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Thanks, David. I didn't know whether this was an 'agg.' or whether I could record it to species. Would you believe that the plant list for the church now stands at 118 species - not bad for the start of July in year 1 in such a relatively small area!
1) this is not Polygonum arenastrum, and the other common inland species is Polygonum aviculare. But there both rarer (P. rurivagum), coastal (P. oxyspermum) and Scottish (P. boreale) species.
2) I understand that there is a reclassification, with more species, in the works. (Mentioned at http://www.ispot.org.uk/node/177378)
So by most current floras, Polygonum aviculare is correct. But I intend to revise all my records of this to Polygonum aviculare agg.
That's really helpful, thanks.
Lat/Lng: 50.6876, -1.5327
OS grid ref: SZ331876