Yes, this is a Monadenium.
It looks close to M. guentheri but might be of related species as well. For a closer ID one hase to examine the cyathia.

Frank
www.euphorbia.de

Total rookie guess here, but could it be heteropodum?

Kim

Thanks frank and Kim... I tried to take a better look, however I had problems with focus... I need to learn how to use my camera, hoepfully by the time it decides to bloom again.