Stems 7-15 cm, ascending, villous. Petiole of basal leaves 3-4 cm, cauline leaves 2-paired, similar to basal leaves but smaller, short petiolate or subsessile, sparsely hairy; leaf blade ovate-oblong, to 3 × 1.5 cm, sparsely strigose, base truncate to cordate, margin crenate, apex subrounded. Verticillasters in terminal capitula ca. 3 cm in diam.; bracts oblanceolate to narrowly oblong, 8-10 mm, margin ciliate, 5-serrate at apex, teeth long spinescent. Calyx 1.1-1.5 cm, glabrous, tube erect, teeth equal; adaxial middle tooth broadly elliptic, ca. 3 mm wide, apex obtuse, short spinescent or sometimes gradually wider with apex irregularly spinescent-serrulate, ciliate; other 4 teeth triangular-lanceolate, apex spinescent-acuminate, sparsely ciliate or glabrous. Corolla dark blue, 2.2-2.5 cm, densely white villous, tube base narrower, to 5-7 mm wide at apex; upper lip 2-lobed; lower lip spotted, 3-lobed, middle lobe elongated. Fl. Jul-Aug.
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