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The Mexican yam (Dioscorea mexicana) belongs to Dioscoreaceae (the Yam family). It is a perennial herb that is distributed from Mexico to El Salvador and Panama in Central America. It grows in tropical biomes with dry seasons and can reach a height of around 6 m. The tuber is dome-shaped, with a diameter of around 90 cm and a height of around 30 cm, and is partially or completely above ground. The tuber is also covered in protrusions that resemble elephant feet or tortoise shells. In late spring, it sends out surprisingly vigorous vines from the tip of the rhizome, which continue to grow until they die in winter. The leaves are cordate. In summer, it produces inconspicuous, small purple flowers. The tubers are used in folk medicine and as food.
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