Flora of North America species comparison

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

35-140 cm, erect or decumbent, not rooting at the basal 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 3-15 spikelike primary branches, digitate or with rachises to 3 cm;

primary branches 5-25 cm, wing-margined, wings wider than the midribs, bearing spikelets in unequally pedicellate pairs;

shorter pedicels 0.5-1.5 mm;

longer pedicels 1.5-3 mm.

2.4-3.5 mm, homomorphic, ovate.

homomorphic, 2.8-3.5 mm, narrowly lanceolate to narrowly elliptic.

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, veinless, acute;

upper glumes 1.7-1.9 mm, wooly pubescent;

lower lemmas 2.5-3.5 mm, 7-veined, veins unequally spaced and smooth, occasionally the lateral veins scabridulous over the distal 1/4, margins and region between the 2 inner lateral veins appressed-pubescent, with 0.5-1.5 mm hairs;

upper lemmas gray when immature, becoming brownish at maturity;

anthers 1.2-1.6 mm, purple.

sheaths glabrous or pubescent, often densely so, hairs 4-6 mm, papillose-based;

ligules (1.8)3-5 mm, erose and ciliate;

blades 5-40 cm long, 3-6 mm wide, scabridulous, often also papillose-hairy.

= 70, 72.

= 36.