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.

30-100 cm tall, 0.4-0.7 mm thick, bases somewhat bulblike, erect, geniculate and often branching intra-vaginally at the lower cauline nodes, internodes glabrous;

nodes 5-8+, glabrous.

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.

mostly glabrous, throats sometimes ciliate;

collars sparsely hairy, with tufts of hair at the sides, hairs 0.5-1.3 mm;

ligules 0.2-0.3 mm, truncate, usually ciliate;

blades 3-10 cm long, 1-1.5 mm wide, strongly convolute, stiff, abaxial surfaces glabrous, adaxial surfaces with coarse hairs.

2-20 cm;

branches 0.4-1.2 cm, with 1-4 spikelets;

pedicels 0.5-4 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, 3-4.5 mm long, 1.1-1.6 mm wide, ovate, 3-veined, glabrous or puberulent, acuminate;

florets 1.6-2.2 mm long, 0.6-0.9 mm wide, obovate to oblong, terete, widest near the top;

calluses 0.2-0.3 mm, obtuse, glabrous;

lemmas glabrous, smooth, lustrous, transition to the crown not evident;

crowns about 0.1 mm long and wide, not differing in texture from the lemmas;

awns 7-10 mm, eccentric, rapidly deciduous;

anthers about 1 mm or 0.3-0.4 mm, florets with longer anthers presumably chasmogamous, those with shorter anthers presumably cleistogamous.

3-5 mm.

about 1 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.

= 42.