Flora of North America species comparison

(10)35-90(120) cm, usually unbranched, smooth to slightly scabrous;

nodes 1-3(4).

135-210 cm, smooth to slightly scabrous, usually unbranched;

nodes about 3.

usually smooth;

collars usually smooth, sometimes scabrous, rarely pubescent;

ligules (0.5)1-5.5(6) mm, truncate to obtuse, usually entire, sometimes lacerate;

blades (5)11-25(34) cm long, (1)1.5-5(6) mm wide, flat or involute, usually scabrous, rarely smooth, sometimes puberulent.

and collars smooth;

ligules (1)2-7 mm, lacerate;

blades (5)11-63(71) cm long, (1)1.5-7.5(8) mm wide, flat or involute, usually scabrous, rarely smooth, adaxial surfaces glabrous or sparsely hairy.

(2)4-18(29) cm long, (0.7)1-2(2.8) cm wide, erect, contracted, sometimes interrupted, pale green to purple;

branches 1.4-5(9.5) mm, smooth or scabrous, usually spikelet-bearing to or near the base, sometimes only to midlength.

15-30 cm long, 0.75-1(3) cm wide, erect, contracted, pale green to purple;

branches about 6 cm, slightly scabrous, longer branches with spikelets on the distal 2/3, shorter branches with spikelets to the base.

2-4(5) mm;

rachilla prolongations 0.5-1.5 mm, hairs 1.5-3 mm.

4-5 mm;

rachilla prolongations about 0.5 mm, hairs about 1.5 mm.

usually less than 3 times as long as wide, rounded or keeled, usually smooth, rarely scabrous, keels smooth or scabrous, veins prominent to obscure, apices acute;

callus hairs (1)1.5-3(4.5) mm, (0.5)0.7-0.9(1.3) times as long as the lemmas, abundant;

lemmas 2-4(5) mm, 0.1-1.5 mm shorter than the glumes;

awns 1.5-2.5 mm, usually attached to the lower 1/10-1/2 of the lemmas, rarely beyond the midpoint, equaling or exserted slightly beyond the margins of the glumes, usually stout, rarely slender, usually distinguishable from the callus hairs, straight or bent;

anthers (0.9)1.2-1.8(2.4) mm, often sterile.

keeled, mostly smooth, slightly scabrous only on the keels, veins usually obscure, apices acute;

callus hairs 2-2.5 mm, 0.4-0.6 times as long as the lemmas, abundant;

lemmas 3-3.5 mm, 1-1.5 mm shorter than the glumes;

awns about 3.5 mm, attached to the lower 1/10 – 1/5 of the lemmas, exserted, slender, usually distinguishable from the callus hairs, bent;

anthers not observed.