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Serenoa repens, commonly known as saw palmetto, is the sole species currently classified in the genusSerenoa. It is a small palm, growing to a maximum height of around 7–10 ft (2–3 m). It is endemic to the lowlands and savanna scrubs of the subtropical southeastern United States, most commonly along the south Atlantic and Gulf Coastal plains, but also as inland to southern Arkansas.

Its trunk is sprawling, and it grows in clumps or dense thickets in sandy coastal lands or as undergrowth in pine woods or hardwood hammocks. Erect stems or trunks are rarely produced but are found in some populations. It is a hardy plant; extremely slow growing, and long lived, with some plants, especially in Florida possibly being as old as 500–700 years.

Saw palmetto is a fan palm, with the leaves that have a bare petiole terminating in a rounded fan of about 20 leaflets. The petiole is armed with fine, sharp teeth or spines that give the species its common name. The teeth or spines are easily capable of breaking the skin, and protection should be worn when working around a Saw Palmetto. The leaves are light green inland, and silvery-white in coastal regions. The leaves are 1–2 m in length, the leaflets 50–100 cm long. They are similar to the leaves of the palmettos of genus Sabal. The flowers are yellowish-white, about 5 mm across, produced in dense compound panicles up to 60 cm long. The fruit is a large reddish-black drupe and is an important food source for wildlife and historically for humans. The plant is used as a food plant by the larvae of some Lepidoptera species such as Batrachedra decoctor, which feeds exclusively on the plant. This plant is also edible to human beings, but the greener it is the more bitter tasting it would be.

The generic name honors American botanist Sereno Watson.