Description from Flora of China
Nepeta glechoma Bentham var. grandis A. Gray, Mem. Amer. Acad. Arts 6: 402. 1858; Glechoma hederacea Linnaeus var. grandis (A. Gray) Kudo.
Stems tufted, ca. 20 cm tall, erect becoming prostrate, base purple, pubescent. Petioles of basal leaves 3-4.5 cm, hirsute, upper petioles 2-3.5 cm, pilose; leaf blade reniform, 1.5-2 × 2-3 cm, herbaceous, adaxially strigose, abaxially pilose on veins, margin crenate, apex rounded. Verticillasters 2(-4)-flowered; bracts and bracteoles linear-subulate, ca. 2 mm, ciliate. Calyx tubular, slightly dilated at apex, 7-10 mm, villous; teeth ovate, 1.5-2 mm, apex needlelike, ciliate. Corolla purplish, straight, funnelform, 1.5-2 cm, villous outside, pilose on throat inside; adaxial lip straight, lobes subcircular, lower lip erect, middle lobe wide, flabellate, apex emarginate; lateral lobes ovate, as long as upper lip. Nutlets base slightly triquetrous, apex rounded. Fl. Apr-May, fr. Jun.
Wet areas, near houses. Jiangsu, Taiwan [Japan].