Flora of North America species comparison

1-3 m, often glaucous.

30-100 (140) cm;

internodes usually 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 0.3-1.5 mm, sometimes ciliate, cilia to 0.7 mm;

blades 6-48 cm long, 0.8-5 mm wide, glabrous or densely 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.

2-31 per culm; subtending sheaths (2.6)4.1-4.5(13.5) cm long, (1.5)2.7-4.7(8) mm wide;

peduncles (1)5-31(195) mm, with 2-5 rames;

rames (1.5)2.8-4.2(6) cm, exserted or not 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 (3)3.9-4.7(5.7) mm;

callus hairs 1-5 mm;

keels of lower glumes scabrous only beyond midlength;

awns 8-24 mm;

anthers 1, 0.6-1.4(1.7) mm, yellow or purple.

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

spikelets vestigial or absent.

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

= 20.