Phaseolus dumosus Macfadyen (1837: 279) [clade B; sect. Phaseoli DC emend. Freytag].

TYPE: not found so far (and no indication about it in the original publication), but a description without illustration. Therefore, George Freytag designated a neotype (GF Freytag 78-Guat-47: US-3168877; ISONEOTYPES: BR, MO) using a wild form that he collected with Nader Vakili in Sololá in October 1978 .

It is perhaps the only species of hybrid origin (Mina-Vargas et al. 2016). The wild form with lilac flowers (Fig. 2) has a restricted distribution mainly along the volcanic rim of Guatemala and SE Chiapas at 1400–1900 m. This is in contrast with the white-flowered feral form distributed from Veracruz (M Rosas 722 (P)) down to Cuzco (L Valenzuela 2760 (K)) (Debouck 2019c). Phaseolus harmsianus Diels (1937) from Ecuador (type: L Diels 1028: B n.v.; syntype: E Heinrichs 191: SI-2418) and P. polyanthus Greenman (1907) from Veracruz (type: CR Barnes 20: F-194750) mentioned in the list of “Vascular Plants of the Americas” (Tropicos 2020) are synonyms as indicated elsewhere (Freytag & Debouck 2002, p. 45).

Specimens: MEXICO. Chiapas: E Ventura 2517 (MEXU-877627). GUATEMALA. San Marcos: JA Steyermark 37495 (F-1058746). Sololá: A Gentry 6516 (MO-2161807).