CONIFERS. 



SILVA OF NORTH AMERICA. 



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CONSPECTUS OF THE NORTH AMERICAN SPECIES. 



Leaves usually rounded and obtuse at the apex, dark yellow-green or rarely blue-green ; cones small, 



their bracts much exserted LP. muckonata. 



Leaves acuminate at the apex, bluish gray ; cones large, their bracts slightly exserted . . . . . . . 2. P. mackocakpa. 



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