Flora of North America species comparison

30-60 cm, slender.

65-120(150) cm, erect;

nodes (3)5-7(9), usually pubescent, sometimes glabrous;

internodes pubescent or glabrous.

pilose-pubescent to nearly glabrous;

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

retrorsely pilose, midrib of the culm leaves not abruptly narrowed just below the collar, collars hairy or glabrous;

auricles absent;

ligules 0.5-2 mm, glabrous, obtuse to truncate, erose;

blades 12-32 cm long, 6-15(19) mm wide, flat, 1 or both surfaces glabrous or hairy.

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

branches appressed to spreading, sometimes flexuous.

10-25 cm, open, usually nodding;

branches usually spreading, sometimes ascending, often drooping.

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

(13)15-30 mm, elliptic to lanceolate, terete to moderately laterally compressed, with (4)5-10(13) 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 pubescent, rarely glabrous;

lower glumes 4-8 mm, 1-veined;

upper glumes 5-10 mm, 3(5)-veined, not mucronate;

lemmas 8-12 mm, lanceolate, rounded over the midvein, backs and margins usually hairy, sometimes glabrous or scabrous, apices subulate to acute, entire;

awns (3)4-7(8) mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 2-4(5) mm.

= unknown.

= 14.