only substitute for it. The best form is the var. vegetus which was intro- 
duced many years ago into the Arboretum from northern Japan. This 
form has broader leaves than the others, and flowers and produces its 
fruit more freely. 
The Mahonias, or evergreen Barberries of our northwestern coast and 
of Japan and the Himalayas, are not hardy here except in favorable posi- 
tions, and cannot be recommended for general cultivation; and of these 
plants we can depend only on the dwarf species of the Rocky Mountains, 
Berberis or Mahonia repens. This plant grows only a few inches high 
and the leaves are lighter green and less lustrous than the better known 
Oregon Grape, Berberis or Mahonia Aquifolium. 
Two little shrubs of the Celastrus Family must be included in this list. 
These are Pachystima myrsinites of the Rocky Mountains and Pachy- 
stima Canbyi of the mountains of West Virginia. The former is widely 
distributed and a common plant in its region. It grows to the height 
of from twelve to eighteen inches and its leaves resemble those of some 
of the forms of the Box. It is, however, less hardy here than its Virginia 
relative which in the Arboretum forms a broad mass of small leaves only 
a few inches high and does not suffer from full exposure to the sun. 
The different forms of the Box-tree of the Orient, Buxus sempervirens, 
except in exceptional positions, are not hardy in eastern Massachusetts, 
although west of Cape Cod many of them can be successfully grown, and 
only the little known Japanese species Buxus japonica seems really 
hardy here. 
This completes the short list of broad-leaved evergreens which can be 
grown in eastern Massachusetts unless the Heather, one or two species 
of Heath, the stemless forms of Yucca and the Chamaedaphne, or 
Leather Leaf, can be called broad-leaved evergreens. This last plant, 
which is common in northern swamps, holds some of its leaves until 
spring. Although it grows naturally in wet ground, it does well when 
transferred to drier situations. Among the evergreens might almost be 
inserted, however, Magnolia glauca. In the south this tree, which grows 
much larger there than it does in the north, retains its leaves until late 
into the spring, but here they do not lose their beauty and do not fall 
until December. 
An illustrated guide to the Arboretum containing a map showing the 
position of the different groups of plants has recently been published. It 
will be found useful to persons unfamiliar with the position of the differ- 
ent groups of plants. Copies of this guide can be obtained at the Admin- 
istration Building in the Arboretum, from the Secretary of the Massa- 
chusetts Horticultural Society, 300 Massachusetts Avenue, Boston, from 
The Houghton, Mifflin Company, 4 Park Street, Boston, and at the Old 
Corner Bookstore, Bromfield Street, Boston. 
The Arboretum will be grateful for any publicity 
given these Bulletins. 
