Roots carrot-shaped, 15 × 0.5 cm. Main stems erect or ascending, 25-55 cm tall, sparsely white villous; branches aggregated at lower part, leafy, sterile, 1-10 cm, densely villous. Leaves on main stems alternate, those on branches subopposite; petiole 1-2.5 mm, densely villous; blade cordate, broadly ovate, or ovate, 8-18 × 8-14 mm, white villous, base cordate or rounded, margin sinuous or obscurely crenate, or subentire, apex acute or obtuse. Flowers solitary, terminal on main stems, slightly pendent; pedicels 4-8 cm, glabrous or villous. Calyx tube adnate to ovary up to middle, hemispheric, sparsely villous; lobes deltoid or ovate, 8-10 mm, both sides sparsely hispidulous, margin somewhat sinuous, revolute, apex acute; sinus between lobes narrow and pointed, or broad and obtuse due to being revolute. Corolla pale blue but tube purplish, tubular-campanulate, 2.2-3 cm, shallowly lobed; lobes broad, margin and apex involute; tube 1-1.2 cm in diam.; limb 2-3.5 cm in diam. Stamens glabrous; filaments ca. 6 mm; anthers ca. 5 mm. Capsule hemispheric at base, conical toward apex, rostrate, 2-2.4 × 1-1.5 cm; persistent calyx lobes revolute. Seeds numerous, brown-yellow, ellipsoid, ca. 1.5 mm. Fl. Jul-Sep, fr. Sep-Oct.
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