Two cultivars of the filbert tree or shrub, the purple-leaved filbert (Corylus maxima Purpurea) and the purple-leaf European filbert (Corylus avellana Fusco-Rubra), produce purple leaves and work well in landscapes as screens or hedges.
Cambodia (7.5 million). The national language is Khmer, spoken by about 85 percent of the population. It is co-official with French, which has perhaps 500,000 speakers. Chinese and Vietnamese are each spoken by about 400,000 people. Among tribal languages, Cham is the most important, with about 100,000 speakers.
Khmer in Vietnam. The Khmer language, also called Cambodian, is a Mon-Khmer language spoken by most of the population of Cambodia, where it is the official language, and by some 1.3 million people in southeastern Thailand, and also by more than a million people in southern Vietnam.