328 PITTONIA. 
or ovate-oblong, smaller than the smallest of the very un- 
equal sepals, less than half as large as the largest of them: 
lobes of the corolla strongly pubescent at tip externally. 
Mountains of southern California. Remarkable for an 
almost complete transition between the small real bracts of 
the flower and the largest of the very unequal sepals. 
C. CAMPORUM. Firmly erect, from horizontal rhizomes, 
seldom more than 8 or 10 inches high, densely leafy, not at 
all twining: leaves from obovate-oblong to oblong, acute, 
very short-petioled, from nearly truncate to auriculate and 
subcordate at the narrowed base: lowest leaves with a sterile 
leafy branch in the axil, the few flowers appearing only in 
the axils of the next lowest leaves, these large, pure white. 
Common along the borders of the thickets, and also in 
open ground, throughout the prairie regions of northern 
Indiana, Illinois, Wisconsin, etc.; always heretofore mis- 
taken for C. spithamzus; but this last is a broad-leaved 
partly twining plant, with flowers borne near the middle of 
the stem. C. stans, of Michaux, is more related to our new 
species, yet again perfectly distinct from both. If it has the 
broad cordate leaves of C. spithamzus, it has the almost basal 
flowering, and the erect low growth of C. camporum ; but 
this new one is strongly characterized by the form of its 
leaves, as well as by their densely clothing the stem. 
C. AMERICANUS. C. sepium, var. Americanus, Sims, Bot. 
Mag. t. 732 (1804). In naming the reddish color of the 
flowers as the only notable peculiarity of the American 
plant, Sims might have done better. Pinkish flowers occur 
in true C. sepium of Europe; and while the white-flowered 
and genuine hedge bindweed doubtless exists as introduced 
in eastern North America, the native plant is also to be 
found, here and there, with white corollas. The American 
plant, so long known superficially, differs I think constantly, 
and specifically, not only in being more or less pubescent, but 
