Flora of North America species comparison

60-170 cm, erect;

nodes (5)6-8, pubescent;

internodes usually glabrous, sometimes pubescent near the nodes.

10-40 cm, erect or ascending.

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

auricles absent;

ligules 2-4 mm, glabrous, truncate, erose or lacerate;

blades 20-35(37) mm long, 6-16 mm wide, flat, abaxial surfaces glabrous, adaxial surfaces pilose.

10-25 cm, open, nodding;

branches ascending, spreading, or drooping.

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

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

20-30 mm, elliptic to lanceolate, terete to moderately laterally compressed, with (4)6-10 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.

pubescent;

lower glumes 6-8.5 mm, 1(3)-veined;

upper glumes 8-11.5 mm, 3-veined, not mucronate;

lemmas 10-12 mm, lanceolate, rounded over the midvein, backs pubescent, margins more densely so, apices acute, entire;

awns 3.5-7 mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 2-4 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.

= 28.

= 14, 28.