polygonum
/ (pəˈlɪɡənəm) /
noun
any polygonaceous plant of the genus Polygonum, having stems with knotlike joints and spikes of small white, green, or pink flowers
See also knotgrass, bistort, prince's feather (def. 2)
Word Origin for polygonum
C18: New Latin, from Greek
polugonon knotgrass, from
polu-
poly- +
-gonon, from
gonu knee