Flora of North America species comparison

1.2-2.2 m;

internodes glaucous.

60-160 cm;

internodes not glaucous.

(1.3)2.3-3.1(4.7) mm wide, usually smooth;

ligules ciliate or not, cilia to 0.2 mm;

blades glaucous, glabrous, smooth.

(2)2.5-3.4(4.7) mm wide, scabrous;

ligules sometimes ciliate, cilia to 0.3 mm;

blades green, usually scabrous.

sheaths of inflorescence units usually 2-2.5 mm wide;

peduncles shorter than 10 mm;

rames usually shorter than 2 cm, not exerted at maturity.

sheaths of inflorescence units usually 2.5-3.4 mm wide;

peduncles (4)11-35(60) mm;

rames usually 2.1-2.9 cm, exerted.

of lower glumes usually scabrous beyond midlength.

of lower glumes usually smooth below midlength, scabrous distally;

anthers eventually deciduous.