A decumbent or ascending, sparingly branched shrublet rarely ascending more than 0.3 m above the ground. Branches ascending, short-tomentose on the young parts, with rather prominent leaf base tubercles. Leaflets linear(-subulate), 3-7 mm long, subterete or angular, acute or acuminate, pale (greyish) green, glabrous or (those near the branch tips) with scattered hairs. Inflorescences unifloral, on lateral short-shoots and, besides, often 1 or 2 at the branch tip. Flowers rather large. Bract usually simple (rarely trifoliolate), linear, 3.5-6 x 0.5-1.1 mm, slightly flat, pale at the base, with distinct midvein. Pedicel very short. Bracteoles similar to the bract but longer, 4-7(-7.5) mm. Calyx tube pale, short-tomentose; lobes linear-lanceolate or tongue-like (hence the specific name), 6-10 x 1.2-2 mm, flat, with 3 or 5 ± distinct veins, ± green, partly subglabrous and green, partly puberulous, acute(-subobtuse). Petals pale yellow or often ± purplish. Standard blade circular, apically rounded, densely sericeous (-tomentose) on the back. Wing blades linear-elliptic, (6.5-)7.5-10.5 x 2.5-4 mm. Keel blades lunate, 8-10 x 3.7-4.5 mm, obtuse or rarely subacute, glabrous, with ± straight upper margin. Wing and keel claws adnate to the staminal sheath for their basal third. Pistil with short, narrow stipe; ovary sericeous on most parts.
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Sprawling shrublet, rarely higher than 30 cm. Leaves 3-foliolate, leaflets subterete-angular, glabrous. Flowers 1 or 2 at branch tips, pale yellow or ± purplish, wings and keel glabrous, calyx hairy, lobes tongue-like, with 3 or 5 distinct veins, subglabrous.