Notes For Reference:-

Species, Varieties, or Forms in the Genus Nymphae:

Nymphaea tetragona / Hitsujigusa
　

Nymphaea tetragona / Hitsujigusa ヒツジグサ

Nymphae tetragona is a perennial found in ponds or swamps; the rhizomes are thick and short. Leaves emerge in bundles with long petioles, broadly elliptical, deeply cleft in heart shape at their bases, 10-20cm long, and float on the water. The petioles bear single white flowers at the top, each approximately 5cm in diameter, which open during the daytime and close at night. The flowers are 8-15-petaled with four sepals. The round sap fruit ripens in the water as the flowers have gone. Bloom time. June-September.