- The apple is the pomaceous fruit of the apple tree, species Malus domestica in the rose family Rosaceae. It is one of the most widely cultivated tree fruits. The tree is small and deciduous, reaching 5-12 m tall, with a broad, often densely twiggy crown. The leaves are alternately arranged simple ovals 5-12 cm long and 3-6 cm broad on a 2-5 cm petiole with an acute tip, serrated margin and a slightly downy underside. Flowers are produced in spring simultaneous with the budding of the leaves. The flowers are white, five petaled, 2.5-3.5 cm in diameter, white with a pink tinge that gradually fades. The fruit matures in autumn, and is typically 5-9 cm diameter (rarely up to 15 cm).