Flora of North America species comparison

50-200 cm, glabrous;

lowest internode plus sheath about 3.5 mm thick.

27-49 cm, glabrous;

lowest internode plus sheath 3-8 mm thick.

ciliate on the lower margins;

auricles 0.2-1.5 mm;

ligules 0.3-1.5 mm;

blades 2-6.5 mm wide, generally convolute, adaxial surfaces with 1-8 ribs, ribs rounded, prominent, spinulose, margins usually thinner than the ribs.

glabrous;

auricles absent;

ligules 0.5-1.5 mm;

blades 2-4 mm wide, convolute, abaxial surfaces glabrous, adaxial surfaces scabrous to densely pubescent, with 3-8 ribs, ribs narrow, prominent, margins not conspicuously thickened.

10-42 cm, erect;

internodes 9-19 mm;

rachises glabrous, not disarticulating at maturity.

4-55 cm, erect;

internodes 12-28 mm;

rachises glabrous;

disarticulation in the rachises.

13-30 mm, with 6-12 florets;

disarticulation beneath the florets.

14-30 mm, appressed to the rachises, with 4-8 florets.

oblong, glabrous, 5-9-veined, midveins about equal in length and prominence to the lateral veins, margins about 0.5 mm wide, hyaline, apices truncate;

lower glumes 6.5-10 mm, midveins occasionally scabrous distally;

upper glumes 7-10 mm;

lemmas 9-12 mm, glabrous;

paleas 7.5-11 mm, keeled, keels ciliate;

anthers 4-6 mm.

lanceolate, glabrous, midveins slightly longer and more prominent than the lateral veins, apices obtuse to acute, often mucronate, margins not hyaline;

lower glumes 10-18 mm, keeled, keels prominent;

upper glumes 9-16 mm;

lemmas 10-17 mm long, 2-4.5 mm wide, glabrous;

paleas 9-14 mm, keels ciliate for almost their entire length;

anthers 6-12 mm.

= 69, 70.

= 42, 56.