The genus Astragalus (Leguminosae: Papilionoideae: Galegeae) in Mexico Author Castillón, Eduardo Estrada 0000-0003-1061-9862 Universidad Autónoma de Nuevo León, Facultad de Ciencias Forestales, A. P. 41, 67700, Linares, Nuevo León, Mexico aeduardoestradac @ prodigy. net. mx; https: // orcid. org / 0000 - 0003 - 1061 - 9862 aeduardoestradac@prodigy.net.mx Author Quintanilla, José Ángel Villarreal 0000-0001-9672-8693 Universidad Autónoma Agraria Antonio Narro, Departamento de Botánica, Saltillo, Coahuila, Mexico javillarreal 00 @ yahoo. com; https: // orcid. org / 0000 - 0001 - 9672 - 8693 javillarreal00@yahoo.com Author Delgado-Salinas, Alfonso 0000-0002-9322-9968 Universidad Nacional Autónoma de México, Instituto de Biología, 21068 adelgado @ ib. unam. mx; https: // orcid. org / 0000 - 0002 - 9322 - 9968 adelgado@ib.unam.mx Author Rebman, Jon P. 0000-0003-1061-9862 Universidad Autónoma de Nuevo León, Facultad de Ciencias Forestales, A. P. 41, 67700, Linares, Nuevo León, Mexico aeduardoestradac @ prodigy. net. mx; https: // orcid. org / 0000 - 0003 - 1061 - 9862 & San Diego Natural History Museum, P. O. Box 121390, San Diego, California, 92112 jrebman @ sdnhm. org; https: // orcid. org / 0000 - 0002 - 4150 - 7356 & Universidad Autónoma de Nuevo León, Facultad de Ciencias Forestales, A. P. 41, 67700, Linares, Nuevo León, Mexico aeduardoestradac @ prodigy. net. mx; https: // orcid. org / 0000 - 0003 - 1061 - 9862 aeduardoestradac@prodigy.net.mx text Phytotaxa 2023 2023-03-07 586 1 1921 1935 http://dx.doi.org/10.11646/phytotaxa.586.1.1 journal article 10.11646/phytotaxa.586.1.1 1179-3163 7703999 100. Astragalus waterfallii Barneby, Leafl. W. Bot. 7: 31. 1953 Type : — USA , New Mexico , Eddy County , 21 miles west of Artesia , 12 April 1953 , U. T. Waterfall 10615 ( holotype : OKLA 100018 digital image!; isotype: CAS 0027730 digital image!, RSA 0003147 digital image!, MO-149300 digital image!, US 00001637 digital image!, GH 00059397 digital image!) . Perennial. Stems short, up to 9 cm long, mainly acaulescent, pubescence dense, white, short stigose, the trichomes up to 0.7 mm long, straight, appresed. Stipules free to clasping, somewhat decurrent by a half or three quarters of stem´s circumference. Leaves 2–12 cm long, leaflets 9–25, 3–16 mm long, ovate, elliptic, ovate-oblong to oblanceolate, bicolored, brighter green and glabrous adaxially, abaxially dense pubescent. Peduncles 1.5–11 cm long, ascendant, soon deflexed and humistrate with age; the racemes 1.5–4 cm long, floweres 4–18. Flowers purple with white tones basally, the calyx 10–14 × 3.7–5 mm , tiny strigose, with white and black trichomes or both types mixed, the tube 8– 11.5 mm long, cylindric, with purple tones, the teeth 1.3–4 mm long, subulate to triangular-subulate; the banner18–23 × 6–11 mm , ovate to oblanceolate, strongly curved; the wings 17–22.5 × 2.1–3.5 mm , the claw 8–11.4 mm long, the blade 10–12.8 mm long, lanceolar obovate; the keel 14.5–19 × 2.8–3.6 mm , the claw 7.5–10.9 mm , the blade 7.4–9.6 mm long, lanceolate-obovate, incurved. Pod 1.8–3.8 × 0.5–0.8 cm , sessile, humistrate but ascending, triquetrous or trigonous but little compressed laterally, incurved, oblong to oblong-elliptic or clavate-ellipsoid, gradually acute to the base, abruptly acute at apex, ending in a cuspidate small beak, ventrally carinate, lateral faces rounded, dorsally slightly sulcate, the valves leathery, fleshy to stiff-papery, brown to black-brown, finely reticulated and wrinkled, septum complete, the pod thence bilocular; ovules 28–38; seeds 2.2–3.2 mm long, mitten shaped, brown to lightbrown, occassionally with purple spots, shiny. Distribution:— Rare in Mexico, recorded and reported ( Barneby, 1964 ) for northern Chihuahua (Sierra Rica, 1881, Havard 31 (GH)), and Coahuila (Sierra de Parras, X-1910 , Purpus 4671 (UC)). Also, in New Mexico and Texas ( USA ) ( Fig. 27 ). Comments: Species easily identified by its short stems or even acaulescent ones. Specimens examined : — CHIHUAHUA : (cited by Barneby, 1964 , page 653, Map 83). Material not seen for Mexico . TEXAS (very near to the Mexican border) : 26 April 1961 , Culberson , Just NE of San Antonio Peak , Sierra Tinaja Pinta , on upland plateau, D. S. Correll & R. C. Rollins 23877 ( TEX-LL ) ; 27 March 1932 , E. Whitehouse 128d ( TEX-LL ) ; 16 May 1959 , Culberson , Head of pass in vicinity of roadside park, Guadalupe Canyon, D. S . Correll & I. M. Johnston 21996 ( TEX-LL ) ; 28 Febraury 1957, Presidio , 25 mi. SW Marfa toward Shafter, B. H . Warnock 14343 ( TEX-LL ).