Rhinanthus

Rhinanthus (rattle) is a genus of annual hemiparasitic herbaceous plants in the family Orobanchaceae, formerly classified in the family Scrophulariaceae. The genus consists of about 30 to 40 species found in Europe, northern Asia, and North America, with the greatest species diversity (28 species) in Europe.
Phylogeny.
The phylogeny of the genera of Rhinantheae has been explored using molecular characters. "Rhinanthus" is the sister genus to "Lathraea", and then to "Rhynchocorys". These three genera share phylogenetic affinities with members of the core Rhinantheae: "Bartsia", "Euphrasia", "Tozzia", "Hedbergia", "Bellardia", and "Odontites". "Melampyrum" appears as a more distant relative.