opposite the Lilac Group. The first of these plants to flower is a new 
addition to the collection, P. Schrenkii, var. Jackii, a rather dwarf plant 
with slender stems and medium-sized flowers discovered in Corea a few 
years ago by Mr. Jack who brought seeds to the Arboretum. The 
flowers have already nearly all fallen. The next to open are the flowers 
of the southern Appalachian P. hirsutus. P. coronarius is also one of 
the early-flowering species; this is a native of southeastern Europe and 
the Caucasus, with extremely fragrant creamy white flowers. It is the 
Mock Orange of all old-fashioned gardens and the only European species 
of this genus. There are several varieties of this plant in the collection 
but none of them are as valuable as the common form, which is still one 
of the best garden plants in the genus, and are of little interest except 
as curiosities. Many other species will soon open their flower-buds; 
among some of the most interesting are P. inodorus, with large, solitary, 
pure white flowers, and one of the most distinct and beautiful plants in 
the genus although it is little known in gardens; P. Falconerii , of un- 
known origin but probably a native of Japan or China, and P. maximus, 
a probable hybrid between two American species, and the largest of all 
the Mock Oranges. 
In no other genus of woody plants have more astonishing and unex- 
pected results been obtained by the hybridizer. A few years ago the 
Rocky Mountain Philadelphus microphyllus was sent by the Arboretum 
to Lemoine, the famous French hybridizer; this is a small-growing spe- 
cies, with small leaves, and small, very fragrant flowers. Lemoine 
crossed it with P. coronarius and produced a new race of plants to which 
the general name of Philadelphus Lemoinei has been given. These 
hybrids are dwarf and compact shrubs with pure white fragrant flowers, 
usually not as large as those of P. coronarius , and small foliage. There 
are now many named varieties of this race in the Arboretum and some of 
the most distinct and beautiful of them are Avalanche, Boule d’Argent, 
Bouquet Blanc, Candelabre, Conquete, Fantasie, Gerbe de Neige, Man- 
teau d’Hermine, Mont Blanc, Nuee Blanche, Pavilion Blanc, etc. 
These and several others are beginning to open their flowers, and no 
more charming group of dwarf hardy shrubs can be seen. Philadelphus 
microphyllus itself blooms later; none of the other species surpasses it 
in the fragrance of its flowers. With the exception of P. coronarius , all 
the species are found in the southeastern United States, the southern 
Rocky Mountain region, the northeastern United States, and in eastern 
Asia. The largest plants are found among the American species which 
generally produce larger and handsomer flowers, and are better garden 
plants than the Asiatic species which usually have smaller and less frag- 
rant flowers. 
Some of the Cornels or Dogwoods are now conspicuous. The principal 
group of these plants is at the junction of the Meadow and Bussey Hill 
Roads, and several species have been freely planted in border shrubberies 
in different parts of the Arboretum. The most interesting species now 
in flower are Cornus rugosa or circinata and C. sanguinea. The first, 
which is a common native shrub, is one of the handsomest of the genus; 
it has green branchlets, broad, rounded pale green leaves paler and hairy 
on their lower surface, and conspicuous clusters of creamy white flowers 
which are followed by beautiful light blue fruits. Like a few other Dog- 
woods, it is difficult to transplant but once established soon spreads into 
large masses. There are several individuals in the Cornel collection, and 
large shapely plants can be seen on the bank just above the group of 
Sassafras trees on the right-hand side of the Bussey Hill Road, and 
