Callistemon viminalis 'Violaceus'

At least 3 different mauvish-flowered cultivars have been sold under this name.The most commonly available one is probably C. citrinus, although C. rugulosus also appears to have a mauvish-flowered form also sold under this name.

kingdom Plantae
phylum   Tracheophyta
class    Magnoliopsida
superorder     Rosanae
order      Myrtales
family       Myrtaceae
genus        Callistemon R.Br.