Some other plants in the Shrub Collection are now in their greatest 
beauty. Among these two yellow-flowered plants of the Pea Family, 
Cytisus capitatus and C. nigricans , are well worth attention, especially 
the latter which is a small, slender shrub with erect racemes of large 
flowers, and perhaps the most beautiful of the genus which can be suc- 
cessfully grown here. Colutea arborescens from southern Europe, and 
C. cilicica from Asia Minor, also of the Pea Family, are just now in 
great beauty, for they are still covered with their bright yellow flowers; 
and these are mixed with the large inflated pods developed from earlier 
flowers and now more or less deeply tinged with rose color. 
The first of the Hypericums to flower in the collection and one of 
the gems of the genus, H. Buckleyi, is now opening its flowers. It is 
a dwarf plant growing here only a few inches high but spreading into 
a broad mat which becomes covered with yellow flowers and as these 
remain in good condition for a long time, it is well suited for a sunny 
position in the rock garden. 
Attention is called again this year to the hybrid Lonicera Heckrottii 
which is now in bloom. The flowers, although not fragrant, are very 
beautiful, the outer surface of the corolla being deep rose color and 
the inner surface pale yellow, both buds and open flowers occurring to- 
gether in the same cluster. This is the only plant in the Arboretum 
which is really a continuous bloomer. Last year the first flowers 
opened at the end of June and flowers continued to open until November. 
The Yucca of the high plains at the eastern base of the southern 
Rocky Mountains, Y. glauca, is in bloom for the first time in the 
Arboretum. The Heather ( Calluna vulgaris ) with its numerous varie- 
ties is already opening its purple and white flowers and promises abun- 
dant bloom in the Shrub Collection and among the Rhododendrons at 
the base of Hemlock Hill. The latest of the Viburnums to flower and 
one of the most conspicuous plants now in bloom in the Arboretum is 
V. Caribyi. This is a magnificent plant in cultivation if sufficient space 
is given to it for free development when it will grow rapidly into a 
round-topped shrub ten or twelve feet high and broad. The last of 
the Rhododendrons ( R . maximum ) is now in flower, and the latest of 
the Azaleas (R. viscosum), the so-called Swamp Honeysuckle of our 
eastern coast region, is opening its fragrant white flowers. The Spice 
Bush, Clethra alnifolia, which has been largely planted in the roadside 
shrubberies, is still to flower. Only the earliest of the Linden trees 
have opened their fragrant flowers, and during several weeks the other 
species and hybrids of these handsome trees will be in flower. Other 
interesting trees will flower still later and will well repay weekly visits 
to the Arboretum. Of these late-blooming trees may be mentioned the 
North American Sorrel-tree, Oxydendrum arboreum , and the North 
American Hercules’ Club ( Aralia spinosa). These two trees are among 
the Laurels at the base of Hemlock Hill. The arborescent Aralia of 
eastern Asia {A. chinensis) and Acanthopanax ricinifolius of the same 
Family, with its large tropical looking leaves and great clusters of 
small white flowers are in the Aralia Group near the junction of the 
Meadow and the Bussey Hill Roads. Another tree still to flower is the 
Chinese Koelreuteria paniculata with its large erect clusters of bright 
yellow flowers and to be seen on the Meadow Road. Other Asiatic 
trees to flower are Sophora japonica and Maackia amurensis which 
are established with the other trees of the Pea Family on the right- 
hand side and near the Bussey Hill Road. 
These bulletins will now be discontinued until the autumn. 
