Flora of North America species comparison

35-120 cm, not forming corms;

internodes smooth.

50-130 cm, not forming corms;

lower nodes strigose;

internodes usually smooth, sometimes puberulent below the nodes, lower 2-3 internodes usually swollen.

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.

glabrous or pilose;

ligules 1.5-4 mm;

blades 1.5-5 mm wide, strigose on both surfaces.

6-25 cm;

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

pedicels straight;

disarticulation above the glumes.

4-30 cm;

branches 3-6 cm, appressed, straight, with 4-15 spikelets;

pedicels straight;

disarticulation above the glumes.

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

rachilla internodes 2-2.4 mm.

5-15 mm, with 2-5 bisexual florets;

rachilla internodes 1.1-1.6 mm.

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.

3.5-12 mm long, 2.5-3 mm wide, 3-5-veined;

upper glumes 5-13 mm long, 2-2.5 mm wide, 5-7-veined;

lemmas 5-9 mm, glabrous, smooth to scabrous, 7-9-veined, veins inconspicuous, apices rounded to broadly acute, unawned;

paleas about 3/4 the length of the lemmas;

anthers 3, 1.8-3 mm;

rudiments 1.4-3 mm, clublike, not resembling the bisexual florets, truncate to acute.

about 5 mm.

=18.

= 18.