As part of a study of variation in the three Californian populations ofPinus radiata, measurements were taken from closed cones bisected longitudinally along the plane of bilateral symmetry. These included the length and diameter of the axis, the breadth of the whole cone, and the len~th of scales and thickness (If apophyses on the inner and outer sides. The Cambria cones are the largest in all these dimensions and the Monterey cones the smallest, while cones from A#xF1;o Nuevo Point are intermediate. The average breadth/length ratio of the cones is much the same in the three population but differs greatly in individual trees. Most of the variation arises from differences in the relative diameter of the axis rather than in the relaitive length of the scales.
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