2-9 mm wide, pilose or glabrous.

10-20 cm long, 3-9 cm wide, erect, dense;

branches appressed to spreading, sometimes flexuous.

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

branches ascending to spreading or drooping, filiform.

15-20 mm, elliptic to lanceolate, more or less terete, with 3-9 florets.

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

glabrous, acuminate;

lower glumes 8-10 mm, 1-veined;

upper glumes 12-16 mm, 3(5)-veined;

lemmas 11-14 mm, lanceolate to linear-lanceolate, sparsely pubescent, 5-veined, rounded over the midvein, apices acuminate, bifid, teeth 2-3 mm, usually aristate, sometimes acuminate;

awns 13-20 mm, geniculate, strongly to moderately twisted in the basal portion, arising 1.5 mm or more below the lemma apices;

anthers 2-2.5 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.

= unknown.

= 28.