Phaseolus pauciflorus Sessé & Mociño ex G. Don (1832:356)

Phaseolus pauciflorus Sessé & Mociño ex G. Don (1832:356) View in CoL [clade A; sect. Minkelersia (Martens & Galeotti) Maréchal, Mascherpa, & Stainier ]. T: Sessé & Mociño s.n. ( YPE LECTOTYPE: OXF).

This taxon was briefly described by MartÍn de Sessé y Lacasta and José Mariano Mociño in 1791 (date of the unpublished manuscript, according to McVaugh (1977), but eventually published in 1887) on a specimen that ended up in the Lambert Herbarium (now in Oxford, England). As explained by Sousa-Sánchez and Delgado-Salinas (1981), George Don published the description in 1832, while he wanted to give credit to these botanists. On page 117 of “Plantas de Nueva España” by Sessé and Mociño (1887) and on page 356 of “A general system of gardening and botany” by Don (1832), no specimen is mentioned, but as aptly explained by Drs. Sousa and Delgado (1981) the type is the one-raceme specimen with the handwritten note “ Phaseolus linearis ” and stamped “Fielding Oxford Herbarium.” A sprawling vine usually less than 1 m long in pine or oak grassland (at 1300–2700 m), with clover-like leaves and erect often twin pods, from a pluriannual tuberous root.

Specimens: MEXICO. Sonora: M Fishbein 2471 (NY). Chihuahua: R Corral-Díaz 3964 (NMC-65116). Sinaloa: FW Pennell 20114 (PH-773300). Durango: S Acevedo 306 (ANSM-57382). Zacatecas: J Rzedowski 1022 (MO-2209626). Nayarit: G Flores-Franco 1169 (ENCB). Jalisco: P Carrillo-Reyes4324 (IBUG-169374). México: A Delgado-Salinas 1004 (CHAPA). Distrito Federal: E Matuda 21400 (K). Morelos: LH MacDaniels 269 (F-838137). Michoacán: CP Cowan 5668 (UCR-63757). Guerrero: I Wagenbreth 282 (MO-5043672). Oaxaca: H Galeotti 3175 (G).GUATEMALA. Quiché: JI Aguilar 1472 (F-1121845).