The royal palm is a botanical puzzle with a history of mistaken identities

Gardening · Published 3 October 2026 Swipe more like this →

In short: The Cuban royal palm is more than an ornamental icon. Beyond its striking grey-white trunk and green crownshaft, this tree hides complex biological secrets, including rare nitrogen-fixing root nodules. From its religious significance in Santería to its potential in modern medicine, the royal palm remains a fascinating, multifaceted species.

The royal palm, Roystonea regia, is a towering presence in the tropics, reaching heights of up to 34.5 metres. Its taxonomy has been a long-standing source of confusion. Originally described by William Bartram in 1791 as Palma elata, the species was later renamed multiple times as botanists struggled to classify its populations across Cuba, Florida, and Central America. While some researchers once argued that Floridian and Cuban populations were distinct species, modern consensus—led by revisions from Scott Zona—confirms they are a single species. The name Roystonea regia was eventually conserved over the older, technically valid name Roystonea elata, primarily because the former had been established in global horticultural use since at least 1838.

Beyond its aesthetic appeal, the tree exhibits remarkable biological adaptations. In India, researchers discovered root nodules on the palm containing Rhizobium bacteria. This was a significant finding, as it marked the first record of such nodules in a monocotyledonous tree, typically a trait associated with nitrogen-fixing legumes. These nodules also produce indole acetic acid, a vital plant hormone. Furthermore, the tree serves as a critical ecological hub, providing food and shelter for various bats, birds, and insects, including the royal palm bug and several butterfly species.

The utility of the royal palm extends into human industry and medicine. Its leaves are used for thatch, its wood for construction, and its seeds as a source of oil and livestock feed. In traditional medicine, its roots are used as a diuretic and for diabetes treatment. More recently, scientific interest has turned to D-004, an extract from the fruit. This mixture of fatty acids has shown promise in reducing benign prostate hyperplasia in rodent studies, positioning it as a potential alternative to conventional treatments like finasteride. Whether in the sacred rituals of Santería or the laboratory, the royal palm continues to prove its enduring value.

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