Podlech & Zarre (2013), vol. II, p. 846Plants 20−45 cm tall, sparsely hairy with hairs 0.1−0.2 mm. Stems 13−34 cm, angular-sulcate, glabrous or with scattered hairs only. Stipules greenish, 3−7 mm, triangular to ovate, the upper ones narrowly triangular, all free from petiole and from each other, glabrous. Leaves 5−8 cm, the lower ones with a petiole up to 1.5 cm, the upper ones subsessile; rachis sparsely furnished with subapressed, mainly black hairs. Leaflets in 5−7 pairs, narrowly ovate to ovate, 8−25 × 5−10 mm, rounded, on upper side glabrous, on underside sparsely covered with appressed white hairs, sometimes subglabrous. Peduncles several, 5−20 cm, erect, slightly angular-sulcate, very sparsely black hairy to subglabrous. Racemes ovoid or oblong, 2.5−5 cm long, rather densely 10−20-flowered. Bracts whitish-membranous, narrowly triangular, 1.5−2.5(−3) mm, sparsely hairy, at the base with some sessile, minute glands. Pedicels 1−2 mm, erect, strongly recurved in upper part, flowers therefore spreading or the lower ones nodding, black hairy. Calyx 5−6 mm, campanulate, obliquely cut at the mouth, rather densely covered with appressed black hairs 0.1−0.2 mm, sometimes with white hairs mixed in; teeth narrowly triangular, 0.5−1 mm, densely hairy on inner side. Petals pale lilac. Standard 11−12 × 7 mm, obovate, emarginate, at the base gradually cuneately narrowed. Wings c. 10 mm; blades narrowly oblong, rounded, 6 × 1.5 mm; auricle 1.5 mm, claw 4 mm. Keel 8 mm; blade obliquely elliptic,with widely curved lower edge and slightly curved upper edge, subobtuse, 3.5 × 2 mm; auricle indistinct, claw c. 4 mm. Stamen-tube truncate at the mouth. Ovary with a stipe c. 1 mm, hairy; style glabrous. Legumes subsessile or with a stipe 1−1.5 mm, nodding, ovoid to ellipsoid, 6−8 mm long, c. 3 mm high and 4 mm wide, obtusely keeled ventrally, shallowly grooved dorsally, abruptly shortly acuminate, mostly with persistent style, incompletely bilocular (septum 1/2−2/3 of the fruit’s hight); valves thin, densely very densely covered with subappressed to ascending black hairs 0.1−0.3 mm. Chromosome number: 2n = 16 (TAKHTAJAN 1990: as A. oroboides).
