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)40-200 cm, erect or decumbent;

nodes puberulent;

internodes pubescent, at least below the nodes.

usually with papillose-based hairs, margins shortly ciliate;

collars pubescent;

ligules 1-1.8 mm;

blades 7-24 cm long, 5-20 mm wide, softly pubescent on both surfaces, margins ciliate basally, scabrous distally.

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.

8-24 cm long, 1-3 cm wide, with spikelike primary branches in more than 2 ranks;

primary branches 1-8 cm long, 0.3-0.4 mm wide, appressed to ascending, axes triquetrous, pubescent, with some papillose-based hairs;

secondary branches present on the lower branches, short, appressed;

pedicels shorter than the spikelets, usually with papillose-based hairs distally.

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.

4.8-6 mm long, 1.8-2 mm wide, 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 2.4-3.2 mm, to 1/2 as long as the spikelets, 5-7-veined, glabrous or sparsely pubescent distally;

upper glumes 4-5.5 mm, glabrous or sparsely pilose, 7-9-veined;

lower florets staminate (sterile);

lower lemmas 4.7-6 mm, glabrous or sparsely pilose, 5-veined;

lower paleas present;

upper lemmas 3.6-4.1 mm long, 1.7-1.9 mm wide, apices acute, beaked;

anthers (1.6) 2.2-2.7 mm.

1.8-2 mm.

2-3 mm;

hilas linear, about 1/2 as long as the caryopses.

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.