A genus of about 100 species (with Aphyllon, Myzorrhiza, and Phelipanche removed, as here), holoparasitic herbs, of mainly Eurasia.
Ref: Collins, Colwell, & Yatskievych (2019c) In Flora of North America Editorial Committee (2019); Joel (2009); Manen et al. (2004); Musselman (1982); Park et al. (2008); Schneeweiss (2013); Thieret (1971). Show full citations.