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Arecaceae family

Roystonea regia
(Kunth) O.F. Cook,
Science, n. s., 12: 479. 1900.
Bas.: Oreodoxa regia Kunth (1816).

Palmis. Royal palm.
Naturalized quite rare tree of flat swampy areas, and river valleys at lower elevations.
Native to Florida, Mesoamerica and the northern West Indian.
I have only seen this species in secondary formations. It is, I believe, a cultivated ornamental that has a tendency to escape and naturalize.
See also Roystonea oleracea
In Roystonea regia the leaves hang well below the horizontal.