Rumex venosus is a species of flowering plant in the knotweed family known by the common names veiny dock, winged dock, sand dock, and wild-begonia (though it is not related to the genus Begonia). While not of any particular agricultural use, its cousins rhubarb and buckwheat are. It is native to central and western North America, from southern parts of the Canadian prairies, through to Mexico.

It can be found in many types of habitat, including sagebrush, dunes, and other sandy areas. It is commonly found in heavily grazed pastures as livestock tend to avoid it, allowing veiny dock to spread uninhibited. It is a common food plant of the ruddy copper butterfly.

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