• Common name : Cow Lily, Yellow Pond Lily, Yellow Water Lily
• Scientific name : Nupharadvena
• Family : Nymphaeaceae
• Native land : North America
It is a perennial, herbaceous, emergent aquatic plant. The plant grows to the surface of the water from a thick horizontal root-stock. The stem is absent. The flowers grow on long peduncles and the leaves on separate petioles. The fruit is a depressed, globular, fleshy body and seeds are oblong, stipulates. The flowers open as the sun rises and close entirely during the mid-day heat and at night. Interestingly, when the flowers close in the evening, they sometimes trap beetles overnight, releasing them when they reopen the next morning. The starchy roots were eaten by Native-Americans, so were the seeds.