Flora of North America species comparison

14-120(180) cm tall, 0.3-2 mm thick, internodes glabrous or puberulent to densely pubescent;

nodes 2-4, glabrous or pubescent.

15-75 cm tall.

smooth, mostly glabrous, margins ciliate;

collars glabrous, with or without tufts of hair at the sides, hairs 0.7-2 mm;

ligules 1-4 mm, glabrous or sparsely hairy, acute, sometimes ciliate;

blades 1-2 mm wide, involute, 0.5-1 mm in diameter, abaxial surfaces scabridulous or smooth, adaxial surfaces densely hairy, hairs about 0.2 mm.

5-30 cm long, 0.5-1.5 cm wide;

branches appressed, straight, longest branches 1-7 cm.

5-20 cm long, 0.5-2.8 cm wide, loosely contracted;

branches strongly ascending, longest branches 0.5-2.5(5) cm.

appressed to the branches.

evenly distributed along the branches;

pedicels loosely appressed to the branches, paired, unequal, shorter pedicels in each pair usually less than 1/2 as long as the longer pedicels.

subequal, 9-15 mm long, 0.6-0.9 mm wide;

florets 5.5-7.5 mm long, 0.5-0.9 mm thick, fusiform, terete;

calluses 0.8-1.2 mm, sharp, dorsal boundary of the glabrous tip with the callus hairs narrowly acute;

lemmas evenly hair, hairs 0.5-1.5 mm at midlength, apical hairs somewhat longer than those below, sometimes similar in length to those at the base of the awns, sometimes longer, apical lobes 0.3-0.5 mm, membranous;

awns 15-55 mm, twice-geniculate, first 2 segments evidently hairy, terminal segment glabrous or partly to wholly pilose, sometimes scabrous;

paleas 2.2-3.5 mm, 2/5 – 3/5 as long as the lemmas, hairs at the tip usually shorter than 1 mm, frequently extending beyond the apices, apices rounded;

anthers 2.5-3.5 mm, dehiscent, not penicillate.

slightly unequal, saccate below, tapering from about midlength, veins and sometimes also the intercostal regions puberulent, hairs to 0.1 mm, apices acute to acuminate;

lower glumes 5.1-6.1 mm;

upper glumes 4.3-5.2 mm;

florets 2.8-4.2 mm, ovoid;

calluses 0.2-0.4 mm, acute;

lemmas indurate, dark gray-brown, smooth, densely pilose, hairs at midlength and at the apices similar, 2-3 mm, easily rubbed off, apices not lobed;

awns 3-4.4 mm, rapidly deciduous, not geniculate, scabrous;

paleas similar to the lemmas in length and texture, glabrous, apices pinched;

anthers about 1 mm, dehiscent, penicillate.

4-6 mm, fusiform.

1-1.7 mm long, 0.8-1 mm in diameter, globose to obovoid.

sheaths glabrous or puberulent to densely pubescent, often ciliate at the throat;

collars often with tufts of hair at the sides;

ligules 0.2-1.5 mm, often ciliate;

blades 0.5-3 mm wide and flat, or convolute and 0.1-0.8 mm in diameter, lax to straight.

=36.

= unknown.