Cenesmon hainanense Merrill & Chun, Sunyatsenia 5: 94. 1940.

Subshrubs, climbing or twining, 2-3 m tall, grayish pubescent and with stinging hairs. Stipules triangular, 2-3.5 mm; petiole 1-2 cm, pubescent; leaf blade oblong, 3-8 × 2-4 cm, papery, abaxially tomentulose, adaxially pubescent, glabrescent, base obtuse or rounded, slightly peltate, margin entire or repand, apex acute or abruptly acuminate; basal veins 3-5, lateral veins 3 or 4 pairs. Racemes 3-5 cm, pubescent; peduncle 2-2.5 cm; female flowers 1 or 2, male flowers 7-10; bracts lanceolate, 1.5-2 mm, pilose. Male flowers: pedicel 1-2 mm; calyx ca. 2.5 mm in diam., pilose, calyx lobes ovate-triangular, ca. 2 mm; stamens ca. 1 mm. Female flowers: pedicel 2-3 mm; sepals 3, subovate, 4-5 mm, villous, enlarged to 5-6 × 4-5 mm in fruit; ovary hispid; style spreading, ca. 3 mm, plumose. Capsule oblate, ca. 4 × 8-10 mm in diam., hispid. Seeds globose, ca. 4 mm in diam., brownish marbled. Fl. Apr-Nov, fr. Jun-Dec.

● Seashores, fields, wastelands, thickets; below 100 m. S Guangdong, S Guangxi, Hainan.