80 



The facts on which I base my opinion that E. rostrata is the male in th's hybrid are the following : — 



The seed-bearing E. botryoides was surrounded by E. rostrata; on the outside, there was only 

 E. globulus. The botanical characters are exactly intermediate between the two parents. The mixed 

 character of the leaves is evident. As to the capsule, it could not have a more intermediate character ; 

 in E. botryoides the valves of the capsule dry up and fall in order to set free the seeds ; in E. rostrata the 

 valves stand erect and the upper half dries up and falls. 



E. Trabuti greatly resembles E. resinifera Sm., and if I had not many times seen this hybrid 

 formed from a seed gathered from E. botryoides I should not have distinguished it. E. resinifera differs 

 in the venation of the leaves, with hypogenous stomata, and by the valves of the capsules, which are 

 entirely persistent and erect. 



E. punctata DC. also greatly resembles E. Trabuti; it differs in the absence of stomata on the 

 upper surface of the leaves. 



In collections there has been named E. resinifera from varying forms, and I think that a certain 

 number are botryoides x rostrata ; one recognises them by the very peculiar character of the valves, partly 

 deciduous at the moment of dehiscence of the capsule, a character inherited from E. botryoides. 



The descendants of this hybrid form, that I have been able to observe, are constant in their 

 characters, always in certain specimens. One can notice a certain tendency towards E. rostrata rather 

 than to E. botryoides, which in practice will lead to joining E. Trabuti to the group of the " Red Gums." 



In the plantations of the Forestry Station of Bainen I have seen in an area planted with E. rostrata 

 a large number of E. Trabuti, with a slightly exsert capsule ; it is possible that these specimens come 

 from a rostrata hybridised by a botryoides. These trees are distinguished by their great vigour. 



For what is meant in Algiers by " Red Gum," see under E. algeriensis, p. 72. 



Professor Trabut has sent me a number of specimens that he states are hybrids 

 between E. botryoides and E. rostrata. Some of them depart from the type of 

 E. Trabuti, and approach the assumed parents more or less closely. 



Eucalyptus Stuartiana x globulus Trabut 



At the Forestry Station of Bainen, in a plantation of E. Stuartiana F.v.M., there is a fairly large 

 number of specimens easy to distinguish from the type by larger fruits and sculpture, or young leaves 

 recalling absolutely those of E. globulus by the shape and by the peculiar odour. This hybrid will be 

 described later on. 



I have not seen a description, figure, nor specimens of this reputed hybrid. 



