Three blue-fruited American Viburnums, V. dentatum, V. venosum 
and V. Canbyi, will not be in bloom for some time, the latest of them, 
V. Canbyi , carrying the flowering of these plants to midsummer, so 
that the flowers of American Viburnums can be seen in the Arboretum 
from the middle of May to the middle of July. 
One of the latest of the Bush Honeysuckles, Lonicera Maackii, is 
in flower in the Shrub Collection. This is a tall, narrow plant with 
dark green leaves. The flowers are white and larger than those of 
any of the Bush Honeysuckles, and are very handsome. The small 
bright red fruit remains on the branches until the beginning of winter 
and long after the leaves have fallen. This shrub, which comes from 
the region of the Amoor river, in eastern Siberia, is perfectly hardy 
and an exceedingly valuable decorative plant which well deserves a place 
in all collections of hardy shrubs. The variety of this species, (var. 
podocarpa) from western China flowers a few days later than the north- 
ern plant; the flowers are smaller and less beautiful, but the fruits 
are larger, and, ripening before the leaves lose their summer green, 
make the plant attractive in the late autumn. 
Some species of Mock Orange (Philadelphus) are already flowering. 
The earliest to bloom in the collection is P. Schrenkii var. Jackii, a 
plant discovered by Mr. Jack in Korea a few years ago. It is a hardy 
shrub with erect stems and rather small flowers. P. hirsutus from the 
southern Appalachian region and P. tenuiflorus from eastern Siberia 
are also in bloom. There is a large collection of species, varieties and 
hybrids of Philadelphus in the Arboretum. They are planted in the 
Shrub Collection and in a supplementary collection forming a large 
group on the Bussey Hill Road opposite the Lilac Group. Many use- 
ful hardy shrubs with beautiful flowers are found among these plants 
which will be in bloom now for several weeks and will repay careful 
study by persons interested in such plants. 
In great beauty now are Aesculus carnea Briotii and A. georgiana 
in the Horsechestnut Group; Lonicera Korolkovii and its hybrids and 
varieties in the Shrub Collection; the lovely blue and white flowered 
Sophora viciifolia on Hickory Path near Centre Street; the two new 
Chinese Cotoneasters in the Chinese Shrub Collection on the south side 
of Bussey Hill, C. hupehensis, C. divaricata and Syringa villosa , S. 
Julianae , and the hybrid S. Lutece in the Lilac Group. 
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, at the Old Cor- 
ner Bookstore, Bromfield Street, Boston, and at the office of the Harvard 
Alumni Bulletin, 50 State Street, Boston. Price, 30 cents. 
The Arboretum will be grateful for any publicity 
given these Bulletins. 
