I'm sorry, I don't have a photo again, but perhaps somebody might recognize this one via description.

It's a creeping weed with roots that are difficult to pull- stubbornly rooted, anyway. Viney. True green (like Crayola Crayon Green), small round leaves, that eventually produce small, bright yellow pretty flowers. Oddly enough, the flowers at least seem to have a very cilantro-esque scent, dunno why.

This could be something the person who lived in this house before us planted unwittingly down there, but I think it's a weed. Anybody know it?...