Flora of North America species comparison

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

40-90 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.

mainly cauline;

basal sheaths villous;

upper sheaths glabrous or sparsely to densely hirsute, hairs papillose-based;

ligules (1)1.5-4 mm, entire to lacerate;

blades 5-15 cm long, 1-4 mm wide, glabrous or sparsely pubescent.

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 (4)10-18 cm rachises;

primary branches 4-10 cm, usually divergent at maturity, varying to ascending, axes not wing-margined, bearing spikelets in unequally pedicellate pairs;

internodes (4.5)6-15 mm (mid-branch);

secondary branches rarely present;

shorter pedicels 2-2.5 mm;

longer pedicels 7-8 mm;

terminal pedicels of primary branches 7.4-20 mm.

2.4-3.5 mm, homomorphic, ovate.

homomorphic, 3.7-5.8 mm (including pubescence), 2.9-4.3 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.

0.3-0.5 mm;

upper glumes 2.4-3.5 mm (excluding pubescence), 3-veined, densely villous, hairs 1.5-4 mm, silvery-white to purple, spreading at maturity;

lower lemmas 2.8-4.2 mm (excluding pubescence), exceeding the upper lemmas by 0.8-2.2 mm, 5-veined and the veins equally spaced or 7-veined and the lateral veins closer to each other than to the central vein, margins densely villous, hairs 1.5-4 mm, silvery-white to purple, spreading at maturity, apices acuminate;

upper lemmas 2.6-3.2 mm, lanceolate, brown when immature, dark brown at maturity, acuminate.

= 70, 72.

= 72.