INTRODUCTION. 



As was announced in the introduction of the third volume of this work, 

 the present volume is principally devoted to the fifth part of those studies 

 which have for the most part been upon new material, collected since 1912. 



The volume contains studies on species and varieties ranging from 

 the Berberideas down to the Selaginellaceas. All the species of 

 Phanerogamous plants are here arranged, as in the preceding volumes, after 

 the system of BENTHAM and HOOKER ; while those of vascular cryptogams are 

 arranged after the system of ENGLER and " PRANTL. Of the species and 

 varieties mentioned in this work, 47 are proposed as new species and 3 are 

 regarded as new varieties of known species. One genus, Polliniopsis, is 

 proposed as a new, while 4 genera are mentioned as new to the flora of 

 the island. The latter genera are as follows: 



Sphcerocaryum Axonopus 



Euchloena Muehlenbergia 



Thus, up to the present date, the total number of species of the flora, so 

 far as is known, is 3359 species and 57 varieties belonging to 1173 genera 

 and 169 families.* 



Finally, I avail myself of this opportunity to tender my hearty thanks 

 to the officials of the Government of Formosa, to whom I am much indebted 

 for help in the collection of material and in the publication of this work. 



B. HAYATA. 

 October 1917, Taihoku and Tokyo. 



* Readers will notice that there are some differences between the numbers given in this 

 volume and those in the preceding one. ^This is mainly explained by the fact that, since the 

 publication of the General Index to the Flora of Formosa, a considerable number of doubtful 

 species have been excluded from the flora of the island. 



