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The white mugwort" Artemisia herba alba" is a medicinal and aromatic plant used for a long time in the Algerian traditional medicine. It is the best known mugwort in Algeria. Different qualitative and quantitative aspects of A. herba alba are the subject of this study. the extraction yield of the essential oil of A. herba alba is 0.68%, the phytochemical screening by colour reaction and TLC (Thin Liquid Chromatography) showed the richness of this plant in active compounds, namely polyphenols, flavonoids (flavonols and flavones), alkaloids, triterpenes, coumarins, quinones and anthracene derivatives. White mugwort is a source of substances (essential oil) that have remarkable effects on the biological level.