Flora of North America species comparison

30-60 cm, slender.

40-190 cm, erect;

nodes 2-4, usually pubescent;

internodes usually pubescent.

pilose-pubescent to nearly glabrous;

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

with long, stiff, retrorse hairs, at least on the lower portion, midrib of the culm leaves not abruptly narrowed just below the collar;

auricles present;

ligules 2-3.5 mm, glabrous or sparsely pilose, rounded to truncate, erose;

blades 10-60 cm long, 6-15 mm wide, flat, drooping, glabrous or sparsely hairy.

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

branches appressed to spreading, sometimes flexuous.

15-40 cm long, open, lax, drooping;

branches spreading or drooping.

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, with 3-10 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, scabridulous over the veins;

lower glumes 5-8 mm, 1-veined;

upper glumes 8-11 mm, 3-veined, mucronate;

lemmas 10-14 mm, lanceolate, rounded over the midvein, margins and at least the lower 1/2 of the backs pubescent, apices acute, entire or emarginate, lobes shorter than 1 mm;

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

anthers 2.5-4 mm.

= unknown.

= 14, 28, 42.