Texas Gardening: Texas Native Plant Pictures by color ( White ), 1 by bettydee

bettydee wrote:
Snow-On-the-Mountain, Euphorbia marginata, Euphorbiaceae Family, Texas native, annual

One to three feet high. Plant usually starts as a single tall stem dividing toward the top. Leaves are large, oval and a strong grayish-blue green with entire margins. Toward the inflorescence the leaves get narrower and have a white margin. The white margins get broader as they near the top. Snow-On-the-Mountains differ from Snow-On-the-Prairie in that the leaves of the latter are narrower.

At the top of the plant are what appear to be 5-petaled "flowers." These are not flowers, but involucral cups that contain the real flowers. The milky white sap that can irritate the skin in humans is also toxic to livestock. It is seldom fatal to them, but it causes mouth and gastrointestinal irritations that lead to severe weight loss and may take months to recover.

Note: Texas Wildflowers by Campbell and Miller, pg 97, describe Snow-On-the-Prairie, use the correct scientific name, but call it Snow-On-the-Mountain.
For more information, see the PlantFiles
http://davesgarden.com/pf/showimage/8109/