Ok! I'm sticking with E. acrurensis. I looked it up in the Euphorbia #1 book. Page 50 has a plant called E. abyssinica and page 51 has E. acrurensis. So, even though davesgarden has them as synonyms of the same plant the Euphorbia book has them as two different plants.
I'm pretty sure E acrurensis has 3 to 4 ridges but no more than 4 (?) while E. abyssinica is multi ridged. 6 to 8 or more.
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