39 
Deutzia discolor is another fairly hardy species from central China 
with hemispherical clusters of white flowers which are three-quarters 
of an inch in diameter. The variety major of this species has rather 
larger flowers and is a larger and apparently a more vigorous plant. 
It can be seen with other Chinese species on the southern slope of 
Bussey Hill. 
Deutzia kalmiaeflora. Deutzia purpurascens is not hardy but by 
crossing it with D. parvijiora a hardy or nearly hardy plant has been 
obtained to which the name of D. kalmiaeflora has been given. This 
hybrid has carmine-colored flowers about three-quarters of an inch in 
diameter, in small compact clusters. When it does well this is one of 
the handsomest of the hybrid Deutzias. 
Deutzia Sieboldiana is a dwarf Japanese species with small white 
flowers and much less valuable as a garden plant than many of the 
other species. A hybrid {D. candelabrum) obtained by crossing it with 
D. gracilis is a handsome plant with gracefully drooping branches which 
are covered with elongated clusters of white flowers. 
Cornus controversa. This handsome Cornel, like the native Cornus 
alternifolia, has alternate leaves and wide-spreading branches, but the 
flower-clusters are broader; it blooms here a week or ten days earlier, 
and it is a much larger tree, as Wilson saw specimens in western 
China fully sixty feet high. It is a native of the Himalayan Moun- 
tains, western China and of Japan. The plants raised from the seeds 
collected by Wilson in China have proved perfectly hardy in the Ar- 
boretum where they are growing vigorously and are now in bloom in 
the supplementary Cornel collection in the rear of the Phellcdendron 
Group on the right-hand side of the Meadow Road. The largest plant 
in the Arboretum and probably the largest in the United States is also 
in flower in the nursery near the top of Peter’s Hill. This Cornel 
gives every promise of being a valuable ornamental tree in this climate. 
Laburnums. These plants in England, at least, are popularly called 
Golden Chain from their long drooping clusters of bright yellow flow- 
ers. In many European countries, especially in Great Britain, the 
Laburnums are among the most popular and most beloved garden 
plants, but are less commonly seen in this country. Laburnum ana- 
gyroides, better known as L. vulgare, has been more often planted 
here than the other species and varieties. It is a native of southern 
Europe and is a small tree usually from twenty to thirty feet high. It 
is not always perfectly hardy in Massachusetts, but occasionally large 
specimens can be seen in old gardens in the suburbs of Boston, and 
just now such trees are completely covered with flowers and are beau- 
tiful and impressive objects. There are several varieties of this La- 
burnum in the Arboretum collection and several of them are in bloom. 
The var. bullatum, often called var. involutum, has curled and con- 
torted leaves and is the least attractive of all the Laburnums. The 
var. quercifolium has sinuately lobed leaflets; var. pendulum has pen- 
dulous branches, and the var, semperflorum produces a second crop of 
flowers in the autumn. 
