Complimentary 
NEW SERIES VOL. HI 
NO. 17 
ARNOLD ARBORETUM 
HARVARD UNIVERSITY 
BULLETIN 
OF 
POPULAR INFORMATION 
JAMAICA PLAIN, MASS. NOVEMBER 6, 1917 
Broad-leaved Evergreens. The number of varieties of these plants 
which can be successfully grown in eastern Massachusetts is very small, 
and the botanical explorations of the last quarter of a century have 
made only a few additions to the list. Moreover, it is not probable 
that further exploration will greatly increase the number of these 
plants which can be grown in this climate, and probably the only hope 
of increasing it is in the production of new races of hardy Rhododen- 
drons. A large portion of the broad-leaved evergreens which are hardy 
in the northern states belong to the Heath Family and cannot grow in 
soil impregnated with lime, so that the number of these plants avail- 
able for the gardens of the middle west is confined to species of only 
three or four genera. Of the plants introduced from China only one 
or two Rhododendrons, four Barberries, a Viburnum, and possibly a 
Gaultheria can be kept alive here in the open ground, and the perma- 
nent value of some of them is not yet assured. 
Evergreen Barberries. The four species of evergreen Barberries 
which are growing in the Arboretum are Berberis Julianae, B. verru- 
culosa, B. Gagnepainii, B. Sargentiana. The last is the least hardy 
of these four plants and it can be kept alive here only in exception- 
ally sheltered positions, and, judging by our experience with it in the 
Arboretum, it will never become a good garden plant in this climate. 
Of B. Julianae there are a number of plants here in exposed positions 
where they have been growing for several years and have not suffered 
from heat or cold. It is a tall shrub with pale branches and spines, 
thick, dark green leaves, clusters of yellow flowers and blue-black 
65 
