Flora of North America species comparison

40-210 cm;

internodes glaucous or not;

branches erect to ascending, usually straight, sometimes arching.

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

usually smooth, rarely somewhat scabrous;

ligules 0.2-1 mm, ciliate, cilia 0.2-1.3 mm;

blades 11-52 cm long, 1.7-6.5 mm wide, smooth and glabrous or sparsely to densely pubescent with spreading hairs.

6-195 per culm; subtending sheaths (2.1)3.1-4.6(6.7) cm long, (1.7)3-3.8(5.6) mm wide;

peduncles usually (1)4-6(30) mm, with 2-7 rames;

rames (0.5)1.7-2.8(4.4) cm, sometimes exerted at maturity, pubescence sparse basally and increasing in density 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 (2.6)3.5-3.8(4.7) mm;

callus hairs 1-3 mm;

keels of lower glume usually smooth below midlength, scabrous distally;

awns 6-21 mm;

anthers 1(3), 0.6-1.5 mm, yellow or purple.

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 to 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.