Herbs perennial. Stems numerous, erect, (30-)50-100 (-150) cm, puberulent. Leaves opposite; petiole 1-5 cm; leaf blade broadly elliptic to circular-ovate, (2.5-)5-7 × (2-)3.5-5.5 cm, papery, adaxially sparsely strigose-hispidulous, pubescent on veins, abaxially glabrous, sparsely puberulent on veins, base abruptly attenuate-decurrent, margin irregularly serrate-dentate, apex long acuminate, sometimes ± excised. Panicles terminal or axillary, 6-15 cm, densely pubescent; cymes pedunculate, 3-5-flowered; floral leaves subsessile; bracts linear. Pedicel 2-6 mm. Calyx campanulate, to 3.5 mm, puberulent; teeth spinescent, upper 3 triangular, lower 2 narrowly triangular; fruiting calyx dilated to 7 mm. Corolla white, reddish, or purplish to purple-blue, ca. 1 cm, sparsely puberulent, glandular, tube ca. 6 mm, upper lip ca. 3 mm, lower lip ca. 4 mm. Stamens included. Style included or slightly exserted. Nutlets brown, ± globose, ca. 1.5 mm in diam., glabrous. Fl. Jul-Sep, fr. Aug-Oct.
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