Citrus was first cultivated by humans at least four thousand years ago in Southeast Asia, and all cultivated species derive from a handful of wild ancestors. Several years ago I found the earliest archaeobotanical evidence of citrus within the Mediterranean in a royal Persian garden near Jerusalem dating to the fifth and fourth centuries BCE. In the course of research I traced the spread and diversification of citrus through a variety of historical information, including ancient texts, art, and artifacts such as wall paintings and coins, and by gathering all the available archaeobotanical remains: fossil pollen grains, charcoal, seeds, and other fruit remains.Background here and links.
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