Notes For Reference:-

Species, Varieties, or Forms in the Genus Nymphoides:

Nymphoides coreana / Himeshiroasaza
Nymphoides indica / Gagabuta
Nymphoides peltata / Asaza
　

Nymphoides peltata / Asaza アサザ

Nymphoides peltata is an aquatic perennial herb that inhabits ponds and marshes, characterized by rhizomes that extend long into the mud at the bottom and bear thick, long stems. Leaves, with long petioles, float on the water surface, are 5-10cm in diameter, ovate- or orbicular-shaped, the bases deep-heart-shaped, and the margins have shallow, wavy serrations around. The leaf's underside has brown-purple tinges. Axils produce flower stalks that produce yellow flowers that float on the water's surface. The 3-4cm in diameter corollas are deeply cleaved into five segments; their tips have one dent each, and the margins are cleft in a thread-like manner. Stamens are 5 in number, and pistils are 1. Bloom time: June-August.