Flora of North America species comparison

25-100 cm, decumbent, rooting at the lower nodes;

nodes glabrous.

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

nodes villous.

glabrous or sparsely pilose;

ligules 0.5-1 mm;

blades 2.5-17.5 cm long, 3-13 mm wide, glabrous or sparsely pilose, bases subcordate, not clasping the stems, margins ciliate basally, with papillose-based hairs.

6-16 cm long, 2-2.5 cm wide, with 2-8 spikelike primary branches in 2 ranks;

primary branches 3-8 cm, axils pubescent, axes 1.3-2.5 mm wide, flat, usually glabrous, occasionally pilose dorsally;

secondary branches rarely present;

pedicels shorter than the spikelets, scabrous and sparsely pilose.

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.

3.8-5 mm long, 2-2.5 mm wide, ovoid, bi-convex;

solitary, appressed to the branches, in 2 rows.

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.

scarcely separated;

lower glumes 1.2-1.8 mm, to 1/3 as long as the spikelets, obtuse, glabrous, 5(-7)-veined, not clasping the base of the spikelets;

upper glumes 3.2-4.7 mm, glabrous, 7(-9)-veined;

lower florets sterile;

lower lemmas 3.2-4.7 mm, glabrous, 5-veined;

lower paleas present;

upper lemmas 2.8-3.4 mm long, 1.8-2.3 mm wide, apices incurved, broadly acute to rounded, mucronulate;

anthers about 1 mm.

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.

1.5-2.2 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.

= 36.

= 18, 36.