alienplantslime said:True Myrtle might be it! The pictures look pretty much exactly like it, but the leaves of true myrtle are larger than that of my tree/bush. They are listed as being 2-5 cm while mine are uniformly within 1-1.5 cm. Is there a similar myrtle with smaller leaves?
There are several varieties of M. communis and I don't consider myself an expert on the species. I know some have smaller leaves (compacta) but I don't know if the plant will grow as large as yours. There is also a variety called twisted myrtle which can get large but the foliage is arranged in a distinctive spiral pattern. On the campus of UC Davis there is a beautiful twisted myrtle that is a medium sized tree.
According to Wikipedia there are 2 other species but I know nothing about them.
What ever yours is, it is very nice.