I've seen that plant often, from Oregon to Southeast Alaska, usually right near the beach. IIRC, it forms pods like peas. I don't know what it's officially called, but I call it wild peas, because that's what it looks like. When I was a child, I was warned by my mom that it was poisonous, although I suspect she had no idea, and was just alarmed that I might try it.

If you find an actual identification, I'd be interested in knowing it.

Thanks!