CONTENTS 



Page. 



Introduction 7 



Arrangement of the leaves on the main stalk of the cotton plant 8 



New World cottons with three-eighths spirals 9 



Old World cottons with one-third spirals 10 



Arrangement of the branches on the main stalk 10 



Arrangement of the leaves on the limbs and vegetative branches 13 



Arrangement of the fruiting branches 14 



Arrangement of the leaves and flowers on the fruiting branches 14 



Arrangement of the involucral bracts and bractlets 16 



Arrangement of the lobes of the calyx 16 



Arrangement of the intracalicary organs 18 



Arrangement of the petals 20 



Arrangement of the stamens 20 



Arrangement of the carpels 21 



Arrangement of the hairs on the surface of the seed coat 22 



Arrangement of the roots and underground shoots 23 



Conclusions ". 24 



Index 27 



•i:2.-Z 5 



