Flora of North America species comparison

30-140 cm tall, 1-1.8 mm thick, erect or geniculate, internodes glabrous;

nodes usually 2-4, exposed, sericeous, hairs to 1.2 mm.

35-100 cm tall, 1.8-3.1 mm thick, erect or geniculate at the lowest nodes, sometimes scabrous below the panicles, internodes mostly glabrous, lower internodes sometimes pubescent below the nodes;

nodes 2-3, pubescent.

glabrous or slightly hispid, basal leaf sheaths often with cleistogenes;

collars glabrous, often brown or purple-tinged, with tufts of hair at the sides, hairs 0.5-1.2 mm;

Iigules 1-4 mm, glabrous or pubescent, truncate;

blades to 30 cm long, 2-8 mm wide, flat to convolute, sometimes scabrous, sometimes with hairs.

glabrous or hairy, sometimes mostly glabrous, sometimes the distal margins ciliate, varying within a plant;

collars with tufts of hair at the sides, hairs 0.5-0.8 mm;

ligules 0.3-1.2 mm, glabrous, truncate to rounded;

blades 10-20 cm long, 0.8-3.5 mm wide, flat to convolute, abaxial surfaces glabrous or sparsely pilose.

18-60 cm, open;

branches 3-9 cm, spreading, flexuous, often pilose at the axils, with 2-6 spikelets;

pedicels 3-10 mm.

subequal, 10-22 mm long, 1.8-2.3 mm wide, narrowly lanceolate, glabrous, 3-5-veined;

florets 6-13 mm long, 1-1.5 mm wide, terete, widest just below the crown;

calluses 2-4.5 mm, sharp, strigose;

lemmas often purple, finely rugose-papillose, particularly near the crown, constricted below the crown, midveins pilose proximally, glabrous between the veins at maturity;

crowns 0.4-1.6 mm, usually wider than long, sides usually flaring somewhat distally, rims with hairs to 0.5 mm;

awns 50-120 mm, clearly twice-geniculate, terminal segment straight;

anthers 3-3.5 mm, penicillate.

subequal, 12-20 mm long, 1.1-2.2 mm wide, narrowly lanceolate, glabrous;

florets 7.5-11.5 mm long, about 1.2 mm thick, terete;

calluses 1.8-3.5 mm, sharp, strigose;

lemmas papillose, evenly pubescent at maturity, constricted below the crown;

crowns 0.6-1.1 mm long, 0.5-0.7 mm wide, straight-sided to slightly flared, rims with 0.8-0.9 mm hairs;

awns 38-100 mm long, 0.3-0.45 mm thick at the base, strongly twice-geniculate, terminal segment straight;

anthers 3.5-5.5 mm, penicillate.

3-5 mm.

4.5-6 mm.

panicles 5-40 cm, exserted, erect to nodding;

branches 2.5-8.5 cm, with 2-5 spikelets;

pedicels 1-8 mm, angled, scabrous, pubescent.

= 28.

= 64.