Flora of North America species comparison

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

internodes sometimes pubescent below the nodes.

55-130 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 scabridulous;

ligules 1-6.5 mm;

blades 3.5-11 mm wide, flat, abaxial surfaces smooth or scabridulous, adaxial surfaces 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.

9-26 cm;

branches 3.5-6 cm, often divergent to reflexed, straight, with 5-20 spikelets;

pedicels sharply bent and hairy below the spikelets;

disarticulation below the glumes.

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

rachilla internodes 2.5-3 mm.

8-12 mm, with 2-3(4) bisexual florets, apices of the lowest 2 florets not at the same level;

rachilla internodes 2.3-2.4 mm.

unequal;

lower glumes 5-9 mm long, 3.5-4.5 mm wide, more ovate than the upper glumes, 3-9-veined;

upper glumes 6-11 mm long, 2.5-3.5 mm wide, 3-7-veined;

lemmas 6.5-11.5 mm, glabrous or scabrous, somewhat indurate, with 9+ veins, veins prominent, apices rounded, unawned;

paleas about 3/4 the length of the lemmas;

anthers 1.7-3.2 mm;

rudiments 2-3 mm, clublike, not resembling the bisexual florets, in a straight line with the rachilla.

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.

= unknown.

= 18.