Vegetative key to the families

PALMS. Leaves large, pinnately or palmately divided, the segments with parallel venation; leaf bases enclosing or clasping the stem. Young inflorescences enclosed by a large deciduous spathe Arecaceae
Leaves pinnately divided
Leaf petiole without sheathing base; lower pinnae spine-like Phoenix
Leaf petiole with sheathing base; lower pinnae not spine-like Archontophoenix