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.

50-120 cm, branching and rooting at the lower nodes;

nodes glabrous.

glabrous, margins ciliate;

ligules about 1 mm;

blades 5-15 cm long, 7-15 mm wide, glabrous, bases subcordate, margins scabrous.

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)9-18(25) cm long, 3-4 cm wide, with 4-10(15) spikelike primary branches in 2 ranks;

primary branches (1)2-5(10) cm, axes 0.5-2 mm wide, glabrous, margins scabrous;

secondary branches rarely present, pedicels shorter than the spikelets, mostly scabrous, apices with hairs.

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.

(3)3.3-4.4 mm long, 1.4-1.7 mm wide, ellipsoid, solitary, imbricate, in 2 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 separated;

lower glumes 1.5-1.8 mm, glabrous, 5-veined, not clasping the base of the spikelets;

upper glumes 3.4-4.1 mm, glabrous, 7-veined;

lower florets staminate;

lower lemmas 3.4-4.1 mm, glabrous, 5-veined;

upper lemmas 2.7-3.5 mm long, 1.3-1.6 mm wide, apices rounded, incurved;

anthers 1.6-1.8 mm.

1.8-2 mm.

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.

= unknown.