Flora of North America species comparison

50-120 cm;

internodes not glaucous;

branches mostly erect, straight.

20-250 cm;

internodes green, sometimes glaucous;

branches mostly erect, straight.

smooth;

ligules 0.2-0.5 mm, ciliate, cilia 0.2-0.8 mm;

blades 10-22 cm long, 1.2-2.6 mm wide, glabrous or sparsely pubescent, with spreading hairs.

usually scabrous, sometimes smooth;

ligules 0.6-2.2 mm, sometimes ciliate, cilia to 0.9 mm;

blades 13-109 cm long, 2.9-9.5 mm wide, glabrous or sparsely to densely pubescent, hairs usually spreading, rarely appressed.

3-11 per culm; subtending sheaths (2.8)4.1-5.8(7.2) cm long, (3)4-4.7(5.8) mm wide;

peduncles (9)14-31(65) mm, with 2 rames;

rames (1.5)2.4-3.6(4.2) cm, usually exserted at maturity, pubescence increasing in density distally within each internode.

10-600 per culm; subtending sheaths (2.0)2.9-4.4(6.5) cm long, (1.5)2.3-3.4(4.4) mm wide;

peduncles (1)6-14(60) mm, with 2(4) rames;

rames (1)1.7-2.5(3.5) cm, exserted or not at maturity, pubescence sparse basally and increasing in density distally within each internode.

spikelets (4)4.8-5(5.5) mm;

callus hairs 1.5-3.5 mm;

keels of lower glumes scabrous only above the midpoint;

awns 11-23 mm;

anthers 1, 1.2-2 mm, yellow.

spikelets 3-5 mm;

callus hairs 1-2.5 mm;

keels of lower glumes sometimes scabrous below midlength, usually scabrous distally;

awns 6-19 mm;

anthers 1(3), 0.5-1.5 mm, yellow, red, or purple.

spikelets vestigial or absent.

spikelets vestigial or absent, sterile.

= 20.

= 20.