Phaseolus albiflorus Freytag & Debouck (2002: 177)

Debouck, D. G., 2021, Phaseolus Beans (Leguminosae: Phaseoleae): A Checklist And Notes On Their Taxonomy And Ecology, Journal of the Botanical Research Institute of Texas 15 (1), pp. 73-111 : 78

Phaseolus albiflorus Freytag & Debouck (2002: 177) [clade A; sect. Digitati Freytag]. TYPE: DG Debouck et al. 1510 (HOLOTYPE: US-3168862 and 3168864; ISOTYPES: COL-58795,G, K, M, MICH-1179903 ,SI, UNL n.v., UC,WIS).

It is a tall (more than 3 m) climbing plant, growing in oak and pine-oak forest at 1000–2200 m, with white flowers (fading dull ochre yellow after anthesis) ( Fig. 4 ) and floral buds like fingertips, thus belonging to the Digitati section. The stems display heteroblastic development, with leaflets usually much lobed in the upper flowering parts. The keel is much deflected towards the left wing, the last coil being almost horizontal ( Fig. 4 ). Recent collections have been done in northeastern Mexico ( Acosta-DÍaz et al. 2019).

Specimens: MEXICO. Coahuila: JA Encina 591 (ANSM-74394) . Nuevo León: DG Debouck 1507 ( US-3168358 ) . Tamaulipas: FO Zuloaga 9700 (ANSM-89228) .

Figures

FIG. 4.Close-up of flowers of:a. P.albiflorus (DG Debouck 1528), b. P.albiviolaceus (DG Debouck 2063) (photograph by J.Gereda,CIAT),and c.P.altimontanus (DG Debouck 1523).