Plants perennial. Stems 1 or 2, 45-90 cm tall, ascending to erect, unbranched, villous toward apex, glabrescent toward base. Petiole 2-13 cm; leaf blade ovate-triangular to ovate-hastate, 3-8.5(-14) × ca. 8.5(-14) cm, papery, adaxially pilose, abaxially pilose along veins, sparsely yellow-brown glandular, base cordate, margin irregularly crenate, apex obtuse to acute. Inflorescences densely villous; verticillasters 2-4-flowered, in racemes or raceme-panicles; bracts broadly ovate to subcircular, shorter than calyx. Pedicel ca. 4 mm. Calyx broadly tubular-campanulate, 1.7-2.2 cm, villous mainly along veins and margin, sparsely yellow-brown glandular; tube ca. 1.5 cm; upper lip semicircular-triangular, ca. 4 × 13 mm; lower lip shallowly 2-toothed, teeth broadly triangular, apex acute. Corolla yellow, (2.2-)3.5-3.8 cm; tube sparsely pilose or subglabrous, pilose annulate inside, ca. 3 mm wide at base, adaxially gradually dilated to 1.4 cm wide at throat; limb pilose, ciliate; upper lip ca. 1 cm, straight; lower lip to 1.7 cm, middle lobe flabellate, ca. 0.6 × 1.3-1.5 cm; lateral lobes obliquely ovate, to 5 mm. Filaments ca. 6 mm; connectives ca. 9 mm, upper arms ca. 6 mm. Style exserted. Nutlets obovoid. Fl. Jul-Sep.
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