Astragalus psilacanthus Boissier, Diagn.Pl.Or.Nov.ser. 1 (9):97. 1949. Ali in Kew Bull.1958:313.1958; in Biologia 7:67.1961.
Perennial, root woody. Stem almost covered by persistent leaf bases; inter-nodes almost absent. Leaf paripinnately compound, petiole c. 8-13 mm long, pubescent, rachis (excluding the petiole) c. 1.5-3.0 cm long, pubescent. Leaflets 16-26, opposite to subopposite, c. 4-6 mm long, 2-3 mm broad, elliptic to oblanceolate, entire, acute, densely pubescent on both sides; petiolule 1 mm; stipules c. 5-7 mm long, pilose. Inflorescence axillary, 1-2-flowered; peduncle c. 5 mm or less, pubescent. Bracts c. 1-2 mm long, pubescent; pedicel c. 4 mm long, pubescent. Calyx c. 15-16 mm long, pilose, teeth c. 2.5 mm. long. Vexillum 2.7-3.0 cm long, panduriform. Ovary pilose. Mature fruit not seen
Type: Afghanistan, Griffith 1051, ex Herb. Hooker (K).
Distribution: Pakistan (N.W.F.Province), Afghanistan.
Deml (l.c.) has described subsp. pseudopsilocentros Deml under this species from Pakistan, citing the following specimens: “W. Pakistan, Quetta: Montes Sulaiman, inter Kingri, 30° 24’N, 69° 49'E et Makthar, 38°28’N, 69°26’E, 1500 m, 18. 5. 1965, Rechinger 29764 (W-Holotype); Rechinger 29217 (W); Lamond 1467 (E); Rechinger 29895 (W); Lamond 1419 (E,W); Rechinger 29795 (W). Unfortunately I could not get the opportunity of studying these specimens. According to Deml (l.c.) this subspecies differs from subsp. psilacanthus in having leaflets with few hairs on the lower surface and in being glabrous on the upper surface. Calyx also has fewer hairs and the flower colour is not reddish.