Flora of North America species comparison

14-100 cm, not forming corms;

internodes smooth.

10-60 cm, forming corms;

internodes smooth or scabridulous.

glabrous or scabrous;

ligules 2.5-7 mm;

blades 1.2-3 mm wide, abaxial surfaces glabrous, scabridulous, adaxial surfaces puberulent.

scabridulous to scabrous;

ligules 0.5-2.6 mm;

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

5-25 cm;

branches 1-5 cm, appressed to reflexed, straight, with 2-9 spikelets;

pedicels sharply bent 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.

6-8 mm, with 1 bisexual floret.

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.

5.5-8 mm long, 1.8-3 mm wide, 5-veined;

upper glumes 5-8 mm long, 0.7-1.5 mm wide, 3-5-veined;

lemmas 4.5-8 mm, 9-15-veined, veins prominent, tuberculate, proximal portion with flat, twisted hairs, distal portion glabrous, chartaceous, apices emarginate to acute, unawned;

paleas about 3/4 the length of the lemmas;

anthers 1.5-3 mm;

rudiments 2-3 mm, obovoid or obconic, clublike, not resembling the bisexual florets.

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.