74 
A smaller number of species thrive under drier, usually northern 
climates. In a Report of the Interstate Park Commission it is 
stated that conifers in general have not succeeded well in the 
Bear Mountain region of New York, hot summers and absence 
of snow cover in winter being in general unfavorable to these 
plants. Nevertheless a number of collections exist in the New 
York region, where many species of conifers have succeeded. 
Even under our city conditions a number of species have grown 
well, in particular eight or ten species of pine, also Atlas cedar, 
Serbian spruce, Nikko fir, junipers, and Japanese yew. 
In the spring, with Dr. and Mrs. Reed and Mr. Caparn, I 
visited the Montgomery collection of conifers at Coscob, Con- 
necticut. What especially interested me was the growing of 
conifers between large oaks, giving partial protection from sun 
and wind. A gift of conifers was made by the Princeton Nur- 
series, and a number of small plants have been assembled in our 
nursery. Somewhat revised plans for our conifers have been 
made with the expectation that our collection may be consid- 
erably increased, even though this may mean occasional replace- 
ment of certain species. 
LILACS 
The identification of our lilacs is now in approximate order. 
Carefully prepared maps and records have been made by Mr. 
Emil Barens, W. P. A. worker. I have given attention to the 
classification of varieties, in particular to making a key to Syringa 
vulgaris varieties, of which we now have about one hundred and 
fifty. We have about sixteen species of lilacs; about twenty 
varieties and hybrids of lilac species other than Syringa vulgaris. 
I again visited repeatedly the Havemeyer collections. The size 
and shape of clusters, their density, the size of flowers, are char- 
acteristics of greater permanence than color. These have been 
utilized in the following classification, intended to be an improve- 
ment on the one printed here two years ago. 
Syringa vulgaris varieties 
Singles Doubles 
White 
Alba virginalis Group Edith Cavell Group 
(flowers small) (cluster open) 
Vestale Group Jeanne d’Arc Group 
(flowers large) (cluster dense) 
