8 
ers and in this climate has proved tc be one of the most satisfactory 
and reliable of all the arborescent shrubs or small trees which have 
been planted in eastern Massachusetts. A hybrid between M. Jloribunda 
and probably M. rohusta appeared here among a lot of seedlings of M. 
Jiorihunda in 1883 and has been named M. arnoldiana. It has the habit 
and abundant flowers of M. jiorihunda, but the flowers and fruit are 
nearly twice as large as those of that plant. It is a handsomer plant 
than M. fioribunda, distinguished by its long arching branches, and one 
of the most beautiful Crabapples in the Arboretum. 1 he first of the 
Asiatic Crabapples introduced into Europe, Malus spectabilii^, has been 
cultivated by the Chinese from time immemorial. Like several other 
of these plants, it is not yet known in a wild state but is probably of 
hybrid origin. It is a tree from twenty-five to thirty feet high, with 
a wide vase-shaped crown made of numerous spreading and ascending 
branches and short branchlets. The flowers are pale pink, more or less 
semidouble and fragrant. The fruits are pale yellow subglobose and 
about three-quarters of an inch in diameter. Molus spectabalis is a 
perfectly hardy, free-flowering plant and well worth a place in gardens 
where sufficient space can be allowed it for free development. What 
is probably a hybrid of Malus spectabilis, M. Scheideckeri, and some 
unknown species, possibly M. micrornalus, is a small pyramidal tree 
with small flowers produced in great abundance and well worth a place 
in a collection of these trees. 
The Crabs mentioned in this Bulletin are the most important of those 
now in flower in the Arboretum. In a later issue some account will be 
given of the later-flowering species. 
On April 23rd the first Azalea flowers in the Arboretum opened on 
the Korean Rhododendron yedoense var. poukhanense, better known as 
R. poukhanense, which last year was in bloom on the 10th of May. It is 
a very hardy shrub widely distributed in Korea from the neighborhood 
of Seoul southward, and grows generally in open Fine-woods and on 
grass-covered slopes where it forms dense mats rarely more than three 
feet high, although in more shaded positions it is occasionally as much 
as six feet tall. Here in the Arboretum in full exposure to the sun it 
forms dense mat-like bushes from two to two and a half feet tall and 
three feet or more in diameter. This Azalea is perfectly hardy in the 
Arboretum where it first flowered in 1914. The flowers are clustered, 
with a rose or rosy purple corolla, and are more fragrant than those 
of any other Azalea in the Arboretum collection. The color of the 
flowers does not harmonize with that of other Azaleas which bloom at 
the same time, and the plants are therefore best kept away from other 
Azaleas. Azalea yodogava {Rhododendron yedoense) which in recent years 
has been sent in large numbers from Japanese nurseries to the United 
States and Europe, is a double-flowered form of the Korean Azalea. 
