Flora of North America species comparison

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

nodes 1-3(4).

(30) 55-80(100) cm, unbranched, scabrous beneath the panicles;

nodes (1)2(5).

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 usually scabrous, rarely smooth;

ligules (0.5)2-5.5(7) mm, usually truncate, entire to slightly lacerate;

blades (8)10-20(27) cm long, (1.5)2-3(4) mm wide, usually involute, abaxial surfaces usually scabrous, rarely smooth, adaxial surfaces scabrous, glabrous or sparsely hairy, both surfaces with abundant white glands between the veins, visible only with magnification.

(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.

(6)8-11(15) cm long, (1)1.2-1.5 cm wide, contracted, mostly erect, pale green to green;

branches 2-4(4.5) cm, scabridulous, usually spikelet-bearing to the base.

2-4(5) mm;

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

(4.5)5-7(8) mm;

rachilla prolongations about 1.5 mm, hairs 1-2 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, usually scabrous over the entire surface, rarely only the keels scabrous distally, lateral veins prominent, apices acute to acuminate;

callus hairs 1-1.5(2) mm, 0.2-0.4 times as long as the lemmas, sparse;

lemmas 4.5-6.5 mm, 0-2 mm shorter than the glumes;

awns 5-6(8) mm, attached to the lower 1/10 – 1/5 of the lemmas, exserted less than 2 mm, stout, distinguishable from the callus hairs, bent;

anthers (2.5)3-3.5(4) mm.

= 28.