sentences:  While he was chair of the newly founded botany department, Greene was one of only three American representatives to the International Committee on Botanical Nomenclature and president of the Madison Botanical Congress.His controversial advocacy of nomenclature reform brought him into conflict with the president of the University, leading him to accept a position at the Catholic University of America in Washington, D.C. from 1895 to 1904.Greene then became an associate in botany at the Smithsonian Institution (1904–1915), transferring some 4,000 volumes and his valuable herbarium to the institution for a period of ten years.