Decumbent to ascending shrublet up to 0.2 m tall with branches up to more than 0.5 m long, slender, slightly angular, glabrous, greenish on youngest parts. Leaves linear or narrowly lanceolate, 7-20 x 0.8-3 mm, apically spine-tipped, glabrous (or with few spreading hairs), smooth above, with 3 ± distinct veins below (apart from margins). Inflorescence usually consisting of one rather long-pedicellate flower, terminating the shoot, on a ± short, not peduncle-like branch. A lateral branch developing rapidly in the uppermost leaf axil pushing the inflorescence (flower) aside to a lateral position. Bract present as a less than 0.4 mm long triangular 'tip' at pedicel base (or lacking). Pedicel generally 4-10(->12) mm long (depending on age), glabrous, merging into calyx base. Bracteoles sometimes visible as minute teeth or scars on the pedicel. Calyx campanulate-tubular, glabrous, smooth; lobes very narrowly triangular(-subulate), 2.4-4.2 mm long, acuminate, glabrous. Petals yellow, turning reddish. Standard blade obovate, 6-8.5 x 5-8.2 mm, rounded-retuse, without apical 'tip', puberulous-tomentose or partly sericeous on most of the back (base partly glabrous). Wing blades narrowly obovate or elliptic, 5-7.5 x 2-3 mm, glabrous or with some pubescence on lower parts near middle, with ±6 rows of minute folds on the upper basal half. Keel blades 4.8-6.2 x 2.4-3.5 mm, tomentose on lower apical half, with ± straight upper margin. Pistil glabrous; ovary elongate; ovules 10-16. Pod linear, 20-28 x 3.3-4.3 mm, glabrous, smooth, often slightly upcurved.
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Slender, decumbent to ascending shrublet to 20 cm. Leaves 1-foliolate, linear-lanceolate, pungent, sometimes softly hairy, 3-veined from base. Flowers solitary on long pedicels, yellow, fading reddish, wings sometimes hairy, keel hairy, calyx glabrous, lobes narrowly triangular to awl-shaped.