Common Name: tree-of-Heaven, tree-that-grows-in-BrooklynScientific Name: Ailanthus altissima (Mill.) SwingleFamily Name: Simaroubaceae - Quassia FamilyIdentification NotesLife Cycleintroduced perennial tree, reproducing by seed and root suckers Stemswoody, upright; bark smooth and light gray Leaves alternate, pinnately compound; leaflets oval lanceolate, 11 to 27 or more, pointed, bases square with 1-2 teeth Flowersgreenish to greenish-yellow flowers, pyramidal cluster, dioecious Fruitsamaras (winged seeds), twisted, single seeded, yellow-green become brown in winter