Flora of North America species comparison

60-160 cm, thickened basally, sometimes appearing cormous;

internodes sometimes pubescent below the nodes.

10-60 cm, forming corms;

internodes smooth or scabridulous.

usually glabrous, sometimes pilose or retrorsely scabrous, particularly at the throat, veins often prominent;

ligules 2-4 mm;

blades 15-25 cm long, 5-12 mm wide, both surfaces usually scabridulous, glabrous, sometimes the adaxial surfaces with hairs.

scabridulous to scabrous;

ligules 0.5-2.6 mm;

blades 1.2-5 mm wide, sometimes pilose on both surfaces.

12-30 cm;

branches 7-11 cm, spreading to reflexed, with 4-7 spikelets, spikelets restricted to the distal portion, axils frequently with brownish pulvini;

pedicels straight;

disarticulation above the glumes.

4.5-18 cm;

branches 0.8-4 cm, appressed to ascending, with 1-5 spikelets;

pedicels straight.

12-18 mm, with 3-5 bisexual florets;

rachilla internodes 2.5-3 mm.

4-17 mm, with 2-5 bisexual florets;

rachilla internodes 2.1-2.3 mm, swollen when fresh, wrinkled when dry;

disarticulation above the glumes.

4.5-7 mm long, 1-1.5 mm wide, 1-3-veined;

upper glumes 6.5-9 mm long, 1.2-1.8 mm wide, 3-5-veined;

lemmas 9.5-12 mm, glabrous or scabrous, 7-veined, apices bifid to emarginate, awned, awns 3-10 mm;

paleas about 2/3 the length of the lemmas;

anthers 1.3-2.5 mm;

rudiments 3.5-6 mm, tapering, resembling the bisexual florets.

3-5 mm long, 1.5-2.5 mm wide, 1-3-veined;

upper glumes 3.5-7 mm long, 2.5-3.5 mm wide, 5-veined;

lemmas 4-7 mm, glabrous or scabrous, 4-11-veined, veins inconspicuous, apices rounded to acute, unawned;

paleas almost as long as the lemmas;

anthers 3, 1-2 mm;

rudiments 1.5-3.5 mm, tapering, resembling the bisexual florets.

= unknown.

=18.