Lemna valdiviana - photo taken by John Crellin at the BSBI Welsh AGM walk at Newport Wetlands on Thursday last week. We saw this rare duckweed at two places on the reserve. There has been some debate whether it is really established in Wales, this proved it. There at least two other known sites in Wales. Normally it has four leaves together in the shape of a butterfly, the above picture does not show this. As you can see from the photo the leaves are almost transparent. We also saw Lemna minuta at Newport Wetlands, but this has a much darker green leaf and normally only two leaves together.