Orthosiphon thymiflorus (Roth) Sleesen

thymiflorus: with flowers like thyme.

Straggling, somewhat shrubby perennial herb, up to 1.5 m tall, not or hardly aromatic. Stems several ascending to erect, 4-angled, normally well branched, retrorsely pubescent along the angles, sometimes with dense spreading hairs. Leaves ovate to elliptic, usually 1-4 cm long, but larger in well-shaded plants, glandular punctate and hairless or pubescent above, pubescent, particularly along the veins beneath; margin scalloped or toothed; petiole up to 25 mm long. Inflorescence fairly lax with 6-flowered verticils 8-20 mm apart; bracts 2-3 mm long, ovate-triangular. Calyx 3-4 mm long, conspicuously purple on the upper lip, green otherwise; lobes of lower lip awn-like, 2-3 mm long. Corolla usually pink, sometimes white or mauve, 8-16 mm long; tube straight.

Widespread in tropical Africa, South Africa, Madagascar and tropical Asia from India and Sri lanka to China and Indonesia.