Flora of North America species comparison

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

120-180 cm tall, 3-5 mm thick, erect.

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.

glabrous or sparsely pilose;

auricles absent;

ligules 3-4 mm, glabrous or hairy, obtuse, lacerate;

blades 20^40 cm long, 2-9 mm wide, flat, sparsely pilose adaxially or on both surfaces.

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.

25-35 cm, open;

lower branches to 20 cm, 2-4(6) per node, spreading, often drooping, with 1-3 spikelets on the distal 1/2 sometimes confined to the tips.

(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.

18-38 mm, elliptic to lanceolate, strongly laterally compressed, with (5)6-9 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.

glabrous, sometimes scabrous;

lower glumes 6-10 mm, 3-5-veined;

upper glumes 8-11 mm, 5-7-veined;

lemmas 12-14(15) mm, lanceolate, laterally compressed, 7-11-veined, strongly keeled at least distally, usually glabrous, sometimes hirtellous, margins sometimes sparsely pilose, apices entire or with acute teeth, teeth shorter than 1 mm;

awns 5-10 mm;

anthers to 6 mm.

= 42.

= 42, 56.