Caudexes robust, branched. Stems decumbent, slender, 14-27 cm, sparsely arachnoid-villous, sterile-branched at middle. Leaves alternate, subsessile, those of main stem with blade cordate to triangular-ovate, 10-15 × 5-9 mm, abaxially sparsely villous, adaxially glabrous or sparsely puberulent, base cordate, obtuse, or rounded, margin serrate, apex acute or obtuse; leaves on sterile branches with blade much smaller, elliptic-ovate, almost entire, base rounded or rarely cordate. Flowers solitary and terminal; pedicels 5-18 mm, brown-or black setose. Calyx densely brown-or black setose; tube cylindrical, 11-16 × 5-8 mm, base truncate; lobes lanceolate-triangular, slightly shorter than tube, inside both black-and white villous. Corolla blue or pale blue, cylindrical-campanulate, 2.5-3.5 cm, densely villous at throat; lobes oblong, 12-15 × 5-6 mm. Ovary conical-ovoid, slightly shorter than calyx; style extending up to corolla throat. Fl. Aug.
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