Description from Flora of China
Stem internodes 3.5-4.5 cm, much longer than leaves. Petiole slender, 6-8 mm; leaf blade subcircular, ca. 1.5 cm in diam., membranous, densely white hirsute, base shal-lowly cordate, margin crenate, apex obtuse to acute. Verticillasters 2-flowered, apical. Pedicel short. Calyx to 7 mm, 10-veined, densely white hirsute; throat pubescent, oblique; teeth subequal, ca. 2 mm, apex acuminate, slightly curved. Corolla ca. 1.4 cm, tube ca. 9 × 1.5 mm; upper lip ovate, galeate, ca. 4 mm, pubescent; lower lip wide, obliquely spreading, ca. 8 × 6 mm; middle lobe largest, subrhombic, ca. 4 × 5 mm, margin irregularly incised; lateral lobes ovate, ca. 1.5 mm wide. Nutlets brown, ca. 2 × 1.2 mm, adaxially ribbed. Fl. Jul.
Hills. Taiwan [Japan including Ryukyu Islands].