Flora of North America species comparison

15-120 cm, geniculate;

nodes glabrous or shortly pilose.

10-40 cm, erect to ascending, solitary or in small clumps;

nodes retrorsely villous;

internodes glabrous.

glabrous or hispid, margins ciliate;

ligules 1-1.5 mm;

blades 3-33 cm long, 5-20 mm wide, glabrous or sparsely pilose on both surfaces, margins smooth or scabrous;

collars pubescent.

glabrous or with papillose-based hairs;

ligules 0.5-1.5 mm;

blades 1-7(9) cm long, 2-5 mm wide, glabrous or pilose on both surfaces, margins ciliate basally, with papillose-based hairs.

5-15 cm long, 2-8 cm wide, simple, with 5-30 spikelike primary branches in more than 2 ranks;

primary branches 2-10 cm, appressed to divergent, axils glabrous, axes 0.3-0.5 mm wide, triquetrous, scabrous or sparsely pilose;

secondary branches usually present on the lower primary branches, pedicels scabrous and pubescent, shorter than the spikelets.

3-6 cm long, 0.5-1 cm wide, with 2-6 spikelike primary branches in 2 ranks;

rachises scabridulous;

primary branches 0.5-2 cm, appressed, axes 0.3-0.4 mm wide, triquetrous, scabridulous, glabrous or puberulent;

secondary branches rarely present;

pedicels shorter than the spikelets, scabridulous.

2-3.4 mm long, 1.2-1.8 mm wide, obovoid, yellowish to reddish-brown or bronze-colored at maturity, mostly paired, in 2-4 rows, appressed to the branches.

3-4.5 mm long, 1.5-2 mm wide, plano-convex, solitary, in 2 rows, appressed to the branch axes.

scarcely separate, rachilla internodes short, not pronounced;

lower glumes 1-1.5 mm, at least lA as long as the spikelets, glabrous, (1)3-5-veined;

upper glumes (2)2.2-3.1 mm, glabrous, 7-9-veined, cross venation evident throughout;

lower florets usually staminate, sometimes sterile;

lower lemmas 2-3.1 mm, usually glabrous, 7-veined, cross venation evident throughout;

lower paleas present;

upper lemmas 1.8-2.9 mm long, 1.1-1.7 mm wide, apices acute to rounded, mucronate;

anthers 1-1.6 mm.

scarcely separate, rachilla between the glumes not pronounced;

lower glumes 2.8-3.2 mm, 5-7-veined, glabrous or with long hairs basally;

upper glumes 3-4.5 mm, (9)11-13-veined, without cross venation, mostly puberulent, margins pilose-fringed;

lower florets staminate;

lower lemmas 3-4.5 mm, 7-9-veined, without cross venation, mostly puberulent, margins pilose-fringed;

lower paleas present;

upper lemmas 2.4-2.8 mm long, 1.3-1.4 mm wide, planoconvex, apices broadly acute to rounded, mucronate;

anthers about 1 mm.

1-1.7 mm;

hila punctiform.

1.8-3 mm.

= 18, 36.

= 36.