34 Bulletin of the Umversity of Texas 
Leaves in bundles of two or three. 
Cones oval to oblong-oval; scales without 
prickles; leaves short, %’ to %4’ long.... 4. P. edulis. 
Cones subterminal, 57-15’ long; scales armed 
With: Stoutspricisgios. 27 aoc eet eee 5. P. ponderosa. 
Cones lateral, conic, 1144’-2%’ long........... 6. P. echinata. 
Leaves in bundles of two; cones ovoid to globose: 
| spines ‘short’ OF NOME s.4.405 os) eee i. Beeeiabra, 
1. Pinus Flexilis James. Rocky Mountain White Pine. 
Bull Pine. Limber Pine. 
A round topped tree reaching a maximum height of 40°-50° 
and trunk diameter of 2°-5° with short trunk, stout branches, 
and thick fissured bark. Leaves borne in elusters of five, 
about-114’-3’ long, stout and stiff. Cones 3’ to 10’ long. Wood 
soft, close grained. 
Alberta southward to southeastern California and western 
Texas, extending into the Guadalupe and Linpia mountains. 
The wood belongs with the yellow pines. It is soft and 
easily worked, but the trees of our area are too small to be 
of much value for timber. 7 
2. Pinus Palustris Mill. Long Leaf Pine. Texas Long 
Leaf Pine. Texas Yellow Pine. 
A large forest tree with a maximum height of 100°-120° 
and trunk diameter of 2°-3° with narrow crown and thin, 
sealy, orange brown bark. Leaves bright green, soft, and 
flexible, sharp tipped, 8’ to 18’ long, borne in clusters of three 
with a sheath at base. The cones are almost sessile, cylindrie, 
or oblong, 6’-10’ long, frequently slightly curved. The scales 
are thin, flat and armed with a small reflexed spine. 
Southeastern Virginia to Florida and along the Gulf coast 
through Louisiana to Texas. It grows in sandy soil and is 
not common in river valleys. In Texas it extends to the 
Trinity River. 
The wood of this vine is stiff and hard, possessing great 
streneth. It is much used in the central and eastern part 
of the United States as bridge wood. It is also well adapted 
for frames, and trusses for large buildings. Large quanti- 
ties of this wood are employed for flooring and car building. 
In addition to the wood, it yields valuable naval stores, such 
as rosin, pitch, turpentine, and oils. The forests of the older 
