Flora of North America species comparison

1-3 m, often glaucous.

50-120 cm;

internodes not glaucous;

branches mostly erect, straight.

glabrous or pilose;

ligules 0.4-2.5 mm;

blades 5-50 cm long, (2)5-10 mm wide, usually pilose adaxially, at least near the collar.

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 only terminal;

peduncles with 2-6(10) rames;

rames 5-11 cm, exserted at maturity, usually purplish, sometimes yellowish;

internodes sparsely to densely pubescent, hairs 2.2-4.2 mm, usually white, rarely yellowish.

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.

spikelets 5-11 mm, scabrous;

awns 8-25 mm;

anthers 3, 2.5-4.5 mm.

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 3.5-12 mm, usually well-developed and staminate.

spikelets vestigial or absent.

= 20, 40, 60 (usually), 70, 80.

= 20.