High Quality Content by WIKIPEDIA articles! Artemisia cina, commonly known as santonica (zahr el shieh el -khorasani), Levant wormseed, and wormseed, is an herbaceous perennial of the daisy family. Its dried flowerheads are the source of the vermifugic drug santonin since ancient times. Its common names arise from its known ability to expel worms. The powder is grayish-green in colour with an aromatic odour and a bitter taste. The plant is characterised by its spherical pollen grains, which are typical in the Compositae family, a fibrous layer on anthers, lignified, elongated, hypodermal sclerids, and clusters of calcium oxalate crystals.

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