  In this article we characterize the foliations that have the same Newton
polygon that their union of formal separatrices, they are the foliations called
of the second type. In the case of cuspidal foliations studied by Loray, we
precise this characterization using the Poincar\'e-Hopf index. This index also
characterizes the cuspidal foliations having the same desingularization that
the union of its separatrices. Finally we give necessary and sufficient
conditions when these cuspidal foliations are generalized curves, and a
characterization when they have only one separatrix.
