The flower bud differentiation process of Eulophia flava(Lindley) Hooker f.was studied by the method of paraffin cut and Olympus electro - microscope.The results showed that the flower bud differentiation process lasted for more than one month from the starting of inflorescence primordial differentiation in late April to completely maturing.The process could be divided into:Inflorescence primordium differentiation phase,Flower differentiation phase,Sepal and Petal differentiation phase,Differentiation and d...