Stems long procumbent, internodes much longer than leaves. Petiole slender, 5-10 mm; leaf blade subcircular to reniform-circular, rarely subcordate, 1-1.5 × 1-1.5 cm, membranous, sparsely white hirsute, base shallowly cordate, margin remotely serrate, apex subrounded. Verticillasters 2-flowered, in apical axils, widely spaced or 3 or 4 in interrupted racemes; bracts oblong, base attenuate, margin entire, apex acute, ciliate. Pedicel ca. 1.5 mm. Calyx 5-6 mm, conspicuously 5-veined, veins white hirsute; teeth 1-1.5 mm, smaller than those of upper lip, apex callose-acute, slightly curved. Corolla red, ca. 1.4 cm, puberulent mainly abaxially, puberulent annulate inside; tube ca. 1.1 cm, subcylindrical, ca. 2 mm wide, slightly dilated at throat; upper lip ovate, ca. 3 mm, subgaleate; lower lip obliquely spreading, ca. 4 × 3 mm, 3-lobed; middle lobe largest, trapeziform, deeply lobulate; lateral lobes elliptic-obovate. Nutlets dark brown, ca. 2 × 1.5 mm. Fl. Jul-Aug, fr. Aug-Sep.
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