Palms are long-lived, wood monocotyledons that are solitary or clumping in growth habit, bear a distinctive crown of leaves, produce unisexual or bisexual flowers on the same or separate plants, and reproduce by seeds. The palms are ancient land plants, with fossils dating as the late Cretaceous (about 85 million years) The palms are highly specious, with an estimated in 2,500-3,500 species in 210-236 genera.