Ruminate endosperm is found in 

Ruminate endosperm: A structure of the endosperm made of albumen of a seed which gives a mottled appearence to its section, and which results from the infolding of a dark inner layer of the seed-coat into the light-coloured matter of the endosperm, as in the nutmeg. Examples of families with ruminate endosperm - Rubiaceae, annonaceae, aristolochiaceae, Palmaceae and Myristicaceae.