Flora of North America species comparison

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

nodes glabrous.

20-150 cm;

nodes pubescent;

internodes with papillose-based hairs.

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.

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.

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.

3-12.5 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.

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

solitary, appressed to the branches, in 2 rows.

(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 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, 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.

1.5-2.2 mm.

= 36.

= 30, 42.