Flora of North America species comparison

25-100 cm tall, 0.4-0.7(1.1) mm thick, usually erect, basal nodes sometimes geniculate, internodes mostly glabrous, pubescent just below the lower nodes;

nodes 2-4, glabrous.

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.

glabrous, even on the margins, sometimes scabridulous;

collars glabrous, without tufts of hair at the sides;

ligules 1-5 mm, glabrous, acute;

blades 7-60 cm long, 0.2-1.5 mm wide, usually convolute, stiff, glabrous, scabridulous.

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.

8-50 cm, loosely contracted, often partly enclosed at maturity;

branches 2-8 cm, glabrous;

pedicels 1-11 mm.

subequal, 5-13 mm long, 0.5-1.2 mm wide, narrowly lanceolate, glabrous, aristate;

florets (1.5)2.5-3 mm long, about 0.5 mm wide, widest at about midlength, somewhat laterally compressed;

calluses 0.2-0.5 mm, blunt, strigose, hairs reaching to about 1/4 - 1/3 the length of the lemmas;

lemmas finely tuberculate, rounded to the crown, midveins pubescent on the proximal 1/2;

crowns 0.1-0.2 mm long, 0.2-0.25 mm wide, straight-sided, rims with hairs shorter than 0.5 mm;

awns 45-100 mm, almost centric, cernuous throughout, twice-geniculate, usually both geniculations obscure;

anthers 3, 1.2-1.5 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.

about 2 mm, linear, dark brown.

3-5 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.

= 40.

= 28.