MORPHOLOGICAL STUDY OF THE FLOWER AND 
EMBRYO OF SPIRAEA. 
TRIBUTIONS FROM THE HULL BOTANICAL LABORATORY. 
ay XXX 
JONATHAN E. WEBB. 
(WITH TWENTY-EIGHT FIGURES) 
fe material used in preparing this paper was obtained 
ely from the Washington Park greenhouse, Chicago. Speci-— 
of Spiraea salicifolia in various stages of development were: 
d from Grand crossing and East Chicago, Illinois, and 
Michigan. 
d these ridges are. the =f 
ich are shown i in section n fi, 
