Calothamnus planifolius is a plant in the myrtle family, Myrtaceae and is endemic to the south-west of Western Australia. It is an erect shrub with many branches, growing to a height of about 1.5m (04.9feet) with flat leaves and red flowers from September to November.[1] The flowers have 4 petals and 4 narrow bundles of stamens. (In 2014 Craven, Edwards and Cowley proposed that the species be renamed Melaleuca planifolia.)[2]
The species was first formally described by Johann Lehmmann in 1842 in Delectus Seminum quae in Horto Hamburgensium botanico e collectione.[3]
Calothamnus planifolius occurs in the Avon Wheatbelt and Jarrah Forest biogeographic regions where it grows in gravelly clay over laterite.[4] It is classified as "not threatened" by the Western Australian Government Department of Parks and Wildlife.