Plants aromatic, perennial. Stems 30-90 cm, densely pubescent with a mixture of villous and glandular pilose hairs. Petiole 2-16 cm; leaf blade broadly cordate-ovate to ovate-hastate, 4-22 × 3-18 cm, adaxially finely strigose, abaxially spreading pilose on veins, sparsely red-brown glandular, base cordate to hastate, margin dentate-crenate, apex acuminate. Inflorescences densely glandular pilose, villous; verticillasters 2-flowered, in loose, much branched raceme-panicles; bracts ovate to lanceolate-ovate, nearly as long as pedicels or slightly shorter than calyx. Pedicel ca. 5 mm. Calyx campanulate, 1.4-1.7 cm, enlarged in fruit, glandular villous, yellow-brown glandular outside; upper lip broadly triangular-ovate, margin entire, apex acuminate; lower teeth ovate-triangular, 4-5 mm, apex acuminate. Corolla yellow, 4-4.5 cm; tube ca. 3.3 cm, subglabrous, pilose annulate inside, slightly dilated at base, dilated and curved upward, ca. 1.1 cm wide at mouth; upper lip broadly ovate, ca. 1.2 cm, margin ciliate, densely brown glandular pilose outside; lower lip ca. 1.3 × 1.4 cm, middle lobe broadly obovate, ca. 0.9 × 1.3 cm, margin undulate; lateral lobes obliquely triangular-ovate, ca. 4 mm wide. Filaments ca. 8 mm; connectives ca. 1 cm, curved, semicircular, arms equal. Style slightly exserted. Nutlets brown, obovoid, ca. 2 mm, apex rounded. Fl. Aug-Sep.
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