TEMPORAL SEPARATIONS. “Alternatively, male and female function can be separated in time within an individual, as found in many plants (“dichogamy,”) and some animals (“sequential hermaphroditism,”); slipper shells, for example, are born male and become female later in life. Finally, male and female reproductive organs can be segregated into different individuals, as in some plants (such as papaya and cannabis) and most animals.”
http://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.1001899