Monotropsis Schweinitz in Elliott.
A genus of probably 2 species, mycoheterotrophic herbs, of se. North America. Monotropsis is heteromycotrophic, receiving its nutrition by association with a mycorrhizal fungus (which itself is associated with tree species, perhaps oaks or pines), the intertwined root mass and fungal mantle about 1-2 cm in diameter. There is a plausible case that the proper name for the genus is Schweinitzia Elliott ex Nuttall (Rose & Freudenstein 2014).
Ref: Bidartondo & Bruns (2001); Chafin (2000); Chafin (2009); Klooster, Clark, & Culley (2009); Rose (2012); Rose & Freudenstein (2014); Stevens et al. In Kubitzki et al. (2004); Wallace (1975); Wallace (2009b. In Flora of North America Editorial Committee (2009); Weakley (2009a); Wolf (1922). Show full citations.