i am pretty sure they are grass not a true tree
edit: Palm trees, of which more than 2,000 species exist, are grouped botanically with grasses, sedges, bamboo, grains, lilies, onions, and orchids. In fact, as it turns out, a palm tree has more in common genetically with turf grass or corn than it has with an oak tree! A palm tree is truly a grass giant!Jan 26, 2014