Flora of North America species comparison

20-100 cm.

30-130 cm.

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;

ligules ciliate;

blades 4-10 mm wide, loosely twisted, adaxial surfaces with papillose-based hairs basally.

6-15 cm, tightly spikelike, pale green;

rachises scabrous or villous;

bristles usually solitary, 4-15 mm, ascending.

3-15 cm, uniformly thick, erect, densely spicate;

rachises hispid;

bristles 4-12, 3-8 mm, antrorsely scabrous.

2.2-2.8(3) mm, elliptical.

2-3.4 mm, strongly turgid.

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.

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

upper glumes about 1/2 as long as the spikelets, 5-veined, ovate;

upper florets often staminate;

lower lemmas equaling the upper lemmas;

lower paleas equaling the lower lemmas, broad;

upper lemmas conspicuously exposed, strongly transversely rugose.

= 54, 68, 72.

= 36, 72.