Plants glabrous throughout, or stems and leaves sparsely villous. Roots gray-yellow, tuberous or oblong, 1-3 cm in diam. Stems twining, green, white, or dark-purple, slender, glabrous or internodes sparsely villous. Leaves on main stems alternate, lanceolate or ovate, smaller, those on top of branches usually 3-5-fascicled, pseudoverticillate; petiole short; blade abaxially gray-green, adaxially green, elliptic, lanceolate, or oblong, 2-6 × 1-2.5 cm, abaxially glabrous or sparsely villous, adaxially glabrous, base attenuate, margin entire, occasionally revolute, apex acute or obtuse. Flowers solitary, terminal on slender branches; pedicels 2-5 cm; bracts single, small, lanceolate or narrowly ovate. Calyx tube adnate to ovary up to its middle, semiglobose; lobes narrowly lanceolate or ovate-deltoid, 10-20 × 6-8 mm, margin entire, apex acute. Corolla campanulate, 2-3 × 1.5-2.5 cm, shallowly lobed; lobes dark purple, deltoid, inside with remarkable black-purple stripes or black spots. Filaments 3-5 mm, slightly dilated at base; anthers 2-4 mm. Capsules hemispherical at base, rostrate toward apex, ca. 15 mm. Seeds numerous, dark brown, lucid, ovoid, wingless. Fl. Jul-Aug. 2n = 16.
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A bulb plant. It keeps growing from year to year. It grows 20 cm tall and 3 m wide. Plants produce round bulbs or tubers. The leaves are 10 cm long and narrow. The flowers are 2 cm long. The petals curl backwards.
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