Euphorbia peplus foliage

Euphorbia peplus, known in English as "petty spurge" or "radium weed" and in French as ésule ronde or euphorbe péplus, is an annual native to Europe, western Asia, and northern Africa. I think it's rather pretty, but apparently its sap is poisonous: it can irritate the skin and eyes (though I haven't had any problems pulling it out bare-handed), and causes "complications" when eaten.