1. (noun) rhizomatous plant of central and southeastern United States and West Indies having large showy heads of clear blue flowers; sometimes placed in genus Eupatorium

• conoclinium coelestinum
• eupatorium coelestinum
• mist-flower
• mistflower

1. (noun) any plant of the genus Ageratum having opposite leaves and small heads of blue or white flowers

• ageratum houstonianum
• common ageratum

1. (noun) rhizomatous plant of central and southeastern United States and West Indies having large showy heads of clear blue flowers; sometimes placed in genus Eupatorium

• conoclinium
• genus conoclinium

2. (noun) any plant of the genus Ageratum having opposite leaves and small heads of blue or white flowers

• genus ageratum

1. (noun) rhizomatous plant of central and southeastern United States and West Indies having large showy heads of clear blue flowers; sometimes placed in genus Eupatorium

• flower

2. (noun) any plant of the genus Ageratum having opposite leaves and small heads of blue or white flowers

• flower