REVISION OF RUMEX. 93 
deltoid or almost 3-lobed sharply toothed valves. It is 
found also in other localities, and may usually be recognized 
from a distance owing to the ragged appearance of the 
inflorescence, only a small percentage of the flowers en- 
larging (and fewer yet developing seed), so that the fruit- 
ing valves appear abnormally large by contrast, while they 
persist after the falling of the undeveloped flowers. 
So far as I can determine, this is R. acutus, L. = Kf. 
pratensis, M. & K., which occurs throughout northern Ku- 
rope (where it is often sterile ), and is now generally admitted 
to be a hybrid of the two species named. Related but dis- 
tinguishable hybrids are the Scandinavian £2. conspersus, 
Hornem., 2. platyphyllos, F.W. Aresch., and 2. propinguus, 
J. E. Areschoug, —on all of which see F, W. Areschoug 
in Ofvers. K. Vet. Akad. Férh., 1862, 57-76 with plate 3. 
American specimens have been examined from numerous 
localities in and about St. Louis, Mo., Belleville, Ill., North 
Manitou Isl., L. Mich. (Jfrs. Wislizenus), Ithaca, N. Y. 
(Dudley, 1883, 114), Amherst, Mass. (Jesup, 1871), and 
Washington, D. C. ( Ward, 1884).—-. Plate 31. 
19. R. persicarrompes, L.— Annual, a span to mostly 
a couple of feet high, slender to thick but soft stemmed, 
the larger plants branching from the base and often pros- 
trate and rooting at the nodes, soon fistulous, subglabrous 
to mostly papillate-villous; leaves pale green, usually un- 
dulate, the largest 3x18 cm., lanceolate, mostly acute, the 
base commonly truncate, rounded or subcordate, papillate 
beneath on the principal veins ; panicles leafy, axillary and 
terminal, the very dense whorls crowded to quite remote ; 
pedicels capillary, scarcely twice as long as the fruit, tumidly 
jointed at base; valves 1.5x2.5 mm., equalled in length by 
the 2 or 3 bristle-form teeth on each side, the apex acutely 
produced but not bristle tipped; callosities 3, subequal, 
smooth, .3 to .4 mm. broad, compressed from the sides, 
nearly as long as the body of the valve; achene RON 
mm.— Sp. i. (1753), 335. — &. maritimus of most recent 
