Shrubs scandent. Branchlets grayish brown or brown, terete, slender, with thin soft hairs, sparse, yellow glands, and small curved prickles. Leaves simple; petiole 1–2 cm, with thin soft hairs, sparse, yellow glands, and minute prickles; stipules caducous, lanceolate, 5–7 mm, margin entire or divided; blade ovate-lanceolate, 8–12 × 3–5 cm, lateral veins 7 or 8 pairs, raised abaxially, impressed adaxially, both surfaces yellow glandular, soft hairy only along veins, base rounded to subtruncate, margin with irregular long pointed sharp serrations, apex long caudate. Inflorescences terminal and axillary, terminal ones narrow cymose panicles, 8–14 cm, axillary ones subracemes, shorter; rachis and pedicels yellow glandular, thinly soft hairy; bracts lanceolate or linear, margin entire or divided. Pedicel ca. 1 cm. Flowers 6–8 mm in diam. Calyx abaxially subglabrous, yellow glandular; sepals triangular-ovate, 4–6 × 1.5–3 mm, margin entire, apex acuminate to shortly caudate. Petals greenish, oblong, shorter than sepals, apex obtuse. Stamens numerous, shorter than petals; filaments broad, complanate, glabrous. Pistils ca. 15–20, shorter than or nearly as long as stamens; ovary and style glabrous. Fruit unknown. Fl. Jun–Jul.

Dense forests; ca. 1700 m. NW Yunnan.