The plants shown here are not cacti, even if you think they are – and also if they look like it.
Didierea trollii
Common name: Octopus Plant
Family: Didiereaceae
Origin: Madagascar
Duvalia pubescens
Common name: Carrion Flower
Family: Apocynaceae
Origin: South Africa
Euphorbia aeruginosa
Common name: Miniature Saguaro
Family: Euphorbiaceae
Origin: South Africa
Euphorbia ammak “Variegata”
Common name: African Candelabra
Family: Euphorbiaceae
Origin: The wild type is native to Jemen and Saudi Arabia.
Euphorbia canariensis
Common name: Canary Island Spurge
Family: Euphorbiaceae
Origin: Canary Islands
Euphorbia enopla
Common name: Pincushion Euphorbia
Family: Euphorbiaceae
Origin: South Africa
Euphorbia fimbriata
Common name: Spurge
Family: Euphorbiaceae
Origin: South Africa
Euphorbia fruticosa
Common name: Spurge
Family: Euphorbiaceae
Origin: Saudi Arabia, Yemen
Euphorbia franckiana
Common name: Spurge
Family: Euphorbiaceae
Origin: South Africa
Euphorbia horrida
Common name: African Milk Barrel
Family: Euphorbiaceae
Origin: South Africa
Euphorbia ingens
Common name: Candelabra Tree, Cactus Spurge, Cactus Euphorbia
Family: Euphorbiaceae
Origin: Tropical and subtropical Africa
Euphorbia jansenvillensis
Common name: Spurge
Family: Euphorbiaceae
Origin: South Africa
Euphorbia lactea
Common name: Candelabra-Cactus, Dragon-Bones
Family: Euphorbiaceae
Origin: India, Sri Lanka
Euphorbia mammillaris
Common name: Corkscrew, Corncob-Cactus
Family: Euphorbiaceae
Origin: South Africa
Euphorbia meloformis
Common name: Melon Spurge
Family: Euphorbiaceae
Origin: South Africa
Euphorbia obesa
Common name: Baseball Plant
Family: Euphorbiaceae
Origin: South Africa
Euphorbia pentagona
Common name: Spurge
Family: Euphorbiaceae
Origin: South Africa
Euphorbia polyacantha
Common name: Fish-Bone Euphorbia
Family: Euphorbiaceae
Origin: Eritrea, Ethiopia, Somalia, Sudan, Yemen
Euphorbia pseudocactus
Common name: Spurge
Family: Euphorbiaceae
Origin: South Africa
Euphorbia resinifera
Common name: Resin Spurge, African Spurge
Family: Euphorbiaceae
Origin: Morocco
Euphorbia ritchiei
Common name: Spurge
Family: Euphorbiaceae
Origin: Kenya
Euphorbia rowlandii
Common name: Levuvhu Euphorbia
Family: Euphorbiaceae
Origin: South Africa, Zimbabwe
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Euphorbia stellata
Common name: Spurge
Family: Euphorbiaceae
Origin: South Africa
Euphorbia submammillaris
Common name: Spurge
Family: Euphorbiaceae
Origin: South Africa
Euphorbia trigona
Common name: African Milk Tree, Cathedral Cactus, Abyssinian Euphorbia, High Chaparall
Family: Euphorbiaceae
Origin: Probably tropical and subtropical Africa.
Hoodia gordonii
Common name: Bushman’s Hat
Family: Asclepiadoideae
Origin: Namibia, South Africa
Huernia hystrix
Common name: Carrion Flower
Family: Asclepiadoideae
Origin: Mozambique, Zimbabwe, South Africa
Orbea semota
Common name: Carrion Flower
Family: Asclepiadoideae
Origin: Kenya, Namibia, South Africa
Pachypodium densiflorum
Common name: Madagascar Palm
Family: Apocynaceae
Origin: Madagascar
Pachypodium lamerei
Common name: Madagascar Palm
Family: Apocynaceae
Origin: Madagascar
Pachypodium namaquanum
Common name: Halfmens, Elephant’s Trunk
Family: Apocynaceae
Origin: Namibia, South Africa
Pachypodium saundersii
Common name: Kudu Kily
Family: Apocynaceae
Origin: Tropical Africa, South Africa
Sarcocaulon crassicaule
Common name: Bushman Candles
Family: Geraniaceae
Origin: South Africa