Vetiver essential oil. Vetiveria Zizanoides Root Oil is a volatile oil obtained from the dried roots of Vetiveriazizanoides.

這個應該就改成或者合並：岩蘭草精油，或者岩蘭草油。因為岩蘭草精油本來就是從岩蘭草裏提取的，沒有人會從岩蘭草的葉子裏提取精油。所以岩蘭草精油本身就是特指的岩蘭草根油！！