Parentucellia

Parentucellia is a small genus of flowering plants in the family Orobanchaceae containing about four species. They are known generally as glandweeds. The genus was named for Pope Nicholas V, whose surname was Parentucelli.
Phylogeny.
The phylogeny of the genera of Rhinantheae has been explored using molecular characters. "Parentucellia" belongs to the core Rhinantheae. It is closely related to the genus "Bellardia", and then to "Odontites", "Tozzia" and "Hedbergia". In turn, these genera share phylogenetic affinities with "Euphrasia" and "Bartsia".
Systematics.
Species include: