Flora of North America species comparison

40-120 cm, not forming corms;

internodes smooth.

35-120 cm, not forming corms;

internodes smooth.

glabrous, scabrous, sometimes sparsely pilose;

ligules 2.5-5 mm;

blades 5.5-15 cm long, 2-6 mm wide, often sparsely pilose on both surfaces.

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.

10-26 cm;

branches 4-6 cm, appressed or strongly ascending, with 1-4 spikelets per branch;

pedicels not sharply bent;

disarticulation above the glumes.

6-25 cm;

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

pedicels straight;

disarticulation above the glumes.

11-21 mm, with (2)3-5 bisexual florets;

rachilla internodes 3.4-3.8 mm.

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

rachilla internodes 2-2.4 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.

9-11 mm long, 1.5-2.5 mm wide, 3-5-veined;

upper glumes 11-12 mm long, 2-3 mm wide, 5-7-veined;

lemmas 8-13 mm, with 0.3-0.6 mm hairs on the marginal veins, glabrous or with hairs to 0.1 mm elsewhere, 5-7-veined, veins prominent, apices bifid to emarginate, awned from the sinuses, awns 5-12 mm;

paleas about 3/4 the length of the lemmas;

anthers 2, 2-3 mm;

rudiments 2.5-6 mm, tapering, resembling the bisexual florets.

5-6 mm.

about 5 mm.

=18.

=18.