Which has more species, Evolvulus or Centradenia?
Centradenia Centradenia is a genus of 4-5 species of tropical evergreen perennials or subshrubs, native to Central America and Mexico.
Machaonia Machaonia is a genus of flowering plants in the family Rubiaceae. It has about 32 species. All are indigenous to the neotropics. None has a unique common name. Some species have been called "alfilerillo", a Spanish name for the common and well-known genus "Erodium". The type species for "Machaonia" is "Machaonia acuminata".