CONTENTS 



-5 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, strobu8 34, 36 xii 



Subsection Paracembra 36 



Group Cembroides 38 



PiNUs cembroides, Pinceana, Nelsonii 38, 40 XIII 



Group Gerardianae 40 



PiNUS BuNGEANA, Gerardlana 40, 42 XIV 



Group Balfourianae 42 



PiNus Balfouriana, aristata 42, 44 XV 



Section Diploxylon 44 



Subsection Parapinaster 44 



Group Leiophyllae ' 44 



PiNUS LBIOPHYLLA, LuMHOLTZII 44, 46 XVI 



