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; b, seedling one week old; c, 
detached leaves showing variation in length (two and one-half times larger than natural 
size). 
