Astragalus arbuscula Pall., Sp. Astragal.: 24 (1800).Fig. 19≡ Astragalus arbuscula var. mixotricha Trautv., Bull. Soc. Imp. Naturalistes Moscou 33 (1): 503 (1860).≡ Philammos arbuscula (Pall.) Steven, Bull. Soc. Imp. Naturalistes Moscou 29 (II): 146 (1856).≡ Tragacantha arbuscula (Pall.) Kuntze, Revis. Gen. Pl. 2: 943 (1891).= Astragalus arbuscula var. leucotricha Trautv., Bull. Soc. Imp. Naturalistes Moscou 33 (1): 504 (1860).= Astagalus arbuscula var. microphyllus Krylov & Serg., Fl. Zapadnoĭ Sibiri 7: 1695 (1933).= Astagalus eremothamnus Kar. & Kir., Bull. Soc. Imp. Naturalistes Moscou 15: 334 (1842).= Astagalus horizontalis Kar. & Kir., Bull. Soc. Imp. Naturalistes Moscou 14: 406 (1841).Notes.This species is distributed in China, Kazakhstan, Mongolia, and Russiain Asia (Podlech and Zarre 2013; Baasanmunkh et al. 2024 b; POWO 2025). We found this species (voucher number: MT 1-2) in semi-desert habitats of the Chu-Ily Mountain range, occurring at elevations of 500– 550 m. The morphological characters of this species are very similar to A. astrachanicus Sytin & Laktionov, but it can be distinguished by its peduncles 7–10 cm long; racemes 2–3 cm, densely 8–22 - lowered (vs. 3–3.5 cm long; racemes c. 14 cm, loosely 15–20 - flowered), pods 20–30 mm, shortly acuminate, with ± appressed white and black hairs (vs. 18–20 mm, with a beak 3–5 mm, with ascending white hairs).