THE GENUS PINUS


PUBLICATIONS OF THE ARNOLD ARBORETUM No. 5


THE
GENUS PINUS



BY

GEORGE RUSSELL SHAW

CAMBRIDGE
PRINTED AT THE RIVERSIDE PRESS

BY THE MURRAY PRINTING COMPANY
FORGE VILLAGE, MASSACHUSETTS

This discussion of the characters of Pinus is an attempt to determine their taxonomic significance and their utility for determining the limits of the species. A systematic arrangement follows, based on the evolution of the cone and seed from the comparatively primitive conditions that appear in Pinus cembra to the specialized cone and peculiar dissemination of Pinus radiata and its associates. This arrangement involves no radical change in existing systems. The new associations in which some of the species appear are the natural result of another point of view.

 

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