begin to unfold as the flowers open. The fruit of these plants is globose 
or pear-shaped, crimson, scarlet or rarely yellow, and of excellent fla- 
vor. The plants of this group are comparatively rare in the east; they 
do not extend into the southeastern states, and are most abundant in 
the region from Illinois and Iowa, through Missouri and Arkansas, to 
eastern Texas. Of this group there are now in flower at the South 
Street entrance large plants of C. mollis, C. submollis, and C. arkan- 
6<ina. The last is a particularly valuable plant as it retains its brilliant 
fruit until late in the season and longer than the other plants of this 
group. Another interesting plant of this group, C. Arnoldiana, is 
valuable because the fruit ripens in August when showy fruits are rare 
here. This tree was first discovered growing wild in the Arboretum 
and is still known only from a few stations. It is one of the few species 
of Crataegus which can be easily recognized in winter when its strongly 
zigzag branches are conspicuous. There are large plants of this tree 
on the left of the Centre Street entrance, and there are a number of 
them on the Valley Road in front of the Oak Collection. All of the 
species of the Mollis Group are American with one exception, Crataegus 
peregrina, which is probably a native of Persia. From the American 
species it differs in the color of the fruit which is dark purple, unlike that 
of any American Hawthorn. This plant is in flower in the old Cratae- 
gus Collection on the bank between the Shrub Collection and the Arbor- 
way boundary of the Arboretum, in which there are also plants in 
flower of C. arkansana and C. Arnoldiana . 
Many plants in the Plum Collection now deserve inspection, notably 
Prunus hortulana and P. Munsoniana , both natives of the Missouri- 
Arkansas-Texas region, the latter the Wild Goose Plum of pomol- 
ogists. Many of the early flowering Crabapples are still in good condi- 
tion and the flowers of many others are still to open. 
In the general Rhododendron Collection at the base of Hemlock Hill 
R. carolinianum is in flower. This is a native of the slopes of the 
southern Appalachian Mountains. Although this plant was sent to 
England more than a century ago, it has been entirely lost sight of 
until a few years ago, having been confused with R. minus or puncta- 
tum, a southern plant of lower altitudes, different habit and foliage 
and less attractive flowers. R. carolinianum flourishes in the shade 
and in full exposure to the sun. It is a dwarf plant of compact habit; 
the leaves are dark green, and the comparatively small pink flowers are 
borne in compact clusters. It is perhaps as hardy in New England as 
any Rhododendron, and it is certainly a plant of great promise either 
for the decoration of parks and gardens or a possible element in a new 
race of hybrids. Several plants of Rhododendron coreanum are in 
flower on Azalea Path. This species, which was discovered by Mr. 
Jack in Korea, is also a plant of much promise; it is one of the species 
with deciduous or nearly deciduous leaves; the habit is good, and the 
abundant flowers are of a pleasant rose-purple color. Judging by the 
experience with it in the Arboretum during the last two or three years 
it is one of the best of the recent introductions of its class. 
When this bulletin reaches its readers many of the plants in the Lilac 
Group will be in flower, and persons interested in Lilacs should visit 
the Arboretum during the next week. 
The Arboretum will be grateful for any publicity 
given these Bulletins. 
