Portulacaria

Portulacaria is a genus of succulent plant, classified in its own subfamily Portulacarioideae in the family Didiereaceae. It is indigenous to southern Africa.
Taxonomy.
The genus was previously placed in the family Portulacaceae, but according to molecular studies is part of Didiereaceae.
It has further been revised when phylogenetic tests showed conclusively that genus "Ceraria" was located within "Portulacaria", and all "Ceraria" species have consequently been renamed and moved into this genus.
Species.
Species include:
Uses.
"Portulacaria afra" normally uses (or Hatch-Slack) carbon fixation but is also able to switch to CAM carbon fixation when drought stressed.
It is a local delicacy and its leaves are eaten by the local peoples. It is also popular internationally as a garden plant. Because of its superficial resemblance to some species in the family Crassulaceae, most of which are toxic, the two are readily, and possibly dangerously, confused by people unaware of the differences.