Kentucky coffee tree
Gymnocladus dioica
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Botanical Description
Gymnocladus dioica, the Kentucky coffee tree, is a medium to large deciduous tree of the Fabaceae family, typically reaching 18-30 m tall with a trunk diameter of 60-90 cm. The bark is gray to grayish-brown, deeply fissured with scaly ridges. Its bipinnately compound leaves are among the largest of any North American tree, up to 90 cm long, with ovate leaflets 4-7 cm long that emerge late in spring and turn yellow in autumn. The species is dioecious, bearing greenish-white flowers in terminal panicles; female panicles are longer (up to 30 cm). Fruits are thick, leathery, reddish-brown pods 12-25 cm long containing several large, hard, dark brown seeds embedded in sticky pulp. Native to the central and eastern United States and adjacent Canada, the tree grows in rich bottomland forests and well-drained uplands. All raw plant parts contain the toxic alkaloid cytisine.
Cultural & Historical Context
Traditional American Uses
Several Native American groups, including the Meskwaki, Pawnee, and Omaha, ceremonially used Gymnocladus dioica seeds as gaming dice and rattles, with the roasted seeds occasionally consumed as a coffee substitute after thorough heating to destroy cytisine (Gilmore, 1919). The Meskwaki are reported to have used a powdered root bark preparation as a snuff to induce sneezing in cases of headache and as a remedy for nasal congestion (Smith, 1928). Pawnee and Omaha used pulverized root bark in compound medicines (Gilmore, 1919). Raw seeds, leaves, and pods are toxic due to cytisine and were never used internally without prolonged roasting.
Chemistry & External Identifiers
Important Disclaimer
This information is for educational purposes only and is not intended to replace professional medical advice. Always consult a qualified healthcare provider before using any herbal remedy, especially if you are pregnant, nursing, or taking medications.