Shrub or liane, up to at least 6 m. high, with latex, glabrous; stems ± quadrangular, green and smooth at first, becoming terete, purplish and eventually grey, verruculose with numerous prominent lenticels. Leaves opposite or subopposite (alternate on climbing shoots), petiolate; lamina glossy on both sides, paler below, 4–10·5 × 2·1–4·7(5·8) cm., oblong to elliptic, acuminate at the apex, with margin densely serrulate to subentire, cuneate to decurrent at the base, chartaceous to subcoriaceous, with 7–10 lateral nerves and densely reticulate venation more prominent below than above; petiole 5–9 mm. long, with margins straight; stipules small, acicular-triangular, deciduous. Flowers 2–12 (rarely solitary), bisexual, in axillary sessile or shortly pedunculate fascicles; buds 2–3 mm. long, cylindric to elongate-conic; peduncles absent or up to 1 mm. long; pedicels 5–10 mm. long, smooth, articulated at the base. Sepals c. 0·5–0·-8 mm. long, subequal, united at the base, broadly ovate to triangular-ovate, acute to obtuse or rounded, with margin eroded-denticulate to subentire. Petals greenish-yellow to deep yellow, (2·5)3–4 mm. long, oblong to ovate, sessile or very shortly unguiculate, rounded, entire, reflexed at anthesis. Disk cylindric or deeply conic, sometimes fluted, with 5-lobed lower margin, surrounding the ovary. Stamens 3, with filaments scarcely broadened at the base; anthers dehiscing by 2 vertical or oblique clefts not confluent at the apex. Ovary ovoid-3-gonous, with style 1–2 mm. long, slender; stigma entire, punctiform; ovules 2(3–4) per loculus. Fruit orange to pinkish, 1·8–3 cm. in diam., globose, finely rugulose, c. 6-seeded.
