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.

10-40 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.

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

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

6-15 cm long, 1-2 cm wide, racemose, dense, strongly contracted, stiffly erect;

branches shorter than the spikelets, stiff, erect, straight.

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

17-45 mm long, 4-7 mm wide, narrowly oblong or lanceolate, terete to moderately laterally compressed, usually 1 per node;

florets (4)8-12, 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 or puberulent;

lower glumes 7-9 mm, 3-veined, upper glumes 8-11 mm, 5-7-veined;

lemmas 11-15(17) mm long, 3-5 mm wide, lanceolate, glabrous or pubescent, 9-veined, rounded over the midvein, margins bluntly angled, not inrolled at maturity, apices and teeth acuminate, teeth shorter than 1 mm;

awns 12-20 mm, strongly divaricate at maturity, flattened and often basally twisted, arising 1.5 mm or more below the lemma apices;

anthers 0.75-1.5 mm.

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

sheaths densely retrorsely villous-pubescent, upper sheaths glabrous;

ligules 0.5-1 mm, glabrous, truncate, dentate or lacerate;

blades 5-20 cm long, 1.5-4 mm wide, pilose, sparingly pubescent, or subglabrous.

= 14.

= 14, 28.