Flora of North America species comparison

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

60-100 cm, erect.

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.

villous, particularly the lower sheaths;

ligules 0.2-0.4, fimbriate;

blades to 47 cm long, 1-2.1 mm wide, involute, glabrous and smooth abaxially, scabrous adaxially, sometimes with a few long hairs near the base.

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.

of 2-3(5) spikelike primary branches on elongate rachises;

primary branches 8-13(20) cm, narrowly winged, wings no more than 1/2 as wide as the midribs, bearing spikelets in unequally pedicellate groups of 3-4(5);

secondary branches rarely present;

longest pedicels to 5 mm.

2.4-3.5 mm, homomorphic, ovate.

1.7-2.3 mm, elliptical, glabrous.

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.

absent;

upper glumes 0.9-1 mm, less than 1/2 as long as the spikelets, 3-veined, glabrous, broadly rounded to truncate;

lower lemmas slightly shorter than the spikelets, 5-veined, glabrous;

upper lemmas smooth, brown when immature, dark brown at maturity.

= 70, 72.

= unknown.