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.

20-100 cm, decumbent, geniculate, branching and rooting at the lower nodes;

nodes glabrous.

mostly glabrous, except the margins ciliate, with papillose-based hairs;

ligules 0.5-1.5 mm;

blades 3-21 cm long, 6-20 mm wide, glabrous, bases subcordate to cordate, clasping the stems, margins sometimes ciliate basally.

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.

6-25 cm long, 2-7 cm wide, with 3-8 spikelike primary branches in 2 ranks;

primary branches 2-11 cm, axes 1-1.5 mm wide, flat, margins scabrous;

secondary branches absent;

pedicels shorter than the spikelets, glabrous or scabrous.

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.

(4)4.5-6 mm long, 1.9-2.2 mm wide, solitary, appressed to the branch axes, in 2 rows.

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.

separated by an internode of about 0.5 mm;

lower glumes 1.5-2.5 mm, to 1/3 as long as the spikelets, broadly ovate, glabrous, 9-11-veined;

upper glumes 3-4.2 mm, glabrous, 7(-9)-veined, without evident cross venation;

lower florets sterile;

lower lemmas 3-4.2 mm, glabrous, 5-veined;

lower paleas present;

upper lemmas 2.7-3.6 mm long, 1.5-2 mm wide, apices rounded;

anthers 0.7-1 mm.

1.8-2 mm.

2-2.5 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.

= 36, 72.