Rhizome elongate, slender, 1--2 mm thick, with numerous hairy roots. Stem simple or branched distally, 15--35 cm, glabrous. Leaves ovate-lanceolate or oblong-lanceolate, 5--8 × 2.5--4 cm, base cordate, margin ciliate-denticulate, apex mucronate. Peduncle axillary, 2--2.5 cm, jointed and geniculate near middle, with a swollen gland at joint, 1-flowered. Flowers nodding. Tepals yellowish, sometimes spotted with purple adaxially, oblong-lanceolate to lanceolate, 8--9 × 1--2 mm. Stamens 3.5--4.5 mm; filaments short, broad; anthers 3--4 mm. Ovary smooth. Style 3--4 mm; stigma deeply 3-lobed. Berry 6--8 mm in diam. Seeds elliptic. Fl. Jul, fr. Aug--Sep.
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