Notes on the nomenclatural types of Notoceras bicorne (Cruciferae) and its heterotypic synonyms

The names Erysimum bicorne (basionym of Notoceras bicorne), Notoceras hispanicum, and Diceratium prostratum are discussed. A specimen preserved at BM and collected by Francis Masson in 1778 in Canary Islands (Spain) was indicated as the type of N. bicorne. This specimen at BM is the only original material found for this name. However, as cannot exclude that there were more than one specimen of this taxon, we consider this specimen in this work as the lectotype of the name, admitting that the specimen might well be the holotype of N. bicorne. A plant collected by Mariano Lagasca y Segura in 1819 in Orihuela (Alicante province, Spain) and preserved at G (G-DC) is designated as the neotype of Diceratium prostratum. Finally, the name Notoceras hispanicum published by Candolle in 1821 is an illegitimate name because it was nomenclaturally superfluous when published.