Winterberry holly is all the more showy because its lack of leaves in winter makes the berry display stand out. (Courtesy) When most people think of holly they envision bright red berries, glossy evergreen leaves and Christmas decorations. They are surprised when they find out that winterberry, Ilex verticillata, is a holly, because this holly does not fit that pattern. Winterberry is a species of holly that is found in its native habitat primarily in the Eastern United States.