Roots carrot-shaped, 10-20 × 0.5-2 cm, simple or branched below middle. Stems usually 1-3 m and twining, rarely ascending and 50-75 cm, branched; branches and branchlets both leafy, sterile or with a terminal flower, subglabrous or sparsely villous. Leaves opposite or tending to alternate at top of stems and branches; petiole short, 1-7 mm, puberulent; blade abaxially gray-green, adaxially green, lanceolate, ovate, or elliptic, 2.5-8 × 0.7-4 cm, abaxially sparsely or densely puberulent, adaxially hispidulous, base cuneate or rounded, margin crenate or subentire, apex acute or obtuse. Flowers terminal; pedicels 1-6 cm, villous. Calyx tube adnate to ovary up to middle, hemispheric, subglabrous to densely villous; lobes broadly ovate, 10-18 × 5.5-12 mm, ciliate, abaxially sparsely villous, adaxially glabrous, margins crenate or verrucose toothed, apex obtuse or acute. Corolla yellow-green, tubular, 2-3.7 × 0.5-1.6 cm, glabrous, shallowly lobed; lobes deltoid, acute at apex. Filaments dilated at base, ca. 10 mm, ciliate; anthers 3-5 mm. Capsule globose below, conical above. Seeds brown-yellow, ovoid, wingless, smooth. Fl. and fr. Jul-Oct.
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A herb. It keeps growing from year to year. The roots are carrot-shaped. They are 10-20 cm long by 1-2 cm wide. The stems are usually twining and 1-3 m long. The leaves are opposite. They are 3-8 cm long by 1-4 cm wide. They are grey-green underneath. The flowers are tube shaped and yellow-green.
It is a temperate plant. It grows in south western China. It grows in mountain scrub and grasslands between 1,900-3,000 m above sea level. In Sichuan and Yunnan.
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Mountain scrub, grasslands; at elevations from 1,900-3,000 metres. Alpine brush and rocky slopes.
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