Flora of North America species comparison

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

internodes sometimes pubescent below the nodes.

30-100 cm, not forming corms;

internodes smooth.

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.

glabrous or sparsely pilose, sometimes pilose only at the throat, sometimes scabridulous;

ligules 1-5 mm;

blades 1-2.5 mm wide, sometimes pilose on both surfaces, sometimes scabridulous.

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.

6-25 cm;

branches 1-5 cm, usually appressed, occasionally divergent, with 5-37 spikelets;

pedicels straight;

disarticulation above the glumes.

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

rachilla internodes 2.5-3 mm.

3.5-7 mm, with 1(2) bisexual florets.

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, about 1 mm wide, 1-5-veined;

upper glumes 3.3-7 mm long, 1-2 mm wide, 3-5-veined;

lemmas 3.5-6 mm, scabridulous, sometimes hairy, distal hairs longer than those below, 7-veined, veins inconspicuous, apices rounded to emarginate, unawned or awned, awns 1-2 mm;

paleas slightly shorter than the lemmas;

anthers 1.5-2.5 mm;

rudiments 0.5-4 mm, clearly distinct from the bisexual florets, shorter than the terminal rachilla internode, truncate to acute.

= unknown.

=18.