Flora of North America species comparison

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

50-250 cm, erect or decumbent, rooting or not 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 2-18 spikelike primary branches, these digitate or with rachises to 6 cm;

primary branches 5-25 cm, axes wing-margined, wings about as wide as the midribs, bearing spikelets in unequally pedicellate pairs;

secondary branches rarely present;

shorter pedicels 0.2-0.3 mm;

longer pedicels 1-1.5 mm.

2.4-3.5 mm, homomorphic, ovate.

homomorphic, 2.5-3.5 mm long, 0.7-0.9 mm wide, lanceolate.

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.

0.2-0.5 mm, acute to truncate;

upper glumes (1.2)1.6-2.3 mm, from 1/5 as long as to almost equaling the spikelets;

lower lemmas 2.5-3.5 mm, 7-veined, veins unequally spaced, midvein and lateral veins scabrous at least on the distal 1/2, margins and region between the inner 2 lateral veins with straight, yellowish, 0.6-1 mm hairs;

upper lemmas gray to tan at maturity.

sheaths glabrous or variously pubescent (pilose, rarely tomentose or with papillose-based hairs);

upper sheaths glabrous;

ligules 0.8-2.5 mm;

blades 6-15(30) cm long, 3.5-8.5(13) mm wide, glabrous adaxially, rarely hirsute, with papillose-based hairs basally, margins scabridulous.

= 70, 72.

= 18, 34, 36, 45, 54, 72(?).