Photos of European Plants:
Polygonaceae / Knotweed Family (Buckwheat Family)

This Family acc. to Relationship
  Genus with more than one available species, can be opened by mouse click
  Genus with more than one available species has been opened

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Aconogonon / Knotweed (2 Taxa) D F
Bistorta / Bistort (2 Taxa) A And D E F SLO
Emex spinosa / Spiny Emex, Lesser Jack D
Fagopyrum / Buckwheat (2 Taxa) D
Fallopia / Bindweed (6 Taxa + 2 Syn.) D F
Oxyria digyna / Alpine Mountain Sorrel A S
Persicaria / Water-Pepper (12 Taxa + 1 Syn.) A D E F IRL Les NL S
Polygonum / Knotgrass (5 Taxa + 18 Syn.) A And Cor D E F GR HR IRL Les NL S SLO
Reynoutria / Bindweed (4 Syn.) D F
Rheum rhabarbarum / Rhubarb D S
Rumex / Dock, Sorrel (31 Taxa + 9 Syn.) A CH Chi Cor D DK E F GR Gom HR I Kre Les Mal NL Rho S SLO Sam Ten

This Family acc. to Relationship
For combined criteria out of Family, Flower Anatomy, Color, and Leaf Form see here.

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