27 
easily recognized by its upright growth, and distinctly zigzag branches 
which are more thickly covered with spines than those of many of the 
related species. At the South Street entrance there are large plants 
of three other species of this group, C. mollis from the Ohio-Illinois 
region, C. arkansana from central Arkansas, and C. submollis, a New 
England and Canada tree. The flowering of all these has passed. 
Of other species v/hich have already grown to a large size in the 
Arboretum and proved desirable garden plants in the old collection 
near the parkway wall are now a number which are large enough to 
show their value. Among them are C. coccinioides, which is a round- 
headed tree from the neighborhood of St. Louis, with large flowers in 
very compact, nearly globose clusters, and large, round, red fruit rip- 
ening in the early autumn. In this collection, too, is the Cockspur 
Thorn, Crataegus Crus-galli, which has been more generally cultivated 
than any other American species, and is now the type of one of the 
most distinct groups in which the genus has been divided: C. nitida, 
a flat-topped tree with wide-spreading branches and lustrous leaves, 
comparatively small flowers and abundant fruit; the lustre of the leaves 
which turn brilliantly in the autumn and the habit of the tree make 
it one of the handsomest of the Thorns which can be cultivated in this 
climate. C. pruinosa, C. aprica and C. succulenta are also well repre- 
sented here, and are good examples of three large and distinct groups. 
C. pruinosa is a small tree with smooth bluish green leaves, large 
flowers made conspicuous by the large, rose-colored anthers of the 
twenty stamens and globose fruit, bright green and covered with a 
glaucous bloom when fully grown and turning scarlet late in the 
autumn. In all eastern North America there are few Thorns hand- 
somer than this. C. aprica is interesting as one of the few hardy 
representatives of the Flavae Group which is entirely confined to 
the southeastern states with a few representatives ascending into the 
valleys of the southern Appalachian Mountains. It is not one of the 
handsomest species of the group for the flowers are not so large as 
those of many others, and the anthers of the ten stamens are yellow. 
C, succulenta is a showy representative of the Tomentosae Group which 
is one of the handsomest of the northern groups and is especially beau- 
tiful in autumn when the branches are covered with large clusters of 
drooping scarlet fruit. Two black-fruited species here are the C. Doug- 
lasii from Washington and Oregon, and C. rivularis from the Rocky 
Mountains and the Sierra Nevada. Many of the species in the collec- 
tion on Peter’s Hill are already large enough to show their character 
and value, especially those of the Intricatae Group. 
Early Rose«. Three interesting Roses are already in bloom. The 
first, Rosa Ecae, less beautiful when in flower than Rosa Hugonis, is 
a native of Afghanistan, where it is common on dry mountain ridges, 
and of Samarkand, is well worth a place in a collection of Roses for 
the species with yellow flowers which are hardy in this climate are few 
in number. Rosa Ecae is a spiny shrub with small leaves which are 
delightfully fragrant throughout the season, and pale yellow flowers 
not more than an inch and a quarter in diameter. 
