Ceraria namaquensis, with the common names Namaqua porkbush and Namaqua portulacaria, is a species of succulent shrub, native to the border between South Africa and Namibia.
Calamintha is a genus of plants that belongs to the family Lamiaceae.
 Commonly called the calamints, there are about eight species in the genus (around 30 before revisions in taxonomy) which is native to the northern temperate regions of Europe, Asia and America.
Portulacaria fruticulosa (previously "Ceraria fruticulosa" or "Ceraria schaeferi") is a succulent plant found on the border between Namibia and South Africa.
Portulacaria is a genus of succulent plant, classified in its own subfamily Portulacarioideae in the family Didiereaceae.
 It is indigenous to southern Africa.
Portulacaria afra (known as elephant bush, dwarf jade plant, porkbush and spekboom in Afrikaans) is a small-leaved succulent plant found in South Africa.
Portulacaria armiana (previously "Ceraria armiana"), also known as the whipstick-porkbush, is a succulent plant found on the border between Namibia and South Africa.
Portulacaria carrissoana (previously "Ceraria carrissoana" or "Ceraria kuneneana") is a shrubby succulent plant found on the border between Namibia and Angola.
Portulacaria pygmaea (previously "Ceraria pygmaea"), also known as the pygmy porkbush, is a small-leaved dwarf succulent plant found on the border between Namibia and South Africa.
Portulacaria longipedunculata (previously "Ceraria longipedunculata" or "Ceraria kaokoensis") is a small-leaved succulent plant found in the far north of Namibia and into southern Angola.
In botany, succulent plants, also known as succulents or sometimes water storage plants, are plants that have some parts that are more than normally thickened and fleshy, usually to retain water in arid climates or soil conditions.
 The word "succulent" comes from the Latin word "sucus", meaning juice, or sap.
 Succulent plants may store water in various structures, such as leaves and stems.
 Some definitions also include roots, so that geophytes that survive unfavorable periods by dying back to underground storage organs may be regarded as succulents.
 In horticultural use, the term "succulent" is often used in a way which excludes plants that botanists would regard as succulents, such as cacti.
 Succulents are often grown as ornamental plants because of their striking and unusual appearance.

Question: Which is a succulent, Portulacaria or Calamintha?
Answer: Portulacaria