HYBRIDS 175 



heavy type. No attempt has been made to have binomial designa- 

 tions for all the different crosses; only when the plant is known to be 

 still in cultivation and had no available name under Rhododendron, 

 new combinations have been formed. The hybrids between Old 

 World species have been included, as far as they have not been men- 

 tioned in the preceding paper by my colleague, E. H. Wilson, to make 

 the enumeration of the Azalea hybrids as complete as possible. 



