While similar to the typical sandersonii this plant behaves very differently.

I've found that this plant flowers rarely, in contrast to typical which seems to always be in flower. 

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The leaf shape also varies between the two. The blue form has smaller, round leaves compared to the longer and wider typical form. The blue form leaves are also spread out further on the tendrils.

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Lastly, I've noticed that the blue form tends to send out longer tendrils, compared to the typical form, that like to invade other pots.