One of the mysteries of the English language finally explained.
Either of two common spurges, petty spurge, Euphorbia peplus, and sun spurge, E. helioscopia; (also) the white latex contained in these plants, which can irritate the skin.
Late 16th century; earliest use found in Henry Lyte (1529–1607), botanist and antiquary. From the genitive of devil + milk, after Dutch duivelsmelk and German Teufelsmilch.
devil's milk/ˌdɛvlz ˈmɪlk/
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