Description from Flora of China
Subshrubs. Stems unbranched, suberect or flexuous, retrorse fine pubescent, ca. 55 cm tall, leafy toward apex, base prostrate, rooting from nodes. Petiole 4-5 cm, pubescent; leaf blade elliptic to elliptic-ovate, 18-19 × 8-9 cm, membranous, adaxially sparsely strigose, abaxially glaucous, puberulent or glabrescent, pubescent on midrib, base obtuse to broadly acute, margin crenate-dentate, apex acute to acuminate. Verticillasters fascicled, globose, densely hirsute; bracteoles linear-lanceolate to awnlike, ca. 5 × 0.5-1 mm, sparsely villous. Flowers subsessile. Calyx obconical-campanulate, ca. 1 cm, to 7 mm wide at throat, leathery, densely tomentose outside; teeth spreading, lanceolate-triangular, apex acute. Corolla gray-yellow, exserted, ca. 2 cm; upper lip spatulate, rounded, hirsute on back outside; lower lip hirsute at base outside. Stamens nearly included. Fl. Aug.