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Possibly Ranucunculus auricomus but cant see enough to be certain
Often does not have a full complement of properly formed petals
Yes, it is apomictic (or, more precisely, agamospermous), produces achenes without need of fertilisation, so does not need to attract insect pollinators.
This means that there are numerous genetic races that sometime will be split into a large number of separate microspecies (like brambles, danelions, hawkweeds, etc.). I understand the work has been done, will be published in due course.
Some of these genetic entities have a full set of well-formed petals, others have them small, malformed or absent.
Lat/Lng: 51.4, -1.0
OS grid ref: SU7271