Flora of North America species comparison

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.

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.

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.

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.

2-20 cm;

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

pedicels 0.5-4 mm.

18-60 cm, open;

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

pedicels 3-10 mm.

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.

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.

about 1 mm.

4.5-6 mm.

= 42.

= 64.