I have several instances of this yellow flower growing around my property (usually in my lawn grass). As far as I know, it isn't anything that was ever intentionally cultivated.
This is in the American northeast, but it looks suspiciously like something that also grew at my old house in the midwest (but that was over a decade ago and I have no way to verify).
It looks a little like rapeseed, but the leaves don't look right? Also, it seems to be a perennial, or at least, tends to grow back in the same spot for multiple years, whereas if I am understanding correctly, rapeseed is an annual.
Anyway, here's a picture. In theory I can go take more pictures if it would be helpful (maybe someone can suggest what I should try to photograph, specifically?). The pipes are part of a livestock gate, probably 1"-2" diameter, so that may help give a sense of scale. In this picture, I would guess the stalks are 6"-12" tall, but I've seen them grow to maybe 24" or so. (This picture was taken a few days ago, so late spring, specifically late May.)