102 
LAWN AND SHADE TREES. 
varieties with varied foliage as well as flowers, render the plan 
of grafting two or more of a kind on the same stem a very 
desirable one, especially in small grounds where only room can 
be given for a few plants. 
The Horse-Chestnut — Pavia. — The dwarf horse-chestnut — 
'pavia macro stachya — is one of the finest low-growing shrubs. 
There are two varieties, one with white and one with variegated 
or red flowers, both forming spikes large and showy in July 
and August. The plants form bushes as it were, often spreading 
Fig. 51.— Dwarf Horse-Chestnut. 
many feet wide, but seldom rising above four to six feet in 
height. 
The Hop Tree — Ptelea. — A few years since th Qptelea trifoliata 
or trefoil tree acquired a general although transient reputation 
as a plant to grow for the value of its seed capsules, as substi- 
tutes for hops, and under the name of hop tree thousands were 
sold. As an ornamental low tree when trained to a single stem 
it is very pretty and desirable for planting in the foreground 
of groups. 
The Hydrangea. — Most of the hydrangeas require protection 
