Idiospermum is a genus containing a single species of tree, Idiospermum australiense, found in Australian tropical rainforests. Scientists recognise them as one of the species of the earliest known lineages to have branched out from the first flowering plants and still living today. Since as long ago as 120 million years, they continue living today only in the Daintree and Wet Tropics rainforests region of north-eastern Queensland.