Flora of North America species comparison

45-100 cm, not forming corms;

internodes sometimes scabridulous above the nodes.

30-100 cm, not forming corms;

internodes smooth.

glabrous or pilose;

ligules 0.5-1.5 mm;

blades 1.8-6 mm wide, abaxial surfaces glabrous, scabridulous, adaxial surfaces with hairs.

glabrous or sparsely pilose, sometimes pilose only at the throat, sometimes scabridulous;

ligules 1-5 mm;

blades 1-2.5 mm wide, sometimes pilose on both surfaces, sometimes scabridulous.

4-25 cm;

branches 3.5-6 cm, appressed to spreading, straight, with 2-5 spikelets;

pedicels sharply bent below the spikelets;

disarticulation below the glumes.

6-25 cm;

branches 1-5 cm, usually appressed, occasionally divergent, with 5-37 spikelets;

pedicels straight;

disarticulation above the glumes.

6-11 mm, with (1)2(4) bisexual florets, floret apices at about the same level;

rachilla internodes 1.5-1.7 mm.

3.5-7 mm, with 1(2) bisexual florets.

4.5-8 mm long, 3-4 mm wide, 5-7-veined;

upper glumes 5-9 mm long, 2.5-3.5 mm wide, 5-6-veined;

lemmas 6-11 mm, glabrous or scabrous, indurate, 9-11-veined, veins prominent, apices rounded to acute, unawned;

paleas about 3/4 the length of the lemmas;

anthers 1-3 mm;

rudiments 2-3 mm, clublike, not resembling the bisexual florets, at a sharp angle to the rachilla.

3-5 mm long, about 1 mm wide, 1-5-veined;

upper glumes 3.3-7 mm long, 1-2 mm wide, 3-5-veined;

lemmas 3.5-6 mm, scabridulous, sometimes hairy, distal hairs longer than those below, 7-veined, veins inconspicuous, apices rounded to emarginate, unawned or awned, awns 1-2 mm;

paleas slightly shorter than the lemmas;

anthers 1.5-2.5 mm;

rudiments 0.5-4 mm, clearly distinct from the bisexual florets, shorter than the terminal rachilla internode, truncate to acute.

= 18.

=18.