Chung replied that the epiphyllum was a genus in the cactus family, and the moth was its major pollination agent.Therefore, epiphyllum was white to facilitate moths to identify it at night.

• 报告人答昙花这种仙人掌类的植物，授粉主要的传播媒介为蛾类，是故昙花为白色以便蛾类在夜间辨识。