22 



THE CONIFERS OF THE NORTHERN ROCKIES. 



they grew, so that the pine leaves on the forest floor are in clusters,,as 

 they were upon the tree. Small, round scars remain upon the branch 

 from which the clusters have broken a way. 



FIG. 9. Southern Longleaf Pine. Illustrating position of staminate and ovulate flowers. Upper left, 

 a branch with staminate cones; right, a branch with cones of throe ages; at the top are two small cones 

 at time of pollination; midway two cones a year older; below, cones approaching maturity. 

 After Mohr. By permission of U. S. Department of Agriculture. 



FIG. 10. Pine cone, open. Below, to the left, lower side of seed-bearing scale showing bract; to the right, 

 the upper side showing seeds; above to right and left, seeds with wings. 

 After Mohr. By permission of U. S. Department of Agriculture. 



The buds produced at the ends of branches appear to consist of 

 narrow overlapping scales, covered with gum or resin. Beneath each 

 scale is a small green body which is the rudiment of a leaf cluster 

 for the following season. The growth in length of the branch in any 

 season is but the elongation and enlargement of the structures pre- 



