Flora of North America species comparison

55-130 cm, not forming corms;

internodes smooth.

10-60 cm, forming corms;

internodes smooth or scabridulous.

glabrous or scabridulous;

ligules 1-6.5 mm;

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

scabridulous to scabrous;

ligules 0.5-2.6 mm;

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

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.

4.5-18 cm;

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

pedicels straight.

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.

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.

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.

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.

= 18.

=18.