Flora of North America species comparison

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

nodes usually 3.

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.

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.

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

branches appressed, lower branches 2-7.5 cm.

pendulous.

appressed to the branches.

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.

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.

3-4 mm, fusiform.

3-5.5 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 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.

= 44.

= 68.