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Dioscorea floridana, the Florida yam, is a plant species native to Florida, Alabama, Georgia and South Carolina. It grows in wet and sandy places at low elevations. [3] [4] Dioscorea floridana is a perennial vine twining over other vegetation and spreading by means of yellow underground rhizomes. Stems can reach a height of over 4 m off the ground.
It is commonly known as wild yam, colic root, rheumatism root, devil's bones, and fourleaf yam. [4] It is common and widespread in a range stretching from Texas and Florida north to Minnesota, Ontario and Massachusetts. [3] [5] [6] [7] [8]
Dioscorea bulbifera (commonly known as the air potato, air yam, bitter yam, cheeky yam, potato yam, [2] aerial yam, [3] and parsnip yam [4]) is a species of true yam in the yam family, Dioscoreaceae. It is native to Africa, Asia and northern Australia. [ 1 ]
Yam is an important dietary element for Nigerian and West African people. It contributes more than 200 calories per person per day for more than 150 million people in West Africa, and is an important source of income. Yam is an attractive crop in poor farms with limited resources. It is rich in starch, and can be prepared in many ways.
During the 1950s scientists found that the roots of wild yams contained diosgenin which is a plant-based estrogen; diosgenin is hypothesized to aid in chemical defense against herbivores. This was used to create the first birth control pills during the 60s. [9] In addition, some Dioscorea species are rich in nutrients and antioxidants.
New plants sprout from the bulbils or parts of them. The flowers of Chinese yam are cinnamon-scented. The plant produces one or more spindle-shaped [5] or cylindrical [11] tubers. The largest may weigh 10 pounds (4.5 kg) and grow one meter (3 ft 3 in) underground. [11]