This is one plant that not many people have heard of, yet it is such a sweet little shrub, I wonder why more folks don't have it? If you Google the name, many of the websites are about the Serissa in conjunction with Bonsai. Here is a good write up for the Serissa.
We have a couple in the Learning Garden and they are in the edge of the wooden area near our azaleas in part sun. It is in bloom from early spring until fall with tiny white trumpet shaped blooms. In our area it is semi-evergreen according to what I have read though these seem to retain their foliage.
They are hardy from zone 7-9 (or 11 depending on which website you read) and there are white blooms, pink blooms and a double white. It is a small shrub, barely getting 24 inches tall. Dark green leaves (which in my garden remain year-round) and a constant show of tiny blooms. A sweet shrub to have in any landscape.