BOTANY 155 



Southern Tropics 



For the south tropical region the catalogue of Welwitsch's African 

 plants, prepared by the British Museum Department of Botany 

 ( 1 896-1 901), is a monumental work; it is published in five parts 

 running to 1,350 pages and is based on the finest collection of 

 plants ever made in tropical Africa. Another work on this region 

 is the enumeration of John Gossweiler's Angolan plants, published 

 continuously since 1926 as a supplement to the Journal of Botany, 

 and already running to about 450 pages (Exell, Good and others 

 1926 onwards). A critical revision of all the Angola material from 

 the great herbaria is being prepared by members of the staff of the 

 Department of Botany in collaboration with Mendonga to be pub- 

 lished in a work entitled Conspectus Florae Angolensis. The first volume 

 of this, by L. G. Exell and Mendonga, which covered the families 

 from Ranunculaceae to Malvaceae, appeared in 1937. Many 

 other studies on the Angolan flora have been published in Portugal, 

 mainly from Coimbra University. 



The Rhodesias are not well equipped with systematic reference 

 works, but the list of Southern Rhodesian plants by F. Eyles (191 6), 

 though now out of date, has proved valuable. Two Swedish expe- 

 ditions have contributed to our knowledge of the Rhodesias. The 

 first, under Graf von Rosen (191 1-12), visited Northern Rhodesia, 

 and the second and smaller expedition of 1930, led by Th. Fries, 

 explored the Inyanga Highlands of Southern Rhodesia. The 

 botanical results of von Rosen's expedition have been published 

 by R. E. Fries, and those of the second expedition are being dealt 

 with in a series of monographic studies by various Swedish bota- 

 nists. E. Milne-Redhead has made two extensive tours in Northern 

 Rhodesia, the first in connection with the aerial survey of that 

 territory. His collection has been named and the MS. list is avail- 

 able for consultation. For Nyasaland Burtt Davy and Hoyle (1937) 

 have compiled a check-list of all the forest trees and shrubs.^ 



Central Tropics 



For the central tropical region. Professor Engler and the staff of 

 the Botanical Museum at Berlin have published much material on 

 East Africa, Dr. Engler's own work (1891 and 1895) being especi- 



* See Chapter vii, p, 198. 



