eastern baccharis

This is Baccharis halimifolia in the family Asteraceae:

This photo was taken in November of 2006 across from the JSU stadium in Jackson, Mississippi.  B. halimifolia is native to the United States and found along the mainly along southeastern seaboard but ranges from Texas to Massachusetts. 

This is one of the first plants I photographed.

Chinese privet

This is an example of Ligustrum sinense in the family Oleaceae:

I found this plant along the road leading into Mule Jail on April 28, 2007.  This plant is not native to the United States and according to Wikipedia, was introduced from southeast Asia as an ornamental plant.

By the by, the National Parks Service has a pdf on invasive species that is worth a look.