Do Waldsteinia and Obregonia contain the same number of species?
Obregonia Obregonia, the artichoke cactus, is a genus of cacti with a single species, Obregonia denegrii. The species is endemic to the state of Tamaulipas in Mexico.
Nivenioideae Nivenioideae subfamily is one of the two main subfamilies in the popular Iridaceae family. It contains seven genera, from South Africa, Australia and Madagascar, including the only true shrubs in the family ("Klattia", "Nivenia" and "Witsenia"), It also includes "Aristea", "Cleanthe", Patersonia and also "Geosiris", which was in its own family until being re-assessed.