Flora of North America species comparison

10-45(70) cm, geniculate, often rooting at the lower nodes, glabrous or puberulent below the nodes;

internodes often smooth, shiny, glabrous.

60-140 cm, erect;

internodes puberulent or glabrous for most of their length, puberulent below the nodes.

shorter than the internodes, glabrous for most of their length, margins shortly (0.3-1.2 mm) pubescent distally, not becoming spirally coiled when old;

ligules 0.2-0.5 mm, truncate, erose, ciliate;

blades (1)3-10 cm long, 1-4.5 mm wide, flat, smooth or scabridulous.

shorter or longer than the internodes, smooth or scabridulous, tightly imbricate, yellowish-brown, basal sheaths laterally compressed, keeled, not becoming spirally coiled when old;

ligules 3-12 mm, firm and brown basally, membranous distally, acute;

blades 10-45 cm long, 1.6-5 mm wide, tightly folded, scabrous abaxially, hirsute adaxially.

3-15 cm long, 1-1.6 cm wide, contracted, often interrupted below;

branches 0.4-5.5 cm, appressed or diverging up to 30° from the rachises, spikelet-bearing to the base;

pedicels 0.1-4 mm, scabrous to hirsute;

disarticulation above the glumes.

18-40 cm long, 1.5-7 cm wide, loosely contracted to open, not dense;

branches 1-10 cm, ascending or diverging up to 60° from the rachises, stiff, naked basally;

pedicels 2-8 mm, hirtellous.

1.8-2.8 mm, borne singly.

3-4.2 mm, yellowish to purplish.

unequal, shorter than the florets, thin and membranous throughout, unawned;

lower glumes lacking or rudimentary, veinless, rounded and often erose;

upper glumes 0.1-0.3 mm, veinless;

lemmas 1.8-2.8 mm, oblong-elliptic, mostly scabrous, calluses hairy, hairs to 0.8 mm, veins greenish, lower 1/4 of the midveins with a few appressed hairs, apices acute to acuminate, awned, awns 1.5-5 mm, straight;

paleas 1.8-2.8 mm, oblong-elliptic, acute to acuminate;

anthers 0.2-0.5 mm, yellow.

subequal, 2-3 mm, exceeded by the florets, scabridulous or smooth, 1-veined, acute or obtuse, unawned;

lemmas 3-4.2 mm, lanceolate, glabrous or appressed-pubescent on the lower 1/4 of the margins, apices acute to obtuse, usually bifid and awned, teeth to 0.3 mm, awns 0.5-4 mm, straight;

paleas 3-4.2 mm, lanceolate, glabrous, acute to acuminate;

anthers 1-1.8 mm, purplish.

1-1.4 mm, fusiform, brownish.

not seen.

= 40, 42.

= 24.