Snow-on-the-Mountain, native to the Great Plains and introduced in much of the rest of the country, has been added to the USWildflowers database (02/02/2019.) Scientific name is Euphorbia marginata. Photo below was taken at a rest area in Kansas on Aug 24, 2016. Go to the Snow-on-the-Mountain detail page for more information and photos.

Snow-on-the-Mountain – Euphorbia marginata