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.

20-85 cm tall, 0.8-1.2 mm thick, usually retrorsely pubescent below the lower nodes, sometimes glabrous, sometimes pubescent over the whole of the internodes;

nodes 3-4.

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

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

6-25 cm long, 0.4-1.5 cm wide;

branches appressed, lower branches 2-7.5 cm.

appressed to the branches.

appressed to the branches.

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.

subequal, 7-14 mm;

lower glumes 0.6-0.9 mm wide;

florets 5-6.5 mm long, 0.6-1 mm thick, fusiform, terete;

calluses 0.5-0.7 mm, sharp, dorsal boundary of the glabrous tip with the callus hairs rounded to acute;

lemmas evenly hairy, hairs 0.5-1 mm at midlength, apical hairs 0.8-2 mm, longer than those at midlength and those at the base of the awn, apical lobes membranous, about 0.2 mm;

awns 20-35 mm, persistent, twice-geniculate, first 2 segments pilose, with hairs 0.5-1.5 mm and of mixed lengths, terminal segment scabridulous to smooth;

paleas 2.8-4.2 mm, 1/2 - 3/4 as long as the lemmas, pubescent, distal hairs usually about 1 mm, extending well beyond the apices, apices rounded;

anthers about 2.5 mm, dehiscent, not penicillate.

4-6 mm, fusiform.

3-5.5 mm, fusiform.

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.

sheaths glabrous or pubescent, sometimes scabridulous, usually glabrous at the throat, becoming brown to gray-brown;

collars, including the sides, glabrous;

basal ligules 0.2-0.7 mm, truncate;

upper ligules 0.3-1 mm, often wider than the blades;

blades usually 10-25 cm long, 1-3 mm wide, usually involute, abaxial surfaces glabrous, adaxial surfaces more or less puberulent.

=36.

= 68.