Does Ixora or Mesquite have more species?
Mesquite Mesquite is the common name for the genus "Prosopis", containing over 40 species of small leguminous trees. They are native to the southwestern United States and Mexico (even the creeping mesquite, which is invasive in southern California).
Aztekium ritteri Aztekium ritteri is a species of cactus, in the genus "Aztekium". It is one of the two species that make up the genus. The species originated in Mexico. Aztekium is a genus endemic to Mexico.