Stems to 4 m, climbing, branched distally, glabrous; internodes 5--20 cm. Leaf sheaths 2.5--6 cm, hirsute when young, glabrescent, mouth hirsute-ciliate; petiole 5--7 mm; leaf blade elliptic to lanceolate, 8--16 × 2--4.5 cm, abaxially ± hirsute, base rounded to broadly cuneate, apex acuminate or caudate-acuminate. Heads with several flowers; bracts ovate-orbicular, ca. 3 mm. Sepals oblong, carinate, 5--7 × ca. 3 mm, abaxially hirsute. Petals pink, oblong, ca. 7 × ca. 3 mm. Filaments ca. 7 mm; anthers drip-shaped, ca. 2 × 1.5 mm, dehiscent by apical pores. Ovary ca. 1 mm, hirsute. Style ca. 4 mm. Capsule ovoid-globose, trigonous, 7--9 × 5--6 mm, hirsute. Seeds 2 per valve, 3--4 mm. Fl. Apr--Aug.
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