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Tonka bean

Tonka bean is the seed of the tropical tree *Dipteryx odorata* in the pea family, Fabaceae.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

Tonka bean is the seed of the tropical tree *Dipteryx odorata* in the pea family, Fabaceae. The seeds are known for their strong, sweet fragrance, which comes mainly from coumarin. The tree is native to northern South America and parts of Central America, and the seeds are used in perfumery and, in some places, as a flavouring.

Botanical identity

Tonka bean is the common name for the seed of *Dipteryx odorata*, a flowering tree in the Fabaceae family. Sources also note related common names such as cumaru and Brazilian teak.

Description

The seeds are typically black and wrinkled outside, with a smooth brown interior. The tree is a tropical species native to northern South America and Central America.

Chemistry and aroma

Tonka beans are valued for their sweet, vanilla-like aroma, which is linked to their high coumarin content. Coumarin is the compound most often cited as responsible for the bean’s characteristic scent.

Uses

Tonka beans have been used in perfumery, soaps, tobacco scenting, and some culinary traditions. Several sources also note that regulations or safety concerns limit food use in some countries because of coumarin.

Key facts

  • Tonka bean refers to the seed of *Dipteryx odorata*, not a true bean.
  • The seed is black and wrinkled externally with a brown interior.
  • Its scent is associated with high coumarin content.
  • Tonka beans are used mainly in perfumery, and occasionally in food where permitted.
  • The tree is native to tropical areas of Central and South America.
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Canadian context

Tonka bean is relevant to Canadian readers mainly through cooking, perfumery, and plant trade; however, the sources provided do not identify a distinct Canada-specific cultivation or historical role.

Frequently asked questions

What is a tonka bean?
A tonka bean is the seed of *Dipteryx odorata*, a tropical tree in the pea family.
Where does tonka bean come from?
The tree is native to Central America and northern South America, including the Amazon region.
Why does tonka bean smell so strong?
Its strong sweet aroma comes mainly from coumarin, a naturally occurring chemical in the seed.
Is tonka bean a real bean?
No. It is the seed of a tree in the Fabaceae family, but it is commonly called a bean because of its shape and use.
What are tonka beans used for?
They are used in perfumery, fragrance products, and in some places as a flavouring ingredient where regulations allow it.

References

  1. Wikipedia — https://en.wikipedia.org/wiki/Dipteryx_odorata
    Supports: Scientific identity of tonka bean as the seed of *Dipteryx odorata*; native range; alternative common names.
  2. Plants For A Future — https://www.pfaf.org/user/Plant.aspx?LatinName=Dipteryx%20odorata
    Supports: Common names, native range, and botanical classification.
  3. JSTOR Daily — https://daily.jstor.org/tonka-bean-the-tale-of-a-contested-commodity/
    Supports: Aroma, coumarin, seed description, native range, and uses.
  4. Salvia Paradise — https://www.salviaparadise.com/plants-herbarium/tonka-bean-tree/c-1212.html
    Supports: Tree description, native range, coumarin content, and uses in scenting and flavouring.
  5. Dominica Botanic Gardens — https://www.dominicagardens.com/dipterix-odorata.html
    Supports: Tree description, tonka bean seed use, coumarin, and traditional uses.