Flora of North America species comparison

20-250 cm;

internodes green, sometimes glaucous;

branches mostly erect, straight.

60-250 cm;

internodes not glaucous.

usually scabrous, sometimes smooth;

ligules 0.6-2.2 mm, sometimes ciliate, cilia to 0.9 mm;

blades 13-109 cm long, 2.9-9.5 mm wide, glabrous or sparsely to densely pubescent, hairs usually spreading, rarely appressed.

smooth;

ligules 0.6-1 mm;

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

10-600 per culm; subtending sheaths (2.0)2.9-4.4(6.5) cm long, (1.5)2.3-3.4(4.4) mm wide;

peduncles (1)6-14(60) mm, with 2(4) rames;

rames (1)1.7-2.5(3.5) cm, exserted or not at maturity, pubescence sparse basally and increasing in density distally within each internode.

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 3-5 mm;

callus hairs 1-2.5 mm;

keels of lower glumes sometimes scabrous below midlength, usually scabrous distally;

awns 6-19 mm;

anthers 1(3), 0.5-1.5 mm, yellow, red, or purple.

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 vestigial or absent, sterile.

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

= 20.

= 60, 120.