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This stem holds 9 tiny orchid-like flowers, some still yet to open. The leaves only measure approx 2cm long, and it looks like little tendrils coming at leaf/stem joint.
It is in my garden in Oxfordshire England. I saw the flowers while pulling up unwanted stuff. It's very tiny, thought I'd got a little orchid at first, it does look as though it could be from the pea family,
I would place this in the pea family - the flower shape, the tendrils and the squareish stem are a hint. This website illustrates the characteristics quite nicely.
This appears to be a member of the Lathyrus genus, commonly known as sweet peas. In gardens, one would probably first think of l. odoratus, the classic sweet pea, but there are a few "cousins" with narrower leaves like l. sylvestris. While typical flower colors are in the pink-to-lavender range, sweet peas have been breed in yellow-orange tones as well.
Taking the origin and further description into account, I'd suggest l. pratensi (Meadow Vetchling) as best match, various sources show more or less distinct stripes on the "banner", yours being of the more distinct type.
Most likely Birdfoot Trefoil, the bees love it!
