Flora of North America species comparison

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

80-120 cm, erect or decumbent and rooting at the lower nodes, not branching at the aerial 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.

hirsute, with papillose-based hairs, those of the innovation sheaths compressed-keeled;

ligules 1-2 mm;

blades 7-30 cm long, 3-5 mm wide, flat, pilose above and below.

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 6-8 spikelike primary branches on 4-6 cm rachises;

primary branches 8-13 cm, axes triquetrous, narrowly winged, wings less than 1/2 as wide as the midribs, lower and middle portions of the branches bearing spikelets in appressed, unequally pedicellate pairs;

secondary branches rarely present;

axillary inflorescences not present;

pedicels not adnate to the branch axes.

2.4-3.5 mm, homomorphic, ovate.

about 3 mm, elliptic lanceolate, 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 or minute and hyaline;

upper glumes 7-9-veined, glabrous or obscurely pubescent;

lower lemmas 7-9-veined, glabrous or obscurely pubescent;

upper lemmas elliptic, yellow or gray, becoming purple at maturity, slightly apiculate.

= 70, 72.

= unknown.