ageratum noun1 •Any member of the genus Ageratum of tropical American herbs, annuals and perennials, from the sunflower family Asteraceae, tribe Eupatorieae; they are sometimes used in floral displays.The way before him was little more than a bridle-path along the earth […] . The soft blue tufts of the ageratum were on each side continually. — 1888 formsageratums
