Flora of North America species comparison

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

nodes usually 3.

15-75 cm tall.

smooth, mostly glabrous, margins ciliate;

collars glabrous, with or without tufts of hair at the sides, hairs 0.7-2 mm;

ligules 1-4 mm, glabrous or sparsely hairy, acute, sometimes ciliate;

blades 1-2 mm wide, involute, 0.5-1 mm in diameter, abaxial surfaces scabridulous or smooth, adaxial surfaces densely hairy, hairs about 0.2 mm.

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.

5-20 cm long, 0.5-2.8 cm wide, loosely contracted;

branches strongly ascending, longest branches 0.5-2.5(5) cm.

pendulous.

evenly distributed along the branches;

pedicels loosely appressed to the branches, paired, unequal, shorter pedicels in each pair usually less than 1/2 as long as the longer pedicels.

slightly unequal, saccate below, tapering from about midlength, veins and sometimes also the intercostal regions puberulent, hairs to 0.1 mm, apices acute to acuminate;

lower glumes 5.1-6.1 mm;

upper glumes 4.3-5.2 mm;

florets 2.8-4.2 mm, ovoid;

calluses 0.2-0.4 mm, acute;

lemmas indurate, dark gray-brown, smooth, densely pilose, hairs at midlength and at the apices similar, 2-3 mm, easily rubbed off, apices not lobed;

awns 3-4.4 mm, rapidly deciduous, not geniculate, scabrous;

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

anthers about 1 mm, dehiscent, 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.

1-1.7 mm long, 0.8-1 mm in diameter, globose to obovoid.

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.

= unknown.