What is "mistflower"

n. rhizomatous plant of central and southeastern United States and West Indies having large showy heads of clear blue flowers; sometimes placed in genus Eupatorium [syn: mist-flower, ageratum, Conoclinium coelestinum, Eupatorium coelestinum]

Mistflower is a common name for several plant species in the tribe Eupatorieae, especially:

• Ageratina riparia, native to Mexico, Cuba and Jamaica, and an invasive species in New Zealand and many tropical areas
• Members of the genus Conoclinium native to Canada, the United States and northern Mexico:
  • Conoclinium betonicifolium, Padre Island mistflower
  • Conoclinium coelestinum, blue mistflower
  • Conoclinium dissectum, palm-leaf mistflower