Phaseolus plagiocylix Harms (1921: 508) [clade A; sect. Minkelersia (Martens & Galeotti) Maréchal, Mascherpa, & Stainier].

TYPE: E Seler 1042 (HOLOTYPE: B n.v.; ISOTYPE: GH-64098).

The type was probably lost at Berlin during WWII, and in the original publication (p. 508) there is no mention about isotypes. There is however a specimen labelled “Ex Museo botanico Berolinensi” kept in the Gray Herbarium (GH-64098) and annotated by Hermann Harms “1042 Phaseolus plagiocylix Harms n.sp. ” that can be considered as the nomenclatural type. Known by few collections from Nuevo León, it has been reported from southern Coahuila (Carranza-P. & Villareal-Quintanilla 1997), but no specimens are indicated (nor seen by the author during his visit at ANSM in 2011). Some authors (Acosta-DÍaz et al. 2019) consider it as extinct.