Charpentiera australis is a species of flowering plant in the family Amaranthaceae. It is a tree or shrub native to Rarotonga in the Cook Islands, and to Raivavae and Tubuai in the Tubuai Islands of French Polynesia.[1]
It grows in lowland rain forests from 100 to 370 meters elevation. The range and population of the species is very limited. The species' population is estimated at 50 mature individuals on the three islands, with an area of occupancy (AOO) is 8 km2 on Raivavae. There are fewer than 10 subpopulations on the three islands, with only one known on Rarotonga. The population of the species is likely declining, and threats include habitat loss from forest clearance and fires, competition from invasive species, and predation from introduced pests.