Flora of North America species comparison

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

10-60 cm, occasionally branching from the lower nodes.

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.

3-4, clustered near the base;

sheaths usually glabrous;

ligules 0.5-1 mm;

blades 1.5-4 cm long, 3-5 mm wide, mostly glabrous, bases subcordate and ciliate, with 0.6-1 mm papillose-based hairs.

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.

with 2(-4) spikelike primary branches, digitate;

primary branches 2-5 cm, strongly divergent;

branch axes about 1 mm wide, wing-margined, wings wider than the central midribs, bearing spikelets in unequally pedicellate groups of 3;

secondary branches rarely present;

shortest pedicels about 0.3 mm;

middle pedicels about 1 mm;

longest pedicels 1.5-2 mm, adnate to the branch axes basally;

axillary panicles not present.

2.4-3.5 mm, homomorphic, ovate.

1.2-1.5 mm, elliptic or slightly obovate, acute.

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 equaling or almost equaling the spikelets, 5-veined, minutely pubescent between the veins and on the margins;

lower lemmas subequal to the upper glumes, 7-veined, usually pubescent on the margins and lateral veins, occasionally glabrous, hairs, if present, 0.2-0.4 mm;

upper lemmas about 1.2 mm, pale brown or pale gray, becoming light brown at maturity, acute;

anthers 0.8-0.8 mm.

= 70, 72.

= 18.