Trees, to 6 m tall. Branchlets brown, yellow pubescent. Leaf petiole 2.5-6 cm, with globose gland above middle; pinnae 1 pair; pinna rachis 10-13 cm, sparsely pubescent; petiolules 5-7 mm; leaflets 3 pairs, alternate except terminal opposite pair, oblong, 7-15 × 4-8 cm, lateral veins 3-5 pairs, base acute, apex acuminate. Heads more than 20-flowered, arranged in panicles. Calyx tubular, ca. 4 mm, 5-toothed, sparsely pubescent. Corolla tube ca. 5 mm; lobes lanceolate, ca. 4 mm, yellow pubescent. Filaments ca. 1.5 cm. Ovary glabrous. Legume cylindric, 18-21 × 4-5 cm, dehiscent along both sutures. Seeds broadly cylindric, ca. 2.8 cm high, ca. 3.5 cm in diam. Fl. Mar, fr. Nov.
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