Flora of North America species comparison

40-210 cm;

internodes glaucous or not;

branches erect to ascending, usually straight, sometimes arching.

1.1-3.1 m;

internodes not glaucous;

branches arching.

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.

smooth;

ligules 0.2-0.5 mm, ciliate, cilia 0.6-1.5 mm;

blades 21-54 cm long, 2.3-6 mm wide, glabrous or sparsely 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.

12-190 per culm; subtending sheaths (2.1)2.4-3.5(4.1) cm long, (2.3)2.6-3(3.8) mm wide;

peduncles (13)20-31(43) mm, with 2(3) rames;

rames (1.2)1.5-2.1(2.6) cm, usually exserted at maturity, pubescence increasing in density distally within each internode.

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 (4.1)4.4-4.6(5) mm;

callus hairs 1-1.5 mm;

keels of lower glumes scabrous only above the midpoint;

awns 2-11 mm;

anthers 1, 1.4-2.4 mm, red.

spikelets vestigial to absent.

spikelets vestigial or absent.

= 20.

= 20.