Leaves and flowers of Ilex aquifolium 'Silver Queen' holly cultivar. This cultivar, despite its name, is actually male, and so has no berries. It is suitable for hedging, and with its varigated leaves also makes a good shrub.
Description from Wikipedia (http://en.wikipedia.org/wiki/Ilex_aquifolium):
Ilex aquifolium (Holly, or European Holly to distinguish it from related species, may also be called Christmass Holly or Mexican Holly) is a species of holly native to western and southern Europe, northwest Africa and southwest Asia.
It is an evergreen tree growing to 10-25 m tall and 40-80 cm (rarely 1 m or more) trunk diameter, with smooth grey bark. The leaves are 5-12 cm long and 2-6 cm broad, variable in shape; on young plants and low branches, with three to five sharp spines on each side, pointing alternately upward and downward; on higher branches of older trees with few or no spines except for the leaf tip, often entire.
The flowers are dioecious, white, four-lobed, and pollinated by bees.