Lorianne and ..deb: Apparently, the answer to the mystery is simple: Linneaus, knowing that ragweed was so bitter it could render the milk of cows who grazed it unpotable, decided to make a joke. Swedish humor, you know. (That’s on the authority of Edwin Rollin Sencer, author of the Dover reprint All About Weeds.) I don’t know if there’s any implied connection beween this supposed ambrosia and Artemis or not. (Artemis’s name became attached to the wormwood genus because she was thought to protect against disease and pestilence, and the wormwoods are very effective antiseptic agents.)