Morus, a genus of flowering plants in the family Moraceae, comprises 10-16 species of deciduous trees commonly known as mulberries, growing wild and under cultivation in many temperate world regions. The closely related genus Broussonetia is also commonly known as mulberry, notably the paper mulberry, Broussonetia papyrifera. Mulberries are fast-growing when young, but soon become slow-growing and rarely exceed 10-15 m (30-50 ft) tall. The leaves are alternately arranged, simple and often lobed and serrated on the margin. Lobes are more common on juvenile shoots than on mature trees.