23 
Arboretum. The two old world species are geographically interesting 
but have less value as garden plants than most of the American Shad 
Bushes. 
Hawthorns. There have not before been as many species of Haw¬ 
thorns in bloom in the Arboretum as there are this week as many of 
the plants which have been raised here from seed since 1900 and planted 
on the eastern slopes of Peters Hill are flowering this year for the first 
time. Many of these trees are covered with flowers and the older and 
larger plants are all flowering while many of the Crabapples and Lilacs 
this year have flowered sparingly or not at all. Judging by the appear¬ 
ance of the Hawthorns this year it looks as if at the end of four or 
five years more the flowering of these plants would be the great flower 
event of the Arboretum year. That many of these plants can be im¬ 
proved at least in habit by good cultivation and skilful pruning appears 
this year in some of the Tenuifoliae species which grow naturally as 
small shrubs with numerous stems but have become here small, symmet¬ 
rical, single-stemmed trees. Two good examples of this change of 
habit can be seen in Crataegus Forbesse and C. pastorum, two species 
from Worcester County, Massachusetts, now in flower on Peters Hill. 
Judging by these two plants it is possible that nearly all the shrubby 
species can be grown, with the exception of some of the species of the 
Intricatae Group, in good soil into small trees. As usual Crataegus 
nigra was the first Hawthorn in the collection to open its flowers. 
This native of western Europe is a shapely tree with pale bark and 
large deeply lobed leaves. The flowers, which are arranged in compact 
clusters, have twenty stamens with anthers faintly tinged with pink, 
and are followed by handsome black lustrous fruits, which ripen in 
summer and give greater value to this tree than the flowers which are 
less beautiful than those of many of the American Hawthorns. The 
flowers of Crataegus nigra have soon been followed by those of several 
trees of the Molles Group like C. arnoldiana, C. mollis, C. submollis, 
C. Ellwangeriana, C. champlainensis, and C. Treleasii; these have been 
soon followed by C. pedicellata, C. Pringlei, C. lobulata, C. dilatata, 
C. pruinosa, and C. sertata. During the next two weeks lovers of 
Hawthorns will be able to see the flowers of more than two hundred 
species, and there will be Hawthorns flowering in the Arboretum now 
continually until July; by the middle or end of August the fruit of a 
few of the species will be ripe. 
Daphne genkwa is a shrub with slender stems sometimes three or 
four feet high, and in its native country sometimes spreading by root- 
suckers; the leaves are pointed, from one to two inches long, and cov¬ 
ered below with pale, silky hairs; the lilac-blue flowers are produced in 
April and May in stalked clusters from the joints of the naked wood of 
previous years. The long, slender wands of bloom and the unusual color 
of the flowers among early flowering shrubs make this Daphne an ex¬ 
ceptionally attractive garden plant. A native of central China it ap¬ 
pears to have been early carried to Japan where it was first found by 
Von Siebold. It was introduced into England in 1842 by Fortune, prob¬ 
ably from a Shanghai garden. Twenty years later plants were sent 
from Japan by Thomas Hogg to the Parsons Nursery at Flushing, Long 
