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.

30-100 cm tall, 1-1.5 mm thick, glabrous;

nodes usually 3.

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

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

7-25 cm long, 7-15 cm wide;

branches divergent, flexuous, longest branches 7-10 cm, with the spikelets confined to the distal 1/4.

appressed to the branches.

pendulous.

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.

7.5-11 mm long, 0.9-1.2 mm wide;

upper glumes 2-3 mm shorter;

florets 5-6 mm long, 0.6-0.9 mm thick, fusiform, terete;

calluses 0.4-0.7 mm, blunt;

lemmas evenly hairy on the lower portion, often glabrate distally, body and apical hairs 0.2-0.5 mm, apical lobes not or scarcely developed, to 0.1 mm;

awns 15-25 mm, persistent, twice-geniculate, first 2 segments strigulose, hairs about 0.1 mm, terminal segment straight;

paleas 2.2-3.6 mm, 1/2 - 3/5 as long as the lemmas, pubescent, hairs not exceeding the apices, apices rounded;

anthers 2.5-3 mm, dehiscent, penicillate, hairs 0.1-0.5 mm.

4-6 mm, fusiform.

3-4 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, margins ciliolate;

collars glabrous, without tufts of hair on the sides;

ligules 0.1-0.5 mm, truncate, ciliolate;

blades 0.8-3 mm wide, convolute when dry, abaxial surfaces scabridulous, adaxial surfaces glabrous.

=36.

= 44.