Flora of North America species comparison

30-120 cm, erect, unbranched.

70-100 cm, erect, mostly unbranched.

basal and cauline, pale green, sometimes glaucous;

sheaths longer or shorter than the internodes, glabrous except at the summit;

collars densely to sparsely pilose or glabrous;

ligules less than 0.5 mm;

blades 8-30 cm long, 1-2 mm wide, usually flat, often curled at maturity.

cauline;

sheaths mostly longer than the internodes, mostly glabrous, summit with hairs;

collars mostly glabrous, sides usually with straight or wrinkled hairs;

ligules 0.2-0.3 mm;

blades 30-55 cm long, 1-2 mm wide, pale yellow-green, loosely involute, lax, glabrous abaxially, with scattered hairs adaxially.

paniculate, 10-30 cm long, (4)8-26 cm wide;

rachis nodes with straight hairs, hairs to 0.8 mm;

primary branches 6-16 cm, abruptly spreading to divaricate, stiff to lax, with axillary pulvini, usually not spikelet-bearing below midlength.

paniculate, 30-45 cm long, 5-25 cm wide, oblong to ovate;

primary branches single or paired, ascending and somewhat lax to stiffly divergent, with weakly developed axillary pulvini, spikelet-bearing to the base;

lowermost branches to 15 cm.

appressed, rarely spreading.

mostly appressed.

1(3)-veined, brown or purple at maturity, acuminate;

lower glumes 6-13 mm;

upper glumes equaling or to 4 mm shorter than the lower glumes;

calluses 0.8-1.2 mm;

lemmas 10-15(17) mm, terminating in a strongly twisted, 2-4 mm awnlike beak, junction with the awns not conspicuous;

awns not disarticulating at maturity;

central awns 5-12 mm, markedly bent near the base;

lateral awns absent or to 1(3) mm, erect;

anthers 1.2-2.2 mm, brownish.

purplish-tinged, 1-veined;

lower glumes 10-14 mm;

upper glumes 8-9 mm;

calluses 0.5-0.7 mm;

lemmas 8-12 mm, gray mottled with purple or dark patches, narrowing to a slightly curved and twisted beak, junction with the awns not strongly marked;

awns not disarticulating at maturity;

central awns 10-25 mm, falcate;

lateral awns absent;

anthers 3, about 1 mm, brown.

6-8 mm.

6-7 mm, chestnut-colored.

= 22, 44.

= unknown.