Flora of North America species comparison

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

internodes sometimes pubescent below the nodes.

35-120 cm, not forming corms;

internodes scabridulous immediately above the nodes.

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 pilose;

ligules 0.8-6.5 mm;

blades 1-6 mm wide, abaxial surfaces glabrous or puberulent, adaxial surfaces with hairs.

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.

5-36 cm;

branches 2.5-9 cm, appressed to reflexed, straight or flexuous, with 5-30 spikelets;

pedicels not sharply bent;

disarticulation above the glumes.

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

rachilla internodes 2.5-3 mm.

3-7 mm, with 1(2) bisexual florets;

rachilla internodes 0.3-0.6 mm.

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.

2-5 mm long, 1-2 mm wide, 1-veined;

upper glumes 2.5-6 mm long, 1.5-2.5 mm wide, 1-veined;

lemmas 3-7 mm, glabrous, sometimes scabrous, with 7+ veins, veins prominent, apices rounded to acute, unawned;

paleas almost as long as the lemmas;

anthers 1.5-2.5 mm;

rudiments 1-4 mm, not resembling the lower florets, longer and thicker than the terminal rachilla internode, truncate to obtuse.

= unknown.

= 18.