Flora of North America species comparison

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

40-90 cm, erect, unbranched, glabrous;

nodes 1-2.

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.

densely hairy, hairs papillose-based;

ligules 0.8-2.2 mm;

blades 10-24 cm long, 2-4.5 mm wide, with 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 2-3 spikelike primary branches on 4-7 mm rachises;

secondary branches rarely present;

primary branches (5)10-22 cm, axes 0.5-0.6 mm wide, not wing-margined, middle portions of the branches bearing spikelets in groups of 3;

pedicels appressed to the axes.

2.4-3.5 mm, homomorphic, ovate.

2.3-2.4 mm, lanceolate to oblanceolate-elliptic;

lower glumes absent;

upper glumes 1.4-1.5 mm, more than 1/2 as long as the spikelets, 3-veined, truncate to acute, mostly glabrous, apices sparsely hairy;

lower lemmas about as long as the spikelets, 7-veined, mostly glabrous, apices sparsely hairy;

upper lemmas 2.3-2.4 mm, dark brown to black, apiculate;

anthers 1-1.1 mm.

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.

= 70, 72.

= unknown.