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.

10-70 cm, decumbent, branching and rooting at the lower nodes;

nodes glabrous;

internodes glabrous or sparsely pilose distally.

mostly pubescent or glabrous, margins ciliate;

ligules 0.5-1.3 mm;

blades 2-15(27) cm long, 3-10 (12) mm wide, glabrous or pubescent;

margins scabrous, sometimes ciliate basally;

bases subcordate, not clasping the stems.

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.

2.5-13(22) cm, with 3-6(9) spikelike primary branches in 2 ranks;

primary branches 2-7 cm, ascending to reflexed, axes 0.7-1.2 mm wide, flat and narrowly winged, margins scabrous;

secondary branches absent;

pedicels shorter than the spikelets, 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.

3.3-3.8 mm long, 1-1.4 mm wide, solitary, appressed to the branches, 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 0.3-0.5 mm;

lower glumes 1.4-1.7 mm, 1/3 – 1/2 as long as the spikelets, 9-11-veined, glabrous;

upper glumes 2.7-3.4 mm, glabrous, 7-9-veined;

lower florets sterile;

lower lemmas 2.7-3.4 mm, glabrous, 5-veined, without evident cross venation;

lower paleas present;

upper lemmas 2.6-3.4 mm, apices rounded to acute, mucronate;

anthers 1.1-1.35 mm.

1.8-2 mm.

1.6-2.5 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, 54, 72, 84.