Flora of North America species comparison

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

nodes usually 3.

25-70 cm tall, 0.7-1.3 mm thick, glabrous or partly scabridulous;

nodes 3-4.

glabrous or scabridulous, sometimes puberulent on the distal margins, hairs to 0.8 mm;

collars glabrous, sometimes with tufts of hair on the sides, hairs to 1 mm;

basal ligules 1.5-4 mm, hyaline, glabrous, acute;

upper ligules to 2 mm;

blades usually convolute, 0.1-1 mm in diameter, abaxial surfaces smooth or scabridulous, adaxial surfaces pubescent.

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.

9-20 cm long, 8-14 cm wide;

branches ascending to strongly divergent, longest branches 3-15 cm;

pedicels paired, conspicuously divaricate, shorter pedicels in each pair usually at least 1/2 as long as the longer pedicels.

pendulous.

subequal, 5-9 mm long, 0.8-2 mm wide, saccate below, puberulent, hairs about 0.1 mm, tapering above midlength, apices acuminate;

lower glumes 5-veined at the base, 3-veined at midlength;

upper glumes 5-7-veined at the base;

florets 3-4.5 mm long, 1-2 mm thick, obovoid;

calluses 0.4-1 mm, sharp;

lemmas indurate, densely and evenly pilose, hairs 2.5-6 mm, easily rubbed off, apices not lobed;

awns 3-6 mm, rapidly deciduous, not geniculate, scabrous;

paleas subequal to the lemmas in length and texture, glabrous, apices pinched;

anthers 1.5-2 mm, penicillate, dehiscent, well-filled.

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.

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.

= 44.

= 46, 48.