Here are some photos of the leaves on my Adeniums.

All of the Obesums (apart from two plants, details below) are like this...kind of oval shaped.

But, I have two Obesums that are different. The two plants germinated out of the same seed...they have leaves that have almost "flat" ends. The caudex part is different too - a rounded bulb shape at the base, then a thinner "neck". The skin pattern on the caudex looks different too, more defined, perhaps.

Then I have a few Somalense...long and pointy leaves, with a distinct silvery centre vein. Not the best photo, but the pointiness is obvious. :)

So I guess my question is - are the two in the middle photo just odd shaped Obesums...or are they another variety ?