Researches on comparative structures were carried on Populus pseudo-simonii Kitag, Populus alba L.,Syringa oblata Lind1.,Syringa microphylla Diels and Suringa reticulata (Blume) Hara var. mandshurica (Maxim.)

• 、小叶丁香Syringa microphylla Diels和暴马丁香Suringa reticulata(Blume)Hara var.；mandshurica(Maxim