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Yam is the common name for some plant species in the genus Dioscorea (family Dioscoreaceae) that form edible tubers (some other species in the genus being toxic). Yams are perennial herbaceous vines native to Africa, Asia, and the Americas and cultivated for the consumption of their starchy tubers in many temperate and tropical regions.
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 ]
Dioscorea dumetorum, also known as the bitter yam, cluster yam, trifoliate yam, or three-leaved yam, [1] is a species of flowering plant in the yam family, Dioscorea. It is native to sub-Saharan Africa and especially common in the tropical regions of West Africa, including Nigeria, Benin, and Ghana. [2] D. dumetorum has both toxic and non-toxic ...
The flowers, buds, and leaves of the sweet potato, which resemble those of the morning glory Seeds. The plant is a herbaceous perennial vine, bearing alternate triangle-shaped or palmately lobed leaves and medium-sized sympetalous flowers.
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.
Dioscorea polystachya, Chinese yam. Dioscorea polystachya vines typically grow 3–5 meters (9.8–16.4 ft) long, and can be longer. They twine clockwise. The leaves are up to 11 centimeters (4.3 in) long and wide.
Dioscorea pentaphylla is a species of flowering plant in the yam family known by the common name fiveleaf yam. It is native to southern and eastern Asia ( China , India , Indochina , Indonesia , Philippines , etc.) as well as New Guinea , Sri Lanka and northern Australia .
The African cassava mosaic virus causes the leaves of the cassava plant to wither, limiting the growth of the root. [37] An outbreak of the virus in Africa in the 1920s led to a major famine. [ 38 ] The virus is spread by the whitefly and by the transplanting of diseased plants into new fields.