Flora of North America species comparison

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

nodes usually 3.

30-50 cm tall, 1-1.3 mm thick, glabrous;

nodes 3-4.

glabrous;

collars puberulent, hairs about 0.2 mm, sometimes the margins with poorly developed tufts of hair to 0.5 mm;

ligules 1.8-5 mm, broadly to narrowly acute, glabrous;

blades 0.5-1.5 mm wide, flat or convolute, abaxial surfaces smooth, adaxial surfaces scabridulous.

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.

6-25 cm long, 7-15 cm wide;

branches ascending to strongly divergent, longest branches 5-8 cm;

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

pendulous.

confined to the distal 1/2 of the branches.

saccate below, tapering at midlength, glabrous, midveins sometimes scabridulous, apices acuminate;

lower glumes 5.5-7 mm long, 0.9-1.5 mm wide;

upper glumes about 0.3 mm shorter;

florets 2.5-3.5 mm long, 0.7-1.5 mm thick, fusiform to obovoid;

calluses 0.3-0.5 mm, blunt;

lemmas densely pilose, hairs at midlength and on the apices similar, 1.2-2 mm, apical lobes 0.5-0.6 mm;

awns 6.5-9 mm, readily deciduous, scabrous;

paleas similar to the lemmas in length, texture, and pubescence, distal hairs exceeding the paleal apices, apices rounded, flat;

anthers about 1.5 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.

1.5-2.5 mm, 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.

= 48.