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.

40-80 cm tall, 1.5-2.5 mm thick, erect, internodes glabrous;

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;

collars mostly glabrous, with tufts of hair at the sides, hairs 0.5-1 mm;

ligules 0.1-0.3 mm, glabrous, truncate;

blades 12-25 cm long, 1.5-2.5 mm wide, flat to convolute, pubescent.

2-20 cm;

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

pedicels 0.5-4 mm.

10-20 cm, open;

branches 1-3 cm, ascending to somewhat spreading, scabridulous, with 1-8 spikelets;

pedicels 1-8 mm, pubescent.

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, 10-15 mm long, 1.5-2 mm wide, narrowly lanceolate, 3-veined, keeled, keels scabrous;

florets 6-8 mm long, 0.9-1.1 mm wide, terete, widest near or slightly above midlength;

calluses 1.5-2.5 mm, sharp, strigose;

lemmas papillose-tuberculate, constricted and purplish below the crown, midveins and exposed marginal veins pubescent over the proximal 2/3, glabrous between the veins at maturity;

crowns about 1 mm long, about 0.5 mm wide, conspicuous, more or less straight-sided, purple, rims with 1-1.5 mm hairs;

awns 30-50 mm, clearly twice-geniculate, terminal segment straight;

anthers 3-4 mm in putatively chasmogamous florets, 0.3-0.5 mm in cleistogamous florets, both ranges sometimes present within a panicle.

about 1 mm.

about 3 mm.

= 42.

= unknown.