polygonum

noun
po·​lyg·​o·​num | \pə-ˈli-gə-nəm \

Definition of polygonum 

: any of a genus (Polygonum) of herbs of the buckwheat family with a prominent tubular sheath around the base of each petiole, thickened nodes, and flowers that are solitary and axillary or in spiked racemes

called also knotweed

First Known Use of polygonum

1562, in the meaning defined above

History and Etymology for polygonum

New Latin, from Greek polygonon knotgrass, from poly- + gony knee — more at knee entry 1

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The first known use of polygonum was in 1562

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