Nymphoides hydrophylla, commonly known as crested floating-heart, is an aquatic plant of the family Menyanthaceae native to Taiwan. It has cordate floating leaves that support a lax inflorescence of dainty white flowers with fringed petal margins. Its slim stem (spear) is edible, and is used as vegetable in Taiwan, mostly produced at Meinong District, Kaohsiung.
Flowers of N. hydrophylla are gynodioecious. The fruit is a capsule bearing many flattened seeds.