- mistflower, mist-flower, ageratum, Conoclinium coelestinum, Eupatorium coelestinum - rhizomatous plant of central and southeastern United States and West Indies having large showy heads of clear blue flowers; sometimes placed in genus Eupatorium
--1 is a kind of flower
--1 is a member of Conoclinium, genus Conoclinium - ageratum - any plant of the genus Ageratum having opposite leaves and small heads of blue or white flowers
--2 is a kind of flower
--2 is a member of genus Ageratum
--2 has particulars: common ageratum, Ageratum houstonianum