204 FOREST TREES. 
P, Lambertiana, P. monticola, P. flexilis, and P. 
aristata are, according to Hoopes, hardy in the neigh- 
borhood of Philadelphia, and merit the attention of 
amateurs, but are as yet too scarce and too imperfectly 
tested to be recommended for general culture. 
SECTION TERNATIZA. 
THREE LEAVES IN A SHEATH. 
4. Pinus rigida—Pitch Pine. 
Leaves, three to five inches long, rigid, flattened, 
dark green; sheaths, very short; cones, one to three 
and a-half inches long, ovoid-conical or ovate, some- 
times clustered, persistent; the scales tipped with a 
short, recurved, stout prickle. 
This species of Pine appears to be confined to the 
States bordering on the Atlantic. I have never 
heard that it is found west of the Alleghanies. It 
grows in a variety of soils. In some parts of New 
England and New York it occupies poor sandy lands, 
whose barrenness is attested by the meagre, stunted 
appearance of the trees, which seldom exceed thirty 
feet in height. Further south itis found on the 
ridges of the Alleghanies, in better soil and of larger 
growth. In swamps it attains its greatest size, which 
is seventy or eighty feet in height, and eighteen to 
thirty inches in diameter. The sap wood usually 
comprises three-fourths of the diameter of the tree. 
The branches are numerous, the wood extremely 
knotty, and when grown on dry land it is highly 
resinous and heavy. Where it is abundant and of 
