vi PREFACE. 



Nyasaland ; E. 0. F. Allen, T. Gardner, Lord Kesteven and F. W. 

 Sykes, Rhodesia. 



Once more I must, record my acknowledgments of the aid given 

 me by Assistants in the Herbarium of the Royal Botanic Gardens ; to 

 Mr. C. H. Wright, A.L.S., in preparing the manuscript for the press 

 and in checking the proofs; and to Mr. N. E. Brown, A.L.S., for 

 working out the geographical distribution. 



For the detailed topography the third edition of the "Spezial- 

 karte von Afrika," Gotha ; Justus Perthes, 1893, has been chiefly 



used. 



W. T. T.-D. 



KEW, March 31, 1906. 



