The Blue fountain bush (Rotheca serrata) belongs to Lamiaceae (the Mint family). It is an evergreen shrub that is native to eastern India, Sri Lanka, and Malaysia. It grows in forests and is 1 to 3 m tall. The square stem is sparsely branched. The leaves are oblong to obovate-oblong or elliptic to ovate, opposite or in three whorled. From June to December, white, blue or purple flowers bloom in conical inflorescences up to 25 cm long at the top of the stem. The corolla lobes are oblong to obovate, 6 to 12 mm long, with the upper four lobes nearly flattened and the lower one concave. Stamens are about 2 to 4 cm long, protruding and hairy at the base. The cotyledons are hairless, and the style is long and protruding. The fruit is a drupe, green when young, but turns black when ripe.