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Dioscorea is a genus of over 600 species of flowering plants in the family Dioscoreaceae, native throughout the tropical and warm temperate regions of the world. The vast majority of the species are tropical, with only a few species extending into temperate climates.
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Dioscorea composita, or barbasco, is a species of yam in the family Dioscoreaceae. [ 1 ] [ 2 ] It is native to Mexico . It is notable for its role in the production of diosgenin , which is a precursor for the synthesis of hormones such as progesterone . [ 3 ]
Dioscorea mexicana, Mexican yam or cabeza de negro is a species of yam in the genus Dioscorea. [1]Dioscorea mexicana is a caudiciform dioscorea having either a partly to completely above-ground dome-shaped caudex with a thick, woody outer layer up to 3 feet (90 cm) in diameter and 8–10 inches (20 to 25 cm) in height.
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 altissima is a herbaceous vine in the genus Dioscorea that is indigenous to forested areas of Brazil, Bolivia, Peru, Central America north to Panama, and the Caribbean. Its tubers are foraged and cooked for human consumption, and they are also cultivated in Brazil on a small scale. [ 1 ]
Dioscorea trilinguis it is a species of flowering plant in the family Dioscoreaceae. [ 2 ] [ 3 ] It is a climbing tuberous geophyte that is native to southeastern Brazil ( Bahia , Rio de Janeiro , São Paulo ), and is found growing in tropical forests , dry forests, and on clay soil.
Dioscorea strydomiana is shrub-like, grows up to 1 metre (3 ft 3 in) tall with an above ground tuber that is large and rough-textured, the thick bark resembling the tortoise-shell-like bark of Dioscorea elephantipes [3] It has herbaceous stems from the upper part of the tuber each year, and then they die back over the course of the dry season.