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.

3-20 cm.

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.

often longer than the internodes, somewhat inflated, smooth or scabrous;

ligules 1-3 mm, membranous, acute, lacerate, sometimes with lateral lobes;

blades 1-4.5 cm long, 0.8-2 mm wide, flat to involute, scabrous to strigose, midveins and margins thickened, whitish.

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.

3-11.5 cm long, 0.8-1.8 cm wide, contracted;

primary branches 1-3.7 cm, closely appressed, spikelets usually in subsessile-pedicellate pairs;

pedicels 0.2-8 mm, stout, closely appressed, scabrous;

disarticulation beneath the spikelet pairs.

1.8-2.8 mm, borne singly.

2.5-6 mm.

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.

to 2/3 as long as the lemmas;

lower glumes 2-3.5 mm, subulate, 2-veined, minutely to deeply bifid, with 2 aristate teeth or awns to 1.8 mm;

upper glumes 2.4-4 mm, entire, acuminate to attenuate, 1-veined, awned, awns to 2 mm;

lemmas 3.5-6 mm, narrowly lanceolate, light greenish-brown to purplish, scabrous, appressed-pubescent on the margins and mid-veins, apices acuminate, often bifid, awned, awns usually 10-20 mm, stiff;

paleas 4-6 mm, narrowly lanceolate, intercostal region appressed-pubescent, apices acuminate;

anthers 0.5-0.9 mm, purplish to yellowish.

1-1.4 mm, fusiform, brownish.

2-2.8 mm, narrowly fusiform, brownish.

= 40, 42.

= 20.