Complimentary 
NEW SERIES VOL. II 
NO. 13 
ARNOLD ARBORETUM 
HARVARD UNIVERSITY 
BULLETIN 
OF 
POPULAR INFORMATION 
JAMAICA PLAIN. MASS. JULY 19, 1916 
Summer-flowering shrubs. The flowers of many shrubs can now be 
seen in the Arboretum, and others will appear almost constantly until 
the late autumn or early winter when the Witch Hazels carry the 
period of blooming into another year. The last of the Azaleas the 
two white-flowered species of eastern North America, Rhododendron 
{Azalea) arborescens and R. {Azalea) viscosum, are now in bloom. A 
mass of the former can be seen on the right-hand side of the Valley 
Road in front of the Hickories, and Rhododendron {Azalea) viscosum 
can be seen in quantity on both sides of the Meadow Road. Azaleas 
of different species have been flowering continuously in the Arboretum 
since the middle of May, and the blooming of no other group of plants 
extends here over such a long period although that of the Viburnums 
and Cornels is almost as long. 
Rhododendron maximum. This native species is the last of the 
Rhododendrons with evergreen leaves to bloom, and it can now be seen 
on the left-hand side of the road entering by the South Street gate. 
This is one of the hardiest of all Rhododendrons in this climate and 
no other species which can be successfully grown here has such large 
and handsome leaves. The flowers are handsome in their delicate 
colors but are a good deal hidden by the young branchlets which make 
their growth before the buds open. 
Rosa Jackii. This beautiful Rose was introduced into the Arboretum 
from Korea several years ago by Mr. J. G. Jack for whom it is named. 
It is one of the Multiflorae Roses and has long stems which lie flat 
on the ground, lustrous foliage and pure white flowers in wide many- 
flowered clusters. The flowers have the delicate fragrance of the 
Musk Rose. The hybridizer should be able to find in it a good subject 
49 
