Between Sidalcea and Backhousia, which genus can only be naturally found in Australia?
Sidalcea:  It contains several species of flower known generally as checkerblooms or checkermallows, or prairie mallows in the United Kingdom. Sidalcea:  They can be annuals or perennials, some rhizomatous. Sidalcea:  They are native to West and Central North America. 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