Herbs robust. Stems glabrous. Petiole 3-6 cm, adaxially dusty pubescent in shallow groove; leaf blade oblong-ovate, 6.5-15 × 4-8.5 cm, membranous, adaxially sparsely minutely hispid, abaxially glabrous, base subtruncate, attenuate-decurrent into narrowly winged petiole, margin coarsely mucronate-crenate, apex caudate-acuminate; lateral veins 4-6-paired. Panicles axillary and terminal, 5-13.5 × 2.5-5.5 cm, with lax, dichotomous, 3-15-flowered cymes, branches 1-sided; bracts absent or minute. Calyx ca. 4 × 2.5 mm, dusty glandular outside; teeth triangular-lanceolate, 1.1-1.7 mm, posterior tooth ca. 2 mm. Corolla yellow, ca. 2.5 cm, sparsely puberulent; tube ca. 2 mm wide at base, dilated to 7 mm at throat; upper lip ca. 9 mm, base with 2 triangular teeth; lower lip subcircular, reflexed, middle lobe circular, lateral lobes ovate-triangular. Filaments black-brown at apex. Nutlets black-brown, triquetrous, ovoid, ca. 1.6 × 1 mm, smooth, glabrous. Fl. Sep.
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