other black-fruited evergreen Holly, Hex crenata, a native of Japan, is 
more often found in gardens. This is an upright growing plant some- 
times becoming a small tree, and varies considerably in the size of its 
leaves. It is hardy only in favorable positions, and during the last 
winter the plants with broad leaves suffered severely while the narrow- 
leaved plants were uninjured. This is interesting because the two forms 
were raised from seeds collected in one locality in Japan. A number of 
plants of Ilex crenata can be seen on Azalea Path. 
Large plants of the Golden Chain, Laburnum vulgare, are occasion- 
ally seen in the neighborhood of Boston where this handsome European 
tree has long been planted. It is not very hardy, however, and succeeds 
only in sheltered positions. A better plant for this region is the so-called 
Scotch Laburnum, Laburnum alpinum of the mountain region of cen- 
tral Europe. This is a large shrub or small tree blooming about two 
weeks later than Laburnum vulgare , and the bright yellow flowers are 
produced in longer clusters than those of the other species. It grows 
rapidly and is perfectly hardy. A large plant now in full bloom can' be 
seen close to the Shrub Collection on the Forest Hills Road. This is 
perhaps the most desirable yellow-flowered shrub or small tree which is 
hardy in this climate, and it is unfortunate that a plant of this character, 
which is so generally cultivated in Europe, should be so little known in 
American collections. 
The largest, one of the handsomest and hardiest of the Diervillas, 
Diervilla japonwa, a native of the elevated regions of central and north- 
ern Japan, is now in flower in the Shrub Collection. It forms a bush ten 
or twelve feet high and wide, with stout arching stems, and flowers 
which are rose color, pale yellow, dark red or nearly white on the same 
branch or on different branches of the same individual, the light-colored 
flowers often becoming rose color in fading. This is another plant which 
is too little known in American gardens. 
Rosa Amoldiana is in flower in the Shrub collection. This is a hybrid 
between Rosa rugosa and General Jacqueminot , one of the red-flowered 
Hybrid Perpetual Roses, and was raised several years ago at the Arbor- 
etum by Mr. Dawson. It bears some resemblance to an English Rose 
known as Carmine Pillar. It is a much hardier plant, however, with 
handsomer foliage, and the equally large flowers are of even a deeper 
crimson color. The flowers which are produced in clusters open in suc- 
cession and when cut last a long time in good condition. This plant is of 
special interest to the students of Roses who are trying to produce a bet- 
ter race than now exists for our northern gardens, for it furnishes anoth- 
er proof of the value of Rosa rugosa as an element in such a race. 
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, and at the Old 
Corner Bookstore, Bromfield Street, Boston. 
The Arboretum will be grateful for any publicity 
given these Bulletins. 
