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.

15-60 cm, erect or decumbent, sometimes rooting at the lower nodes;

nodes glabrous.

glabrous, margins sometimes ciliate;

ligules 0.7-1.5 mm;

blades 4-15 cm long, 3-11 mm wide, usually glabrous, sometimes pubescent, 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 cm, with 3-5 spikelike branches in 2 ranks, smooth or scabrous, glabrous or pubescent;

primary branches 2-6 cm, divergent to reflexed, axils glabrous, axes 1.1-1.6 mm wide, flat, winged, without papillose-based hairs, margins smooth or scabrous;

secondary branches rarely present;

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)3.8-4.9 mm long, 1.5-1.8 mm wide, ellipsoid, solitary, usually overlapping, appressed to the branch axes, pubescent or sometimes glabrous, in 2 rows, sometimes appearing 1-rowed.

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 1.9-2.7 mm, 9-11-veined, glabrous;

upper glumes 3.2-4.1 mm, 7-9-veined, glabrous or pubescent, margins glabrous or pilose, when pilose, the basal hairs shorter than the distal hairs;

lower florets sterile;

lower lemmas 3.1^1.7 mm, resembling the upper glumes in texture and pubescence, 5-7-veined;

lower paleas absent;

upper lemmas 2-4 mm, apices recurved, rounded, mucronate;

anthers 1.5-1.7 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.

= unknown.