- Any person in the genus Polygonella of knotweeds and smartweeds.
- A slender, almost leafless, US natural herb (Polygonum articulatum), with jointed spikes of tiny blossoms.
- Polygonum articulatum, an American plant: so-called from the many-jointed spike-like racemes.
- A. title of a species of Equisetum.
- The mare's tail, Hippuris vulgaris.
- Definition for "jointweed"
- Any person in the genus Polygonella of knotweeds…
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- Synonym for "jointweed"