''Polygonum bellardii'', the narrowleaf knotweed, is a species of annual herb in the family

Polygonaceae The Polygonaceae are a family of flowering plants known informally as the knotweed family or smartweed—buckwheat family in the United States. The name is based on the genus ''Polygonum'', and was first used by Antoine Laurent de Jussieu in 1789 ...

. They have a self-supporting growth form and simple, broad leaves. They are native to Southern Europe, West Asia and North Africa. Individuals can grow to 0.49 m.

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{{Taxonbar, from=Q15597738 bellardii Flora of Europe Flora of Western Asia Flora of North Africa