A large plant genus of the family EUPHORBIACEAE, order Euphorbiales, subclass Rosidae. They have a milky sap and a female flower consisting of a single pistil surrounded by numerous male flowers of one stamen each. Euphorbia hirta is rarely called milkweed but that name is normally used for ASCLEPIAS.
    

concept

Four types of spurge (Euphorbia species): two succulent stems and two low-growing plants. Coloured etching by J. Pass, c. 1805, after J. Ihle.

A plant (Euphorbia sp.): flowering plant with separate flower and fruit. Coloured etching by M. Bouchard, 1772.

Euphorbia

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Wood spurge (Euphorbia amygdaloides): flowering stem and floral segments. Coloured engraving after J. Sowerby, 1795.

A plant (Euphorbia sp.): flowering plant with separate flower and fruit. Coloured etching by M. Bouchard, 1772.

A plant (Euphorbia sp.): flowering plant with separate flower and fruit. Coloured etching by M. Bouchard, 1772.

Four types of spurge (Euphorbia species): two succulent stems and two low-growing plants. Coloured etching by J. Pass, c. 1805, after J. Ihle.

Four flowering plants, all types of spurge (Euphorbia species). Chromolithograph by W. Dickes & co., c. 1855.