Mellow Yellow

Just now there has been a burst of yellow in the hedgerow.  There is a lot of similarity in structure as well as time of flowering:

Meadow Vetchling

Meadow Vetchling  - leaves in pairs

Black Medic  (Yes black! - that's the colour of the seeds)

Clump of Black Medic (round leaves is threes, clover like flower structure)

Birdsfoot Trefoil  (Leaves in threes developing fruit like hens claws)

Birds Foot Trefoil also known as Bacon and Eggs - presumably because it develops a reddish tinge?

Dear little Buttercup - or a creeping menace? 

Giveaway buttercup leaves at base of stem