Shrubs to 1.5 m tall. Stems 4-angled, subglabrous. Petiole 0-4 mm; leaf blade narrowly obovate to oblanceolate, 20-24 × 6-8 cm, abaxially glabrous, adaxially slightly pubescent, secondary veins 8-10 on each side of midvein, base attenuate and decurrent onto petiole, margin slightly undulate to subentire, apex acute. Panicles terminal, 12-15 × 8-9 cm; bracts leaflike, lanceolate, 0.8-1.2 × 0.3-0.4 cm. Flowers pedicellate. Calyx lobes linear, ca. 10 × 1.5 mm, pubescent, 1-veined, apex acute. Corolla white, fragrant, outside gland-tipped pubescent; tube ca. 4 cm; lower lip lobes elliptic, 2-2.5 cm; upper lip ca. 2 cm, apex 2-cleft. Stamens ca. 1 cm. Fl. Aug-Sep.
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