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.

55-210 cm tall, 3-6 mm thick, internodes usually glabrous, lower internodes sometimes puberulent;

nodes 1-2, glabrous.

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

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

15-60 cm long, 2-4 cm wide;

branches widely spreading to ascending, longest branches 4-13 cm.

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.

lanceolate, glabrous, tapering to awnlike apices;

lower glumes 16-21 mm long, 1-1.3 mm wide, midveins scabrous;

upper glumes 11-18 mm;

florets 6.5-10 mm long, about 1 mm thick, fusiform, terete;

calluses 0.5-2 mm, blunt to acute;

lemmas densely hairy, hairs at midlength 1.5-4 mm, apical hairs 2-5 mm;

awns 25-45 mm, persistent, twice-geniculate, all segments scabrous, terminal segment straight;

paleas 3.5-5.5 mm, 3/5 – 9/10 as long as the lemmas, sparsely hairy between the veins, apices flat, rounded;

anthers 3-4 mm, dehiscent, not penicillate.

4-6 mm, fusiform.

5-7 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 mostly glabrous, often puberulent on the lower portion, flat, ribbonlike with age, margins hairy distally, hairs 1-2.5 mm;

collars mostly glabrous;

ligules 0.4-1.6(3) mm, truncate to slightly rounded, abaxial surfaces pubescent, ciliate, cilia about 0.5 mm;

blades usually flat, 2.5-7 mm wide, both surfaces scabrous.

=36.

= 40.