A plant of the family Asteraceae (Compositae), Conoclinium (Eupatorium) coelestinum, with clusters of bluish flowers, native to the central and south-eastern United States.
Origin
Mid 19th century; earliest use found in Asa Gray (1810–1888), botanist.
Definition of mist flower in US English:
mist flower
noun
A plant of the family Asteraceae (Compositae), Conoclinium (Eupatorium) coelestinum, with clusters of bluish flowers, native to the central and south-eastern United States.
Origin
Mid 19th century; earliest use found in Asa Gray (1810–1888), botanist.