A PINE. 



Pinus Austriaca, or P. laricio. 



GYMNOSPERMS; CONIFERALES; PINACE^E. 



PRELIMINARY. 



IN many parts of the country the only living pines 

 are those that have been planted for ornament. Several 

 species have been introduced in this way, and although 

 in some localities a relatively small number of individuals 

 are found, the number is sufficient to make the collection 

 of materials fairly easy. The Austrian pine has two 

 polished dark-green needle-leaves in a group. The 

 cones in which the seeds form are ten to fifteen centimeters 

 long and are relatively smooth. 



The Scotch pine, with its leaves also in pairs, may be 

 distinguished from the Austrian pine by its shorter leaves 

 (eight centimeters), its shorter cones (eight centimeters) 

 with their scales having prominent projections on the 

 free ends, which toward the base of the cone are curved; 

 and also by a grayish powdery coating upon the leaves. 



Early during the growing season, usually in the month 

 of May, two kinds of young cones may be distinguished. 

 At the tip of the young shoots very small megasporan- 

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