These years later they still surprise me. I have been standing next to this one all winter long without knowing what it was. It's where I would station my tripod when photographing the neighbourhood Anna's Hummingbird. I saw it as a shrubby little tree, and didn't give it a second thought.
But no, *plinnnggg,* it's a Goldenchain. Which Laburnum it is I'm not sure. There are two wild species, native to the mountains of southern Europe, L. anagyroides (Common Laburnum) and L. alpinum (Alpine Laburnum). Most often cultivated is a hybrid of the two, which has the most extravagant flower clusters.