ageratum

noun

1. (uncountable, usually)Any 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.

   “1888, George Washington Cable, Bonaventure, New York: Scribner, “Grande Pointe,” Chapter 2, pp. 77-78, 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.”

   “They helped carry things up a sidewalk bordered with a purple fringe of ageratums into the small house behind the parsonage.”

   “A stone path edged with ageratum leads to the grape arbor […]”