Flora of North America species comparison

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

50-100(110) cm, usually erect, sometimes decumbent at the base;

nodes 3-5, pubescent, puberulent, or glabrous;

internodes puberulent 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.

and throats pilose or glabrous;

auricles absent;

ligules 0.5-1 mm, glabrous, truncate, erose;

blades 10-17 cm long, 5-10 mm wide, flat, with prow-shaped tips, both surfaces glabrous or pilose or only the adaxial surfaces pilose.

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.

8-13 cm, open, drooping;

branches ascending to spreading, flexuous.

(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.

15-25 mm, elliptic to lanceolate, terete to moderately laterally compressed, with 7-11 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.

pubescent, margins often hyaline;

lower glumes 5-7.5 mm, 3-veined;

upper glumes 6.5-8.5 mm, 5-veined;

lemmas 7-11 mm, elliptic to lanceolate, rounded over the midvein, backs more or less uniformly pilose or pubescent, margins densely long-pilose, apices acute to obtuse, entire;

awns 1.5-3 mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 1.5-2.5 mm.

= 42.

= 14.