From maple syrup to soap: the surprisingly diverse family of the soapberry plant

Gardening · Published 3 October 2026 Swipe more like this →

In short: The Sapindaceae family is a botanical powerhouse, encompassing nearly 2,000 species that range from common maple trees to tropical vines. While some members provide essential construction timber or sweet fruits, others contain potent chemical compounds used for everything from traditional fish-stunning to the production of industrial-grade soap.

The Sapindaceae family, or soapberry family, is a vast group of flowering plants comprising approximately 1,925 species across 145 genera. While they are predominantly found in tropical and subtropical regions, particularly within the American tropics, the family also includes temperate-zone staples. Modern botanical classification, supported by the Angiosperm Phylogeny Group, has expanded the family to include genera formerly categorized as Aceraceae and Hippocastanaceae, such as maples (Acer) and horse chestnuts (Aesculus).

Physically, the family is overwhelmingly woody, consisting of trees, large shrubs, and lianas. Their leaves are typically pinnately compound and alternately arranged, though exceptions exist. The flowers are often conspicuous, fragrant, and nectar-rich, attracting insects for pollination. Fruits are highly varied, ranging from the winged samaras of maples to the fleshy, aril-covered fruits of lychee, rambutan, and the Jamaican national fruit, ackee. Notably, ackee requires careful preparation, as it is poisonous unless harvested at the correct stage of ripeness.

The economic and cultural utility of Sapindaceae is immense. The genus Sapindus, for instance, contains saponins that create a natural lather, historically used as soap. Other species, like the Brazilian vine Paullinia cupana (guarana), are prized for their high caffeine content, which is three times that of coffee. Indigenous groups have long utilized the branches of certain lianas to stun fish in streams. Beyond these uses, the family provides valuable oils, resins like shellac, and a wide array of ornamental plants, such as the goldenrain tree and balloon vine, which are cultivated globally for their aesthetic appeal.

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