Task: Explanation
Input (English): Pachycereus is a genus of 9–12 species of large cacti native to Mexico and just into southern Arizona, United States. They form large shrubs or small trees up to 15 m or more tall, with stout stems up to 1 m in diameter. Question: Is the plant Decumaria a genus of more species than the plant Pachycereus? Answer: no
Output (English): Pachycereus is a genus of 9–12 species of large cacti native to Mexico and just into southern Arizona, United States.