Classification : Kingdom Plantae, Divisi Magnoliophyta, Kelas Magnoliopsida, Ordo Urticales, Family Moraceae, Genus Streblus, Species Streblus asper Lour
Sinonim : Calius lactescens Blanco; Streblus lactescens Blanco

Streblus asper tree is known by several common names, including Siamese rough bush, Khoi, shaved and toothbrush tree. It is a medium-sized tree native to the area dry in Thailand, India, Malaysia and Vietnam.
In the Republic of the Philippines, which is commonly known as "bogta-e" or "bogtalay" known
The leaves are 2 to 4 inches long, stiff, oval, irregular cut, and continue rods. manly ball-shaped flower heads with small flowers. female flowers have long stems.
The tree has a number of applications. It was important for 700 years in Thailand in the production of paper. Almost all ancient documents written on Thailand still available this bark. Buddhist texts and official records from the period before the twentieth century in Thailand known as khoi book. This paper durable even in the local climate with high humidity. It is not easy to burn and resistant to yellowing and insect damage. Today other sources of fiber used to make paper and fiber Khoi mainly used by craftsmen to produce paper using traditional techniques.

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