Aquilaria sinensis belongs to the plant family Thymelaeaceae. It is an evergreen tree, 6 to 20 m tall. The smooth bark is grayish to dark grey, and the wood is white to yellowish – so giving it another Chinese name “Pak Muk Heung” (White Wood Incense). Its branchlets are sparsely covered with hairs when young.
The tree produces agarwood, a valuable fragrant wood used for incense and medicine. Previously, the wood was used to make joss sticks and incense, but in Hong Kong this industry has died out.