The big yam is back

 作者:胶媸     |      日期:2019-03-07 04:14:06
A RARE variety of the world’s largest vegetable has been rediscovered in the wild after 40 years. Scientists feared that the elephant’s foot—a variety of wild yam—had become extinct in its only habitat, the Northern Cape plateau of South Africa. Called elephant’s foot because of its huge edible tuber that can weigh up to 300 kilograms, the yam was over-collected by botanists and plant traders. But the sub-species of Dioscorea elephantipes was spotted by botanists from the Millennium Seed Bank in Sussex during a seed-collecting expedition to the plateau in February. Embarrassingly,