Phaseolus grayanus Wooton & Standley (1913: 139) [clade A; sect. Pedicellati (Bentham) Freytag]. TYPE: EA Mearns 2124 (HOLOTYPE: US-232982; no isotype indicated in the original publication nor seen during this study). A widely distributed member of the Pedicellati in the oak-pine forest of the Chihuahuan Desert at 1400–2800 m. Once considered as variety of P.pedicellatus, it deserves the specific rank because of stronger trailing and then climbing stems, slightly coriaceous leaflets with squarish lobes, strong peduncles with 6–14 primary bracts. Phaseolus pyramidalis Freytag and P.teulensis Freytag mentioned in the list of “Vascular Plants of the Americas” (Tropicos 2020) seem to be synonyms of P.grayanus. Specimens:U.S.A. Arizona: JC Blumer 1347 (MIN-141973). New Mexico: R Spellenberg 12579 (NMC-69787). Texas: AC Sanders 3152 (UCR-37304). MEXICO. Sonora: SS White 3419 (GH). Chihuahua: E Estrada-CastillÓn 2806 (BRIT). Coahuila: DH Riskind 2245 (TEX-273493). Nuevo León: JA Villareal-Quintanilla 9083 (ANSM-73611). Durango: HS Gentry 8376 (ARIZ-300362). Zacatecas: DG Debouck 331 (K). San Luís Potosí: CL Lundell 5521 (WIS). Jalisco: R Ramírez-Delgadillo 1708 (IBUG-107601).

Published as part of Debouck, D. G., 2021, Phaseolus Beans (Leguminosae: Phaseoleae): A Checklist And Notes On Their Taxonomy And Ecology, pp. 73-111 in Journal of the Botanical Research Institute of Texas 15 (1) on page 86, DOI: 10.17348/jbrit.v15.i1.1052, http://zenodo.org/record/16906371