The Blue Jacaranda , Jacaranda mimosifolia more often known simply as the "Jacaranda", is a sub-tropical tree native to South America that has been widely planted elsewhere because of its beautiful and long-lasting blue flowers. Older sources give it the systematic name Jacaranda acutifolia , but it is nowadays more usually classified as Jacaranda mimosifolia . It is also known as the Black Poui , or as the fern tree. In scientific usage, the name "Jacaranda" refers to the genus Jacaranda , which has many other members, but in horticultural and everyday usage, it nearly always means the Blue Jacaranda.