Sounds like Golden Marguerite....I used to have these and they are lovely but can get away from you if you let them. I would pull them like weeds when they'd grow where I didn't want them. I also found that they'd lean a lot when the mass of them got thick and I never found a good way to keep them from doing that. I miss them though...they are so sunny!
Kristy :)

Here is a link that might be useful: Golden Marguerite

Yup, sounds like Marguerite. They provide lots oc color but do seed themselves. I leave a few to seed for next year but deadhead lots of them.