Complimentary 
NEW SERIES VOL. Ill 
NO. 10 
ARNOLD ARBORETUM 
HARVARD UNIVERSITY 
BULLETIN 
OF 
POPULAR INFORMATION 
JAMAICA PLAIN, MASS. JUNE 23. 1917 
Deutzias. If all the species and hybrids of Deutzias are considered 
this genus is not a great success in this region where many of the 
plants are not hardy and others only flourish in exceptionally sheltered 
and favorable conditions. As is usually the case, the Deutzias in the 
Shrub Collection suffered last winter, and although none of the plants 
were actually killed, with few exceptions they have been killed back 
to the ground, or nearly to the ground, and will not flower. In the 
large supplementary collection in a bed among the Hickories, on a 
path leading from Hickory Path, the plants are in unusually good con- 
dition now, however, and many of them are in bloom or will bloom 
during the next month. Much attention has been paid to hybridizing 
species of this genus, and probably the most generally useful Deutzia 
for this region is a hybrid between the Japanese D. gracilis and the 
Chinese D. parvijlora. D. gracilis is a dwarf shrub with pure white 
flowers in erect or spreading racemes. This is an old and popular 
garden plant better worth growing in the southern and middle states, 
however, than it is in Massachusetts where the ends of the branches 
are often more or less killed. Deutzia parvijlora is a large, vigorous 
and hardy shrub with flowers in compact, many-flowered corymbs. It 
is a native of northern China and Mongolia. The hybrid between these 
two species was made by the French hybridizer Lemoine many years 
ago and has been called D. Lemoinei. It is a large shrub sometimes 
five or six feet high and broad which covers itself with large broad 
clusters of pure white flowers. Handsome and more compact forms 
of this hybrid are varieties compacta, Boule de Neige, Avalanche, and 
Candelabre. These are now all in bloom, and in this group Boule de 
Neige is perhaps the most beautiful. 
Some of the varieties of another of the Lemoine hybrids called D. 
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