Flora of North America species comparison

40-210 cm;

internodes glaucous or not;

branches erect to ascending, usually straight, sometimes arching.

70-210 cm;

internodes occasionally somewhat glaucous just below the node;

branches straight, mostly erect to ascending.

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.

often scabrous, somteimes smooth;

ligules 0.4-1.2 mm, ciliate, cilia 0.2-1.3 mm;

blades 32-61 cm long, 2.9-5 mm wide, glabrous, rarely sparsely pubescent.

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.

(9)50-210 per culm; subtending sheaths (3)4-5.9(7) cm long, (1.5)2-2.7(3.6) mm wide;

peduncles (10)19-48(93) mm, with 2(4) rames;

rames (2)2.5-3.7(4.5) cm, usually exserted at maturity, internodes evenly pubescent.

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 (3.8)4.4-4.8(5.5) mm;

callus hairs 1-3 mm;

keels of lower glumes glabrous below midlength;

awns 5-15 mm;

anthers 1(3), 1.3-2 mm, usually yellow (sometimes purple).

spikelets vestigial to absent.

spikelets vestigial or absent.

= 20.

= 20.