Vines. Roots ovoid-oblong. Stems sometimes branched, 20--100 cm × ca. 2.5 mm. Leaves opposite or whorled, subsessile; leaf blade narrowly ovate to linear, 1.5--7 × 0.2--1.2(--3) cm, veins 3--5, base rounded to cuneate, apex acute. Inflorescences axillary or at base of leaf midvein, erect, racemes, 1(or 2)-flowered; peduncle filiform, 1--2.5 cm; bracts setaceous, ca. 3 mm. Flowers opening fully or not. Perianth segments white tinged with pink, 20--25 × 5--8 mm, apex acute. Stamens shorter than perianth; filaments very short; anthers ca. 6 mm; adaxial appendage broad, ca. 5 mm, apex obtuse. Ovary obliquely ovoid, small; ovules 6. Capsule globose-ovoid, ca. 8 × 7 mm, ca. 5-seeded. Fl. Apr--Jul.
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