  Guionnet et al. gave a construction of a II_1 factor associated to a
subfactor planar algebra. In this paper we define an unshaded planar algebra.
To any unshaded planar algebra P we associate a finite von Neumann algebra M_P.
We prove that M_P is a II_1 factor that contains a generic maximal abelian
subalgebra called the cup subalgebra.
