Flora of North America species comparison

1-3 m, often glaucous.

70-150 cm.

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 or scabrous, sometimes pilose;

ligules 0.4-1.5 mm, ciliate;

blades 1-3 mm wide, pubescent or glabrous and glaucous.

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.

2-30+ per culm;

peduncles usually 5-20 mm, with (1)2 rames;

rames 3-4 cm, exerted at maturity, terminating in a sessile-pedicellate spikelet pair;

internodes sparsely to densely villous, hairs from as long as to twice as long as the sessile spikelets.

spikelets 5-11 mm, scabrous;

awns 8-25 mm;

anthers 3, 2.5-4.5 mm.

spikelets 4.5-8.4 mm;

callus hairs to 8 mm;

awns 10-25 mm;

anthers 3,1.2-2.3 mm.

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

spikelets 1.5-3.6 mm, sterile.

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

= 40, 60.