Phaseolus anisophyllus (Piper) Freytag & Debouck (2002: 155) [clade A; sect. Minkelersia (Martens & Galeotti) Maréchal, Mascherpa, & Stainier].

TYPE: EW Nelson 4911 (HOLOTYPE: US-332953).

It seems to be a too tall and vigorous plant to be considered merely as a variant of P.parvulus (see discussion by George Freytag, 2002, p. 155), and it has been validated as a separate species of this section (Delgado-Salinas et al.2006).It has been found above 2,000 m in oak woodland in the Sierra Madre Occidental from SW Chihuahua to S Durango.

Specimens: MEXICO. Chihuahua: A McDonald 2513 (ARIZ-340049). Durango: R Spellenberg 12747 (NMC-85870).