Euphorbia marginata

{{Short description|Species of flowering plant}}

{{Speciesbox

|image = Euphorbia marginata - Snow-on-the-mountain WNWR.jpg

|image_caption = Snow-on-the-mountain, Wichita Mountains Wildlife Refuge

|status = {{TNCStatus}}

|status_system = TNC

|status_ref = {{cite web |last1=NatureServe |title=Euphorbia marginata |url=https://explorer.natureserve.org/Taxon/ELEMENT_GLOBAL.2.160342/Euphorbia_marginata |access-date=10 April 2024 |location=Arlington, Virginia |date=2024}}

|genus = Euphorbia

|species = marginata

|authority = Pursh

}}

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.{{PLANTS |symbol=euma8 |taxon=Euphorbia marginata |accessdate = 2012-09-29}} It is naturalized throughout much of China.{{EFloras|2|200012570|Euphorbia marginata |first1=Jin-shuang |last1=Ma |first2=Michael G. |last2=Gilbert |volume=11}}

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.{{Citation | last = International Plant Names Index | title = The International Plant Names Index | year = 2008 | url = http://ipni.org/index.html | access-date = 2008-12-30 | archive-date = 2015-08-13 | archive-url = https://web.archive.org/web/20150813113417/http://www.ipni.org/index.html | url-status = dead }}{{Citation | last1 = Lewis | first1 = Meriwether | first2 = William | last2 = Clark | editor-last = Moulton | editor-first = Gary E. | title = The Journals of the Lewis and Clark Expedition, Volume 12: Herbarium of the Lewis and Clark Expedition | publisher = University of Nebraska Press | pages = 359 | isbn = 978-0-8032-2931-0| year = 1983 }}