Dioscorea mexicana

Scheidw.

Dioscoreaceae Edible: Tubers, Shoots 277 iNaturalist observations

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Summary

Dioscorea mexicana, Mexican yam or cabeza de negro is a species of yam in the genus Dioscorea. 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. The caudex of D. mexicana is divided into regular polygonal plates that become protuberant with age, and separated by deep fissures. The vigorous annual vines which may reach 30 feet (9 m) long before dying back in winter, that grow up from the caudex, bear heart-shaped leaves. Dioscorea mexicana ranges from the state of San Luis Potosí in northeastern Mexico south to Panama. It is notable for its production of diosgenin, which is a precursor for the synthesis of hormones such as progesterone. Russell Marker developed the extraction and manufacture of hormones from D. mexicana at Syntex. Later the Mexican barbasco trade focused instead on Dioscorea composita instead, as this variety has a higher diosgenin content.

Description

A tropical yam vine in the Dioscoreaceae family.

This description is brief — help expand it

Edible Uses

The tubers and shoots are eaten cooked.

Traditional Uses

The tubers and shoots are eaten cooked.

This uses section is brief — help expand it

Distribution

It is a tropical plant.

Where It Grows

Mexico,

Synonyms

Dioscorea macrostachya Benth.and others

Also Known As

Camote amarillo, Cuculmeca, Panil book

References (2)

Kermath, B. M., et al, 2014, Food Plants in the Americas: A survey of the domesticated, cultivated and wild plants used for Human food in North, Central and South America and the Caribbean. On line draft. p 309 (As Dioscorea macrostachya)
Lim, T. K., 2015, Edible Medicinal and Non Medicinal Plants. Volume 9, Modified Stems, Roots, Bulbs. Springer p 36