Plants perennial. Stems 1 to few, ascending or erect, 30-60 cm, slender, finely retrorse pilose or puberulent. Leaves mostly basal, 1-3-pinnate; petioles 3.5-6.5 cm; leaflets sessile or short petiolate, variable; terminal leaflet largest, flabellate to ovate, 0.5-4 cm, adaxially sparsely strigose, abaxially sparsely fine pilose on veins, base cuneate-attenuate to rounded, margin crenate-serrate or 1-or 2-lobulate at base, apex obtuse to short acuminate; stem leaves 1-paired, petiole ca. 1 cm. Inflorescences finely pilose; verticillasters 4-10-flowered, 0.8-2 cm apart, mostly in panicles; bracts lanceolate, margin entire, subglabrous, slightly shorter than pedicels. Pedicel 1-2 mm. Calyx campanulate, 4-5.5 mm, sparsely puberulent on veins, 2-lipped to ca. 1/4 its length; upper lip semicircular, apex mucronate; lower lip strongly 2-toothed, teeth triangular, apex spinescent. Corolla sky blue to white-purple, 7-8 mm, glandular pubescent; tube obliquely pilose annulate inside, throat white pilose, included, gradually dilated to 2 mm wide at throat; upper lip ca. 2 mm, reflexed or nearly straight; lower lip somewhat shorter than upper lip. Filaments ca. 1 mm; connectives ca. 4 mm, upper arms ca. 2 × as long as abaxial, fertile. Fl. Jun.
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