Euphorbia_marginata
Euphorbia marginata
Species of flowering plant
Euphorbia marginata (commonly known as snow-on-the-mountain, smoke-on-the-prairie, variegated spurge, or whitemargined spurge) is a small annual in the spurge family.
It is native to parts of temperate North America, from Eastern Canada to the Southwestern United States.[2] It is naturalized throughout much of China.[3]
The type specimen was collected in Rosebud County, Montana from the area of the Yellowstone River by William Clark during the Lewis and Clark Expedition.[4][5]