Callitriche japonica
- kingdom: Plantae
- phylum: Tracheophyta
- class: Magnoliopsida
- order: Lamiales
- family: Plantaginaceae
- genus: Callitriche
- species: Callitriche japonica
Iwakuni
Yamaguchi
Japan
Bergschenhoek- Berkel en Rodenrijs
South Holland
Netherlands