EVERGREEN TREES. 167 
have cones of both of these species, but can see no differ- 
ence between them. 
Prsus riewa (Pitch Pine).—Leaves three to six inches 
long, in threes, rather flat, somewhat twisted, as shown in 
fig. 46; cones oval, sometimes slightly conical, two to 
three inches long, scales tipped with a short, stout, re- 
curved spine. Fig. 47 shows a cluster of the cones, natural 
size, at the end of the first summer. These were fertilized 
by the staminate flowers in spring, and remained almost 
stationary, enlarging but little during the entire season. 
Fig. 48, 
The next spring they enlarge very rapidly, and are of full 
size by the first of July. Fig. 48 shows one of the cones, 
natural size. These cones adhere to the tree very tena- 
