Note: This genus has yet to fully accepted in Orobanchaceae, although the evidence presented by McNeal et al (2013) shows this genus to be sister to the rest of the family, hence its circumscription here.
McNeal, J.R., Bennett, J.R., Wolfe, A.D., & Mathews, S. (2013) Phylogeny and origins of holoparasitism in Orobanchaceae, American Journal of Botany, 100: 971–983. Appendix S3, page 1. Optimal phylogenetic tree inferred from PHYB using RAxML (Stamatakis, 2006) and assuming a general-time-reversible model of evolution and 4 nucleotide rate classes. Available on line.
Stevens, P.F. (2001 onwards) Angiosperm Phylogeny Website. Version 12, July 2012 [and more or less continuously updated since]. . Species list on .