34 Bulletin of the University of Texas 



Leaves in bundles of two or three. 



Cones oval to oblong-oval; scales without 



prickles; leaves short, %' to %' long.... 4. P. edulis. 

 Cones subterminal, 5'-15' long; scales armed 



with stout prickles 5. P. ponderosa. 



Cones lateral, conic, l 1 /^'^ 1 /^' long 6. P. echinata. 



Leaves in bundles of two; cones ovoid to globose: 



spines short or none 7. P. giabra. 



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 clusters of five, 

 about iy 2 '-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 Limpia 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. 



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, 

 scaly, 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, cylindric, 

 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 pine is stiff and hard, possessing great 

 strength. It is much used in the central and eastern part 

 of the United States as bridge ivood. 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 



