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Dianella ensifolia tree - raw materials incense 

The scientific name is Dianella ensifolia, each region has different first name. Called northern raven roots, or roots raven beak, central called Incense tree roots. Derived from the name, but there are many places that have mistakenly called clove, or patchouli. Note, cloves or clove and 1 aromatic herb, however, is not absolutely dianella ensifolia
So why is it called dianella ensifolia

You look straight into a tree (pictured), the leaves are symmetrical shape tidbits, like how posts are ordered, so-called folk post. Of course, this is very aromatic plants, essential oils are concentrated in the roots, the roots should be called Perfume.

Distribution:
Dianella ensifolia widely distributed in Southeast Asia: VN, Laos, Malaysia, the Philippines, Australia, India (Sri Lanka), Madagascar. In some cold water there: China, South Korea and Japan but lower quality.
Dianella ensifolia suitable for humid tropical monsoon suit hills and mountains. Do not tolerate waterlogging.
In Vietnam dianella distribution ensifolia most Nghe An (Thanh Chuong, Yen Thanh Quynh Luu Quy Hop ...), Ha Tinh, Quang Ninh also, Yen Bai ...