Flora of North America species comparison

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

nodes usually 3.

25-90 cm tall, 0.5-1.6 mm thick, glabrous;

nodes 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.

7-21 cm long, 0.5-1 cm wide;

branches appressed to ascending, straight.

pendulous.

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.

10-17 mm long, 0.7-1.2 mm wide, exceeding the upper glumes by 2.5-4.5 mm, apices tapering, often slightly recurved;

florets 6-9.5 mm long, 0.6-1.1 mm thick, fusiform, terete, widest at or below midlength;

calluses 0.5-1.5 mm, sharp;

lemmas evenly hairy, hairs at midlength to 1 mm, apical hairs 2-3 mm, ascending, apical lobes 0.3-0.5 mm;

awns 13-25 mm, persistent, usually once-geniculate, first segment scabrous, terminal segment straight;

paleas 2.5-3.5 mm, 1/3 – 1/2 as long as the lemmas, pubescent, hairs not exceeding the apices, apices rounded;

anthers 3-5 mm, dehiscent, not penicillate.

3-4 mm, fusiform.

5-6 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 becoming flat and papery, margins ciliate distally;

collars glabrous, with tufts of hair on the sides, hairs on the basal leaves to 1.5 mm, hairs on the flag leaves 1-2.5 mm;

basal ligules 0.3-0.8 mm, truncate, erose, ciliate, cilia 0.2-0.4 mm;

upper ligules to 1.5 mm, asymmetric, obliquely truncate for most of their width, abruptly longer on 1 side;

blades to 30 cm long, 2-5 mm wide, flat or involute, long-tapering.

= 44.

= 40.