Flora of North America species comparison

100-230 cm tall, 2-4.5 mm thick, mostly glabrous, often pubescent below the nodes, the pubescence antrorse or retrorse;

nodes 4-5.

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

nodes 2-4, glabrous or pubescent.

15-30 cm long, 0.8-3.5 cm wide;

branches straight, appressed to ascending, lower branches 3-9 cm.

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

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

appressed to the branches.

appressed to the branches.

subequal, 9-11.5 mm long, 1-1.4 mm wide;

florets 5.9-8.5 mm long, 0.9-1.2 mm thick, fusiform, terete;

calluses 0.3-1 mm, blunt;

lemmas evenly hairy, hairs at midlength 0.3-0.8 mm, apical hairs to 1.5 mm;

awns 20-32 mm, persistent, twice-geniculate, scabridulous to scabrous, scabrules to about 0.1 mm, longest on the middle segment, terminal segment straight;

paleas 3.7-5.6 mm, 2/3 - 3/4 as long as the lemmas, hairy, hairs about 0.5 mm, not exceeding the apices, veins terminating below the apices, apices rounded;

anthers 4-5 mm, dehiscent, penicillate.

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.

5-6 mm.

4-6 mm, fusiform.

sheaths mostly glabrous, margins usually ciliate distaily;

collars hairy, those of the flag leaves densely hairy, hairs 0.5-2 mm, sides glabrous;

basal ligules 1-2 mm;

upper ligules to 4 mm, truncate, rounded, or obtuse, glabrous;

blades 6-10 mm wide, glabrous, abaxial surfaces smooth, adaxial surfaces prominently ribbed, ribs scabrous.

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.

= 64.

=36.