Leaves on main stems alternate, those on branches subopposite; petiole 2-3 mm, white villous; blade broadly cordate, cordate, or ovate, 1-3 × 1-2.4 cm, abaxially sparsely white hirsute, adaxially densely white hirsute, subentire, apex acute or obtuse. Flowers solitary, rarely several, terminal on main stems and branches, slightly pendent; pedicels 1-8 cm. Calyx lobes ovate or lanceolate, 7-20 × 2-7 mm, densely white hispidulous but usually more sparsely or even becoming glabrous toward base, margin entire, apex acute or obtuse. Corolla pale blue, often with red-purple spots at base inside, subglobose-campanulate, 2-4.5 × 2.5-3 cm, shallowly lobed; lobes obtuse, involute, villous at apex and along veins on abaxial side. Fl. Jul-Sep, fr. Sep-Oct.
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