Flora of North America species comparison

to 5 m long, long-decumbent and rooting at the lower nodes, vertical portion 90-200(300) cm;

nodes villous.

15-120 cm, geniculate;

nodes glabrous or shortly pilose.

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.

10-25 cm long, 5-10 cm wide, pyramidal, with 10-30 spikelike branches in more than 2 ranks;

primary branches 2.5-8 cm long, 0.4-0.9 mm wide, ascending to divergent, axils pubescent, axes flat, glabrous or with a few papillose-based hairs, secondary branches present or absent;

pedicels shorter than the spikelets, scabrous, sometimes with 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.

2.6-3.5 mm long, 1-1.4 mm wide, mostly in pairs, in 2-4 rows, appressed to the branches, purplish to green.

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.

scarcely separate, rachilla internodes short not pronounced;

lower glumes 0.6-1.1 mm, 1/5 – 1/3 as long as the spikelets, glabrous, 0-1(3)-veined;

upper glumes 2.6-3.5 mm, glabrous, 5-(7)-veined, without cross venation;

lower florets staminate;

lower lemmas 2.6-3.3 mm, glabrous, 5-veined, without cross venation;

upper lemmas 2.3-2.8 mm long, 1-1.3 mm wide, apices rounded, mucronate;

anthers 1-1.5 mm.

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.

1.8-2 mm.

1-1.7 mm;

hila punctiform.

sheaths with papillose-based hairs, these more dense distally, margins ciliate;

collars pubescent;

ligules 1-1.5 mm;

blades 7.5-35 cm long, 4-20 mm wide, glabrous or sparsely pilose on both surfaces, margins scabrous.

= 18, 36.

= 18, 36.