Flora of North America species comparison

40-210 cm;

internodes glaucous or not;

branches erect to ascending, usually straight, sometimes arching.

30-100 (140) cm;

internodes usually glaucous;

branches mostly erect, straight.

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 0.3-1.5 mm, sometimes ciliate, cilia to 0.7 mm;

blades 6-48 cm long, 0.8-5 mm wide, glabrous or 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.

2-31 per culm; subtending sheaths (2.6)4.1-4.5(13.5) cm long, (1.5)2.7-4.7(8) mm wide;

peduncles (1)5-31(195) mm, with 2-5 rames;

rames (1.5)2.8-4.2(6) cm, exserted or not 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 (3)3.9-4.7(5.7) mm;

callus hairs 1-5 mm;

keels of lower glumes scabrous only beyond midlength;

awns 8-24 mm;

anthers 1, 0.6-1.4(1.7) mm, yellow or purple.

spikelets vestigial to absent.

spikelets vestigial or absent.

= 20.

= 20.