This is blooming right now in Mo (and probably NC if I recall correctly). It has smooth bark, smooth medium-green leaves that are opposite compound (pinate) and smooth on both sides. Stems are light brown. It has small racemes of tiny white flowers that hang down under the stem and it is very fragrant (right now it is out-competing the honeysuckle!). Flowers are clublike when closed, and open from lower racemes to upper racemes and each tiny flower has four petals and 2 stamen with brown anthers. It can grow quite tall (I saw one as tall as the other trees in the area) and also can grow like a woody vine if cut back. The ones I saw that were growing tree-like had several thin, smooth-barked trunks, like a crepe myrtle or ficus. I have been looking online, but haven't found one yet. Its not a spirea, nor a privet, nor a honeysuckle as far as I can tell.