Phaseolus amabilis Standley (1940a: 28) [clade A; sect. Minkelersia (Martens & Galeotti) Maréchal, Mascherpa, & Stainier].

TYPE: HS Gentry 2471 (HOLOTYPE: F n.v.; ISOTYPES: DES, GH-64083, K-478471, MO-1163243, UC-581881).

It has larger flowers as compared to other species of the section ( P.pauciflorus being another case in this section but with a different floral morphology). It seems to be rare, but possibly not a hybrid as suggested elsewhere (Fishbein et al. 1998) because of the following collection found at different time and place.

Specimen: MEXICO. Chihuahua: T Lebgue 2481 (NMC-70649).