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THE GENUS PINUS
PUBLICATIONS OF THE ARNOLD ARBORETUM No. 5
THE
GENUS PINUS
BY
GEORGE RUSSELL SHAW
[Illustration: Printer's Logo.]
Es giebt jedoch auch Arten--und dieses ist
fuer den Systematiker wie fuer den Physiologen
gleich wichtig--welche sich den wechselnden
Bedingungen der Feuchtigkeit so vollkommen
anpassen, dass ihre extremen Formen zu
ungleichen Arten zu gehoeren scheinen.
_Schimper._
CAMBRIDGE
PRINTED AT THE RIVERSIDE PRESS
1914
REPRINTED 1958 BY THE MURRAY PRINTING COMPANY
FORGE VILLAGE, MASSACHUSETTS
CONTENTS
Page Plate
PART 1 CHARACTERS OF THE GENUS 1
Cotyledon, Primary Leaf, Bud and Branchlet 1, 2 I
Secondary Leaves 2 II
External Characters 4
Internal Characters 4
Flowers and Conelet 7 III
Cone 8 IV
Phyllotaxis 12 V
Cone-tissues and Seeds 12-16 VI
Wood 17 VII
Bark 18