It is isolated from the leaves and flowers of Artemisia annual. (Compositae), commonly known as the sweet wormwood, a cousin of tarragon.

• 它是一种从青蒿属植物中分离出来的药物。青蒿属植物亦属于菊科，人们通常就把它称之为青蒿，是龙蒿的同类。