Archidendron tonkinense I.C.Nielsen

Trees, small, 5-7 m tall. Branchlets brown, terete, gla­brous, with small lenticels. Leaf petiole ca. 2.5 cm; petiolar gland raised, subglobose, hollow, 0.5-1 mm high, 0.5-1.5 mm in diam.; pinnae 1 pair; petiolules 2-3 mm; leaflets 2 or 3 pairs, opposite or subopposite, oblong or elliptic, (2.5-)5.5-10 × (1-)2-3.5 cm, both surfaces glabrous, lateral veins 4 pairs, raised abaxially, inconspicuous adaxially, base narrowly cune­ate, apex obtuse-acuminate. Heads 12-15-flowered, ca. 1.2 cm in diam. (including filaments), arranged in panicles to 10 cm. Calyx ca. 2 mm; teeth deltoid, ca. 0.5 mm, densely ferruginous pubescent. Corolla campanulate or funnel-shaped, ca. 5.5 mm, sericeous; lobes narrowly oblong, ca. 2 mm. Staminal tube shorter than corolla tube, ca. 3 mm. Ovary ca. 1.5 mm, gla­brous; stipe ca. 1.5 mm. Legume ovoid, 7-8 × ca. 5 cm, gla­brous, dehiscent along both sutures; valves brown. Seeds 2, brown, turbinate, 3-4 cm high, ca. 3.5 cm in diam.