1) Genus roystonea 2) Liliopsid genus 3) Monocot genus 
Roystonea is a genus of eleven species of monoecious palms, native to the Caribbean Islands, and the adjacent coasts of Florida and Central and northern South America. Commonly known as the royal palms, the genus was named for Roy Stone, a U.S. Army engineer. It contains some of the most recognizable and commonly cultivated palms in tropical and s...
(from the article `palm`) ...that results in a forking habit. The two newly formed branches may continue equally, or one may be overtopped by the other (Nannorrhops). When ...
[n] - a monocotyledonous genus of West Indian feather palms
genus Roystonea noun a monocotyledonous genus of West Indian feather palms