Honeysuckles trees. SoCal--I guess I have some of those myself...on fences, up other trees, under trees. Where I live, they can get out of hand!
I found the list. It has 75 that do well with less than 6 hrs. It's good you have some sun. In general, light colored roses do well, as well as most ground-cover roses, single roses with 6-12 petals, most hybrid musk roses, and certain miniature roses, vigorous HT's, and some hybrid china and Austins. The colors range from white to apricot and apricot blend, Orange blen and orange pink, mauve, pink and pink blend, yellow and yellow blend, pink and pink blends. Looks like there are a lot of choices!