1) Genus serenoa 2) Liliopsid genus 3) Monocot genus 
Serenoa repens, commonly known as saw palmetto, is the sole species currently classified in the genus Serenoa. It has been known by a number of synonyms, including Sabal serrulatum, under which name it still often appears in alternative medicine. It is a small palm, growing to a maximum height of around 7–10 ft (2–3 m). Its trunk is sprawling,...
(from the article `palm`) ...modern families of flowering plants. By the beginning of the Eocene Epoch, nearly 60 million years ago, palms were widespread and abundant. A ...
[n] - one species: saw palmetto
genus Serenoa noun one species: saw palmetto