Phaseolus leptostachyus Bentham (1837: 72)

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 : 87-88

Phaseolus leptostachyus Bentham (1837: 72) [clade B; sect. Falcati Freytag].

TYPE: WF Karwinski s.n. ( LECTOTYPE: M; ISOLECTOTYPE: SI) .

The original publication about P.anisotrichos is of 1838 ( von Schlechtendal 1838), therefore this name falls into synonymy. There would thus be no reason to maintain the latter as a separate species in the list of “Vascular Plants of the Americas” ( Tropicos 2020). Note the specimen at the Darwinion is a small fragment of the original of M (from a loan?). It is a common species in openings of oak, pine-oak and tropical deciduous forests, from almost sea level to 2,500 m ( Fig. 9 ). The synonymy proposed elsewhere ( Delgado-Salinas 1985) for P. opacus Piper (1926) with P.leptostachyus makes sense. Five botanical varieties were recognized in this species ( Freytag & Debouck 2002), while in author’s view they represent the natural variation of this widespread species.

Specimens: MEXICO. Sonora: IL Wiggins 6995 (DS-264709). Tamaulipas: E Estrada-CastillÓn 2726 (CAS-794254). Chiapas: A Delgado-Salinas 823 (DS-719855). GUATEMALA. Huehuetenango: DG Debouck 3073 ( AGUAT). Jalapa: PC Standley 76999 (F-1202124). HONDURAS. Francisco Morazán: LO Williams 17292 ( MO-1737913 ). EL SALVADOR. Santa Ana: JL Linares 1070 ( LAGU). La Libertad: AC del Cid 1681 ( ITIC). NICARAGUA. Nueva Segovia: DG Debouck 3198 (O-V2147547). Granada: P Levy 1096 ( P). COSTA RICA. Guanacaste: DG Debouck 3288 (USJ-111503). Puntarenas: F Oviedo-Brenes 2776 (USJ-111843).

Figures

FIG. 9. Close-ups of flowers of: a. P.leptostachyus (DG Debouck 3165), b. P.macvaughii (J Acosta 211), and c. P. micranthus (R Buhrow M28), the three species currently recognized in the section Falcati.