40 THE PRINCIPAL RUBBER-YIELDING PLANTS 



(a) Landolphia spp. 



Landolphia Heudelotii, A. DC. West Africa from 

 Senegambia to Sierra Leone, and the southern 

 portion of the French Sudan. 



Landolphia owariensis, Beauv. West Africa from 

 Sierra Leone to Angola, the French and Belgian 

 Congo, and the Bahr-el-Ghazal Province of the 

 Anglo-Egyptian Sudan. 



Landolphia Gentilii, De Wild. Belgian Congo. 



Landolphia Droogmansiana, De Wild. Belgian 

 Congo and Nyasaland. 

 L. Gentilii and L. Droogmansiana are very 

 closely related to L. oivariensis. 



Landolphia Klainei, Pierre. Cameroons, Gaboon, 

 French and Belgian Congo. 



Landolphia Kirkii, Dyer. East Africa from Abys- 

 sinia to Zululancl. 



Landolphia dondeensis, Busse. German East Africa. 

 This vine is closely related to L. Kirkii. 



Landolphia Stolzii, Busse. German East Africa. 



Landolphia Dawei, Stapf. Uganda and probably 

 the Belgian Congo. 



Landolphia watsoniana, Vogtherr. East Africa 

 Protectorate and German East Africa. 



Landolphia ugandensis, Stapf. Uganda and East 

 Africa Protectorate. 



Landolphia kilimandjarica, Stapf. On Mt. Kili- 

 manjaro in East Africa. 



Landolphia madagascariensis, K. Schum. Mada- 

 gascar. 



Landolphia Perrieri, Jum. Madagascar. 



Landolphia sphaerocarpa, Jum. Madagascar. 



Landolphia Thollonii, Dew. French and Belgian 

 Congo, Angola, and Nyasaland. 



Landolphia parvifolia, K. Schum. Angola, Rho- 

 desia, and Nyasaland. 



Landolphia chylorrhiza, Stapf. Angola. 

 {h) Clitandra spp. 



Clitandra oricntalis, K. Schum. Uganda and Grer- 

 man East Africa. 



Clitandra Arnoldiana, De Wild, (closely related to 

 C. orientalis). Belgian Congo. 



Clitandra elastica, Che v. (also related to C. orientalis). 



