The sweetbay magnolia (Magnolia virginiana) is a flowering tree or shrub that can be either evergreen or deciduous depending on the USDA Zone where it is grown.This is an example of a type species, which is a plant that is considered to be the prime example for species in a genus. It was the first species to receive this genus name and other species were later included in Magnolia because of their genetic similarity to the sweetbay.