Given to me by a neighbor
This species is quite common in southern California.
These plants are often called Lantana montevidensis, but are a hybrid of montevidensis and camara. Large yellow flowers do not occur in montevidensis.
The growth style is intermediate between the two parents, flowers are closer to camara, and the stem does not have spines.
I'm not 100% certain on the origin of the plant. Given it is a sterile hybrid, it is most likely planted but what an odd place for someone to plant one...
They weren't here a week ago...