Good morning Sir. I copy here the following entries from the book "Plant Groups" (by H. Mukherji; pub. New Central Book Agency Pvt. Ltd.; 2005), vide page no. 1106 -
*Polygonum barbatum* L. B. (Bengali name) BEKHUNJUBAZ *Polygonum hydropiper* L. E. Water pepper; B. PAKURMUL *Polygonum orientale* L. E. Oriental pepper; B. PANI-MARICH (the genus *Persicaria* is referred as *Polygonum* in the same book) However, since the English name of *Persicaria hydropiper* is 'water pepper' it would be more apt to call it PANI-MARICH as you have suggested here. Thank you once again. Regards, Surajit
