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"Yams generally have a rough, scaly, and brown-colored skin with white to purple flesh," Harvey said. "They are often long and cylindrical shaped and can have off-shoots called 'toes.'
Even though these growers called their products yams, true yams are significantly different. All sweet potatoes are variations of one species: I. batatas. Yams are any of various tropical species of the genus Dioscorea. A yam tuber is starchier, dryer, and often larger than the storage root of a sweet potato, and the skin is more coarse. [3]
Sweet potatoes can also be called yams in North America. When soft varieties were first grown commercially there, there was a need to differentiate between the two. Enslaved Africans had already been calling the 'soft' sweet potatoes 'yams' because they resembled the unrelated yams in Africa. [ 8 ]
The seed yams are perishable and bulky to transport. Farmers who do not buy new seed yams usually set aside up to 30% of their harvest for planting the next year. Yam crops face pressure from a range of insect pests and fungal and viral diseases, as well as nematodes. Their growth and dormant phases correspond respectively to the wet season and ...
Yams can also grow much larger than sweet potatoes, too—more than five feet long and up to 100 pounds. Like sweet potatoes, though, they're best stored in cool, dark spots.
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Dioscorea alata – also called ube (/ ˈ uː b ɛ,-b eɪ /), ubi, purple yam, or greater yam, among many other names – is a species of yam (a tuber). The tubers are usually a vivid violet - purple to bright lavender in color (hence the common name), but some range in color from cream to plain white.
The particular yam species best for preparing àmàlà is Dioscorea cayenensis (Ikoro) because of its high starch content. [13] Because of its perishability, yam is often dried and made into flour. The flour can then be reconstituted with hot water to form a paste or gel called kokonte in Ghana and Togo, and àmàlà in Nigeria.
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