Erect, procumbent or ascending perennial herb. Stems up to 75 cm long, 4-angular, hairless or finely velvety in the upper parts, sometimes with scattered stalked glands. Leaves more or less narrowly elliptic, up to 7 cm long, hairless on both sides or with sparse short hairs above. Flowers in 1-12-flowered clusters, together forming a spike-like or sometimes branched inflorescence up to 25 cm long; axes more or less densely velvety with scattered longer hairs, stalked glands and lanceolate to narrowly ovate leaf-like bracts, up to 1.5 cm long. Corolla white to pale yellowish with indistinct bluish veining, 11-14 mm long, 2-lipped; lower lip broadly obovate with red-tipped hairs, shallowly 3-lobed. Capsule 4-9 mm long, finely velvety with a few glands near the apex.