DIVISION II.  RULES AND RECOMMENDATIONS
CHAPTER V. REJECTION OF NAMES

Ex. 1. The name Strophostyles helvola (L.) Elliott was widely and persistently used from the mid-19th century for a taxon that Verdcourt (in Taxon 46: 357-359. 1997) reported did not include its type, which he found to be referable to Macroptilium lathyroides (L.) Urb., based on Phaseolus lathyroides L. (1763) and over which P. helvolus, the basionym of S. helvola, has priority. Verdcourt did not transfer the epithet helvolus to Macroptilium which would have conflicted with current usage, but proposed P. helvolus for conservation with a conserved type that he believed referred to the species to which the name S. helvola had been applied; the proposal was accepted. When Delgado-Salinas & Lavin (in Taxon 53: 839-841. 2004) later discovered that this first-conserved type applies to another species, Strophostyles umbellata (Muhl. ex Willd.) Britton, they also preserved current usage and proposed a new conserved type.