Flora of North America species comparison

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

nodes glabrous.

15-60 cm, erect or decumbent, sometimes 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 sometimes ciliate;

ligules 0.7-1.5 mm;

blades 4-15 cm long, 3-11 mm wide, usually glabrous, sometimes pubescent, 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.

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.

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

solitary, appressed to the branches, in 2 rows.

(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 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.

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.

1.5-2.2 mm.

= 36.

= unknown.