COMPLIMENTARY 
NEW SERIES VOL. X 
NO. 10 
ARNOLD ARBORETUM 
HARVARD UNIVERSITY 
BULLETIN 
OF 
POPULAR INFORMATION 
JAMAICA PLAIN, MASS. JULY 2, 1924 
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 favored positions. Much attention has been paid to hybridizing 
species of this genus, and probably the most useful Deutzia for this 
part of the world is a hybrid between the Japanese D. gracilis and the 
Chinese D. parviflora. Deutzia gracilis is a dwarf shrub with pure 
white flowers in erect or spreading racemes. This is an old and pop- 
ular 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. D. parviflora is a large, vig- 
orous and hardy shrub with flowers in compact, many-flowered corymbs. 
It is a native of northern China and Mongolia. A 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 some- 
times five or six feet high and broad which covers itself with large 
clusters of pure white flowers. Handsome and more compact varieties 
of this hybrid are the varieties compacta, Boule de Neige, Avalanche 
and Candelahre. Varieties of another of the Lemoine hybrids called 
Deutzia rosea sometimes flower well and promise to be good garden 
plants in sheltered positions. This hybrid was obtained by crossing 
D. gracilis and D. purpurascens; the latter has petals which are purple 
on the outer surface and is usually not hardy here. D. rosea and its 
varieties have flowers more or less tinged with purple. Another 
hybrid obtained by the same cross by Lemoine called D. myriantha 
has white flowers, and its varieties called Boule Rose and Fleur de Pom- 
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