How are Obregonia and  Trichodiadema different from each other?
Trichodiadema Trichodiadema is a genus of succulent plants of the family Aizoaceae.
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.