Flora of North America species comparison

35-120 cm, not forming corms;

internodes smooth.

10-60 cm, forming corms;

internodes smooth or scabridulous.

glabrous or pilose, often most pilose at the throat and collar;

ligules 0.5-1.5 mm;

blades 1.5-4.5 mm wide, abaxial surfaces smooth, adaxial surfaces scabridulous, glabrous or puberulent.

scabridulous to scabrous;

ligules 0.5-2.6 mm;

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

6-25 cm;

branches 3-8 cm, appressed, with 2-6 spikelets;

pedicels straight;

disarticulation above the glumes.

4.5-18 cm;

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

pedicels straight.

7-20 mm, with 2-6 bisexual florets;

rachilla internodes 2-2.4 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.

obtuse to subacute;

lower glumes 4-10 mm long, 1.5-2.5 mm wide, 3-5-veined;

upper glumes 5-11 mm long, 1.8-2.5 mm wide, 5-7-veined;

lemmas 6-16 mm, hairy, hairs to 0.75 mm on the back, 0.7-1.3 mm on the margins, 9-11-veined, veins inconspicuous, apices mucronate to rounded, usually awned, awns 0.5-3 mm, fragile;

paleas about 3/4 as long as to nearly equaling the length of the lemmas;

anthers 3, 2.2-4 mm;

rudiments 2.5-6 mm, tapering, 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.

about 5 mm.

=18.

=18.