Spotted Spurge (Euphorbia maculata) is another common plant of sidewalk cracks and other urban habitats. Though superficially similar to Prostrate Knotweed in its growth form it is easily distinguished from the knotweed by its opposite (not alternate) leaves, reddish-brown stem and the milky sap that oozes from broken stems. A variable feature is the elongated dark maroon blotch on the leaves. In some plants - such as this one - the maroon mark is lacking entirely.
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