A yellow-flowered composite growing in the gravel on the railway track.
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A Ragwort! It's like one of those optical illusions where it's one thing, then suddenly it's another. How can you be sure it's the Oxford from this photo? Don't you have to check that the achenes are all hairy?
Lat/Lng: 51.376836, 0.007221
OS grid ref: TQ397661