Flora of North America species comparison

90-170 cm;

internodes occasionally somewhat glaucous just below the nodes;

branches straight, erect to ascending.

40-210 cm;

internodes glaucous or not;

branches erect to ascending, usually straight, sometimes arching.

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.

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.

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.

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.

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 (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 vestigial or absent.

spikelets vestigial to absent.

= 20.

= 20.