Flora of North America species comparison

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

30-90 cm, erect or decumbent, forming distinct clumps;

nodes 2-3, glabrous or puberulent;

internodes glabrous or puberulent.

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.

glabrous or with hairs;

auricles to 1 mm on the lower leaves;

ligules 0.4-1.0 mm, glabrous or ciliate, truncate, erose;

blades 10-20 cm long, 2-3 mm wide, scabridulous, glabrous or sparsely pilose, margins sometimes ciliate.

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.

8-20 cm long, lax;

branches scabridulous, with 1-2 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.

20-32 mm, lanceolate, becoming cuneate, with 5-8 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.

glabrous, sometimes scabridulous on the veins;

lower glumes 6.5-10 mm, 1(3)-veined;

upper glumes 7.5-12 mm, 3-5-veined;

lemmas 10-13 mm, oblong to lanceolate, rounded over the midvein, 7-veined, glabrous or appressed-hairy, sometimes scabridulous, apices acute, entire or minutely bifid;

awns 4-8 mm, straight or slightly spreading, arising less than 1.5 mm below the lemma apices;

anthers 2.5-5.2 mm.

= 42.

= 70.