234. Trees for Shade and Ornament 
compact. A very rapid and persistent grower, and shade-enduring, 
it is well suited for mixture with deciduous trees, especially the light- 
foliaged ones. Unfortunately, two pests are troubling it the Cottony 
Scale, which is, however, not very detrimental and can be combated 
(page 151), and the Toririx (page 165), which destroys leaders, giving 
rise to unsightly double leaders or candelabra, and is less easily pre- 
vented. 
P. Lambertiana Dougl. (50), the Sugar Pine, of northern California, 
a magnificent representative of this group, with darker foliage and enor- 
mous cones (one to two feet long), is, in the East, hardy as far north as 
Massachusetts in good, deep soils, but rather a slow grower. Hardly 
superior to the white pine ornamentally, and probably subject to the 
same damage. 
P. moniscola Don. (51), the Silver Pune of the West. If collected 
from its Rocky Mountain habitats, it would be hardy, but has hardly 
any points superior to P. Sirobus, except a lighter whitish foliage, from 
which it derives its name. 
Four foreigners in this group deserve attention: 
P. Koratensis 8. & Z. (52), from Corea and Japan, is a very hardy 
tree, for small places, with darker, bluish, very dense foliage and com- 
pact habit, superior ornamentally to our white pine. An edible, fine- 
flavored seed (nut) adds to its interest. 
P. Peuce Griseb. (53), from Greece, of similar habit in color as 
the preceding, is a small tree, growing slowly and forming a narrow 
conical crown. 
P. excelsa Wall. (54), the Bhutan Pine, from the Caucasus, and 
P. Ayacahuite Ehrenb. (55), the Meatcan White Pine, both with 
longer bunches of slender needles, somewhat pendulous branches, and 
loose or open form, are adapted only for southern planting, although the 
Bhutan pine is semi-hardy in the North. 
P. Cembra Linn. (56), the Swiss Stone Pine, a large tree, also a 
white pine, lacks grace of foliage, the needles being stiff, and only in 
the form of the old trees is it superior. It is very hardy, but is of 
remarkably slow growth, and therefore to be recommended only where 
a slow grower is wanted. 
YELLOW PINES. This is the largest group of pines, much more 
varied in ornamental value than the former group, but generally of 
less value than the white pines, because of the rigidity of foliage, and the 
stiffer, more straggling habit, and long, awkward stage of development. 
