What is "epifagus"

Epifagus virginiana — commonly called beech drops (or beech-drops, or beechdrops) — is an obligate parasitic plant which grows and subsists on the roots of American beech. It is a member of the broomrape family. Epifagus is monotypic—containing only E. virginiana. The name Epifagus derives from Greek "epi" meaning "on" or "upon", and "Fagus" which is the genus name of beech.