Stems suberect, slender, unbranched, 15-40 cm, striate, densely puberulent, glabrescent. Petiole 1.5-5 cm, gradually reduced apically; leaf blade cordate to circular-cordate, sometimes ovate, lower stem leaf blades reniform, 2.5-5 cm wide, membranous, sparsely appressed white strigose, base cordate to subtruncate, margin coarsely crenate, apex obtuse to subacute. Verticillasters in lax inflorescences 4-10 cm; bracts ovate-oblong, ca. 5 × 2.5 mm, margin entire, glabrous; bracteoles linear, ca. 1 mm. Pedicel slender, 4-5 mm. Calyx ca. 4 × 2.5 mm, puberulent, lateral teeth of upper lip triangular, teeth of lower lip subulate-triangular; fruiting calyx ca. 8 × 3 mm, scarious, glabrescent, conspicuously 15-veined, with spinescent-tipped teeth; middle tooth of upper lip reflexed, decurrent, shorter than 2 anterior teeth. Corolla white; tube narrow, exserted, slightly dilated at apex; lobes of upper lip semicircular, as long as lateral lobes of lower lip; middle lobe of lower lip circular, margin entire, slightly concave; lateral lobes ovate, obtuse. Nutlets obscurely rugulose. Fl. Jun, fr. Jul.
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