Flora of North America species comparison

(50)60-100(105) cm, unbranched, usually smooth, rarely slightly scabrous beneath the panicles;

nodes (1)2-3(4).

15-50(54) cm, unbranched, usually scabrous, rarely smooth;

nodes 1-2.

smooth or slightly scabrous;

collars often hairy, rarely glabrous;

ligules (2)3-5(6) mm, truncate to obtuse, often lacerate;

blades (6)8-40(42) cm long, (1)2-5(8) mm wide, usually flat, abaxial surfaces smooth or slightly scabrous, adaxial surfaces smooth or scabrous, glabrous or sparsely hairy.

and collars smooth or slightly scabrous;

ligules (1)2-3 mm, obtuse to acute, more or less lacerate;

blades (5)8-19(23) cm long, (1)2-3(4) mm wide, usually involute, seldom reaching the panicles, abaxial surfaces scabrous, adaxial surfaces usually scabrous, rarely smooth, glabrous or sparsely hairy.

(5)6-15(25) cm long, (0.7)1.5-2(2.7) cm wide, contracted to somewhat open, erect, usually greenish, infrequently purplish;

branches (1.2)2-4(10) cm, usually slightly scabrous, rarely densely long-scabrous, spikelet-bearing to the base.

4-9(14) cm long, (0.7)1-2(3.5) cm wide, erect, contracted and not or only slightly interrupted, yellowish green with a light purple tinge;

branches 1.3-3(3.7) cm, sparsely short-scabrous to densely long-scabrous, spikelet-bearing to the base.

(3)4-4.5(5.5) mm;

rachilla prolongations 0.6-1.5(2) mm, hairs 1.2-2 mm.

(3)3.5-4.5(7) mm;

rachilla prolongations about 1 mm, densely bearded, hairs to 2 mm.

rounded to slightly keeled, mostly smooth, keels rarely slightly scabrous, lateral veins usually obscure, rarely prominent, apices acute;

callus hairs (0.5)1-1.5(2.5) mm, 0.2-0.5(0.7) times as long as the lemmas, sparse;

lemmas 2.5-3.5(4) mm, (0.5)1-2 mm shorter than the glumes;

awns 2.8-3.5(4.5) mm, usually attached to the lower 1/5 of the lemmas, rarely higher, exserted, stout and readily distinguished from the callus hairs, strongly bent;

anthers (1)1.3-2(2.6) mm.

keeled, smooth or scabrous throughout, lateral veins usually somewhat obscure, rarely prominent, apices acute to acuminate, rarely awn-tipped;

callus hairs (1)1.5-2(2.5) mm, 0.4-0.8 times as long as the lemmas, abundant;

lemmas (2.5)3-3.5(5.5) mm, 0.5-1(2) mm shorter than the glumes;

awns (1)2-3(4) mm, usually attached to the lower 1/10 – 2/5 of the lemmas, rarely above the middle, sometimes slightly exserted, stout, distinguishable from the callus hairs, slightly bent;

anthers (1.1)1.8-2.4(3) mm.

= 28, 42, 56.

= 28.