Flora of North America species comparison

20-100 cm.

to 6 m tall, 2-3 cm thick at the base.

compressed, glabrous, margins villous distally;

ligules 1-2.5 mm, ciliate;

blades 8-25 cm long, 2-5 mm wide, flat or folded, scabrous on both surfaces.

glabrous, smooth or scabrous, margins villous distally;

ligules 1-2 mm, ciliate;

blades to 60 cm long, to 3.5 cm wide, flat.

6-15 cm, tightly spikelike, pale green;

rachises scabrous or villous;

bristles usually solitary, 4-15 mm, ascending.

to 50 cm long, to 5 cm wide, densely spikelike;

rachises densely villous;

bristles 1 or 2, 10-20 mm, flexible, antrorsely scabrous.

2.2-2.8(3) mm, elliptical.

about 2 mm, disarticulating between the lower and upper florets.

about 1/2 as long as the spikelets, 3-veined;

upper glumes from 3/4 as long as to equaling the florets, 5-veined;

lower lemmas equaling the upper lemmas, 5-veined;

lower paleas 1/2 - 3/4 as long as the upper paleas, lanceolate;

upper lemmas apiculate, finely and transversely rugose;

upper paleas similar.

1/3 as long as the spikelets, 3-veined;

upper glumes equaling the lower lemmas, 7-veined;

lower florets often staminate;

lower lemmas slightly exceeding the upper lemmas;

lower paleas equaling the lower lemmas, broad, hyaline, minutely pubescent over the veins;

upper lemmas smooth and shiny brown;

upper paleas similar to the upper lemmas.

= 54, 68, 72.

= 36.