Oenanthe javanica, aka
water celery is the subject of an episode of "Trials to Oishii Tokyo" that I'm watching right now. They are calling it Seri and are pronouncing it as "seti". It is wonderful seeing how they grow it and how they cook with it. If I find a link to this episode I'll post it. If anyone beats me to it....thank you!!!
I've had water celery in my forest garden for more than a decade and have renewed interest in getting some into the kitchen after this show. Very excited. Seeing how it's grown in Japan has me thinking about experimenting more with growing conditions at my place too!