Euphorbia deppeana, a member of the Euphorbiaceae (spurge) family, is an erect subshrub up to 1.2 m (4 ft) tall with fuzzy branches. The hairless leaves, generally oval-shaped and often notched at their tips, are between 5 and 20 mm) (0.2 and 0.8 in) long and 5 and 12 mm (0.2 and 0.5 in) wide; they are arranged in two opposite rows along the stem. The leaf margins are usually toothed, rarely toothless. The small, petal-less flower clusters (cyathia), 1.5 to 3 mm (1.06 to 0.1 in) wide, are borne singly in the leaf axils (point between the stem and leaf stalk) and produce small capsules about 2 mm (0.1 in) long. Seeds not described.