The typification of Zamia erosa and the priority of that name over Z. amblyphyllidia

The lectotype designation of Zamia erosa O.F. Cook & G.N. Collins by Eckenwalder (1980) is corrected to a neotype as it does not constitute original material on which Cook & Collins based their description. The neotype designation is itself superseded, as the specimen selected by Eckenwalder is in serious conflict with the protologue, a conclusion based on over-looked descriptive and geographic information in the protologue, and new collections recently made near the type locality. A new neotype is designated. We have further determined that Z. erosa is an earlier validly published name for the species currently known as Zamia amblyphyllidia D.W. Stev.