Bui. 327, U. S. Dept. of Agriculture. 



Plate IV. 



PlCEA ENGELMANNI: FOLIAGE AND OPEN CONES. 



a, Upper (left) and lower (right) sides of seeds with wings; 6, seedling one week old; c, 

 detached leaves showing variation in length (two and one-half times larger than natural 



size). 



