Rosellas are in a genus that consists of six species and nineteen subspecies.
These colourful parrots from Australia are in the genus Platycercus.
Platycercus means "broad-tailed" or "flat-tailed", which became "Rosehiller", and eventually "rosella". Vigors defined the genus Platycercus in 1825, based on the distinctive architecture of the feathers in the tail and wing, and designated the crimson rosella Platycercus elegans (as Platycercus pennantii) as the type species.
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Description
right|thumb|[[Green rosella in Tasmania. It is the largest rosella at long]]Ranging in size from , rosellas are medium-sized parrots with long tails. The juveniles of the blue-cheeked species, and western rosella, all have a distinctive green-based plumage, while immature plumage of the white-cheeked species is merely a duller version of the adults. Rosellas scratch their heads with the foot behind the wing.