Plants glabrous or subglabrous or only leaves sparsely shortly setose. Stems twining, more than 1 m, with a few very short branches. Leaves on main stems lax, alternate, ca. 10 cm distant between 2 leaves; petiole filiform, 5-9 cm; blade abaxially gray-green, adaxially green, broadly ovate, up to 10 × 7 cm, base subcordate, with a square sinus, subentire, apex shortly acuminate or acute; veins conspicuous, lateral veins from base; leaves on branches usually only 2 and opposite, petiole less than 1 cm, blade similar to those on main stems in shape, but sinus not square. Flowers solitary, opposite to leaves; pedicels 3-6 cm. Calyx tube adnate to ovary up to its middle, semiglobose; lobes deltoid-lanceolate, ca. 10 × 5-6 mm, margin entire, apex acuminate; sinus between calyx lobes narrow. Corolla campanulate, 1.7-1.8 × 1-1.2 cm, 5-lobed to middle; lobes dark blue, lanceolate-deltoid. Filaments dilated at base, ca. 5 mm; anthers ca. 5 mm. Capsule semiglobose in lower half, rostrate above, ca. 1.5 cm in diam. Seeds numerous, brown, ellipsoid, obscurely reticulate. Fl. and fr. Sep-Oct.
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A herb that keeps growing from year to year. The stems are twining and 1 m long. The leaves on the main stem are lax and alternate. They are 10 cm long by 7 cm wide. There are usually only two leaves on branches. The flowers are dark blue.
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