Suffrutex, up to 0.7 m tall, erect; stems well branched below, annual, glabrous to densely pilose; lignotuber well developed. Leaves glabrous adaxially, sparsely sericeous to pilose abaxially; oblanceolate, elliptic or broadly obovate, 28-45(-90) x 5-20(-40) mm, apex acute or rounded, apiculate; petiole 3-8(-11) mm long, canaliculate; stipules sericeous abaxially, lanceolate to trapezoid, 6-25 x 2-5 mm, base broadly cuneate, apex acute, commonly the basal leaves are reduced to amplexicaule stipules. Inflorescence racemose, erect, 5-80-flowered, terminal, often subtended by axillary inflorescences; bracts elliptic to lanceolate, up to 3-14 x 0.5-2.0 mm, bracteoles setaceous to elliptic, 2-10 x 0.5-2.0 mm. Calyx sericeous, lateral sinuses 1-3 mm; upper lip 6-10(-12) mm long, lobes acute, 2-3 mm; lower lip 8-15 mm long, lobes acute, 1-3 mm long. Corolla bright to mustard-yellow, becoming black in dried specimens; standard 10-13 x 10-12 mm, obovate, adaxial surface sparsely sericeous, base cuneate, perpendicular to lamina, claw 2-5 mm long; wings obovate to cymbiform, 8-15 x 3.5-5.0 mm, with lunate-lamellate sculpturing in the upper basal and upper central zones, claw vertical, 1.5-3.5 mm long; keel acutely cymbiform, 7-9 x 3-4 mm, claw 2.5-3.0 mm long. Stamens monadelphous, sheath split adaxially. Ovary oblong 5-7 mm long, style 3-4 mm long. Fruit linear, compressed, erect, (30-)40-60(-80) x 4.0-5.5 mm, sparsely sericeous. Seed 2-3 mm in diameter, slightly compressed.
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Perennial, dwarf shrub, variable in habit, indumentum and leaf shape; populations often include broad-leaved, glabrescent and narrow-leaved, pilose individuals. In EC, narrow-leaved, pilose forms predominate and inflorescences are far more floriferous.
A shrub. It grows 1.5 m tall. It has a root tuber. Leaf shape can vary. The leaves are 3-4.5 cm long by 1-2 cm wide. The fruit is narrow and 4-6 cm long by 4-5.5 mm wide. The fruit are 2-3 mm across.
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