Plants perennial. Stems erect, 40-100 cm, robust, to 6 mm in diam. at base, striate, puberulent or subglabrous. Stem leaf blades broadly cordate-ovate to hastate-ovate, 10-16 × 6.5-14.5 cm, adaxially sparsely fine strigose, abaxially purple, sparsely puberulent along veins, sparsely yellowish glandular, base cordate to subhastate, margin double crenate or dentate, apex acuminate or caudate-acuminate. Verticillasters 2(-6)-flowered, widely spaced, in raceme-panicles; rachis glandular pubescent or subglabrous; bracts lanceolate to broadly ovate, 5-8(-10) × 1.5-3 mm. Pedicel ca. 2 mm, glandular pubescent or subglabrous. Calyx narrow campanulate, 1-1.5 cm, glandular pilose on veins, sparsely yellowish glandular; upper lip subtruncate, entire, apical mucro 1-2 mm; lower lip longer than upper, teeth triangular, apex acuminate; fruiting calyx dilated, ca. 1.3 cm wide at mouth. Corolla yellow, 2.5-3.5 cm, puberulent outside; tube gradually dilated adaxially at apex, curved upward from base, ca. 2-3.5 cm; upper lip broadly ovate, 7-8 × ca. 3.5 mm; lower lip longer than upper, middle lobe obcordate, ca. 4 × 6 mm; lateral lobes ca. 3 mm wide. Filaments ca. 6 mm; connectives arcuate, ca. 6 mm, arms subequal. Style exserted. Nutlets obovoid, ca. 3 mm in diam., brown. Fl. Jul-Sep.
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