Between Sidalcea and Backhousia, which genus can only be naturally found in Australia?
Sidalcea:  They can be annuals or perennials, some rhizomatous. Sidalcea:  They are native to West and Central North America. Backhousia: Backhousia is a genus of thirteen currently known species of flowering plants in the family Myrtaceae. Backhousia:  All the currently known species grow naturally only (endemic) in Australia in the rainforests and seasonally dry forests of Queensland, New South Wales and Western Australia.
i don't know