the Meadow Road beyond the Horsechestnut Group where it is flowering 
profusely this year and seems able to resist the borer. One of the most 
interesting Locusts in the collection is a hybrid ( Robinia Holdtii ) between 
R. Pseudoacacia and the Rocky Mountain R. neo-mexicana which appeared 
in a Colorado nursery a few years ago. This is a vigorous tree with pale 
pink flowers and seems better able to resist the borer than either of its 
parents. The shrubby Rose Acacia (R. hispida) is less often attacked by 
borers and when in flower it is a beautiful and conspicuous plant. It is, 
however, sometimes troublesome as it spreads rapidly by underground 
shoots and so may occupy too much space. Another shrubby Robinia, 
R. Kelseyi , from the southern Appalachian Mountain Region where it 
was discovered a few years ago, flowers well in the Arboretum and is a 
desirable and handsome plant. The other arborescent species, R. viscosa, 
the Clammy Locust, and R. neo-mexicana suffer badly from the attacks of 
the borer. 
The first of the shrubby Hydrangeas to bloom, Hydrangea Bretschnei- 
cteri, is now in flower. It is a large and very hardy shrub from Man- 
churia and northern China, and in this climate is one of the most satisfac- 
tory plants in the genus. It can be seen in the Shrub Collection, and 
with it is now flowering for the first time in the Arboretum a variety of 
the species (var. setchuenensis) discovered by Wilson in western China. 
Indigofera Kirilowii, a low shrub from Manchuria and Korea, with 
racemes of pea-shaped pink flowers, is blooming in the Shrub Collection 
and on Hickory Path, near Centre Street, and is a hardy and handsome 
garden plant although little known in the United States. Another 
charming plant of the Pea Family, Sophora viciifolia, has been flowering 
also on Hemlock Path. This is a shrub two to four feet high with small 
pinnate leaves and showy blue and white flowers. It is a native of cen- 
tral and western China and appears to be perfectly at home in the Arbor- 
etum. 
Clematis tangutica y which can be found on one of the trellises on the 
east side of the Shrub Collection, is beginning to open its flowers and will 
continue to open them for several weeks; they are vase-shaped and bright 
clear yellow, and as they fade are succeeded by heads of fruits with long 
glistening hairy tails. As the flowers open gradually during several 
weeks flowers and fruits appear on the plant at the same time. This 
Clematis is a native of the extreme western part of China and is one of 
the best of the hardy vines of recent introduction. 
The flame- colored Azalea (. Rhododendron calendulaceum) has been 
largely planted on the long slope below Azalea Path and in many of 
the Arboretum shrubberies, and, although it usually flowers abundantly, 
this year it has been exceptionally beautiful. Among the seedlings 
raised at the Arboretum there are plants with flowers of many shades 
of yellow and orange. Flowering rather later is another Rhododendron 
of the same region R. arborescens; the flowers of this shrub are pure 
white with bright red filaments and, if they are not so showy as those 
of the flame-colored Azalea, they are equally beautiful and much more 
fragrant. There are masses of this Azalea on each side of the Valley 
Road. The flowers of R. arborescens will be followed early in July by 
those of the Clammy Azalea (R. viscosum ), a common plant in New 
England swamps, especially in those near the coast, which at midsum- 
mer are made fragrant by its pure white flowers. For three months 
the different Azaleas of the eastern United States flower in succession 
