'Palm trees' in the Bible

Now, the sons of the Kenite, father-in-law of Moses, had come up from the city of palm-trees, with the sons of Judah, into the wilderness of Judah, which is in the south of Arad, - so they went and dwelt with the people.

and he gathered unto him, the sons of Ammon, and Amalek, - and came and smote Israel, and took possession of the city of palm-trees.