Grohya is most nearly allied to Cymhidium, from which 

 it is distinguished, firstly, by the lateral sepals being united 

 at the base ; secondly, by the large size of the petals ; thirdly, 

 by the lip having no parallel elevated lines ; and fourthly, by 

 the pollen masses being united to the gland by two distinct 

 caudiculse. 



