Plants rhizomatous, perennial. Stems erect, 30-60 cm, puberulent, much branched. Petiole 2-10 mm; leaf blade ovate-lanceolate to oblong, 3-5(-7) × 0.8-3 cm, puberulent, base cuneate to rounded, margin remotely coarse dentate-serrate above base, apex acute. Verticillasters axillary, globose, ca. 1.8 cm in diam.; peduncle 0-3 mm. Pedicel slender, 2.5 mm. Calyx tubular-campanulate, ca. 2.5 mm, puberulent, glandular, obscurely 10-veined; teeth narrowly triangular-subulate, apex acuminate, ca. 1 mm. Corolla purplish or white, ca. 4 mm, puberulent; upper lobe largest, 2-lobulate; other lobes subequal, oblong, obtuse. Stamens ca. 5 mm. Nutlets yellow-brown, small pitted. Fl. Jul-Sep, fr. Oct.
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A herb which keeps growing from year to year. It has rhizomes or underground stems. The above ground stems are erect and 30-60 cm high. They are hairy. There are many branches. The leaf stalk is 2-10 mm long. The leaf blade is oval to sword shaped and 3-5 cm long by 0.8-3 cm wide. They are hairy. The edges have coarse teeth. The flower heads are about 1.8 cm across. The flowers are purplish or white.
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