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.

50-150 cm, stout, erect, not rooting at the lower nodes;

internodes mostly glabrous, sometimes 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, glabrous, basal sheaths laterally compressed, keeled, not becoming spirally coiled when old;

ligules 10-35 mm, firm and brown basally, membranous distally, acuminate;

blades 25-55 cm long, 2-5 mm wide, flat or folded, firm, scabridulous abaxially, scabrous and shortly pubescent 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.

15-50 cm long, 0.6-3 cm wide, often purplish-tinged;

primary branches 0.5-7 cm, appressed or strongly ascending, rarely spreading as much as 20° from the rachises;

pedicels 0.5-1.2 mm, scabrous.

1.8-2.8 mm, borne singly.

2.4-3.5 mm, light grayish.

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.

equal, 2-3.5 mm, shorter than or equal to the florets, scabrous or smooth, 1-veined, obtuse to acute, occasionally bifid and the teeth to 0.3 mm, unawned, rarely mucronate, mucros less than 0.2 mm;

lemmas 2.4-3.5 mm, lanceolate, scabrous or smooth, rarely puberulent near the base, apices obtuse to acute, unawned or awned, awns to 4 mm, straight;

paleas 2.4-3.5 mm, lanceolate, obtuse;

anthers 1.1-1.5 mm, purplish.

1-1.4 mm, fusiform, brownish.

1.2-1.6 mm, fusiform, reddish-brown.

= 40, 42.

= 20, 26.