Flora of North America species comparison

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

internodes sometimes pubescent below the nodes.

9-85 cm, not forming corms;

basal internodes often thickened;

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.

scabridulous;

ligules 2.5-5 mm;

blades 1.5-5 mm wide, abaxial surfaces glabrous, scabridulous, adaxial surfaces sometimes strigose, sometimes glabrous or 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.

3-30 cm;

branches 0.5-10 cm, appressed, with 1-5 spikelets;

pedicels sharply bent below the spikelets;

disarticulation below the glumes.

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

rachilla internodes 2.5-3 mm.

6-23 mm long, 5-13 mm wide, broadly V-shaped when mature, with 2-4 bisexual florets;

rachilla internodes 1.8-2.1 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.

6-16 mm long, 3.5-5 mm wide, 4-7-veined;

upper glumes 6-18 mm long, 3-5 mm wide, 5-9-veined;

lemmas 6-16 mm, glabrous, scabridulous, 5-9-veined, veins inconspicuous, apices acute, unawned;

paleas 1/2 - 3/4 the length of the lemmas;

anthers 1-3 mm;

rudiments 2-7 mm, resembling the lower florets, acute to acuminate.

4-5 mm.

= unknown.

= 18.