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.

15-40(50) cm tall, 0.8-1.5 mm thick, erect or decumbent;

internodes glabrous or strigulose for most of their length, including 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.

usually shorter than the internodes, smooth or scabridulous, without necrotic spots, not becoming spirally coiled when old;

ligules 0.5-2.5 mm, membranous, obtuse to acute, without lateral lobes;

blades 3-10 mm long, 0.5-2 mm wide, flat or involute (occasionally folded), smooth or scabridulous abaxially, hirsute or scabridulous adaxially, without necrotic spots.

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.

2-12 cm long, 0.3-1.8 cm wide, contracted, interrupted below;

primary branches 0.5-4 cm, appressed or diverging up to 30° from the rachises, spikelet-bearing to the base;

pedicels 0.1-1.5 mm, scabrous.

1.8-2.8 mm, borne singly.

2.5-4 mm, plump near the middle.

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)1.5-2.6 mm, exceeded by the florets, 1-veined, acute or acuminate, unawned or awned, awns to 1.4 mm;

lemmas 2-3.5 mm, elliptic, widest near the middle, appressed-pubescent on the lower 1/2 - 2/3 of the midveins and margins, hairs to 0.5 mm, apices scabridulous, acuminate, awned, awns 10-20(25) mm, flexuous;

paleas 2-3.5 mm, elliptic, intercostal region appressed-pubescent on the basal 1/2, apices acuminate;

anthers 1.5-2 mm, orange.

1-1.4 mm, fusiform, brownish.

1.5-2 mm, fusiform, brownish.

= 40, 42.

= 20, 40.