  We derive simple forms for saddle-node singular points of analytic foliations
in the real or complex plane just by gluing foliated complex manifolds. We give
the versal analytic deformation of the simplest model. We also derive a unique
analytic form for those saddle-node having a central manifold. By this way, we
recover and generalize results earlier proved by J. Ecalle by using mould
theory and partially answer to some questions asked by J. Martinet and J.-P.
Ramis in the 80's.
