REVISION OF RUMEX. 83 
middle; valves 5 to 8 mm. in diameter, orbicular 
or broader than long, conspicuously cordate, erose or 
obtusely low dentate below, round or bluntly short acu- 
minate at apex; callosities solitary (exceptionally wanting 
or a second or third developed), globose, smooth, rarely 1 
mm. long ; achene 2x3.5 mm. — Sp. i. (1753), 333; Meis- 
ner, DC. Prod. xiv. 51. — Introduced along roadsides and 
in fields at various points in the Atlantic States, from 
Europe, where it is cultivated for its acid foliage ; possibly 
escaped from German kitchen gardens in its American 
stations. — Specimens examined from Saskatchewan (Ma- 
coun, 1872, 1030), Ontario (Macoun, 1874), Ver- 
mont (Jesup, 1873), Massachusetts (Hitchcock, 1829; 
Tuckerman; Jesup), New York (/lowe; Brown, 1879, on 
ballast ), New Jersey ( Schrenk, 1879, and Martindale, 1880, 
on ballast), Pennsylvania ( Martindale, 1882), Wisconsin 
( Trelease, 1887), Iowa ( Hitchcock), Kansas (/ellerman), 
and Utah (Jordan Valley, Watson, 1869, 1050), —the 
last named locality quite out of the usual range, but the 
plants scarcely anything else. — Plate 20. 
9. R. Brirannica, L. — Three or four feet high, erect, 
stout, at length considerably branched; leaves glabrous, 
little undulate, ample or the lowest very large, elliptical to 
ovate lanceolate, decurrently rounded or commonly acute 
at base, the apex very gradually pointed; panicle few 
leaved, ample, rather dense in fruit; whorls rather dense, 
remote but at length overlapping; pedicels about twice as 
long as the fruit, very obscurely and not tumidly jointed 
toward the base; valves 4x4.5 to 5x6 mm., round ovate, 
scarcely cordate, remotely erose or low-denticulate, obtuse, 
their lower veins sometimes much thickened at base ; callosi- 
ties 3, subequal, broad and low, sometimes wrinkled on the 
sides, more than half as long ; achene 1.7x3.5mm.— Sp. i. 
(1753), 334; Gray. Proc. Amer. Acad. viii. 399.— R. 
orbiculatus, Gray, various editions of the Manual.—Swamps, 
New Brunswick to the Lakes, south to New Jersey, Illinois, 
