This is Pseudolithos migiurtinus . Rhipsalis are jungle cacti with pencil-like or flattened, barely succulent stems. This is Rhipsalis cereuscula . And here's Rhipsalis rhombea , one of the flat-stemmed species. It's been placed in various families by different authorities.
Sansevierias come from Africa.
Sarcocaulon is similar to the succulent pelargoniums, but its species have spines and somewhat different flowers. They, too, are winter growers. This one is Sarcocaulon pattersonii . Selenicereus macdonaldiae comes from Central America. I couldn't get a picture of one, so here's a bunch of assorted Selenicereus and related Hylocereus climbing up a palm tree.