94 MISSOURI BOTANICAL GARDEN. 
writers on American botany. — Wet sand along the sea- 
coast of the northern Atlantic States, about salt springs at 
various points in the interior, and on river banks, beaches, 
etc., across British America, extending southward to Illinois, 
southern California and Mexico.—Specimens examined from 
various points in British America, and from Massachusetts, 
Rhode Island, New Jersey, Wisconsin, Illinois, Iowa, 
Nebraska, Dakota, Montana, Idaho, Yellowstone Park, 
Colorado, New Mexico, Nevada, California, Oregon and 
Washington. — Plate 32. 
The usual form, with narrow collosities and much 
elongated bristles, differs from the European R. maritimus 
only in the frequent wavy margin and obtuse base of the 
leaves and the occasional development of a third bristle on 
each side of the valves; and a few sea-shore specimens 
apparently belong to the normal form of the latter. If it 
is kept apart from the European plant, it must bear the 
name here employed, and I am inclined to think that it is 
as distinct as most Old World species of the maritimus 
group. But in any event, if precedence on a given page is 
held to establish the priority of one name over another, 
persicariotdes has precedence over maritimus. 
fh. crispatulus, Michx., Fl. i. (1803), 217, is the form 
with broadest most wavy leaves, more naked inflorescence, 
and larger valves, only two of them bearing unequal 
callosities ; but a study of the many forms growing inter- 
mingled about St. Louis, has not shown the wisdom of 
maintaining it even as a variety. 
A specimen from Washington (Suksdorf, 1889, 943), 
has nearly entire valves, but the usual form occurs under 
the same number ; anda very similar plant is 2. salicifolius, 
var. (?) of Watson, Bot. King. 314, from Nevada ( Wat- 
gon, 1868, 1052). 
R. BUCEPHALOPHORUs, L. — Annual, a span or two high, 
spreading, slender, simple or with few subequal branches, 
glabrous and apparently somewhat glaucous ; leaves scarcely 
