Rhizome terete, 3--5 mm thick, slender. Stem erect, 40--80 cm, glabrous. Leaves in whorls of 3 or 4, sometimes also alternate or opposite in proximal part of stem, sessile, lanceolate to linear-lanceolate, 7--12 × 1--1.6 cm, apex acute. Inflorescences 1-or 2-flowered; peduncle 1--1.5 cm; bracts very small. Pedicel 1--4 mm. Perianth pale purple, cylindric, 1--1.2 cm; lobes 1.5--2 mm. Filaments very short, less than 1 mm, glabrous; anthers 1.5--1.8 mm. Ovary ca. 2 mm. Style ca. 2 mm. Berries 7--11 mm in diam., 2--7-seeded. Fl. May, fr. Oct. 2 n = 28.
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