Stems ca. 2.5 m, pubescent at apex, glabrescent at base. Petiole 1-2.8 cm; leaf blade ovate, (2-)5-7 × 1-3.5 cm, membranous, pubescent, base rounded to obtuse, margin coarsely serrate to serrate-crenate, apex acute. Verticillasters 2-10-flowered, widely spaced; upper bracts reduced; bracteoles linear to obovate-lanceolate, 3-6 × 1-2.5 mm, ciliate. Pedicel 3-7 mm. Calyx blue-purple, broadly campanulate, ca. 9 mm in flower, veins villous, inside glabrous; upper lip reflexed, ca. 4 × 4 mm, lateral teeth ± villous on outer margin; middle tooth erect, broadly triangular, apex acute; lower lip slightly longer, ca. 3 mm wide, 2-toothed to more than 1/2 its length, with lanceolate acuminate teeth; fruiting calyx dilated, to 1.3 cm, scarious, conspicuously netted. Corolla yellowish, 1.1 cm, villous outside; tube pubescent, gradually dilated beyond middle; upper lip ca. 4 × 3 mm, 2-lobed; lower lip as long as upper, to 6 mm wide, lobes circular. Stamens included. Immature nutlets brown, ca. 1 mm, corrugate. Fl. Jul-Aug.
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