Coefficient of Conservatism:
Coefficient of Wetness:
G. E. Crow
This is a showy species native to temperate Eurasia with yellow flowers. As the name indicates, the cordate floating leaf blade suggests that of a small Nymphaea. Sometimes planted in water gardens, it spreads aggressively and is potentially invasive. It was collected in 2015 from shallow water in a man-made pond in Wayne County by A. de Palma-Dow and B. Luukkonen, and is included somewhat tentatively as the origin of the population is unclear; perhaps having been planted.
Nymphoides cordata (Elliott) Fernald, Floating-heart, is a small native species that might be expected in soft waters of the Upper Peninsula, as it grows as near as Sudbury and elsewhere in the northern Lake Huron region of Ontario. The elongate stem (resembling a petiole) bears pedicels with small white emergent flowers and usually a cluster of tuberous adventitious roots.