The Genus Pinus   By: George Russell Shaw (1848-1937)

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 für den Systematiker wie für den Physiologen gleich wichtig welche sich den wechselnden Bedingungen der Feuchtigkeit so vollkommen anpassen, dass ihre extremen Formen zu ungleichen Arten zu gehören 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

PART 2 CLASSIFICATION OF THE SPECIES 22

Sections, subsections and groups 25

Section Haploxylon 26

Subsection Cembra 26

Group Cembrae 26

Pinus Koraiensis, Cembra, Albicaulis 26, 27 VIII

Group Flexiles 28

Pinus Flexilis, Armandi 28, 30 IX

Group Strobi 30

Pinus Ayacahuite, Lambertiana 30, 32 X

Parviflora, Peuce, Excelsa 32, 34 XI

Monticola, Strobus 34, 36 XII

Subsection Paracembra 36

Group Cembroides 38

Pinus Cembroides, Pinceana, Nelsonii 38, 40 XIII

Group Gerardianae 40

Pinus Bungeana, Gerardiana 40, 42 XIV

Group Balfourianae 42

Pinus Balfouriana, Aristata 42, 44 XV

Section Diploxylon 44

Subsection Parapinaster 44

Group Leiophyllae 44

Pinus Leiophylla, Lumholtzii 44, 46 XVI

Group Longifoliae 46

Pinus Longifolia, Canariensis 46, 48 XVII

Group Pineae 48

Pinus Pinea 48 XVIII

Subsection Pinaster 50

Group Laricionea 51

Pinus Resinosa, Tropicalis 51, 52 XIX

Massoniana, Densiflora 52 XX

Sylvestris, Montana 54 XXI

Luchuensis, Thunbergii, Nigra 56, 58 XXII

Merkusii, Sinensis, Insularis 58, 60 XXIII

Group Australes 62

Pinus Pseudostrobus 62 XXIV

Montezumae 64 XXV

Ponderosa 66 XXVI

Teocote, Lawsonii 68 XXVII

Occidentalis, Palustris 70 XXVIII

Caribaea 70 XXIX

Taeda, Glabra, Echinata 72, 74 XXX

Group Insignes 76

Pinus Pringlei, Oocarpa 76, 78 XXXI

Halepensis, Pinaster 78, 80 XXXII

Virginiana, Clausa 80 XXXIII

Rigida, Serotina, Pungens 82, 84 XXXIV

Banksiana, Contorta 84 XXXV

Greggii, Patula 86 XXXVI

Muricata, Attenuata, Radiata 86, 88 XXXVII

Group Macrocarpae 90

Pinus Torreyana, Sabiniana 90 XXXVIII

Coulteri 93 XXXIX

INDEX 94

INTRODUCTION