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.

18-50 cm, erect, rounded near the base;

internodes glabrous.

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.

glabrous, bases becoming flattened and papery, lower sheaths longer than the internodes;

ligules 2-5 mm, membranous, acute to acuminate;

blades (5)6-12 cm long, 1-2.5 mm wide, flat, becoming loosely involute to subfiliform, scabrous abaxially, hirsute adaxially, apices not sharp.

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.

4-15 cm long, 1.5-4 cm wide, not dense;

primary branches 0.5-5 cm, appressed or diverging up to 40° from the rachises;

pedicels 0.5-6 mm, flattened, scabrous.

1.7-3.1 mm, occasionally with 2 florets.

2.8-3.5 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.

subequal, 0.6-1.8 mm, scabridulous distally, truncate to obtuse, unawned;

lower glumes 1-veined;

upper glumes 3-veined, 3-toothed, often erose;

lemmas 2.8-3.5 mm, lanceolate, loosely pubescent on the basal 1/3 of the midveins and margins, hairs to 0.6 mm, apices scabridulous, acute, mucronate, mucros shorter than 1 mm;

paleas 2.8-3.5 mm, lanceolate, acute;

anthers 1.4-2.3 mm, purple.

0.9-1.6 mm, narrowly ellipsoid, brown.

1.6-1.8 mm, fusiform, light brown.

= 40.

= 20.