Phaseolus micranthus Hooker & Arnott (1841: 287) [clade B; sect. Falcati Freytag].

TYPE: Lay & Collie s.n. (LECTOTYPE: K-478473) .

In the book about Captain Beechey’s voyage (1841), there is no reference to a specimen. However, there is a specimen kept in the Kew Herbarium stamped “Herbarium Hookerianum 1867” and with a handwritten note directly on the sheet “ Phaseolus micranthus Hook. Mexico Beechey,” that the author considers as the nomenclatural type. It seems to be an annual plant with distribution in tropical deciduous forest and oak forest on the Pacific slopes of Sierra Madre Occidental and Sierra Madre del Sur from 20 up to 2,000 m (Fig. 9).

Specimens: MEXICO. Sonora: AC Sanders 14340 (UCR-113614). Sinaloa: JA Beltrán M. 418 (IBUG-97924). Nayarit: RS Ferris 5957 (US-1587247). Jalisco: TS Cochrane12169 (WIS). Michoacán: LM Villareal de Puga 10263 (IBUG-99743). Oaxaca: SH Salas M.4070 (IEB-161096). Chiapas: G Flores-Franco 5097 (MEXU-1232886).