Flora of North America species comparison

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

80-150 cm, erect;

nodes 9-20, glabrous, usually concealed by the leaf sheaths;

internodes usually glabrous, sometimes hairy just below the nodes.

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.

overlapping, densely to moderately retrorsely pilose or glabrous over most of their surface, throats and collars densely pilose;

auricles 1-2.5 mm on most lower leaves;

ligules 0.8-1.4 mm, hirsute, ciliate, truncate, erose;

blades 20-30 cm long, 5-15 mm wide, flat, usually glabrous, rarely pilose, with 2 prominent flanges at the collar.

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.

10-22 cm, open, nodding;

branches spreading to ascending.

(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.

15-30 mm, elliptic to lanceolate, terete to moderately laterally compressed, with 4-9 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.

pubescent or glabrous;

lower glumes 4-7.5 mm, 1(3)-veined;

upper glumes 6-9 mm, 3-veined, sometimes mucronate;

lemmas 8-14 mm, elliptic to lanceolate, rounded over the midvein, backs glabrous or pilose to pubescent, margins long-pilose, apices obtuse to acute, entire;

awns 3-4.5(7) mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 2-3 mm.

= 42.

= 14.