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Persicaria (weeds) Mill. - (smartweeds)
This genus of flowering plants is widely distributed and contains more than 50 species of herbs. Some might have woody stems. Important agricultural weeds are, for example, Pennsylvania smartweed (Persicaria pensylvanica), spotted ladysthumb (Persicaria maculosa) or curlytop knotweed (Persicaria lapathifolia).
The leaves are alternately arranged and often elongate. The inflorescence usually consist of many flowers which are white, greenish, reddish, or purple. The fruits are small nutlets, brown or black and sometimes with 3 angles. The genus is closely related to Polygonum and is sometimes regarded as a synonym of that genus.
Type species: Persicaria maculosa
Currently, the following weedy species have been entered into the system: