Plants perennial. Stems 30-60 cm, densely villous. Leaves usually basal; petiole 6-8 cm; leaf blade oblong-elliptic, 3.5-11 × 2-5 cm, base rounded to cordate, margin crenate, apex obtuse to rounded. Verticillasters 4-6-flowered, 3-8 in terminal racemes or panicles ca. 13 cm; rachis densely villous; bracts obovate to ovate. Pedicel 3-4 mm, densely villous. Calyx campanulate, 1-1.2 cm, ca. 1 cm wide when open, green, purple veined, villous; upper lip broadly triangular, 2-2.5 × 5.6 mm, apex 3-mucronate; lower lip slightly longer, teeth broadly triangular, apex acute. Corolla yellow with purplish spots, 3.3-3.5 cm, finely pilose; tube pilose annulate inside, exserted, ca. 2.4 cm, ca. 2.5 mm wide at base, gradually curved, dilated upward, to 1 cm wide at throat; upper lip oblong, ca. 8 × 7 mm; lower lip longer than upper, ca. 1.2 × 1.3 cm; middle lobe obcordate, to 1 cm wide; lateral lobes semicircular, ca. 4 mm wide. Stamens slightly exserted; filaments ca. 7 mm; connectives ca. 6 mm, arcuate, arms subequal. Style much exserted. Nutlets gray-black, obovoid, adaxially ribbed, ca. 4 × 2.5 mm. Fl. Apr-Jun.
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