272 



The Plant World. 



that in the open pine forest are Small shrubs become fair-Sized 

 trees when thev encounter these more favorable conditions. 

 Thusiti'j not necessary to suppose that all the hammock species 



Fig. 1. The interior of a hammock, with the Royal Pa!in. Roystonia regia. 



must migrate from some distant hammock to take part in the 

 formation of a new hammock. Examples of such plants that 

 are small in the pine woods but form trees in the hammocks 



