Roots carrot-shaped, 14-15 × 0.7-1 cm. Main stems erect or ascending, 15-25 cm, or even longer, glabrous or sparsely white hirsute; branches aggregated at lower part, leafy, sterile, sparsely white hirsute. Leaves on main stems sparse and alternate, those on branches subopposite, rarely alternate; petiole 4-6 mm, glabrous or sparsely hirsute; blade ovate, 1.2-1.8 × 0.6-1.5 cm, abaxially sparsely white hispidulous, adaxially glabrous or subglabrous, base cordate or rounded, margin sinuous or subentire, recurved, apex acute or obtuse. Flowers solitary, terminal on main stems; pedicels sparsely hirsute. Calyx tube adnate to ovary up to middle, obconical or semiglobose, 10-ribbed; lobes triangular, 8-12 × 5-7 mm, both sides glabrous, margin entire or sinuous, recurved, apex acute or obtuse; sinus between lobes obtuse. Corolla purple-green with purple veins, broadly campanulate, 2.5-3 × 2.5-3 cm, glabrous; lobes deltoid-orbicular, equaling tube. Stamens glabrous; filaments slightly dilated at base, 6-8 mm; anthers 4-5 mm. Fl. Aug.
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