Flora of North America species comparison

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

50-110 cm, 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.

usually densely retrorsely pilose, sometimes densely villous generally or only on the throat: ligules 1-3.5 mm, glabrous, obtuse, lacerate to erose;

blades 10-30 cm long, 3-5 mm wide, 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.

10-28 cm, lax, usually open;

lower branches 2-3 per node, stiffly spreading to ascending, with 2-5 spikelets.

(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.

20-40 mm, with 4-6(8) 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.

glumes 5-7(9)-veined;

upper glumes 10-17 mm, 7-9-veined;

lemmas 11-16 mm, scabrous, glabrous or pubescent, 9-11-veined;

awns (5)6-10 mm;

anthers 0.6-1 mm in cleistogamous florets, 3-5 mm in chasmogamous florets.

= 42.

= 42.