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... to visually distinguish Matricaria recutita from Tripleurospermum inodorum. Why do you think it is the latter?
I chose the latter as I didn't notice any smell although I didn't try and smell the flowers. In the book I checked it said in the former the receptacle of the flower head is more conical and finally I googled images of both and decided it looked more like the latter. I am not sure about it but I think it is more likely. I have added another photo in case it helps
Lat/Lng: 52.455381666667, -0.57305305555556
OS grid ref: SP970851