Wikijunior:Summer Flowers of Northern New England/Nymphoides cordata

Description:
Floating heart is plant you can find in ponds. Take a close look at the leaves in the picture above. Can you guess why this plant is called "Floating Heart?" That's right! The leaves are heart-shaped, and they float on the surface of the water. The flowers are small with five white petals. When the flowers get old, they start to fade and become almost see-through.

Quick Facts:
The Miccosukee, a tribe of Native Americans from Florida, used Floating Heart to treat shortness of breath, trembling, and coughing – an illness they called "turtle sickness."