  We analyze some properties of the four dimensional supergravity theories
which originate from five dimensions upon reduction. They generalize to N>2
extended supersymmetries the d-geometries with cubic prepotentials, familiar
from N=2 special K\"ahler geometry. We emphasize the role of a suitable
parametrization of the scalar fields and the corresponding triangular
symplectic basis. We also consider applications to the first order flow
equations for non-BPS extremal black holes.
