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It took me 9-10 photos of this form of E flanganii in my files to find a plant that did NOT have leaves like these... almost all the plants I have seen photos of leaves... most are a tad less leafy, or the leaves are smaller (these leaves on above plant are etiolated and most people expose their Euphorbias to more light so they are not so stressed). Anyway, here is a typical plant but the best close up I could find http://davesgarden.com/guides/pf/showimage/69337/
I agree that milky sap would be definative. I also blew this photo up 400% to try to determine if the cross section of the leaves was cylindrical as they would be in A. subulata and as I thought they were. They are not so flanganii is probably correct. I'll blame it on my old eyes... Sorry for taking up your time. Bill