222 MONOGRAPH OF THE GENUS PYROLA. 
flowers disposed in racemes. The second division consists 
of such as have the valves of their capsule beginning to 
open first at the top, and their margins unconnected by any 
kind of tomentum ; with verticillate leaves ; flowers solitary^ 
or corymbose. This division contains only four species, 
subdivided into two sections. To the first section belongs 
P. imiflora ; and to the second belong P. umbellata^ ma- 
culata, and a new species P. Menziesii. These three last 
constitute the genus Chimaphila of Puesh, the Chhnaza 
of Mr Brown. I have, however, preferred considering 
them as a section rather than a distinct genus. They differ 
chiefly from the other species by their stipitate filaments, 
by the valves of their capsule opening first at the top, 
with their margins destitute of the connecting tomentum, 
and the lobes of the receptacle being bipartite : these two 
last characters they have in common with P. uniflora. 
The style, which, in P. umbellata, is immersed in the 
germen, is very short in maculata, so as to be just 
distinguished from it; but, in P. Menziesii, which is 
Very nearly related to the last, it is perfectly distinct 
from the germen. Their general habit has been much 
insisted on as a j ust reason for their separation ; but this 
difl'erence in habit is not near so striking in them as in P. 
uniflora and apliylla, and yet the flowers of the latter are 
so like those of the rotundifolia, that unless for a slight 
difference in the laciniag of the calyx, they might readily 
be confounded. 
The species of this genus are extensively diffused through 
the northern Hemisphere. In the Temperate Zones they are 
chiefly met with in mountainous situations, some of the spe- 
cies, such as P. uniflora and secunda, extending to consider- 
able elevations : in the Frigid Zones, on the contrary, they 
are only to be founid in the lowest and narrowest plains ad- 
jacent to the sea, and are never met with in these regions 
