NEPENTHA′CEÆ, Nepenths, a natural order of Exogenous Plants inhabiting the damper and warmer parts of Asia, and having, in the place of leaves, large hollow bodies furnished with a lid, and containing water secreted from a peculiar glandular apparatus with which they are lined. […] [T]he adherent ovary of Birthworts, their highly developed calyx, axile placentation, and hermaphrodite flowers, are serious difficulties in the way of a close contact between them and Nepenths, unless the peculiar structure of the wood, the consideration of which I for the present abandon, should lead to the final establishment of the class of Homogens, in which case Nepenths and Birthworts will be brought into contact or at least a near neighbourhood.
Source: wiktionary