Flora of North America species comparison

30-60 cm, slender.

45-120(150) cm, erect;

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

internodes 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 cm, open, nodding;

branches ascending, spreading, or drooping.

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

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

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.

= unknown.

= 14.