Flora of North America species comparison

5-45 cm, arising from the bases of old depressed culms, compressed-keeled, developing branches below the lower leaf nodes;

internodes mostly glabrous, sometimes minutely puberulent below the nodes.

3-20 cm.

longer than the internodes, keeled, keels scabridulous, not becoming papery or spirally coiled when old;

ligules 0.5-1.5 mm, membranous, truncate to obtuse, erose, without lateral lobes;

blades 1-15 cm long, 0.8-2 mm wide, flat to conduplicate, smooth or scabridulous abaxially, hirtellous adaxially, midveins thickened and whitish proximally.

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.

2-20 cm long, (0.2)2.5-6 cm wide, diffuse;

primary branches 0.4-6 cm long, about 0.1 mm thick, ascending, diverging 10-60° from the rachises, naked basally;

pedicels 0.2-7 mm, glabrous.

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.

1.3-2.1 mm, dark purplish to plumbeous, occasionally with 2 florets.

2.5-6 mm.

equal, 0.4-1.3 mm, glabrous, 1-veined, apices scabrous, acute to obtuse, sometimes erose or notched, unawned;

lemmas 1.2-2 mm, oblong-elliptic, dark purplish to plumbeous, glabrous, faintly 3-veined, apices acute to obtuse, unawned;

paleas 1.3-2.1 mm, oblong-elliptic, glabrous, acute to obtuse;

anthers 0.6-0.9 mm, dark purple.

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.

0.6-0.8 mm, ovoid, brownish.

2-2.8 mm, narrowly fusiform, brownish.

= 42.

= 20.