I’ve been aware of this for a while
Introduction to Duckweeds (bsbi.org)
and puzzled by the statement that Lemna minor may not be the most common.
It is explained in this:
PowerPoint Presentation (bsbi.org)
I don’t know what its date of publication is. So it will be interesting to see how BSBI deals with this. I can’t see all the county recorders reducing their Lemna minor records to just Lemna. Very few will be supported by vouchers.
Undated is not very helpful.
I’ve emailed BSBI to ask.
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