Flora of North America species comparison

30-100 cm, erect;

nodes (2)3-4(5), glabrous or pubescent;

internodes mostly glabrous, puberulent near the nodes.

(9)20-40 cm, erect or ascending.

glabrous or pilose, midrib of the culm leaves not abruptly narrowed just below the collar;

auricles absent;

ligules to 2.5 mm, glabrous, truncate or obtuse, erose or lacerate;

blades (3)10-25(35) cm long, 2-5(6) mm wide, flat, not glaucous, both surfaces usually glabrous, sometimes the adaxial surface pilose.

sparsely pubescent or glabrous;

ligules 0.8-1.5 mm, glabrous or hairy, obtuse;

blades 5-20 cm long, 2-5 mm wide, abaxial surfaces glabrous, adaxial surfaces pilose.

7-20 cm, open, nodding, often 1-sided;

branches slender, ascending to spreading, often recurved and flexuous.

2-7 cm long, 1-4 cm wide, erect, dense, obovoid, wedge-shaped at the base, sometimes interrupted;

branches shorter than the spikelets, erect, straight or almost so, sometimes verticillate.

12-38 mm, elliptic to lanceolate, terete to moderately laterally compressed, with (3)5-11(13) florets.

12-25 mm, lanceolate, crowded, terete to moderately laterally compressed;

florets 5-10, bases concealed at maturity;

rachilla internodes concealed at maturity.

usually pubescent, rarely glabrous;

lower glumes 5-7(9) mm, usually 3-veined, sometimes 1-veined;

upper glumes 6-10 mm, 3-veined, not mucronate;

lemmas 8-14 mm, elliptic, rounded over the midvein, usually pubescent or pilose, margins often with longer hairs, backs and margins rarely glabrous, apices acute or obtuse to truncate, entire;

awns (1)2-3(3.5) mm, straight, arising less than 1.5 mm below the lemma apices;

anthers (1)2-3 mm.

scabrous to pubescent;

lower glumes 3-4 mm, 3-5-veined;

upper glumes 5-7 mm, 5-7-veined;

lemmas 7-10 mm long, 1.5-2 mm wide, lanceolate, glabrous, obscurely 7-veined, rounded over the midvein, margins rounded, not inrolled at maturity, apices sharply acute, bifid, teeth shorter than 1 mm;

awns 7-10 mm, flattened at the base, divaricate or recurved when mature, arising 1.5 mm or more below the lemma apices;

anthers 0.3-0.5 mm.

shorter than the paleas, thin, weakly inrolled or flat.

= 14.

= 14.