Izabalaea excelsa (Nyctaginaceae) is transferred to Agonandra (Opiliaceae). Because the name A. excelsa already exists and applies to a different species, a substitute name is proposed: A. goldbergiana. A. conzattii is treated as subspecies of A. obtusifolia, A. obtusifolia subsp. conzattii.
References
P. C. Standley
1920: The North American species of Agonandra.
— J. Washington Acad. Sci. 10: 505–508. Google Scholar