Flora of North America species comparison

55-100 cm, not forming corms;

internodes smooth, basal internodes not thickened.

30-100 cm, not forming corms;

internodes smooth.

often scabrous on the keels, otherwise smooth;

ligules 1-7 mm;

blades 2-5 mm wide, both surfaces glabrous, scabridulous.

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.

13-25 cm;

branches 1-9 cm, straight and appressed or flexible and ascending to strongly divergent, with 1-12 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.

8-16 mm long, 1.5-5 mm wide, parallel-sided when mature, with 2-5 bisexual florets;

rachilla internodes 1.9-2.1 mm.

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

green, pale, or purplish-tinged;

lower glumes 3.5-6 mm long, 2-3 mm wide, 3-5-veined;

upper glumes 5-8 mm long, 2-3 mm wide, 5-veined;

lemmas 6-10 mm, glabrous, chartaceous on the distal 1/3, 5-11-veined, veins conspicuous, apices rounded to acute, unawned;

paleas about 2/3 the length of the lemmas;

anthers 1-2.5 mm;

rudiments 1.8-5 mm, acute to acuminate, resembling the bisexual florets.

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.