Flora of North America species comparison

14-100 cm, not forming corms;

internodes smooth.

45-100 cm, not forming corms;

internodes sometimes scabridulous above the nodes.

glabrous or scabrous;

ligules 2.5-7 mm;

blades 1.2-3 mm wide, abaxial surfaces glabrous, scabridulous, adaxial surfaces puberulent.

glabrous or pilose;

ligules 0.5-1.5 mm;

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

5-25 cm;

branches 1-5 cm, appressed to reflexed, straight, with 2-9 spikelets;

pedicels sharply bent below the spikelets;

disarticulation below the glumes.

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.

6-8 mm, with 1 bisexual floret.

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

rachilla internodes 1.5-1.7 mm.

5.5-8 mm long, 1.8-3 mm wide, 5-veined;

upper glumes 5-8 mm long, 0.7-1.5 mm wide, 3-5-veined;

lemmas 4.5-8 mm, 9-15-veined, veins prominent, tuberculate, proximal portion with flat, twisted hairs, distal portion glabrous, chartaceous, apices emarginate to acute, unawned;

paleas about 3/4 the length of the lemmas;

anthers 1.5-3 mm;

rudiments 2-3 mm, obovoid or obconic, clublike, not resembling the 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.

= 18.

= 18.