Flora of North America species comparison

30-60 cm, slender.

50-130 cm, erect, single or a few together;

nodes (2)3-5(6), usually glabrous, rarely pubescent;

internodes usually glabrous, rarely pubescent.

pilose-pubescent to nearly glabrous;

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

usually glabrous, rarely pubescent or pilose;

auricles sometimes present;

ligules to 3 mm, glabrous, truncate, erose;

blades 11-35(42) cm long, 5-15 mm wide, flat, usually glabrous, rarely pubescent or pilose.

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

branches appressed to spreading, sometimes flexuous.

10-20 cm, open, erect;

branches ascending or spreading.

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

20-40 mm, elliptic to lanceolate, terete to moderately laterally compressed, sometimes purplish, with (5)8-10 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 (4)6-8(9) mm, 1(3)-veined;

upper glumes (5)7-10 mm, 3-veined;

lemmas 9-13 mm, elliptic to lanceolate, rounded over the midvein, usually glabrous and smooth, sometimes scabrous, margins sometimes sparsely puberulent, the basal part of the backs less frequently so, apices acute to obtuse, entire;

awns absent or to 3 mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 3.5-6 mm.

= unknown.

= 28, 56.