Flora of North America species comparison

55-100 cm, not forming corms;

internodes smooth, basal internodes not thickened.

45-100 cm, not forming corms;

internodes sometimes scabridulous above the nodes.

often scabrous on the keels, otherwise smooth;

ligules 1-7 mm;

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

glabrous or pilose;

ligules 0.5-1.5 mm;

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

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.

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.

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.

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

rachilla internodes 1.5-1.7 mm.

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.

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.