Flora of North America species comparison

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

nodes usually 3.

50-100 cm tall, 0.8-1.5 mm thick, glabrous;

nodes 2-3.

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.

20-55 cm long, 3-8 cm wide, open, often enclosed to midlength at anthesis;

lower branches 5-8 cm, ascending to divergent, flexuous.

pendulous.

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.

5-12 mm long, 0.5-0.7 mm wide, 3-5-veined;

upper glumes 1-4 mm shorter, 3-veined;

florets 4-7.5 mm long, 0.5-0.9 mm thick, fusiform, terete;

calluses 1-2 mm, sharp;

lemmas evenly hairy, hairs 0.4-0.8 mm throughout, apical lobes not present;

awns 35-70 mm, persistent, twice-geniculate, first 2 segments scabrous, terminal segment flexuous;

paleas 1-2 mm, 1/3 – 1/2 as long as the lemmas, sparsely to moderately pubescent, apices rounded, flat;

anthers 3-3.5 mm, dehiscent, a few penicillate, hairs about 0.3 mm.

3-4 mm, fusiform.

about 4 mm, fusiform.

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.

sheaths mostly glabrous, ciliate on the margins;

collars glabrous on the back, usually with tufts of hair on the sides, hairs about 0.8 mm;

basal ligules 0.8-1.6 mm, membranous, glabrous, rounded to acute;

upper ligules to 4.5 mm, acute;

blades 0.7-3.5 mm wide, abaxial surfaces smooth to scabridulous, adaxial surfaces prominently ribbed, scabridulous or sparsely to densely pubescent, hairs about 0.1 mm.

= 44.

= 44, 46.