Flora of North America species comparison

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

nodes usually 3.

15-25 cm tall, 0.5-1 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.

3-6.5 cm long, 0.3-0.7 cm wide;

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

pendulous.

subequal, 4-5.5 mm, not saccate, apices narrowly acute to acuminate, midveins often prolonged into an awnlike tip;

lower glumes 0.6-1 mm wide, apices narrowly acute;

florets 2.5-3.5 mm long, 0.6-0.8 mm thick, fusiform, terete;

calluses 0.1-0.2 mm, blunt;

lemmas evenly hairy, hairs 0.3-0.5 mm, all similar in length, apical lobes 0.3-0.5 mm, thickly membranous;

awns 5-6 mm, once-geniculate, readily deciduous, basal segment scabridulous;

paleas 2.2-2.5 mm, slightly shorter than the lemmas;

anthers 1.5-2 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.

2-3 mm, ovoid.

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, pubescent at the base, throats glabrous;

collars, including the sides, glabrous;

basal ligules 0.2-0.3 mm, obtuse to rounded, glabrous;

upper ligules to 0.5 mm, rounded to broadly acute;

blades 0.4-0.7 mm wide, arcuate, abaxial surfaces smooth or scabridulous, adaxial surfaces with hairs shorter than 0.5 mm.

= 44.

= 34.