40 BULLETIN 816, U. S. DEPARTMENT OF AGRICULTURE. 
The royal palms, species of Roystonea, are perhaps the most 
striking ornamental members of the whole group. They can be 
grown in southern Florida and even exist in the wild state in some 
of the hammocks below Miami. ~ 7 
PEPPER TREE. 
The California pepper tree! is much used in regions 2 and 3 and in 
the western part of region 5. It is a moderate-sized broad-headed 
tree with fine foliage, which gives it a light, airy appearance. Dur- 
ing the fall and winter it is covered with scarlet berries, which in 
contrast with the persistent foliage produce a pleasing effect. 
P1i25S6HP 
Fig. 28.—A pavement heaved by the roots of poplar trees. 
POPLAR. 
Poplars are not desirable for street planting. Their wood is 
brittle and easily broken by ordinary windstorms, and their roots 
run near the surface and are likely to interfere with pavements, as 
shown in figure 28, while those of some varieties are especially lable 
to make trouble in sewers by filling them with a mass of fibrous roots 
if access is once gained. Vigorous root growth is encouraged by the 
moisture from a leak, and the roots ultimately find their way inside. 
The southern cottonwood,’ Carolina poplar, and the northern 
cottonwood? are so similar in their adaptability for street-planting 
purposes that they will be discussed together. They are easily 
propagated, easily transplanted, are quick growing, and where they 
1Schinus molle L. 2 Populus deltoides Marsh. 3 Populus virginiana Fouger. 
