Dipteryx odorata (commonly known as "cumaru" or "kumaru") is a species of flowering tree in the pea family, Fabaceae. That tree is native to Central America and northern South America. Its seeds are known as tonka beans (sometimes tonkin beans or tonquin beans). They are black and wrinkled and have a smooth, brown interior. They have a strong fragrance similar to sweet woodruff (Galium odoratum) due to their high content of coumarin.
The word "tonka" is taken from the Galibi (Carib) tongue spoken by natives of French Guiana; it also appears in Tupi, another language of the same region, as the name of the tree. The old genus name, Coumarouna, was formed from another Tupi name for tree, kumarú.
Biology of the tree
The tree itself grows up to 25–30 meters, with a trunk of up to one meter in diameter. The tree bark is smooth and gray, whereas the wood is red. The tree has alternate pinnate leaves with three to six leaflets, leathery, glossy and dark green, and pink flowers. Each developed fruit contains one seed. D. odorata is pollinated by insects. The worst pests are the bats because they eat the pulpy flesh of the fruit. A few known fungi may cause problems: Anthostomella abdita, Diatrype ruficarnis, Macrophoma calvuligera and Myiocopron cubense. 
The tonka seed contains coumarin, a chemical isolate from this plant, which also gave the name to it. The seeds contain about 1 to 3% of coumarin, rarely it can achieve 10%. Coumarin is responsible for the pleasant odor of the seeds and is used in the perfume industry. Coumarin is bitter to the taste, however, and, in large infused doses, it may cause hemorrhage and liver damage, as well as it can paralyze the heart. It is therefore controlled as a food additive by many governments. Like a number of other plants, the tonka bean plant probably produces coumarin as a defense chemical. Radio-carbon dating of D. odorata stumps left by a large logging operation near Manaus by Niro Higuchi, Jeffrey Chambers, and Joshua Schimel, showed that it was one of around 100 species which definitely live to over 1,000 years. Until their research, it had been assumed unlikely that any Amazonian tree could live to old age due to the conditions of the rain forest.
Tonka beans had been used as a vanilla substitute, as a perfume, and in tobacco before being banned in some countries. They are used in some French cuisine (particularly, in desserts and stews) and in perfumes.
Its use in food industry is regulated/restricted in the United States by the Food and Drug Administration. Many anticoagulant prescription drugs, such as warfarin, are based on 4-hydroxycoumarin, a chemical derivative of coumarin initially isolated from this bean. Coumarin, however, does not have anticoagulant properties.
Cumaru, also known as Brazilian teak, is an increasingly popular hardwood used for flooring in the United States. It has a very appealing natural color variation and is considered quite durable as it has a 3540 rating on the Janka hardness scale.
Today, the main producers of tonka beans are Venezuela and Nigeria. The cumaru tree is an emergent plant, and a light-demanding calcifuge tree which grows on poor, well drained soils. The best growth is reached on fertile soils rich in humus. In the native region there is a mean annual temperature of 25°C and about 2000 mm rainfall per year with a dry season from June to November. In general, it has a very low plant density, but depending on the agricultural use, the density and the age of the trees diversify. In seed production systems, the plant density is higher and the trees are older than in timber production systems. The tree flowers from March to May, and the fruits ripen from June to July. So, the fresh fruits are picked up in June and July, and fallen pods are harvested from January to March  or sometimes earlier. The hard outer shell is removed and the beans are spread out for 2–3 days to dry, after which they can be sold. The major producer is Venezuela, followed by Brazil and Colombia. The most important importing country is the United States, where it is used especially in the tobacco industry.
This species is well known locally and generates an important income for rural families, particularly as a buffer in times of hardship. It is used for timber and nontimber products, so it is crucial that the use of this resource occurs in a sustainable way. The yield of beans per tree is about 1.0–3.5 kg per year, but cumaru trees produce a large volume of seeds every four years. This fact results in a gender dynamic. During years of low seed productivity, household income is controlled by the women. They invest in the family by buying food and basic resources such as clothing and school supplies. In years of heavy production, men control the income. During those seasons, they invest in the family by buying vehicles and tools, such as motorcycles and chainsaws.
Herbal and mythological properties
In the pagan and occult communities, the tonka bean is considered to have magical properties and uses. Some who practice magical arts believe that by crushing a tonka bean and steeping it in an herbal brew or tea, it will help cure ailments of depression, disorientation, confusion, and suicidal behavior, as well as boost the immune system.
It is also believed by some practitioners of various occult traditions that tonka beans can grant or help one fulfill desires and wishes by using the bean in a variety of methods. Such methods include holding the bean in one's hand while whispering a wish or desire, then carrying it until that wish or desire is fulfilled, then burying the bean afterwards. Another common method is by making the wish with the bean in hand, then stomping on it afterwards. Other methods include making a wish, then planting it in fertile earth, with the belief that as the plant grows, so does the wish become fulfilled.
- Dae Sik Jang, Eun Jung Park, Michael E. Hawthorne, Jose Schunke Vigo, James G. Graham, Fernando Cabieses, Bernard D. Santarsiero, Andrew D. Mesecar, Harry H. S. Fong, Rajendra G. Mehta, John M. Pezzuto, and A. Douglas Kinghorn, 2003. Potential Cancer Chemopreventive Constituents of the Seeds of Dipteryx odorata (Tonka Bean). Journal of Natural Products, Volume 66, Number 5
- CRC handbook of alternative cash crops, page 238-239
- Patricia Shanley, Murilo da Serra Silva, Tadeu Melo, Rachel Carmenta, Robert Nasi, 2012. From conflict of use to multiple use: Forest management innovations by small holders in Amazonian logging frontiers. Forest Ecology and Management 268:70-80
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- Elizabeth Gaskell, Cranford (1851)
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