The Citrus Family Tree http://www.nationalgeographic.com/magazine/2017/02/explore-food-citrus-genetics/?utm_source=Facebook&utm_medium=Social&utm_content=link_fb20170114ngm-citrus&utm_campaign=Content&sf50878872=1 有趣的柑橘類祖譜。黑線表母系,灰線表花粉親,虛線表突變。 All the oranges, lemons, limes, and grapefruits you’ve ever eaten are descendants from just a few ancient species. Citrus, in many ways, stands alone. So many cultivated species have come from so few primary ancestors. Just three, in fact: citrons, pomelos, and mandarins, all native to South and East Asia before they