What is "mist flower"

Mist \Mist\ (m[i^]st), n. [AS. mist; akin to D. & Sw. mist, Icel. mistr, G. mist dung, Goth. ma['i]hstus, AS. m[=i]gan to make water, Icel. m[=i]ga, Lith. migla mist, Russ. mgla, L. mingere, meiere, to make water, Gr. ? to make water, ? mist, Skr. mih to make water, n., a mist m[hand]gha cloud.

1. Visible watery vapor suspended in the atmosphere, at or near the surface of the earth; fog.

2. Coarse, watery vapor, floating or falling in visible particles, approaching the form of rain; as, Scotch mist.

3. Hence, anything which dims or darkens, and obscures or intercepts vision.

   His passion cast a mist before his sense.
   --Dryden.

   Mist flower (Bot.), a composite plant ( Eupatorium c[oe]lestinum), having heart-shaped leaves, and corymbs of lavender-blue flowers. It is found in the Western and Southern United States.