Prostanthera

thumb|Prostanthera aspalathoides thumb|Prostanthera campbellii thumb|Prostanthera decussata thumb|Prostanthera grylloana thumb|Prostanthera hirtula thumb|Prostanthera lasianthos thumb|Prostanthera magnifica thumb|Prostanthera stenophylla thumb|Prostanthera striatiflora thumb|Prostanthera walteri

Prostanthera, commonly known as mintbush or mint bush, is a genus of about 100 species of flowering plants in the mint family Lamiaceae, and all are endemic to Australia. Plants are usually shrubs, rarely trees with leaves in opposite pairs. The flowers are arranged in panicles in the leaf axils or on the ends of branchlets. The sepals are joined at the base with two lobes. The petals are usually blue to purple or white, joined in a tube with two "lips", the lower lip with three lobes and the upper lip with two lobes or notched.