jointweed means any member of the genus Polygonella, now included in genus Polygonum of knotweeds and smartweeds, especially Polygonella articulata, now Polygonum articulatum.
Etymology
From joint + weed.
noun
- Any member of the genus Polygonella, now included in genus Polygonum of knotweeds and smartweeds, especially Polygonella articulata, now Polygonum articulatum.