Plectranthus L’Hér.

28 species in Aust. (22 endemic, 6 naturalized); all states and territories except Tas.

Perennial herbs or shrubs, usually rather succulent, variously pubescent with glandular and simple hairs and with yellowish sessile glands. Leaves ovate to orbicular, serrate, obtuse or cordate at the base. Flowers in terminal leafless thyrses with 3–10 flowers per cyme. Calyx 2-lipped; upper lip broad, entire; lower lip with 4 lanceolate teeth. Corolla bluish purple; tube twice as long as the calyx; upper lip 4-lobed; lower lip entire, concave, enclosing the 4 stamens.