Prostanthera campbellii is a species of flowering plant in the family Lamiaceae and is endemic to the south-west of Western Australia. It is an erect shrub with linear leaves and white to cream-coloured flowers with purple striations.
Prostanthera campbellii is an erect shrub that typically grows to a height of . The leaves are linear, yellowish green, long, wide and sessile. The flowers are arranged singly in two to sixteen upper leaf axils, each flower on a pedicel long. The sepals are green and form a tube long with two lobes, the lower lobe long and the upper lobe long. The petals are white to cream-coloured with purple striations near the base of the lobes, long and fused to form a tube long. The lower lip has three lobes, the centre lobe spatula-shaped, long and wide and the side lobes long and wide. The upper lip has two lobes long and wide. Flowering occurs from July to November.[1]
Prostanthera campbellii was first formally described in 1882 by Ferdinand von Mueller in the journal Southern Science Record from specimens collected by John Forrest near the Gascoyne River.[2] [3] The specific epithet honours the politician Thomas Cockburn-Campbell.
This mintbush grows on granite outcrops and rocky places in the South-West and Eremaean botanical regions of Western Australia.
Prostanthera campbellii is classified as "not threatened" by the Western Australian Government Department of Parks and Wildlife.