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The article presents a study which analyzed the pollen diversity of 39 species of Lespedeza and three species of closely related genera from China, Japan and America. Lespedeza have either type II or type III germination organs and its pollen morphology is stable at the intraspecific level. Results of the pollen morphology analyses support the division of Lespedeza into two subgenera and provides insight into the systematics of some taxonomically difficult species complexes such as Lespedeza caraganae, Lespedeza juncea and Lespedeza inschanica.