桃金娘（学名：Rhodomyrtus tomentosa），是桃金娘科桃金娘属的植物，又名岗稔、山稔、稔子、当梨、山乳、岗菍等。在潮汕地区，则是被叫做乌多尼。

桃金娘为常绿灌木，高1米左右；椭圆形叶子对生，有基出三大脉，下面被毛；花单生叶腋，花期为七月至八月；果实为浆果，未成熟时为绿色，八月至十月间成熟，成熟时为暗紫色，樱桃般大小，果肉红色，味甘，可食用。

Rhodomyrtus tomentosa also known as rose myrtle, is a flowering plant in the family Myrtaceae, native to southern and southeastern Asia, from India, east to southern China, Hong Kong, ****** and the Philippines, and south to Malaysia and Sulawesi. It grows in coasts, natural forest, riparian zones, wetlands, moist and wet forests, bog margins, from sea level up to 2400 m elevation.