Ruminate endosperm occurs in 

Ruminate endosperm is the condition in which the endosperm is dissected by in-growths of the seed coat, is a common condition in the palms or Annonaceae. This type of  endosperm develops early and hence the in-growths are formed directly into its tissue.

Seeds of Annonaceae are characterized as possessing are one to many pistil; have a fleshy and usually brightly colored cover, have ruminate endosperm (nutritive tissue surrounding the embryo) and are oily.

hence, answer is 'Annonaceae'.