Flora of North America species comparison

30-120 cm tall, 2-4 mm thick, erect or decumbent.

65-120(150) cm, erect;

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

internodes pubescent or glabrous.

usually densely, often retrorsely, hairy, hairs sometimes confined to the throat;

auricles absent;

ligules 1-4 mm, glabrous or pilose, obtuse, lacerate to erose;

blades 4-30 cm long, 3-10 mm wide, flat, glabrous or hairy on both surfaces.

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.

9-28 cm, usually open, erect or nodding;

lower branches shorter than 10 cm, 1-4 per node, spreading or ascending, with up to 5 spikelets variously distributed.

10-25 cm, open, usually nodding;

branches usually spreading, sometimes ascending, often drooping.

(17)20-40 mm, shorter than at least some pedicels and branches, elliptic to lanceolate, strongly laterally compressed, not crowded or overlapping, with 4-12 florets.

(13)15-30 mm, elliptic to lanceolate, terete to moderately laterally compressed, with (4)5-10(13) florets.

smooth or scabrous, glabrous or pubescent;

lower glumes 7-12 mm, 5-7(9)-veined;

upper glumes 9-17 mm, 7-9(11)-veined, shorter than the lowest lemma;

lemmas 11-20 mm, lanceolate, laterally compressed, strongly keeled, usually glabrous, sometimes pubescent distally, smooth or scabrous, 9-13-veined, veins often raised and riblike, margins sometimes conspicuous, hyaline, whitish or partly purplish, apices entire or toothed, teeth acute, shorter than 1 mm;

awns absent or to 10 mm;

anthers 0.5-1 mm in cleistogamous florets, 2-5 mm in chasmogamous florets.

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.

= 42.

= 14.