  Extending results of Wyser, we determine formulas for the equivariant
cohomology classes of closed orbits of certain families of spherical subgroups
of $GL_n$ on the flag variety $GL_n/B$. Putting this together with a slight
extension of the results of Can-Joyce-Wyser, we arrive at a family of
polynomial identities which show that certain explicit sums of Schubert
polynomials factor as products of linear forms.
