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.

5-60 cm, erect.

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.

pilose;

ligules 0.5-1 mm, hairy, obtuse;

blades 3-13 cm long, 2-4 mm wide.

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

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

2-10 cm long, 1.5-3 cm wide, erect, contracted or loose;

branches shorter than the spikelets, ascending, slightly curved or straight.

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

6-15 mm, lanceolate, shiny, terete to moderately laterally compressed;

florets 5-12, 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.

glabrous;

lower glumes 4-4.6 mm, 3-5-veined;

upper glumes 5.2-5.4 mm, 7-veined;

lemmas 4.5-6.5 mm long, 1.5-1.7 mm wide, elliptic, glabrous, distinctly 7-veined, rounded over the midvein, margins broadly hyaline, sharply angled, not inrolled at maturity, apices notched, notch at least 0.6 mm deep;

awns 2-6 mm, straight, arising from the base of the apical notch but less than 1.5 mm below the lemma apices;

anthers 0.5-2 mm.

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

= 14.

= 28.