XX INTRODUCTION. 



Roxb. Fl. hid. .... Roxburgh's " Flora Indica." 

 Bot. Mag. .... Curtis's Botanical Magazine. 



Ic. PI. ..... Hooker's " Icones Plantarum." 



Wight Ic. . . . . . Wight's " Icones Plantarum." 



Journ. Roy. As. Soc. S. Br. . . Journal of the Straits Branch 



of the Royal Asiatic Society. 

 Journ. F.M.S. Mus. . . . Journal of the Federated Malay 



States Museum. 

 Journ. Linn. Soc. . . . Journal of the Linnean Society. 



I have received advice and assistance in many points from 

 Mr. J. S. Gamble and from the various members of the Kew 

 Herbarium Staff. 



H. N. Ridley. 

 May, 1922. 



