A perennial or semi-shrub, variably succulent herb, non-tuberous; leaves broadlyovate; flowers in dense verticillasters disposed in terminal spike-like inflorescence;corolla 8-12mm long, pinkish-lilac to blue; nutlets flattened globose. (Philippines) Perennial succulent aromatic herb, 20 - 50cm high. Lower part of the stem woody.Leaves opposite, thick, succulent, crenate, pale-green on both sides. Inflorescence inelongate and terminal raceme; flowers closely whorled, small and purple. Fruit of 4reddish-brown nutlets (Vietnam)