Flora of North America species comparison

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

nodes usually 3.

(10)15-40 (45) cm tall, 0.5-0.7 mm thick, glabrous;

nodes 1-2.

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)5-13(15) cm long, to 10 cm wide, lax;

branches divergent, flexuous, longest branches 2-10 cm, with spikelets confined to the distal portions, drooping.

pendulous.

obtuse to acute;

lower glumes 3.5-7 mm long, 0.8-1.3 mm wide, 5(7)-veined;

upper glumes 3-6.5 mm, 3-veined;

florets 3-5.5 mm long, 1-1.5 mm thick, fusiform, terete;

calluses 0.1-0.2 mm, blunt;

lemmas coriaceous, shiny, glabrous, black to dark brown at maturity, margins overlapping at maturity, apices thickened dorsally;

awns 5-11 mm, readily deciduous, not or weakly geniculate, scabrous;

paleas 2.8-4.5 mm, similar to the lemmas in texture, glabrous;

anthers 1.6-1.8 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.

2-4 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 becoming flat with age, glabrous;

collars glabrous, including the sides;

basal ligules 0.8-1.3 mm, membranous, truncate to broadly acute, glabrous;

upper ligules to 1.6 mm;

blades tightly valvate to involute, 0.5-0.8 mm in diameter, abaxial surfaces scabridulous, adaxial surfaces hairy, sometimes densely hairy, hairs shorter than 0.05 mm.

= 44.

= unknown.