Another plants that accompanies agriculture.
In cereal fields on dry calcareous soils you can find this small Sickle Leaf Spurge (Euphorbia falcata). Like all Spurges it has a white sticky latex that comes out when you break a stem or leaf. Because agriculture without herbicides and fertilizer has disappeared, it has become rare in Perigord, but in some places you can still find Sickle Leaf Spurge.
Spurge flowers are small and green or yellow, in this case well hidden inside heart-shaped bracts.