Dear Uli, I can't find a listing for Oxalis aquatica in my Oxalis checklist either. When doing some searching I came up with these possible candidates for aquatica species that might fit as a topic of discussion for this group. Alpinia aquatica Commelina aquatica Cyanella aquatica Hypoxis aquatica Ipomoea aquatica Nymphoides aquatica Romulea aquatica Spiloxene aquatica Does anyone grow any of these or have you seen any of these in the wild? Mary Sue >An IPNI search on Oxalis aquatica comes up blank.