Flora of North America species comparison

90-170 cm;

internodes occasionally somewhat glaucous just below the nodes;

branches straight, erect to ascending.

(40)60-150(200) cm, strongly glaucous.

smooth, rarely somewhat scabrous;

ligules 0.3-0.9 mm, sometimes ciliate, cilia to 0.5 mm;

blades 15-35 cm long, 3-8 mm wide, glabrous or densely pubescent, hairs spreading.

5-45 per culm; subtending sheaths (3.3)3.8-6.8(9) cm long, (2.5)3.2-4(5) mm wide;

peduncles (9)26-66(115) mm, with 2(4) rames;

rames (2.2)2.6-4.3(5.3) cm, usually exserted at maturity, pubescence either evenly distributed or more dense distally within each internode.

usually only terminal;

peduncles with 2-7 rames;

rames 4-7(9) cm, exserted at maturity;

internodes usually densely pubescent, hairs 3.7-6.6 mm, often strongly yellowish.

spikelets (4.3)4.9-5.4(6.1) mm;

callus hairs 1.5-2.5 mm;

keels of lower glumes scabrous from below the midpoint;

awns 5-16 mm;

anthers 1(3), 2-3.5 mm, red.

spikelets (5)6.5-12 mm;

lower glumes often ciliate;

awns absent or to 11 mm;

anthers 3, (2.3)4-6 mm.

spikelets vestigial or absent.

spikelets 3.5-12 mm, usually well-developed and staminate.

(0.9)2.5-4.5 mm, ciliate;

blades 3-40(51) cm long, (1.5)2-10 mm wide, often pilose, at least near the collar.

= 20.

= 60 (usually), 70, 100.