Flora of North America species comparison

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

(60)70-140 cm, erect or spreading;

nodes 5-9, pubescent or glabrous, often concealed by the sheaths;

internodes usually 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.

usually retrorsely pilose, sometimes glabrous, with a dense line of hairs at the collar, lower sheaths often sericeous;

auricles absent;

ligules 0.4-1 mm, often hairy, truncate, erose, ciliolate;

blades 15-30 cm long, 5-12 mm wide, often shiny yellow-green, flat, abaxial surfaces pilose, adaxial surfaces glabrous or pilose over the veins.

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.

9-25 cm, open, nodding;

branches ascending or spreading, often recurved.

(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.

18-30 mm, elliptic to lanceolate, terete to moderately laterally compressed, often purplish, with 6-12 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;

lower glumes 5.5-8 mm, 1(3)-veined;

upper glumes 7-10 mm, 5-veined, often mucronate;

lemmas 8-13 mm, elliptic to lanceolate, rounded over the midvein, usually uniformly densely hairy, or the backs less densely so, apices acute to obtuse, entire;

awns 5-8 mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 2.8-3.5(5) mm.

= 42.

= 14.