Flora of North America species comparison

40-210 cm;

internodes glaucous or not;

branches erect to ascending, usually straight, sometimes arching.

20-60 cm, wiry, glabrous.

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 to 1.4 mm;

blades to 45 cm long, to 4 mm wide, involute and filiform, or folded.

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.

3-50+ per culm;

peduncles 2-13.2 cm, with 1 rame;

rames 2-4 cm, usually long-exserted at maturity;

internodes densely pubescent, hairs to 8 mm.

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 4-6 mm;

lower glumes scabrous in the distal 1/2;

awns 11-20 mm.

spikelets vestigial to absent.

spikelets reduced to an awned or unawned glume, sterile.

= 20.

= 40.