258 "BOTANICAL GAZETTE [SEPTEMBER 
C. laciniosa and C. ovata, as I believe, they are the only hybrids 
between two species of Eucarya which have been noticed, other 
hybrids of Carya having been produced by the crossing of 2 species 
of A pocarya or of a species of A pocarya with a species of Eucarya. 
In the case of other hybrids of Carya only a single tree or single 
trees in different locations have been noticed. The hickory trees 
in western New York, however, have been more carefully examined 
by Mr. DunBar and his associates than the hickories in any other 
part of the United States. When the trees in other parts of the 
country are as carefully and intelligently studied, it is possible that 
many hybrid hickories and many individuals of these hybrids will 
be found, just as in recent years many hybrid oaks often with 
numerous individuals have been found. 
ARNOLD ARBORETUM 
JAMAICA PLaIN, Mass. 
