According to the morphology of the neutral flowers of the abortive gynoecium and androecium, F. erecta var. beecheyana might have evolved from a monoecious ancester.

• 中性花具退化雌、雄蕊，可能源自雌雄同株演化土雌株时的退化雄花，支持雌雄异株的牛奶榕演化自雌雄同株的假说。