Erect shrubs. Branchlets terete, with longitudinal ridges, glabrous. Leaves 2-or 3-pinnate; stipules broadly obovate, 3-3.5 × 2-2.5 cm, apex rounded, glabrous; petiole 7-21 cm, central petiolules 1.5-2.3 cm, lateral petiolules 1.5-4 cm, glabrous; leaflets ovate-oblong or elliptic-lanceolate, 5-17 × 2-6.5 cm, base suborbicular or broadly cuneate, margin with irregular teeth, apex acuminate or caudate, glabrous; lateral veins 5-14 pairs, abaxial veinlets conspicuous but not protruding. Inflorescences leaf-opposed; peduncle very short, ferruginous pubescent; bracts ovate, 3.5-5 × 3-4 mm, glabrous, apex acuminate or mucronate. Pedicels ca. 1 mm, with brown hairs; buds oblate, 2-2.5 mm, apex truncate or obtuse. Calyx tube cupulate with 5 triangular denticles, glabrous. Petals 5, elliptic, 1.5-2 mm, glabrous. Staminodial tube 0.7-1 mm, with lower fused part 0.25-0.35 mm. Stamens 5; filaments 1.3-1.8 mm; anthers elliptic and yellow, 0.8-1.2 mm. Ovary ovate; style 0.6-0.9 mm, base slightly enlarged; stigma not expanded. Fl. May.
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