snow-on-the-mountain[snō′än t̸hə mo̵unt′'n]
snow-on-the-mountain definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
☆ a spurge (Euphorbia marginata) of the W U.S., with small flowers and the margins of the upper leaves white
snow-on-the-mountain definition by American Heritage Dictionary
A widely cultivated plant (Euphorbia marginata) of the central United States, having white-margined leaves and showy white bracts. Also called ghostweed.