40 
plants are covered with their small clusters of creamy white flowers. 
These later in the season will be followed by white, translucent fruits 
borne on bright red stalks. This Cornel blooms here with some of the 
native Roses and their pink flowers compose perfectly with the white 
flowers of the Cornel; and when these plants are used together, as along 
some of the Arborertum roads, delightful effects are obtained. 
June-flowering Hydrangeas. For a quarter of a century Hydrangea 
Bretschneideri, a native of northern China, has been a favorite plant 
in the Arboretum. It is a large and vigorous shrub with dark green 
leaves and flat heads of fertile flowers suncunded, as in other species 
of Hydrangea, by a ring of pure white ray flowers. The largest plant 
of this Hydrangea in the Arboretum ' is at Mr. Dawson’s house on 
Centre Street. Several of the Hydrangeas introduced by V7ilson from 
western China are now in flower in the collection of Chinese Shrubs 
on Bussey Hill and for the first time show their real value as garden 
plants in this climate. The tallest and most vigorous of these plants 
is Hydrangea Rosthornii, which is already eight feet high, with flower- 
clusters eight inches across. H. xanthoneura is closely related to H, 
Bretschneideri and can only be distinguished from it by a slight vari- 
ation in the shape of the leaves, and by the almost entire absence of 
hairs from their lower surface. . The plants are now covered with flow- 
er-clusters which are about eight inches across. Two forms of this 
Hydrangea, var. Wilsonii and var. setchuenensis are also in bloom, and 
as garden plants are as valuable as the species itself. 
Hydrangea petiolaris. There are now few handsomer plants in the 
Arboretum than the specimen of this climbing Hydrangea on the Ad- 
ministration Building, although the long-stalked white ray flowers 
which surround the clusters of fertile flowers are beginning to fall. 
There are about a hundred of the flower-clusters on the plant and 
many of them are eight or nine inches across and terminal on short 
lateral branchlets which stand out from the body of the plant and give 
it an irregular surface which adds to its beauty. This Hydrangea is 
certainly the best deciduous-leaved climbing plant which can be grown 
against brick or stone walls in this climate. 
Potentilla fruticosa Veitchii. This white-flowered form of the widely 
distributed yellow-flowered Cinquefoil is an excellent garden plant in 
this climate. It is dwarf in habit, blooms freely every year, and the 
plants are covered with flowers during several weeks. It can be seen 
in the general Shrub Collection and with the other Chinese shrubs on 
Bussey Hill. 
Potentilla tridentata is an excellent little rock garden shrub not often 
seen in cultivation. It is a native of eastern North America where, 
especially on the coast, it is common in rocky and exposed situations. 
The leaves are composed of three leaflets which are 'dark green and 
very lustrous, and the small white flowers are produced in several 
flowered-clusters standing well up above the plant on long stems. This 
is well established in the general Shrub Collection where it is now 
flowering. 
Lonicera saccata. By an unfortunate error *‘Lonicera pileata^* was 
printed on page 35 of the last of these Bulletins instead of Lonicera 
saccatUy the plant which was there described. 
