Flora of North America species comparison

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

40-100 cm, erect, sometimes geniculate, not rooting, at 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.

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 4-10 spikelike primary branches on 5-10 cm rachises, rarely with secondary branches;

primary branches 3-6 cm, appressed to ascending, axes not wing-margined;

internodes 2-5.5 mm (midbranch), bearing spikelets in unequally pedicellate pairs;

secondary branches rarely present;

pedicels not adnate to the branch axes;

shorter pedicels 0.1-0.3 mm;

longer pedicels 1-2 mm;

terminal pedicels of branches 1.7-6(7) mm.

2.4-3.5 mm, homomorphic, ovate.

homomorphic, (3.7)4-7.5 mm (including pubescence), 3-5.4 mm (excluding pubescence).

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.

0.4-0.6 mm;

upper glumes 2.5-5.1 mm (excluding pubescence), narrower than the upper florets, 3-veined, densely villous, hairs 1.5-5 mm, silvery-white to purple, widely divergent at maturity;

lower lemmas 2.7-5 mm (excluding pubescence), pubescence exceeding the upper florets by 2.2-4 mm, 7-veined, veins unequally spaced, only the 3 or 5 central veins visible, margins and outer lateral veins densely pubescent, hairs 1.5-5 mm, silvery-white to purple, widely divergent at maturity, intercostal regions glabrous, apices attenuate (acuminate);

upper lemmas 2.5-3.4 mm, ovate-lanceolate, brown to dark brown, acuminate.

1.3-2 mm.

sheaths villous;

upper sheaths glabrous, densely villous or densely tomentose, or sparsely to densely hairy, with papillose-based hairs;

ligules (1)1.5-6 mm, entire or lacerate, not ciliate;

blades 2-12(18) cm long, 2-5(7) mm wide, glabrous or the adaxial surfaces sparsely to densely villous or tomentose.

= 70, 72.

= 36, 54, 70, 72.