Flora of North America species comparison

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

nodes usually 3.

14-50(80) cm tall, 0.4-0.9 mm thick, mostly glabrous, lower internodes often puberulent or pubescent, particularly 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.

4.5-20 cm long, 0.5-1 cm wide, contracted;

branches appressed, lower branches 1-5 cm, with 2-7 spikelets.

pendulous.

subequal, 7-11 mm long, 0.6-0.9 mm wide, lanceolate, not saccate;

florets 3.5-5.5 mm long, 0.6-0.8 mm thick, fusiform, terete;

calluses 0.4-0.6 mm, sharp;

lemmas densely and evenly pilose, hairs at midlength 1.5-3.5 mm, apical hairs to 5 mm, apical lobes 0.3-2 mm, thin;

awns 13-25 mm, persistent, twice-geniculate, first 2 segments scabrous;

paleas 2.5-4 mm, from 2/3 as long as to equaling the lemmas, hairy;

anthers 1.8-2.6 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.

2.5-4 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 not becoming flat and ribbonlike with age, usually glabrous, throat sometimes with a few hairs, hairs about 0.2 mm;

collars glabrous, including the sides;

basal ligules 0.2-0.8 mm, truncate to rounded, membranous, glabrous;

upper ligules to 2 mm, rounded;

blades usually involute and 0.2-0.4 mm in diameter, 0.5-1 mm wide if flat, often arcuate distally, abaxial surfaces scabridulous, adaxial surfaces hairy, hairs about 0.1 mm.

= 44.

= 32.