What is "zamioculcadoideae"

Zamioculcadoideae is a subfamily of flowering plants in the Araceae family that consists of two genera, Zamioculcas and Gonatopus. It was proposed in 2005 by Bogner and Hesse after molecular studies indicated the need for the subfamily. There are also some genetic indications that Stylochaeton should be included in the subfamily.