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 23. Astragalus ervoides Hook. & Arn., Bot. Beechey Voy. 417. 1840 Perennial. Stems up to 65 cm long, prostrate, decumbent o incurved-ascendent distally; minute strigose, the trichomes up to 0.4 mm long, appressed or totally glabrate in the inflorescences. Stipules 1–5 mm long, semi-clasping, not connate, lanceolate to triagular. Leaves 2–8 cm long; leaflets 11–25, 3–13 mm long, linear, ovate, oblong, elliptic to obovate, obtuse, retuse or retuse and mucronate apically, adaxially glabrous. Peduncles 3–9 cm long, curved or straight; the racemes 1.5–4 cm , flowers 5–40 soon deflexed. Flowers white, whitish, cream, pale yellow, yellowish, yellow-greenish (almost white), sometimes the keel purple to pinkish tipped; the calyx 3.4–7.3 × 2.2–9 mm , minute strigose, the trichomes black, the tube 2.1–3.8 mm long, campanulate, purple, papery; the teeth 0.7–4.2 mm long, lanceolate, triangular-deltate to acute triangular; the banner 6.2–10.2 × 3.4–6 mm , recurved, spathulate to sub-rhombic, retuse, with lilac veins; the wings 6.6–9.9 × 1.8–2.7 mm , the claw 2.6–4.2 mm long, the blade 4.4–7.3 mm long, oblong to oblanceolate, obtuse, truncate to retuse; the keel 5.5–7.7 × 1.4–3.2 mm , the claw 2.7–3.7 mm long, the blade 3.1–4.2 mm long, obovate. Pod 1.1–1.8 × 0.2–0.4 cm , commonly pendulous, sessile to short stitpitate (the stipe 0.4–2 mm long, persistent in the receptacule), triquetrous, ventrally carinate, dorsally deeply sulcate, laterally almost flattened or narrow angulate to obtuse, linear to narrow elliptic, slightly curved, basally abruptly narrow ending in a stipe, apically ending in a triangular, curved, 1–2.5 mm long beak, the valves thin, delicately reticulate, septum complete, the pod thence bilocular; ovules 10–22; seeds 1.8–2.2 mm long, yellowish to olive-green to green-brown, sublustrous. Endemic to Mexico . In mountains of northwestern Mexico , southwest Chihuahua , southern Durango and Sinaloa , western and southwestern Nayarit , western Jalisco and north-central and western Michoacán . It consists of two varieties recognized based on size of the leaves, peduncles, and the calyx teeth, and also number of ovules. A. ervoides y A. sinaloae are extremely similar in most of their features, both have stipitate pods, but, can be discerned by the ovary and fruit, both pubescent of A. sinaloae . 1. Stems 30–65 cm long; peduncles 4–9 cm long, longer than leaves; calyx teeth deltoid to wide triangular, 0.7–1.1 mm long; ovules 10–12; south Sinaloa, Nayarit, Jalisco, Michoacán, Tlaxcala ..................................................................... A . ervoides var. ervoides - Stems 10–30 cm long; peduncles 3–7 cm long, shorter than leaves; calyx teeth subulate a to lanceolate, 1.2–4.2 mm long; ovules 12–21; Chihuahua and Durango, Sinaloa ................................................................................................. A . ervoides var. maysillesii