Nuphar polysepalum
This species occurs in ponds and lakes throught the Alaska lowlands.
This plant utilizes anaerobic respiration which is respiration without oxygen.
This process allows the plant to oxygen-poor environments found in standing water.
The anaerobic respiration produces alcohol (ethanol) and the plant evaporates in through balloon-like stuctures (aerenchyma cells) to the surface of the water.
In Alaska, this plant has a mean growing season of 10 degrees celsius.