Hop trefoil or Black Medick maybe !!?!

Hop trefoil or Black Medick maybe !!?!

Observation - Hop trefoil or Black Medick maybe !!?!. Description: Say this in a grassland country park on the edge of a woodland. Think its either black medick or hop trefoil, any ideas

Say this in a grassland country park on the edge of a woodland. Think its either black medick or hop trefoil, any ideas