High Quality Content by WIKIPEDIA articles! Artemisia vulgaris (mugwort or common wormwood) is one of several species in the genus Artemisia which have common names that include the word mugwort. This species is also occasionally known as Felon Herb, Chrysanthemum Weed, Wild Wormwood, Old uncle Henry, Sailor`s Tobacco, Naughty Man, Old Man or St. John`s Plant (not to be confused with St John`s wort).