Flora of North America species comparison

1-3 m, often glaucous.

60-250 cm;

internodes not glaucous.

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 0.6-1 mm;

blades 20-70 cm long, 2-7 mm wide, usually glabrous or scabrous on the margins.

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.

50-500; subtending sheaths 2.5-4.5 cm long, 2-3 mm wide;

peduncles 20-70 mm, with 2(3) rames;

rames 2-4 cm, exerted at maturity;

internodes filiform, densely and evenly pubescent, hairs 3-9 mm.

spikelets 5-11 mm, scabrous;

awns 8-25 mm;

anthers 3, 2.5-4.5 mm.

spikelets 3-4 mm; unawned;

callus hairs 0.5-1 mm;

keels of lower glumes scabrous above the midpoint;

anthers 3, 1-1.4 mm.

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

spikelets mostly vestigial or absent, 1-2 of those in the terminal units on each rame 3-5 mm and staminate.

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

= 60, 120.