Leaves on main stems alternate, mostly yellow scaly, only several upper ones green and ordinary, those on branches opposite or subopposite, all ordinary leaves with petiole 2-3 mm; blade cordate or cordate-ovate, 5-9 × ca. 5 mm, both surfaces rather densely white hispidulous, margin entire, apex obtuse. Calyx lobes ovate-oblong or ovate-lanceolate, ca. 8 × 4-5.5 mm, rather densely hispidulous, margin recurved, entire. Corolla pale blue or pale purple with dark purple veins, campanulate or broadly campanulate, 2-3 cm; lobes suborbicular, 8-12 mm, apex obtuse or acute. Fl. Jul-Sep, fr. Sep-Oct.
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