Complimentary 
NEW SERIES VOL. II 
NO. 7 
ARNOLD ARBORETUM 
HARVARD UNIVERSITY 
BULLETIN 
OF 
POPULAR INFORMATION 
JAMAICA PLAIN. MASS. JUNE 9. 1916 
The Arboretum in early summer. The Arboretum is never more in- 
teresting or more full of beauty than it is in the early days of June. 
The leaves of most of the deciduous-leaved trees have now attained 
their full size and this year, thanks to the abundant rains of the spring, 
they are unusually large and are not yet greatly disfigured by insects. 
The conifers are now covered with their new leaves and are more 
beautiful than at any other season of the year. The Arboretum is 
still full of flowers for this is the time when several American Vibur- 
nums begin to bloom and some of them have been largely used in bor- 
der and roadside plantations. Late-flowering Lilacs are in bloom and 
will continue to open their buds during the month. The Rhododen- 
drons, although later than usual this year, already make a brave show; 
and the yellow-flowered American Azaleas are beginning to bloom be- 
fore all the flowers of the Japanese Azaleas have disappeared. Early 
Cornels, Roses and Mock Oranges are already in flower. A large num- 
ber of American and Old World Hav/thorns are covered with flowers, 
and many plants in the Horsechestnut Group are exceptionally fine 
this year. Many of the American Magnolias are still in full bloom, 
and in the Shrub Collection visitors can find the flowers of many 
shrubs, including those of many Barberries, to interest them. 
Viburnums. There are no small trees better suited for the decora- 
tion of American parks and roadsides than the three arborescent 
Viburnums of the eastern United States. The first of these to flower 
is V. prunifolium, the Black Haw of the middle states where it is a 
common arborescent shrub or small tree on rocky hillsides and in fence- 
rows, sometimes growing 30 feet high. It has rather narrower leaves 
than the other arborescent species from which it may be distinguished 
25 
