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.

20-60 cm tall, 1-2 mm thick, erect, not rooting at the lower nodes;

internodes mostly glabrous or sparsely hispidulous, always hispidulous 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 than the internodes, laterally compressed, keeled, smooth or scabridulous, not becoming spirally coiled when old;

ligules 0.2-0.8 mm, membranous, truncate;

blades 2-22 cm long, 0.5-2.7(3.5) mm wide, flat to folded, smooth or scabridulous abaxially, strigose 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.

4-14 cm long, 0.1-0.8 cm wide, spikelike, not dense;

primary branches 0.4-3 cm, appressed;

pedicels 0.1-1.2(4) mm.

1.8-2.8 mm, borne singly.

2.5-3.6 mm, dark green or plumbeous, occasionally with 2 florets.

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, 1.2-3 mm, about 3/4 as long as the spikelets, 1-veined, gradually acute to acuminate, occasionally mucronate, mucros to 0.3 mm;

lemmas 2.5-3.6 mm, lanceolate, sometimes mottled with greenish-black areas, with short, appressed hairs on the basal 1/2 - 3/4 of the midveins and margins, apices acuminate, sometimes mucronate, mucros to 0.6 mm;

paleas 2.4-3.6 mm, lanceolate, glabrous, acuminate;

anthers 1.2-1.8 mm, greenish.

1-1.4 mm, fusiform, brownish.

1.6-2.3 mm, fusiform, brownish.

= 40, 42.

= 20.