156 SCIENCE IN AFRICA 



ally valuable. Dr. Burtt Davy is preparing check-lists of the forest 

 flora,^ in collaboration with officers of the forestry departments. 

 E. Battiscombe's useful book on the common trees and woody 

 plants of Kenya has been revised (1936).^ Our knowledge of the 

 high mountain flora of Africa was summarized by Engler in his 

 Hochgehirgsflora des tropischen Afrika (1892), and numerous works of 

 a general nature published since then have added considerably to 

 it. Humbert and Mildbraed are prominently connected with the 

 subject, and their work, though partly ecological, includes lists of 

 species from various mountains. Individual mountains have 

 claimed the attention of other authors. Lists of the flora of Mt. 

 Elgon have been given by various botanists, the most comprehen- 

 sive being that of Bullock in Lugard's Flora of Mt. Elgon in the Kew 

 Bulletin (1933). Ruwenzori is still only partially explored, and 

 the list by Rendle and Baker (1908) is still the most complete. 

 Others have been given by Chiovenda and Hauman. The Virunga 

 Mountains have attracted much attention since they include a 

 number of active volcanoes, and Mildbraed, B. D. Burtt, and Staner 

 have dealt with various aspects of the botany. The Aberdares and 

 Mt. Kenya were explored by the brothers R., E. and Th. C. E. 

 Fries, and lists of the plants they collected have been published by 

 them and others. Kilimanjaro, Africa's highest mountain, early 

 attracted botanical exploration, and Oliver's list of Sir Harry 

 Johnston's plants was the first important work on the flora of the 

 mountains. The high mountain flora includes several remarkable 

 endemic groups, and these have attracted much attention from 

 monographers. The giant Senecios have been dealt with by Fries 

 (brothers). Cotton, and Hauman, and the columnar Lobelias 

 have lately been revised by Miss E. A. Bruce (1934). The results 

 of the recent British Museum expedition to the East African 

 Mountains will be awaited with interest. 



Northern Tropical Africa 



For the north tropical region the Flora of West tropical Africa 

 (1927-36) by J. Hutchinson and J. M. Dalziel has already been 

 mentioned, and the latter author (1937) has published an appendix 

 to these volumes which deals with economic plants and their uses. 



* See Chapter vii. * Ibid. 



