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usually uncountable, plural ageratums
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. quotations examples
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, George Washington Cable, Bonaventure, New York: Scribner, “Grande Pointe,” Chapter 2, pp. 77-78
They helped carry things up a sidewalk bordered with a purple fringe of ageratums into the small house behind the parsonage.
1988, Barbara Kingsolver, chapter 17, in The Bean Trees, New York: HarperPerennial, page 218
A stone path edged with ageratum leads to the grape arbor […]
1993, Carol Shields, The Stone Diaries, London: Fourth Estate, page 195