Stems to 5.5 m, climbing, branched distally; internodes 2--18 cm. Leaf sheaths 1.5--4.5 cm, puberulent, mouth hirsute-ciliate; petiole 3--10 mm; leaf blade narrowly elliptic, 6--12 × 1.5--3 cm, with a line of white-hirsute hairs near margin of adaxial surface, abaxially glabrous, base cuneate or obtuse, apex caudate-acuminate. Heads with 2--6 flowers; bracts broadly ovate, ca. 2.5 mm. Sepals oblong, carinate, 5--6 × 2--3 mm, sometimes puberulent or pubescent-ciliate. Petals white, broadly elliptic, 5--6 × ca. 3 mm. Filaments ca. 7 mm, lanate with white, multicellular hairs distally; anthers oblong or subglobose, 1--1.2 × ca. 1 mm, dehiscent by apical pores. Ovary sparsely puberulent, ca. 1.2 mm. Style ca. 1 cm. Capsule ellipsoid, trigonous, ca. 9 × 6--7 mm, glabrous. Seeds 1 or 2 per valve, 3--6 mm. Fl. and fr. summer.
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