Task: Explanation
Input (English): Carissa is a genus of shrubs or small trees native to tropical and subtropical regions of Africa, Australia and Asia. Until recently about 100 species were listed, but most of them have been relegated to the status of synonyms or assigned to other genera, such as "Acokanthera". Question: Ptychosperma and Carissa are both native to where? Answer: Australia
Output (English): Carissa is a genus of shrubs or small trees native to tropical and subtropical regions of Africa, Australia and Asia.