Flora of North America species comparison

10-60 cm, forming corms;

internodes smooth or scabridulous.

35-120 cm, not forming corms;

internodes scabridulous immediately above the nodes.

scabridulous to scabrous;

ligules 0.5-2.6 mm;

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

glabrous or pilose;

ligules 0.8-6.5 mm;

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

4.5-18 cm;

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

pedicels straight.

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.

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.

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

rachilla internodes 0.3-0.6 mm.

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.

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.

=18.

= 18.