PREFACE, XI 



2. Plants, from the Rovuma river, collected by Drs. Kirk and 

 Meller. 



3. A set of Dr. Peter's Zambesi and Mozambique plants, 

 determined by Dr. Klotzsch, communicated by the Royal 

 Herbarium at Berlin, from whence, also, we have been favoured 

 with the loan of unique specimens belonging to the same 

 Herbarium. 



4. A few plants from Zanzibar, collected by M. Bojer, Captain 

 Speke, and Dr. Kirk, at present H.M. Vice-Consul at Zanzibar. 



In working up this Flora, I have had the great advantage, in 

 every doubtful case, of being permitted to consult Mr. Bentham 

 and Dr. J. D. Hooker, whose large acquaintance with the flora of 

 tropical Africa, especially of the western coast, already studied by 

 them in the preparation of the ' Flora Nigritiana,' has enabled 

 them to afford me very material assistance. To Dr. Hooker I am 

 further obliged for the monograph of the genus Impatiens. I had 

 hoped that a considerable portion of this Flora might have been 

 worked up by him, but numerous official engagements and the 

 publication of the ' Genera Plant arum,' in conjunction with Mr. 

 Bentham, have altogether prevented his taking a larger and direct 

 part in this work. The preparation, however, for the ' Genera 

 Plantarum,' so greatly facilitates the elaboration of such works as 

 the present, that, indirectly, both Messrs. Bentham and Hooker 

 have largely contributed to the present volume. To my friend 

 Dr. M. T. Masters, F.L.S., and to mj^ colleagues in the Herbarium, 

 Mr. J. G. Baker, F.L.S., and Mr. W. B. Hemsley, I am also much 

 indebted, for so kindly undertaking the monographs of the various 

 Orders to which their names are affixed. 



D. 0. 



