Flora of North America species comparison

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

50-110(145) cm, erect to spreading;

nodes (3)4-5(6), usually glabrous, sometimes pubescent;

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.

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.

10-20(25) cm, open, nodding;

branches ascending to spreading or drooping, filiform.

(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(40) mm, elliptic to lanceolate, terete to moderately laterally compressed, with (4)6-10(15) 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 glabrous, sometimes pubescent;

lower glumes 7.5-12.5 mm, 1(3)-veined;

upper glumes 8.9-11.3 mm, 3-veined, often mucronate;

lemmas 9-14(16) mm, elliptic, rounded over the midvein, margins more or less densely pilose on the lower 1/2 or 3/4, lower lemmas in a spikelet glabrous across the backs, uppermost lemmas with appressed hairs on the backs, apices obtuse, entire;

awns (2)3-5 mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 1.6-2.7 mm.

sheaths often retrorsely pilose;

culm sheaths glabrous, often tufted-pilose near the auricle position, midrib of the culm leaves not abruptly narrowed just below the collar;

auricles absent;

ligules 0.4-2 mm, glabrous, rounded, erose, ciliolate;

blades 10-35 cm long, 3-12 mm wide, flat, glabrous.

= 42.

= 28.