The ancient fan-palms of the Americas have a history stretching back millions of years

Gardening · Published 3 October 2026 Swipe more like this →

In short: Sabal palms are iconic New World plants, recognizable by their unique fan-shaped leaves and central midribs. While these hardy palms are now staples of subtropical landscapes, their evolutionary story is a shifting puzzle, with modern genetic studies challenging long-held assumptions about how these diverse species are truly related to one another.

The genus Sabal comprises 17 recognized species, including one hybrid, native to regions spanning from the southeastern United States down to Colombia and Venezuela. These palms are defined by their distinct leaves, which emerge from an unarmed petiole in a fan-like arrangement. A defining feature is the costa, a midrib that extends into the leaf blade; the length of this midrib dictates whether the leaf appears strongly curved, as in the Sabal palmetto, or relatively flat, as seen in the Sabal minor.

Understanding the evolutionary history of Sabal has evolved significantly since Michel Adanson first named the group in the 18th century. In 1990, Scott Zona proposed a classification system based on morphological traits, organizing 15 species into four distinct clades that largely aligned with geographic distribution. However, a 2016 molecular study by Heyduk et al. disrupted this model. By analyzing nuclear and plastid data, the researchers found that Zona’s fourth clade was split across the phylogeny, and his third clade was significantly reorganized. While some relationships, such as the sister-species pairing of Sabal causiarum and Sabal domingensis, remained consistent, the molecular evidence revealed a more complex evolutionary picture.

Beyond their modern distribution, Sabal has a deep fossil record dating from the late Cretaceous to the Quaternary period, roughly 66 million to 12 thousand years ago. Fossil evidence shows that these palms once thrived far beyond the Americas, with remains discovered across Europe, including sites in Italy, Switzerland, and Greece, as well as in Japan. Today, these resilient plants serve as vital food sources for diverse wildlife, from birds like the northern mockingbird to mammals like the American black bear. Humans have also long utilized them; the central bud of the Sabal palmetto is edible as 'swamp cabbage,' and the fronds are historically valued for thatching and weaving.

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