Flora of North America species comparison

5-30 cm tall, 0.4-1 mm thick, decumbent, geniculate, or erect;

internodes usually nodulose (occasionally smooth) for most of their length, puberulent or nodulose below the nodes.

3-20 cm.

shorter or longer than the internodes, glabrous;

ligules 0.8-3 mm, membranous, acute to truncate, erose;

blades 0.4-6.5 cm long, 0.5-4.2 mm wide, flat or involute, straight or arcuate-spreading, glabrous abaxially, hirtellous adaxially.

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.

1-15 cm long, 0.1-1.7 cm wide, exserted, narrow or spikelike, rachises usually concealed by the branches;

primary branches 0.4-5 cm, usually closely appressed at maturity, rarely diverging up to 20° from the rachises;

pedicels 0.2-2 mm, setulose.

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.

1.7-3.1 mm, occasionally with 2 florets.

2.5-6 mm.

subequal, 0.6-2 mm, 1/3– 1/2 as long as the lemmas, green, 1(2)-veined, acute, sometimes mucronate, mucros less than 0.2 mm;

lemmas 1.7-2.6(3.1) mm, lanceolate, dark greenish, plumbeous, or mottled, glabrous, apices scabridulous, acute to acuminate, sometimes mucronate, mucros to 0.5 mm;

paleas 1.2-2.4(2.9) mm, lanceolate, acute;

anthers 0.9-1.6 mm, yellow to purplish.

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.

0.9-1.6 mm, narrowly ellipsoid, brown.

2-2.8 mm, narrowly fusiform, brownish.

= 40.

= 20.