Flora of North America species comparison

30-75 cm tall, 0.5-1.7 mm thick, internodes pubescent or glabrous, pubescence more common on the lower internodes, particularly just below the nodes;

nodes 2-3, lower nodes retrorsely pubescent, upper nodes glabrous or pubescent.

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.

7-15 cm long, 0.5-2.5 cm wide, often included in the upper leaf sheaths at the start of anthesis;

branches 1.5-6 cm, appressed to strongly ascending, with 1-6 spikelets.

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.

often purplish;

lower glumes 10-15 mm long, 1.2-2 mm wide;

upper glumes to 2 mm shorter;

florets 6-9 mm long, 0.7-1.2 mm thick, fusiform, terete;

calluses 0.9-1.5 mm, sharp;

lemmas coriaceous, evenly pubescent or the back glabrate distally, hairs 0.5-0.8 mm, apices lobed on 1 margin, lobe about 0.1 mm long, thick, apical lemma hairs 0.5-0.8 mm;

awns 32-56 mm, twice-geniculate, first 2 segments pilose, hairs 0.8-2 mm, terminal segment glabrous, often scabrous;

paleas 4.6-6.1 mm, 3/4 - 9/10 as long as the lemmas, sparsely pubescent towards the base;

anthers 2.5-3.5 mm, dehiscent, not penicillate.

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.

5-7 mm, fusiform.

2-3 mm.

sheaths glabrous, usually smooth, brown or gray-brown;

collars glabrous, without tufts of hair at the sides;

basal ligules 1.5-6 mm, hyaline, rounded to acute, lacerate;

upper ligules to 8 mm, hyaline, acute, glabrous;

blades 0.5-2 mm wide, convolute, abaxial surfaces scabrous, adaxial surfaces scabrous or hairy, hairs about 0.3 mm.

=34.

= 46, 48.