INTRODUCTION. 



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

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

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



The volume contains studies on 212 species and 6 varieties ranging from 

 the Berberidese down to the Polypodiacese. All the species of phanero- 

 gamous 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 ENGJ&ER and PRANTL. Of the species and 

 varieties mentioned in this work, 126 are proposed as new species and 6 are 

 regarded as new varieties of known species, while 86 are identified with 

 species which were already known as from Formosa or from other countries. 

 One genus, Parasitipomaea, is proposed as a new, while 9 genera are men- 

 tioned as new to the flora of the island. The latter genera are as follows : 

 Nuphar Gardneria Myrmechis 



Picrasma Acanthephippium Gymnadenla 



Gerbera Vrydagzynia Woodsia 



Species,* genera* and families* now to be added to the flora of Formosa 

 number as many as 121 species and 10 genera. Thus, up to the present 

 date, the total number of species of the flora, so far as known, is 3446 species 

 belonging to 954 genera and 160 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. 

 December 1916, Taihoku and Tokyo. 



* It should be understood that plants outside of the island are not counted in this number, 

 although they are mentioned in this volume. 



