Flora of North America species comparison

40-210 cm;

internodes glaucous or not;

branches erect to ascending, usually straight, sometimes arching.

50-100(150) cm;

internodes green, sometimes somewhat glaucous just below the node;

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.

not scabrous;

ligules 0.2-0.6 mm, ciliate, cilia 0.3-0.6 mm;

blades 11-50 cm long, 2-5.5 mm wide, sparsely to densely pubescent, most hairs appressed.

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.

7-97 (usually about 45) per culm; subtending sheaths (2.5)3-4.5(6) cm long, (2.5)3.2-4.1(5.5) mm wide;

peduncles (1)3-4(13) mm, with 2(3) rames;

rames (1.3)1.8-2.6(4) cm, not 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 (3.5)4.1-4.5(5) mm;

callus hairs 1.5-5 mm;

keels of lower glumes scabrous only above the midpoint;

awns 10-21 mm;

anthers 1, 0.9-1.6 mm, yellow.

spikelets vestigial to absent.

spikelets vestigial or absent.

= 20.

= 20.