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.

20-120 cm, geniculate or decumbent, usually rooting at the lower nodes;

nodes glabrous.

glabrous or glabrate, margins ciliate distally;

ligules 0.5-1 mm;

blades 2-20 cm long, 7-20 mm wide, glabrous.

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.

terminal and axillary, 5-18 cm long, to 1.4 cm wide, with 2-10 spikelike primary branches in more than 2 ranks;

primary branches 1.5-9 cm, appressed, axes 0.3-0.8 mm wide, triquetrous, scabrous;

secondary branches present or absent, if present, short, restricted to the lowest panicle branches;

pedicels scabrous, 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.

2.9-3.8 mm long, 1.2-1.4 mm wide, ellipsoid, apices abruptly acuminate, 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 1-1.4 mm, glabrous or pubescent, (3)5-veined, 1/3 or less as long as the spikelets;

upper glumes 2.8-3.7 mm, glabrous or pubescent, 5-7(9)-veined, cross venation not evident or evident only in the distal 1/2;

lower florets sterile;

lower lemmas 2.7-3.6 mm, glabrous or pubescent, 5-veined, usually without cross venation;

upper florets 2.1-2.9 mm long, 1.3-1.7 mm wide, broadly acute, mucronate;

anthers 1-1.2 mm.

1.8-2 mm.

1.2-1.8 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.

= 54.