190 THE AFRICAN RUBBER VIXES 



Uganda), German and Portuguese East Africa, Nyasaland, 

 Rhodesia, the eastern portion of the Transvaal, and 

 Zululand. The wild rubber collected in the above area 

 is principally derived from this vine. The product is of 

 very good quality. 



Landolphia Daivei, Stapf . — A scandent shrub which has 

 not been observed to have tendrils. The leaves are oblong, 

 shortly acuminate, and subacute or obtuse at the base, 

 4 to 8 in. long and If to 2 J in. broad. The flowers 

 are grouped in dense subsessile corymbs which occur 

 at the end of the branches or arise from the axils of the 

 uppermost leaf pairs. The plant is closely allied to L. 

 owariensis and L. Klainei, but is easily distinguished 

 from these species by its much larger flowers. 



This vine occurs in Uganda and probably in the Belgian 

 Congo. It gives a large yield of rubber, which is of very 

 good quality. 



Laiidolphia ThoUonii, Dewevre. — A dwarf shrub from 

 6 to 12 in. high. The leaves are narrowly oblong to 

 lanceolate, obtusely subacuminate at the apex, and 

 rounded at the base ; 1 to 2 in. long and ^ to | in. broad. 

 The flowers are creamy white, and are arranged in small, 

 dense, terminal corymbs. The fruit is globose, from 

 1 to 2 in. in diameter, mottled dirty yellow when mature, 

 with thick rind. (See Plate XI.) 



This plant is one of the principal sources of the so- 

 called root rubber which is obtained from the bark of the 

 underground stems (rhizomes). It occurs in the French 

 and Belgian Congo, Angola, and Nyasaland, usually 

 growing on sandy plains. 



Landolphia parvijolia, K. Schum. — A smaU much- 

 branched shrub which develops tendrils (modified inflor- 

 escences) from the branch forks. The leaves are small, 

 oblong to lanceolate, and subacuminate to subobtuse at 

 the base ; | to 1-^ in. long and about ^ in. broad. The 

 flowers are pale yellow or white, in small, dense, subsessile 

 or shortly peduncled corymbs. The fruit resembles a 

 small orange in shape, 1 to 2 in. in diameter, greenish- 

 purple outside, with smooth thick rind. 



L. parvijolia is also one of the sources of root rubber. 

 It is found in Angola, Rhodesia, and Nyasaland. 



Clitandra orientalis, K. Schum. — A climbing shrub with 

 oblong or oblanceolate leaves, which are 3 to 3f in. long 



