RUBBER PLANTING 27 



of Hevca by the watershed of the Andes. In Panama 

 a different species, Castilloa Markhamiana, occurs, which 

 is considered less satisfactory as a source of rubber. It 

 is probable that it is this species which has been intro- 

 duced into the East. This may account for the somewhat 

 poor results which have been obtained with Castilloa in 

 British Colonies. 



Fig. 3. Castilloa ehistica. 



Castilloa has very large oval leaves, which are 

 arranged along both sides of special branches. The 

 latter fall off with the leaves, and the whole thus 

 simulates a compound leaf. The flowers are massed in 

 dense heads, and each gives rise to a single seed which 

 is white and comparatively small. The bark is very 



