THE TRUE PINES. 291 



A tree attaining a height of 50 feet, and inhabiting the 

 ravines in the mountains near Apulco in Mexico, where it was 

 first discovered by Mr. Hartweg in 1839. Roezl found it on 

 the Sierra of Zacatlan, at an elevation of 7000 feet, forming a 

 beautiful tree 60 feet high. 



It is rather tender. 



No. 59. Pinus aristata, Engelmann, the Awned-cone Pine. 



Leaves in fives, thickly set all round the branches, three- 

 sided, abruptly-pointed, entire on the edges, bright green on 

 botli sides, mostly with numerous exudations of a white resin 

 on their surface, and rising from the axils of ovate, acuminate, 

 brittle, light-brown scales, which are more persistent than the 

 leaves themselves, and cover the branches with their rough, 

 blackish remains ; on young and very robust trees the leaves 

 are more or less curved upwards, and from one inch and a 

 quarter to one and three-quarters long and half a line wide; but 

 on old and stunted trees they are scarcely an inch long, quite 

 straight, very spreading, and so thickly placed all round the 

 branchlets as to give them the appearance of so many bottle 

 brushes. The sheaths on the young leaves are from three to 

 four lines long, and consist of seven or eight oblong-pointed, 

 adpressed scales, with fringed margins, which soon become 

 spreading, squarrose, and fall off in the second year; many 

 lanceolate scales also sheathe the lower part of the young shoots, 

 and Ena'elmann states that he has seen branches with sixteen 

 spaces, where male flowers grew, which proved that the leaves 

 were persistent for that number of years. Branches spreading, 

 often contorted, and covered with a smooth thin bark, full of 

 large vesicles, containing a clear fluid balsam, which remains 

 between the layers of the old bark. The stems and larger 

 branches of old trees are frequently covered with young shoots, 

 like those of Pinus Tseda, the female aments, or young cones, 

 bristling with their slender, lanceolate, aristate, erect scales, 

 are produced singly or two together near the ends of the young 

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