Floating-heart
noun
1.
any of certain aquatic plants belonging to the genus Nymphoides, of the gentian family, especially N. aquatica, having floating, more or less heart-shaped leaves and a cluster of small, white, five-petaled flowers.
2.
a related plant, Nymphoides cordata, of North America, having a cluster of white flowers and round or somewhat oval leaves that are purple beneath.
noun
1.
any perennial aquatic freshwater plant of the genus Nymphoides, esp N. lacunosum, having floating heart-shaped leaves: family Menyanthaceae
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