A low, much-branched, wiry, shrublike perennial with square stems and aromatic leaves. Flowers small, in tufts arising from leaf axils, purple to lavender, each flower with a tiny, 2-lobed upper and a broader 3-lobed lower lip. Blooms July-November. Leaves opposite, sessile, almost triangular with a broad base and a lancelike point, finely toothed. The green parts have a delightful fragrance.