30(3 Morphology of the Fruit of Sangiiinaria Canadensis 
" Capsule oblong, somewhat compressed, herbaceo-coriaceous, many-seeded, 
pointed by the short, persistent style, two-valved ; the valves separating from 
the replum formed by the intervalvular filiform placentae." 
Fig. 1. Diagram of fruit of Sangiiinaria, opened in the upper part on one side, showing two 
placentae with matured seeds and abortive ovules. 
I am unaware of any investigation of the embryological development of the 
ovary of Sanguincma. Until such data are available we shall not be able to say 
more concerning the morphology of the fruit than Gray did sixty years ago. The 
essential points to be remembered in the present work are the following. The 
fruit is borne on a slender pedicel sent up from the root-stalk. It is one-celled 
with two parietal placentae on which the seeds are arranged in two or three 
irregular rows. Judging by analogy with other ovaries whose embryology is 
known, it would seem probable that each placenta is composed of the margins 
of two distinct carpels. 
(b) Collection of Material and Gliaracters considered. 
In the spring of 1906 I collected at Meramec Highlands, near St Louis, Mo., 
a series of 1000 fruiting stalks of Sangiiinaria. At the time, the stalks seemed to 
have their full growth, so far as could be judged by general criteria, but the seeds 
were not fully mature. 
In the spring of 1907 another lot of fruits was secured from the same habitat. 
Only 400 were gathered, and in this case the peduncle was not taken. This 
second collection was made considerably later in the season than the first, and 
the fruits were sensibly larger, as will appear when the means of fruit lengths 
are considered. 
