Flora of North America species comparison

25-95 cm tall, 0.8-1.5 mm thick, erect or ascending;

internodes smooth, shiny, and glabrous for most of their length, scabridulous immediately below the nodes.

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

internodes often smooth, shiny, glabrous.

glabrous, margins hyaline;

ligules 0.3-1 mm, membranous, truncate, ciliolate;

blades 4-16 cm long, 2-7 mm wide, flat, glabrous, usually smooth, occasionally scabridulous.

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.

4-18 cm long, 0.2-0.8 cm wide, narrow, usually exserted;

axillary panicles usually exserted, sometimes partially included in the subtending sheath;

primary branches 0.6-4 cm, ascending to appressed;

pedicels 0.3-1.6 mm, strigose.

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.

1.6-3 mm, erect, overlapping the next spikelet on the branch by 1/2 its length.

1.8-2.8 mm, borne singly.

equal to subequal, 1-2.5 mm, much shorter than the florets, scabridulous (particularly over the veins), 1-veined, narrowing from above the broad, overlapping bases to the acute apices, unawned or awned, awns to 1 mm;

lemmas 1.6-2.8 mm, lanceolate, hairy on the calluses, lower 1/2 of the midveins, and margins, hairs 0.3-0.5 mm, apices acuminate, unawned or awned, awns to 1 mm;

paleas 1.6-2.9 mm, lanceolate, basal 1/2 with hairs shorter than 1.

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.

1-1.5 mm, fusiform, brown.

1-1.4 mm, fusiform, brownish.

mm, apices scabridulous, acuminate;

anthers 0.4-1 mm, yellow.

= 40.

= 40, 42.