Herb or subshrub to 1.20 m; stem erect, green or brown, the pubescence fine, curved, generally retrorse, long, hirsute, whitish or yellowish; internodes 2.5-5.5 mm, roots fibrous, branched; rhizome thin, to 4 mm diam. Leaves alternate to subopposite; leaflets ovate, elliptic or subrhombic unequal, 10-38 mm long, 16-20 mm wide, obtuse or subacute basally cuneate or slightly cordate, the pubes-cence subappressed, even, scattered, above denser, glabrescent beneath, un-evenly ciliate; petiole filiform, ascendent to 4 cm long, pubescent, canaliculate, enlarged to the base, with hairs at its insertion. The inflorescences of bifid cymes, 10-12(-40)-flowered, peduncles filiform, pubescent as on the petioles up to 6 cm long, branches longer in the fruit, to 6 cm; bracts linear, acuminate, hirsute, 1-1.5 mm; pedicels articulate near the base 2-3 mm long. Flowers with the sepals green, ovate or elliptic, acuminate, 3 mm long, 0.75-1 mm wide, acute or rarely subacute, the margin hyaline, often apically ciliate, glabrous; petals yellow, ob-ovate-subspathulate 6-7 mm long; longer stamens ca. 2.5 cm long, ligulate under the middle, glabrous or pubescent; the shorter stamens 1.5-2 mm long, glabrous; pistil about equalling the longer stamens; styles pilose, the stigma enlarged, 2-lobulate, capitate, the carpels 1-2-ovuled, glabrous. Capsule subglobose ca. 3 mm long, glabrous, about equalling calyx; the carpels membranous, thin, gla-brous inside, 1-seeded; seeds brownish ca. 1.5 mm long, 8-ribbed in zigzag, deeply transversally striate with small tubercules on the intersections.
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