Melolobium calycinum Benth.

Divaricately branched, spiny shrub. Leaves stipulate; leaflets oblong to broadly obovate, (1-)3-7 x 1-2 mm, densely hairy; petiole 2-4 mm long; stipules semi-cordate to auriculate, 3-5 x 2-2.5 mm, densely hairy. Inflorescence terminal, 12 mm long, 1-3-flowered; flowers 6-10 mm long; bracts ovate-lanceolate to cordate, 4-5 x 2-3(-4) mm; bracteoles narrowly ovate to lanceolate, 3-4 x 1-2 mm. Calyx shortly bilabiate, densely hairy; upper lobes acute; upper lip 5-6 mm long, the apices acute, upper sinus 2-3 mm deep; lateral sinus ±3.5 mm deep; lower lobes acute, 6-7 mm long, the apices acute, lower sinuses ±1 mm deep. Corolla yellow; standard ovate-oblong, 6-7 x 3-4 mm, with a well-developed, channelled claw ±2 mm long; wing petals oblong, sculptured, 67 x 1-2 mm, with a linear claw 2-3 mm long; keel petals shorter than the wing petals, 5-6 x 1-2 mm, with a linear claw 2-3 mm long. Gynoecium narrowly oblong, densely hairy. Fruit oblong, very short, straight to somewhat falcate, 6-10 x 2-3 mm, densely pilose, 1-2(-3)-seeded; seeds transversely oblong to round, 1.6-2.3 x 1.6-2.0 mm, pale yellow, olive, brown, light brown mottled greenish.