Phaseolus esperanzae Seaton (1893: 118) [clade A; sect. Pedicellati (Bentham) Freytag].

TYPE: HE Seaton 371 (HOLOTYPE: GH-64087; ISOTYPE: F-266758) .

A species of the Pedicellati distinguishable by torulose pods with thick sutures, spherical seeds and slightly coriaceous lobed leaflets. It seems to be distributed along the Mexican Trans-Volcanic Belt of central Mexico in oak or pine-oak woodland at 2000–2600 m.

Specimens: MEXICO. México: A Pineda R. 570 (ARIZ-178735). Distrito Federal: J Espinosa 1043 (ENCB). Hidalgo: A Ventura A. 318 (ITIC). Puebla: M Jiménez-Chimil 30220 (K).