Phaseolus oaxacanus Rose (1903: 48) [tentatively in clade A; sect. Pedicellati (Benth.) Freytag].

TYPE: CG Pringle 5814a (LECTOTYPE: US-372011; ISOLECTOTYPES: ENCB, MEXU, MO-1731120).

This endemic species distributed in pine forests in the mountains surrounding the valley of Cd. Oaxaca at 2200–2700 m has been recently questioned as member of the section Pedicellati (Delgado-Salinas et al. 2006) . In a previous study (Delgado-Salinas et al. 1999) it was considered as related to this section, and also distinct enough to be seen as a valid species as compared to P.pedicellatus (a move from his varietal treatment of 1985). New data are needed to reassess the position of this taxon in the genus.

Specimens: MEXICO. Oaxaca: R Acevedo-Rodríguez 130 (ENCB), CG Pringle 5661 (GH), M Sousa-Sánchez 7816 (MEXU-209055).