Its not fully polygona I can tell you that much. Ive looked up all the varieties, none of them seemed to mach completely. The peduncles/thorns are generally too short, or have more of them per section.
Ive found something under cereiformis, but I am m told as a species, cultivar, a lot of the data online is erroneous.
This is the best i could do.
Im not sure what you mean by whole plant btw. Its a solitary cactiform euphorbia about 13 cm tall and 5 cm wide(maximum). It is in my possession for a couple of weeks(bought before the pandemic was declared)
“Whenever people say, 'We mustn't be sentimental,' you can take it they are about to do something cruel. And if they add, 'We must be realistic,' they mean they are going to make money out of it.”
― Brigid Brophy
It reminds me quite a bit of a plant that used to be sold as Euphorbia horrida noorsveldensis. I had a couple, google it, and you will see a lot. However, it hardly matches what that plant is supposed to be. When I showed to a Euphorbia expert, he suspected it was E horrida x E heptagona. atteched is flower of mine earlier.