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.

40-80 cm, stiffly erect from the base, not conspicuously branched;

internodes 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 than the internodes, smooth or scabridulous, basal sheaths rounded, not becoming spirally coiled when old;

ligules (2)4-7(9) mm, firmer near the base, obtuse, lacerate;

blades 8-35 cm long, 1-2 mm wide, flat or involute, filiform, glabrous abaxially, densely hirtellous 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.

10-20(30) cm long, 4-15 cm wide, about as wide as long, loosely contracted to open but not diffuse;

primary branches 1.4-10 cm, capillary, diverging up to 80° from the rachises, scabridulous, naked basally, lower branches with 5-15(20) spikelets;

pedicels 3-25 mm, longer than the spikelets, capillary, stiff, or flexuous.

1.8-2.8 mm, borne singly.

3.5-5 mm, stramineous or brownish to purplish.

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, 1-3 mm, shorter than the florets, hyaline, mostly sparsely hirtellous, apices glabrous, 1-veined (sometimes faintly so), acute, occasionally mucronate, mucros shorter than 0.7 mm;

lemmas 3.5-5 mm, narrowly lanceolate, calluses hairy, hairs to 0.5 mm, lemma bodies glabrous and smooth, apices scabridulous, acuminate, awned, awns 0.5-4(6) mm, clearly demarcated from the lemma bodies;

paleas 3.5-5 mm, narrowly lanceolate, mostly glabrous;

anthers 1.1-2 mm, yellowish to purplish.

1-1.4 mm, fusiform, brownish.

2-2.4 mm, fusiform, brownish.

= 40, 42.

= 20.