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Science & Nature • Vegetable

Purple yam

Purple yam is the common name for *Dioscorea alata*, a species of yam grown for its starchy edible tubers.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 27, 2026|2 min read| Fact-checked

Purple yam, also known as ube, is the common name for *Dioscorea alata*, a species of yam grown for its starchy edible tubers. The tubers are often violet-purple but can also be white, and it is used in both savoury dishes and desserts, especially in Philippine cuisine. In Canada, purple yam appears in groceries and restaurant menus as ube, particularly in desserts and baked goods.

Taxonomy and naming

Purple yam is the common culinary name for *Dioscorea alata*, a species in the yam family Dioscoreaceae. It has many regional names, including ube, water yam, winged yam, and greater yam.

Description

The plant is a perennial climbing vine that produces edible tubers. The tubers are usually purple or lavender, but colour can vary from cream to white depending on the cultivar.

Uses in food

Purple yam is a starchy food crop used as a carbohydrate source. It is eaten boiled or baked and is also used in desserts, particularly in Filipino cuisine, where it is often turned into ube halayá and halo-halo.

Cultivation and distribution

The species is believed to have originated in Southeast Asia and is now grown widely across tropical and subtropical regions. Sources describe it as one of the most widely distributed cultivated yams.

Key facts

  • The term purple yam usually refers to *Dioscorea alata*, a yam species native to Southeast Asia.
  • Its tubers are commonly violet-purple to lavender, though some varieties have white flesh or skin.
  • It is also widely known as ube, especially in the Philippines.
  • The plant is a climbing vine with tuberous underground storage organs.
  • Purple yam is used in a range of foods, including boiled dishes, baked preparations, and desserts such as ube halayá and halo-halo.
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Canadian context

Purple yam appears in Canadian groceries, Asian specialty markets, and restaurant menus as ube, especially in desserts and baked goods.

Frequently asked questions

What is purple yam?
Purple yam is the common name for *Dioscorea alata*, a species of yam grown for its edible tubers.
Is purple yam the same as ube?
Yes. Ube is one of the most common names for purple yam, especially in Philippine cuisine.
What colour is purple yam flesh?
It is often violet-purple to lavender, but some varieties have white or cream-coloured flesh or tubers.
What is purple yam used for?
It is used as a starchy vegetable and in desserts such as ube halayá and halo-halo.
Where does purple yam come from?
It is native to Southeast Asia and is now cultivated in other tropical regions.
What type of plant is purple yam?
It is a perennial climbing vine with tuberous underground storage organs.

References

  1. Wikipedia — https://en.wikipedia.org/wiki/Dioscorea_alata
    Supports: Scientific name, common names, tuber colour variation, and identification as the species commonly called purple yam.
  2. Botanical Online — https://www.botanical-online.com/en/food/yam-dioscorea-alata
    Supports: Common names, edible uses, and description as a food crop.
  3. ScienceDirect — https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/dioscorea-alata
    Supports: Origin in Southeast Asia, global cultivation, and plant description.
  4. Flowers of India — https://www.flowersofindia.net/catalog/slides/Purple%20Yam.html
    Supports: Culinary uses, regional names, and common use in Philippine desserts.
  5. Journal of Neonatal Surgery — https://www.jneonatalsurg.com/index.php/jns/article/download/2989/3298/15681
    Supports: General botanical description and cultivation across tropical and subtropical regions.