This plant is not E. didieroides, based on the cyathia, which should be much more numerous (dozens per cyme), a different color (yellow-green to orange), and with smaller, erect cyathophylls about the size of the glands. It also branches differently and has different spines.
The plant pictured is another one of the Madagascar Euphorbias, but I could not say which one at this point.
I will propose this image be moved to the genus entry for Euphorbia, unless anyone has input which may help with the identification. This is not the first time this bot garden has misidentified a succulent.
