Bui. 1061, U. S. Dept. of Agriculture. 
Plate 1 1 
Fig. 1. — A heavy crop of longleaf pine cones bearing 
seed occurs widely over the South at intervals of 
about every 7 years. The flowers "set" early in the 
spring; the seeds require 2 years to mature, and are 
usually shed in September. Seed crops can thus be 
foretold more than a year ahead by observing the 
small green cones on the trees in the summer and fall 
during their season of devlopment. 
Fig. 2.— Foliage and cones ("burrs") of the longleaf pine. 
