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.

20-150 cm;

nodes pubescent;

internodes with papillose-based hairs.

pubescent, lower sheaths pilose, upper sheaths with papillose-based hairs;

ligules 1-2 mm;

blades 3-30 cm long, (1.5) 3-20 mm wide, with scattered papillose-based hairs, margins scabrous.

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.

3-12.5 cm, with 2-6(15) spikelike branches in 2 ranks;

primary branches 2-10 cm, appressed to ascending, axes 0.8-1.4 mm wide, flat, winged, hispid, hairs not papillose-based;

secondary branches present;

pedicels shorter than the spikelets, scabrous, with 1-3 conspicuous hairs.

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)4-5 mm long, 1.5-2 mm wide, solitary (rarely paired), appressed to the branch axes, bases glabrous or with a tuft of hairs.

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 separated, rachilla internode between the glumes not pronounced;

lower glumes 2.7-3.3 mm, (1/2)2/3 - 3/4 as long as the spikelets, 3-veined, mostly glabrous but often with 1-3 conspicuous, stiff hairs emanating from the midvein at approximately mid-length;

upper glumes (3)4-5 mm, glabrous or pubescent, 5-veined;

lower florets staminate;

lower lemmas (3)4-5 mm, glabrous or pubescent, 5-veined, with or without a setose fringe along the margins;

lower paleas present;

upper lemmas 2.2-2.6 mm, apices rounded, shortly awned, awns 0.5-1.2 mm;

anthers 1.2-1.5 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.

= 18, 36.

= 30, 42.