Vodeni dvornik
Polygonum amphibium
Kopljasti listovi duljine do 120 mm, na bazi zaobljeni do srcoliki, s kratkom peteljkom. Cvjetovi su ružičasti u gustim, cilindričnim klasastim metlicama klasovima. Sjemenke su oštrih bridova, duguljaste, sjajne smeđecrne. Razmnožavanje preko sjemena je moguće, ali se ipak gotovo isključivo odvija preko puzajućih rizoma. Proizvodnja sjemena je vrlo mala.
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