Flora of North America species comparison

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

nodes usually 3.

35-90 cm tall, 0.7-2.2 mm thick, lower internodes glabrous, puberulent to 5 mm below the nodes;

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.

10-25 cm long, 0.5-1.5 cm wide;

branches ascending to appressed, straight.

pendulous.

appressed to the branches.

unequal;

lower glumes 10-15 mm long, 0.5-1.1 mm wide, exceeding the upper glumes by 1-3(4) mm;

florets 5.5-11 mm long, 0.7-1 mm thick, fusiform, terete, widest at or below midlength;

calluses 0.4-0.6 mm, blunt;

lemmas evenly hairy, hairs at midlength about 1 mm, apical hairs 1-2 mm, ascending to divergent, apical lobes 0.2-0.5 mm, membranous, flexible;

awns 10-19 mm, persistent, once(twice)-geniculate, basal segments scabrous, terminal segments straight;

paleas 2.8-5.6 mm, 1/2 -2/3 as long as the lemmas, hairy, hairs not or scarcely exceeding the apices, veins terminating at or before the apices, apices acute to rounded;

anthers 2.5-4 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.

3-6 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, margins ciliolate distally;

collars glabrous, including the sides;

basal ligules 0.2-0.5 mm, truncate, ciliolate, cilia to 0.1 mm;

upper ligules 0.2-3.5 mm, rounded to acute;

blades to 30 cm long, 1-3 mm wide.

= 44.

= unknown.