Ceibo Tree And Red Quebracho Tree is The National Tree of Argentina. The Erythrina is a South American tree, with carmine red flowers and a crooked trunk. Locally Erythrina is called as ceibo, Sebo or bucar. The name Erythrina means coral tree from the Greek word for red, in allusion to the color of the flowers. Although this tree grows best close to a river or a lake, it is very popular in cities because of its red beauty in spring.