44 



KEY TO GENERA AND SPECIES 



Native in Eurasia. (Fig. 73.) 

 Scotch Pine, "Scotch Fir," Pinus 

 sylvestris L. 



83. 



Fig. 74. Red Pine. 



a. Leaf cluster. 



b. Magnified 

 cross-section of 

 a leaf. The 

 shaded portion 

 is the central 

 bundle and the 

 small circles the 

 resin ducts, c. A 

 similar section 

 of Austrian 

 Pine leaf. 



Cones about 2 inches 

 long. Young 

 branches somewhat 

 orange-colored. 

 Leaves usually shin- 

 ing, slender, and scoSh Pint 

 flexible; resin ducts Leaf cluster 



- and section 



varying in number O f a leaf. 

 and located close 

 to the surface. New England 

 to Penn. and northward. (Fig. 

 740, b.) Red Pine, Norway 

 Pine, Pinus resinosa Ait. 

 Cones 2| to 3 inches long. 

 Young branches grayish 

 brown. Leaves usually dull 

 and rigid; resin ducts vary- 

 ing in number and located 

 in the interior of the leaf, 

 midway between the sur- 

 face and the central bun- 

 dle. Leaves otherwise nearly 

 as in Red Pine. Cult. Na- 

 tive in southeastern Europe. 



