Twining shrubs; branchlets glabrous, lenticels sparse orbicular or elliptic; axillary buds approximately globose, rarely ovate-orbicular, 1.5-2.5 mm. Petiole 1-1.7 cm; leaf blade ovate, rectangular-ovate, or rectangular-elliptic, 6-12 × 3.5-7 cm, glabrous or rarely abaxially pubescent on veins, base rounded, rarely broadly cuneate, margin with recurved glandular teeth, apex shortly acuminate, rarely narrowly acute; secondary veins 6 or 7 pairs, prominent on both surfaces. Terminal thyrses 6-18 cm, axillary inflorescences short, 3-4 cm; pedicels 4-6 mm, jointed generally below middle. Sepals ciliate; petals obovate-rectangular or approximately obovate, 3-3.5 × 1.5-2 mm. Disk slightly cupuliform, lobe broadly rounded. Stamens ± shorter than corolla, or as long as corolla; filament conical-linear; anther rectangular-elliptic; staminodes in female flowers ca. 1 mm. Pistils ca. 3.5 mm; ovary approximately globose; styles stout; pistillodes in male flowers ca. 1 mm. Capsule globose, ca. 9 × 8 mm, adaxial side of valves with small brown macula. Seeds elliptic, ca. 4 × 2 mm. Fl. May-Jul, fr. Aug-Sep.
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