Roots carrot-shaped or cylindrical, 20-30 × 1.5-2.5 cm. Stems erect, climbing, or ascending, up to 2 m, branched; branches and branchlets leafy, sterile or with a terminal flower, sparsely puberulent. Leaves alternate or those on branches subopposite; petiole 1-6 cm, sparsely villous; blade abaxially gray-white, adaxially green, broadly ovate, triangular-ovate, ovate, or ovate-lanceolate, 3-9 × 1.5-7 cm, abaxially sparsely or densely puberulent, adaxially sparsely puberulent, base truncate, cuneate, or rounded, margin irregularly pinnatifid to shallowly lobed, or dentate, crenate, or rarely subentire, apex acute or obtuse. Flowers terminal, long pedicellate; pedicels villous or occasionally subglabrous. Calyx tube adnate to ovary up to middle, 10-ribbed, glabrous or sparsely villous; lobes ovate or deltoid, 10-25 × 5-15 mm, both surfaces glabrous, margin crenulate, ciliate, apex acuminate, acute, or obtuse; sinus between lobes narrow and pointed. Corolla yellow-green, pale brown-red at base, tubular, 2-4 × 1.5-2 cm, glabrous, shallowly lobed; lobes triangular, apex acute. Stamens villous; filaments slightly dilated at base, 6-10 mm; anthers 5-6 mm. Capsule 1.2-1.6 cm in diam. Seeds brown-yellow, ovoid, wingless. Fl. and fr. Jul-Oct.
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