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.

30-70 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.

often densely hairy with soft, white hairs;

ligules 1-2 mm, hairy, obtuse, erose;

blades 10-30 cm long, 3-5 mm wide, glabrous or pubescent.

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

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

5-15 cm long, 2-9 cm wide, erect, densely contracted when immature, more open with age;

branches usually shorter than the spikelets, rigid, ascending to slightly spreading, slightly curved or straight.

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

20-50 mm, lanceolate, terete to moderately laterally compressed, often 2+ per node;

florets 7-20, 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.

pilose;

lower glumes 5-9 mm, 3-5-veined: upper glumes 8-12 mm, 5-7-veined;

lemmas 11-20 mm long, 1.8-2.5 mm wide, lanceolate, pilose, obscurely 7-veined, rounded over the midvein, margins rounded, not inrolled at maturity, apices acute, bifid, teeth shorter than 1 mm;

awns 6-12 mm, to 20 mm on some distal lemmas, divaricate when mature, arising 1.5 mm or more below the lemma apices;

anthers 1-1.5 mm.

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

= 14.

= 28, 42.