Phaseolus marechalii A. Delgado (2000:427) [clade B; sect. Paniculati Freytag].

TYPE: A Delgado-Salinas 115 (HOLOTYPE: MEXU n.v.; ISOTYPES: GH-423042, K-651819).

Some differences with P. rotundatus and other related species have been presented elsewhere (Salcedo-Castaño et al. 2009) (note the striped standard in Fig. 8). Its range is mainly along the Mexican Trans-Volcanic Belt, at 2400–2500 m, in oak, pine-oak and pine forest.

Specimens: MEXICO. México: DG Debouck 2377 (MICH-1179985). Morelos: OW Norvell HM215 (UC-933928). Puebla: DG Debouck 2389 (IBUG-182551).