Japanese name: アサザ Scientific name:Nymphoides peltata
[Overview]
An aquatic perennial that grows in shallow ponds and marshes, often forming colonies.
It has long rhizomes extending sideways.
The leaves are simple and alternate, floating on the water surface, ovate to rounded, 5–10 cm across, with shallow wavy teeth on the margin and a deeply notched base.
The underside of the leaf is tinged with purplish brown and covered all over with brown dots.
The petiole is long, attached somewhat peltately, and sheath-like at the base.
The flowers are borne at the base of the petiole, yellow, 3–4 cm across.
The corolla is 5-lobed, with long hairs on the margin.
The flower stalk is 3–12 cm long.
Each flower withers in a single day.
The fruit is a long ovoid capsule.
The seeds are flat and obovate with columnar projections on the margin, and winged.
[Cultivation]
Propagate by division.
It prefers a sunny location.
