Herbs erect, perennial. Stems tufted, 0.5-2 m, branched, sparsely spreading strigose, densely puberulent. Petiole 1.5-7(-11.5) cm; leaf blade ovate-cordate, 3.5-10.5(-19) × 3-9(-15) cm, thin papery, adaxially whitish floccose-pilose, abaxially spreading villous, sparsely yellow glandular, base cordate, margin crenate or dentate to entire, apex acute to acuminate, lateral veins 4-or 5-paired. Panicles terminal, spreading, ca. 2-5 cm wide, strigose and puberulent; cymes pedunculate, 9-11-flowered; floral leaves subsessile, similar to stem leaves, upper bractlike. Pedicel slender, to 5 mm. Calyx campanulate, ca. 3 × 2.5 mm, sparsely white strigose; teeth subequal, triangular-ovate, ca. 1/2 as long as calyx; fruiting calyx tubular-campanulate, base saccate-dilated, ± curved, ca. 5 × 3-3.5 mm, conspicuously 2-lipped. Corolla yellow, purple spotted on upper lip, rarely reddish, ca. 6 mm, puberulent, glandular, tube ca. 3 mm, upper and lower lips ca. 3 mm. Stamens included. Style included. Nutlets chestnut brown, triquetrous, ovoid, ca. 1.8 × 1.2 mm, obscurely rusty verruculose. Fl. Aug-Oct, fr. Oct-Nov.
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