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.
Cham is not only spoken by around 200,000 people in Cambodia, but also by approximately 100,000 in Vietnam and others in Southeast Asia. It belongs to the Austronesian family. Cham had many more speakers during the time of the Champa Empire, which ruled what is now central Vietnam from around the 7th century to 1832.