42 KEY TO GENERA AND SPECIES 



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78. Sheaths at the base of the leaf-clusters long. 



Cone scales with a small weak short prickle 

 at the tip. N. J. southwestward. (Fig. 64.) 

 Yellow Pine, Shortleaf Pine, Pinus echinata 

 Mill. 



79. Leaves i to 4 inches long 60. 

 79. Leaves 4 to 6 inches long 83. 



79. Leaves 6 to 9 inches long. Southern N. J. 

 southward along the coast. (Fig. 66.) 

 Loblolly Pine, Old-field Pine, Pinus Taeda L. 



Fig. 69. Table Fig. 70. Fig. 71. North- 

 Mountain Pine. Jersey Pine. ern Scrub Pine. 

 Leaf cluster and Leaf cluster and 

 section of a leaf. section of a leaf. 



80. Cone scales with a small weak prickle at the 

 tip. N. J. southwestward. Yellow Pine, 

 Shortleaf Pine, Pinus echinata Mill. 



80. Cone scales with a strong sharp prickle at the 

 tip 81. 



80. Cone scales usually without a prickle 82. 



