Euphorbia sect. Monadenium - Wikispecies
Monadenium ritchiei
CAUDICIFORM Monadenium erubescens
Euphorbia monadenium stapelioides – Colorful Succulents
Monadenium lugardii 4" – Paradise Found Nursery
Monadenium guentheri - Cacti.com
Monadenium stapelioides variegated - YouTube
SHPR4399 Monadenium ritchiei f.variegata (Euphorbia ritchiei f.variegata) - Cactus-online
Monadenium stapelioides 4" – Paradise Found Nursery
Monadenium guentheri | The Cactus King
Monadenium ritchiei subs. nyambense
Monadenium Ritchiei Var. Nyambensis/ Clumping Succulent/ - Etsy
Monadenium (2017) - Henry Shaw Cactus and Succulent Society
Monadenium Ritchiei, Variegata, (Random) – Cedar Creek Farmhouse
Monadenium ritchiei
Monadenium guentheri | The Cactus King
