Ptychosperma and Carissa are both native to where?
Ptychosperma: Ptychosperma is a genus of flowering plant in the Arecaceae family. Ptychosperma:  Most are native to Australia and/or New Guinea, with a few in the Solomon Islands and in Maluku Province of eastern Indonesia. Carissa: Carissa is a genus of shrubs or small trees native to tropical and subtropical regions of Africa, Australia and Asia.
Australia