This is a big tree growing up to 60 to 80 feet and with thick stem of 3 to 4 ft diameter. It is native to South East Asia. The bark is papery thin and was sometimes used for writing like Betula utilis tree bark (Bhojpatra in Sanskrit). Leaves are thin like leather, shiny and up to 3 inches long. Flowers are white in color and fruit is 1 to 2 inches long, smooth and thin Aquilaria crassna has been used in traditional Asian medicine to treat vomiting, rheumatism, asthma and cough. Earlier studies from our laboratory have revealed that the essential oil extracted from agarwood also inhibited colorectal carcinoma cells, most commonly known as colon cancer.