Mini-Show Succulent November 2019: Pelargonium, Sarcocaulon. Tylecodon
Three related genera from Africa.
Mini-Show Cactus November 2019: South American columnar cactus (Espostoa, Oreocereus, Cleistocactus, etc.)
Columnar cacti are not a closely related set of genera, but a lumping together of all the cacti that are much longer than they are around.
Mini-Show Succulent October 2019: Adromischus
A genus of at least 28 species of small clumping leaf succulents from South Africa.
Mini-Show Cactus October 2019: Turbinicarpus
A small (but growing) genus of small plants from Northeastern and Central Mexico.