How are Obregonia and  Trichodiadema different from each other?
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.
Obtegomeria Obtegomeria is a genus of flowering plant in the Lamiaceae family, first described in 1998. It contains only one known species, Obtegomeria caerulescens, endemic to the Sierra Nevada de Santa Marta in northern Colombia.