Flora of North America species comparison

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

nodes glabrous.

50-120 cm, branching and rooting at the lower nodes;

nodes glabrous.

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.

glabrous, margins ciliate;

ligules about 1 mm;

blades 5-15 cm long, 7-15 mm wide, glabrous, bases subcordate, margins scabrous.

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.

(5)9-18(25) cm long, 3-4 cm wide, with 4-10(15) spikelike primary branches in 2 ranks;

primary branches (1)2-5(10) cm, axes 0.5-2 mm wide, glabrous, margins scabrous;

secondary branches rarely present, pedicels shorter than the spikelets, mostly scabrous, apices with hairs.

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

solitary, appressed to the branches, in 2 rows.

(3)3.3-4.4 mm long, 1.4-1.7 mm wide, ellipsoid, solitary, imbricate, in 2 rows, appressed to the branches.

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 separated;

lower glumes 1.5-1.8 mm, glabrous, 5-veined, not clasping the base of the spikelets;

upper glumes 3.4-4.1 mm, glabrous, 7-veined;

lower florets staminate;

lower lemmas 3.4-4.1 mm, glabrous, 5-veined;

upper lemmas 2.7-3.5 mm long, 1.3-1.6 mm wide, apices rounded, incurved;

anthers 1.6-1.8 mm.

1.5-2.2 mm.

= 36.

= unknown.