GOOD KING HENRY (Chenopodium Bonus-Henricus), a perennial herb of the goose-foot family (Chenopodiaceae), found in Great Britain and naturalized in North America from Nova Scotia to Ontario and southward. It is a smooth, dark green, little branched plant, about 2 ft. high, with usually entire halberd shaped leaves. The plant is cultivated as a pot-herb, in lieu of asparagus, under the name mercury or all-good. (See CHENO PODIUM.)