1. (

• 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 ;

2. (

• ageratum ,

) any plant of the genus Ageratum having opposite leaves and small heads of blue or white flowers ;