Prostanthera lanceolata is a species of flowering plant in the family Lamiaceae and is endemic to near-coastal area of eastern Australia. It is an erect, aromatic shrub that has stems that are square in cross-section, glandular, egg-shaped leaves and mauve or deep bluish-purple flowers.
Prostanthera lanceolata is an erect, aromatic shrub that typically grows to a height of and has branches that are square in cross-section. The leaves are mid to dark green, paler below, narrow egg-shaped to egg-shaped, long and wide on a petiole long. The flowers are arranged in bunches near the ends of branchlets with bracteoles about long at the base, but that fall off as the flower develops. The sepals are about long, forming a tube about long with two lobes, the upper lobe long. The petals are mauve to deep bluish-purple and long. Flowering occurs in spring.[1] This species is included in Prostanthera ovalifolia in Queensland.
Prostanthera lanceolata was first formally described in 1928 by Karel Domin in Bibliotheca Botanica from material he collected near the "Tambourine Mountains" in 1910.[2]
This mintbush grows in forest in near-coastal areas of New South Wales and Queensland.