Flora of North America species comparison

to 120 cm tall, bases long-decumbent and rooting at the lower nodes.

20-70 cm, erect;

nodes glabrous or pubescent.

with papillose-based hairs;

ligules 2.5-3.5 mm;

blades 4-28 cm long, 4-12 mm wide, scabrous, usually with some scattered papillose-based hairs on the base of the adaxial surfaces, sometimes with hairs all over.

mainly cauline;

sheaths glabrous or sparsely to densely pubescent, sometimes with papillose-based hairs;

ligules 0.5-2.2 mm, entire to lacerate;

blades 1.3-7.7 cm long, 1.5-4.7 mm wide, glabrous or sparsely to densely pubescent.

with 3-11 spikelike primary branches in 1-several whorls, rachises to 6 cm;

primary branches 5-15 cm, axes wing-margined, wings more than 1/2 as wide as the midribs, lower and middle portions bearing spikelets in unequally pedicellate pairs;

secondary branches absent;

shorter pedicels 0.3-0.8 mm;

longer pedicels 1.7-2.7 mm.

simple, 4.5-20 cm long, 5.5-31 cm wide, open;

branches divergent;

lower primary branches 3.6-17.7 cm, often with 1-several sterile branches near the base;

pedicels divergent, spikelets solitary.

2.4-3.5 mm, homomorphic, ovate.

2.3-3.3 mm long, 0.6-1 mm wide, narrowly elliptic.

absent or to 0.1 mm;

upper glumes 0.2-1.3 mm, 1/6 - 1/3 as long as the spikelets, 1-3-veined, margins and apices with appressed, white hairs about 0.5 mm, truncate or bilobed;

lower lemmas (5)7-veined, veins smooth or scabrous only over the distal 1/3, unequally spaced, margins and lateral intercostal regions silky-ciliate;

upper lemmas tan or gray when immature, brown at maturity, acuminate;

anthers 0.6-1.3 mm.

0.1-0.4 mm;

upper glumes 1.8-2.9 mm, 3-veined, densely pubescent between the veins, hairs white, becoming purple at maturity;

lower lemmas similar to the upper glumes in length, texture, and pubescence, 5-veined, veins equidistant;

upper lemmas 1.9-2.6 mm, glabrous, dark brown, narrowly acute;

anthers 0.3-0.5 mm, yellow, red, or purple.

1.3-1.6 mm.

= 70, 72.

= (36), 72.