Flora of North America species comparison

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

nodes usually 3.

40-100 cm tall, 0.6-2.6 mm thick, glabrous or sparsely pubescent to 5 mm below the lower nodes;

nodes 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.

12-28 cm long, 0.5-1.5 cm wide;

branches ascending to appressed, straight, longest branches 3-6 cm.

pendulous.

appressed to the branches.

unequal;

lower glumes 9.5-12.5 mm long, 0.8-1.2 mm wide, 3(5, 7)-veined, apices straight to somewhat recurved;

upper glumes 2-3.5 mm shorter, 3-veined;

florets 5.5-7.5 mm long, 0.6-1.1 mm thick, terete, widest about midlength;

calluses 0.3-0.5 mm, blunt;

lemmas evenly hairy, hairs at midlength 0.7-1.2 mm, fusiform, terete, apical hairs 1.3-2.2 mm, erect, usually less than 1 mm longer than those at midlength, apical lobes 0.5-1.2 mm, membranous, flexible;

awns 10-22 mm, persistent, once- or twice-geniculate, scabrous, terminal segments straight;

paleas 3-4.3 mm, 3/5 – 3/4 as long as the lemmas, pubescent, hairs exceeding the apices, veins terminating below the apices, apices flat, rounded;

anthers 3-4 mm, dehiscent, sparsely penicillate, hairs about 0.1 mm.

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.

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 and papery in age, margins sometimes ciliate distally, cilia to 0.5 mm;

collars, including the sides, glabrous or sparsely pubescent, collars of the flag leaves glabrous;

basal ligules 0.2-1.3 mm, membranous, truncate, erose to ciliate, cilia about 0.05 mm;

upper ligules 0.3-1 mm;

blades 1-4 mm wide, abaxial surfaces smooth, adaxial surfaces scabrous.

= 44.

= unknown.