Wormwood
Artemisia absinthium
Family:
Asteraceae, Aster family
Where to find it :
Originally from the Mediterranean area and Central Europe. Can be found in the wild all over Europe on dry, sandy soil.
Part(s) used:
whole herb
Special constituents:
Essential oil containing α- and β-thujone to about 35%, azulenes and other constituents; Sesquiterpene lactones, including artabsin, absinthin, anabsinthin, artemetin and others.
Correspondance:
27 (Crowley, Culpeper, Cunningham)
Use:
Against insects, ingredient of absinth, stimulates digestion, promotes appetite. Magical: protection, clairvoyance
Absintalsem 
Malurt Wormwood is very bitter, maybe the most bitter herb on Earth after Rue. The latin name absinthium comes from the latin word for bitter, absinthial. Artemisia is probably a reference to the goddess Artemis, who loves the herbs from this genus.
Wormwood has been used against gut worms, and also against all kinds of stomach problems since the Romans (or even earlier!) It has also been used to ease childbirth, against colds etc. It contains azulenes, which makes it efficient against infections. But thujone is toxic; if you want to used Wormwood, buy a thujone-free extract (or use very small amounts of the herb).
Wormwood is the main ingredient of the drink Absinth. The thujone content made Absinth-drinking quite a dangerous affair, at least if one became addicted to the drink. Thujone poisoning leads to hallucinations, insomnia, and cramps. However, it is doubtful whether the absinth-drinkers really became poisoned on the thujone, or whether it just was a case of regular alcoholism that lead to "absinthism", as it was called. Absinth is a very strong drink, with an alcohol content of 50% or more. So you don't need many glasses to get very drunk. And you need a lot of glasses to get to a toxic level of thujone, as there are only a few mg thujone pr. glass thujone.
Cunningham writes that if you burn the herb on a graveyard, the dead will rise and speak with you.
The essential oil can be mixed with: Oak moss, jasmine, orange, lavendel. Do not ingest the essential oil! Do not use the essential oil if pregnant.