Flora of North America species comparison

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

20-30 cm, decumbent and rooting at the nodes;

nodes glabrous.

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.

mostly glabrous, throats with papillose-based hairs;

blades 4-7 cm long, 3-6 mm wide, glabrous.

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, if more than 2, rachises 7-20 mm and the branches racemose;

primary branches 3-6 cm, terminal branch erect, the other(s) usually divergent, axes wing-margined, wings wider than the midribs, bearing spikelets in unequally pedicellate groups of 3 on the basal and mid-portions;

secondary branches rarely present;

shortest pedicels about 0.05 mm;

middle pedicels about 0.1 mm;

longest pedicels 0.2-0.3 mm, adnate to the branch axes basally;

axillary panicles not present.

2.4-3.5 mm, homomorphic, ovate.

homomorphic, 1.5-1.7 mm, lanceolate.

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 almost equaling the upper lemmas, conspicuously 3-veined;

lower lemmas slightly longer than the upper lemmas, 7-veined, veins unequally spaced, all the intercostal regions sparsely hairy, hairs about 0.3 mm;

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

= 70, 72.

= unknown.