  With each antiholomorphic involution $\sigma $ of a connected complex
semisimple Lie group $G$ we associate an automorphism $\epsilon_\sigma$ of the
Dynkin diagram. The definition of $\epsilon_\sigma$ is given in terms of the
Satake diagram of $\sigma $. Let $H \subset G$ be a self-normalizing spherical
subgroup. If $\epsilon_\sigma ={\rm id}$ then we prove the uniqueness and
existence of a $\sigma $-equivariant real structure on $G/H$ and on the
wonderful completion of $G/H$.

Algebraic Geometry