Houttuynia cordata.

Botanical name: 

Houttuynia cordata Thunb. Piperaceae (Saururaceae).

Himalayan region, China and Japan. The leaves of this plant are said to be used as a potherb in Nepal. In France, it is an inmate of flower gardens as an aquatic.

Sturtevant's Edible Plants of the World, 1919, was edited by U. P. Hedrick.