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Mmm, that's what I thought too. We'll see what others think. Thanks.
I may be wrong so I would certainly wait for the opinions of others
The mnenonic "medics have needles" might be a help here. Medicks have a tiny point in the sinus of the leaf segments which is lacking in Trifolium species. I can't see any of these, hence my agreement with the original diagnosis.
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Thanks so much for your useful comment, Chris - a really good way of identifying and differentiating the plants.
... so in a few weeks, if not earlier, it will be easy to distinguish Trifolium dubium and Medicago lupulina.
This plant is just too early for me to be confident of calling it on flowers/fruits, but it appears to be emucronate - therefore lesser trefoil.
Lat/Lng: 53.5810492, -2.4262475
OS grid ref: SD718094
Growing in the borders of a disused car park.